mirror of
https://github.com/hajimehoshi/ebiten.git
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107 lines
2.4 KiB
Go
107 lines
2.4 KiB
Go
// Copyright 2017 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"log"
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"strings"
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"github.com/hajimehoshi/ebiten/v2"
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"github.com/hajimehoshi/ebiten/v2/ebitenutil"
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"github.com/hajimehoshi/ebiten/v2/inpututil"
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)
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const (
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screenWidth = 640
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screenHeight = 480
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)
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// repeatingKeyPressed return true when key is pressed considering the repeat state.
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func repeatingKeyPressed(key ebiten.Key) bool {
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const (
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delay = 30
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interval = 3
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)
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d := inpututil.KeyPressDuration(key)
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if d == 1 {
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return true
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}
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if d >= delay && (d-delay)%interval == 0 {
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return true
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}
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return false
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}
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type Game struct {
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runes []rune
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text string
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counter int
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}
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func (g *Game) Update() error {
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// Add runes that are input by the user by AppendInputChars.
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// Note that AppendInputChars result changes every frame, so you need to call this
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// every frame.
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g.runes = ebiten.AppendInputChars(g.runes[:0])
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g.text += string(g.runes)
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// Adjust the string to be at most 10 lines.
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ss := strings.Split(g.text, "\n")
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if len(ss) > 10 {
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g.text = strings.Join(ss[len(ss)-10:], "\n")
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}
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// If the enter key is pressed, add a line break.
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if repeatingKeyPressed(ebiten.KeyEnter) || repeatingKeyPressed(ebiten.KeyNumpadEnter) {
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g.text += "\n"
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}
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// If the backspace key is pressed, remove one character.
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if repeatingKeyPressed(ebiten.KeyBackspace) {
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if len(g.text) >= 1 {
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g.text = g.text[:len(g.text)-1]
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}
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}
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g.counter++
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return nil
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}
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func (g *Game) Draw(screen *ebiten.Image) {
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// Blink the cursor.
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t := g.text
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if g.counter%60 < 30 {
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t += "_"
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}
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ebitenutil.DebugPrint(screen, t)
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}
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func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
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return screenWidth, screenHeight
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}
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func main() {
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g := &Game{
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text: "Type on the keyboard:\n",
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counter: 0,
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}
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ebiten.SetWindowSize(screenWidth, screenHeight)
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ebiten.SetWindowTitle("TypeWriter (Ebitengine Demo)")
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if err := ebiten.RunGame(g); err != nil {
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log.Fatal(err)
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}
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}
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