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ebitenutil: Use SourceRect (#277)

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This commit is contained in:
Hajime Hoshi 2017-05-28 03:10:32 +09:00
parent 7773aff3f7
commit 691db07678
1 changed files with 27 additions and 8 deletions
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33
ebitenutil/debugprint.go
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@ -15,11 +15,13 @@
package ebitenutil
import (
"github.com/hajimehoshi/ebiten"
"github.com/hajimehoshi/ebiten/ebitenutil/internal/assets"
"image"
"image/color"
"math"
"strings"
"github.com/hajimehoshi/ebiten"
"github.com/hajimehoshi/ebiten/ebitenutil/internal/assets"
)
type debugPrintImageParts string
@ -67,7 +69,8 @@ func DebugPrint(image *ebiten.Image, str string) error {
return nil
}
func (d *debugPrintState) drawText(rt *ebiten.Image, str string, x, y int, c color.Color) {
func (d *debugPrintState) drawText(rt *ebiten.Image, str string, ox, oy int, c color.Color) {
op := &ebiten.DrawImageOptions{}
ur, ug, ub, ua := c.RGBA()
const max = math.MaxUint16
r := float64(ur) / max
@ -79,12 +82,28 @@ func (d *debugPrintState) drawText(rt *ebiten.Image, str string, x, y int, c col
g /= a
b /= a
}
op := &ebiten.DrawImageOptions{
ImageParts: debugPrintImageParts(str),
}
op.GeoM.Translate(float64(x+1), float64(y))
op.ColorM.Scale(r, g, b, a)
x := 0
y := 0
for _, c := range str {
const cw = assets.TextImageCharWidth
const ch = assets.TextImageCharHeight
if c == '\n' {
x = 0
y += ch
continue
}
const n = assets.TextImageWidth / cw
sx := (int(c) % n) * cw
sy := (int(c) / n) * ch
r := image.Rect(sx, sy, sx+cw, sy+ch)
op.SourceRect = &r
op.GeoM.Reset()
op.GeoM.Translate(float64(x), float64(y))
op.GeoM.Translate(float64(ox+1), float64(oy))
_ = rt.DrawImage(d.textImage, op)
x += cw
}
}
// DebugPrint prints the given text str on the given image r.