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examples/common: Use SourceRect (#277)

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This commit is contained in:
Hajime Hoshi 2017-05-28 02:40:13 +09:00
parent f88d5ab1ef
commit 0d1d6cfd85
4 changed files with 28 additions and 44 deletions
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4
examples/airship/main.go
View File

@ -158,8 +158,8 @@ func drawGroundImage(screen *ebiten.Image, ground *ebiten.Image) {
op.GeoM.Translate(float64(w)/2, 0)
op.GeoM.Translate(float64(screenWidth-w)/2, screenHeight/3)
p := image.Rect(0, i, w, i+1)
op.SourceRect = &p
src := image.Rect(0, i, w, i+1)
op.SourceRect = &src
screen.DrawImage(ground, op)
}
op = &ebiten.DrawImageOptions{}

4
examples/blocks/blocks/piece.go
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@ -166,8 +166,8 @@ func drawBlocks(r *ebiten.Image, blocks [][]BlockType, x, y int, clr ebiten.Colo
continue
}
x := (int(block) - 1) * blockWidth
p := image.Rect(x, 0, x+blockWidth, blockHeight)
op.SourceRect = &p
src := image.Rect(x, 0, x+blockWidth, blockHeight)
op.SourceRect = &src
r.DrawImage(imageBlocks, op)
}
}

60
examples/common/font.go
View File

@ -56,43 +56,8 @@ func init() {
ArcadeFont = &Font{eimg, img, 32, 16, 8, 8}
}
type fontImageParts struct {
str string
font *Font
}
func (f *fontImageParts) Len() int {
return len(f.str)
}
func (f *fontImageParts) Dst(i int) (x0, y0, x1, y1 int) {
x := i - strings.LastIndex(f.str[:i], "\n") - 1
y := strings.Count(f.str[:i], "\n")
x *= f.font.charWidth
y *= f.font.charHeight
if x < 0 {
return 0, 0, 0, 0
}
return x, y, x + f.font.charWidth, y + f.font.charHeight
}
func (f *fontImageParts) Src(i int) (x0, y0, x1, y1 int) {
code := int(f.str[i])
if code == '\n' {
return 0, 0, 0, 0
}
x := (code % f.font.charNumPerLine) * f.font.charWidth
y := ((code - f.font.offset) / f.font.charNumPerLine) * f.font.charHeight
return x, y, x + f.font.charWidth, y + f.font.charHeight
}
func (f *Font) DrawText(rt *ebiten.Image, str string, ox, oy, scale int, c color.Color) {
options := &ebiten.DrawImageOptions{
ImageParts: &fontImageParts{str, f},
}
options.GeoM.Scale(float64(scale), float64(scale))
options.GeoM.Translate(float64(ox), float64(oy))
op := &ebiten.DrawImageOptions{}
ur, ug, ub, ua := c.RGBA()
const max = math.MaxUint16
r := float64(ur) / max
@ -104,8 +69,27 @@ func (f *Font) DrawText(rt *ebiten.Image, str string, ox, oy, scale int, c color
g /= a
b /= a
}
options.ColorM.Scale(r, g, b, a)
rt.DrawImage(f.image, options)
op.ColorM.Scale(r, g, b, a)
x := 0
y := 0
for _, c := range str {
if c == '\n' {
x = 0
y += f.charHeight
continue
}
sx := (int(c) % f.charNumPerLine) * f.charWidth
sy := ((int(c) - f.offset) / f.charNumPerLine) * f.charHeight
r := image.Rect(sx, sy, sx+f.charWidth, sy+f.charHeight)
op.SourceRect = &r
op.GeoM.Reset()
op.GeoM.Translate(float64(x), float64(y))
op.GeoM.Scale(float64(scale), float64(scale))
op.GeoM.Translate(float64(ox), float64(oy))
rt.DrawImage(f.image, op)
x += f.charWidth
}
}
func (f *Font) DrawTextOnImage(rt draw.Image, str string, ox, oy int) {

4
examples/perspective/main.go
View File

@ -49,8 +49,8 @@ func update(screen *ebiten.Image) error {
maxWidth := float64(w) + float64(h)*3/4
op.GeoM.Translate(-maxWidth/2, -float64(h)/2)
op.GeoM.Translate(screenWidth/2, screenHeight/2)
p := image.Rect(0, i, w, i+1)
op.SourceRect = &p
r := image.Rect(0, i, w, i+1)
op.SourceRect = &r
screen.DrawImage(gophersImage, op)
}
return nil