Android翻页效果，电子书(13)

   
          float y1 = 0.0F;    
          float x1 = width - (height + width) * (width - this.mPivotX) / width;    
   
          float x3 = (float)(2.0D * y / (slope + 1.0D / slope));    
          float y3 = height + x3 / slope;    
          float page_slope = (height - y3) / (x3 - this.mPivotX);    
          float b = height - x1 * page_slope;    
          float x2 = (float)((-y - b) / (page_slope + 1.0D / page_slope));    
          float y2 = (x1 - x2) * page_slope;    
   
          if ((this.mCorner & 0x1) != 0) {    
              x1 = width - x1;    
              x2 = width - x2;    
              x3 = width - x3;    
              page_slope = -page_slope;    
          }    
          if ((this.mCorner & 0x2) != 0) {    
              y1 = height - y1;    
              y2 = height - y2;    
              y3 = height - y3;    
              page_slope = -page_slope;    
          }    
   
          float x0 = xPivot;    
   
          this.mForegroundPath.moveTo(xOffset + x1, yOffset + y1);    
          this.mForegroundPath.lineTo(xOffset + oppositeCorner.x, yOffset + oppositeCorner.y);    
          this.mForegroundPath.lineTo(xOffset + oppositeCorner.x, yOffset + pageTurnCorner.y);