Brought in screen manager, minor refactor.

elements/explosion.go

@@ -0,0 +1,42 @@
+package elements
+
+import "mover/gamedata"
+
+type Explosion struct {
+	Radius float64
+	Origin gamedata.Coordinates
+	cycle  int
+	Active bool
+}
+
+func NewExplosion() *Explosion {
+	return &Explosion{
+		cycle:  1,
+		Active: false,
+	}
+}
+
+func (e *Explosion) Draw() {
+
+}
+
+func (e *Explosion) Update() {
+
+	if e.Active {
+		e.Radius = float64(e.cycle) / 0.15
+		e.cycle++
+	}
+
+}
+
+func (e *Explosion) SetOrigin(origin gamedata.Coordinates) {
+	e.Origin = origin
+}
+
+func (e *Explosion) ToggleActivate() {
+	e.Active = !e.Active
+}
+
+func (e *Explosion) Reset() {
+	e.cycle = 1
+}