From e7da74e9743f449d7d66cfac1f66fa110b2a38cd Mon Sep 17 00:00:00 2001 From: Ben Cragg Date: Wed, 10 Apr 2019 11:26:34 +0100 Subject: [PATCH] Added line collisions example --- community/line-collisions/main.go | 99 +++++++++++++++++++++++++++++++ 1 file changed, 99 insertions(+) create mode 100644 community/line-collisions/main.go diff --git a/community/line-collisions/main.go b/community/line-collisions/main.go new file mode 100644 index 0000000..46b6fbf --- /dev/null +++ b/community/line-collisions/main.go @@ -0,0 +1,99 @@ +package main + +import ( + "image/color" + + "github.com/faiface/pixel" + "github.com/faiface/pixel/imdraw" + "github.com/faiface/pixel/pixelgl" +) + +const ( + modeR = iota + modeL +) + +const ( + clickLineA = iota + clickLineB +) + +var ( + winBounds = pixel.R(0, 0, 1024, 768) + + r = pixel.R(10, 10, 70, 50) + l = pixel.L(pixel.V(20, 20), pixel.V(100, 30)) + + mode = modeR + clickLine = clickLineA +) + +func run() { + cfg := pixelgl.WindowConfig{ + Title: "Line collision", + Bounds: winBounds, + VSync: true, + } + + win, err := pixelgl.NewWindow(cfg) + if err != nil { + panic(err) + } + + imd := imdraw.New(nil) + + for !win.Closed() { + if mode == modeR { + win.Clear(color.RGBA{R: 23, G: 39, B: 58, A: 125}) + } else { + win.Clear(color.RGBA{R: 21, G: 55, B: 18, A: 125}) + } + imd.Clear() + + if win.JustPressed(pixelgl.KeyR) { + mode = modeR + } + if win.JustPressed(pixelgl.KeyL) { + mode = modeL + clickLine = clickLineA + } + + if win.JustPressed(pixelgl.MouseButtonLeft) { + if mode == modeR { + rectToMouse := r.Center().To(win.MousePosition()) + r = r.Moved(rectToMouse) + } + + if mode == modeL { + if clickLine == clickLineA { + l = pixel.L(win.MousePosition(), win.MousePosition().Add(pixel.V(1, 1))) + clickLine = clickLineB + } else { + l = pixel.L(l.A, win.MousePosition()) + clickLine = clickLineA + } + } + } + + imd.Color = color.Black + imd.Push(r.Min, r.Max) + imd.Rectangle(3) + + imd.Color = color.RGBA{R: 10, G: 10, B: 250, A: 255} + imd.Push(l.A, l.B) + imd.Line(3) + + imd.Color = color.RGBA{R: 250, G: 10, B: 10, A: 255} + for _, i := range r.IntersectionPoints(l) { + imd.Push(i) + imd.Circle(4, 0) + } + + imd.Draw(win) + win.Update() + } +} + +func main() { + pixelgl.Run(run) +}