# Copyright (c) 2007-2021 Andy Maleh
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

require 'glimmer-dsl-swt'
        
include Glimmer
  
shell {
  grid_layout {
    margin_width 0
    margin_height 0
    margin_top 5
  }
  text 'Hello, Canvas Path!'
  minimum_size 800, 700
  
  @button = button {
    layout_data :center, :center, true, false
    text 'Regenerate'
    enabled false
    
    on_widget_selected do
      @regenerate = true
      @button.enabled = false
    end
  }
  canvas {
    layout_data :fill, :fill, true, true
    background :white
    
    text('line', 15, 200) {
      foreground :red
    }
    @path1 = path {
      antialias :on
      foreground :red
    }
    
    text('quad', 15, 300) {
      foreground :dark_green
    }
    @path2 = path {
      antialias :on
      foreground :dark_green
    }
    
    text('cubic', 15, 400) {
      foreground :blue
    }
    @path3 = path {
      antialias :on
      foreground :blue
    }
  }
  
  on_swt_show do
    @regenerate = true
    @thread = Thread.new do
      loop do
        if @regenerate
          @regenerate = false
          @path1.clear
          @path2.clear
          @path3.clear
          y1 = y2 = y3 = 300
          700.times.each do |x|
            x += 55
            x1 = x - 2
            x2 = x - 1
            x3 = x
            y1 = y3
            y2 = y1
            y3 = [[y3 + (rand*24 - 12), 0].max, 700].min
            @path1.content {
              line(x1, y1 - 100)
            }
            if x % 2 == 0
              @path2.content {
                quad(x1, y1, x2, y2)
              }
            end
            if x % 3 == 0
              @path3.content {
                cubic(x1, y1 + 100, x2, y2 + 100, x3, y3 + 100)
              }
            end
            sleep(0.01)
          end
          @button.enabled = true
        end
        sleep(0.1)
      end
            
    end
    
  end
  
  on_widget_disposed do
    @thread.kill # safe to kill since data is in memory only
  end
  
}.open