automated snapshot

main.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"log"
 	"math"
+	"math/rand"
 	"os"
 	"time"
 
@@ -38,6 +39,8 @@ func main() {
 
 	os.MkdirAll(snapshotsDir, 0755)
 
+	rng := rand.New(rand.NewSource(0))
+
 	log := log.New(os.Stdout, "", log.Ldate|log.Ltime|log.Lshortfile)
 
 	storage, err := NewStorage(snapshotsDir)
@@ -58,25 +61,26 @@ func main() {
 	w := rl.GetRenderWidth()
 	h := rl.GetRenderHeight()
 
-	angles := make([]float32, 2000)
-	noise := opensimplex.NewNormalized(0)
-	r := 2.0
-	dtheta := 360.0/float64(len(angles))
-	for i := range len(angles) {
-		rad := float64(i) * dtheta * math.Pi / 180.0
-		x := r * math.Cos(rad)
-		y := r * math.Sin(rad)
-		angles[i] = float32(noise.Eval2(x, y) * 360.0)
-	}
-
-	sketches := []Sketch{
-		&Worm{
-			position: rl.Vector2 { X: 50, Y: 50 },
-			angles: angles,
-			angleIndex: 0,
-			stepSize: 1,
-			renderPct: 0.1,
-		},
+	sketches := make([]Sketch, 1000)
+	for i := range 1000 {
+		angles := make([]float32, 100)
+		noise := opensimplex.NewNormalized(int64(i))
+		r := 1.0
+		dtheta := 360.0/float64(len(angles))
+		for i := range len(angles) {
+			rad := float64(i) * dtheta * math.Pi / 180.0
+			x := r * math.Cos(rad)
+			y := r * math.Sin(rad)
+			angles[i] = float32(noise.Eval2(x, y) * 360.0)
+		}
+		sketches[i] =
+			&Worm{
+				position: RandRadialVec(rng, 0, 100, -180, 180),
+				angles: angles,
+				angleIndex: 0,
+				stepSize: 1,
+				renderPct: 0.80,
+			}
 	}
 
 	var camera = rl.Camera2D{
@@ -110,7 +114,7 @@ func main() {
 
 		// begin drawing
 		rl.BeginDrawing()
-		rl.ClearBackground(rl.RayWhite)
+		rl.ClearBackground(rl.Black)
 		rl.BeginMode2D(camera)
 
 		t := time.Since(t0).Seconds()
@@ -149,6 +153,13 @@ func main() {
 	rl.CloseWindow()
 }
 
+func RandRadialVec(rng *rand.Rand, minRadius float32, maxRadius float32, loAngle float32, hiAngle float32) rl.Vector2 {
+	r := float64(rl.Remap(rng.Float32(), 0, 1, minRadius, maxRadius))
+	deg := float64(rl.Remap(rng.Float32(), 0, 1, loAngle, hiAngle))
+	rad := rl.Deg2rad * deg
+	return rl.Vector2 { X: float32(r * math.Cos(rad)), Y: float32(r * math.Sin(rad)) }
+}
+
 func updateCamera(camera *rl.Camera2D) {
 	// Get the world point that is under the mouse
 	mouseVec2 := rl.GetMousePosition()
@@ -195,11 +206,19 @@ func (w *Worm) Draw(ctx *RenderCtx) {
 	rl.Translatef(w.position.X, w.position.Y, 0)
 	lastAngle := float32(0.0)
 	stepCount := 0
+	nudged := false
 	for i := range w.angles {
 		ii := (i + w.angleIndex) % len(w.angles)
 		angle := w.angles[ii]
-		rl.Rotatef(angle - lastAngle, 0, 0, 1)
-		rl.DrawLine(0, 0, int32(w.stepSize), 0, rl.Black)
+		deltaAngle := angle - lastAngle
+		if !nudged {
+			rad := float64(deltaAngle * math.Pi / 180.0)
+			nudge := rl.Vector2 { X: float32(w.stepSize) * float32(math.Cos(rad)), Y: float32(w.stepSize) * float32(math.Sin(rad)) }
+			w.position = rl.Vector2Add(w.position, nudge)
+			nudged = true
+		}
+		rl.Rotatef(deltaAngle, 0, 0, 1)
+		rl.DrawLine(0, 0, int32(w.stepSize), 0, rl.NewColor(184, 187, 38, 50))
 		rl.Translatef(float32(w.stepSize), 0, 0)
 		lastAngle = angle
 		stepCount++