1. Gameprogrammeren: Menu’s in Penguin Pairs
Arjan Egges
Paul Bergervoet
Wouter van Toll

2. Overzicht

3. Menu’s
Tekst
Aan/uit knop
Slider

4. TextGameObject class TextGameObject : GameObject {
protected SpriteFont spriteFont;
protected Color color;
protected string text;
public TextGameObject(string assetname, int layer = 0, string id = "")
: base(layer, id)
spriteFont = PenguinPairs.AssetManager.Content.Load<SpriteFont>(assetname);
color = Color.White; }
...

5. TextGameObject
public override void Draw(GameTime gameTime, SpriteBatch s) {
if (visible)
spriteBatch.DrawString(spriteFont, text, this.GlobalPosition, color); }
public Color Color
get { return color; }
set { color = value; }
public string Text
get { return text; }
set { text = value; }

6. Knoppen: muisklik detecteren
Hoe weten we of op een knop geklikt wordt?
Muisknop ingedrukt
Muis is binnen de rechthoek die de knop omsluit
BoundingBox property toevoegen aan SpriteGameObject:
public override Rectangle BoundingBox {
get
int left = (int)(GlobalPosition.X - origin.X);
int top = (int)(GlobalPosition.Y - origin.Y);
return new Rectangle(left, top, Width, Height); }

7. Eenvoudige knop class Button : SpriteGameObject {
protected bool pressed;
public Button(string imageAsset, int layer = 0, string id = "")
: base(imageAsset, layer, id)
{ }
public override void HandleInput(InputHelper inputHelper) {
pressed = inputHelper.MouseLeftButtonPressed() &&
BoundingBox.Contains((int)inputHelper.MousePosition.X,
(int)inputHelper.MousePosition.Y); }
public bool Pressed
{ get { return pressed; } }

8. Aan/uit knop (toggle) class OnOffButton : SpriteGameObject {
public OnOffButton(string imageAsset, int layer = 0, string id = "")
: base(imageAsset, layer, id, 0) }
public override void HandleInput(InputHelper inputHelper)
if (inputHelper.MouseLeftButtonPressed() &&
BoundingBox.Contains((int)inputHelper.MousePosition.X,
(int)inputHelper.MousePosition.Y))
sheetIndex = (sheetIndex + 1) % 2;
...

9. Aan/uit knop (toggle) public bool On { get
return sprite.SheetIndex == 1; }
set
if (value)
sprite.SheetIndex = 1;
else
sprite.SheetIndex = 0;

10. Slider class Slider : GameObjectList {
protected SpriteGameObject back, front;
protected bool dragging;
protected int leftmargin, rightmargin;
public Slider(string sliderback, string sliderfront, int layer = 0,
string id = "") : base(layer, id) }
...

11. Slider
public Slider(string sliderback, string sliderfront, int layer = 0,
string id = "") : base(layer, id) {
leftmargin = 5;
rightmargin = 7;
back = new SpriteGameObject(sliderback, 0);
this.Add(back);
front = new SpriteGameObject(sliderfront, 1);
front.Position = new Vector2(leftmargin, 8);
this.Add(front);
dragging = false; }

12. Slider public override void HandleInput(InputHelper inputHelper) {
if (inputHelper.MouseLeftButtonDown()) {
if (back.BoundingBox.Contains((int)inputHelper.MousePosition.X,
(int)inputHelper.MousePosition.Y) || dragging)
float newxpos = MathHelper.Clamp(inputHelper.MousePosition.X -
back.GlobalPosition.X - front.Width / 2, back.Position.X + leftmargin,
back.Position.X + back.Width - front.Width - rightmargin);
front.Position = new Vector2(newxpos, front.Position.Y);
dragging = true; }
else
dragging = false;

13. Slider public float Value { get
return (front.Position.X - back.Position.X - leftmargin) /
(back.Width - leftmargin - rightmargin - front.Width); }
set
float newxpos = value * (back.Width - leftmargin - rightmargin –
front.Width) + back.Position.X + leftmargin;
front.Position = new Vector2(newxpos, front.Position.Y);