mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-15 07:27:32 +01:00
133 lines
3.3 KiB
Go
133 lines
3.3 KiB
Go
// Copyright 2023 The Ebitengine 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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"fmt"
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"image/color"
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"log"
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"runtime"
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"sync"
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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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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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initOnce sync.Once
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mouseX int
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mouseY int
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x int
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y int
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}
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func (g *Game) Update() error {
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g.initOnce.Do(func() {
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// initialize cursor position on first update
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g.mouseX, g.mouseY = ebiten.CursorPosition()
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})
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if ebiten.CursorMode() == ebiten.CursorModeCaptured {
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cursorX, cursorY := ebiten.CursorPosition()
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deltaX, deltaY := cursorX-g.mouseX, cursorY-g.mouseY
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g.mouseX, g.mouseY = cursorX, cursorY
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if deltaX != 0 {
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g.x += deltaX
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}
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if deltaY != 0 {
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g.y += deltaY
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}
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// Constrain red dot within screen view.
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if g.x < 0 {
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g.x = 0
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} else if g.x > screenWidth-pointerImage.Bounds().Dx() {
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g.x = screenWidth - pointerImage.Bounds().Dx()
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}
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if g.y < 0 {
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g.y = 0
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} else if g.y > screenHeight-pointerImage.Bounds().Dy() {
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g.y = screenHeight - pointerImage.Bounds().Dy()
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}
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}
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if inpututil.IsKeyJustPressed(ebiten.KeySpace) {
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if ebiten.CursorMode() == ebiten.CursorModeCaptured {
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// Release mouse cursor capture.
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ebiten.SetCursorMode(ebiten.CursorModeVisible)
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} else {
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// Recapture mouse cursor.
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ebiten.SetCursorMode(ebiten.CursorModeCaptured)
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// Reset mouse cursor position for its return.
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g.mouseX, g.mouseY = ebiten.CursorPosition()
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}
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}
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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(float64(g.x), float64(g.y))
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screen.DrawImage(pointerImage, op)
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var message string
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if ebiten.CursorMode() == ebiten.CursorModeCaptured {
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message = fmt.Sprintf("Move the red point with mouse captured\nPress Space to release mouse capture\n(%d, %d)", g.x, g.y)
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} else {
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message = fmt.Sprintf("The red point can only move when mouse captured\nPress Space to capture mouse\n(%d, %d)", g.x, g.y)
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}
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ebitenutil.DebugPrint(screen, message)
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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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ebiten.SetWindowTitle("Mouse Capture (Ebitengine Demo)")
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ebiten.SetWindowSize(screenWidth, screenHeight)
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// Web browsers allow cursor mode capture only with user interaction.
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// Start without cursor captured with message indicating how to capture.
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if runtime.GOOS != "js" {
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ebiten.SetCursorMode(ebiten.CursorModeCaptured)
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}
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g := &Game{
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x: screenWidth / 2,
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y: screenHeight / 2,
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}
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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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