帮我用c++和mfc写图像旋转函数TranslationDIB(lpSrcStartBits, lSrcWidth, lSrcHeight, Roat)
时间: 2024-03-03 22:49:44 浏览: 22
好的,这里是一个C++和MFC的图像旋转函数TranslationDIB的实现:
```cpp
void TranslationDIB(BYTE* lpSrcStartBits, LONG lSrcWidth, LONG lSrcHeight, double Roat)
{
// 绕图像中心点旋转
double cx = lSrcWidth / 2.0;
double cy = lSrcHeight / 2.0;
double sinA = sin(Roat);
double cosA = cos(Roat);
// 计算旋转后的图像大小
double x1 = -cx * cosA - (-cy) * sinA;
double y1 = -cx * sinA + (-cy) * cosA;
double x2 = (lSrcWidth - cx) * cosA - (-cy) * sinA;
double y2 = (lSrcWidth - cx) * sinA + (-cy) * cosA;
double x3 = -cx * cosA - (lSrcHeight - cy) * sinA;
double y3 = -cx * sinA + (lSrcHeight - cy) * cosA;
double x4 = (lSrcWidth - cx) * cosA - (lSrcHeight - cy) * sinA;
double y4 = (lSrcWidth - cx) * sinA + (lSrcHeight - cy) * cosA;
int dstWidth = (int)max(max(x1, x2), max(x3, x4)) - (int)min(min(x1, x2), min(x3, x4)) + 1;
int dstHeight = (int)max(max(y1, y2), max(y3, y4)) - (int)min(min(y1, y2), min(y3, y4)) + 1;
// 创建旋转后的图像
BYTE* lpDstStartBits = new BYTE[dstWidth * dstHeight];
memset(lpDstStartBits, 0, dstWidth * dstHeight);
// 计算旋转后的每个像素点
for (int y = 0; y < dstHeight; y++)
{
for (int x = 0; x < dstWidth; x++)
{
double srcX = (double)x * cosA + (double)y * sinA + cx - dstWidth / 2.0;
double srcY = -(double)x * sinA + (double)y * cosA + cy - dstHeight / 2.0;
int srcX0 = (int)floor(srcX);
int srcY0 = (int)floor(srcY);
int srcX1 = srcX0 + 1;
int srcY1 = srcY0 + 1;
if (srcX0 >= 0 && srcX1 < lSrcWidth && srcY0 >= 0 && srcY1 < lSrcHeight)
{
double dx = srcX - srcX0;
double dy = srcY - srcY0;
BYTE* lpSrc00 = lpSrcStartBits + srcY0 * lSrcWidth + srcX0;
BYTE* lpSrc10 = lpSrc00 + 1;
BYTE* lpSrc01 = lpSrc00 + lSrcWidth;
BYTE* lpSrc11 = lpSrc01 + 1;
BYTE* lpDst = lpDstStartBits + y * dstWidth + x;
*lpDst = (BYTE)((1 - dx) * (1 - dy) * (*lpSrc00) + dx * (1 - dy) * (*lpSrc10)
+ (1 - dx) * dy * (*lpSrc01) + dx * dy * (*lpSrc11));
}
}
}
// 把旋转后的图像复制回原图像
memcpy(lpSrcStartBits, lpDstStartBits, dstWidth * dstHeight);
// 释放内存
delete[] lpDstStartBits;
}
```
其中,lpSrcStartBits是指向源图像像素数据的指针,lSrcWidth和lSrcHeight是源图像的宽度和高度,Roat是旋转角度。这个函数使用了双线性插值算法来计算旋转后的像素值。
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