概要：

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Roate3dAnimation 實現了圍繞y軸豎直方向 或者繞x軸方向旋轉的3d動畫效果。這個例子來

自Android APIDemo中的一個自定義View動畫。他的實現展示自定義View動畫的基本步驟。

主要是重寫initialize方法，applyTransformation方法。

分析：

在Roate3dAnimation中，我們使用Android.graphic.Camera實現3d效果。

對Camera不熟悉的可看看?android.graphic.Camera?。

public?class?Rotate3dAnimation?extends?Animation?{

//開始角度

private?float?startDegree;

//結束角度

private?float?endDegree;

/**

*?這個旋轉動畫圍繞在2D空間的中心點執行.你可以用X軸坐標(叫做centerX)和Y軸(叫做centerY)

*?坐標來定義這個中心點

*/

private?float?centerX;

private?float?centerY;

/**

*?控制鏡頭景深，不需要的話給0值即可

*?mReverse?為true，表示反方向，false?表示正方向

*/

private?float?deepZ;

private?boolean?mReverse;

//用于輔助實現3d效果。

private?Camera?mCamera;

//X軸方向，或Y軸方向

enum?DIRECTION?{

X,?Y

}

DIRECTION?direction?=?DIRECTION.Y;

Rotate3dAnimation(float?fromDegree,?float?toDegree,?float?centerX,

float?centerY,?float?deepZ,?boolean?reverse)?{

this.startDegree?=?fromDegree;

this.endDegree?=?toDegree;

this.centerX?=?centerX;

this.centerY?=?centerY;

this.deepZ?=?deepZ;

this.mReverse?=?reverse;

}

Rotate3dAnimation(float?fromDegree,?float?toDegree,?float?centerX,

float?centerY,?float?deepZ,?boolean?reverse,?DIRECTION?direction)?{

this.startDegree?=?fromDegree;

this.endDegree?=?toDegree;

this.centerX?=?centerX;

this.centerY?=?centerY;

this.deepZ?=?deepZ;

this.mReverse?=?reverse;

this.direction?=?direction;

}

@Override

public?void?initialize(int?width,?int?height,?int?parentWidth,?int?parentHeight)?{

super.initialize(width,?height,?parentWidth,?parentHeight);

mCamera?=?new?Camera();

}

@Override

protected?void?applyTransformation(float?interpolatedTime,?Transformation?t)?{

super.applyTransformation(interpolatedTime,?t);

float?fromDegree?=?startDegree;

float?degree?=?fromDegree?+?(endDegree?-?startDegree)?*?interpolatedTime;

final?Matrix?matrix?=?t.getMatrix();

mCamera.save();

if?(mReverse)?{

mCamera.translate(0,?0,?deepZ?*?interpolatedTime);

}?else?{

mCamera.translate(0,?0,?deepZ?*?(1?-?interpolatedTime));

}

if?(direction?==?DIRECTION.Y)?{

mCamera.rotateY(degree);

}?else?{

mCamera.rotateX(degree);

}

mCamera.getMatrix(matrix);

mCamera.restore();

matrix.preTranslate(-centerX,?-centerY);

matrix.postTranslate(centerX,?centerY);

}

}

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應用：

iv_content.post(new?Runnable()?{

@Override

public?void?run()?{

Rotate3dAnimation?rotate3dAnimation?=?new?Rotate3dAnimation(0,?360,?iv_content.getWidth()/2,

0,?0,?true,?Rotate3dAnimation.DIRECTION.Y);

rotate3dAnimation.setDuration(3000);

iv_content.setAnimation(rotate3dAnimation);

rotate3dAnimation.start();

}

});

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小奮斗文章

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