add the black hole

This commit is contained in:
Yongwei Xing 2021-03-19 14:23:42 +08:00
parent 4d34123c4a
commit 28ac3ae4eb
5 changed files with 109 additions and 2 deletions

View file

@ -32,6 +32,7 @@
- [Circle Loop](#circle-loop)
- [Circle Noise](#circle-noise)
- [Julia Set](#julia-set)
- [Black Hole](#black-hole)
- [Silk Sky](#silk-sky)
- [Circle Move](#circle-move)
- [Random Circle](#random-circle)
@ -72,6 +73,7 @@ This package is still working in progress. More types would be added. Welcome an
- Circle Move
- Circle Noise
- Yarn
- Black Hole
For these kinds of art, the package provides as many parameters to control the appearance.
@ -109,6 +111,7 @@ NewDotsWave(dotsN int)
NewCircleMove(circleNum int)
NewCircleNoise(dotsN, colorMin, colorMax int)
NewYarn(n int)
NewBlackHole(circleN int, density, circleGap float64)
```
## Docs
@ -445,6 +448,23 @@ func main() {
![](images/julia.png)
### Black Hole
```go
func main() {
rand.Seed(time.Now().Unix())
c := generativeart.NewCanva(500, 500)
c.SetBackground(color.RGBA{R: 30, G: 30, B: 30, A: 255})
c.FillBackground()
c.SetLineWidth(1.0)
c.SetLineColor(common.Tomato)
c.Draw(arts.NewBlackHole(200, 400, 0.01))
c.ToPNG("blackhole.png")
}
```
![](images/blackhole.png)
### Silk Sky
```go

50
arts/blackhole.go Normal file
View file

@ -0,0 +1,50 @@
package arts
import (
"github.com/fogleman/gg"
"github.com/jdxyw/generativeart"
"github.com/jdxyw/generativeart/common"
"math"
)
type blackHole struct {
circleN int
density float64
circleGap float64
}
// NewBlackHole returns a blackhole object.
func NewBlackHole(circleN int, density, circleGap float64) *blackHole {
return &blackHole{
circleN: circleN,
density: density,
circleGap: circleGap,
}
}
// Generative draws a black hole image.
func (b *blackHole) Generative(c *generativeart.Canva) {
ctex := gg.NewContextForRGBA(c.Img())
noise := common.NewPerlinNoise()
kMax := common.RandomRangeFloat64(0.5, 1)
ctex.SetLineWidth(0.4)
ctex.SetColor(c.Opts().LineColor())
for i := 0; i < b.circleN; i++ {
radius := float64(c.Width()/10) + float64(i)*0.05
k := kMax * math.Sqrt(float64(i)/float64(b.circleN))
noisiness := b.density * math.Pow(float64(i)/float64(b.circleN), 2)
for theta := 0.0; theta < 361; theta += 1.0 {
r1 := math.Cos(gg.Radians(theta)) + 1
r2 := math.Sin(gg.Radians(theta)) + 1
r := radius + noise.Noise3D(k*r1, k*r2, float64(i)*b.circleGap)*noisiness
x := float64(c.Width())/2 + r*math.Cos(gg.Radians(theta))
y := float64(c.Height()/2) + r*math.Sin(gg.Radians(theta))
ctex.LineTo(x, y)
}
ctex.Stroke()
ctex.ClearPath()
}
}

View file

@ -32,6 +32,8 @@
- [parameters](#parameters-13)
- [Yarn](#yarn)
- [parameters](#parameters-14)
- [Black Hole](#black-hole)
- [parameters](#parameters-15)
## Color Circle 2
`Color Circle2` is version 2 of `Color Circle`. It still draws the circle and point cloud.
@ -225,10 +227,24 @@ cm := arts.NewCircleMove(1000)
### parameters
- n: The number of curve.
- n: The number of the curve.
```go
y := arts.NewYarn(2000)
```
![](../images/yarn.png)
## Black Hole
### parameters
- circleN: The number of the circle.
- density: Control the density of the circle.
- circleGap: Identify the gap between two circles.
```go
b := arts.NewBlackHole(200, 400, 0.01)
```
![](../images/blackhole.png)

View file

@ -0,0 +1,21 @@
package main
import (
"github.com/jdxyw/generativeart"
"github.com/jdxyw/generativeart/arts"
"github.com/jdxyw/generativeart/common"
"image/color"
"math/rand"
"time"
)
func main() {
rand.Seed(time.Now().Unix())
c := generativeart.NewCanva(500, 500)
c.SetBackground(color.RGBA{R: 30, G: 30, B: 30, A: 255})
c.FillBackground()
c.SetLineWidth(1.0)
c.SetLineColor(common.Tomato)
c.Draw(arts.NewBlackHole(200, 400, 0.01))
c.ToPNG("blackhole.png")
}

BIN
images/blackhole.png Normal file

Binary file not shown.

After

Width:  |  Height:  |  Size: 292 KiB