Module: Processing::GraphicsContext

Included in:
Context, Graphics
Defined in:
lib/processing/graphics_context.rb

Overview

Drawing context

Constant Summary collapse

PI =

PI

Math::PI
HALF_PI =

PI / 2

PI / 2
QUARTER_PI =

PI / 4

PI / 4
TWO_PI =

PI * 2

PI * 2
TAU =

PI * 2

PI * 2
PROCESSING =

Processing mode for renderMode().

:processing
P5JS =

p5.js mode for renderMode().

:p5js
RGBA =

RGBA format for createImage().

:rgba
RGB =

RGB format for createImage, or RGB mode for colorMode().

:rgb
HSB =

HSB mode for colorMode().

:hsb
RADIANS =

Radian mode for angleMode().

:radians
DEGREES =

Degree mode for angleMode().

:degrees
CORNER =

Mode for rectMode(), ellipseMode(), imageMode(), and shapeMode().

:corner
CORNERS =

Mode for rectMode(), ellipseMode(), imageMode(), and shapeMode().

:corners
CENTER =

Mode for rectMode(), ellipseMode(), imageMode(), shapeMode(), and textAlign().

:center
RADIUS =

Mode for rectMode() and ellipseMode().

:radius
PROJECT =

Mode for strokeCap().

:square
MITER =

Mode for strokeJoin().

:miter
ROUND =

Mode for strokeCap() and strokeJoin().

:round
SQUARE =

Mode for strokeCap() and strokeJoin().

:butt
BLEND =

Mode for blendMode().

:normal
ADD =

Mode for blendMode().

:add
SUBTRACT =

Mode for blendMode().

:subtract
LIGHTEST =

Mode for blendMode().

:lightest
DARKEST =

Mode for blendMode().

:darkest
EXCLUSION =

Mode for blendMode().

:exclusion
MULTIPLY =

Mode for blendMode().

:multiply
SCREEN =

Mode for blendMode().

:screen
REPLACE =

Mode for blendMode().

:replace
LEFT =

Key code or Mode for textAlign().

:left
RIGHT =

Key code or Mode for textAlign().

:right
TOP =

Mode for textAlign().

:top
BOTTOM =

Mode for textAlign().

:bottom
BASELINE =

Mode for textAlign().

:baseline
IMAGE =

Mode for textureMode().

:image
NORMAL =

Mode for textureMode().

:normal
CLAMP =

Mode for textureWrap().

:clamp
REPEAT =

Mode for textureWrap().

:repeat
THRESHOLD =

Filter type for filter()

:threshold
GRAY =

Filter type for filter()

:gray
INVERT =

Filter type for filter()

:invert
BLUR =

Filter type for filter()

:blur
LINE =

Shape mode for createShape()

:line
RECT =

Shape mode for createShape()

:rect
ELLIPSE =

Shape mode for createShape()

:ellipse
ARC =

Shape mode for createShape()

:arc
TRIANGLE =

Shape mode for createShape()

:triangle
QUAD =

Shape mode for createShape()

:quad
GROUP =

Shape mode for createShape()

:group
POINTS =

Shape mode for beginShape()

:points
LINES =

Shape mode for beginShape()

:lines
TRIANGLES =

Shape mode for beginShape()

:triangles
TRIANGLE_FAN =

Shape mode for beginShape()

:triangle_fan
TRIANGLE_STRIP =

Shape mode for beginShape()

:triangle_strip
QUADS =

Shape mode for beginShape()

:quads
QUAD_STRIP =

Shape mode for beginShape()

:quad_strip
TESS =

Shape mode for beginShape()

:tess
OPEN =

OPEN flag for endShape()

:open
CLOSE =

CLOSE flag for endShape()

:close
ENTER =

Key codes.

:enter
SPACE = 
:space
TAB = 
:tab
DELETE = 
:delete
BACKSPACE = 
:backspace
ESC = 
:escape
HOME = 
:home
PAGEUP =

END = :end

:pageup
PAGEDOWN = 
:pagedown
CLEAR = 
:clear
SHIFT = 
:shift
CONTROL = 
:control
ALT = 
:alt
WIN = 
:win
COMMAND = 
:command
OPTION = 
:option
FUNCTION = 
:function
CAPSLOCK = 
:capslock
SECTION = 
:section
HELP = 
:help
F1 = 
:f1
F2 = 
:f2
F3 = 
:f3
F4 = 
:f4
F5 = 
:f5
F6 = 
:f6
F7 = 
:f7
F8 = 
:f8
F9 = 
:f9
F10 = 
:f10
F11 = 
:f11
F12 = 
:f12
F13 = 
:f13
F14 = 
:f14
F15 = 
:f15
F16 = 
:f16
F17 = 
:f17
F18 = 
:f18
F19 = 
:f19
F20 = 
:f20
F21 = 
:f21
F22 = 
:f22
F23 = 
:f23
F24 = 
:f24
UP = 
:up
DOWN = 
:down

Instance Method Summary collapse

Instance Method Details

#abs(value) ⇒ Numeric

Returns the absolute number of the value.

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# File 'lib/processing/graphics_context.rb', line 2322

def abs(value)
  value.abs
end

#acos(value) ⇒ Numeric

Returns the inverse of cos().

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# File 'lib/processing/graphics_context.rb', line 2693

def acos(value)
  Math.acos value
end

#alpha(color) ⇒ Numeric

Returns the red value of the color.

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# File 'lib/processing/graphics_context.rb', line 586

def alpha(color)
  ((color >> 24) & 0xff) / 255.0 * @colorMaxes__[3]
end

#angleMode(mode = nil) ⇒ RADIANS, DEGREES

Sets angle mode.

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# File 'lib/processing/graphics_context.rb', line 682

def angleMode(mode = nil)
  if mode != nil
    @angleMode__  = mode
    @toRad__, @toDeg__, @fromRad__, @fromDeg__ =
      case mode.downcase.to_sym
      when RADIANS then [1.0,      RAD2DEG__, 1.0,       DEG2RAD__]
      when DEGREES then [DEG2RAD__, 1.0,      RAD2DEG__, 1.0]
      else raise ArgumentError, "invalid angle mode: #{mode}"
      end
  end
  @angleMode__
end

#applyMatrix(array) ⇒ nil #applyMatrix(a, b, c, d, e, f) ⇒ nil #applyMatrix(a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p) ⇒ nil

Reset current transformation matrix with 2x3, or 4x4 matrix.

