实例介绍
【实例简介】
【实例截图】
【核心代码】
package com.kaixinbook; import android.content.Context; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.ColorMatrix; import android.graphics.ColorMatrixColorFilter; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.Path; import android.graphics.PointF; import android.graphics.Region; import android.graphics.drawable.GradientDrawable; import android.view.MotionEvent; import android.view.View; import android.widget.Scroller; /** * 控制页面画出贝塞尔曲线 * * @author yuanhang * */ public class PageWidget extends View { private int mScreenWidth = 480; // 屏幕宽 private int mScreenHeight = 800; // 屏幕高 private int mCornerX = 1; // 拖拽点对应的页脚 private int mCornerY = 1; private Path mPath0; private Path mPath1; Bitmap mCurPageBitmap = null; // 当前页 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; ColorMatrixColorFilter mColorMatrixFilter; Matrix mMatrix; float[] mMatrixArray = { 0, 0, 0, 0, 0, 0, 0, 0, 1.0f }; boolean mIsRTandLB; // 是否属于右上左下 float mMaxLength = (float) Math.hypot(mScreenWidth, mScreenHeight); int[] mBackShadowColors;// 背面颜色组 int[] mFrontShadowColors;// 前面颜色组 GradientDrawable mBackShadowDrawableLR; // 有阴影的GradientDrawable GradientDrawable mBackShadowDrawableRL; GradientDrawable mFolderShadowDrawableLR; GradientDrawable mFolderShadowDrawableRL; GradientDrawable mFrontShadowDrawableHBT; GradientDrawable mFrontShadowDrawableHTB; GradientDrawable mFrontShadowDrawableVLR; GradientDrawable mFrontShadowDrawableVRL; Paint mPaint; Scroller mScroller; public PageWidget(Context context, int width, int height) { super(context); mPath0 = new Path(); mPath1 = new Path(); mScreenWidth = width; mScreenHeight = height; mPaint = new Paint(); mPaint.setStyle(Paint.Style.FILL); createDrawable(); ColorMatrix cm = new ColorMatrix(); float array[] = { 0.55f, 0, 0, 0, 80.0f, 0, 0.55f, 0, 0, 80.0f, 0, 0, 0.55f, 0, 80.0f, 0, 0, 0, 0.2f, 0 }; cm.set(array); mColorMatrixFilter = new ColorMatrixColorFilter(cm); mMatrix = new Matrix(); mScroller = new Scroller(getContext()); mTouch.x = 0.01f; // 不让x,y为0,否则在点计算时会有问题 mTouch.y = 0.01f; } /** * 计算拖拽点对应的拖拽脚 * * @param x * @param y */ public void calcCornerXY(float x, float y) { if (x <= mScreenWidth / 2) mCornerX = 0; else mCornerX = mScreenWidth; if (y <= mScreenHeight / 2) mCornerY = 0; else mCornerY = mScreenHeight; if ((mCornerX == 0 && mCornerY == mScreenHeight) || (mCornerX == mScreenWidth && mCornerY == 0)) mIsRTandLB = true; else mIsRTandLB = false; } public boolean doTouchEvent(MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_MOVE) { mTouch.x = event.getX(); mTouch.y = event.getY(); this.postInvalidate(); } if (event.getAction() == MotionEvent.ACTION_DOWN) { mTouch.x = event.getX(); mTouch.y = event.getY(); // calcCornerXY(mTouch.x, mTouch.y); // this.postInvalidate(); } if (event.getAction() == MotionEvent.ACTION_UP) { // if (canDragOver()) { // startAnimation(1200); // } else { // mTouch.x = mCornerX - 10f; // mTouch.y = mCornerY - 10f; // } // 直接画出动画而不使用时上面的条件判断 startAnimation(1200); this.postInvalidate(); } // return super.onTouchEvent(event); return true; } /** * 求解直线P1P2和直线P3P4的交点坐标 * * @param P1 * @param P2 * @param P3 * @param