Android实现翻页功能原理
Android实现翻页功能原理
第一种翻页效果如下：
实现原理：
当前手指触摸点为a，则 a点坐标为（ax,ay）， 由三角形acb与三角形cmb为对称三角形并且直线cp为am垂直平分线，则 B点坐标为(ax/2,ay/2)。
作gf垂直于om且cb垂直于am， 三角形cfg与gfm相似，则 cf:gf = gf:mf cf=(gf * gf) / mf gf长度为g点纵坐标 mf长度为g点横坐标
cf长度可求 c点坐标可求 由c点、g点可确定过两点间的直线， 当该直线中x=0时求出与y足交点。
第二种翻页效果
实现原理：
使用贝赛尔曲线。曲线有四个点：起始点、终止点（也称锚点）以及两个相互分离的中间点。滑动两个中间点，贝塞尔曲线的形状会发生变化。
根据第一种翻页效果原理可以确定a、e、h、f、g ，由eh平行于cj且af垂直于eh，则 af垂直于cj则三角形egf相似于三角形cnf 则有ef:cf = gf:nf 。
设n为ag中点 则有cf=(3/2)*ef ,则c点坐标可求 由c点、k点坐标已知可知过两点间的直线
由该直线可计算与y轴相交点j 由a、e、c、j可计算两条直线的相交点b 同理可求点k。
在Android中的具体实现步骤：
起始页展示
1.创建屏幕尺寸的bmp 2.将图片转化为canvas 3.获取起始页面数据 3.在canvas中绘制起始页数据 4.在当前视图中复写onDraw进行重绘出bmp对象
翻页处理
1.初始化时创建两个bmp（bmp1、bmp2）并将其转换为canvas(canvas1、canvas2)
2.获取手势首次触摸的区域 （例：当首次点击屏幕的位置x<50&&y<50则为左上角）
3.根据首次点击区域判断需要展示的数据（例：首次点击处于左侧区域【左上、左下】的则判断操作为下一页操作）
4.获取下一页中数据并绘制出来在canvas2中
5.根据1中获取的区域位置调用起始动画使视图移动到手势首次点击位置
6.获取手势每次移动的坐标并根据移动坐标计算绘制的各个点的坐标
7.每次移动刷新视图
源码示例下载1
源码示例下载2
源码实例1:
项目结构:
PageWidget:
package sf.hmg.turntest; import android.content.Context; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Path; import android.graphics.PointF; import android.graphics.Region; import android.graphics.drawable.GradientDrawable; import android.util.Log; import android.view.MotionEvent; import android.view.View; public class PageWidget extends View { private static final String TAG = "hmg"; private int mWidth = 480; private int mHeight = 800; private int mCornerX = 0; // 拖拽点对应的页脚 private int mCornerY = 0; private Path mPath0; private Path mPath1; Bitmap mCurPageBitmap = null; //当前页 Bitmap mCurPageBackBitmap = null; Bitmap mNextPageBitmap = null; PointF mTouch = new PointF(); // 拖拽点 PointF mBezierStart1 = new PointF(); // 贝塞尔曲线起始点 PointF mBezierControl1 = new PointF(); // 贝塞尔曲线控制点 PointF mBeziervertex1 = new PointF(); // 贝塞尔曲线顶点 PointF mBezierEnd1 = new PointF(); // 贝塞尔曲线结束点 PointF mBezierStart2 = new PointF(); // 另一条贝塞尔曲线 PointF mBezierControl2 = new PointF(); PointF mBeziervertex2 = new PointF(); PointF mBezierEnd2 = new PointF(); float mMiddleX; float mMiddleY; float mDegrees; float mTouchToCornerDis; boolean mIsRTandLB; // 是否属于右上左下 // for test float mMaxLength = (float) Math.hypot(480, 800); int[] mBackShadowColors; int[] mFrontShadowColors; GradientDrawable mBackShadowDrawableLR; GradientDrawable mBackShadowDrawableRL; GradientDrawable mFolderShadowDrawableLR; GradientDrawable mFolderShadowDrawableRL; GradientDrawable mFrontShadowDrawableHBT; GradientDrawable mFrontShadowDrawableHTB; GradientDrawable mFrontShadowDrawableVLR; GradientDrawable mFrontShadowDrawableVRL; private Bitmap mBitmap; private Canvas mCanvas; private Paint mBitmapPaint; Paint paint; public PageWidget(Context context) { super(context); // TODO Auto-generated constructor stub mPath0 = new Path(); mPath1 = new Path(); createDrawable(); // --------------------------------------- mBitmap = Bitmap.createBitmap(480, 800, Bitmap.Config.ARGB_8888); mCanvas = new Canvas(mBitmap); mBitmapPaint = new Paint(Paint.DITHER_FLAG); mCurPageBitmap = Bitmap.createBitmap(480, 800, Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(mCurPageBitmap); paint = new Paint(); canvas.drawColor(Color.YELLOW); canvas.drawBitmap(mCurPageBitmap, 0, 0, paint); mNextPageBitmap = Bitmap .createBitmap(480, 800, Bitmap.Config.ARGB_8888); canvas = new Canvas(mNextPageBitmap); canvas.drawColor(Color.GREEN); canvas.drawBitmap(mNextPageBitmap, 0, 0, paint); } /** * Author : hmg25 * Version: 1.0 * Description : 计算拖拽点对应的拖拽脚 */ private void calcCornerXY(float x, float y) { if (x <= mWidth / 2) mCornerX = 0; else mCornerX = mWidth; if (y <= mHeight / 2) mCornerY = 0; else mCornerY = mHeight; if ((mCornerX == 0 && mCornerY == mHeight) || (mCornerX == mWidth && mCornerY == 0)) mIsRTandLB = true; else mIsRTandLB = false; } @Override public boolean onTouchEvent(MotionEvent event) { // TODO Auto-generated method stub if (event.getAction() == MotionEvent.ACTION_MOVE) { mCanvas.drawColor(0xFFAAAAAA); mTouch.x = event.getX(); mTouch.y = event.getY(); this.postInvalidate(); } if (event.getAction() == MotionEvent.ACTION_DOWN) { mCanvas.drawColor(0xFFAAAAAA); mTouch.x = event.getX(); mTouch.y = event.getY(); calcCornerXY(mTouch.x, mTouch.y); this.postInvalidate(); } if (event.getAction() == MotionEvent.ACTION_UP) { mCanvas.drawColor(0xFFAAAAAA); mTouch.x = mCornerX; mTouch.y = mCornerY; this.postInvalidate(); } // return super.onTouchEvent(event); return true; } /** * Author : Administrator * Version: 1.0 * Description : 求解直线P1P2和直线P3P4的交点坐标 */ public PointF getCross(PointF P1, PointF P2, PointF P3, PointF P4) { PointF CrossP = new PointF(); // 二元函数通式： y=ax+b float a1 = (P2.y - P1.y) / (P2.x - P1.x); float b1 = ((P1.x * P2.y) - (P2.x * P1.y)) / (P1.x - P2.x); float a2 = (P4.y - P3.y) / (P4.x - P3.x); float b2 = ((P3.x * P4.y) - (P4.x * P3.y)) / (P3.x - P4.x); CrossP.x = (b2 - b1) / (a1 - a2); CrossP.y = a1 * CrossP.x + b1; return CrossP; } private void calcPoints() { mMiddleX = (mTouch.x + mCornerX) / 