Raises:

  • (ArgumentError)

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# File 'lib/processing/graphics_context.rb', line 2123

def applyMatrix(*args)
  assertDrawing__
  args = args.first if args.first.kind_of?(Array)
  if args.size == 6
    a, b, c, d, e, f = args
    args = [
      a, b, 0, 0,
      c, d, 0, 0,
      0, 0, 1, 0,
      e, f, 0, 1
    ]
  end
  raise ArgumentError unless args.size == 16
  m = Rays::Matrix.new(*args)
  m.transpose! if @p5jsMode__
  @painter__.matrix *= m
  nil
end

#arc(a, b, c, d, start, stop) ⇒ nil Also known as: drawArc

Draws an arc.

The parameters a, b, c, and d are determined by ellipseMode().

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# File 'lib/processing/graphics_context.rb', line 1436

def arc(a, b, c, d, start, stop)
  assertDrawing__
  x, y, w, h = toXYWH__ @ellipseMode__, a, b, c, d
  from, to   = toDegrees__(-start), toDegrees__(-stop)
  @painter__.ellipse x, y, w, h, from: from, to: to
  nil
end

#asin(value) ⇒ Numeric

Returns the inverse of sin().

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# File 'lib/processing/graphics_context.rb', line 2680

def asin(value)
  Math.asin value
end

#atan(value) ⇒ Numeric

Returns the inverse of tan().

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# File 'lib/processing/graphics_context.rb', line 2706

def atan(value)
  Math.atan value
end

#atan2(y, x) ⇒ Numeric

Returns the angle from a specified point.

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# File 'lib/processing/graphics_context.rb', line 2720

def atan2(y, x)
  Math.atan2 y, x
end

#background(str) ⇒ nil #background(str, alpha) ⇒ nil #background(gray) ⇒ nil #background(gray, alpha) ⇒ nil #background(r, g, b) ⇒ nil #background(r, g, b, alpha) ⇒ nil

Clears screen.

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# File 'lib/processing/graphics_context.rb', line 1286

def background(*args)
  assertDrawing__
  rgba = toRGBA__(*args)
  if rgba[3] == 1
    @painter__.background(*rgba)
  else
    @painter__.push fill: rgba, stroke: :none do |_|
      @painter__.rect 0, 0, width, height
    end
  end
  nil
end

#beginContour ⇒ nil

Begins drawing a hole inside shape.

Examples:

beginShape
vertex 10, 10
vertex 10, 50
vertex 50, 50
vertex 90, 10
beginContour
vertex 20, 20
vertex 30, 20
vertex 30, 30
vertex 20, 30
endContour
endShape CLOSE

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# File 'lib/processing/graphics_context.rb', line 1736

def beginContour()
  (@drawingShape__ or raise "beginContour() must be called after beginShape()")
    .beginContour
end

#beginShape(type = nil) ⇒ nil

Begins drawing complex shapes.

Examples:

# Draws polygon
beginShape
vertex 10, 10
vertex 10, 50
vertex 50, 50
vertex 90, 10
endShape CLOSE

# Draws triangles
beginShape TRIANGLES
vertex 10, 10
vertex 10, 50
vertex 50, 50
endShape

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# File 'lib/processing/graphics_context.rb', line 1690

def beginShape(type = nil)
  raise "beginShape() cannot be called twice" if @drawingShape__
  @drawingShape__ = createShape
  @drawingShape__.beginShape type
end

#bezier(x1, y1, cx1, cy1, cx2, cy2, x2, y2) ⇒ nil Also known as: drawBezier

Draws a Bezier spline curve.

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# File 'lib/processing/graphics_context.rb', line 1551

def bezier(x1, y1, cx1, cy1, cx2, cy2, x2, y2)
  assertDrawing__
  @painter__.nsegment = @bezierDetail__
  @painter__.bezier x1, y1, cx1, cy1, cx2, cy2, x2, y2
  @painter__.nsegment = 0
  nil
end

#bezierDetail(detail) ⇒ nil

Sets the resolution at which Bezier’s curve is displayed. The default value is 20.

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# File 'lib/processing/graphics_context.rb', line 975

def bezierDetail(detail)
  detail = 1 if detail < 1
  @bezierDetail__ = detail
  nil
end

#bezierPoint(a, b, c, d, t) ⇒ Numeric

Evaluates the Bezier at point t for points a, b, c, d.

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# File 'lib/processing/graphics_context.rb', line 2785

def bezierPoint(a, b, c, d, t)
  tt = 1.0 - t
  tt ** 3.0 * a +
  tt ** 2.0 * b * 3.0 * t +
  t  ** 2.0 * c * 3.0 * tt +
  t  ** 3.0 * d
end

#bezierTangent(a, b, c, d, t) ⇒ Numeric

Calculates the tangent of a point on a Bezier curve.

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# File 'lib/processing/graphics_context.rb', line 2806

def bezierTangent(a, b, c, d, t)
  tt = 1.0 - t
  3.0 * d * t  ** 2.0 -
  3.0 * c * t  ** 2.0 +
  6.0 * c * tt *  t   -
  6.0 * b * tt *  t   +
  3.0 * b * tt ** 2.0 -
  3.0 * a * tt ** 2.0
end

#bezierVertex(x2, y2, x3, y3, x4, y4) ⇒ nil

Append bezier vertex for shape polygon.

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# File 'lib/processing/graphics_context.rb', line 1798

def bezierVertex(x2, y2, x3, y3, x4, y4)
  (@drawingShape__ or raise "bezierVertex() must be called after beginShape()")
    .bezierVertex x2, y2, x3, y3, x4, y4
end

#blend(sx, sy, sw, sh, dx, dy, dw, dh, mode) ⇒ nil #blend(img, sx, sy, sw, sh, dx, dy, dw, dh, mode) ⇒ nil

Blends image.

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# File 'lib/processing/graphics_context.rb', line 1863

def blend(img = nil, sx, sy, sw, sh, dx, dy, dw, dh, mode)
  assertDrawing__
  (img || self).drawImage__(
    @painter__, sx, sy, sw, sh, dx, dy, dw, dh,
    fill: getTint__, stroke: :none, blend_mode: mode)
end

#blendMode(mode = nil) ⇒ nil

Sets blend mode. Default is BLEND.

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# File 'lib/processing/graphics_context.rb', line 804

def blendMode(mode = nil)
  if mode != nil
    @blendMode__          = mode
    @painter__.blend_mode = mode
  end
  @blendMode__
end

#blue(color) ⇒ Numeric

Returns the blue value of the color.

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# File 'lib/processing/graphics_context.rb', line 573

def blue(color)
  (color & 0xff) / 255.0 * @colorMaxes__[2]
end

#brightness(color) ⇒ Numeric

Returns the brightness value of the color.

