c gdiVC 用GDI函数画椭圆和矩形的问题,请高手帮忙

VC 用GDI函数画椭圆和矩形的问题,请高手帮忙

要绘空心的图形 请事先将空刷子选入设备 相关部分改了一下 case WM_MOUSEMOVE: hdc=GetDC(hWnd); SelectObject(hdc, GetStockObject(NULL_BRUSH)); SetROP2(hdc,R2_NOT); if(bDraw==TRUE) { if(drawcontrol==1)//rect { //SetROP2(hdc,R2_XORPEN); MoveToEx(hdc,x1,y1,NULL); Rectangle(hdc,x1,y1,x2,y2); x2=LOWORD(lParam); y2=HIWORD(lParam); MoveToEx(hdc,x1,y1,NULL); Rectangle(hdc,x1,y1,x2,y2); SetROP2(hdc,R2_NOT); } else if(drawcontrol==2)//ellipse { //SetROP2(hdc,R2_XORPEN); MoveToEx(hdc,x1,y1,NULL); Ellipse(hdc,x1,y1,x2,y2); x2=LOWORD(lParam); y2=HIWORD(lParam); MoveToEx(hdc,x1,y1,NULL); Ellipse(hdc,x1,y1,x2,y2); } else if(drawcontrol==3)//freeline { MoveToEx(hdc,x1,y1,NULL); x1=LOWORD(lParam); y1=HIWORD(lParam); LineTo(hdc,x1,y1); ReleaseDC(hWnd,hdc); } else if(drawcontrol==4)//line { MoveToEx(hdc,x1,y1,NULL); LineTo(hdc,x2,y2); x2=LOWORD(lParam); y2=HIWORD(lParam); MoveToEx(hdc,x1,y1,NULL); LineTo(hdc,x2,y2); } // "if ..." end here } ReleaseDC(hWnd,hdc); return 0;