AndEngine-----CardinalSplineMoveModifierExample學習

剛看了下CardinalSplineMoveModifierExample，將裏面大致看了下，寫了點註釋，代碼主題如下：

public class CardinalSplineMoveModifierExample extends SimpleBaseGameActivity {
	// ===========================================================
	// Constants
	// ===========================================================

	private static final int CAMERA_WIDTH = 720;
	private static final int CAMERA_HEIGHT = 480;

	private static final int COUNT = 400;
	private static final float DURATION = 4;
	private static final float SIZE = 25;

	private static final float[] CONTROLPOINT_1_XS = { 2 * (CAMERA_WIDTH / 4),
			1 * (CAMERA_WIDTH / 4), 1.5f * (CAMERA_WIDTH / 4),
			2 * (CAMERA_WIDTH / 4) };

	private static final float[] CONTROLPOINT_2_XS = { 2 * (CAMERA_WIDTH / 4),
			3 * (CAMERA_WIDTH / 4), 2.5f * (CAMERA_WIDTH / 4),
			2 * (CAMERA_WIDTH / 4) };

	private static final float[] CONTROLPOINT_YS = {
			3.5f * (CAMERA_HEIGHT / 4), 2 * (CAMERA_HEIGHT / 4),
			1 * (CAMERA_HEIGHT / 4), 1.5f * (CAMERA_HEIGHT / 4), };

	// ===========================================================
	// Fields
	// ===========================================================

	// ===========================================================
	// Constructors
	// ===========================================================

	// ===========================================================
	// Getter & Setter
	// ===========================================================

	// ===========================================================
	// Methods for/from SuperClass/Interfaces
	// ===========================================================

	@Override
	public EngineOptions onCreateEngineOptions() {
		final Camera camera = new Camera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT);

		return new EngineOptions(true, ScreenOrientation.LANDSCAPE_FIXED,
				new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT), camera);
	}

	@Override
	public void onCreateResources() {

	}

	@Override
	public Scene onCreateScene() {
		this.mEngine.registerUpdateHandler(new FPSLogger());

		final Scene scene = new Scene();
		scene.setBackground(new Background(0, 0, 0));

		for (int i = 0; i < COUNT; i++) {
			final float tension = MathUtils.random(-0.5f, 0.5f);
			this.addRectangleWithTension(scene, tension,
					MathUtils.random(0, DURATION * 2f));
		}

		return scene;
	}

	private void addRectangleWithTension(final Scene pScene,
			final float pTension, float pDelay) {
		// 聲明矩形
		final Rectangle rectangle = new Rectangle(-SIZE, -SIZE, SIZE, SIZE,
				this.getVertexBufferObjectManager());
		rectangle.setBlendFunction(GLES20.GL_SRC_ALPHA, GLES20.GL_ONE);
		if (pTension < 0) {
			// 此處原本爲rectangle.setColor(1 - pTension, 0, 0, 0.5f);
			// 修改成這樣只是爲了多幾個顏色，好玩而已
			rectangle.setColor(1 - pTension, pDelay, pDelay, 0.5f);
		} else {
			rectangle.setColor(pTension, pDelay, pDelay, 0.5f);
		}
		// 聲明基數樣條修改器
		final CardinalSplineMoveModifierConfig catmullRomMoveModifierConfig1 = new CardinalSplineMoveModifierConfig(
				CardinalSplineMoveModifierExample.CONTROLPOINT_1_XS.length,
				pTension);
		final CardinalSplineMoveModifierConfig catmullRomMoveModifierConfig2 = new CardinalSplineMoveModifierConfig(
				CardinalSplineMoveModifierExample.CONTROLPOINT_1_XS.length,
				pTension);

		for (int i = 0; i < CardinalSplineMoveModifierExample.CONTROLPOINT_1_XS.length; i++) {
			// 設置控制點，catmullRomMoveModifierConfig1表示的是，左邊那半部分
			catmullRomMoveModifierConfig1.setControlPoint(i,
					CardinalSplineMoveModifierExample.CONTROLPOINT_1_XS[i]
							- SIZE / 2,
					CardinalSplineMoveModifierExample.CONTROLPOINT_YS[i] - SIZE
							/ 2);
			// 設置控制點，catmullRomMoveModifierConfig2表示右半部分
			catmullRomMoveModifierConfig2.setControlPoint(i,
					CardinalSplineMoveModifierExample.CONTROLPOINT_2_XS[i]
							- SIZE / 2,
					CardinalSplineMoveModifierExample.CONTROLPOINT_YS[i] - SIZE
							/ 2);
		}
		// 給矩形註冊修改器
		rectangle
				.registerEntityModifier(
				// 聲明一個順序修飾器
				new SequenceEntityModifier(
				// 延遲修飾器
						new DelayModifier(pDelay),
						// 循環修飾器
						new LoopEntityModifier(
								// 順序修飾器
								new SequenceEntityModifier(
										// 集合修飾器
										new ParallelEntityModifier(
												// 基數樣條修飾器
												new CardinalSplineMoveModifier(
														CardinalSplineMoveModifierExample.DURATION,
														catmullRomMoveModifierConfig1,
														EaseLinear
																.getInstance()),
												// 旋轉修飾器
												new RotationModifier(
														CardinalSplineMoveModifierExample.DURATION,
														-45, -315)),
										// 集合修飾器
										new ParallelEntityModifier(
												// 基數樣條修飾器
												new CardinalSplineMoveModifier(
														CardinalSplineMoveModifierExample.DURATION,
														catmullRomMoveModifierConfig2,
														EaseLinear
																.getInstance()),
												// 旋轉修飾器
												new RotationModifier(
														CardinalSplineMoveModifierExample.DURATION,
														45, 315))))));

		pScene.attachChild(rectangle);
	}

	// ===========================================================
	// Methods
	// ===========================================================

	// ===========================================================
	// Inner and Anonymous Classes
	// ===========================================================
}

早上起來，爭取能防着寫一個W形狀出來!