lib/themes/shadow.rb

   1 require 'ext/loader'
   2
   3 module Shadower
   4   ShadowData = Struct.new(:radius, :color, :grow, :offset)
   5   DEFAULT_SHADOW_DATA =
   6     ShadowData.new(7.0, Qt::Color.new(0x40, 0x40, 0x50), 5, Qt::PointF.new(6, 4))
   7
   8   def with_shadow(loader, data = DEFAULT_SHADOW_DATA)
   9     lambda do |piece, size|
  10       isz = size * 100 / (100 + data.grow) + Qt::PointF.new(0.5, 0.5)
  11       off = Qt::PointF.new(
  12         data.offset.x * isz.x / 200.0,
  13         data.offset.y * isz.x / 200.0)
  14       img = loader[piece, isz]
  15       scaled_data = ShadowData.new(data.radius * isz.x / 100.0,
  16                                    data.color,
  17                                    size.x - isz.x,
  18                                    off)
  19       s = shadow(img, scaled_data)
  20       Qt::Painter.new(s).paint do |p|
  21         dst = Qt::RectF.new((size.x - isz.x) / 2 - off.x,
  22                             (size.y - isz.y) / 2 - off.y,
  23                             isz.x, isz.y)
  24         p.draw_image(dst, img, Qt::RectF.new(Qt::PointF.new(0, 0), isz))
  25       end
  26       s
  27     end
  28   end
  29
  30   private
  31
  32   def shadow(img, data)
  33     img = Qt::Image.painted(Qt::Point.new(img.width + data.grow,
  34                                           img.height + data.grow)) do |p|
  35       px = (data.grow * 0.5 + data.offset.x).to_i
  36       py = (data.grow * 0.5 + data.offset.y).to_i
  37
  38       p.composition_mode = Qt::Painter::CompositionMode_Source
  39       p.fill_rect Qt::Rect.new(px, py, img.width, img.height), data.color
  40       p.composition_mode = Qt::Painter::CompositionMode_DestinationAtop
  41       p.draw_image Qt::Point.new(px, py), img
  42     end
  43     img.exp_blur(data.radius)
  44     img
  45   end
  46 end