图形界面 时钟表盘

代码：

//POINT的数组可以这么用POINT pt[]={0, 450,225,390,390,225,450,0,390,-225,225,-390,0,-450,-225,-390,-390,-225,-450,0,-390,225,-225,390};

SetIsotropic函数：设置坐标系

//改变坐标系就用这四个函数void SetIsotropic(HDC hdc, int cx, int cy){::SetMapMode(hdc, MM_ISOTROPIC); //设置坐标映射方式::SetWindowExtEx(hdc, 1000, 1000, NULL); //设置坐标系的逻辑单位::SetViewportExtEx(hdc, cx, -cy, NULL); //设置坐标系方向和坐标系包含的范围，即定义域和值域::SetViewportOrgEx(hdc, cx/2, cy/2, NULL); //设置坐标系原点坐标}

case WM_PAINT:hdc = BeginPaint(hWnd, &ps);// TODO: 在此添加任意绘图代码...//画钟表盘int cxClient, cyClient;RECT rect;::GetClientRect(hWnd, &rect);cxClient = rect.right - rect.left;cyClient = rect.bottom - rect.top;SetIsotropic(hdc, cxClient, cyClient);#define  SQUARESIZE 10::SelectObject(hdc, ::GetStockObject(BLACK_BRUSH));for(int i=0;i<12;i++){::Ellipse(hdc, pt[i].x-SQUARESIZE,pt[i].y+SQUARESIZE,pt[i].x+SQUARESIZE, pt[i].y-SQUARESIZE); }EndPaint(hWnd, &ps);break;