mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-27 20:28:54 +01:00
74 lines
1.6 KiB
Go
74 lines
1.6 KiB
Go
// Copyright 2018 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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// +build example
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package main
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import (
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"fmt"
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"image/color"
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"log"
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"github.com/hajimehoshi/ebiten/v2"
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"github.com/hajimehoshi/ebiten/v2/ebitenutil"
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)
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var pointerImage = ebiten.NewImage(8, 8)
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func init() {
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pointerImage.Fill(color.RGBA{0xff, 0, 0, 0xff})
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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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type Game struct {
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x float64
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y float64
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}
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func (g *Game) Update() error {
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dx, dy := ebiten.Wheel()
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g.x += dx
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g.y += dy
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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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op := &ebiten.DrawImageOptions{}
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op.GeoM.Translate(g.x, g.y)
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op.GeoM.Translate(screenWidth/2, screenHeight/2)
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screen.DrawImage(pointerImage, op)
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ebitenutil.DebugPrint(screen,
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fmt.Sprintf("Move the red point by mouse wheel\n(%0.2f, %0.2f)", g.x, g.y))
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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{x: 0.0, y: 0.0}
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ebiten.SetWindowSize(screenWidth, screenHeight)
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ebiten.SetWindowTitle("Wheel (Ebiten 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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