implementar padrões de movimentos diferentes

main.go

@@ -39,8 +39,8 @@ type player struct {
 type enemy struct {
     pos rl.Vector2
     health int
-    movePattern movementPattern
+    movePattern func(*enemy)rl.Vector2
-    shootPattern shootingPattern
+    shootPattern func()
 }
 
 func (g game) insideArena(v rl.Vector2) bool {
@@ -74,9 +74,29 @@ func (e *enemy) shoot(g *game) {
     })
 }
 
+func horizonalPattern(g *game) (func(*enemy)rl.Vector2) {
+    direction := rl.Vector2{X: 4, Y: 0}
+
+    return func(e *enemy) rl.Vector2 {
+        result := rl.Vector2Add(direction, e.pos)
+
+        if !g.insideArena(result) {
+            direction = rl.Vector2Negate(direction)
+        }
+        return result
+    }
+}
+
+
 func (e *enemy) update(g *game) {
-    rl.DrawCircleV(e.pos, 5, rl.Blue)
+
+    if e.movePattern != nil {
+        e.pos = e.movePattern(e)
+    }
+
     e.shoot(g)
+
+    rl.DrawCircleV(e.pos, 5, rl.Blue)
 }
 
 func (p *player) move() {
@@ -87,6 +107,10 @@ func (p *player) move() {
 }
 
 func (p *player) shoot(g *game){
+    if g.time % 10 != 0 {
+        return
+    }
+
     if rl.IsMouseButtonDown(rl.MouseLeftButton) {
         // não leva em consideração a velocidade do jogador
         mouse := rl.GetMousePosition()
@@ -154,14 +178,17 @@ func main() {
     state.enemies = append(state.enemies, &enemy{
         pos: rl.Vector2{X: 200, Y: 200},
         health: 10,
+        movePattern: horizonalPattern(state),
     })
     state.enemies = append(state.enemies, &enemy{
         pos: rl.Vector2{X: 169, Y: 222},
         health: 10,
+        movePattern: horizonalPattern(state),
     })
     state.enemies = append(state.enemies, &enemy{
         pos: rl.Vector2{X: 219, Y: 195},
         health: 10,
+        movePattern: horizonalPattern(state),
     })
 
 	for ; !rl.WindowShouldClose(); state.time += 1 {