Added road map generation

proto2/growth_rules/grid.gd

@@ -0,0 +1,42 @@
+extends Reference
+
+class_name GridRule
+
+func new_vertex(pos):
+	var v = {
+		"pos": pos,
+		"neighbors": [],
+		"seed": false
+	}
+	return v
+
+func get_suggestion(rdata, v, b):
+	var pforward = 1.0
+	var pturn = 0.09
+	var lmin = 20.0
+	var lmax = 20.0
+	var suggestion = []
+	var wait = true
+
+	var prev = v.pos - v.neighbors[v.neighbors.size() - 1].pos
+	prev - prev.normalized()
+	var n = prev.tangent()
+	if n.length() < lmin:
+		n = n.normalized() * lmin
+	var vp = prev.normalized() * rand_range(lmin, lmax)
+	var rnd = rdata.randf()
+	if rnd <= pforward:
+		var sv = new_vertex(v.pos + vp)
+		sv.seed = true
+		suggestion.append(new_vertex(v.pos + vp))
+		wait = false
+	rnd = rdata.randf()
+	if rnd <= pturn * b * b:
+		suggestion.append(new_vertex(v.pos + n))
+		wait = true
+	rnd = rdata.randf()
+	if rnd <= pturn * b * b:
+		suggestion.append(new_vertex(v.pos - n))
+		wait = true
+		
+	return suggestion