2; mMiddleY = (mTouch.y + mCornerY) / 2; mBezierControl1.x = mMiddleX - (mCornerY - mMiddleY) * (mCornerY - mMiddleY) / (mCornerX - mMiddleX); mBezierControl1.y = mCornerY; mBezierControl2.x = mCornerX; mBezierControl2.y = mMiddleY - (mCornerX - mMiddleX) * (mCornerX - mMiddleX) / (mCornerY - mMiddleY); Log.i("hmg", "mTouchX " + mTouch.x + " mTouchY " + mTouch.y); Log.i("hmg", "mBezierControl1.x " + mBezierControl1.x + " mBezierControl1.y " + mBezierControl1.y); Log.i("hmg", "mBezierControl2.x " + mBezierControl2.x + " mBezierControl2.y " + mBezierControl2.y); mBezierStart1.x = mBezierControl1.x - (mCornerX - mBezierControl1.x) / 2; mBezierStart1.y = mCornerY; mBezierStart2.x = mCornerX; mBezierStart2.y = mBezierControl2.y - (mCornerY - mBezierControl2.y) / 2; Log.i("hmg", "mBezierStart1.x " + mBezierStart1.x + " mBezierStart1.y " + mBezierStart1.y); Log.i("hmg", "mBezierStart2.x " + mBezierStart2.x + " mBezierStart2.y " + mBezierStart2.y); mTouchToCornerDis = (float) Math.hypot((mTouch.x - mCornerX), (mTouch.y - mCornerY)); mBezierEnd1 = getCross(mTouch, mBezierControl1, mBezierStart1, mBezierStart2); mBezierEnd2 = getCross(mTouch, mBezierControl2, mBezierStart1, mBezierStart2); Log.i("hmg", "mBezierEnd1.x " + mBezierEnd1.x + " mBezierEnd1.y " + mBezierEnd1.y); Log.i("hmg", "mBezierEnd2.x " + mBezierEnd2.x + " mBezierEnd2.y " + mBezierEnd2.y); /* * mBeziervertex1.x 推导 * ((mBezierStart1.x+mBezierEnd1.x)/2+mBezierControl1.x)/2 化简等价于 * (mBezierStart1.x+ 2*mBezierControl1.x+mBezierEnd1.x) / 4 */ mBeziervertex1.x = (mBezierStart1.x + 2 * mBezierControl1.x + mBezierEnd1.x) / 4; mBeziervertex1.y = (2 * mBezierControl1.y + mBezierStart1.y + mBezierEnd1.y) / 4; mBeziervertex2.x = (mBezierStart2.x + 2 * mBezierControl2.x + mBezierEnd2.x) / 4; mBeziervertex2.y = (2 * mBezierControl2.y + mBezierStart2.y + mBezierEnd2.y) / 4; Log.i("hmg", "mBeziervertex1.x " + mBeziervertex1.x + " mBeziervertex1.y " + mBeziervertex1.y); Log.i("hmg", "mBeziervertex2.x " + mBeziervertex2.x + " mBeziervertex2.y " + mBeziervertex2.y); } private void drawCurrentPageArea(Canvas canvas, Bitmap bitmap, Path path) { mPath0.reset(); mPath0.moveTo(mBezierStart1.x, mBezierStart1.y); mPath0.quadTo(mBezierControl1.x, mBezierControl1.y, mBezierEnd1.x, mBezierEnd1.y); mPath0.lineTo(mTouch.x, mTouch.y); mPath0.lineTo(mBezierEnd2.x, mBezierEnd2.y); mPath0.quadTo(mBezierControl2.x, mBezierControl2.y, mBezierStart2.x, mBezierStart2.y); mPath0.lineTo(mCornerX, mCornerY); mPath0.close(); canvas.save(); canvas.clipPath(path, Region.Op.XOR); canvas.drawBitmap(bitmap, 0, 0, null); canvas.restore(); } private void drawNextPageAreaAndShadow(Canvas canvas, Bitmap bitmap) { mPath1.reset(); mPath1.moveTo(mBezierStart1.x, mBezierStart1.y); mPath1.lineTo(mBeziervertex1.x, mBeziervertex1.y); mPath1.lineTo(mBeziervertex2.x, mBeziervertex2.y); mPath1.lineTo(mBezierStart2.x, mBezierStart2.y); mPath1.lineTo(mCornerX, mCornerY); mPath1.close(); mDegrees = (float) Math.toDegrees(Math.atan2(mBezierControl1.x - mCornerX, mBezierControl2.y - mCornerY)); float f5 = mTouchToCornerDis /4; int leftx; int rightx; GradientDrawable mBackShadowDrawable; if(mIsRTandLB) { leftx=(int)(mBezierStart1.x - 1); rightx= (int)(mBezierStart1.x +mTouchToCornerDis /4+ 1); mBackShadowDrawable=mBackShadowDrawableLR; }else { leftx=(int)(mBezierStart1.x - mTouchToCornerDis/4 - 1); rightx= (int) mBezierStart1.x + 1; mBackShadowDrawable=mBackShadowDrawableRL; } Log.i("hmg", "leftx " + leftx + " rightx " + rightx); canvas.save(); canvas.clipPath(mPath0); canvas.clipPath(mPath1, Region.Op.INTERSECT); canvas.drawBitmap(bitmap, 0, 0, null); canvas.rotate(mDegrees, mBezierStart1.x, mBezierStart1.y); mBackShadowDrawable.setBounds(leftx, (int)mBezierStart1.y, rightx, (int) (mMaxLength + mBezierStart1.y)); mBackShadowDrawable.draw(canvas); canvas.restore(); } public void setBitmaps(Bitmap bm1, Bitmap bm2, Bitmap bm3) { mCurPageBitmap = bm1; mCurPageBackBitmap = bm2; mNextPageBitmap = bm3; } @Override protected void onDraw(Canvas canvas) { canvas.drawColor(0xFFAAAAAA); calcPoints(); drawCurrentPageArea(mCanvas, mCurPageBitmap, mPath0); drawNextPageAreaAndShadow(mCanvas, mNextPageBitmap); drawCurrentPageShadow(mCanvas); canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint); } /** * Author : hmg25 * Version: 1.0 * Description : 创建阴影的GradientDrawable */ private void createDrawable() { int[] color = { 0x333333, 0xB0333333 }; mFolderShadowDrawableRL = new GradientDrawable( GradientDrawable.Orientation.RIGHT_LEFT, color); mFolderShadowDrawableRL .setGradientType(GradientDrawable.LINEAR_GRADIENT); mFolderShadowDrawableLR = new GradientDrawable( GradientDrawable.Orientation.LEFT_RIGHT, color); mFolderShadowDrawableLR.setGradientType(GradientDrawable.LINEAR_GRADIENT); mBackShadowColors = new int[] { 0xFF111111, 0x111111 }; mBackShadowDrawableRL = new