Bu yazimi okumadan once Windows Phone ve XNA konusundaki diger makalelerimi okumanizi oneririm.

Her zamanki gibi once gorseller;

Bir tane de Sprite Font dosyamiz var, HitCountFont.spritefont ismini verdigim dosyanin, “yorum satirlari kaldirilmis halini” asagidaki gibi duzenledim;

<?xml version="1.0" encoding="utf-8"?>
<XnaContent xmlns:Graphics="Microsoft.Xna.Framework.Content.Pipeline.Graphics">
	<Asset Type="Graphics:FontDescription">
		<FontName>Segoe UI Mono</FontName>
		<Size>14</Size>
		<Spacing>0</Spacing>
		<UseKerning>true</UseKerning>
		<Style>Regular</Style>
		<CharacterRegions>
			<CharacterRegion>
				<Start> </Start>
				<End>~</End>
			</CharacterRegion>
		</CharacterRegions>
	</Asset>
</XnaContent>

Ilk olarak XNA Game Studio 4.0 grubundaki Windows Phone Game sablonundan PlaneHunter isimli projeyi olusturalim;

Game1.cs dosyasinin ismini GameLoop.cs olarak degistirdikten sonra, Target isminde yeni bir class ekleyelim;

public class Target
{
	public Texture2D Texture;

	public Vector2 Position;

	public Vector2 Velocity;

	public Rectangle Area;

	public SpriteEffects Effect;

	public bool IsAlive;

	public Target(Texture2D texture)
	{
		this.Texture = texture;

		this.IsAlive = true;

		this.Area = new Rectangle(0, 0, texture.Width, texture.Height);
	}
}

Target sinifi sayesinde, ekrana getirecegimiz hedef‘lerin ekranin neresinden cikip, hangi yone dogru gidecegini, hedefin vurulup/vurulmadigini, carpisma testi yapabilmek icin ekranda kapladigi alani ve hizini bilecegiz.

GameLoop sinifina geri donelim ve sinif seviyesindeki degiskenlere asagidakileri ekleyelim;

private const int PENCERE_GENISLIK = 800;
private const int PENCERE_YUKSEKLIK = 480;

private Texture2D backgroundTexture;

private readonly Texture2D[] targetTextures = new Texture2D[7];

private Texture2D coinTexture;
private Rectangle coinPart;
private int coinPartIndex = 0;

private SpriteFont hitCountFont;
private int targetHitCount = 0;

private readonly List targetList = new List();  private TimeSpan lastTargetSpawnTime = TimeSpan.Zero;  private readonly Rectangle screenArea = new Rectangle(0, 0, PENCERE_GENISLIK, PENCERE_YUKSEKLIK);  private readonly Random r = new Random();

Yukaridaki kodlar icin daha once yazmis oldugum Windows Phone ve XNA konusundaki diger makalelerimi okumanizi oneririm.

GameLoop sinifinin constructor‘inda asagidaki atama islerini yapalim;

graphics.PreferredBackBufferWidth = PENCERE_GENISLIK;
graphics.PreferredBackBufferHeight = PENCERE_YUKSEKLIK;
graphics.IsFullScreen = true;

graphics.SupportedOrientations = DisplayOrientation.LandscapeLeft | DisplayOrientation.LandscapeRight;

SupportedOrientations ozelligine DisplayOrientation enum’indan LandscapeLeft ve LandscapeRight degerlerini atayarak, oyun ekraninin telefon dikey degil, yatay tutuldugunda duzgun goruntulenecegini tanimlamis olduk.

LoadContent method’unda Texture2D tipindeki degiskenlerimize deger atayalim;

backgroundTexture = Content.Load<Texture2D>("PlaneHunterBackground");

coinTexture = Content.Load<Texture2D>("PlaneHunterCoin");
hitCountFont = Content.Load<SpriteFont>("PlaneHunterHitCountFont");

for (int i = 0; i < targetTextures.Length; i++)
{
	targetTextures[i] = Content.Load<Texture2D>("PlaneHunterTarget" + (i + 1));
}

