### Home Classes Methods

### In Files

- lib/rabbit/graffiti/processor.rb

### Parent

Object

### Methods

- ::new
- #button_motion
- #button_press
- #button_release
- #can_undo?
- #change_color
- #clear
- #clear_config
- #dragging?
- #draw_all_segment
- #draw_last_segment
- #have_graffiti?
- #undo

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No matching classes.

# Rabbit::Graffiti::Processor

### Constants

DEFAULT_COLOR
DEFAULT_LINE_WIDTH

### Attributes

color[RW]
line_width[RW]

### Public Class Methods

new(default_config={}) click to toggle source

    # File lib/rabbit/graffiti/processor.rb, line 13
    def initialize(default_config={})
      @default_color = default_config["color"] || DEFAULT_COLOR
      @default_line_width = default_config["line_width"] || DEFAULT_LINE_WIDTH
      clear
      clear_config
    end

### Public Instance Methods

button_motion(x, y, width, height) click to toggle source

    # File lib/rabbit/graffiti/processor.rb, line 39
    def button_motion(x, y, width, height)
      if @pressed
        @segments.last << [x.to_f / width, y.to_f / height]
      end
    end

button_press(x, y, width, height) click to toggle source

    # File lib/rabbit/graffiti/processor.rb, line 28
    def button_press(x, y, width, height)
      @pressed = true
      @undo_index = nil
      @segments << [[x.to_f / width, y.to_f / height]]
    end

button_release(x, y, width, height) click to toggle source

    # File lib/rabbit/graffiti/processor.rb, line 34
    def button_release(x, y, width, height)
      @pressed = false
      @undo_stack << [:push]
    end

can_undo?() click to toggle source

    # File lib/rabbit/graffiti/processor.rb, line 24
    def can_undo?
      not @undo_stack.empty?
    end

change_color(&block) click to toggle source

    # File lib/rabbit/graffiti/processor.rb, line 83
    def change_color(&block)
      dialog = Graffiti::ConfigDialog.new(@color, @line_width)
      dialog.run do |color, line_width|
        @color = color if color
        @line_width = line_width if line_width
        block.call
      end
    end

clear() click to toggle source

    # File lib/rabbit/graffiti/processor.rb, line 76
    def clear
      @pressed = false
      @segments = []
      @undo_stack = []
      @undo_index = nil
    end

clear_config() click to toggle source

    # File lib/rabbit/graffiti/processor.rb, line 92
    def clear_config
      @color = @default_color
      @line_width = @default_line_width
    end

dragging?() click to toggle source

    # File lib/rabbit/graffiti/processor.rb, line 72
    def dragging?
      @pressed
    end

draw_all_segment(renderer) click to toggle source

    # File lib/rabbit/graffiti/processor.rb, line 59
    def draw_all_segment(renderer)
      return if @segments.empty?
      args = [@color, {:line_width => @line_width, :opened => true}]
      width = renderer.width
      height = renderer.height
      @segments.each do |points|
        converted_points = points.collect do |x, y|
          [x * width, y * height]
        end
        renderer.draw_lines(converted_points, *args)
      end
    end

draw_last_segment(renderer) click to toggle source

    # File lib/rabbit/graffiti/processor.rb, line 45
    def draw_last_segment(renderer)
      points = @segments.last
      if points.size >= 2
        width = renderer.width
        height = renderer.height
        prev, current = points[-2..-1]
        prev_x, prev_y = prev
        x, y = current
        renderer.draw_line(prev_x * width, prev_y * height,
                           x * width, y * height,
                           @color, {:line_width => @line_width})
      end
    end

have_graffiti?() click to toggle source

    # File lib/rabbit/graffiti/processor.rb, line 20
    def have_graffiti?
      not @segments.empty?
    end

undo() click to toggle source

    # File lib/rabbit/graffiti/processor.rb, line 97
    def undo
      @undo_index ||= @undo_stack.size - 1
      command, segment = @undo_stack[@undo_index]
      case command
      when :push
        @undo_stack << [:pop, @segments.pop]
      when :pop
        @segments << segment
        @undo_stack << [:push]
      end

      if @undo_index > 0
        @undo_index -= 1
      else
        @undo_index = nil
      end
    end

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