Roate3dAnimation 实现了围绕y轴竖直方向 或者绕x轴方向旋转的3d动画效果。这个例子来
自Android APIDemo中的一个自定义View动画。他的实现展示自定义View动画的基本步骤。
主要是重写initialize方法，applyTransformation方法。
分析：
在Roate3dAnimation中，我们使用Android.graphic.Camera实现3d效果。
对Camera不熟悉的可看看 android.graphic.Camera 。
public classRotate3dAnimationextendsAnimation {
//开始角度
private floatstartDegree;
//结束角度
private floatendDegree;
/**
* 这个旋转动画围绕在2D空间的中心点执行.你可以用X轴坐标(叫做centerX)和Y轴(叫做centerY)
* 坐标来定义这个中心点
*/
private floatcenterX;
private floatcenterY;
/**
* 控制镜头景深，不需要的话给0值即可
* mReverse 为true，表示反方向，false 表示正方向
*/
private floatdeepZ;
private booleanmReverse;
//用于辅助实现3d效果。
privateCameramCamera;
//X轴方向，或Y轴方向
enumDIRECTION {
X,Y
}
DIRECTIONdirection= DIRECTION.Y;
Rotate3dAnimation(floatfromDegree,floattoDegree,floatcenterX,
floatcenterY,floatdeepZ,booleanreverse) {
this.startDegree= fromDegree;
this.endDegree= toDegree;
this.centerX= centerX;
this.centerY= centerY;
this.deepZ= deepZ;
this.mReverse= reverse;
}
Rotate3dAnimation(floatfromDegree,floattoDegree,floatcenterX,
floatcenterY,floatdeepZ,booleanreverse, 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=newCamera();
}
@Override
protected void applyTransformation( float int erpolatedTime, Transformation t) {
super.applyTransformation(interpolatedTime, t);
float fromDegree =startDegree;
float degree = fromDegree + (endDegree-startDegree) * interpolatedTime;
finalMatrix 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);
}
}
应用：
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();
}
});
原文链接：