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# File 'lib/processing/graphics_context.rb', line 627

def brightness(color)
  _, _, b = toRawColor__(color).to_hsv
  b * (@hsbColor__ ? @colorMaxes__[2] : 1)
end

#ceil(value) ⇒ Numeric

Returns the closest integer number greater than or equal to the value.

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# File 'lib/processing/graphics_context.rb', line 2335

def ceil(value)
  value.ceil
end

#circle(x, y, extent) ⇒ nil Also known as: drawCircle

Draws a circle.

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# File 'lib/processing/graphics_context.rb', line 1414

def circle(x, y, extent)
  ellipse x, y, extent, extent
end

#clear ⇒ Object 



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# File 'lib/processing/graphics_context.rb', line 1299

def clear()
  assertDrawing__
  @painter__.background 0, 0
  nil
end

#clip(a, b, c, d) ⇒ nil

Limits the drawable rectangle.

The parameters a, b, c, and d are determined by rectMode().

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# File 'lib/processing/graphics_context.rb', line 1037

def clip(a, b, c, d)
  x, y, w, h = toXYWH__ @imageMode__, a, b, c, d
  @painter__.clip x, y, w, h
  nil
end

#color(gray) ⇒ Integer #color(gray, alpha) ⇒ Integer #color(v1, v2, v3) ⇒ Integer #color(v1, v2, v3, alpha) ⇒ Integer

Creates color value.

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# File 'lib/processing/graphics_context.rb', line 532

def color(*args)
  toRGBA__(*args)
    .map {|n| (n * 255).to_i.clamp 0, 255}
    .then {|r, g, b, a| Image.toColor__ r, g, b, a}
end

#colorMode(mode) ⇒ RGB, HSB #colorMode(mode, max) ⇒ RGB, HSB #colorMode(mode, max1, max2, max3) ⇒ RGB, HSB #colorMode(mode, max1, max2, max3, maxA) ⇒ RGB, HSB

Sets color mode and max color values.

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# File 'lib/processing/graphics_context.rb', line 498

def colorMode(mode = nil, *maxes)
  if mode != nil
    mode = mode.downcase.to_sym
    raise ArgumentError, "invalid color mode: #{mode}" unless [RGB, HSB].include?(mode)
    raise ArgumentError unless [0, 1, 3, 4].include?(maxes.size)

    @colorMode__ = mode
    @hsbColor__  = mode == HSB
    case maxes.size
    when 1    then @colorMaxes__                 = [maxes.first.to_f] * 4
    when 3, 4 then @colorMaxes__[0...maxes.size] = maxes.map &:to_f
    end
  end
  @colorMode__
end

#constrain(value, min, max) ⇒ Numeric

Constrains the number between min..max.

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# File 'lib/processing/graphics_context.rb', line 2602

def constrain(value, min, max)
  value < min ? min : (value > max ? max : value)
end

#copy(sx, sy, sw, sh, dx, dy, dw, dh) ⇒ nil #copy(img, sx, sy, sw, sh, dx, dy, dw, dh) ⇒ nil

Copies image.

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# File 'lib/processing/graphics_context.rb', line 1838

def copy(img = nil, sx, sy, sw, sh, dx, dy, dw, dh)
  blend img, sx, sy, sw, sh, dx, dy, dw, dh, BLEND
end

#cos(angle) ⇒ Numeric

Returns the cosine of an angle.

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# File 'lib/processing/graphics_context.rb', line 2654

def cos(angle)
  Math.cos angle
end

#createCapture(*args) ⇒ Capture

Creates a camera object as a video input device.



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# File 'lib/processing/graphics_context.rb', line 3116

def createCapture(*args)
  Capture.new(*args)
end

#createFont(name, size) ⇒ Font

Creates a new font object.

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# File 'lib/processing/graphics_context.rb', line 2967

def createFont(name, size)
  size = FONT_SIZE_MAX__ if size && size > FONT_SIZE_MAX__
  Font.new Rays::Font.new(name, size || FONT_SIZE_DEFAULT__)
end

#createGraphics(width, height, pixelDensity = 1) ⇒ Graphics

Creates a new off-screen graphics context object.

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# File 'lib/processing/graphics_context.rb', line 3068

def createGraphics(width, height, pixelDensity = 1)
  Graphics.new width, height, pixelDensity
end

#createImage(w, h) ⇒ Image #createImage(w, h, format) ⇒ Image

Creates a new image object.

Raises:

  • (ArgumentError)

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# File 'lib/processing/graphics_context.rb', line 2986

def createImage(w, h, format = RGBA)
  colorspace = {RGB => Rays::RGB, RGBA => Rays::RGBA}[format]
  raise ArgumentError, "Unknown image format" unless colorspace
  Image.new Rays::Image.new(w, h, colorspace).paint {background 0, 0}
end

#createShader(vertPath, fragPath) ⇒ Shader #createShader(vertSource, fragSource) ⇒ Shader

Creates a shader object.

Passing nil for a vertex shader parameter causes the following default vertex shader to be used. “‘ attribute vec3 position; attribute vec3 texCoord; attribute vec4 color; varying vec4 vertPosition; varying vec4 vertTexCoord; varying vec4 vertColor; uniform mat4 transform; uniform mat4 texMatrix; void main () 

vec4 pos__   = vec4(position, 1.0);
vertPosition = pos__;
vertTexCoord = texMatrix * vec4(texCoord, 1.0);
vertColor    = color;
gl_Position  = transform * pos__;

“‘

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# File 'lib/processing/graphics_context.rb', line 3106

def createShader(vert, frag)
  vert = File.read if vert && File.exist?(vert)
  frag = File.read if frag && File.exist?(frag)
  Shader.new vert, frag
end

#createShape ⇒ Shape #createShape(LINE, x1, y1, x2, y2) ⇒ Shape #createShape(RECT, a, b, c, d) ⇒ Shape #createShape(ELLIPSE, a, b, c, d) ⇒ Shape #createShape(ARC, a, b, c, d, start, stop) ⇒ Shape #createShape(TRIANGLE, x1, y1, x2, y2, x3, y3) ⇒ Shape #createShape(QUAD, x1, y1, x2, y2, x3, y3, x4, y4) ⇒ Shape #createShape(GROUP) ⇒ Shape

Creates a new shape object.

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# File 'lib/processing/graphics_context.rb', line 3009

def createShape(kind = nil, *args)
  case kind
  when LINE     then createLineShape__(    *args)
  when RECT     then createRectShape__(    *args)
  when ELLIPSE  then createEllipseShape__( *args)
  when ARC      then createArcShape__(     *args)
  when TRIANGLE then createTriangleShape__(*args)
  when QUAD     then createQuadShape__(    *args)
  when GROUP    then Shape.new nil, [], context: self
  when nil      then Shape.new context: self
  else raise ArgumentError, "Unknown shape kind '#{kind}'"
  end
end

#createVector ⇒ Vector #createVector(x, y) ⇒ Vector #createVector(x, y, z) ⇒ Vector

Creates a new vector object.

