Class: GosuLighting::Source

Inherits:
Object
  • Object
show all
Defined in:
lib/gosu_lighting/source.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(window, x, y, radius, att_sprite = nil) ⇒ Source

Returns a new instance of Source.



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# File 'lib/gosu_lighting/source.rb', line 17

def initialize window, x, y, radius, att_sprite = nil
  @att_sprite = att_sprite || Gosu::Image.new(window, 'light.png', true)
  @window = window
  @x = x
  @y = y
  @radius = radius
end

Instance Attribute Details

#radius ⇒ Object

Returns the value of attribute radius.



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# File 'lib/gosu_lighting/source.rb', line 15

def radius
  @radius
end

#x ⇒ Object

Returns the value of attribute x.



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# File 'lib/gosu_lighting/source.rb', line 15

def x
  @x
end

#y ⇒ Object

Returns the value of attribute y.



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# File 'lib/gosu_lighting/source.rb', line 15

def y
  @y
end

Instance Method Details

#draw ⇒ Object 



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# File 'lib/gosu_lighting/source.rb', line 89

def draw
  @window.clip_to(*clip_rect) do
    yield self
  end
end

#draw_attenuation(depth) ⇒ Object 



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# File 'lib/gosu_lighting/source.rb', line 85

def draw_attenuation depth
  draw_as_rect @att_sprite, *clip_rect, depth, 0xff999999, :multiply
end

#shadow_circle(circle, depth = 1) ⇒ Object 



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# File 'lib/gosu_lighting/source.rb', line 25

def shadow_circle circle, depth = 1
  dist = Gosu::distance @x, @y, circle.x, circle.y
  depth = depth + 1.0 - dist / SHADOW_LENGTH

  bx1, by1, bx2, by2 = endpoints_facing circle.x, circle.y, @x, @y, circle.radius

  nx1, ny1 = normal @x, @y, bx1, by1
  nx2, ny2 = normal @x, @y, bx2, by2

  sx1 = bx1 + nx1 * SHADOW_LENGTH
  sy1 = by1 + ny1 * SHADOW_LENGTH
  sx2 = bx2 + nx2 * SHADOW_LENGTH
  sy2 = by2 + ny2 * SHADOW_LENGTH

  @window.gl depth do
    gl_draw_shadow bx1, by1, sx1, sy1, sx2, sy2, bx2, by2, 0.5
  end

  return depth
end

#shadow_rectangle(rect, depth = 2) ⇒ Object 



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# File 'lib/gosu_lighting/source.rb', line 46

def shadow_rectangle rect, depth = 2
  dist = Gosu::distance @x, @y, rect.center_x, rect.center_y
  depth = depth + 1.0 - dist / SHADOW_LENGTH

  cx1 = cx2 = rect.x
  cy1 = cy2 = rect.y
  if @x < rect.x
    cy1 += rect.height
  elsif @x < rect.x + rect.width
    cy1 += rect.height if @y > rect.center_y
    cy2 = cy1
  else
    cy2 += rect.height
  end

  if @y < rect.y
    cx2 += rect.width
  elsif @y < rect.y + rect.height
    cx1 += rect.width if @x > rect.center_x
    cx2 = cx1
  else
    cx1 += rect.width
  end

  nx1, ny1 = normal @x, @y, cx1, cy1
  nx2, ny2 = normal @x, @y, cx2, cy2

  sx1 = cx1 + nx1 * SHADOW_LENGTH
  sy1 = cy1 + ny1 * SHADOW_LENGTH
  sx2 = cx2 + nx2 * SHADOW_LENGTH
  sy2 = cy2 + ny2 * SHADOW_LENGTH

  @window.gl depth do
    gl_draw_shadow cx1, cy1, sx1, sy1, sx2, sy2, cx2, cy2, 1.0
  end

  return depth
end