GradientDrawable( GradientDrawable.Orientation.RIGHT_LEFT, mBackShadowColors); mBackShadowDrawableRL.setGradientType(GradientDrawable.LINEAR_GRADIENT); mBackShadowDrawableLR = new GradientDrawable( GradientDrawable.Orientation.LEFT_RIGHT, mBackShadowColors); mBackShadowDrawableLR.setGradientType(GradientDrawable.LINEAR_GRADIENT); mFrontShadowColors = new int[] { 0x80888888, 0x888888 }; mFrontShadowDrawableVLR = new GradientDrawable( GradientDrawable.Orientation.LEFT_RIGHT, mFrontShadowColors); mFrontShadowDrawableVLR.setGradientType(GradientDrawable.LINEAR_GRADIENT); mFrontShadowDrawableVRL = new GradientDrawable( GradientDrawable.Orientation.RIGHT_LEFT, mFrontShadowColors); mFrontShadowDrawableVRL.setGradientType(GradientDrawable.LINEAR_GRADIENT); mFrontShadowDrawableHTB = new GradientDrawable( GradientDrawable.Orientation.TOP_BOTTOM, mFrontShadowColors); mFrontShadowDrawableHTB.setGradientType(GradientDrawable.LINEAR_GRADIENT); mFrontShadowDrawableHBT = new GradientDrawable( GradientDrawable.Orientation.BOTTOM_TOP, mFrontShadowColors); mFrontShadowDrawableHBT.setGradientType(GradientDrawable.LINEAR_GRADIENT); } public void drawCurrentPageShadow(Canvas canvas) { //注：拖拽顶点的阴影，定位有问题，待修改~~ double d1 = Math.atan2(mBezierControl1.y - mTouch.y, mTouch.x-mBezierControl1.x); // double d3 =(float)Math.cos(d1) * 25*1.414f; double d3 =(float) 25/Math.cos(d1) ; // float x = (float)(mTouch.x-d3); // float y = mTouch.y -(float)Math.sin(d1) * 25*1.414f; float x = (float)(mTouch.x-d3); float y =(float)( mTouch.y -d3); mPath1.reset(); mPath1.moveTo(x, y); mPath1.lineTo(mTouch.x, mTouch.y); mPath1.lineTo(mBezierControl1.x, mBezierControl1.y); mPath1.lineTo(mBezierStart1.x, mBezierStart1.y); mPath1.close(); float rotateDegrees; canvas.save(); canvas.clipPath(mPath0, Region.Op.XOR); canvas.clipPath(mPath1,Region.Op.INTERSECT); int leftx; int rightx; GradientDrawable mCurrentPageShadow; if(mIsRTandLB) { leftx=(int)(mBezierControl1.x); rightx= (int)mBezierControl1.x+25; mCurrentPageShadow=mFrontShadowDrawableVLR; }else { leftx=(int)(mBezierControl1.x-25); rightx= (int) mBezierControl1.x; mCurrentPageShadow=mFrontShadowDrawableVRL; } rotateDegrees= (float)Math.toDegrees(Math.atan2(mTouch.x-mBezierControl1.x,mBezierControl1.y-mTouch.y)); canvas.rotate(rotateDegrees, mBezierControl1.x, mBezierControl1.y); mCurrentPageShadow.setBounds(leftx, (int)(mBezierControl1.y-500), rightx, (int)(mBezierControl1.y)); mCurrentPageShadow.draw(canvas); canvas.restore(); mPath1.reset(); mPath1.moveTo(x, y); mPath1.lineTo(mTouch.x, mTouch.y); mPath1.lineTo(mBezierControl2.x, mBezierControl2.y); mPath1.lineTo(mBezierStart2.x, mBezierStart2.y); mPath1.close(); canvas.save(); canvas.clipPath(mPath0, Region.Op.XOR); canvas.clipPath(mPath1,Region.Op.INTERSECT); if(mIsRTandLB) { leftx=(int)(mBezierControl2.y); rightx=(int)(mBezierControl2.y+25); mCurrentPageShadow=mFrontShadowDrawableHTB; }else { leftx=(int)(mBezierControl2.y-25); rightx=(int)(mBezierControl2.y); mCurrentPageShadow=mFrontShadowDrawableHBT; } rotateDegrees= (float)Math.toDegrees(Math.atan2(mBezierControl2.y-mTouch.y,mBezierControl2.x-mTouch.x)); canvas.rotate( rotateDegrees, mBezierControl2.x, mBezierControl2.y); mCurrentPageShadow.setBounds((int)(mBezierControl2.x-500),leftx , (int)(mBezierControl2.x), rightx ); mCurrentPageShadow.draw(canvas); canvas.restore(); } }
turntest:
package sf.hmg.turntest; import android.app.Activity; import android.os.Bundle; import android.view.Window; import android.view.WindowManager; public class turntest extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags( WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); setContentView(new PageWidget(this)); } }
实例1效果图:
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实例2代码:
工程结构图:
MainActivity:
package com.xin.book; import java.util.ArrayList; import java.util.List; import android.app.Activity; import android.os.Bundle; import com.xin.book.view.BookAdapter; import com.xin.book.view.BookLayout; public class MainActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); BookLayout bk = new BookLayout(this); List<String> str = new ArrayList<String>(); str.add("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"); str.add("bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"); str.add("ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc"); str.add("ddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd"); str.add("eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee"); str.add("fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"); BookAdapter ba = new BookAdapter(this); ba.addItem(str); bk.setPageAdapter(ba); setContentView(bk); } }
BookAdapter:
package com.xin.book.view; import java.util.ArrayList; import java.util.List; import android.content.Context; import android.graphics.Color; import android.view.View; import android.view.ViewGroup.LayoutParams; import android.widget.FrameLayout; import android.widget.TextView; import com.xin.book.R; public class BookAdapter implements IAdapter{ private List<String> strList = new ArrayList<String>(); private Context mContext; public BookAdapter(Context context) { super(); this.mContext = context; } public void addItem(List<String> list){ strList.addAll(list); } public int getCount() { return strList.size(); } public String getItem(int position) { return strList.get(position); } public long getItemId(int position) { return position; } public View getView(int position) { TextView textView = new TextView(mContext); textView.setText(strList.get(position)); textView.setTextColor(Color.BLACK); textView.setTextSize(32); textView.setBackgroundColor(Color.WHITE); textView.setBackgroundResource(R.drawable.ly); textView.setPadding(10, 10, 10, 10); textView.setLayoutParams(new FrameLayout.LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT)); return textView; } }
BookLayout:
package com.xin.book.view; import java.util.Date; import android.content.Context; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.LinearGradient; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.Path; import android.graphics.Point; import android.graphics.PorterDuffXfermode; import android.graphics.Shader; import android.graphics.PorterDuff.Mode; import android.os.Handler; import android.util.AttributeSet; import android.util.Log; import android.view.GestureDetector; import android.view.MotionEvent; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.View; import android.view.GestureDetector.OnGestureListener; import android.widget.FrameLayout; import android.widget.LinearLayout; public class BookLayout extends FrameLayout { public static final String LOG_TAG = "HarHar"; private int totalPageNum; private Context mContext; private boolean hasInit = false; private final int defaultWidth = 600, defaultHeight = 400; private int contentWidth = 0; private int contentHeight = 0; private View currentPage,middlePage,nextPage,prevPage; private LinearLayout invisibleLayout; private LinearLayout mainLayout; private BookView mBookView; private Handler aniEndHandle; private static boolean closeBook = false; private Corner mSelectCorner; private final int clickCornerLen = 250 * 250; // 50dip private float scrollX = 0, scrollY = 0; private int indexPage = 0; private BookState mState; private Point aniStartPos; private Point aniStopPos; private Date aniStartTime; private long aniTime = 800; private long timeOffset = 10; // private Listener mListener; private BookAdapter mPageAdapter; private GestureDetector mGestureDetector; private BookOnGestureListener mGestureListener; public BookLayout(Context context) { super(context); Init(context); } public BookLayout(Context context, AttributeSet attrs) { super(context, attrs); Init(context); } public BookLayout(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); Init(context); } public void setPageAdapter(BookAdapter pa) { Log.d(LOG_TAG, "setPageAdapter"); mPageAdapter = pa; } public void Init(Context context) { Log.d(LOG_TAG, "Init"); totalPageNum = 0; mContext = context; mSelectCorner = Corner.None; mGestureListener = new BookOnGestureListener(); mGestureDetector = new GestureDetector(mGestureListener); mGestureDetector.setIsLongpressEnabled(false); aniEndHandle = new Handler(); this.setOnTouchListener(touchListener); this.setLongClickable(true); } protected void dispatchDraw(Canvas canvas) { Log.d(LOG_TAG, "dispatchDraw"); super.dispatchDraw(canvas); if (!hasInit) { hasInit = true; indexPage = 0; if (mPageAdapter == null) { throw new RuntimeException("please set the PageAdapter on init"); } totalPageNum = mPageAdapter.getCount(); mainLayout = new LinearLayout(mContext); mainLayout.setLayoutParams(new LayoutParams(contentWidth, contentHeight)); mainLayout.setBackgroundColor(0xffffffff); mState = BookState.READY; invisibleLayout = new LinearLayout(mContext); invisibleLayout.setLayoutParams(new LayoutParams(contentWidth, contentHeight)); this.addView(invisibleLayout); this.addView(mainLayout); mBookView = new BookView(mContext); mBookView.setLayoutParams(new LayoutParams(contentWidth, contentHeight)); this.addView(mBookView); updatePageView(); invalidate(); } else if (mState == BookState.READY) { mBookView.update(); } } /** * 此方法做过修改，改成一页显示 */ public void updatePageView() { Log.d(LOG_TAG, "updatePageView"); if (indexPage < 0 || indexPage > totalPageNum - 1) { return; } invisibleLayout.removeAllViews(); mainLayout.removeAllViews(); /*当前页*/ currentPage = mPageAdapter.getView(indexPage); if(currentPage == null){ currentPage = new WhiteView(mContext); } currentPage.setLayoutParams(new LayoutParams(contentWidth,contentHeight)); mainLayout.addView(currentPage); /*背景页*/ middlePage = new WhiteView(mContext); middlePage.setLayoutParams(new LayoutParams(contentWidth,contentHeight)); invisibleLayout.addView(middlePage); /*前一页*/ prevPage = null; if(indexPage>0){ prevPage = mPageAdapter.getView(indexPage-1); } if(prevPage==null){ prevPage = new WhiteView(mContext); } prevPage.setLayoutParams(new