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# File 'lib/processing/graphics_context.rb', line 2954

def createVector(*args)
  Vector.new(*args, context: self)
end

#curve(cx1, cy1, x1, y1, x2, y2, cx2, cy2) ⇒ nil Also known as: drawCurve

Draws a Catmull-Rom spline curve.

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# File 'lib/processing/graphics_context.rb', line 1525

def curve(cx1, cy1, x1, y1, x2, y2, cx2, cy2)
  assertDrawing__
  @painter__.nsegment = @curveDetail__
  @painter__.curve cx1, cy1, x1, y1, x2, y2, cx2, cy2
  @painter__.nsegment = 0
  nil
end

#curveDetail(detail) ⇒ nil

Sets the resolution at which curves display. The default value is 20 while the minimum value is 3.

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# File 'lib/processing/graphics_context.rb', line 945

def curveDetail(detail)
  detail = 3 if detail < 3
  @curveDetail__ = detail
  nil
end

#curvePoint(a, b, c, d, t) ⇒ Numeric

Evaluates the curve at point t for points a, b, c, d.

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# File 'lib/processing/graphics_context.rb', line 2737

def curvePoint(a, b, c, d, t)
  s  = @curveTightness__
  t3 = t * t * t
  t2 = t * t
  f1 = ( s - 1.0) / 2.0 * t3 + ( 1.0 - s)       * t2 + (s - 1.0) / 2.0 * t
  f2 = ( s + 3.0) / 2.0 * t3 + (-5.0 - s) / 2.0 * t2 +  1.0
  f3 = (-3.0 - s) / 2.0 * t3 + ( s + 2.0)       * t2 + (1.0 - s) / 2.0 * t
  f4 = ( 1.0 - s) / 2.0 * t3 + ( s - 1.0) / 2.0 * t2
  a * f1 + b * f2 + c * f3 + d * f4
end

#curveTangent(a, b, c, d, t) ⇒ Numeric

Calculates the tangent of a point on a curve.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2761

def curveTangent(a, b, c, d, t)
  s = @curveTightness__
  tt3 = t * t * 3.0
  t2  = t * 2.0
  f1  = ( s - 1.0) / 2.0 * tt3 + ( 1.0 - s)       * t2 + (s - 1.0) / 2.0
  f2  = ( s + 3.0) / 2.0 * tt3 + (-5.0 - s) / 2.0 * t2
  f3  = (-3.0 - s) / 2.0 * tt3 + ( s + 2.0)       * t2 + (1.0 - s) / 2.0
  f4  = ( 1.0 - s) / 2.0 * tt3 + ( s - 1.0) / 2.0 * t2
  a * f1 + b * f2 + c * f3 + d * f4
end

#curveTightness(tightness) ⇒ nil

Sets the quality of curve forms.

See Also:



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# File 'lib/processing/graphics_context.rb', line 960

def curveTightness(tightness)
  @curveTightness__ = tightness
  nil
end

#curveVertex(x, y) ⇒ nil

Append curve vertex for shape polygon.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1783

def curveVertex(x, y)
  (@drawingShape__ or raise "curveVertex() must be called after beginShape()")
    .curveVertex x, y
end

#degrees(radian) ⇒ Numeric

Converts radian to degree.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2628

def degrees(radian)
  radian * RAD2DEG__
end

#dist(x1, y1, x2, y2) ⇒ Numeric #dist(x1, y1, z1, x2, y2, z2) ⇒ Numeric

Returns distance between 2 points.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2471

def dist(*args)
  case args.size
  when 4
    x1, y1, x2, y2 = *args
    xx, yy = x2 - x1, y2 - y1
    Math.sqrt xx * xx + yy * yy
  when 3
    x1, y1, z1, x2, y2, z2 = *args
    xx, yy, zz = x2 - x1, y2 - y1, z2 - z1
    Math.sqrt xx * xx + yy * yy + zz * zz
  else raise ArgumentError
  end
end

#ellipse(a, b, c, d) ⇒ nil Also known as: drawEllipse

Draws an ellipse.

The parameters a, b, c, and d are determined by ellipseMode().

See Also:



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# File 'lib/processing/graphics_context.rb', line 1394

def ellipse(a, b, c, d)
  assertDrawing__
  x, y, w, h = toXYWH__ @ellipseMode__, a, b, c, d
  @painter__.ellipse x, y, w, h
  nil
end

#ellipseMode(mode) ⇒ nil

Sets ellipse mode. Default is CENTER.

CORNER -> ellipse(left, top, width, height) CORNERS -> ellipse(left, top, right, bottom) CENTER -> ellipse(centerX, centerY, width, height) RADIUS -> ellipse(centerX, centerY, radiusH, radiusV)

See Also:



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# File 'lib/processing/graphics_context.rb', line 747

def ellipseMode(mode)
  @ellipseMode__ = mode
end

#endContour ⇒ nil

Ends drawing a hole.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1748

def endContour()
  (@drawingShape__ or raise "endContour() must be called after beginShape()")
    .endContour
end

#endShape ⇒ nil #endShape(CLOSE) ⇒ nil

Ends drawing complex shapes.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1707

def endShape(mode = nil)
  s = @drawingShape__ or raise "endShape() must be called after beginShape()"
  s.endShape mode
  shape s
  @drawingShape__ = nil
  nil
end

#exp(n) ⇒ Numeric

Returns Euler’s number e raised to the power of value.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2387

def exp(n)
  Math.exp n
end

#fill(rgb) ⇒ nil #fill(rgb, alpha) ⇒ nil #fill(gray) ⇒ nil #fill(gray, alpha) ⇒ nil #fill(r, g, b) ⇒ nil #fill(r, g, b, alpha) ⇒ nil

Sets fill color.

See Also:



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# File 'lib/processing/graphics_context.rb', line 833

def fill(*args)
  @painter__.fill(*toRGBA__(*args))
  nil
end

#filter(*args) ⇒ nil

Applies an image filter to screen.

overload filter(shader) overload filter(type) overload filter(type, param)

See Also:



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# File 'lib/processing/graphics_context.rb', line 1260

def filter(*args)
  @filter__ = Shader.createFilter__(*args)
  nil
end

#floor(value) ⇒ Numeric

Returns the closest integer number less than or equal to the value.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2348

def floor(value)
  value.floor
end

#green(color) ⇒ Numeric

Returns the green value of the color.

