37 lines
842 B
Go
37 lines
842 B
Go
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package generativeart
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import (
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"github.com/fogleman/gg"
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"math"
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)
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type pointRibbon struct {
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r float64
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}
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// NewPointRibbon returns a pointRibbon object.
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func NewPointRibbon(r float64) *pointRibbon {
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return &pointRibbon{
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r: r,
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}
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}
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// Generative draws a point ribbon image.
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// TODO: make the point as parameters.
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func (s *pointRibbon) Generative(c *canva) {
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ctex := gg.NewContextForRGBA(c.img)
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ctex.SetLineWidth(c.opts.lineWidth)
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var t float64
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var dt = 0.0001
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for i := 0; i < c.opts.nIters; i++ {
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delta := 2.0*s.r*math.Cos(4.0*dt*t) + s.r*math.Cos(t)
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ctex.SetRGBA255(int(delta), int(2*s.r*math.Sin(t)-s.r*math.Cos(3*dt*t)), 100, 10)
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ctex.DrawPoint(2*s.r*math.Sin(2*t*dt)+s.r*math.Cos(t*dt)+float64(c.width/2),
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2*s.r*math.Sin(t*dt)-s.r*math.Sin(5*t)+float64(c.height/2), 1.0)
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ctex.Stroke()
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t += 0.01
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dt += 0.1
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}
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}
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