Class: DYI::Drawing::ColorEffect::LinearGradient

Inherits:
Object
  • Object
show all
Defined in:
lib/ironruby.rb,
lib/dyi/drawing/color_effect.rb

Overview

Since:

  • 0.0.0

Constant Summary collapse

SPREAD_METHODS =

Since:

  • 0.0.0

['pad', 'reflect', 'repeat']

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(start_point = [0,0], stop_point = [1,0], spread_method = nil) ⇒ LinearGradient

Returns a new instance of LinearGradient.

Since:

  • 0.0.0



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# File 'lib/dyi/drawing/color_effect.rb', line 33

def initialize(start_point=[0,0], stop_point=[1,0], spread_method=nil)
  @start_point = start_point
  @stop_point = stop_point
  self.spread_method = spread_method
  @child_elements = []
end

Instance Attribute Details

#spread_method ⇒ Object

Since:

  • 0.0.0



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# File 'lib/dyi/drawing/color_effect.rb', line 31

def spread_method
  @spread_method
end

#start_point ⇒ Object (readonly)

Since:

  • 0.0.0



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# File 'lib/dyi/drawing/color_effect.rb', line 31

def start_point
  @start_point
end

#stop_point ⇒ Object (readonly)

Since:

  • 0.0.0



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# File 'lib/dyi/drawing/color_effect.rb', line 31

def stop_point
  @stop_point
end

Class Method Details

.simple_gradation(derection, *colors) ⇒ Object

Since:

  • 0.0.0



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# File 'lib/dyi/drawing/color_effect.rb', line 73

def simple_gradation(derection, *colors)
  case count = colors.size
  when 0
    nil
  when 1
    Color.new(colors.first)
  else
    case deraction
      when :vertical then obj = new([0,0], [0,1])
      when :horizontal then obj = new([0,0], [1,0])
      when :lowerright then obj = new([0,0], [1,1])
      when :upperright then obj = new([0,1], [1,0])
      else raise ArgumentError, "unknown derection: `#{derection}'"
    end
    colors.each_with_index do |color, i|
      obj.add_color(i.quo(count - 1), color)
    end
    obj
  end
end

Instance Method Details

#add_color(offset, color) ⇒ Object

Since:

  • 0.0.0



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# File 'lib/dyi/drawing/color_effect.rb', line 40

def add_color(offset, color)
  @child_elements.push(GradientStop.new(offset, :color => color))
end

#add_color_opacity(offset, color, opacity) ⇒ Object

Since:

  • 0.0.0



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# File 'lib/dyi/drawing/color_effect.rb', line 48

def add_color_opacity(offset, color, opacity)
  @child_elements.push(GradientStop.new(offset, :color => color, :opacity => opacity))
end

#add_opacity(offset, opacity) ⇒ Object

Since:

  • 0.0.0



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# File 'lib/dyi/drawing/color_effect.rb', line 44

def add_opacity(offset, opacity)
  @child_elements.push(GradientStop.new(offset, :opacity => opacity))
end

#child_elements ⇒ Object

Since:

  • 0.0.0



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# File 'lib/dyi/drawing/color_effect.rb', line 57

def child_elements
  @child_elements.clone
end

#cls_wrap_mode ⇒ Object

Since:

  • 0.0.0



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# File 'lib/ironruby.rb', line 219

def cls_wrap_mode
  case spread_method
    when 'pad' then System::Drawing::Drawing2D::WrapMode.tile_flip_xy
    when 'reflect' then System::Drawing::Drawing2D::WrapMode.tile_flip_xy
    when 'repeat' then System::Drawing::Drawing2D::WrapMode.tile
    else System::Drawing::Drawing2D::WrapMode.tile_flip_xy
  end
end

#color? ⇒ Boolean

Returns:

  • (Boolean)

Since:

  • 0.0.0



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# File 'lib/dyi/drawing/color_effect.rb', line 61

def color?
  true
end

#create_cls_brush(opacity = nil, shape = nil) ⇒ Object

Since:

  • 0.0.0



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# File 'lib/ironruby.rb', line 176

def create_cls_brush(opacity=nil, shape=nil)
  brush = System::Drawing::Drawing2D::LinearGradientBrush.new(
      System::Drawing::PointF.new(
          shape.left.to_f * (1.0 - start_point[0]) + shape.right.to_f * start_point[0],
          shape.top.to_f * (1.0 - start_point[1]) + shape.bottom.to_f * start_point[1]),
      System::Drawing::PointF.new(
          shape.left.to_f * (1.0 - stop_point[0]) + shape.right.to_f * stop_point[0],
          shape.top.to_f * (1.0 - stop_point[1]) + shape.bottom.to_f * stop_point[1]),
      System::Drawing::Color.empty,
      System::Drawing::Color.empty)
  start_pad = end_pad = false
  if !spread_method || spread_method == 'pad'
    start_pad = (0.001 < @child_elements.first.offset && @child_elements.first.offset < 0.999)
    end_pad = (0.001 < @child_elements.last.offset && @child_elements.last.offset < 0.999)
  end
  color_count = @child_elements.size
  color_count += 1 if start_pad
  color_count += 1 if end_pad
  color_blend = System::Drawing::Drawing2D::ColorBlend.new(color_count)
  cls_colors = System::Array[System::Drawing::Color].new(color_count)
  positions = System::Array[System::Single].new(color_count)
  if start_pad
    gradient_stop = @child_elements.first
    cls_colors[0] = gradient_stop.color.to_cls_color(gradient_stop.opacity)
    positions[0] = 0.0
  end
  @child_elements.each_with_index do |gradient_stop, i|
    idx = start_pad ? i + 1 : i
    cls_colors[idx] = gradient_stop.color.to_cls_color(gradient_stop.opacity)
    positions[idx] = gradient_stop.offset.to_f
  end
  if end_pad
    gradient_stop = @child_elements.last
    cls_colors[color_count - 1] = gradient_stop.color.to_cls_color(gradient_stop.opacity)
    positions[color_count - 1] = 1.0
  end
  color_blend.colors = cls_colors
  color_blend.positions = positions
  brush.interpolation_colors = color_blend
  brush.wrap_mode = cls_wrap_mode
  brush
end

#write_as(formatter, io = $>) ⇒ Object

Since:

  • 0.0.0



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# File 'lib/dyi/drawing/color_effect.rb', line 65

def write_as(formatter, io=$>)
  formatter.write_linear_gradient(self, io)
end