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

component_mover_keyboard.go

@@ -0,0 +1,90 @@
+package GoRetro
+
+/*
+ * --------------------
+ * moverKeyboard
+ * --------------------
+ * A simple mover that moves the container a fixed
+ * distance each tick when arrow keys are used
+ *
+ * NOTE: Container must have a spriteRenderer to
+ *       read dimesions from!
+ */
+
+import (
+	"github.com/veandco/go-sdl2/sdl"
+)
+
+type moverKeyboard struct {
+	container *Element
+	speed     float64
+}
+
+func NewMoverKeyboard(container *Element, speed float64) *moverKeyboard {
+	return &moverKeyboard{
+		container: container,
+		speed:     speed,
+	}
+}
+
+func (mover *moverKeyboard) onDraw() error {
+	return nil
+}
+
+func (mover *moverKeyboard) onUpdate() error {
+	keys := sdl.GetKeyboardState()
+
+	// For now, spoof a 1 radius circle above, below, left and right of the player
+	// to keep them within the screen. bounder_screen would make the player cease
+	// to exist if we did that
+	cLeft := Circle{
+		Radius: 1,
+		Center: Vector{X: 0, Y: mover.container.Position.Y},
+	}
+	cRight := Circle{
+		Radius: 1,
+		Center: Vector{X: ScreenWidth, Y: mover.container.Position.Y},
+	}
+	cTop := Circle{
+		Radius: 1,
+		Center: Vector{X: mover.container.Position.X, Y: 0},
+	}
+	cBottom := Circle{
+		Radius: 1,
+		Center: Vector{X: mover.container.Position.X, Y: ScreenHeight},
+	}
+
+	// Handle direction keys and check of we collide.
+	if keys[sdl.SCANCODE_LEFT] == 1 {
+		for _, c2 := range mover.container.Collisions {
+			if !collides(cLeft, circleOffset(c2, mover.container.Position)) {
+				mover.container.Position.X -= mover.speed * Delta
+			}
+		}
+	} else if keys[sdl.SCANCODE_RIGHT] == 1 {
+		for _, c2 := range mover.container.Collisions {
+			if !collides(cRight, circleOffset(c2, mover.container.Position)) {
+				mover.container.Position.X += mover.speed * Delta
+			}
+		}
+	}
+	if keys[sdl.SCANCODE_UP] == 1 {
+		for _, c2 := range mover.container.Collisions {
+			if !collides(cTop, circleOffset(c2, mover.container.Position)) {
+				mover.container.Position.Y -= mover.speed * Delta
+			}
+		}
+	} else if keys[sdl.SCANCODE_DOWN] == 1 {
+		for _, c2 := range mover.container.Collisions {
+			if !collides(cBottom, circleOffset(c2, mover.container.Position)) {
+				mover.container.Position.Y += mover.speed * Delta
+			}
+		}
+	}
+
+	return nil
+}
+
+func (mover *moverKeyboard) onCollision(other *Element) error {
+	return nil
+}