diff --git a/examples/physics/main.go b/examples/physics/main.go new file mode 100644 index 000000000..6248dd0f4 --- /dev/null +++ b/examples/physics/main.go @@ -0,0 +1,153 @@ +// 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" + "math/rand" + "os" + + "github.com/hajimehoshi/ebiten" + "github.com/hajimehoshi/ebiten/ebitenutil" + "github.com/jakecoffman/cp" +) + +const ( + imageWidth = 188 + imageHeight = 35 + imageRowLength = 24 +) + +var ( + space *cp.Space +) + +func main() { + 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{-1000, 225}) + body.SetVelocity(400, 0) + + shape = space.AddShape(cp.NewCircle(body, 8, cp.Vector{})) + shape.SetElasticity(0) + shape.SetFriction(0) + + err := ebiten.Run(update, 600, 480, 1, "Ebiten") + if err != nil { + fmt.Fprintln(os.Stderr, err) + } +} + +func getPixel(x, y uint) int { + return (imageBitmap[(x>>3)+y*imageRowLength] >> (^x & 0x7)) & 1 +} + +func update(screen *ebiten.Image) error { + space.Step(1. / 60.) + if ebiten.IsRunningSlowly() { + return nil + } + + screen.Fill(color.Black) + dot, _ := ebiten.NewImage(1, 1, ebiten.FilterNearest) + dot.Fill(color.White) + + op := &ebiten.DrawImageOptions{} + op.ColorM.Scale(200./255., 200./255., 200./255., 1) + + space.EachBody(func(body *cp.Body) { + op.GeoM.Reset() + op.GeoM.Translate(body.Position().X, body.Position().Y) + screen.DrawImage(dot, op) + }) + + ebitenutil.DebugPrint(screen, fmt.Sprint(ebiten.CurrentFPS())) + return nil +} + +func makeBall(x, y float64) *cp.Shape { + body := cp.NewBody(1.0, cp.INFINITY) + body.SetPosition(cp.Vector{x, y}) + + 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, + -4, 63, -1, -3, -1, -64, 9, -29, -32, 0, 7, -8, 127, -97, -25, -1, -2, 63, -8, 31, -4, -1, 15, -13, + -2, 63, -1, -3, -1, -64, 9, -29, -32, 0, 7, -8, 127, -97, -25, -1, -1, 63, -4, 63, -4, -1, 15, -13, + -2, 63, -33, -1, -1, -32, 9, -25, -32, 0, 7, -8, 127, -97, -25, -1, -1, 63, -4, 63, -4, -1, 15, -13, + -1, 63, -33, -1, -1, -16, 9, -25, -32, 0, 7, -8, 127, -97, -25, -1, -1, 63, -4, 63, -4, -1, 15, -13, + -1, 63, -49, -1, -1, -8, 9, -57, -32, 0, 7, -8, 127, -97, -25, -8, -1, 63, -2, 127, -4, -1, 15, -13, + -1, -65, -49, -1, -1, -4, 9, -57, -32, 0, 7, -8, 127, -97, -25, -8, -1, 63, -2, 127, -4, -1, 15, -13, + -1, -65, -57, -1, -1, -2, 9, -57, -32, 0, 7, -8, 127, -97, -25, -8, -1, 63, -2, 127, -4, -1, 15, -13, + -1, -1, -57, -1, -1, -1, 9, -57, -32, 0, 7, -1, -1, -97, -25, -8, -1, 63, -1, -1, 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-4, 0, 15, -17, -1, -1, -25, -8, 127, -97, + -25, -8, 0, 63, -57, -29, -4, -1, -1, -13, -4, -1, -64, 31, -2, 0, 0, 103, -1, -1, -57, -8, 127, -97, + -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, +}