ebiten/examples/chipmunk/main.go

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// Copyright 2018 The Ebiten Authors
//
// 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.
// +build example jsgo
package main
import (
"fmt"
"image/color"
"log"
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"math/rand"
"github.com/hajimehoshi/ebiten"
"github.com/hajimehoshi/ebiten/ebitenutil"
"github.com/jakecoffman/cp"
)
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const (
screenWidth = 600
screenHeight = 480
)
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var (
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dot *ebiten.Image
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)
func init() {
dot, _ = ebiten.NewImage(1, 1, ebiten.FilterDefault)
dot.Fill(color.White)
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}
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type Game struct {
space *cp.Space
}
func NewGame() *Game {
const (
imageWidth = 188
imageHeight = 35
)
space := cp.NewSpace()
space.Iterations = 1
// The space will contain a very large number of similarly sized objects.
// This is the perfect candidate for using the spatial hash.
// Generally you will never need to do this.
space.UseSpatialHash(2.0, 10000)
var body *cp.Body
var shape *cp.Shape
for y := 0; y < imageHeight; y++ {
for x := 0; x < imageWidth; x++ {
if getPixel(uint(x), uint(y)) == 0 {
continue
}
xJitter := 0.05 * rand.Float64()
yJitter := 0.05 * rand.Float64()
shape = makeBall(2.0*(float64(x)+imageWidth/2+xJitter)-75, 2*(imageHeight/2.0+float64(y)+yJitter)+150)
space.AddBody(shape.Body())
space.AddShape(shape)
}
}
body = space.AddBody(cp.NewBody(1e9, cp.INFINITY))
body.SetPosition(cp.Vector{X: -1000, Y: 225})
body.SetVelocity(400, 0)
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shape = space.AddShape(cp.NewCircle(body, 8, cp.Vector{}))
shape.SetElasticity(0)
shape.SetFriction(0)
return &Game{
space: space,
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}
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}
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func (g *Game) Update(screen *ebiten.Image) error {
g.space.Step(1.0 / float64(ebiten.MaxTPS()))
return nil
}
func (g *Game) Draw(screen *ebiten.Image) {
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screen.Fill(color.Black)
op := &ebiten.DrawImageOptions{}
op.ColorM.Scale(200.0/255.0, 200.0/255.0, 200.0/255.0, 1)
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g.space.EachBody(func(body *cp.Body) {
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op.GeoM.Reset()
op.GeoM.Translate(body.Position().X, body.Position().Y)
screen.DrawImage(dot, op)
})
ebitenutil.DebugPrint(screen, fmt.Sprintf("TPS: %0.2f", ebiten.CurrentTPS()))
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}
func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
return screenWidth, screenHeight
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}
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func getPixel(x, y uint) int {
const imageRowLength = 24
return (imageBitmap[(x>>3)+y*imageRowLength] >> (^x & 0x7)) & 1
}
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func makeBall(x, y float64) *cp.Shape {
body := cp.NewBody(1.0, cp.INFINITY)
body.SetPosition(cp.Vector{X: x, Y: y})
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shape := cp.NewCircle(body, 0.95, cp.Vector{})
shape.SetElasticity(0)
shape.SetFriction(0)
return shape
}
var imageBitmap = []int{
15, -16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, -64, 15, 63, -32, -2, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 31, -64, 15, 127, -125, -1, -128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 127, -64, 15, 127, 15, -1, -64, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, -1, -64, 15, -2,
31, -1, -64, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, -1, -64, 0, -4, 63, -1, -32, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, -1, -64, 15, -8, 127, -1, -32, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, -1, -64, 0, -8, -15, -1, -32, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, -31, -1, -64, 15, -8, -32,
-1, -32, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, -15, -1, -64, 9, -15, -32, -1, -32, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 31, -15, -1, -64, 0, -15, -32, -1, -32, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 63, -7, -1, -64, 9, -29, -32, 127, -61, -16, 63, 15, -61, -1, -8, 31, -16, 15, -8, 126, 7, -31,
-8, 31, -65, -7, -1, -64, 9, -29, -32, 0, 7, -8, 127, -97, -25, -1, -2, 63, -8, 31, -4, -1, 15, -13,
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-4, -1, 15, -13, -1, -1, -64, 127, -7, -1, -119, -17, -15, -1, -25, -8, 127, -97, -25, -1, -2, 63,
-49, -13, -4, -1, 15, -13, -3, -1, -64, 127, -8, -2, 15, -17, -1, -1, -25, -8, 127, -97, -25, -1,
-8, 63, -49, -13, -4, -1, 15, -13, -3, -1, -64, 63, -4, 120, 0, -17, -1, -1, -25, -8, 127, -97, -25,
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-25, -8, 0, 63, -57, -29, -4, -1, -1, -13, -4, 127, -64, 31, -2, 0, 15, 103, -1, -1, -57, -8, 127,
-97, -25, -8, 0, 63, -61, -61, -4, 127, -1, -29, -4, 127, -64, 15, -8, 0, 0, 55, -1, -1, -121, -8,
127, -97, -25, -8, 0, 63, -61, -61, -4, 127, -1, -29, -4, 63, -64, 15, -32, 0, 0, 23, -1, -2, 3, -16,
63, 15, -61, -16, 0, 31, -127, -127, -8, 31, -1, -127, -8, 31, -128, 7, -128, 0, 0,
}
func main() {
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ebiten.SetWindowSize(screenWidth, screenHeight)
ebiten.SetWindowTitle("Ebiten")
if err := ebiten.RunGame(NewGame()); err != nil {
log.Fatal(err)
}
}