android 3d 旋转

在javaeye里看到了关于3d旋转的文章，可是博主没有透入什么技术细节。由于一直想做出那种旋转效果，所以就想啊想，终于想出来了（我是个小菜鸟）。呵呵，不管怎样，希望对想做还没做出来的朋友一些帮助。

先上一个效果图：

这是你想要的吗？如果是就继续往下看吧。

其实，这个效果是用animation配合camera做出来的，相信大家在apidemo里面看过类似的。

那么先写一个继承animation的类：Rotate3d

Rotate3d代码

public class Rotate3d extends Animation {
    private float mFromDegree;
    private float mToDegree;
    private float mCenterX;
    private float mCenterY;
    private float mLeft;
    private float mTop;
    private Camera mCamera;
    private static final String TAG = "Rotate3d";

    public Rotate3d(float fromDegree, float toDegree, float left, float top,
            float centerX, float centerY) {
        this.mFromDegree = fromDegree;
        this.mToDegree = toDegree;
        this.mLeft = left;
        this.mTop = top;
        this.mCenterX = centerX;
        this.mCenterY = centerY;

    }

    @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) {
        final float FromDegree = mFromDegree;
        float degrees = FromDegree + (mToDegree - mFromDegree)
                * interpolatedTime;
        final float centerX = mCenterX;
        final float centerY = mCenterY;
        final Matrix matrix = t.getMatrix();

        if (degrees <= -76.0f) {
             degrees = -90.0f;
             mCamera.save();
             mCamera.rotateY(degrees);
             mCamera.getMatrix(matrix);
             mCamera.restore();
        } else if(degrees >=76.0f){
            degrees = 90.0f;
            mCamera.save();
            mCamera.rotateY(degrees);
            mCamera.getMatrix(matrix);
            mCamera.restore();
        }else{
            mCamera.save();
                       //这里很重要哦。
            mCamera.translate(0, 0, centerX);
            mCamera.rotateY(degrees);
            mCamera.translate(0, 0, -centerX);
            mCamera.getMatrix(matrix);
            mCamera.restore();
        }

        matrix.preTranslate(-centerX, -centerY);
        matrix.postTranslate(centerX, centerY);
    }
}

有了这个类一切都会变得简单的，接着只要在activity中写两个Rotate3d的对象，让两个view,分别做这两个对象的animation就好了。（原来就这么简单啊！无语）

Activity代码

//下面两句很关键哦，呵呵，心照不宣。
        Rotate3d leftAnimation = new Rotate3d(-0, -90, 0, 0, mCenterX, mCenterY);
        Rotate3d rightAnimation = new Rotate3d(-0+90, -90+90, 0.0f, 0.0f, mCenterX, mCenterY);

        leftAnimation.setFillAfter(true);
        leftAnimation.setDuration(1000);
        rightAnimation.setFillAfter(true);
        rightAnimation.setDuration(1000);

        mImageView1.startAnimation(leftAnimation);
        mImageView2.startAnimation(rightAnimation);

还要写一下mImageView1,mImageView2的xml,

Xml代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    >

    <FrameLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">

                   <ImageView
                    android:id="@+id/image1"
                    android:layout_gravity="center_horizontal"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:src="@drawable/image1"
                    />
                   <ImageView
                    android:id="@+id/image2"
                    android:background="#ffff0000"
                    android:layout_gravity="center_horizontal"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:src="@drawable/image2"
                    />

    </FrameLayout>
</LinearLayout>

写完收工。

 

代码：https://files.cnblogs.com/shanzei/3dRotateTest2.rar

 

转自：http://harriszhang.iteye.com/blog/721142