AndEngine Example(9):EaseFunctionExample

目标：

1. 了解什么是EaseFunction

2. 了解几种类型的EaseFunction

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package org.andengine.examples;

import org.andengine.engine.camera.Camera;
import org.andengine.engine.camera.hud.HUD;
import org.andengine.engine.options.EngineOptions;
import org.andengine.engine.options.ScreenOrientation;
import org.andengine.engine.options.resolutionpolicy.RatioResolutionPolicy;
import org.andengine.entity.modifier.MoveModifier;
import org.andengine.entity.primitive.Line;
import org.andengine.entity.scene.Scene;
import org.andengine.entity.sprite.Sprite;
import org.andengine.entity.text.Text;
import org.andengine.entity.util.FPSLogger;
import org.andengine.input.touch.TouchEvent;
import org.andengine.opengl.font.Font;
import org.andengine.opengl.texture.ITexture;
import org.andengine.opengl.texture.TextureOptions;
import org.andengine.opengl.texture.atlas.bitmap.BitmapTextureAtlas;
import org.andengine.opengl.texture.atlas.bitmap.BitmapTextureAtlasTextureRegionFactory;
import org.andengine.opengl.texture.region.ITextureRegion;
import org.andengine.ui.activity.SimpleBaseGameActivity;
import org.andengine.util.modifier.ease.EaseBackIn;
import org.andengine.util.modifier.ease.EaseBackInOut;
import org.andengine.util.modifier.ease.EaseBackOut;
import org.andengine.util.modifier.ease.EaseBounceIn;
import org.andengine.util.modifier.ease.EaseBounceInOut;
import org.andengine.util.modifier.ease.EaseBounceOut;
import org.andengine.util.modifier.ease.EaseCircularIn;
import org.andengine.util.modifier.ease.EaseCircularInOut;
import org.andengine.util.modifier.ease.EaseCircularOut;
import org.andengine.util.modifier.ease.EaseCubicIn;
import org.andengine.util.modifier.ease.EaseCubicInOut;
import org.andengine.util.modifier.ease.EaseCubicOut;
import org.andengine.util.modifier.ease.EaseElasticIn;
import org.andengine.util.modifier.ease.EaseElasticInOut;
import org.andengine.util.modifier.ease.EaseElasticOut;
import org.andengine.util.modifier.ease.EaseExponentialIn;
import org.andengine.util.modifier.ease.EaseExponentialInOut;
import org.andengine.util.modifier.ease.EaseExponentialOut;
import org.andengine.util.modifier.ease.EaseLinear;
import org.andengine.util.modifier.ease.EaseQuadIn;
import org.andengine.util.modifier.ease.EaseQuadInOut;
import org.andengine.util.modifier.ease.EaseQuadOut;
import org.andengine.util.modifier.ease.EaseQuartIn;
import org.andengine.util.modifier.ease.EaseQuartInOut;
import org.andengine.util.modifier.ease.EaseQuartOut;
import org.andengine.util.modifier.ease.EaseQuintIn;
import org.andengine.util.modifier.ease.EaseQuintInOut;
import org.andengine.util.modifier.ease.EaseQuintOut;
import org.andengine.util.modifier.ease.EaseSineIn;
import org.andengine.util.modifier.ease.EaseSineInOut;
import org.andengine.util.modifier.ease.EaseSineOut;
import org.andengine.util.modifier.ease.EaseStrongIn;
import org.andengine.util.modifier.ease.EaseStrongInOut;
import org.andengine.util.modifier.ease.EaseStrongOut;
import org.andengine.util.modifier.ease.IEaseFunction;

import android.graphics.Color;
import android.graphics.Typeface;

/**
* (c) 2010 Nicolas Gramlich
* (c) 2011 Zynga
*
* @author Nicolas Gramlich
* @since 15:12:16 - 30.07.2010
*/
public class EaseFunctionExample extends SimpleBaseGameActivity {
// ===========================================================
// Constants
// ===========================================================

