ebiten/examples/typewriter/main.go
2018-03-15 01:26:21 +09:00

79 lines
1.9 KiB
Go

// 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.
// +build example jsgo
package main
import (
"log"
"strings"
"github.com/hajimehoshi/ebiten"
"github.com/hajimehoshi/ebiten/ebitenutil"
)
var (
text = "Type on the keyboard:\n"
counter = 0
bsPrevPressed = false
)
func update(screen *ebiten.Image) error {
// Add a string from InputChars, that returns string input by users.
// Note that InputChars result changes every frame, so you need to call this
// every frame.
text += string(ebiten.InputChars())
// Adjust the string to be at most 10 lines.
ss := strings.Split(text, "\n")
if len(ss) > 10 {
text = strings.Join(ss[len(ss)-10:], "\n")
}
// If the enter key is pressed, add a line break.
if ebiten.IsKeyPressed(ebiten.KeyEnter) && !strings.HasSuffix(text, "\n") {
text += "\n"
}
// If the backspace key is pressed, remove one character.
bsPressed := ebiten.IsKeyPressed(ebiten.KeyBackspace)
if !bsPrevPressed && bsPressed {
if len(text) >= 1 {
text = text[:len(text)-1]
}
}
bsPrevPressed = bsPressed
counter++
if ebiten.IsRunningSlowly() {
return nil
}
// Blink the cursor.
t := text
if counter%60 < 30 {
t += "_"
}
ebitenutil.DebugPrint(screen, t)
return nil
}
func main() {
if err := ebiten.Run(update, 320, 240, 2.0, "Typewriter (Ebiten Demo)"); err != nil {
log.Fatal(err)
}
}