ebiten/examples/typewriter/main.go

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// Copyright 2017 The Ebiten Authors
//
// 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.
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//go:build example
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// +build example
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package main
import (
"log"
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"strings"
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"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/ebitenutil"
"github.com/hajimehoshi/ebiten/v2/inpututil"
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)
const (
screenWidth = 640
screenHeight = 480
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)
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// repeatingKeyPressed return true when key is pressed considering the repeat state.
func repeatingKeyPressed(key ebiten.Key) bool {
const (
delay = 30
interval = 3
)
d := inpututil.KeyPressDuration(key)
if d == 1 {
return true
}
if d >= delay && (d-delay)%interval == 0 {
return true
}
return false
}
type Game struct {
runes []rune
text string
counter int
}
func (g *Game) Update() error {
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// Add runes that are input by the user by AppendInputChars.
// Note that AppendInputChars result changes every frame, so you need to call this
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// every frame.
g.runes = ebiten.AppendInputChars(g.runes[:0])
g.text += string(g.runes)
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// Adjust the string to be at most 10 lines.
ss := strings.Split(g.text, "\n")
if len(ss) > 10 {
g.text = strings.Join(ss[len(ss)-10:], "\n")
}
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// If the enter key is pressed, add a line break.
if repeatingKeyPressed(ebiten.KeyEnter) || repeatingKeyPressed(ebiten.KeyNumpadEnter) {
g.text += "\n"
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}
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// If the backspace key is pressed, remove one character.
if repeatingKeyPressed(ebiten.KeyBackspace) {
if len(g.text) >= 1 {
g.text = g.text[:len(g.text)-1]
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}
}
g.counter++
return nil
}
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func (g *Game) Draw(screen *ebiten.Image) {
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// Blink the cursor.
t := g.text
if g.counter%60 < 30 {
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t += "_"
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}
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ebitenutil.DebugPrint(screen, t)
}
func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
return screenWidth, screenHeight
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}
func main() {
g := &Game{
text: "Type on the keyboard:\n",
counter: 0,
}
ebiten.SetWindowSize(screenWidth, screenHeight)
ebiten.SetWindowTitle("TypeWriter (Ebiten Demo)")
if err := ebiten.RunGame(g); err != nil {
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log.Fatal(err)
}
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}