Update method_unda son hedef uretilme zamanindan itibaren yeterli sure gecmisse, yeni hedef olusturmamiz lazim;

lastTargetSpawnTime += gameTime.ElapsedGameTime;

if (lastTargetSpawnTime > TimeSpan.FromMilliseconds(1500))
{
	Target t = new Target(targetTextures[r.Next(0, 7)]);
	switch (r.Next(0, 4))
	{
		case 0:
		default:
			t.Position = new Vector2(r.Next(100, 300), 480);
			t.Velocity = new Vector2((float)r.NextDouble() * 8 + 2, (float)r.NextDouble() * -4 - 2);
			t.Effect = SpriteEffects.FlipHorizontally;
			break;
		case 1:
			t.Position = new Vector2(r.Next(500, 700), 480);
			t.Velocity = new Vector2((float)r.NextDouble() * -8 - 2, (float)r.NextDouble() * -4 - 2);
			t.Effect = SpriteEffects.None;
			break;
		case 2:
			t.Position = new Vector2(r.Next(100, 300), 0);
			t.Velocity = new Vector2((float)r.NextDouble() * 8 + 2, (float)r.NextDouble() * 4 + 2);
			t.Effect = SpriteEffects.FlipHorizontally;
			break;
		case 3:
			t.Position = new Vector2(r.Next(500, 700), 0);
			t.Velocity = new Vector2((float)r.NextDouble() * -8 - 2, (float)r.NextDouble() * 4 + 2);
			t.Effect = SpriteEffects.None;
			break;
	}

	targetList.Add(t);

	lastTargetSpawnTime = TimeSpan.Zero;
}

Yeni hedef ekleyecegimiz zaman oncelikle hedef’i ekranin dort kosesinden rastgele birtanesine koyup, rastgele hiz veriyoruz. Boylece hedefler ekranin rastgele bir yerinden cikip rastgele hizla rastgele bir yone dogru hareket edecek.

Update method’unda o esnada ekranda olan hedeflerin yerlerini ve ekranda kapladiklari alani guncelliyoruz;

foreach (Target hedef in targetList)
{
	hedef.Position += hedef.Velocity;

	hedef.Area.X = (int)hedef.Position.X;
	hedef.Area.Y = (int)hedef.Position.Y;
}

Windows Phone oyunlarinda, oyuncunun ekrana dokundugu noktalarin listesini TouchPanel sinifinin static GetState methodundan donen TouchCollection ile alabilmekteyiz.

TouchCollection koleksiyonunun her bir elemani TouchLocation tipindedir, State ozelliginin TouchLocationState enum’indan Pressed degerinde oldugunu kontrol ederek, ilgili noktaya dokunuldugu durumu yakalayabilir, eger bir hedef ile kesisiyorsa, hedefi oldurebiliriz;

TouchCollection tc = TouchPanel.GetState();
foreach (TouchLocation tl in tc)
{
	if (tl.State == TouchLocationState.Pressed)
	{
		Rectangle touchArea = new Rectangle((int)tl.Position.X, (int)tl.Position.Y, 1, 1);

		foreach (Target hedef in targetList)
		{
			if (hedef.Area.Intersects(touchArea))
			{
				hedef.Velocity = Vector2.Zero;

				hedef.IsAlive = false;

				targetHitCount++;
			}
		}
	}
}

Update method’unda, ekran sinirlari disina cikan hedefleri listeden cikartmaliyiz. Eger ekran disina cikan hedefleri listeden temizlemezsek, liste zamanla cok buyuyecek, telefonun kisitli olan hafizasini dolduracak ve oyunun once yavaslamasina sonra kapanmasina yol acabilecektir.

foreach (Target hedef in targetList)
{
	if (!hedef.Area.Intersects(screenArea))
	{
		targetList.Remove(hedef);

		break;
	}
}

Draw method’unda elimizdeki arkaplan gorselini, hayatta olan hedefleri, hayatta olmayan hedefler icin kendi etrafinda donen altin gorselini ve toplam kac hedefin vuruldugunu gosteren skor‘u ekrana cizdirecegiz;

spriteBatch.Begin();

spriteBatch.Draw(backgroundTexture, Vector2.Zero, Color.White);

foreach (Target hedef in targetList)
{
	if (hedef.IsAlive)
	{
		spriteBatch.Draw(hedef.Texture, hedef.Position, null, Color.White, 0, Vector2.Zero, 1, hedef.Effect, 0);
	}
	else
	{
		spriteBatch.Draw(coinTexture, hedef.Position, coinPart, Color.White);
	}
}

spriteBatch.DrawString(hitCountFont, "Hit Count : " + targetHitCount, new Vector2(10, 10), Color.Black);
spriteBatch.DrawString(hitCountFont, "Hit Count : " + targetHitCount, new Vector2(9, 9), Color.White);

spriteBatch.End();

Oyunumuzdan bir kare;

Oyunun kodlarini buradan indirebilirsiniz.