ebiten/examples/keyboard/main.go

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// Copyright 2015 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 main
import (
"bytes"
"image"
_ "image/png"
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"log"
"strings"
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"github.com/hajimehoshi/bitmapfont/v3"
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"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/examples/keyboard/keyboard"
rkeyboard "github.com/hajimehoshi/ebiten/v2/examples/resources/images/keyboard"
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"github.com/hajimehoshi/ebiten/v2/inpututil"
"github.com/hajimehoshi/ebiten/v2/text/v2"
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)
const (
screenWidth = 320
screenHeight = 240
)
var fontFace = text.NewStdFace(bitmapfont.Face)
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var keyboardImage *ebiten.Image
func init() {
img, _, err := image.Decode(bytes.NewReader(rkeyboard.Keyboard_png))
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if err != nil {
log.Fatal(err)
}
keyboardImage = ebiten.NewImageFromImage(img)
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}
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type Game struct {
keys []ebiten.Key
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}
func (g *Game) Update() error {
g.keys = inpututil.AppendPressedKeys(g.keys[:0])
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return nil
}
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func (g *Game) Draw(screen *ebiten.Image) {
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const (
offsetX = 24
offsetY = 40
)
// Draw the base (grayed) keyboard image.
op := &ebiten.DrawImageOptions{}
op.GeoM.Translate(offsetX, offsetY)
op.ColorScale.Scale(0.5, 0.5, 0.5, 1)
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screen.DrawImage(keyboardImage, op)
// Draw the highlighted keys.
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op = &ebiten.DrawImageOptions{}
for _, p := range g.keys {
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op.GeoM.Reset()
r, ok := keyboard.KeyRect(p)
if !ok {
continue
}
op.GeoM.Translate(float64(r.Min.X), float64(r.Min.Y))
op.GeoM.Translate(offsetX, offsetY)
screen.DrawImage(keyboardImage.SubImage(r).(*ebiten.Image), op)
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}
var keyStrs []string
var keyNames []string
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for _, k := range g.keys {
keyStrs = append(keyStrs, k.String())
if name := ebiten.KeyName(k); name != "" {
keyNames = append(keyNames, name)
}
}
// Use bitmapfont.Face instead of ebitenutil.DebugPrint, since some key names might not be printed with DebugPrint.
textOp := &text.DrawOptions{}
textOp.LineHeightInPixels = fontFace.Metrics().Height
text.Draw(screen, strings.Join(keyStrs, ", ")+"\n"+strings.Join(keyNames, ", "), fontFace, textOp)
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}
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func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
return screenWidth, screenHeight
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}
func main() {
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ebiten.SetWindowSize(screenWidth*2, screenHeight*2)
ebiten.SetWindowTitle("Keyboard (Ebitengine Demo)")
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if err := ebiten.RunGame(&Game{}); err != nil {
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log.Fatal(err)
}
}