sumi/main.go

package main

import (
	"fmt"
	"log"
	"math/rand"
	"os"
	"time"

	"github.com/gen2brain/raylib-go/raylib"
	"github.com/ojrac/opensimplex-go"
)

const (
	targetWidth  = 1000
	targetHeight = 1000
	sourceScale  = 2
	snapshotsDir = "snapshots"
)

func main() {

	sourceWidth := int32(sourceScale * targetWidth)
	sourceHeight := int32(sourceScale * targetHeight)

	os.MkdirAll(snapshotsDir, 0755)
	log := log.New(os.Stdout, "", log.Ldate|log.Ltime|log.Lshortfile)
	storage, err := NewStorage(snapshotsDir)
	if err != nil {
		log.Printf("Error loading storage: %v\n", err)
		os.Exit(1)
	}

	rl.SetConfigFlags(rl.FlagMsaa4xHint)
	rl.InitWindow(targetWidth, targetHeight, "sumi sierpinski arrow")

	rl.SetTargetFPS(60)
	t0 := time.Now()

	/*
	 */

	imageField := NewImageField("/home/d/Dropbox/art/passage/data/david.png")

	field :=
		TranslateField{
			x: -float32(sourceWidth / 2.0),
			y: -float32(sourceHeight / 2.0),
			field: &ScaleField{
				scale: 1.0,
				field: &imageField,
			},
		}
	rng := rand.New(rand.NewSource(0))


	sketch := NewSketch(sourceWidth, sourceHeight)

	contourLayer := NewContourLayer(&sketch, rng, &field)
	//sketch.CreateLayer("testPattern", &TestPattern{}, int32(sourceWidth), int32(sourceHeight))
	//sketch.CreateLayer("actors", &contourLayer, int32(sourceWidth), int32(sourceHeight))
	//sketch.CreateLayer("field", &FieldLayer{field: &field, dirty: true}, int32(sourceWidth), int32(sourceHeight))
	sketch.CreateLayer("contours", &contourLayer)

	ports := MakePorts()
	ports["sierpinskiArrowAngle"] = Sine {
		Amp:  120,
		Bias: 100,
		Freq: 0.1,
	}

	for !rl.WindowShouldClose() {

		// begin drawing
		t := time.Since(t0).Seconds()

		// set up RenderCtx
		renderCtx := &RenderCtx{
			TargetWidth:  int32(targetWidth),
			TargetHeight: int32(targetHeight),
			SourceWidth:  int32(sourceWidth),
			SourceHeight: int32(sourceHeight),
			Time:         t,
			Ports:        ports.Eval(t),
		}

		sketch.Update(renderCtx)

		/**
		 *	MAIN DRAWING
		 */
		rl.BeginDrawing()
		rl.ClearBackground(rl.Blank)

		sketch.Draw(renderCtx)

		rl.DrawText("Mouse right button drag to move, mouse wheel to zoom", 10, 10, 20, rl.White)

		rl.EndDrawing()

		if rl.IsKeyDown(rl.KeySpace) {
			capture := sketch.Capture()
			if _, err := storage.Save(capture); err != nil {
				log.Printf("Error saving snapshot: %v\n", err)
			}
		}

		for ch := rl.GetCharPressed(); ch != 0; ch = rl.GetCharPressed() {
			c := rune(ch)
			if c == 'c' {
				sketch.ResetCamera()
			} else if c >= '1' && c <= '9' {
				zoom := 1 << int(ch-'0')
				sketch.cam.Zoom = float32(zoom)
			}
		}

		//rl.EndMode2D()

		// HUD
	}

	rl.CloseWindow()
}

type FieldLayer struct {
	field Field
	dirty bool
}

func (s *FieldLayer) Update(ctx *RenderCtx) {
	;
}

func (s *FieldLayer) Draw(ctx *RenderCtx) {
	for x := range ctx.SourceWidth {
		for y := range ctx.SourceHeight {
			v := s.field.Get(float32(x), float32(y))
			clr := GrayCurve(v, 1.0)
			rl.DrawPixel(x, y, clr)
		}
	}
	s.dirty = false
}

func (s *FieldLayer) IsDirty() bool {
	return s.dirty
}

type SierpinskiArrow struct{}

func (s *SierpinskiArrow) Draw(ctx *RenderCtx) {
	sierpinskiArrow(ctx, int(ctx.Ports["sierpinskiArrowDepth"]), ctx.Ports["sierpinskiArrowLength"])
}

func sierpinskiArrow(ctx *RenderCtx, order int, length float64) {
	if order == 0 {
		curve(ctx, order, length, ctx.Ports["sierpinskiArrowAngle"])
	} else {
		rl.Rotatef(float32(ctx.Ports["sierpinskiArrowAngle"]), 0, 0, 1)
		curve(ctx, order, length, -ctx.Ports["sierpinskiArrowAngle"])
	}
}

func curve(ctx *RenderCtx, order int, length float64, angle float64) {
	if order == 0 {
		len := int32(length)
		rl.DrawLine(0, 0, len, 0, rl.Black)
		rl.Translatef(float32(length), 0, 0)
	} else {
		curve(ctx, order-1, length/2, -angle)
		rl.Rotatef(float32(angle), 0, 0, 1)
		curve(ctx, order-1, length/2, angle)
		rl.Rotatef(float32(angle), 0, 0, 1)
		curve(ctx, order-1, length/2, -angle)
	}
}

func main2() {
	angles := make([]float32, 1000)
	noise := opensimplex.NewNormalized(0)
	for i := range len(angles) {
		angles[i] = float32(noise.Eval2(float64(i)*0.05, 0.00))*0.1 - 0.05
	}
	frameNum := 0
	for !rl.WindowShouldClose() {
		frameNum++
		// initial transform by halfway again through angle array
		angleIndex := (frameNum / 10) % len(angles)
		angle := angles[angleIndex]
		initAngle := angles[(angleIndex+len(angles)/2)%len(angles)]
		rl.Rotatef(2500*initAngle, 0, 0, 1)
		rl.Translatef(100*initAngle, 100*initAngle, 0)
		fmt.Printf("%.3f", angle)
		rl.EndMode2D()
	}
}