ebiten/ebitenutil/debugprint.go

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/*
Copyright 2014 Hajime Hoshi
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package ebitenutil
import (
"github.com/hajimehoshi/ebiten"
"github.com/hajimehoshi/ebiten/internal/assets"
"image/color"
)
type debugPrintState struct {
textTexture ebiten.TextureID
debugPrintRenderTarget ebiten.RenderTargetID
y int
}
var defaultDebugPrintState = new(debugPrintState)
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func DebugPrint(gr ebiten.GraphicsContext, str string) {
defaultDebugPrintState.DebugPrint(gr, str)
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}
func (d *debugPrintState) drawText(gr ebiten.GraphicsContext, str string, x, y int, clr color.Color) {
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parts := []ebiten.TexturePart{}
locationX, locationY := 0, 0
for _, c := range str {
if c == '\n' {
locationX = 0
locationY += assets.TextImageCharHeight
continue
}
code := int(c)
const xCharNum = assets.TextImageWidth / assets.TextImageCharWidth
srcX := (code % xCharNum) * assets.TextImageCharWidth
srcY := (code / xCharNum) * assets.TextImageCharHeight
parts = append(parts, ebiten.TexturePart{
LocationX: locationX,
LocationY: locationY,
Source: ebiten.Rect{srcX, srcY, assets.TextImageCharWidth, assets.TextImageCharHeight},
})
locationX += assets.TextImageCharWidth
}
geom := ebiten.GeometryMatrixI()
geom.Translate(float64(x)+1, float64(y))
clrm := ebiten.ColorMatrixI()
clrm.Scale(clr)
gr.Texture(d.textTexture).Draw(parts, geom, clrm)
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}
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func (d *debugPrintState) DebugPrint(gr ebiten.GraphicsContext, str string) {
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if d.textTexture.IsNil() {
img, err := assets.TextImage()
if err != nil {
panic(err)
}
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d.textTexture, err = ebiten.NewTextureID(img, ebiten.FilterNearest)
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if err != nil {
panic(err)
}
}
if d.debugPrintRenderTarget.IsNil() {
width, height := 256, 256
var err error
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d.debugPrintRenderTarget, err = ebiten.NewRenderTargetID(width, height, ebiten.FilterNearest)
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if err != nil {
panic(err)
}
}
d.drawText(gr, str, 1, d.y+1, &color.RGBA{0x00, 0x00, 0x00, 0x80})
d.drawText(gr, str, 0, d.y, &color.RGBA{0xff, 0xff, 0xff, 0xff})
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}