LayoutParams(contentWidth,contentHeight)); invisibleLayout.addView(prevPage); /*后一页*/ nextPage = null; if(indexPage<totalPageNum-1){ nextPage = mPageAdapter.getView(indexPage + 1); } if(nextPage==null){ nextPage = new WhiteView(mContext); } nextPage.setLayoutParams(new LayoutParams(contentWidth,contentHeight)); invisibleLayout.addView(nextPage); Log.d(LOG_TAG, "updatePageView finish"); } OnTouchListener touchListener = new OnTouchListener() { public boolean onTouch(View v, MotionEvent event) { Log.d(LOG_TAG, "onTouch " + " x: " + event.getX() + " y: " + event.getY() + " mState:" + mState); mGestureDetector.onTouchEvent(event); int action = event.getAction(); if (action == MotionEvent.ACTION_UP && mSelectCorner != Corner.None && mState == BookState.TRACKING) { if (mState == BookState.ANIMATING) return false; if(mSelectCorner == Corner.LeftTop){ if(scrollX<contentWidth/2){ aniStopPos = new Point(0,0); }else{ aniStopPos = new Point(2*contentWidth,0); } }else if(mSelectCorner == Corner.RightTop){ if(scrollX<contentWidth/2){ aniStopPos = new Point(-contentWidth,0); }else{ aniStopPos = new Point(contentWidth,0); } }else if(mSelectCorner == Corner.LeftBottom){ if(scrollX<contentWidth/2){ aniStopPos = new Point(0,contentHeight); }else{ aniStopPos = new Point(2*contentWidth,contentHeight); } }else if(mSelectCorner == Corner.RightBottom){ if(scrollX<contentWidth/2){ aniStopPos = new Point(-contentWidth,contentHeight); }else{ aniStopPos = new Point(contentWidth,contentHeight); } } aniStartPos = new Point((int) scrollX, (int) scrollY); aniTime = 800; mState = BookState.ABOUT_TO_ANIMATE; closeBook = true; aniStartTime = new Date(); mBookView.startAnimation(); } return false; } }; class BookOnGestureListener implements OnGestureListener { public boolean onDown(MotionEvent event) { Log.d(LOG_TAG, "onDown"); if (mState == BookState.ANIMATING) return false; float x = event.getX(), y = event.getY(); int w = contentWidth, h = contentHeight; if (x * x + y * y < clickCornerLen) { if (indexPage > 0) { mSelectCorner = Corner.LeftTop; aniStartPos = new Point(0, 0); } } else if ((x - w) * (x - w) + y * y < clickCornerLen) { if (indexPage < totalPageNum - 1) { mSelectCorner = Corner.RightTop; aniStartPos = new Point(contentWidth, 0); } } else if (x * x + (y - h) * (y - h) < clickCornerLen) { if (indexPage > 0) { mSelectCorner = Corner.LeftBottom; aniStartPos = new Point(0, contentHeight); } } else if ((x - w) * (x - w) + (y - h) * (y - h) < clickCornerLen) { if (indexPage < totalPageNum - 1) { mSelectCorner = Corner.RightBottom; aniStartPos = new Point(contentWidth, contentHeight); } } if (mSelectCorner != Corner.None) { aniStopPos = new Point((int) x, (int) y); aniTime = 800; mState = BookState.ABOUT_TO_ANIMATE; closeBook = false; aniStartTime = new Date(); mBookView.startAnimation(); } return false; } public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { Log.d(LOG_TAG, "onFling velocityX:" + velocityX + " velocityY:" + velocityY); if (mSelectCorner != Corner.None) { if (mSelectCorner == Corner.LeftTop) { if (velocityX < 0) { aniStopPos = new Point(0, 0); } else { aniStopPos = new Point(2*contentWidth, 0); } }else if( mSelectCorner == Corner.RightTop){ if (velocityX < 0) { aniStopPos = new Point(-contentWidth, 0); } else { aniStopPos = new Point(contentWidth, 0); } }else if (mSelectCorner == Corner.LeftBottom ) { if (velocityX < 0) { aniStopPos = new Point(0, contentHeight); } else { aniStopPos = new Point(2*contentWidth, contentHeight); } }else if( mSelectCorner == Corner.RightBottom){ if (velocityX < 0) { aniStopPos = new Point(-contentWidth, contentHeight); } else { aniStopPos = new Point(contentWidth, contentHeight); } } Log.d(LOG_TAG, "onFling animate"); aniStartPos = new Point((int) scrollX, (int) scrollY); aniTime = 1000; mState = BookState.ABOUT_TO_ANIMATE; closeBook = true; aniStartTime = new Date(); mBookView.startAnimation(); } return false; } public void onLongPress(MotionEvent e) { Log.d(LOG_TAG, "onLongPress"); } public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { mState = BookState.TRACKING; if (mSelectCorner != Corner.None) { scrollX = e2.getX(); scrollY = e2.getY(); mBookView.startAnimation(); } return false; } public void onShowPress(MotionEvent e) { Log.d(LOG_TAG, "onShowPress"); } public boolean onSingleTapUp(MotionEvent e) { Log.d(LOG_TAG, "onSingleTapUp"); if (mSelectCorner != Corner.None) { if (mSelectCorner == Corner.LeftTop) { if (scrollX < contentWidth / 2) { aniStopPos = new Point(0, 0); } else { aniStopPos = new Point(2*contentWidth, 0); } } else if(mSelectCorner == Corner.RightTop){ if (scrollX < contentWidth / 2) { aniStopPos = new Point(-contentWidth, 0); } else { aniStopPos = new Point(contentWidth, 0); } }else if (mSelectCorner == Corner.LeftBottom) { if (scrollX < contentWidth / 2) { aniStopPos = new Point(0, contentHeight); } else { aniStopPos = new Point(2*contentWidth, contentHeight); } }else