automated snapshot

contour_layer.go

@@ -8,14 +8,16 @@ import (
 
 type ContourLayer struct {
 	field  Field
+	rng    *rand.Rand
 	maxActors uint32
 	actors []*Actor
 	actorIndex uint32
 	actorColor rl.Color
-	rng    *rand.Rand
+	loActorAngle float32
+	hiActorAngle float32
 }
 
-func NewContourLayer(sketch *Sketch, rng *rand.Rand, field Field, color rl.Color) *ContourLayer {
+func NewContourLayer(sketch *Sketch, rng *rand.Rand, field Field, color rl.Color, loActorAngle float32, hiActorAngle float32) *ContourLayer {
 
 	maxActors := 200000
 
@@ -28,6 +30,8 @@ func NewContourLayer(sketch *Sketch, rng *rand.Rand, field Field, color rl.Color
 		maxActors: uint32(maxActors),
 		actorColor: color,
 		actorIndex: 0,
+		loActorAngle: loActorAngle,
+		hiActorAngle: hiActorAngle,
 	}
 
 	return &layer
@@ -43,6 +47,8 @@ func (s *ContourLayer) AddActors(color rl.Color, n, sourceWidth, sourceHeight in
 				field:    s.field,
 				stepSize: 1,
 				color:    s.actorColor,
+				loAngle: s.loActorAngle,
+				hiAngle: s.hiActorAngle,
 			}
 		s.actors[s.actorIndex] = newActor
 		s.actorIndex = (s.actorIndex + 1) % s.maxActors
@@ -72,11 +78,13 @@ type Actor struct {
 	field    Field
 	stepSize float32
 	color    rl.Color
+	loAngle  float32
+	hiAngle  float32
 }
 
 func (a *Actor) Draw() {
 	v := a.field.Get(a.position.X, a.position.Y)
-	rad := rl.Remap(v, 0, 1, 0, 5*math.Pi)
+	rad := rl.Remap(v, 0, 1, a.loAngle, a.hiAngle)
 	nextPosition := rl.Vector2{X: a.position.X + a.stepSize*float32(math.Cos(float64(rad))), Y: a.position.Y + a.stepSize*float32(math.Sin(float64(rad)))}
 	rl.DrawLineV(a.position, nextPosition, a.color)
 	a.position = nextPosition