/*簡單的使用dc畫筆畫出直線，矩形，橢圓*/
#include<Windows.h>
#include<tchar.h>
//聲明窗口函數(shù)
LRESULT CALLBACK WindowProc (
       HWND hwnd,
       UINT uMsg,
       WPARAM wParam,
       LPARAM lParam
       );
//入口函數(shù)WinMain
int WINAPI WinMain(
     HINSTANCE hInstance,
     HINSTANCE hPrevInstance,
     LPSTR lpCmdLine,
     int nCmdShow
     )
{
 //定義窗口類
 WNDCLASS wndclass;
 wndclass.lpfnWndProc=WindowProc;//指定窗口函數(shù)
 wndclass.cbClsExtra=0;
 wndclass.cbWndExtra=0;
 wndclass.style=CS_HREDRAW|CS_VREDRAW;
 wndclass.lpszClassName=_T("我的窗體");
 wndclass.hInstance=hInstance;
 wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);//獲取標(biāo)準(zhǔn)鼠標(biāo)光標(biāo)
 wndclass.hIcon=0;
 wndclass.hbrBackground=(HBRUSH)(COLOR_WINDOW+1);
 wndclass.lpszMenuName=0;
 //注冊(cè)窗口類
 if(RegisterClass(&wndclass)==0)
 {
  MessageBox(0,_T("注冊(cè)窗口類失敗"),_T("我的窗體"),MB_OK);
  return 0;
 }
 //創(chuàng)建窗體實(shí)列
 HWND hWnd = CreateWindow(_T("我的窗體"),_T("窗體繪圖"),WS_OVERLAPPEDWINDOW,100,100,500,400,0,0,hInstance,0);
 //顯示和更新窗體
 ShowWindow(hWnd,SW_SHOW);
 UpdateWindow(hWnd);
 //消息循環(huán)
 MSG msg;
  while(GetMessage(&msg,0,0,0))
  {
   TranslateMessage(&msg);
   DispatchMessage(&msg);
   }
  return 0;
}
//定義窗口函數(shù)
LRESULT CALLBACK WindowProc (
       HWND hwnd,
       UINT uMsg,
       WPARAM wParam,
       LPARAM lParam
       )
{
 switch(uMsg)
 {
 case WM_PAINT://響應(yīng)繪圖消息
  {
   PAINTSTRUCT ps;
   //獲得DC
   HDC hDC = BeginPaint(hwnd,&ps);
   //創(chuàng)建實(shí)線，寬度為1，紅色的筆
   HPEN hPen=CreatePen(PS_SOLID,1,RGB(255,0,0));
   //將筆選入DC
   HPEN hOldPen=(HPEN)SelectObject(hDC,hPen);
   //繪制紅色的直線
   MoveToEx(hDC,10,10,NULL);
   LineTo(hDC,90,50);
   //創(chuàng)建一個(gè)藍(lán)色的刷子
   HBRUSH hBrush = CreateSolidBrush(RGB(0,0,255));
   HBRUSH hOldBrush= (HBRUSH)SelectObject(hDC,hBrush);
   //繪制矩形，因?yàn)楣P沒有換，所以繪制的是紅色邊框，藍(lán)色區(qū)域的矩形
   Rectangle(hDC,100,100,200,170);
   //繪制橢圓，因?yàn)楣P和刷子都沒換，所以繪制的是紅色的邊框，藍(lán)色區(qū)域的橢圓
   Ellipse(hDC,200,230,260,300);
   //輸出文字
   TextOut(hDC,200,30,_T("繪圖測試"),4);
   //恢復(fù)繪圖對(duì)象
   SelectObject(hDC,hOldPen);
   SelectObject(hDC,hOldBrush);
   //刪除繪圖對(duì)象
   DeleteObject(hPen);
   DeleteObject(hBrush);
   //釋放DC
   EndPaint(hwnd,&ps);

  }
  break;
 case WM_CLOSE:
  PostQuitMessage(0);
  break;
 default:
  return DefWindowProc(hwnd,uMsg,wParam,lParam);
  }
 return 0;
}