Work towards deletion system

game/game.go

@@ -21,19 +21,34 @@ func Run(root *node.Node, renderer rendering.Renderer2D, inputHandler input.Inpu
 		return nil
 	})
 
-	speed := 0.01
+	rotation_speed := 0.01
+	speed := 0.02
 	g.OnUpdate(func() error {
 
-		if inputHandler.IsKeyJustPressed(sdl.SCANCODE_SPACE) {
-			speed = -speed
+		if inputHandler.IsKeyJustReleased(sdl.SCANCODE_SPACE) {
+			rotation_speed = -rotation_speed
 		}
 
-		g.Rotation += speed
+		if inputHandler.IsKeyDown(sdl.SCANCODE_D) {
+			g.Position.X += speed
+		}
+		if inputHandler.IsKeyDown(sdl.SCANCODE_A) {
+			g.Position.X -= speed
+		}
+		if inputHandler.IsKeyDown(sdl.SCANCODE_S) {
+			g.Position.Y += speed
+		}
+		if inputHandler.IsKeyDown(sdl.SCANCODE_W) {
+			g.Position.Y -= speed
+		}
+
+		g.Rotation += rotation_speed
 		return nil
 	})
 
 	controller := node.NewNode()
 	controller.Name = "Controller"
+	controller.SetProcessMode(node.ActiveProcessMode)
 	defer root.AddChild(&controller)
 
 	controller.OnUpdate(func() error {
@@ -45,6 +60,12 @@ func Run(root *node.Node, renderer rendering.Renderer2D, inputHandler input.Inpu
 			}
 		}
 
+		if inputHandler.IsKeyJustPressed(sdl.SCANCODE_P) {
+			if err := g.Free(); err != nil {
+				return err
+			}
+		}
+
 		return nil
 	})
 

node/inode.go

@@ -15,4 +15,5 @@ type INode interface {
 	IsProcessing() bool
 	GetProcessMode() ProcessMode
 	SetProcessMode(ProcessMode)
+	Free() error
 }

node/node.go

@@ -1,6 +1,7 @@
 package node
 
 import (
+	"fmt"
 	"log"
 
 	"github.com/manleydev/golang-game-framework/rendering"
@@ -112,6 +113,26 @@ func (node *Node) GetName() string {
 	return node.Name
 }
 
+func (node *Node) Free() error {
+
+	var parent *Node = node.parent.(*Node)
+	if err := parent.removeChild(node); err != nil {
+		return err
+	}
+	node.parent = nil
+	return nil
+}
+
+func (node *Node) removeChild(target *Node) error {
+	for i, child := range node.children {
+		if child == target {
+			node.children = append(node.children[:i], node.children[i+1:]...)
+			return nil
+		}
+	}
+	return fmt.Errorf("Could not remove child '%s', child not found on parent!", target.Name)
+}
+
 func (node *Node) GetChild(index int) INode {
 	if index < len(node.children) {
 		return nil