Class: GridOverlayView

Inherits:
UIView
  • Object
show all
Defined in:
lib/project/views/overlay_view.rb

Constant Summary collapse

DEFAULTS = 
{ stroke_color: UIColor.grayColor,
stroke_width: 1.0,
x_lines: 3,
y_lines: 3 }

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#stroke_color ⇒ Object

Returns the value of attribute stroke_color.



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# File 'lib/project/views/overlay_view.rb', line 8

def stroke_color
  @stroke_color
end

#stroke_width ⇒ Object

Returns the value of attribute stroke_width.



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# File 'lib/project/views/overlay_view.rb', line 8

def stroke_width
  @stroke_width
end

#x_interval ⇒ Object

Returns the value of attribute x_interval.



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# File 'lib/project/views/overlay_view.rb', line 7

def x_interval
  @x_interval
end

#y_interval ⇒ Object

Returns the value of attribute y_interval.



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# File 'lib/project/views/overlay_view.rb', line 7

def y_interval
  @y_interval
end

Instance Method Details

#context ⇒ Object 



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# File 'lib/project/views/overlay_view.rb', line 109

def context
  @_context ||= UIGraphicsGetCurrentContext()
end

#draw_horizontal_lines ⇒ Object 



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# File 'lib/project/views/overlay_view.rb', line 93

def draw_horizontal_lines
  draw_line([0, y_interval],     [size.width, y_interval])
  draw_line([0, y_interval * 2], [size.width, y_interval * 2])
end

#draw_line(start_point, end_point) ⇒ Object 



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# File 'lib/project/views/overlay_view.rb', line 103

def draw_line(start_point, end_point)
  CGContextMoveToPoint(context, start_point[0], start_point[1])

  CGContextAddLineToPoint(context, end_point[0], end_point[1])
end

#draw_vertical_lines ⇒ Object 



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# File 'lib/project/views/overlay_view.rb', line 98

def draw_vertical_lines
  draw_line([x_interval, 0],     [x_interval, size.height])
  draw_line([x_interval * 2, 0], [x_interval * 2.0, size.height])
end

#drawRect(rect) ⇒ Object 



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# File 'lib/project/views/overlay_view.rb', line 79

def drawRect(rect)
  super

  setup_drawing
  draw_vertical_lines
  draw_horizontal_lines

  fill_path
end

#fill_path ⇒ Object 



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# File 'lib/project/views/overlay_view.rb', line 89

def fill_path
  CGContextStrokePath(context)
end

#hidden? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/project/views/overlay_view.rb', line 21

def hidden?
  stroke_color == UIColor.clearColor
end

#hide ⇒ Object 



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# File 'lib/project/views/overlay_view.rb', line 39

def hide
  unless hidden?
    @original_color = stroke_color

    self.stroke_color = UIColor.clearColor

    setNeedsDisplay
  end
end

#initWithFrame(frame) ⇒ Object 



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# File 'lib/project/views/overlay_view.rb', line 10

def initWithFrame(frame)
  super.tap do |view|
    view.backgroundColor = UIColor.clearColor

    self.x_lines      = DEFAULTS[:x_lines]
    self.y_lines      = DEFAULTS[:y_lines]
    self.stroke_color = DEFAULTS[:stroke_color]
    self.stroke_width = DEFAULTS[:stroke_width]
  end
end

#setup_drawing ⇒ Object 



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# File 'lib/project/views/overlay_view.rb', line 73

def setup_drawing
  CGContextSetStrokeColorWithColor(context, stroke_color.CGColor)

  CGContextSetLineWidth(context, stroke_width)
end

#show ⇒ Object 



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# File 'lib/project/views/overlay_view.rb', line 33

def show
  self.stroke_color = @original_color

  setNeedsDisplay
end

#toggle ⇒ Object 



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# File 'lib/project/views/overlay_view.rb', line 25

def toggle
  if hidden?
    show
  else
    hide
  end
end

#x_lines=(lines) ⇒ Object 



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# File 'lib/project/views/overlay_view.rb', line 49

def x_lines=(lines)
  self.x_interval = frame.size.width / lines

  setNeedsDisplay
end

#y_lines=(lines) ⇒ Object 



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# File 'lib/project/views/overlay_view.rb', line 55

def y_lines=(lines)
  self.y_interval = frame.size.height / lines

  setNeedsDisplay
end