// 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. //go:generate go run gen.go package ebitenutil import ( "bytes" _ "embed" "image" _ "image/png" "github.com/hajimehoshi/ebiten/v2" ) //go:embed text.png var text_png []byte var ( debugPrintTextImage *ebiten.Image debugPrintTextSubImages = map[rune]*ebiten.Image{} ) func init() { img, _, err := image.Decode(bytes.NewReader(text_png)) if err != nil { panic(err) } debugPrintTextImage = ebiten.NewImageFromImage(img) } // DebugPrint draws the string str on the image on left top corner. // // The available runes are in U+0000 to U+00FF, which is C0 Controls and Basic Latin and C1 Controls and Latin-1 Supplement. func DebugPrint(image *ebiten.Image, str string) { DebugPrintAt(image, str, 0, 0) } // DebugPrintAt draws the string str on the image at (x, y) position. // // The available runes are in U+0000 to U+00FF, which is C0 Controls and Basic Latin and C1 Controls and Latin-1 Supplement. func DebugPrintAt(image *ebiten.Image, str string, x, y int) { drawDebugText(image, str, x, y) } func drawDebugText(rt *ebiten.Image, str string, ox, oy int) { op := &ebiten.DrawImageOptions{} x := 0 y := 0 w, _ := debugPrintTextImage.Size() for _, c := range str { const ( cw = 6 ch = 16 ) if c == '\n' { x = 0 y += ch continue } s, ok := debugPrintTextSubImages[c] if !ok { n := w / cw sx := (int(c) % n) * cw sy := (int(c) / n) * ch s = debugPrintTextImage.SubImage(image.Rect(sx, sy, sx+cw, sy+ch)).(*ebiten.Image) debugPrintTextSubImages[c] = s } op.GeoM.Reset() op.GeoM.Translate(float64(x), float64(y)) op.GeoM.Translate(float64(ox+1), float64(oy)) rt.DrawImage(s, op) x += cw } }