if(mSelectCorner == Corner.RightBottom){ if (scrollX < contentWidth / 2) { aniStopPos = new Point(-contentWidth, contentHeight); } else { aniStopPos = new Point(contentWidth, contentHeight); } } aniStartPos = new Point((int) scrollX, (int) scrollY); aniTime = 800; mState = BookState.ABOUT_TO_ANIMATE; closeBook = true; aniStartTime = new Date(); mBookView.startAnimation(); } return false; } } protected void onFinishInflate() { Log.d(LOG_TAG, "onFinishInflate"); super.onFinishInflate(); } protected void onLayout(boolean changed, int l, int t, int r, int b) { super.onLayout(changed, l, t, r, b); contentWidth = this.getWidth(); contentHeight = this.getHeight(); if (contentWidth == 0) contentWidth = defaultWidth; if (contentHeight == 0) contentHeight = defaultHeight; Log.d(LOG_TAG, "onLayout, width:" + contentWidth + " height:" + contentHeight); } class BookView extends SurfaceView implements SurfaceHolder.Callback { DrawThread dt; SurfaceHolder surfaceHolder; Paint mDarkPaint = new Paint(); Paint mPaint = new Paint(); Bitmap tmpBmp = Bitmap.createBitmap(contentWidth, contentHeight, Bitmap.Config.ARGB_8888); Canvas mCanvas = new Canvas(tmpBmp); Paint bmpPaint = new Paint(); Paint ivisiblePaint = new Paint(); public BookView(Context context) { super(context); surfaceHolder = getHolder(); surfaceHolder.addCallback(this); mDarkPaint.setColor(0x88000000); Shader mLinearGradient = new LinearGradient(0, 0, contentWidth, 0, new int[] { 0x00000000, 0x33000000, 0x00000000 }, new float[] { 0.35f, 0.5f, 0.65f }, Shader.TileMode.MIRROR); mPaint.setAntiAlias(true); mPaint.setShader(mLinearGradient); bmpPaint.setFilterBitmap(true); bmpPaint.setAntiAlias(true); ivisiblePaint.setAlpha(0); ivisiblePaint.setFilterBitmap(true); ivisiblePaint.setAntiAlias(true); ivisiblePaint.setXfermode(new PorterDuffXfermode(Mode.DST_IN)); } public void startAnimation() { if (dt == null) { Log.d(LOG_TAG, "startAnimation"); dt = new DrawThread(this, getHolder()); dt.start(); } } public void stopAnimation() { Log.d(LOG_TAG, "stopAnimation"); if (dt != null) { dt.flag = false; Thread t = dt; dt = null; t.interrupt(); } } public void drawLT(Canvas canvas) { double dx = contentWidth - scrollX, dy = scrollY; double len = Math.sqrt(dx * dx + dy * dy); if (len > contentWidth) { scrollX = (float)(contentWidth - contentWidth*dx/len); scrollY = (float)(contentWidth*dy/len); } double px = scrollX; double py = scrollY; double arc = 2 * Math.atan(py / px) * 180 / Math.PI; Matrix m = new Matrix(); m.postTranslate(scrollX - contentWidth, scrollY); m.postRotate((float) (arc), scrollX, scrollY); middlePage.draw(mCanvas); Paint ps = new Paint(); Shader lg1 = new LinearGradient(contentWidth , 0, contentWidth - (float) px, (float) py, new int[] { 0x00000000, 0x33000000, 0x00000000 }, new float[] { 0.35f, 0.5f, 0.65f }, Shader.TileMode.CLAMP); ps.setShader(lg1); mCanvas.drawRect(0, 0, contentWidth , contentHeight, ps); canvas.drawBitmap(tmpBmp, m, bmpPaint); prevPage.draw(mCanvas); Shader lg2 = new LinearGradient(scrollX, scrollY, 0, 0, new int[] { 0x00000000, 0x33000000, 0x00000000 }, new float[] { 0.35f, 0.5f, 0.65f }, Shader.TileMode.CLAMP); ps.setShader(lg2); mCanvas.drawRect(0, 0, contentWidth , contentHeight, ps); arc = arc * Math.PI / 360; Path path = new Path(); double r = Math.sqrt(px * px + py * py); double p1 = r / (2 * Math.cos(arc)); double p2 = r / (2 * Math.sin(arc)); Log.d(LOG_TAG, "p1: " + p1 + " p2:" + p2); if (arc == 0) { path.moveTo((float) p1, 0); path.lineTo(contentWidth , 0); path.lineTo(contentWidth , contentHeight); path.lineTo((float) p1, contentHeight); path.close(); } else if (p2 > contentHeight || p2 < 0) { double p3 = (p2 - contentHeight) * Math.tan(arc); path.moveTo((float) p1, 0); path.lineTo(contentWidth , 0); path.lineTo(contentWidth , contentHeight); path.lineTo((float) p3, contentHeight); path.close(); } else { path.moveTo((float) p1, 0); path.lineTo(contentWidth , 0); path.lineTo(contentWidth , contentHeight); path.lineTo(0, contentHeight); path.lineTo(0, (float) p2); path.close(); } mCanvas.drawPath(path, ivisiblePaint); canvas.drawBitmap(tmpBmp, 0, 0, null); } public void drawLB(Canvas canvas) { double dx = contentWidth - scrollX, dy = contentHeight-scrollY; double len = Math.sqrt(dx * dx + dy * dy); if (len > contentWidth ) { scrollX = (float) (contentWidth-contentWidth * dx /len); scrollY = (float) (contentHeight-contentWidth * dy / len); } double px = scrollX; double py = contentHeight - scrollY; double arc = 2 * Math.atan(py / px) * 180 / Math.PI; Matrix m = new Matrix(); m.postTranslate(scrollX - contentWidth , scrollY - contentHeight); m.postRotate((float) (-arc), scrollX, scrollY); middlePage.draw(mCanvas); Paint ps = new Paint(); Shader lg1 = new LinearGradient(contentWidth , contentHeight, contentWidth - (float) px, contentHeight - (float) py, new int[] { 0x00000000, 0x33000000, 0x00000000 }, new float[] { 0.35f, 0.5f, 0.65f }, Shader.TileMode.CLAMP); ps.setShader(lg1); mCanvas.drawRect(0, 0, contentWidth, contentHeight, ps); canvas.drawBitmap(tmpBmp, m, bmpPaint); prevPage.draw(mCanvas); Shader lg2 = new LinearGradient(scrollX, scrollY, 0, contentHeight, new int[] { 0x00000000, 0x33000000, 0x00000000 }, new float[] { 0.35f, 0.5f, 0.65f }, Shader.TileMode.CLAMP); ps.setShader(lg2); mCanvas.drawRect(0, 0, contentWidth, contentHeight, ps); arc = arc * Math.PI / 360; Path path = new Path(); double r = Math.sqrt(px * px + py * py); double p1 = r / (2 * Math.cos(arc)); double p2 = r / (2 * Math.sin(arc)); Log.d(LOG_TAG, "p1: " + p1 + " p2:" + p2); if (arc == 0) { path.moveTo((float) p1, 0); path.lineTo(contentWidth , 0); path.lineTo(contentWidth , contentHeight); path.lineTo((float) p1, contentHeight); path.close(); } else if (p2 > contentHeight || p2 < 0) { double p3 = (p2 - contentHeight) * Math.tan(arc); path.moveTo((float) p3, 0); path.lineTo(contentWidth , 0); path.lineTo(contentWidth , contentHeight); path.lineTo((float) p1, contentHeight); path.close(); } else { path.moveTo(0, 0); path.lineTo(contentWidth , 0); path.lineTo(contentWidth , contentHeight); path.lineTo((float) p1, contentHeight); path.lineTo(0, contentHeight - (float) p2); path.close(); } mCanvas.drawPath(path, ivisiblePaint); canvas.drawBitmap(tmpBmp, 0, 0, null); } public void drawRT(Canvas canvas) { double dx = scrollX , dy = scrollY; double len = Math.sqrt(dx * dx + dy * dy); if (len > contentWidth) { scrollX = (float) (contentWidth * dx /len); scrollY = (float) (contentWidth * dy / len); } double px = contentWidth - scrollX; double py = scrollY; double arc = 2 * Math.atan(py / px) * 180 / Math.PI; Matrix m = new Matrix(); m.postTranslate(scrollX, scrollY); m.postRotate((float) (-arc), scrollX, scrollY); middlePage.draw(mCanvas); Paint ps = new Paint(); Shader lg1 = new LinearGradient(0, 0, (float) px, (float) py, new int[] { 0x00000000, 0x33000000, 0x00000000 }, new float[] { 0.35f, 0.5f, 0.65f }, Shader.TileMode.CLAMP); ps.setShader(lg1); mCanvas.drawRect(0, 0, contentWidth, contentHeight, ps); canvas.drawBitmap(tmpBmp, m, bmpPaint); nextPage.draw(mCanvas); Shader lg2 = new LinearGradient(scrollX - contentWidth, scrollY, contentWidth, 0, new int[] { 0x00000000, 0x33000000, 0x00000000 }, new float[] { 0.35f, 0.5f, 0.65f }, Shader.TileMode.CLAMP); ps.setShader(lg2); mCanvas.drawRect(0, 0, contentWidth, contentHeight, ps); arc = arc * Math.PI / 360; Path path = new Path(); double r = Math.sqrt(px * px + py * py); double p1 = contentWidth - r / (2 * Math.cos(arc)); double p2 = r / (2 * Math.sin(arc)); Log.d(LOG_TAG, "p1: " + p1 + " p2:" + p2); if (arc == 0) { path.moveTo(0, 0); path.lineTo((float) p1, 0); path.lineTo((float) p1, contentHeight); path.lineTo(0, contentHeight); path.close(); } else if (p2 > contentHeight || p2 < 0) { double p3 = contentWidth - (p2 - contentHeight) * Math.tan(arc); path.moveTo(0, 0); path.lineTo((float) p1, 0); path.lineTo((float) p3, contentHeight); path.lineTo(0, contentHeight); path.close(); } else { path.moveTo(0, 0); path.lineTo((float) p1, 0); path.lineTo(contentWidth , (float) p2); path.lineTo(contentWidth , contentHeight); path.lineTo(0, contentHeight); path.close(); } mCanvas.drawPath(path, ivisiblePaint); canvas.drawBitmap(tmpBmp, 0 , 0, null); } public void drawRB(Canvas canvas) { double dx = scrollX , dy = contentHeight - scrollY; double len = Math.sqrt(dx * dx + dy * dy); if (len > contentWidth ) { scrollX = (float) (contentWidth * dx /len); scrollY = (float) (contentHeight-contentWidth * dy / len); } double px = contentWidth - scrollX; double py = contentHeight - scrollY; double arc = 2 * Math.atan(py / px) * 180 / Math.PI; Matrix m = new Matrix(); m.postTranslate(scrollX, scrollY - contentHeight); m.postRotate((float) (arc), scrollX, scrollY); middlePage.draw(mCanvas); Paint ps = new Paint(); Shader lg1 = new LinearGradient(0, contentHeight, (float) px, contentHeight - (float) py, new int[] { 0x00000000, 0x33000000, 0x00000000 }, new float[] { 0.35f, 0.5f, 0.65f }, Shader.TileMode.CLAMP); ps.setShader(lg1); mCanvas.drawRect(0, 0, contentWidth , contentHeight, ps); canvas.drawBitmap(tmpBmp, m, bmpPaint); nextPage.draw(mCanvas); Shader lg2 = new LinearGradient(scrollX - contentWidth , scrollY, contentWidth , contentHeight, new int[] { 0x00000000, 0x33000000, 0x00000000 }, new float[] { 0.35f, 0.5f, 0.65f }, Shader.TileMode.CLAMP); ps.setShader(lg2); mCanvas.drawRect(0, 0, contentWidth , contentHeight, ps); arc = arc * Math.PI / 360; Path path = new Path(); double r = Math.sqrt(px * px + py * py); double p1 = contentWidth - r / (2 * Math.cos(arc)); double p2 = r / (2 * Math.sin(arc)); Log.d(LOG_TAG, "p1: " + p1 + " p2:" + p2); if (arc == 0) { path.moveTo(0, 0); path.lineTo((float) p1, 0); path.lineTo((float) p1, contentHeight); path.lineTo(0, contentHeight); path.close(); } else if (p2 > contentHeight || p2 < 0) { double p3 = contentWidth - (p2 - contentHeight) * Math.tan(arc); path.moveTo(0, 