# File lib/sdl.rb, line 119
    def Surface.transformBlit(src, dst, angle, xscale, yscale,
                              px, py, qx, qy, flags)
      transformed = src.transformSurface(src.colorkey, angle,
                                         xscale, yscale, flags)
      transformed.setColorKey(src.flags & (SDL::SRCCOLORKEY|SDL::RLEACCEL),
                              src.colorkey )
      transformed.setAlpha(src.flags & (SDL::SRCALPHA|SDL::RLEACCEL),
                           src.alpha )
      rad = Math::PI*angle / 180.0
      x = px - src.w/2.0 ; y = py - src.h/2.0
        x *= xscale ; y *= yscale
      dst_x = x*Math.cos(rad)-y*Math.sin(rad) 
      dst_y = x*Math.sin(rad)+y*Math.cos(rad) 
      dst_x += transformed.w / 2
      dst_y += transformed.h / 2
      Surface.blit(transformed, 0, 0, 0, 0, dst, qx-dst_x, qy-dst_y)
    end