集中線GIFメーカー in Golang
http://hitode909.hatenablog.com/entry/2015/09/13/205925
I wrote @hitode909's 集中線GIFメーカー(Awesome Web application) in Golang. This is command line application and you can use this as below.
Repository
https://github.com/syohex/speedline
Sample Output
Code
package main import ( "flag" "fmt" "math" "math/rand" "github.com/gographics/imagick/imagick" ) var ( output = flag.String("o", "output.gif", "output filename") color = flag.String("color", "black", "background color") ) func speedLine(mw *imagick.MagickWand, aw *imagick.MagickWand) error { cols, rows := mw.GetImageHeight(), mw.GetImageWidth() dw := imagick.NewDrawingWand() defer dw.Destroy() cw := imagick.NewPixelWand() cw.SetColor(*color) dw.SetFillColor(cw) center := []float64{float64(cols) / 2.0, float64(rows) / 2.0} const radiusCenter float64 = 0.75 const step float64 = 0.02 const bold float64 = 1.0 var theeta float64 for theeta < math.Pi*2 { stepNoise := rand.Float64() + 0.5 theeta += step * stepNoise radiusCenterNoise := rand.Float64()*0.3 + 1.0 boldNoise := rand.Float64() + 0.7 + 0.3 point0 := imagick.PointInfo{ X: math.Sin(theeta)*center[0]*radiusCenter*radiusCenterNoise + center[0], Y: math.Cos(theeta)*center[1]*radiusCenter*radiusCenterNoise + center[1], } point1 := imagick.PointInfo{ X: math.Sin(theeta)*center[0]*2 + center[0], Y: math.Cos(theeta)*center[1]*2 + center[1], } point2 := imagick.PointInfo{ X: math.Sin(theeta+step*bold*boldNoise)*center[0]*2 + center[0], Y: math.Cos(theeta+step*bold*boldNoise)*center[1]*2 + center[1], } dw.Polygon([]imagick.PointInfo{point0, point1, point2}) } if err := aw.DrawImage(dw); err != nil { return err } return nil } func main() { flag.Parse() imagick.Initialize() defer imagick.Terminate() mw := imagick.NewMagickWand() defer mw.Destroy() aw := imagick.NewMagickWand() defer aw.Destroy() if err := mw.ReadImage(flag.Arg(0)); err != nil { panic(err) } if int(mw.GetNumberImages()) == 1 { mw.SetIteratorIndex(0) first := mw.GetImage() mw.ResetIterator() for i := 0; i < 3; i++ { mw.AddImage(first.Clone()) } } for i := 0; i < int(mw.GetNumberImages()); i++ { mw.SetIteratorIndex(i) tw := mw.GetImage() aw.AddImage(tw) if err := speedLine(tw, aw); err != nil { fmt.Println(err) return } tw.Destroy() } mw.ResetIterator() aw.SetOption("loop", "0") if err := aw.WriteImages(*output, true); err != nil { panic(err) } }