旋转gallery

来源：互联网发布：自制单片机小说阅读器编辑：程序博客网时间：2024/04/29 09:04

public class GalleryFlow extends Gallery {

private Camera mCamera = new Camera();

private int mMaxRotationAngle = 60;

private int mMaxZoom = -120;

private int mCoveflowCenter;

public GalleryFlow(Context context) {

super(context);

this.setStaticTransformationsEnabled(true);

}

public GalleryFlow(Context context, AttributeSet attrs) {

super(context, attrs);

this.setStaticTransformationsEnabled(true);

}

public GalleryFlow(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

this.setStaticTransformationsEnabled(true);

}

public int getMaxRotationAngle() {

return mMaxRotationAngle;

}

public void setMaxRotationAngle(int maxRotationAngle) {

mMaxRotationAngle = maxRotationAngle;

}

public int getMaxZoom() {

return mMaxZoom;

}

public void setMaxZoom(int maxZoom) {

mMaxZoom = maxZoom;

}

private int getCenterOfCoverflow() {

return (getWidth() - getPaddingLeft() - getPaddingRight()) / 2

+ getPaddingLeft();

}

private static int getCenterOfView(View view) {

return view.getLeft() + view.getWidth() / 2;

}

protected boolean getChildStaticTransformation(View child, Transformation t) {

final int childCenter = getCenterOfView(child);

final int childWidth = child.getWidth();

int rotationAngle = 0;

t.clear();

t.setTransformationType(Transformation.TYPE_MATRIX);

if (childCenter == mCoveflowCenter) {

transformImageBitmap((ImageView) child, t, 0);

} else {

rotationAngle = (int) (((float) (mCoveflowCenter - childCenter) / childWidth) * mMaxRotationAngle);

if (Math.abs(rotationAngle) > mMaxRotationAngle) {

rotationAngle = (rotationAngle < 0) ? -mMaxRotationAngle

: mMaxRotationAngle;

}

transformImageBitmap((ImageView) child, t, rotationAngle);

}

return true;

}

protected void onSizeChanged(int w, int h, int oldw, int oldh) {

mCoveflowCenter = getCenterOfCoverflow();

super.onSizeChanged(w, h, oldw, oldh);

}

private void transformImageBitmap(ImageView child, Transformation t,

int rotationAngle) {

mCamera.save();

final Matrix imageMatrix = t.getMatrix();

final int imageHeight = child.getLayoutParams().height;

final int imageWidth = child.getLayoutParams().width;

final int rotation = Math.abs(rotationAngle);

}

// ￔￚZￖ￡￉ￏￕ�ￏ￲ￒￆﾶﾯcameraﾵￄￊￓﾽￇﾣﾬￊﾵﾼￊ￐ﾧﾹ￻ￎﾪﾷￅﾴ￳ￍﾼￆﾬﾡﾣ

// ￈￧ﾹ￻ￔￚYￖ￡￉ￏￒￆﾶﾯﾣﾬￔ￲ￍﾼￆﾬ￉ￏￏￂￒￆﾶﾯﾣﾻXￖ￡￉ￏﾶￔￓﾦￍﾼￆﾬￗ￳ￓￒￒￆﾶﾯﾡﾣ

mCamera.translate(0.0f, 0.0f, 100.0f);

// As the angle of the view gets less, zoom in

if (rotation < mMaxRotationAngle) {

float zoomAmount = (float) (mMaxZoom + (rotation * 1.5));

mCamera.translate(0.0f, 0.0f, zoomAmount);

}

// ￔￚYￖ￡￉ￏ￐�ￗﾪﾣﾬﾶￔￓﾦￍﾼￆﾬￊ￺ￏ￲ￏ￲￀￯ﾷﾭￗﾪﾡﾣ

// ￈￧ﾹ￻ￔￚXￖ￡￉ￏ￐�ￗﾪﾣﾬￔ￲ﾶￔￓﾦￍﾼￆﾬﾺ￡ￏ￲ￏ￲￀￯ﾷﾭￗﾪﾡﾣ

mCamera.rotateY(rotationAngle);

mCamera.getMatrix(imageMatrix);

imageMatrix.preTranslate(-(imageWidth / 2), -(imageHeight / 2));

imageMatrix.postTranslate((imageWidth / 2), (imageHeight / 2));

mCamera.restore();

}