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

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

private Camera mCamera;

private Font mFont;

private BitmapTextureAtlas mBitmapTextureAtlas;
private ITextureRegion mBadgeTextureRegion;
private ITextureRegion mNextTextureRegion;

private static final IEaseFunction[][] EASEFUNCTIONS = new IEaseFunction[][]{
new IEaseFunction[] {
EaseLinear.getInstance(),
EaseLinear.getInstance(),
EaseLinear.getInstance()
},
new IEaseFunction[] {
EaseBackIn.getInstance(),
EaseBackOut.getInstance(),
EaseBackInOut.getInstance()
},
new IEaseFunction[] {
EaseBounceIn.getInstance(),
EaseBounceOut.getInstance(),
EaseBounceInOut.getInstance()
},
new IEaseFunction[] {
EaseCircularIn.getInstance(),
EaseCircularOut.getInstance(),
EaseCircularInOut.getInstance()
},
new IEaseFunction[] {
EaseCubicIn.getInstance(),
EaseCubicOut.getInstance(),
EaseCubicInOut.getInstance()
},
new IEaseFunction[] {
EaseElasticIn.getInstance(),
EaseElasticOut.getInstance(),
EaseElasticInOut.getInstance()
},
new IEaseFunction[] {
EaseExponentialIn.getInstance(),
EaseExponentialOut.getInstance(),
EaseExponentialInOut.getInstance()
},
new IEaseFunction[] {
EaseQuadIn.getInstance(),
EaseQuadOut.getInstance(),
EaseQuadInOut.getInstance()
},
new IEaseFunction[] {
EaseQuartIn.getInstance(),
EaseQuartOut.getInstance(),
EaseQuartInOut.getInstance()
},
new IEaseFunction[] {
EaseQuintIn.getInstance(),
EaseQuintOut.getInstance(),
EaseQuintInOut.getInstance()
},
new IEaseFunction[] {
EaseSineIn.getInstance(),
EaseSineOut.getInstance(),
EaseSineInOut.getInstance()
},
new IEaseFunction[] {
EaseStrongIn.getInstance(),
EaseStrongOut.getInstance(),
EaseStrongInOut.getInstance()
}
};

private int mCurrentEaseFunctionSet = 0;

private final Sprite[] mBadges = new Sprite[3];
private final Text[] mEaseFunctionNameTexts = new Text[3];

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

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

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

@Override
public EngineOptions onCreateEngineOptions() {
this.mCamera = new Camera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT);

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

@Override
public void onCreateResources() {
/* The font. */
final ITexture fontTexture = new BitmapTextureAtlas(this.getTextureManager(), 256, 256, TextureOptions.BILINEAR);
this.mFont = new Font(this.getFontManager(), fontTexture, Typeface.create(Typeface.DEFAULT, Typeface.BOLD), 32, true, Color.WHITE);
this.mFont.load();

/* The textures. */
this.mBitmapTextureAtlas = new BitmapTextureAtlas(this.getTextureManager(), 256, 128, TextureOptions.BILINEAR);
BitmapTextureAtlasTextureRegionFactory.setAssetBasePath("gfx/");
this.mNextTextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mBitmapTextureAtlas, this, "next.png", 0, 0);
this.mBadgeTextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mBitmapTextureAtlas, this, "badge.png", 97, 0);

this.mBitmapTextureAtlas.load();
}

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

final Scene scene = new Scene();

final HUD hud = new HUD();

final Sprite nextSprite = new Sprite(CAMERA_WIDTH - 100 - this.mNextTextureRegion.getWidth(), 0, this.mNextTextureRegion, this.getVertexBufferObjectManager()) {
@Override
public boolean onAreaTouched(final TouchEvent pSceneTouchEvent, final float pTouchAreaLocalX, final float pTouchAreaLocalY) {
if(pSceneTouchEvent.isActionDown()) {
EaseFunctionExample.this.next();
}
return true;
};
};
final Sprite previousSprite = new Sprite(100, 0, this.mNextTextureRegion, this.getVertexBufferObjectManager()) {
@Override
public boolean onAreaTouched(final TouchEvent pSceneTouchEvent, final float pTouchAreaLocalX, final float pTouchAreaLocalY) {
if(pSceneTouchEvent.isActionDown()) {
EaseFunctionExample.this.previous();
}
return true;
};
};
previousSprite.setFlippedHorizontal(true);

hud.attachChild(nextSprite);
hud.attachChild(previousSprite);

hud.registerTouchArea(nextSprite);
hud.registerTouchArea(previousSprite);

this.mCamera.setHUD(hud);