See Also:



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# File 'lib/processing/graphics_context.rb', line 560

def green(color)
  ((color >> 8) & 0xff) / 255.0 * @colorMaxes__[1]
end

#height ⇒ Numeric

Returns the height of the graphics object.

See Also:



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# File 'lib/processing/graphics_context.rb', line 430

def height()
  getInternal__.height
end

#hue(color) ⇒ Numeric

Returns the hue value of the color.

See Also:



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# File 'lib/processing/graphics_context.rb', line 599

def hue(color)
  h, = toRawColor__(color).to_hsv
  h * (@hsbColor__ ? @colorMaxes__[0] : 1)
end

#image(img, a, b) ⇒ nil #image(img, a, b, c, d) ⇒ nil Also known as: drawImage

Draws an image.

The parameters a, b, c, and d are determined by imageMode().

See Also:



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# File 'lib/processing/graphics_context.rb', line 1623

def image(img, a, b, c = nil, d = nil)
  assertDrawing__
  x, y, w, h = toXYWH__ @imageMode__, a, b, c || img.width, d || img.height
  img.drawImage__ @painter__, x, y, w, h, fill: getTint__, stroke: :none
  nil
end

#imageMode(mode) ⇒ nil

Sets image mode. Default is CORNER.

CORNER -> image(img, left, top, width, height) CORNERS -> image(img, left, top, right, bottom) CENTER -> image(img, centerX, centerY, width, height)

See Also:



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# File 'lib/processing/graphics_context.rb', line 764

def imageMode(mode)
  @imageMode__ = mode
end

#lerp(start, stop, amount) ⇒ Numeric

Returns the interpolated number between range start..stop.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2511

def lerp(start, stop, amount)
  start + (stop - start) * amount
end

#lerpColor(color1, color2, amount) ⇒ Integer

Returns the interpolated color between color1 and color2.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2526

def lerpColor(color1, color2, amount)
  color(
    lerp(red(  color1), red(  color2), amount),
    lerp(green(color1), green(color2), amount),
    lerp(blue( color1), blue( color2), amount),
    lerp(alpha(color1), alpha(color2), amount))
end

#line(x1, y1, x2, y2) ⇒ nil Also known as: drawLine

Draws a line.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1335

def line(x1, y1, x2, y2)
  assertDrawing__
  @painter__.line x1, y1, x2, y2
  nil
end

#loadFont(filename) ⇒ Font

Loads font from file.

See Also:



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# File 'lib/processing/graphics_context.rb', line 3129

def loadFont(filename)
  ext = File.extname filename
  raise "unsupported font type -- '#{ext}'" unless ext =~ /^\.?(ttf|otf)$/i

  filename = httpGet__ filename, ext if filename =~ %r|^https?://|
  Font.new Rays::Font.load filename
end

#loadImage(filename, extension = nil) ⇒ Image

Loads image.

See Also:



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# File 'lib/processing/graphics_context.rb', line 3147

def loadImage(filename, extension = nil)
  ext = extension || File.extname(filename)
  raise "unsupported image type -- '#{ext}'" unless ext =~ /^\.?(png|jpg|gif)$/i

  filename = httpGet__ filename, ext if filename =~ %r|^https?://|
  Image.new Rays::Image.load filename
end

#loadPixels ⇒ nil

Loads all pixels to the ‘pixels’ array.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1877

def loadPixels()
  @pixels__ = getInternal__.pixels
end

#loadShader(fragPath) ⇒ Shader #loadShader(fragPath, vertPath) ⇒ Shader

Loads shader file.

See Also:



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# File 'lib/processing/graphics_context.rb', line 3190

def loadShader(fragPath, vertPath = nil)
  createShader vertPath, fragPath
end

#log(n) ⇒ Numeric

Returns the natural logarithm (the base-e logarithm) of a number.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2374

def log(n)
  Math.log n
end

#mag(x, y) ⇒ Numeric #mag(x, y, z) ⇒ Numeric

Returns the magnitude (or length) of a vector.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2445

def mag(*args)
  x, y, z = *args
  case args.size
  when 2 then Math.sqrt x * x + y * y
  when 3 then Math.sqrt x * x + y * y + z * z
  else raise ArgumentError
  end
end

#map(value, start1, stop1, start2, stop2) ⇒ Numeric

Maps a number from range start1..stop1 to range start2..stop2.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2547

def map(value, start1, stop1, start2, stop2)
  lerp start2, stop2, norm(value, start1, stop1)
end

#max(a, b) ⇒ Numeric #max(a, b, c) ⇒ Numeric #max(array) ⇒ Numeric

Returns maximum value.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2587

def max(*args)
  args.flatten.max
end

#min(a, b) ⇒ Numeric #min(a, b, c) ⇒ Numeric #min(array) ⇒ Numeric

Returns minimum value.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2567

def min(*args)
  args.flatten.min
end

#noClip ⇒ nil

Disables clipping.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1049

def noClip()
  @painter__.no_clip
  nil
end

#noFill ⇒ nil

Disables filling.

See Also:



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# File 'lib/processing/graphics_context.rb', line 850

def noFill()
  @painter__.fill nil
  nil
end

#noise(x) ⇒ Numeric #noise(x, y) ⇒ Numeric #noise(x, y, z) ⇒ Numeric

Returns the perlin noise value.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2831

def noise(x, y = 0, z = 0)
  seed, falloff = @noiseSeed__, @noiseFallOff__
  amp           = 0.5
  @noiseOctaves__.times.reduce(0) do |sum|
    value = (Rays.perlin(x, y, z, seed) / 2.0 + 0.5) * amp
    x    *= 2
    y    *= 2
    z    *= 2
    amp  *= falloff
    sum + value
  end
end

#noiseDetail(lod, falloff = nil) ⇒ nil

Adjusts the character and level of detail produced by the Perlin noise function.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2867

def noiseDetail(lod, falloff = nil)
  @noiseOctaves__ = lod     if lod     && lod > 0
  @noiseFallOff__ = falloff if falloff && falloff > 0
end

#noiseSeed(seed) ⇒ nil

Sets the seed value for noise()

See Also:



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# File 'lib/processing/graphics_context.rb', line 2853

def noiseSeed(seed)
  @noiseSeed__ = Random.new(seed).rand 0.0..1.0
end

#norm(value, start, stop) ⇒ Numeric

Normalize the value from range start..stop into 0..1.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2496

def norm(value, start, stop)
  (value.to_f - start.to_f) / (stop.to_f - start.to_f)
end

#noStroke ⇒ nil

Disables drawing stroke.

See Also:



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# File 'lib/processing/graphics_context.rb', line 888

def noStroke()
  @painter__.stroke nil
  nil
end

#noTint ⇒ nil

Resets tint color.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1014

def noTint()
  @tint__ = nil
end

#pixelDensity ⇒ Numeric

Returns the pixel density of the graphics object.

