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

component_shooter_keyboard.go

@@ -0,0 +1,64 @@
+package GoRetro
+
+/*
+ * --------------------
+ * keyboardShooter
+ * --------------------
+ * Fire projectiles on keypress, rate limited
+ */
+
+import (
+	"time"
+
+	"github.com/veandco/go-sdl2/sdl"
+)
+
+type keyboardShooter struct {
+	container *Element
+	cooldown  time.Duration // Time between shots
+	lastShot  time.Time     // Last shot
+	shootFunc func(renderer *sdl.Renderer, collisionLayer int) *Element
+}
+
+func NewKeyboardShooter(container *Element, cooldown time.Duration, NewBullet func(renderer *sdl.Renderer, collisionLayer int) *Element) *keyboardShooter {
+	return &keyboardShooter{
+		container: container,
+		cooldown:  cooldown,
+		shootFunc: NewBullet}
+}
+
+func (shooter *keyboardShooter) onDraw() error {
+	return nil
+}
+
+func (shooter *keyboardShooter) onUpdate() error {
+	keys := sdl.GetKeyboardState()
+
+	//pos := shooter.container.Position
+
+	if keys[sdl.SCANCODE_SPACE] == 1 {
+		if time.Since(shooter.lastShot) >= shooter.cooldown {
+			// TODO: These positions should not be hard coded. Store as offset from
+			// container (i.e. gun positions)
+			shooter.shoot(shooter.container.Position.X+15, shooter.container.Position.Y-10, shooter.container.Rotation, shooter.container)
+			shooter.shoot(shooter.container.Position.X-15, shooter.container.Position.Y-10, shooter.container.Rotation, shooter.container)
+
+			shooter.lastShot = time.Now()
+		}
+	}
+
+	return nil
+}
+
+func (shooter *keyboardShooter) shoot(x, y, rotation float64, parent *Element) {
+	bul := shooter.shootFunc(parent.Renderer, parent.CollisionLayer+1)
+	bul.Active = true
+	bul.Position.X = x
+	bul.Position.Y = y
+	bul.Rotation = rotation
+	bul.parentElement = parent
+}
+
+func (shooter *keyboardShooter) onCollision(other *Element) error {
+	return nil
+}