Android翻页效果，电子书(12)

   
          this.mBackPagePath.moveTo(this.mOuterOffsetX + x1, this.mOuterOffsetY + y1);    
          this.mBackPagePath.lineTo(this.mOuterOffsetX + x2, this.mOuterOffsetY + y2);    
          //b到c的那条线，可以考虑画个弧线    
          this.mBackPagePath.lineTo(this.mOuterOffsetX + x0, this.mOuterOffsetY + pageTurnCorner.y);    
//        this.mBackPagePath.arcTo(new RectF(bx,by,cx,cy), 220, 180,false);    
//        this.mBackPagePath.quadTo(ex, ey, cx, cy);    
//        this.mBackPagePath.cubicTo(100, -50, 200, 50, cx, cy);//贝赛尔曲线    
          this.mBackPagePath.lineTo(this.mOuterOffsetX + x1, this.mOuterOffsetY + y1);    
   
              
          this.mBackgroundPath.moveTo(this.mOuterOffsetX + x1, this.mOuterOffsetY + y1);    
          this.mBackgroundPath.lineTo(this.mOuterOffsetX + x0, this.mOuterOffsetY + pageTurnCorner.y);    
          this.mBackgroundPath.lineTo(this.mOuterOffsetX + pageTurnCorner.x, this.mOuterOffsetY + pageTurnCorner.y);    
          this.mBackgroundPath.lineTo(this.mOuterOffsetX + x1, this.mOuterOffsetY + y1);    
   
          return page_slope;    
      }    
          
   
      private float secondHalfPageTurn(PointF pageDim, PointF pageTurnCorner, PointF oppositeCorner, float xPivot, float slope, float y) {    
          float width = pageDim.x;    
          float height = pageDim.y;    
          View child = this.mPage.getChildAt(0);    
          int xOffset = child.getLeft() - this.mPage.getLeft();    
          int yOffset = child.getTop() - this.mPage.getTop();