Move all engine stuff to GoRetro. Still many interactions between game and engine code that there should not be.

component_mover_linear.go

@@ -0,0 +1,40 @@
+package GoRetro
+
+/*
+ * --------------------
+ * moverLinear
+ * --------------------
+ * A simple mover that moves the container a fixed
+ * distance each tick in the direction of its rotation
+ */
+
+import (
+	"math"
+)
+
+type moverLinear struct {
+	container *Element
+	speed     float64
+}
+
+func NewMoverLinear(container *Element, speed float64) *moverLinear {
+	return &moverLinear{container: container, speed: speed}
+}
+
+func (mover *moverLinear) onDraw() error {
+	return nil
+}
+
+func (mover *moverLinear) onUpdate() error {
+	c := mover.container
+
+	// Move, taking into account rotation in degrees
+	c.Position.X += mover.speed * math.Sin(c.Rotation*(math.Pi/180)) * Delta
+	c.Position.Y += mover.speed * math.Cos(c.Rotation*(math.Pi/180)) * Delta
+
+	return nil
+}
+
+func (mover *moverLinear) onCollision(other *Element) error {
+	return nil
+}