ebiten/examples/keyboard/main.go
2022-11-08 23:50:04 +09:00

99 lines
2.3 KiB
Go

// 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"
"log"
"strings"
"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/ebitenutil"
"github.com/hajimehoshi/ebiten/v2/examples/keyboard/keyboard"
rkeyboard "github.com/hajimehoshi/ebiten/v2/examples/resources/images/keyboard"
"github.com/hajimehoshi/ebiten/v2/inpututil"
)
const (
screenWidth = 320
screenHeight = 240
)
var keyboardImage *ebiten.Image
func init() {
img, _, err := image.Decode(bytes.NewReader(rkeyboard.Keyboard_png))
if err != nil {
log.Fatal(err)
}
keyboardImage = ebiten.NewImageFromImage(img)
}
type Game struct {
keys []ebiten.Key
}
func (g *Game) Update() error {
g.keys = inpututil.AppendPressedKeys(g.keys[:0])
return nil
}
func (g *Game) Draw(screen *ebiten.Image) {
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)
screen.DrawImage(keyboardImage, op)
// Draw the highlighted keys.
op = &ebiten.DrawImageOptions{}
for _, p := range g.keys {
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)
}
keyStrs := []string{}
for _, k := range g.keys {
keyStrs = append(keyStrs, k.String())
}
ebitenutil.DebugPrint(screen, strings.Join(keyStrs, ", "))
}
func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
return screenWidth, screenHeight
}
func main() {
ebiten.SetWindowSize(screenWidth*2, screenHeight*2)
ebiten.SetWindowTitle("Keyboard (Ebitengine Demo)")
if err := ebiten.RunGame(&Game{}); err != nil {
log.Fatal(err)
}
}