本文为转载文章，但是希望更多的朋友来优化该算法。
旋转算法如下：
| Rotation[degrees counterclockwise] | Subscript Manipulation using Pixels |
| 0 | Out[i, j] = In[i, j] |
| 90 | Out[j, Right-i-1] = In[i, j] |
| 180 | Out[Right-i-1, Bottom-j-1] = In[i, j] |
| 270 | Out[Bottom-j-1,i] = In[i, j] |
i代表x轴的值，j代表Y轴上的值
privateWriteableBitmap
WBRotate(WriteableBitmap wb, intCounterclockwiseAngle) { int[,]
wb_arr = newint[wb.PixelWidth,
wb.PixelHeight]; //导致许多缺页中断的初始化循环 //for
(int r = 0; r < wb.PixelHeight; r++)// r=row c=column //{ //
for (int c = 0; c < wb.PixelWidth; c++) //
{ //
wb_arr[c, r] = wb.Pixels[wb.PixelWidth * r + c]; //
} //} //导致较少缺页中断的初始化循环
对上面代码的简单优化 for(intc
= 0; c < wb.PixelWidth; c++)//
r=row c=column { for(intr
= 0; r < wb.PixelHeight; r++) { wb_arr[c,
r] = wb.Pixels[wb.PixelWidth * r + c]; } } WriteableBitmap
wb2; int[,]
wb_arr_2; if(CounterclockwiseAngle
== 0 || CounterclockwiseAngle == 360 || CounterclockwiseAngle == -360)//0度
360度 { wb2
= newWriteableBitmap(wb.PixelWidth,
wb.PixelHeight); wb_arr_2
= newint[wb.PixelWidth,
wb.PixelHeight]; wb_arr_2
= wb_arr; }