See Also:



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# File 'lib/processing/graphics_context.rb', line 461

def pixelDensity()
  @painter__.pixel_density
end

#pixelHeight ⇒ Numeric

Returns the height of the graphics object in pixels.

See Also:



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# File 'lib/processing/graphics_context.rb', line 450

def pixelHeight()
  height * pixelDensity
end

#pixels ⇒ Array

An array of all pixels. Call loadPixels() before accessing the array.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1909

def pixels()
  @pixels__
end

#pixelWidth ⇒ Numeric

Returns the width of the graphics object in pixels.

See Also:



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# File 'lib/processing/graphics_context.rb', line 440

def pixelWidth()
  width * pixelDensity
end

#point(x, y) ⇒ nil Also known as: drawPoint

Draws a point.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1315

def point(x, y)
  assertDrawing__
  @painter__.point x, y
  nil
end

#pop ⇒ nil

Restore styles and transformations from stack.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2286

def pop()
  popMatrix
  popStyle
end

#popMatrix ⇒ nil

Pops the current transformation matrix from stack.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2087

def popMatrix()
  assertDrawing__
  raise "matrix stack underflow" if @matrixStack__.empty?
  @painter__.matrix = @matrixStack__.pop
  nil
end

#popStyle ⇒ nil

Restore style values from the style stack.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2223

def popStyle()
  assertDrawing__
  raise "style stack underflow" if @styleStack__.empty?
  @painter__.fill,
  @painter__.stroke,
  @painter__.stroke_width,
  @painter__.stroke_cap,
  @painter__.stroke_join,
  @painter__.miter_limit,
  @painter__.line_height,
  @painter__.clip,
  @painter__.blend_mode,
  @painter__.font,
  @painter__.texture,
  @painter__.texcoord_mode,
  @painter__.texcoord_wrap,
  @painter__.shader,
  @colorMode__,
  @hsbColor__,
  @colorMaxes__,
  @angleMode__,
  @toRad__,
  @toDeg__,
  @fromRad__,
  @fromDeg__,
  @rectMode__,
  @ellipseMode__,
  @imageMode__,
  @shapeMode__,
  @blendMode__,
  @curveDetail__,
  @curveTightness__,
  @bezierDetail__,
  @textAlignH__,
  @textAlignV__,
  @textFont__,
  @tint__ = @styleStack__.pop
  @textFont__.setSize__ @painter__.font.size
  nil
end

#pow(value, exponent) ⇒ Numeric

Returns value raised to the power of exponent.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2401

def pow(value, exponent)
  value ** exponent
end

#printMatrix ⇒ nil

Prints matrix elements to console.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2161

def printMatrix()
  m = @painter__.matrix
  m.transpose! if @p5jsMode__
  print "%f %f %f %f\n%f %f %f %f\n%f %f %f %f\n%f %f %f %f\n" % m.to_a
  nil
end

#push(&block) ⇒ Object

Save current styles and transformations to stack.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2271

def push(&block)
  pushMatrix
  pushStyle
  block.call if block
ensure
  pop if block
end

#pushMatrix(&block) ⇒ Object

Pushes the current transformation matrix to stack.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2073

def pushMatrix(&block)
  assertDrawing__
  @matrixStack__.push @painter__.matrix
  block.call if block
ensure
  popMatrix if block
end

#pushStyle(&block) ⇒ Object

Save current style values to the style stack.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2174

def pushStyle(&block)
  assertDrawing__
  @styleStack__.push [
    @painter__.fill,
    @painter__.stroke,
    @painter__.stroke_width,
    @painter__.stroke_cap,
    @painter__.stroke_join,
    @painter__.miter_limit,
    @painter__.line_height!,
    @painter__.clip,
    @painter__.blend_mode,
    @painter__.font,
    @painter__.texture,
    @painter__.texcoord_mode,
    @painter__.texcoord_wrap,
    @painter__.shader,
    @colorMode__,
    @hsbColor__,
    @colorMaxes__,
    @angleMode__,
    @toRad__,
    @toDeg__,
    @fromRad__,
    @fromDeg__,
    @rectMode__,
    @ellipseMode__,
    @imageMode__,
    @shapeMode__,
    @blendMode__,
    @curveDetail__,
    @curveTightness__,
    @bezierDetail__,
    @textAlignH__,
    @textAlignV__,
    @textFont__,
    @tint__,
  ]
  block.call if block
ensure
  popStyle if block
end

#quad(x1, y1, x2, y2, x3, y3, x4, y4) ⇒ nil Also known as: drawQuad

Draws a quad.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1501

def quad(x1, y1, x2, y2, x3, y3, x4, y4)
  assertDrawing__
  @painter__.line x1, y1, x2, y2, x3, y3, x4, y4, loop: true
  nil
end

#quadraticVertex(cx, cy, x3, y3) ⇒ nil

Append quadratic vertex for shape polygon.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1813

def quadraticVertex(cx, cy, x3, y3)
  (@drawingShape__ or raise "quadraticVertex() must be called after beginShape()")
    .quadraticVertex cx, cy, x3, y3
end

#radians(degree) ⇒ Numeric

Converts degree to radian.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2615

def radians(degree)
  degree * DEG2RAD__
end

#random(high) ⇒ Float #random(low, high) ⇒ Float #random(choices) ⇒ Float

Returns a random number in range low…high

See Also:



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# File 'lib/processing/graphics_context.rb', line 2887

def random(*args)
  if args.first.kind_of? Array
    a = args.first
    a.empty? ? nil : a[@random__.rand a.size]
  else
    high, low = args.reverse
    @random__.rand (low || 0).to_f...(high || 1).to_f
  end
end

#randomGaussian(mean = 0, sd = 1) ⇒ Float

Returns a random number fitting a Gaussian, or normal, distribution.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2921

def randomGaussian(mean = 0, sd = 1)
  value =
    if @nextGaussian__
      x, @nextGaussian__ = @nextGaussian__, nil
      x
    else
      a, b, w = 0, 0, 1
      until w < 1
        a = random(2) - 1
        b = random(2) - 1
        w = a ** 2 + b ** 2
      end
      w = Math.sqrt(-2 * Math.log(w) / w)
      @randomGaussian__ = a * w
      b * w
    end
  value * sd + mean
end

#randomSeed(seed) ⇒ nil

Sets the seed value for random()

See Also:



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# File 'lib/processing/graphics_context.rb', line 2906

def randomSeed(seed)
  @random__       = Random.new seed
  @nextGaussian__ = nil
end

#rect(a, b, c, d) ⇒ nil #rect(a, b, c, d, r) ⇒ nil #rect(a, b, c, d, tl, tr, br, bl) ⇒ nil Also known as: drawRect

Draws a rectangle.

