mirror of
https://github.com/hajimehoshi/ebiten.git
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151 lines
3.0 KiB
Go
151 lines
3.0 KiB
Go
// Copyright 2014 Hajime Hoshi
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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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//go:build example
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package main
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import (
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"fmt"
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"image"
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"image/color"
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"log"
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"math"
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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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const (
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screenWidth = 640
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screenHeight = 480
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)
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var (
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brushImage *ebiten.Image
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)
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func init() {
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const (
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a0 = 0x40
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a1 = 0xc0
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a2 = 0xff
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)
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pixels := []uint8{
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a0, a1, a1, a0,
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a1, a2, a2, a1,
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a1, a2, a2, a1,
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a0, a1, a1, a0,
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}
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brushImage = ebiten.NewImageFromImage(&image.Alpha{
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Pix: pixels,
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Stride: 4,
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Rect: image.Rect(0, 0, 4, 4),
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})
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}
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type touch struct {
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id ebiten.TouchID
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pos pos
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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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cursor pos
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touches []touch
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count int
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canvasImage *ebiten.Image
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}
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func NewGame() *Game {
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g := &Game{
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canvasImage: ebiten.NewImage(screenWidth, screenHeight),
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}
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g.canvasImage.Fill(color.White)
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return g
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}
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func (g *Game) Update() error {
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drawn := false
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// Paint the brush by mouse dragging
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mx, my := ebiten.CursorPosition()
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if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
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g.paint(g.canvasImage, mx, my)
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drawn = true
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}
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g.cursor = pos{
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x: mx,
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y: my,
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}
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// Paint the brush by touches
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g.touches = g.touches[:0]
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for _, id := range ebiten.AppendTouchIDs(nil) {
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x, y := ebiten.TouchPosition(id)
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g.paint(g.canvasImage, x, y)
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g.touches = append(g.touches, touch{
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id: id,
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pos: pos{
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x: x,
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y: y,
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},
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})
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drawn = true
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}
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if drawn {
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g.count++
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}
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return nil
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}
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// paint draws the brush on the given canvas image at the position (x, y).
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func (g *Game) paint(canvas *ebiten.Image, x, y int) {
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op := &ebiten.DrawImageOptions{}
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op.GeoM.Translate(float64(x), float64(y))
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// Scale the color and rotate the hue so that colors vary on each frame.
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op.ColorM.Scale(1.0, 0.50, 0.125, 1.0)
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tps := ebiten.TPS()
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theta := 2.0 * math.Pi * float64(g.count%tps) / float64(tps)
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op.ColorM.RotateHue(theta)
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canvas.DrawImage(brushImage, op)
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}
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func (g *Game) Draw(screen *ebiten.Image) {
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screen.DrawImage(g.canvasImage, nil)
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msg := fmt.Sprintf("(%d, %d)", g.cursor.x, g.cursor.y)
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for _, t := range g.touches {
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msg += fmt.Sprintf("\n(%d, %d) touch %d", t.pos.x, t.pos.y, t.id)
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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("Paint (Ebitengine Demo)")
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if err := ebiten.RunGame(NewGame()); err != nil {
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log.Fatal(err)
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}
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}
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