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[交流] 【求助】改变坐标原点的小程序这么写对吗

最后一个函数注释的是源程序注释下面的语句是我自己改的
坐标原点变了 DRAWBMP语句是这么改吗我改完怎么没有图了啊帮帮我吧
还用改别的吗
void CSolidSim:

rawSolidRound(CDC *pDC, int startx, int starty)
{

CBrush brush;
brush.CreateSolidBrush(RGB(255,0,0));

CBrush * oldBrush = pDC->SelectObject(&brush);

//减去 0.5 是为了画出来的图美观，可以去掉。下面画空心的部分同这个
pDC->Ellipse(startx, starty, startx + DIAMETER-0.5, starty + DIAMETER-0.5);

pDC->SelectObject(oldBrush);

brush.DeleteObject();

void CSolidSim::SaveAsBmp(CString in_name, CString filename)
{
//定义图形大小
int iWidth = 1000;
int iHeight = 1000;
int iPixel = 16;
//图形格式参数
LPBITMAPINFO lpbmih = new BITMAPINFO;
lpbmih->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
lpbmih->bmiHeader.biWidth = iWidth;
lpbmih->bmiHeader.biHeight = iHeight;
lpbmih->bmiHeader.biPlanes = 1;
lpbmih->bmiHeader.biBitCount = iPixel;
lpbmih->bmiHeader.biCompression = BI_RGB;
lpbmih->bmiHeader.biSizeImage = 0;
lpbmih->bmiHeader.biXPelsPerMeter = 0;
lpbmih->bmiHeader.biYPelsPerMeter = 0;
lpbmih->bmiHeader.biClrUsed = 0;
lpbmih->bmiHeader.biClrImportant = 0;

//创建位图数据
HDC hdc,hdcMem;
HBITMAP hBitMap = NULL;
CBitmap *pBitMap = NULL;
CDC *pMemDC = NULL;
BYTE *pBits;

hdc = CreateIC(TEXT("DISPLAY"

,NULL,NULL,NULL);
hdcMem = CreateCompatibleDC(hdc);
hBitMap = CreateDIBSection(hdcMem,lpbmih,DIB_PAL_COLORS,(void **)&pBits,NULL,0);
pBitMap = new CBitmap;
pBitMap->Attach(hBitMap);
pMemDC = new CDC;
pMemDC->Attach(hdcMem);
pMemDC->SelectObject(pBitMap);
   //
CRect rc(0,0,iWidth,iHeight);
pMemDC->SetBkMode(TRANSPARENT);
DrawBmp(pMemDC,rc,in_name);

//保存到文件并创建位图结构
BITMAPFILEHEADER bmfh;
ZeroMemory(&bmfh,sizeof(BITMAPFILEHEADER));
*((char *)&bmfh.bfType) = 'B';
*(((char *)&bmfh.bfType) + 1) = 'M';
bmfh.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
bmfh.bfSize = bmfh.bfOffBits + (iWidth * iHeight) * iPixel / 8;

TCHAR szBMPFileName[128];
int iBMPBytes = iWidth * iHeight * iPixel / 8;
strcpy(szBMPFileName,filename);
CFile file;
if(file.Open(szBMPFileName,CFile::modeWrite | CFile::modeCreate))
{
      file.Write(&bmfh,sizeof(BITMAPFILEHEADER));
      file.Write(&(lpbmih->bmiHeader),sizeof(BITMAPINFOHEADER));
      file.Write(pBits,iBMPBytes);
      file.Close();
}

pMemDC->DeleteDC();
delete pMemDC; pMemDC  = NULL;
delete pBitMap; pBitMap = NULL;
delete lpbmih;  lpbmih  = NULL;
}

void CSolidSim:

rawBmp(CDC *pDC, CRect rcClient, CString in_name)
{
CBrush brushCtl;
brushCtl.CreateSolidBrush(RGB(255,255,255));
pDC->SelectObject(&brushCtl);
    pDC->Rectangle(rcClient);
pDC->FillRect(rcClient,&brushCtl) ;
brushCtl.DeleteObject();

int left = rcClient.left;
//int top  = rcClient.top；
int bottom  = rcClient.bottom;

pDC->MoveTo(left, bottom);

/*for(int x = 0; x<100 ; x++)
{
for(int y = 0; y<0 ; y++ )
{

switch(a[x+y*100])
{
case 2:
DrawBlackRound(pDC, left +y * DIAMETER, top + x * DIAMETER);
break;
case 1:
DrawSolidRound(pDC, left + y * DIAMETER, top + x * DIAMETER);
break;

case 0:
//nothing to do
break;
}
}
}

}*/
改为
for(int y = 0; y<100 ; y++)
{
for(int x = 0; x<0 ; x++ )
{

switch(a[x+y*100])
{
case 2:
DrawBlackRound(pDC, left +x * DIAMETER, bottom - y * DIAMETER);
break;
case 1:
DrawSolidRound(pDC, left + x * DIAMETER, bottom - y * DIAMETER);
break;

case 0:
//nothing to do
break;
}
}
}

}

蓝色为源程序粉色的我自己改的
坐标原点变了 DRAWBMP语句是这么改吗我改完怎么没有图了啊帮帮我吧

[ Last edited by tc1788 on 2009-6-12 at 09:46 ]

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