0); path.lineTo((float) p3, 0); path.lineTo((float) p1, contentHeight); path.lineTo(0, contentHeight); path.close(); } else { path.moveTo(0, 0); path.lineTo(contentWidth , 0); path.lineTo(contentWidth , contentHeight - (float) p2); path.lineTo((float) p1, contentHeight); path.lineTo(0, contentHeight); path.close(); } mCanvas.drawPath(path, ivisiblePaint); canvas.drawBitmap(tmpBmp, 0 , 0, null); } public void drawPrevPageEnd(Canvas canvas) { prevPage.draw(mCanvas); canvas.drawBitmap(tmpBmp, 0, 0, null); } public void drawNextPageEnd(Canvas canvas) { nextPage.draw(mCanvas); canvas.drawBitmap(tmpBmp, contentWidth, 0, null); } public void drawPage(Canvas canvas) { if (mSelectCorner == Corner.LeftTop) { Log.d(LOG_TAG, "click left top"); drawLT(canvas); } else if (mSelectCorner == Corner.LeftBottom) { Log.d(LOG_TAG, "click left bottom"); drawLB(canvas); } else if (mSelectCorner == Corner.RightTop) { Log.d(LOG_TAG, "click right top"); drawRT(canvas); } else if (mSelectCorner == Corner.RightBottom) { Log.d(LOG_TAG, "click right bottom"); drawRB(canvas); } } public void update() { Canvas canvas = surfaceHolder.lockCanvas(null); try { synchronized (surfaceHolder) { doDraw(canvas); } } catch (Exception e) { e.printStackTrace(); } finally { if (canvas != null) { surfaceHolder.unlockCanvasAndPost(canvas); } } } protected void doDraw(Canvas canvas) { Log.d(LOG_TAG, "bookView doDraw"); mainLayout.draw(canvas); } public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } public void surfaceCreated(SurfaceHolder holder) { update(); } public void surfaceDestroyed(SurfaceHolder holder) { if (dt != null) { dt.flag = false; dt = null; } } } public boolean getAnimateData() { Log.d(LOG_TAG, "getAnimateData"); long time = aniTime; Date date = new Date(); long t = date.getTime() - aniStartTime.getTime(); t += timeOffset; if (t < 0 || t > time) { mState = BookState.ANIMATE_END; return false; } else { mState = BookState.ANIMATING; double sx = aniStopPos.x - aniStartPos.x; scrollX =(float)(sx*t/time+aniStartPos.x); double sy = aniStopPos.y-aniStartPos.y; scrollY = (float)(sy*t/time+aniStartPos.y); return true; } } public void handleAniEnd(Canvas canvas) { Log.d(LOG_TAG, "handleAniEnd"); if (closeBook) { closeBook = false; if (mSelectCorner == Corner.LeftTop || mSelectCorner == Corner.LeftBottom) { if (scrollX > contentWidth / 2) { indexPage -= 1; mBookView.drawPrevPageEnd(canvas); aniEndHandle.post(new Runnable() { public void run() { updatePageView(); } }); } else { mBookView.doDraw(canvas); } } else if (mSelectCorner == Corner.RightTop || mSelectCorner == Corner.RightBottom) { if (scrollX < contentWidth / 2) { indexPage += 1; mBookView.drawNextPageEnd(canvas); aniEndHandle.post(new Runnable() { public void run() { updatePageView(); } }); } else { mBookView.doDraw(canvas); } } mSelectCorner = Corner.None; mState = BookState.READY; } else { mState = BookState.TRACKING; } mBookView.stopAnimation(); // aniEndHandle.post(new Runnable() { // public void run() { //// BookLayout.this.invalidate(); // } // }); } class WhiteView extends View { public WhiteView(Context context) { super(context); } protected void onDraw(Canvas canvas) { super.onDraw(canvas); canvas.drawColor(Color.WHITE); } } public class DrawThread extends Thread { BookView bv; SurfaceHolder surfaceHolder; boolean flag = false; int sleepSpan = 30; public DrawThread(BookView bv, SurfaceHolder surfaceHolder) { this.bv = bv; this.surfaceHolder = surfaceHolder; this.flag = true; } public void run() { Canvas canvas = null; while (flag) { try { canvas = surfaceHolder.lockCanvas(null); if (canvas == null) continue; synchronized (surfaceHolder) { if (mState == BookState.ABOUT_TO_ANIMATE || mState == BookState.ANIMATING) { bv.doDraw(canvas); getAnimateData(); bv.drawPage(canvas); } else if (mState == BookState.TRACKING) { bv.doDraw(canvas); bv.drawPage(canvas); } else if (mState == BookState.ANIMATE_END) { handleAniEnd(canvas); } } } catch (Exception e) { e.printStackTrace(); } finally { if (canvas != null) { surfaceHolder.unlockCanvasAndPost(canvas); } } try { Thread.sleep(sleepSpan); } catch (Exception e) { e.printStackTrace(); } } } } }
BookState:
package com.xin.book.view; public enum BookState { ABOUT_TO_ANIMATE, ANIMATING, ANIMATE_END, READY, TRACKING }
Corner:
package com.xin.book.view; public enum Corner { LeftTop, RightTop, LeftBottom, RightBottom, None }
IAdapter:
package com.xin.book.view; import android.view.View; public interface IAdapter { public int getCount(); public String getItem(int position); public long getItemId(int position); public View getView(int position); }
IBook:
package com.xin.book.view; import android.view.View; public interface IBook { public View getView(int position); public int getCount(); }
IListener:
package com.xin.book.view; public interface IListener { public void onPrevPage(); public void onNextPage(); public void onInit(); }
实例2效果图:
完O(∩_∩)O~