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.
// +build example
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package main
import (
_ "image/png"
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"log"
"strconv"
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"github.com/hajimehoshi/ebiten"
"github.com/hajimehoshi/ebiten/ebitenutil"
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"github.com/hajimehoshi/ebiten/examples/keyboard/keyboard"
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)
const (
screenWidth = 320
screenHeight = 240
)
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var keyboardImage *ebiten.Image
func init() {
var err error
keyboardImage, _, err = ebitenutil.NewImageFromFile("_resources/images/keyboard/keyboard.png", ebiten.FilterNearest)
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if err != nil {
log.Fatal(err)
}
}
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var keyNames = map[ebiten.Key]string{
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ebiten.KeyBackspace: "BS",
ebiten.KeyComma: ",",
ebiten.KeyEnter: "Enter",
ebiten.KeyEscape: "Esc",
ebiten.KeyPeriod: ".",
ebiten.KeySpace: "Space",
ebiten.KeyTab: "Tab",
ebiten.KeyMinus: "-",
ebiten.KeyEqual: "=",
ebiten.KeyBackslash: "\\",
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ebiten.KeyGraveAccent: "`",
ebiten.KeyLeftBracket: "[",
ebiten.KeyRightBracket: "]",
ebiten.KeySemicolon: ";",
ebiten.KeyApostrophe: "'",
ebiten.KeySlash: "/",
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// Arrows
ebiten.KeyDown: "Down",
ebiten.KeyLeft: "Left",
ebiten.KeyRight: "Right",
ebiten.KeyUp: "Up",
// Mods
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ebiten.KeyShift: "Shift",
ebiten.KeyControl: "Ctrl",
ebiten.KeyAlt: "Alt",
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}
func update(screen *ebiten.Image) error {
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// Collect pressed keys' names.
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pressed := []string{}
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for i := 0; i <= 9; i++ {
if ebiten.IsKeyPressed(ebiten.Key(i) + ebiten.Key0) {
pressed = append(pressed, string(i+'0'))
}
}
for c := 'A'; c <= 'Z'; c++ {
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if ebiten.IsKeyPressed(ebiten.KeyA + ebiten.Key(c-'A')) {
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pressed = append(pressed, string(c))
}
}
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for i := 1; i <= 12; i++ {
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if ebiten.IsKeyPressed(ebiten.KeyF1 + ebiten.Key(i-1)) {
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pressed = append(pressed, "F"+strconv.Itoa(i))
}
}
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for key, name := range keyNames {
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if ebiten.IsKeyPressed(key) {
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pressed = append(pressed, name)
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}
}
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if ebiten.IsRunningSlowly() {
return nil
}
const (
offsetX = 24
offsetY = 40
)
// Draw the base (grayed) keyboard image.
op := &ebiten.DrawImageOptions{}
op.GeoM.Translate(offsetX, offsetY)
op.ColorM.Scale(0.5, 0.5, 0.5, 1)
screen.DrawImage(keyboardImage, op)
// Draw the highlighted keys.
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op = &ebiten.DrawImageOptions{}
for _, p := range pressed {
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)
op.SourceRect = &r
screen.DrawImage(keyboardImage, op)
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}
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return nil
}
func main() {
if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Keyboard (Ebiten Demo)"); err != nil {
log.Fatal(err)
}
}