The parameters a, b, c, and d are determined by rectMode().

See Also:



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# File 'lib/processing/graphics_context.rb', line 1366

def rect(a, b, c, d, *args)
  assertDrawing__
  x, y, w, h = toXYWH__ @rectMode__, a, b, c, d
  case args.size
  when 0 then @painter__.rect x, y, w, h
  when 1 then @painter__.rect x, y, w, h, round: args[0]
  when 4 then @painter__.rect x, y, w, h, lt: args[0], rt: args[1], rb: args[2], lb: args[3]
  else raise ArgumentError # ToDo: refine error message
  end
  nil
end

#rectMode(mode) ⇒ nil

Sets rect mode. Default is CORNER.

CORNER -> rect(left, top, width, height) CORNERS -> rect(left, top, right, bottom) CENTER -> rect(centerX, centerY, width, height) RADIUS -> rect(centerX, centerY, radiusH, radiusV)

See Also:



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# File 'lib/processing/graphics_context.rb', line 729

def rectMode(mode)
  @rectMode__ = mode
end

#red(color) ⇒ Numeric

Returns the red value of the color.

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# File 'lib/processing/graphics_context.rb', line 547

def red(color)
  ((color >> 16) & 0xff) / 255.0 * @colorMaxes__[0]
end

#renderMode(mode = nil) ⇒ PROCESSING, P5JS

Sets render mode.



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# File 'lib/processing/graphics_context.rb', line 471

def renderMode(mode = nil)
  if mode
    @renderMode__ = mode
    @p5jsMode__   = mode == P5JS
  end
  @renderMode__
end

#requestImage(filename, extension = nil) ⇒ Image

Loads image on a new thread. When the image is loading, its width and height will be 0. If an error occurs while loading the image, its width and height wil be -1.

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# File 'lib/processing/graphics_context.rb', line 3166

def requestImage(filename, extension = nil)
  img = Image.new nil
  Thread.new filename, extension do |fn, ext|
    loaded = loadImage(fn, ext) or raise
    img.setInternal__ loaded.getInternal__
  rescue
    img.setInternal__ nil, true
  end
  img
end

#resetMatrix ⇒ nil

Reset current transformation matrix with identity matrix.

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# File 'lib/processing/graphics_context.rb', line 2149

def resetMatrix()
  assertDrawing__
  @painter__.matrix = 1
  nil
end

#resetShader ⇒ nil

Resets shader.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1240

def resetShader()
  @painter__.no_shader
  nil
end

#rotate(angle) ⇒ nil

Applies rotation matrix to current transformation matrix.

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# File 'lib/processing/graphics_context.rb', line 1978

def rotate(angle)
  assertDrawing__
  @painter__.rotate toDegrees__ angle
  nil
end

#rotateX(angle) ⇒ nil

Applies rotation around the x-axis.

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# File 'lib/processing/graphics_context.rb', line 1993

def rotateX(angle)
  assertDrawing__
  @painter__.rotate toDegrees__(angle), 1, 0, 0
  nil
end

#rotateY(angle) ⇒ nil

Applies rotation around the y-axis.

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# File 'lib/processing/graphics_context.rb', line 2008

def rotateY(angle)
  assertDrawing__
  @painter__.rotate toDegrees__(angle), 0, 1, 0
  nil
end

#rotateZ(angle) ⇒ nil

Applies rotation around the z-axis.

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# File 'lib/processing/graphics_context.rb', line 2023

def rotateZ(angle)
  assertDrawing__
  @painter__.rotate toDegrees__(angle), 0, 0, 1
  nil
end

#round(value) ⇒ Numeric

Returns the closest integer number.

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# File 'lib/processing/graphics_context.rb', line 2361

def round(value)
  value.round
end

#saturation(color) ⇒ Numeric

Returns the saturation value of the color.

See Also:



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# File 'lib/processing/graphics_context.rb', line 613

def saturation(color)
  _, s, = toRawColor__(color).to_hsv
  s * (@hsbColor__ ? @colorMaxes__[1] : 1)
end

#save(filename) ⇒ nil

Saves screen image to file.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1922

def save(filename)
  getInternal__.save filename
  nil
end

#scale(s) ⇒ nil #scale(x, y) ⇒ nil #scale(x, y, z) ⇒ nil

Applies scale matrix to current transformation matrix.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1963

def scale(x, y = nil, z = 1)
  assertDrawing__
  @painter__.scale x, (y || x), z
  nil
end

#shader(shader) ⇒ nil

Sets shader.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1228

def shader(shader)
  @painter__.shader shader&.getInternal__
  nil
end

#shape(img, a, b) ⇒ nil #shape(img, a, b, c, d) ⇒ nil Also known as: drawShape

Draws a shape.

The parameters a, b, c, and d are determined by shapeMode().

See Also:



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# File 'lib/processing/graphics_context.rb', line 1649

def shape(shp, a = 0, b = 0, c = nil, d = nil)
  assertDrawing__
  return nil unless shp.isVisible

  drawWithTexture__ do |_|
    if c || d || @shapeMode__ != CORNER
      x, y, w, h = toXYWH__ @shapeMode__, a, b, c || shp.width, d || shp.height
      shp.draw__ @painter__, x, y, w, h
    else
      shp.draw__ @painter__, a, b
    end
  end
  nil
end

#shapeMode(mode) ⇒ nil

Sets shape mode. Default is CORNER.

CORNER -> shape(shp, left, top, width, height) CORNERS -> shape(shp, left, top, right, bottom) CENTER -> shape(shp, centerX, centerY, width, height)

See Also:



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# File 'lib/processing/graphics_context.rb', line 780

def shapeMode(mode)
  @shapeMode__ = mode
end

#shearX(angle) ⇒ nil

Applies shear around the x-axis.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2038

def shearX(angle)
  t = Math.tan toRadians__(angle)
  @painter__.matrix *= Rays::Matrix.new(
    1, t, 0, 0,
    0, 1, 0, 0,
    0, 0, 1, 0,
    0, 0, 0, 1)
  nil
end

#shearY(angle) ⇒ nil

Applies shear around the y-axis.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2057

def shearY(angle)
  t = Math.tan toRadians__(angle)
  @painter__.matrix *= Rays::Matrix.new(
    1, 0, 0, 0,
    t, 1, 0, 0,
    0, 0, 1, 0,
    0, 0, 0, 1)
  nil
end

#sin(angle) ⇒ Numeric

Returns the sine of an angle.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2641

def sin(angle)
  Math.sin angle
end

#sq(value) ⇒ Numeric

Returns squared value.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2414

def sq(value)
  value * value
end

#sqrt(value) ⇒ Numeric

Returns squared value.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2427

def sqrt(value)
  Math.sqrt value
end

#square(x, y, extent) ⇒ nil Also known as: drawSquare

Draws a square.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1457

def square(x, y, extent)
  rect x, y, extent, extent
end

#stroke(rgb) ⇒ nil #stroke(rgb, alpha) ⇒ nil #stroke(gray) ⇒ nil #stroke(gray, alpha) ⇒ nil #stroke(r, g, b) ⇒ nil #stroke(r, g, b, alpha) ⇒ nil

Sets stroke color.