P4 * @return */ 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; // 当mBezierStart1.x < 0或者mBezierStart1.x > 480时 // 如果继续翻页,会出现BUG故在此限制 if (mTouch.x > 0 && mTouch.x < mScreenWidth) { if (mBezierStart1.x < 0 || mBezierStart1.x > mScreenWidth) { if (mBezierStart1.x < 0) mBezierStart1.x = mScreenWidth - mBezierStart1.x; float f1 = Math.abs(mCornerX - mTouch.x); float f2 = mScreenWidth * f1 / mBezierStart1.x; mTouch.x = Math.abs(mCornerX - f2); float f3 = Math.abs(mCornerX - mTouch.x) * Math.abs(mCornerY - mTouch.y) / f1; mTouch.y = Math.abs(mCornerY - f3); 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; } } mBezierStart2.x = mCornerX; mBezierStart2.y = mBezierControl2.y - (mCornerY - mBezierControl2.y) / 2; 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; } 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)); int leftx; int rightx; GradientDrawable mBackShadowDrawable; if (mIsRTandLB) { leftx = (int) (mBezierStart1.x); rightx = (int) (mBezierStart1.x mTouchToCornerDis / 4); mBackShadowDrawable = mBackShadowDrawableLR; } else { leftx = (int) (mBezierStart1.x - mTouchToCornerDis / 4); rightx = (int) mBezierStart1.x; mBackShadowDrawable = mBackShadowDrawableRL; } 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) { mCurPageBitmap = bm1; mNextPageBitmap = bm2; } public void setScreen(int w, int h) { mScreenWidth = w; mScreenHeight = h; } @Override protected void onDraw(Canvas canvas) { canvas.drawColor(0xFFAAAAAA); calcPoints(); drawCurrentPageArea(canvas, mCurPageBitmap, mPath0); drawNextPageAreaAndShadow(canvas, mNextPageBitmap); drawCurrentPageShadow(canvas); drawCurrentBackArea(canvas, mCurPageBitmap); } /** * 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[] { 0x80111111, 0x111111 }; 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); } /** * 绘制翻起页的阴影 * * @param canvas */ public void drawCurrentPageShadow(Canvas canvas) { double degree; if (mIsRTandLB) { degree = Math.PI / 4 - Math.atan2(mBezierControl1.y - mTouch.y, mTouch.x - mBezierControl1.x); } else { degree = Math.PI / 4 - Math.atan2(mTouch.y - mBezierControl1.y, mTouch.x - mBezierControl1.x); } // 翻起页阴影顶点与touch点的距离 double d1 = (float) 25 * 1.414 * Math.cos(degree); double d2 = (float) 25 * 1.414 * Math.sin(degree); float x = (float) (mTouch.x d1); float y; if (mIsRTandLB) { y = (float) (mTouch.y d2); } else { y = (float) (mTouch.y - d2); } 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 1; 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 - mMaxLength), 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 1); mCurrentPageShadow = mFrontShadowDrawableHBT; } rotateDegrees = (float) Math.toDegrees(Math.atan2(mBezierControl2.y - mTouch.y, mBezierControl2.x - mTouch.x)); canvas.rotate(rotateDegrees, mBezierControl2.x, mBezierControl2.y); float temp; if (mBezierControl2.y < 0) temp = mBezierControl2.y - mScreenHeight; else temp = mBezierControl2.y; int hmg = (int) Math.hypot(mBezierControl2.x, temp); if (hmg > mMaxLength) mCurrentPageShadow .setBounds((int) (mBezierControl2.x - 25) - hmg, leftx, (int) (mBezierControl2.x mMaxLength) - hmg, rightx); else mCurrentPageShadow.setBounds( (int) (mBezierControl2.x - mMaxLength), leftx, (int) (mBezierControl2.x), rightx); // Log.i("hmg", "mBezierControl2.x " mBezierControl2.x // " mBezierControl2.y " mBezierControl2.y); mCurrentPageShadow.draw(canvas); canvas.restore(); } /** * 绘制翻起页背面 * * @param canvas * @param bitmap */ private void drawCurrentBackArea(Canvas canvas, Bitmap bitmap) { int i = (int) (mBezierStart1.x mBezierControl1.x) / 2; float f1 = Math.abs(i - mBezierControl1.x); int i1 = (int) (mBezierStart2.y mBezierControl2.y) / 2; float f2 = Math.abs(i1 - mBezierControl2.y); float f3 = Math.min(f1, f2); mPath1.reset(); mPath1.moveTo(mBeziervertex2.x, mBeziervertex2.y); mPath1.lineTo(mBeziervertex1.x, mBeziervertex1.y); mPath1.lineTo(mBezierEnd1.x, mBezierEnd1.y); mPath1.lineTo(mTouch.x, mTouch.y); mPath1.lineTo(mBezierEnd2.x, mBezierEnd2.y); mPath1.close(); GradientDrawable mFolderShadowDrawable; int left; int right; if (mIsRTandLB) { left = (int) (mBezierStart1.x - 1); right = (int) (mBezierStart1.x f3 1); mFolderShadowDrawable = mFolderShadowDrawableLR; } else { left = (int) (mBezierStart1.x - f3 - 1); right = (int) (mBezierStart1.x 1); mFolderShadowDrawable = mFolderShadowDrawableRL; } canvas.save(); canvas.clipPath(mPath0); canvas.clipPath(mPath1, Region.Op.INTERSECT); mPaint.setColorFilter(mColorMatrixFilter); float dis = (float) Math.hypot(mCornerX - mBezierControl1.x, mBezierControl2.y - mCornerY); float f8 = (mCornerX - mBezierControl1.x) / dis; float f9 = (mBezierControl2.y - mCornerY) / dis; mMatrixArray[0] = 1 - 2 * f9 * f9; mMatrixArray[1] = 2 * f8 * f9; mMatrixArray[3] = mMatrixArray[1]; mMatrixArray[4] = 1 - 2 * f8 * f8; mMatrix.reset(); mMatrix.setValues(mMatrixArray); mMatrix.preTranslate(-mBezierControl1.x, -mBezierControl1.y); mMatrix.postTranslate(mBezierControl1.x, mBezierControl1.y); canvas.drawBitmap(bitmap, mMatrix, mPaint); // canvas.drawBitmap(bitmap, mMatrix, null); mPaint.setColorFilter(null); canvas.rotate(mDegrees, mBezierStart1.x, mBezierStart1.y); mFolderShadowDrawable.setBounds(left, (int) mBezierStart1.y, right, (int) (mBezierStart1.y mMaxLength)); mFolderShadowDrawable.draw(canvas); canvas.restore(); } public void computeScroll() { super.computeScroll(); if (mScroller.computeScrollOffset()) { float x = mScroller.getCurrX(); float y = mScroller.getCurrY(); mTouch.x = x; mTouch.y = y; postInvalidate(); } } private void startAnimation(int delayMillis) { int dx, dy; // dx 水平方向滑动的距离,负值会使滚动向左滚动 // dy 垂直方向滑动的距离,负值会使滚动向上滚动 if (mCornerX > 0) { dx = -(int) (mScreenWidth mTouch.x); } else { dx = (int) (mScreenWidth - mTouch.x mScreenWidth); } if (mCornerY > 0) { dy = (int) (mScreenHeight - mTouch.y); } else { dy = (int) (1 - mTouch.y); // 防止mTouch.y最终变为0 } mScroller.startScroll((int) mTouch.x, (int) mTouch.y, dx, dy, delayMillis); } public void abortAnimation() { if (!mScroller.isFinished()) { mScroller.abortAnimation(); } } /** * 是否能够拖动过去 * * @return */ public boolean canDragOver() { if (mTouchToCornerDis > mScreenWidth / 10) return true; return false; } /** * 是否从左边翻向右边 * * @return */ public boolean DragToRight() { if (mCornerX > 0) return false; return true; } }
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