关于多态窗体

[Luck04]

怎样才能让窗口显示某一张图片内容的形状。

[panda_w]

首先定义：
int m_size;
CBitmap m_bitmap;
LPRGNDATA m_rgndata;
BOOL m_ifRgnReady;
LPRGNDATA GetRgnData(CBitmap &bitmap,COLORREF kColor,int *nCount);
void DrawBitmap();

函数实现
LPRGNDATA Cput::GetRgnData(CBitmap &bitmap, COLORREF BkColor, int *nCount)
{
CRgn rgn1,rgn2;
CClientDC dc(this);
CDC memDC;
int x,y,s;
BITMAP bm;
if(bitmap.m_hObject==NULL) return NULL;
bitmap.GetObject(sizeof(BITMAP),&bm);
memDC.CreateCompatibleDC(&dc);
CBitmap *oldBitmap=memDC.SelectObject(&bitmap);
for(y=0;y<bm.bmHeight;y++)
{
x=0;
while(x<bm.bmWidth)
{
while(BkColor==memDC.GetPixel(x,y)&&x<bm.bmWidth) x++;
if(x==bm.bmWidth) break;
s=x;
while(BkColor!=memDC.GetPixel(x,y)&&x<bm.bmWidth) x++;
if(rgn1.m_hObject==NULL) rgn1.CreateRectRgn(s,y,x,y+1);
else {
rgn2.CreateRectRgn(s,y,x,y+1);
rgn1.CombineRgn(&rgn1,&rgn2,RGN_OR);
rgn2.DeleteObject();
}
}
}
memDC.SelectObject(oldBitmap);
LPRGNDATA lpRgnData;
*nCount=rgn1.GetRegionData(NULL,0);
lpRgnData=(LPRGNDATA)new BYTE[*nCount];
rgn1.GetRegionData(lpRgnData,*nCount);
return lpRgnData;
}

void Cput::DrawBitmap()
{
BITMAP bm;
m_bitmap.GetObject(sizeof(BITMAP),&bm);
CClientDC dc(this);
CDC memDC;
memDC.CreateCompatibleDC(&dc);
CBitmap *oldBitmap=memDC.SelectObject(&m_bitmap);
dc.BitBlt(0,0,bm.bmWidth,bm.bmHeight,&memDC,0,0,SRCCOPY);
memDC.SelectObject(oldBitmap);
}
初始化中
CClientDC dc(this);
m_bitmap.LoadBitmap(IDB_SCREEN);
m_ifRgnReady=FALSE;

CBitmap bitmap;
bitmap.LoadBitmap(IDB_SCREEN);
m_rgndata=GetRgnData(bitmap,dc.GetBkColor(),&m_size);


加入WM_PAINT消息
void Cput::OnPaint()
{
CPaintDC dc(this);// device context for painting
DrawBitmap();
if(!m_ifRgnReady){
// CClientDC dc(this);
CRgn rgn;
rgn.CreateFromData(NULL,m_size,m_rgndata);
SetWindowRgn(rgn,TRUE);
m_ifRgnReady=TRUE;
}
// dc.SetBkColor(RGB(0,256,256));
dc.TextOut(22,21,"POLY");
}
其中IDB_SCREEN为要显示的图像，其颜色不要于窗体的颜色一致。

[skt642]

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