See Also:



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# File 'lib/processing/graphics_context.rb', line 876

def stroke(*args)
  @painter__.stroke(*toRGBA__(*args))
  nil
end

#strokeCap(cap) ⇒ nil

Sets stroke cap mode.

See Also:



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# File 'lib/processing/graphics_context.rb', line 916

def strokeCap(cap)
  @painter__.stroke_cap cap
  nil
end

#strokeJoin(join) ⇒ nil

Sets stroke join mode.

See Also:



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# File 'lib/processing/graphics_context.rb', line 930

def strokeJoin(join)
  @painter__.stroke_join join
  nil
end

#strokeWeight(weight) ⇒ nil

Sets stroke weight.

See Also:



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# File 'lib/processing/graphics_context.rb', line 902

def strokeWeight(weight)
  @painter__.stroke_width weight
  nil
end

#tan(angle) ⇒ Numeric

Returns the ratio of the sine and cosine of an angle.

See Also:



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# File 'lib/processing/graphics_context.rb', line 2667

def tan(angle)
  Math.tan angle
end

#text(str) ⇒ nil #text(str, x, y) ⇒ nil #text(str, a, b, c, d) ⇒ nil Also known as: drawText

Draws a text.

The parameters a, b, c, and d are determined by rectMode().

See Also:



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# File 'lib/processing/graphics_context.rb', line 1582

def text(str, x, y, x2 = nil, y2 = nil)
  assertDrawing__
  if x2
    raise ArgumentError, "missing y2 parameter" unless y2
    x, y, w, h = toXYWH__ @rectMode__, x, y, x2, y2
    case @textAlignH__
    when RIGHT  then x +=  w - @painter__.font.width(str)
    when CENTER then x += (w - @painter__.font.width(str)) / 2
    end
    case @textAlignV__
    when BOTTOM then y +=  h - @painter__.font.height
    when CENTER then y += (h - @painter__.font.height) / 2
    else
    end
  else
    y -= @painter__.font.ascent
  end
  @painter__.text str, x, y
  nil
end

#textAlign(horizontal, vertical = BASELINE) ⇒ nil

Sets the alignment for drawing text.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1145

def textAlign(horizontal, vertical = BASELINE)
  @textAlignH__ = horizontal
  @textAlignV__ = vertical
  nil
end

#textAscent ⇒ Numeric

Returns ascent of the current font at its current size.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1120

def textAscent()
  @painter__.font.ascent
end

#textDescent ⇒ Numeric

Returns descent of the current font at its current size.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1131

def textDescent()
  @painter__.font.descent
end

#textFont ⇒ Font #textFont(font) ⇒ Font #textFont(name) ⇒ Font #textFont(font, size) ⇒ Font #textFont(name, size) ⇒ Font

Sets text font. (Passing a font name as the first parameter is deprecated)

See Also:



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# File 'lib/processing/graphics_context.rb', line 1072

def textFont(font = nil, size = nil)
  if font != nil || size != nil
    size = FONT_SIZE_MAX__ if size && size > FONT_SIZE_MAX__
    if font.nil? || font.kind_of?(String)
      font = createFont font, size
    elsif size
      font.setSize__ size
    end
    @painter__.font = font.getInternal__
    @textFont__     = font
  end
  @textFont__
end

#textLeading ⇒ Numeric #textLeading(leading) ⇒ Numeric

Sets the spacing between lines of text in units of pixels.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1163

def textLeading(leading = nil)
  @painter__.line_height = leading if leading
  @painter__.line_height
end

#textSize(size) ⇒ nil

Sets text size.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1095

def textSize(size)
  textFont @textFont__, size
  nil
end

#texture(image) ⇒ nil

Sets texture.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1177

def texture(image)
  @painter__.texture image&.getInternal__
  nil
end

#textureMode(mode) ⇒ nil

Sets the coordinate space for texture mapping.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1200

def textureMode(mode)
  @painter__.texcoord_mode = mode
  nil
end

#textureWrap(wrap) ⇒ nil

Sets the texture wrapping mode.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1214

def textureWrap(wrap)
  @painter__.texcoord_wrap = wrap
  nil
end

#textWidth(str) ⇒ Numeric

Returns the width of the text.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1109

def textWidth(str)
  @painter__.font.width str
end

#tint(rgb) ⇒ nil #tint(rgb, alpha) ⇒ nil #tint(gray) ⇒ nil #tint(gray, alpha) ⇒ nil #tint(r, g, b) ⇒ nil #tint(r, g, b, alpha) ⇒ nil

Sets fill color for drawing images.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1002

def tint(*args)
  @tint__ = args
  nil
end

#translate(x, y) ⇒ nil #translate(x, y, z) ⇒ nil

Applies translation matrix to current transformation matrix.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1941

def translate(x, y, z = 0)
  assertDrawing__
  @painter__.translate x, y, z
  nil
end

#triangle(x1, y1, x2, y2, x3, y3) ⇒ nil Also known as: drawTriangle

Draws a triangle.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1477

def triangle(x1, y1, x2, y2, x3, y3)
  assertDrawing__
  @painter__.line x1, y1, x2, y2, x3, y3, loop: true
  nil
end

#updatePixels(&block) ⇒ nil

Update the image pixels with the ‘pixels’ array.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1888

def updatePixels(&block)
  return if !block && !@pixels__
  if block
    loadPixels
    block.call pixels
  end
  getInternal__.tap do |img|
    img.pixels = @pixels__
    img.paint {} # update texture and set modifiied
  end
  @pixels__ = nil
end

#vertex(x, y) ⇒ nil #vertex(x, y, u, v) ⇒ nil

Append vertex for shape polygon.

See Also:



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# File 'lib/processing/graphics_context.rb', line 1768

def vertex(x, y, u = nil, v = nil)
  (@drawingShape__ or raise "vertex() must be called after beginShape()")
    .vertex x, y, u, v
end

#width ⇒ Numeric

Returns the width of the graphics object.

See Also:



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# File 'lib/processing/graphics_context.rb', line 419

def width()
  getInternal__.width
end