Added rotation capability and added a new calss Vector3f that holds 3 float values for ex rotation

src/ei/engine/scene/Entity.java

@@ -3,7 +3,10 @@
  */
 package ei.engine.scene;
 
+import org.lwjgl.opengl.GL11;
+
 import ei.engine.math.Vector2f;
+import ei.engine.math.Vector3f;
 
 /**
  * This class is the root class of all the objects that
@@ -19,7 +22,7 @@ public abstract class Entity {
 	private Vector2f location;	
 	  
 	/** The rotation of this entity in pixels*/
-	private Vector2f rotation;
+	private Vector3f rotation;
 	
 	/** The size of this entity in pixels*/
 	private Vector2f size;
@@ -31,7 +34,9 @@ public abstract class Entity {
 	 */
 	public Entity(String name){
 		this.name = name;
-		location = new Vector2f(0,0);
+		location = new Vector2f();
+		rotation = new Vector3f();
+		size = new Vector2f();
 	}
 	
 	/**
@@ -64,7 +69,7 @@ public abstract class Entity {
 	 * 
 	 * @return The Location of the entity
 	 */
-	public Vector2f getRotation() {
+	public Vector3f getRotation() {
 		return rotation;
 	}
 	
@@ -73,7 +78,7 @@ public abstract class Entity {
 	 * 
 	 * @param r The rotation of the entity
 	 */
-	public void setRotation(Vector2f r) {
+	public void setRotation(Vector3f r) {
 		rotation = r;
 	}
 	
@@ -94,6 +99,38 @@ public abstract class Entity {
 	public void setSize(Vector2f s) {
 		size = s;
 	}
+
+	/**
+	 * Sets the location of the entity in opengl
+	 * before rendering.
+	 */
+	protected void setTranslationGL(){
+		// translate to the right location and prepare to draw
+		GL11.glTranslatef(location.getX(), location.getY(), 0);
+	}
+	
+	/**
+	 * Sets the location of the entity in opengl plus
+	 * the parameter values before rendering.
+	 * 
+	 * @param x The value to add x
+	 * @param y The value to add y
+	 */
+	protected void setTranslationGL(float x, float y){
+		// translate to the right location and prepare to draw
+		GL11.glTranslatef(location.getX()+x, location.getY()+y, 0);
+	}
+	
+	/**
+	 * Sets the rotation of the entity in opengl
+	 * before rendering.
+	 */
+	protected void setRotationGL(){
+		// rotating the entity
+        GL11.glRotatef(rotation.getX(), 1.0f, 0.0f, 0.0f); // Rotate On The X Axis
+        GL11.glRotatef(rotation.getY(), 0.0f, 1.0f, 0.0f); // Rotate On The Y Axis
+        GL11.glRotatef(rotation.getZ(), 0.0f, 0.0f, 1.0f); // Rotate On The Z Axis
+	}
 	
 	/**
 	 * the render method should be implemented for every entity

src/ei/engine/scene/Sprite.java

@@ -83,35 +83,47 @@ public class Sprite extends Entity {
 		}
 		return texture.getImageHeight();
 	}
-	
+
 	/**
 	 * Draw the sprite
 	 */
 	public void render() {
 		// store the current model matrix
 		GL11.glPushMatrix();
-
+		//Reset The Current Modelview Matrix
+		GL11.glLoadIdentity();
+		
+		//set rotation of the sprite 
+		// And the rotation
+		setRotationGL();
+		//Set the location
+		setTranslationGL();
+        
 		// bind to the appropriate texture for this sprite
-		texture.bind();
-
-		// translate to the right location and prepare to draw
-		GL11.glTranslatef((int)getLocation().getX(), (int)getLocation().getY(), 0);		
+		texture.bindGL();
 		GL11.glColor3f(1,1,1);
 
 		// draw a quad textured to match the sprite
 		GL11.glBegin(GL11.GL_QUADS);
 		{
+			//Vertex at the upper left
 			GL11.glTexCoord2f(0, 0);
 			GL11.glVertex2f(0, 0);
+			//Vertex at the down left
 			GL11.glTexCoord2f(0, texture.getHeight());
 			GL11.glVertex2f(0, texture.getImageHeight());
+			//Vertex at the upper right
 			GL11.glTexCoord2f(texture.getWidth(), texture.getHeight());
 			GL11.glVertex2f(texture.getImageWidth(),texture.getImageHeight());
+			//Vertex at the down right
 			GL11.glTexCoord2f(texture.getWidth(), 0);
 			GL11.glVertex2f(texture.getImageWidth(),0);
 		}
 		GL11.glEnd();
-
+		
+		
+		//Reset The Current Modelview Matrix
+		GL11.glLoadIdentity();
 		// restore the model view matrix to prevent contamination
 		GL11.glPopMatrix();
 	}