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add more control for domain warping

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This commit is contained in:
Yongwei Xing 2021-03-30 17:10:04 +08:00
parent 471e3eb992
commit ed10f4403d
3 changed files with 14 additions and 12 deletions
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6
README.md
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@ -122,7 +122,7 @@ NewCircleNoise(dotsN, colorMin, colorMax int)
NewYarn(n int) NewYarn(n int)
NewBlackHole(circleN int, density, circleGap float64) NewBlackHole(circleN int, density, circleGap float64)
NewColorCanve(seg float64) NewColorCanve(seg float64)
NewDomainWrap(scale, xOffset, yOffset float64, cmap ColorMapping) NewDomainWrap(scale, scale2, xOffset, yOffset float64, cmap ColorMapping)
``` ```
## Docs ## Docs
@ -422,7 +422,7 @@ func main() {
```go ```go
func cmap(r, m1, m2 float64) color.RGBA { func cmap(r, m1, m2 float64) color.RGBA {
rgb := color.RGBA{ rgb := color.RGBA{
uint8(common.Constrain(m1*255*r, 0, 255)), uint8(common.Constrain(m1*200*r, 0, 255)),
uint8(common.Constrain(r*200, 0, 255)), uint8(common.Constrain(r*200, 0, 255)),
uint8(common.Constrain(m2*255*r, 70, 255)), uint8(common.Constrain(m2*255*r, 70, 255)),
255, 255,
@ -435,7 +435,7 @@ func main() {
c := generativeart.NewCanva(500, 500) c := generativeart.NewCanva(500, 500)
c.SetBackground(common.Black) c.SetBackground(common.Black)
c.FillBackground() c.FillBackground()
c.Draw(arts.NewDomainWrap(0.01, 4, 8, cmap)) c.Draw(arts.NewDomainWrap(0.01, 4,4, 20, cmap))
c.ToPNG("domainwarp.png") c.ToPNG("domainwarp.png")
} }
``` ```

10
arts/domainwrap.go
View file

@ -12,14 +12,16 @@ type ColorMapping func(float64, float64, float64) color.RGBA
type domainWrap struct { type domainWrap struct {
noise *common.PerlinNoise noise *common.PerlinNoise
scale float64 scale float64
scale2 float64
xOffset, yOffset float64 xOffset, yOffset float64
fn ColorMapping fn ColorMapping
} }
// NewDomainWrap returns a domainWrap object. // NewDomainWrap returns a domainWrap object.
func NewDomainWrap(scale, xOffset, yOffset float64, cmap ColorMapping) *domainWrap { func NewDomainWrap(scale, scale2, xOffset, yOffset float64, cmap ColorMapping) *domainWrap {
return &domainWrap{ return &domainWrap{
scale: scale, scale: scale,
scale2: scale2,
xOffset: xOffset, xOffset: xOffset,
yOffset: yOffset, yOffset: yOffset,
noise: common.NewPerlinNoise(), noise: common.NewPerlinNoise(),
@ -43,10 +45,10 @@ func (d *domainWrap) pattern(x, y, xOffest, yOffset float64) (float64, float64,
qx := d.fbm(x+xOffest, y+yOffset) qx := d.fbm(x+xOffest, y+yOffset)
qy := d.fbm(x+xOffest+5.2, y+yOffset+1.3) qy := d.fbm(x+xOffest+5.2, y+yOffset+1.3)
rx := d.fbm(x+4.0*qx+1.7, y+4.0*qy+9.2) rx := d.fbm(x+d.scale2*qx+1.7, y+d.scale2*qy+9.2)
ry := d.fbm(x+4.0*qx+8.3, y+4.0*qy+2.8) ry := d.fbm(x+d.scale2*qx+8.3, y+d.scale2*qy+2.8)
return d.fbm(qx+4*rx, qy+4*ry), common.Magnitude(qx, qy), common.Magnitude(rx, ry) return d.fbm(qx+d.scale2*rx, qy+d.scale2*ry), common.Magnitude(qx, qy), common.Magnitude(rx, ry)
} }
func (d *domainWrap) fbm(x, y float64) float64 { func (d *domainWrap) fbm(x, y float64) float64 {

10
example/example_domainwrap.go
View file

@ -11,10 +11,10 @@ import (
func cmap(r, m1, m2 float64) color.RGBA { func cmap(r, m1, m2 float64) color.RGBA {
rgb := color.RGBA{ rgb := color.RGBA{
uint8(common.Constrain(m1*255*r, 0, 255)), R: uint8(common.Constrain(m1*200*r, 0, 255)),
uint8(common.Constrain(r*200, 0, 255)), G: uint8(common.Constrain(r*200, 0, 255)),
uint8(common.Constrain(m2*255*r, 70, 255)), B: uint8(common.Constrain(m2*255*r, 70, 255)),
255, A: 255,
} }
return rgb return rgb
} }
@ -24,6 +24,6 @@ func main() {
c := generativeart.NewCanva(500, 500) c := generativeart.NewCanva(500, 500)
c.SetBackground(common.Black) c.SetBackground(common.Black)
c.FillBackground() c.FillBackground()
c.Draw(arts.NewDomainWrap(0.01, 4, 8, cmap)) c.Draw(arts.NewDomainWrap(0.01, 4,4, 20, cmap))
c.ToPNG("domainwarp.png") c.ToPNG("domainwarp.png")
} }