mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-09 20:47:26 +01:00
85 lines
2.5 KiB
Go
85 lines
2.5 KiB
Go
// Copyright 2022 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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"log"
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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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type pos struct {
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x int
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y int
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}
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type Game struct {
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releasedTouchIDs []ebiten.TouchID
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lastTouchPositions []pos
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}
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func (g *Game) Update() error {
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// In general, Append* function allocates a new slice if the given slice doesn't have enough capacity,
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// or otherwise, just extends the length of the given slice.
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//
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// This example passes an empty slice that might have a capacity in order to reduce the chances of slice allocations.
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// You can also pass 'nil' to AppendJustReleasedTouchIDs if you don't care the cost of creating slices.
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// In this case, AppendJustReleasedTouchIDs would always create a new slice.
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g.releasedTouchIDs = inpututil.AppendJustReleasedTouchIDs(g.releasedTouchIDs[:0])
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for _, id := range g.releasedTouchIDs {
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// Get the last position of the touch.
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// ebiten.TouchPosition would not work as the touch has already gone in this tick.
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x, y := inpututil.TouchPositionInPreviousTick(id)
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g.lastTouchPositions = append(g.lastTouchPositions, pos{x: x, y: y})
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}
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const n = 10
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if len(g.lastTouchPositions) > n {
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copy(g.lastTouchPositions, g.lastTouchPositions[len(g.lastTouchPositions)-n:])
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g.lastTouchPositions = g.lastTouchPositions[:n]
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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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msg := "Touch the screen and release your finger from it.\n\nLast Positions:\n"
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for _, p := range g.lastTouchPositions {
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msg += fmt.Sprintf(" (%d, %d)\n", p.x, p.y)
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}
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ebitenutil.DebugPrint(screen, msg)
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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.SetWindowSize(screenWidth, screenHeight)
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ebiten.SetWindowTitle("Last Touch Positions (Ebitengine Demo)")
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if err := ebiten.RunGame(&Game{}); err != nil {
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log.Fatal(err)
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}
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}
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