mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-27 04:08:53 +01:00
151 lines
3.1 KiB
Go
151 lines
3.1 KiB
Go
// Copyright 2014 Hajime Hoshi
|
|
//
|
|
// 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.
|
|
|
|
package main
|
|
|
|
import (
|
|
"fmt"
|
|
"image"
|
|
"image/color"
|
|
"log"
|
|
"math"
|
|
|
|
"github.com/hajimehoshi/ebiten/v2"
|
|
"github.com/hajimehoshi/ebiten/v2/colorm"
|
|
"github.com/hajimehoshi/ebiten/v2/ebitenutil"
|
|
)
|
|
|
|
const (
|
|
screenWidth = 640
|
|
screenHeight = 480
|
|
)
|
|
|
|
var (
|
|
brushImage *ebiten.Image
|
|
)
|
|
|
|
func init() {
|
|
const (
|
|
a0 = 0x40
|
|
a1 = 0xc0
|
|
a2 = 0xff
|
|
)
|
|
pixels := []uint8{
|
|
a0, a1, a1, a0,
|
|
a1, a2, a2, a1,
|
|
a1, a2, a2, a1,
|
|
a0, a1, a1, a0,
|
|
}
|
|
brushImage = ebiten.NewImageFromImage(&image.Alpha{
|
|
Pix: pixels,
|
|
Stride: 4,
|
|
Rect: image.Rect(0, 0, 4, 4),
|
|
})
|
|
}
|
|
|
|
type touch struct {
|
|
id ebiten.TouchID
|
|
pos pos
|
|
}
|
|
|
|
type pos struct {
|
|
x int
|
|
y int
|
|
}
|
|
|
|
type Game struct {
|
|
cursor pos
|
|
touches []touch
|
|
count int
|
|
|
|
canvasImage *ebiten.Image
|
|
}
|
|
|
|
func NewGame() *Game {
|
|
g := &Game{
|
|
canvasImage: ebiten.NewImage(screenWidth, screenHeight),
|
|
}
|
|
g.canvasImage.Fill(color.White)
|
|
return g
|
|
}
|
|
|
|
func (g *Game) Update() error {
|
|
drawn := false
|
|
|
|
// Paint the brush by mouse dragging
|
|
mx, my := ebiten.CursorPosition()
|
|
if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
|
|
g.paint(g.canvasImage, mx, my)
|
|
drawn = true
|
|
}
|
|
g.cursor = pos{
|
|
x: mx,
|
|
y: my,
|
|
}
|
|
|
|
// Paint the brush by touches
|
|
g.touches = g.touches[:0]
|
|
for _, id := range ebiten.AppendTouchIDs(nil) {
|
|
x, y := ebiten.TouchPosition(id)
|
|
g.paint(g.canvasImage, x, y)
|
|
g.touches = append(g.touches, touch{
|
|
id: id,
|
|
pos: pos{
|
|
x: x,
|
|
y: y,
|
|
},
|
|
})
|
|
drawn = true
|
|
}
|
|
if drawn {
|
|
g.count++
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// paint draws the brush on the given canvas image at the position (x, y).
|
|
func (g *Game) paint(canvas *ebiten.Image, x, y int) {
|
|
op := &colorm.DrawImageOptions{}
|
|
op.GeoM.Translate(float64(x), float64(y))
|
|
var cm colorm.ColorM
|
|
// Scale the color and rotate the hue so that colors vary on each frame.
|
|
cm.Scale(1.0, 0.50, 0.125, 1.0)
|
|
tps := ebiten.TPS()
|
|
theta := 2.0 * math.Pi * float64(g.count%tps) / float64(tps)
|
|
cm.RotateHue(theta)
|
|
colorm.DrawImage(canvas, brushImage, cm, op)
|
|
}
|
|
|
|
func (g *Game) Draw(screen *ebiten.Image) {
|
|
screen.DrawImage(g.canvasImage, nil)
|
|
|
|
msg := fmt.Sprintf("(%d, %d)", g.cursor.x, g.cursor.y)
|
|
for _, t := range g.touches {
|
|
msg += fmt.Sprintf("\n(%d, %d) touch %d", t.pos.x, t.pos.y, t.id)
|
|
}
|
|
ebitenutil.DebugPrint(screen, msg)
|
|
}
|
|
|
|
func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
|
|
return screenWidth, screenHeight
|
|
}
|
|
|
|
func main() {
|
|
ebiten.SetWindowSize(screenWidth, screenHeight)
|
|
ebiten.SetWindowTitle("Paint (Ebitengine Demo)")
|
|
if err := ebiten.RunGame(NewGame()); err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
}
|