func makeStone(name string, circleMask *image.Alpha) (*image.RGBA, *image.Alpha) {
stone := get(name, stoneSize0)
dst := image.NewRGBA(stone.Bounds())
// Make the whole area black, for the shadow.
draw.Draw(dst, dst.Bounds(), image.Black, ZP, draw.Src)
// Lay in the stone within the circle so it shows up inside the shadow.
draw.DrawMask(dst, dst.Bounds(), stone, ZP, circleMask, ZP, draw.Over)
return dst, makeShadowMask(stone)
}
func (ig *ImageGraphics) Text(x, y int, t string, align string, rot int, f chart.Font) {
if len(align) == 1 {
align = "c" + align
}
var col color.Color
if f.Color != nil {
col = f.Color
} else {
col = color.RGBA{0, 0, 0, 0xff}
}
textImage := ig.textBox(t, f, col)
bounds := textImage.Bounds()
w, h := bounds.Dx(), bounds.Dy()
var centerX, centerY int
if rot != 0 {
alpha := float64(rot) / 180 * math.Pi
cos := math.Cos(alpha)
sin := math.Sin(alpha)
ax, ay := float64(w), float64(h) // anchor point
switch align[0] {
case 'b':
case 'c':
ay /= 2
case 't':
ay = 0
}
switch align[1] {
case 'l':
ax = 0
case 'c':
ax /= 2
case 'r':
}
dx := float64(ax)*cos + float64(ay)*sin
dy := -float64(ax)*sin + float64(ay)*cos
trans := f64.Aff3{
+cos, +sin, float64(x+ig.x0) - dx,
-sin, +cos, float64(y+ig.y0) - dy,
}
draw.BiLinear.Transform(ig.Image, trans,
textImage, textImage.Bounds(), draw.Over, nil)
return
} else {
centerX, centerY = w/2, h/2
switch align[0] {
case 'b':
centerY = h
case 't':
centerY = 0
}
switch align[1] {
case 'l':
centerX = 0
case 'r':
centerX = w
}
}
bounds = textImage.Bounds()
w, h = bounds.Dx(), bounds.Dy()
x -= centerX
y -= centerY
x += ig.x0
y += ig.y0
tcol := image.NewUniform(col)
draw.DrawMask(ig.Image, image.Rect(x, y, x+w, y+h), tcol, image.ZP,
textImage, textImage.Bounds().Min, draw.Over)
}
func (b *Board) drawPiece(m *image.RGBA, ij IJ, piece *Piece) {
xy := ij.XYStone(&b.Dims)
xy = xy.Add(piece.delta)
draw.DrawMask(m, xy, piece.stone.image, ZP, piece.stone.mask, ZP, draw.Over)
}