Rotate3DAnimation.java 文件源码

@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
    final float fromDegrees = mFromDegrees;
    float degrees = fromDegrees + ((mToDegrees - fromDegrees) * interpolatedTime);
    final float centerX = mCenterX;
    final float centerY = mCenterY;
    final Camera camera = mCamera;
    final Matrix matrix = t.getMatrix();
    camera.save();

    // 调节深度
    if (mReverse)
        camera.translate(0.0f, 0.0f, mDepthZ * interpolatedTime);
    else
        camera.translate(0.0f, 0.0f, mDepthZ * (1.0f - interpolatedTime));

    // 绕y轴旋转
    camera.rotateY(degrees);
    camera.getMatrix(matrix);
    camera.restore();

    // 修正失真，主要修改 MPERSP_0 和 MPERSP_1
    float[] mValues = new float[9];
    matrix.getValues(mValues);              //获取数值
    mValues[6] = mValues[6] / scale;        //数值修正
    mValues[7] = mValues[7] / scale;        //数值修正
    matrix.setValues(mValues);              //重新赋值

    // 调节中心点
    matrix.preTranslate(-centerX, -centerY);
    matrix.postScale(centerX, centerY);

}