Android翻页效果，电子书(15)

          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 + pageTurnCorner.x, this.mOuterOffsetY + oppositeCorner.y);    
          this.mBackgroundPath.lineTo(this.mOuterOffsetX + x1, this.mOuterOffsetY + y1);    
   
          return page_slope;    
      }    
   
      private void drawBackground(Canvas canvas) {    
          canvas.save();    
//        canvas.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG|Paint.FILTER_BITMAP_FLAG));    
          canvas.clipPath(this.mBackgroundPath, Region.Op.INTERSECT);    
          canvas.translate(this.mOuterOffsetX, this.mOuterOffsetY);    
              
          if (this.mPageBackground != null) {    
              this.mPageBackground.setBounds(0, 0, this.mChildRect.right, this.mChildRect.bottom);    
   
              this.mPageBackground.draw(canvas);    
          }    
          if (this.mPage != null) {    
              this.mPage.drawBackground(canvas);