如何用位图填充多边形区域

Question

我想使用位图填充一个不规则的多边形区域,怎样做呢?qq"16976440

Answer 1

1.
CDC::FillRgn(CRgn* pRgn, CBrush* pBrush)2.CDC::PlgBlt(LPPOINT lpPoint, CDC* pSrcDC, int xSrc, int ySrc,
int nWidth, int nHeight, CBitmap& maskBitmap, int xMask, int yMask)

Answer 2

CBrush NewBrush,*pOldBrush;
LOGBRUSH lb;
BOOL bResult=0;
CBitmap *pBitmap;
switch(m_pFillStyle)
{
case 0://挖空，不填充
lb.lbStyle=BS_NULL;
lb.lbColor=m_pFillColor;
lb.lbHatch=HS_CROSS;
NewBrush.CreateBrushIndirect(&lb);
break;
case 1://实体填充，颜色
lb.lbStyle=BS_SOLID;
lb.lbColor=m_pFillColor;
lb.lbHatch=HS_CROSS;
NewBrush.CreateBrushIndirect(&lb);
break;
case 2://图形填充
pBitmap=new CBitmap();
bResult=pBitmap->LoadBitmap(IDB_BITMAP1);
NewBrush.CreatePatternBrush(pBitmap);
break;
case 3://斜线填充
lb.lbStyle=BS_HATCHED;
lb.lbHatch=HS_CROSS;
lb.lbColor=m_pFillColor;
NewBrush.CreateBrushIndirect(&lb);
break;
}
pOldBrush=pDC->SelectObject(&NewBrush);   //选择新的画笔画刷
pOldPen=pDC->SelectObject(&NewPen);
pDC->Polygon(m_pPoints,m_pNum);           //画多边形
pDC->SelectObject(pOldPen);               //恢复画笔，画刷
pDC->SelectObject(pOldBrush);
if (bResult!=0)
delete pBitmap;
NewBrush.DeleteObject();

Answer 3

1.生成RGN
HRGN cr;  BeginPath(hDC);
MoveToEx(hDC, 0, 0, NULL);
LineTo(hDC, 64, 0);
LineTo(hDC, 64, 16);
LineTo(hDC, 48, 32);
LineTo(hDC, 0, 32);
LineTo(hDC, 0, 0);
EndPath(hDC);
cr = CreateRectRgn(0, 0, 63, 63);
cr = PathToRegion(hDC);
....
DeleteObject(cr);
生成CBitmap就不用我说了吧

Answer 4

CBrush NewBrush,*pOldBrush;
LOGBRUSH lb;
BOOL bResult=0;
CBitmap *pBitmap;
switch(m_pFillStyle)
{
case 0://挖空，不填充
lb.lbStyle=BS_NULL;
lb.lbColor=m_pFillColor;
lb.lbHatch=HS_CROSS;
NewBrush.CreateBrushIndirect(&lb);
break;
case 1://实体填充，颜色
lb.lbStyle=BS_SOLID;
lb.lbColor=m_pFillColor;
lb.lbHatch=HS_CROSS;
NewBrush.CreateBrushIndirect(&lb);
break;
case 2://图形填充
pBitmap=new CBitmap();
bResult=pBitmap->LoadBitmap(IDB_BITMAP1);
NewBrush.CreatePatternBrush(pBitmap);
break;
case 3://斜线填充
lb.lbStyle=BS_HATCHED;
lb.lbHatch=HS_CROSS;
lb.lbColor=m_pFillColor;
NewBrush.CreateBrushIndirect(&lb);
break;
}
pOldBrush=pDC->SelectObject(&NewBrush);   //选择新的画笔画刷
pOldPen=pDC->SelectObject(&NewPen);
pDC->Polygon(m_pPoints,m_pNum);           //画多边形
pDC->SelectObject(pOldPen);               //恢复画笔，画刷
pDC->SelectObject(pOldBrush);
if (bResult!=0)
delete pBitmap;
NewBrush.DeleteObject();

Answer 5

好人做到底：
CBitmap bmp;
bmp.LoadBitmap(IDB_TEST);
CBrush br;
br.CreatePatternBrush(CBitmap::FromHandle(bmp));
........
::DeleteObject(br);
::DeleteObject(bmp);

Answer 6

int nSaveDC=dc.SaveDC();
1.建立你的区域
2.SelectClipRgn( CRgn* pRgn );
然后就可以画你的位图了，只显示区域内图像的
dc.RestoreDC(nSaveDC);

Answer 7

spwnihao(海盗) 的方法真的好!谢谢海盗!!!!robothn(雷鸟)的也可以,雷鸟兄,你回答我的自画listbox,listview的滚动条的问题,你尝试过吗,我以前尝试过,好象不好用.