lib/plugins/shadow.rb

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