Moveable viewport. Absolute positioning (for UI etc) is possible. Added distance-based bounder for projectiles etc as 'screen' is no longer a suitable bounder. Removed debug msg.

component_bounder_distance.go

@@ -0,0 +1,40 @@
+package GoRetro
+
+/*
+ * --------------------
+ * BounderDistance
+ * --------------------
+ * A bounder which triggers if the distance from spawn to current exceeds range
+ */
+
+type bounderDistance struct {
+	container    *Element
+	callbackFunc func(element *Element)
+	maxrange     float64
+}
+
+func NewBounderDistance(container *Element, callback func(element *Element), maxrange float64) *bounderDistance {
+	return &bounderDistance{
+		container:    container,
+		callbackFunc: callback,
+		maxrange:     maxrange,
+	}
+}
+
+func (bounder *bounderDistance) onDraw() error {
+	return nil
+}
+
+func (bounder *bounderDistance) onUpdate() error {
+	b := bounder.container
+
+	if vectorDistance(b.Position, b.SpawnPosition) > bounder.maxrange {
+		bounder.callbackFunc(bounder.container)
+	}
+
+	return nil
+}
+
+func (bounder *bounderDistance) onCollision(other *Element) error {
+	return nil
+}