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tensortest.go
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tensortest.go
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package gencitymap
import (
"image"
"image/color"
"github.com/Flokey82/go_gens/vectors"
"github.com/llgcode/draw2d/draw2dimg"
)
var DefaultNoiseParams = &NoiseParams{
Seed: 0,
globalNoise: true,
noiseSizePark: 2,
noiseAnglePark: 9,
noiseSizeGlobal: 3,
noiseAngleGlobal: 2,
}
var DefaultStreamlineParams = &StreamlineParams{
Dsep: 20,
Dtest: 15,
Dstep: 1,
Dcirclejoin: 5,
Dlookahead: 40,
Joinangle: 0.1,
PathIterations: 2000,
SeedTries: 30,
SimplifyTolerance: 10,
CollideEarly: 0.01,
}
type TotalTensorThing struct {
tensorField *TensorField
streamline *StreamlineGenerator
}
func (t *TotalTensorThing) ExportToPNG(filename string) error {
sg := t.streamline
img := image.NewRGBA(image.Rect(0, 0, int(sg.worldDimensions.X), int(sg.worldDimensions.Y)))
// Fill the background with black.
for x := 0; x < img.Bounds().Dx(); x++ {
for y := 0; y < img.Bounds().Dy(); y++ {
img.Set(x, y, color.RGBA{0, 0, 0, 255})
}
}
// New draw2d graphics context on an RGBA image.
gc := draw2dimg.NewGraphicContext(img)
gen := t.streamline
g := NewGraph(gen.allStreamlinesSimple, gen.params.Dstep, false)
f := NewPolygonFinder(g.Nodes, PolygonParams{
MaxLength: 40,
MinArea: 30,
ShrinkSpacing: 1,
ChanceNoDivide: 0.01,
}, t.tensorField)
//f.findPolygons()
f.Shrink(false)
f.Divide(false)
origin := gen.origin
drawPolygon := func(p []vectors.Vec2, colFill, colStroke color.RGBA) {
gc.SetFillColor(colFill)
gc.SetStrokeColor(colStroke)
gc.SetLineWidth(1)
for i, v := range p {
if i == 0 {
gc.MoveTo(v.X-origin.X, v.Y-origin.Y)
} else {
gc.LineTo(v.X-origin.X, v.Y-origin.Y)
}
}
gc.Close()
gc.FillStroke()
}
// Draw the polygons.
for _, p := range f.Polygons {
drawPolygon(p, color.RGBA{0, 0, 255, 255}, color.RGBA{0, 0, 0, 255})
}
for _, p := range f.ShrunkPolygons {
drawPolygon(p, color.RGBA{0, 255, 0, 255}, color.RGBA{0, 0, 0, 255})
}
for _, p := range f.DividedPolygons {
drawPolygon(p, color.RGBA{255, 0, 0, 255}, color.RGBA{0, 0, 0, 255})
}
// Draw minor streamlines.
gc.SetStrokeColor(color.RGBA{255, 255, 255, 255})
gc.SetLineWidth(4.0)
for _, v := range sg.streamlinesMajor {
// Draw a path.
gc.MoveTo(v[0].X-sg.origin.X, v[0].Y-sg.origin.Y)
for _, p := range v[1:] {
gc.LineTo(p.X-sg.origin.X, p.Y-sg.origin.Y)
}
gc.Stroke()
}
gc.SetStrokeColor(color.RGBA{255, 255, 255, 255})
gc.SetLineWidth(2.0)
for _, v := range sg.streamlinesMinor {
// Draw a path.
gc.BeginPath()
gc.MoveTo(v[0].X-sg.origin.X, v[0].Y-sg.origin.Y)
for _, p := range v[1:] {
gc.LineTo(p.X-sg.origin.X, p.Y-sg.origin.Y)
}
gc.Stroke()
}
// Save to file.
return draw2dimg.SaveToPngFile(filename, img)
}
func TensorTest() (*TotalTensorThing, error) {
// Set up some tensor stuff.
tt := &TotalTensorThing{
tensorField: NewTensorField(DefaultNoiseParams),
}
// Add some basis fields.
tt.tensorField.AddGrid(vectors.Vec2{X: 800, Y: 600}, 400, 20.5, 45)
tt.tensorField.AddGrid(vectors.Vec2{X: 1200, Y: 1000}, 400, 20.5, -45)
tt.tensorField.AddRadial(vectors.Vec2{X: 1400, Y: 1400}, 300, 20.5)
tt.tensorField.AddRadial(vectors.Vec2{X: 1200, Y: 1200}, 150, 20.5)
tt.tensorField.addField(NewOvalField(vectors.Vec2{X: 1600, Y: 1600}, 500, 20.5, -25, 1.5))
// Add a random sea.
// tensorField.sea = append(tensorField.sea, vectors.Vec2{X: 500, Y: 500}, vectors.Vec2{X: 1500, Y: 1500}, vectors.Vec2{X: 1100, Y: 1100}, vectors.Vec2{X: 100, Y: 100})
// tensorField.river = append(tensorField.river, vectors.Vec2{X: 500, Y: 500}, vectors.Vec2{X: 1500, Y: 1500}, vectors.Vec2{X: 1100, Y: 1100}, vectors.Vec2{X: 100, Y: 100})
// tensorField.river = append(tensorField.river, vectors.Vec2{X: 100, Y: 100}, vectors.Vec2{X: 500, Y: 100}, vectors.Vec2{X: 500, Y: 400}, vectors.Vec2{X: 100, Y: 400})
streamlineParams := DefaultStreamlineParams
origin := vectors.Vec2{X: 500, Y: 500}
dimensions := vectors.Vec2{X: 2000, Y: 2000}
gen, err := NewStreamlineGenerator(1234, NewRK4Integrator(tt.tensorField, streamlineParams), origin, dimensions, streamlineParams)
if err != nil {
return nil, err
}
gen.createAllStreamlines(false)
tt.streamline = gen
return tt, nil
}
func convToPairs(vectors []vectors.Vec2, origin vectors.Vec2) ([]int, []int) {
x := make([]int, len(vectors))
y := make([]int, len(vectors))
for i, v := range vectors {
x[i] = int(v.X - origin.X)
y[i] = int(v.Y - origin.Y)
}
return x, y
}