add circle noise

This commit is contained in:
Yongwei Xing 2021-03-17 16:29:20 +08:00
parent f602dda48a
commit dd0fb2f4d7
5 changed files with 139 additions and 22 deletions

View file

@ -29,8 +29,8 @@
- [Noise Line](#noise-line)
- [Dot Line](#dot-line)
- [Ocean Fish](#ocean-fish)
- [Silk Smoke](#silk-smoke)
- [Circle Loop](#circle-loop)
- [Circle Noise](#circle-noise)
- [Julia Set](#julia-set)
- [Silk Sky](#silk-sky)
- [Circle Move](#circle-move)
@ -70,6 +70,7 @@ This package is still working in progress. More types would be added. Welcome an
- Pixel Hole
- Dots Wave
- Circle Move
- Circle Noise
For these kinds of art, the package provides as many parameters to control the appearance.
@ -105,6 +106,7 @@ NewCircleLoop2(depth int)
NewPixelHole(dotN int)
NewDotsWave(dotsN int)
NewCircleMove(circleNum int)
NewCircleNoise(dotsN, colorMin, colorMax int)
```
## Docs
@ -378,26 +380,6 @@ func main() {
![](images/oceanfish.png)
### Silk Smoke
```go
func main() {
rand.Seed(time.Now().Unix())
c := generativeart.NewCanva(500, 500)
c.SetBackground(common.Black)
c.SetLineWidth(1.0)
c.SetLineColor(common.MediumAquamarine)
c.SetAlpha(30)
c.SetColorSchema(common.Plasma)
c.SetIterations(4)
c.FillBackground()
c.Draw(arts.NewSilkSmoke(400, 20, 0.2, 2, 10, 30, false))
c.ToPNG("silksmoke.png")
}
```
![](images/silksmoke.png)
### Circle Loop
```go
@ -417,6 +399,24 @@ func main() {
![](images/circleloop.png)
### Circle Noise
```go
func main() {
rand.Seed(time.Now().Unix())
c := generativeart.NewCanva(500, 500)
c.SetBackground(common.White)
c.SetAlpha(80)
c.SetLineWidth(0.3)
c.FillBackground()
c.SetIterations(400)
c.Draw(arts.NewCircleNoise(2000, 60, 80))
c.ToPNG("circlenoise.png")
}
```
![](images/circlenoise.png)
### Julia Set
```go

86
arts/circlenoise.go Normal file
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@ -0,0 +1,86 @@
package arts
import (
"github.com/fogleman/gg"
"github.com/jdxyw/generativeart"
"github.com/jdxyw/generativeart/common"
"math"
"math/rand"
)
type circleNoise struct {
dotsN int
colorMin, colorMax int
}
type dot struct {
x, y float64
prevx, prevy float64
theta float64
count int
}
func NewCircleNoise(dotsN, colorMin, colorMax int) *circleNoise {
return &circleNoise{
dotsN: dotsN,
colorMin: colorMin,
colorMax: colorMax,
}
}
// Generative draws a circle with perlin noise.
func (cn *circleNoise) Generative(c *generativeart.Canva) {
ctex := gg.NewContextForRGBA(c.Img())
ctex.SetLineWidth(2.0)
ctex.SetColor(common.Black)
radius := float64(c.Width()) * 0.8 / 2
ctex.DrawCircle(float64(c.Width()/2), float64(c.Height()/2), radius)
ctex.Stroke()
//ctex.Clip()
var factor = 0.008
noise := common.NewPerlinNoise()
dots := make([]dot, 0)
for i := 0; i < cn.dotsN; i++ {
theta := rand.Float64() * math.Pi * 2
x, y := float64(c.Width())/2+math.Sin(theta)*radius, float64(c.Height())/2+math.Cos(theta)*radius
dots = append(dots, dot{
theta: theta,
x: x,
y: y,
prevx: x,
prevy: y,
count: 0,
})
}
for j := 0; j < c.Opts().NIters(); j++ {
for i, _ := range dots {
n := noise.Noise2D(dots[i].x*factor, dots[i].y*factor)
nx, ny := math.Cos(n*math.Pi*2+float64(dots[i].count)*math.Pi)*2, math.Sin(n*math.Pi*2+float64(dots[i].count)*math.Pi)*2
dots[i].prevx, dots[i].prevy = dots[i].x, dots[i].y
dots[i].x, dots[i].y = dots[i].x+nx, dots[i].y+ny
hsv := common.HSV{
H: int(common.Remap(n, 0, 1, float64(cn.colorMin), float64(cn.colorMax))),
S: 100,
V: 20,
}
if common.Distance(float64(c.Width())/2, float64(c.Height())/2, dots[i].x, dots[i].y) > radius+2 {
dots[i].count += 1
}
if common.Distance(float64(c.Width())/2, float64(c.Height())/2, dots[i].x, dots[i].y) < radius &&
common.Distance(float64(c.Width())/2, float64(c.Height())/2, dots[i].prevx, dots[i].prevy) < radius {
ctex.SetLineWidth(c.Opts().LineWidth())
rgb := hsv.ToRGB(100, 100, 100)
rgb.A = uint8(c.Opts().Alpha())
ctex.SetColor(rgb)
ctex.DrawLine(dots[i].prevx, dots[i].prevy, dots[i].x, dots[i].y)
ctex.Stroke()
}
}
}
}

View file

@ -176,3 +176,13 @@ cm := generativeart.NewCircleMove(1000)
```
![](../images/circlemove.png)
### Circle Noise
### parameters
- dotsN: The number of dot.
- colorMin: The minimum color.
- colorMax: The maximum color.
![](../images/circlenoise.png)

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@ -0,0 +1,21 @@
package main
import (
"github.com/jdxyw/generativeart"
"github.com/jdxyw/generativeart/arts"
"github.com/jdxyw/generativeart/common"
"math/rand"
"time"
)
func main() {
rand.Seed(time.Now().Unix())
c := generativeart.NewCanva(500, 500)
c.SetBackground(common.White)
c.SetAlpha(80)
c.SetLineWidth(0.3)
c.FillBackground()
c.SetIterations(400)
c.Draw(arts.NewCircleNoise(2000, 60, 80))
c.ToPNG("circlenoise.png")
}

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