/* Create the sprites that will be moving. */

this.mBadges[0] = new Sprite(0, CAMERA_HEIGHT - 300, this.mBadgeTextureRegion, this.getVertexBufferObjectManager());
this.mBadges[1] = new Sprite(0, CAMERA_HEIGHT - 200, this.mBadgeTextureRegion, this.getVertexBufferObjectManager());
this.mBadges[2] = new Sprite(0, CAMERA_HEIGHT - 100, this.mBadgeTextureRegion, this.getVertexBufferObjectManager());

this.mEaseFunctionNameTexts[0] = new Text(0, CAMERA_HEIGHT - 250, this.mFont, "Function", 20, this.getVertexBufferObjectManager());
this.mEaseFunctionNameTexts[1] = new Text(0, CAMERA_HEIGHT - 150, this.mFont, "Function", 20, this.getVertexBufferObjectManager());
this.mEaseFunctionNameTexts[2] = new Text(0, CAMERA_HEIGHT - 50, this.mFont, "Function", 20, this.getVertexBufferObjectManager());

scene.attachChild(this.mBadges[0]);
scene.attachChild(this.mBadges[1]);
scene.attachChild(this.mBadges[2]);
scene.attachChild(this.mEaseFunctionNameTexts[0]);
scene.attachChild(this.mEaseFunctionNameTexts[1]);
scene.attachChild(this.mEaseFunctionNameTexts[2]);
scene.attachChild(new Line(0, CAMERA_HEIGHT - 110, CAMERA_WIDTH, CAMERA_HEIGHT - 110, this.getVertexBufferObjectManager()));
scene.attachChild(new Line(0, CAMERA_HEIGHT - 210, CAMERA_WIDTH, CAMERA_HEIGHT - 210, this.getVertexBufferObjectManager()));
scene.attachChild(new Line(0, CAMERA_HEIGHT - 310, CAMERA_WIDTH, CAMERA_HEIGHT - 310, this.getVertexBufferObjectManager()));

return scene;
}

@Override
public void onGameCreated() {
this.reanimate();
}

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

public void next() {
this.mCurrentEaseFunctionSet++;
this.mCurrentEaseFunctionSet %= EASEFUNCTIONS.length;
this.reanimate();
}

public void previous() {
this.mCurrentEaseFunctionSet--;
if(this.mCurrentEaseFunctionSet < 0) {
this.mCurrentEaseFunctionSet += EASEFUNCTIONS.length;
}

this.reanimate();
}

private void reanimate() {
this.runOnUpdateThread(new Runnable() {
@Override
public void run() {
final IEaseFunction[] currentEaseFunctionsSet = EASEFUNCTIONS[EaseFunctionExample.this.mCurrentEaseFunctionSet];
final Text[] easeFunctionNameTexts = EaseFunctionExample.this.mEaseFunctionNameTexts;
final Sprite[] faces = EaseFunctionExample.this.mBadges;

for(int i = 0; i < 3; i++) {
easeFunctionNameTexts[i].setText(currentEaseFunctionsSet[i].getClass().getSimpleName());
final Sprite face = faces[i];
face.clearEntityModifiers();

final float y = face.getY();
face.setPosition(0, y);
face.registerEntityModifier(new MoveModifier(3, 0, CAMERA_WIDTH - face.getWidth(), y, y, currentEaseFunctionsSet[i]));
}
}
});
}

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

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EaseFunctions 改变了修饰符的作用过程。

修饰符修饰对象在默认情况下是线性的。

而如果采用了不同类型的EaseFunction，则可以将其变为非线性的一个过程。

只上传了InOut类型的，单独In和Out可以类推出来

(1)EaseBackInOut



(2)EaseBounceInOut

这个可用于模拟球掉落地面的效果



(3)EaseCubicInOut

三次曲线的，可模拟电梯的运动

Cubic是立方体的意思。



(4)EaseElasticInOut

用于仿真弹簧或者橡胶棒



(5)EaseExponentialInOut



其实还有集中类型的EaseFunction，但觉得区别不是特别大，所以就没有将图贴出来了。

详情见API。