ebiten/examples/set/main.go

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// Copyright 2019 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 (
"fmt"
"image/color"
"log"
"math/rand"
"time"
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"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/ebitenutil"
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)
const (
screenWidth = 320
screenHeight = 240
)
func init() {
rand.Seed(time.Now().UnixNano())
}
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type Game struct {
offscreen *ebiten.Image
}
func NewGame() *Game {
return &Game{
offscreen: ebiten.NewImage(screenWidth, screenHeight),
}
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}
func (g *Game) Update() error {
w, h := g.offscreen.Size()
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x := rand.Intn(w)
y := rand.Intn(h)
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c := color.RGBA{
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byte(rand.Intn(256)),
byte(rand.Intn(256)),
byte(rand.Intn(256)),
byte(0xff),
}
g.offscreen.Set(x, y, c)
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return nil
}
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func (g *Game) Draw(screen *ebiten.Image) {
screen.DrawImage(g.offscreen, nil)
ebitenutil.DebugPrint(screen, fmt.Sprintf("TPS: %0.2f\nFPS: %0.2f", ebiten.ActualTPS(), ebiten.ActualFPS()))
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}
func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
return screenWidth, screenHeight
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}
func main() {
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ebiten.SetWindowSize(screenWidth*2, screenHeight*2)
ebiten.SetWindowTitle("Set (Ebiten Demo)")
if err := ebiten.RunGame(NewGame()); err != nil {
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log.Fatal(err)
}
}