如何旋转直流

问题描述

大家好..

我有一个要求.我必须旋转上面涂有位图的DC.但是我不知道该怎么做?下面是示例代码:


///////////////////////////////
HBITMAP m_hBitmapSmall;
CString m_csBitmap;
m_csBitmap ="c://Aircraft.bmp";
m_hBitmapSmall =(HBITMAP)LoadImage(NULL，m_csBitmap.GetBuffer(m_csBitmap.GetLength())，IMAGE_BITMAP，0,0，LR_LOADFROMFILE);

int iFrameWidth = 37，iFrameHeight = 37;
CBitmap * pBmp =新的CBitmap();
CDC tempDC;
tempDC.CreateCompatibleDC(NULL);
tempDC.SetBkMode(TRANSPARENT);
pBmp-> CreateCompatibleBitmap(& tempDC，iFrameWidth，iFrameHeight);
tempDC.SelectObject(pBmp);
CBitmap * pIconBitmap;
pIconBitmap = CBitmap :: FromHandle(m_hBitmapSmall);


CDC tempIconDC;
tempIconDC.CreateCompatibleDC(NULL);
tempIconDC.SetBkMode(TRANSPARENT);
tempIconDC.SelectObject(pIconBitmap);
tempDC.PatBlt(0,0，iFrameWidth，iFrameHeight，BLACKNESS);
tempDC.BitBlt(0,0，iFrameWidth，iFrameHeight，& tempIconDC，0,0，SRCCOPY);//现在您在tempDC上具有位图，因此请使用它.


//在最终发条之前旋转tempDC
//这里需要帮助...


//将tempDC转换为最终DC
pDC-> BitBlt(0,0，iFrameWidth，iFrameHeight，& tempDC，0,0，SRCCOPY); //原始位图

/////////////////////////////////////////////////////

在上面的代码中，在最后一行的tempDC被抹平为(文档视图体系结构的)pDC的最后一行之前，我想根据给定的角度旋转tempDC. Aircraft.bmp是飞机的小型37x37 bmp.因此，当我旋转tempDC时，飞机将自动旋转，因为它已经被粘在tempDC上了.我尝试了几种方法，但是形状是剪切的，这是无法承受的.我每次都无法旋转Aircraft.bmp，因为我一开始就将其加载一次，然后在我收到一个角度时想旋转它.有人可以帮忙吗?我将非常感谢您的帮助...

Hello every one..

I have a requirement. I have to rotate a dc that has a bitmap blitted on it. But i dont know how to do it? Below is the sample code:


////////////////////////////////////////////
HBITMAP m_hBitmapSmall;
CString m_csBitmap;
m_csBitmap = "c://Aircraft.bmp";
m_hBitmapSmall = (HBITMAP)LoadImage(NULL,m_csBitmap.GetBuffer(m_csBitmap.GetLength()),IMAGE_BITMAP,0,0,LR_LOADFROMFILE);

int iFrameWidth = 37, iFrameHeight = 37;
CBitmap* pBmp = new CBitmap();
CDC tempDC;
tempDC.CreateCompatibleDC(NULL);
tempDC.SetBkMode(TRANSPARENT);
pBmp->CreateCompatibleBitmap(&tempDC,iFrameWidth,iFrameHeight);
tempDC.SelectObject(pBmp);
CBitmap *pIconBitmap;
pIconBitmap = CBitmap::FromHandle(m_hBitmapSmall);


CDC tempIconDC;
tempIconDC.CreateCompatibleDC(NULL);
tempIconDC.SetBkMode(TRANSPARENT);
tempIconDC.SelectObject(pIconBitmap);
tempDC.PatBlt(0,0,iFrameWidth,iFrameHeight,BLACKNESS);
tempDC.BitBlt(0,0,iFrameWidth,iFrameHeight,&tempIconDC,0,0,SRCCOPY);//now u have the bitmap on tempDC, so play with it.


//rotate tempDC before final blitting
//help required here...


//blit the tempDC to final DC
pDC->BitBlt(0,0,iFrameWidth,iFrameHeight,&tempDC,0,0,SRCCOPY);//original bitmap

//////////////////////////////////////////////////

In the above code, before teh last line of blitting where tempDC is blitted to pDC (of the document view architecture), i want to rotate the tempDC according to a given angle. The Aircraft.bmp is a small 37x37 bmp of an aircraft. so when i rotate the tempDC, the aircraft will be rotated automatically, as it is already blitted to the tempDC. i have tried few methods, but the shape is shearing, which is not affordable. I cant roatate the Aircraft.bmp each time, as i load it once on the beginning and then want to rotate it as i receive an angle. can anyone help? I''ll be thankful for help...

推荐答案

这篇关于如何旋转直流的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！