95 lines
2.5 KiB
Go
95 lines
2.5 KiB
Go
package tins2021
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import (
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"image"
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"github.com/llgcode/draw2d/draw2dimg"
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"opslag.de/schobers/geom"
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)
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const TextureSize = 128
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func CreateHeart() geom.PolygonF {
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var polygon geom.PolygonF
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const segments = 100
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for segment := 0; segment < 100; segment++ {
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t := 2 * geom.Pi * float64(segment) / segments
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st := geom.Sin(t)
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polygon.Points = append(polygon.Points, geom.PtF(
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16*st*st*st,
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13*geom.Cos(t)-5*geom.Cos(2*t)-2*geom.Cos(3*t)-geom.Cos(4*t)))
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}
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return polygon.Reverse().Mul(1. / 16)
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}
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func CreateHexagon() geom.PolygonF {
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var polygon geom.PolygonF
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pt := func(rotation float64) geom.PointF {
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a := .5*geom.Pi + 2*geom.Pi*rotation
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return geom.PtF(geom.Cos(a), geom.Sin(a))
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}
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const sides = 6
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for side := 0; side < 6; side++ {
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polygon.Points = append(polygon.Points,
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pt(float64(side)/float64(sides)),
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)
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}
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return polygon
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}
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func CreateStar(sides int) geom.PolygonF {
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var polygon geom.PolygonF
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pt := func(rotation float64) geom.PointF {
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a := .5*geom.Pi + 2*geom.Pi*rotation
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return geom.PtF(geom.Cos(a), geom.Sin(a))
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}
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for side := 0; side < sides; side++ {
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polygon.Points = append(polygon.Points,
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pt(float64(side)/float64(sides)),
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pt((float64(side)+0.5)/float64(sides)).Mul(.5),
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)
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}
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return polygon
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}
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func RenderPolygon2D(polygon geom.PolygonF, hexColor string) image.Image {
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im := image.NewRGBA(image.Rect(0, 0, TextureSize, TextureSize))
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color := mustHexColor(hexColor)
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gc := draw2dimg.NewGraphicContext(im)
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fillStrokeToGC(gc, color, polygon.Points...)
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return im
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}
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func RenderTriangles2D(triangles []geom.TriangleF, hexColor string) image.Image {
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im := image.NewRGBA(image.Rect(0, 0, TextureSize, TextureSize))
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color := mustHexColor(hexColor)
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gc := draw2dimg.NewGraphicContext(im)
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for _, triangle := range triangles {
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strokeToGC(gc, color, triangle.Points[:]...)
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}
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return im
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}
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func RenderTriangleSides2D(triangles []geom.TriangleF) image.Image {
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im := image.NewRGBA(image.Rect(0, 0, TextureSize, TextureSize))
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r, g, b := mustHexColor(`#FF0000`), mustHexColor(`#00FF00`), mustHexColor(`#0000FF`)
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gc := draw2dimg.NewGraphicContext(im)
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gc.SetLineWidth(2)
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for _, triangle := range triangles {
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inset := triangle.Inset(5)
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gc.SetStrokeColor(r)
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gc.MoveTo(inset.Points[0].XY())
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gc.LineTo(inset.Points[1].XY())
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gc.Stroke()
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gc.SetStrokeColor(g)
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gc.MoveTo(inset.Points[1].XY())
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gc.LineTo(inset.Points[2].XY())
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gc.Stroke()
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gc.SetStrokeColor(b)
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gc.MoveTo(inset.Points[2].XY())
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gc.LineTo(inset.Points[0].XY())
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gc.Stroke()
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}
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return im
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}
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