自己通过坐标转化，实现的一个按钮。绘图绘制的

// PaintTest.cpp : 定义应用程序的入口点。
//

#include "stdafx.h"
#include "PaintTest.h"

#define MAX_LOADSTRING 100

// 全局变量:
HINSTANCE hInst;								// 当前实例
TCHAR szTitle[MAX_LOADSTRING];					// 标题栏文本
TCHAR szWindowClass[MAX_LOADSTRING];			// 主窗口类名

// 此代码模块中包含的函数的前向声明:
ATOM				MyRegisterClass(HINSTANCE hInstance);
BOOL				InitInstance(HINSTANCE, int);
LRESULT CALLBACK	WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK	About(HWND, UINT, WPARAM, LPARAM);

int APIENTRY _tWinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPTSTR    lpCmdLine,
                     int       nCmdShow)
{
	UNREFERENCED_PARAMETER(hPrevInstance);
	UNREFERENCED_PARAMETER(lpCmdLine);

 	// TODO: 在此放置代码。
	MSG msg;
	HACCEL hAccelTable;

	// 初始化全局字符串
	LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
	LoadString(hInstance, IDC_PAINTTEST, szWindowClass, MAX_LOADSTRING);
	MyRegisterClass(hInstance);

	// 执行应用程序初始化:
	if (!InitInstance (hInstance, nCmdShow))
	{
		return FALSE;
	}

	hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_PAINTTEST));

	// 主消息循环:
	while (GetMessage(&msg, NULL, 0, 0))
	{
		if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
		{
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
	}

	return (int) msg.wParam;
}



//
//  函数: MyRegisterClass()
//
//  目的: 注册窗口类。
//
//  注释:
//
//    仅当希望
//    此代码与添加到 Windows 95 中的“RegisterClassEx”
//    函数之前的 Win32 系统兼容时，才需要此函数及其用法。调用此函数十分重要，
//    这样应用程序就可以获得关联的
//    “格式正确的”小图标。
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
	WNDCLASSEX wcex;

	wcex.cbSize = sizeof(WNDCLASSEX);

	wcex.style			= CS_HREDRAW | CS_VREDRAW;
	wcex.lpfnWndProc	= WndProc;
	wcex.cbClsExtra		= 0;
	wcex.cbWndExtra		= 0;
	wcex.hInstance		= hInstance;
	wcex.hIcon			= LoadIcon(hInstance, MAKEINTRESOURCE(IDI_PAINTTEST));
	wcex.hCursor		= LoadCursor(NULL, IDC_ARROW);
	wcex.hbrBackground	= (HBRUSH)(COLOR_WINDOW+1);
	wcex.lpszMenuName	= MAKEINTRESOURCE(IDC_PAINTTEST);
	wcex.lpszClassName	= szWindowClass;
	wcex.hIconSm		= LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));

	return RegisterClassEx(&wcex);
}

//
//   函数: InitInstance(HINSTANCE, int)
//
//   目的: 保存实例句柄并创建主窗口
//
//   注释:
//
//        在此函数中，我们在全局变量中保存实例句柄并
//        创建和显示主程序窗口。
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   HWND hWnd;

   hInst = hInstance; // 将实例句柄存储在全局变量中

   hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

   if (!hWnd)
   {
      return FALSE;
   }

   ShowWindow(hWnd, nCmdShow);
   UpdateWindow(hWnd);

   return TRUE;
}

//
//  函数: WndProc(HWND, UINT, WPARAM, LPARAM)
//
//  目的: 处理主窗口的消息。
//
//  WM_COMMAND	- 处理应用程序菜单
//  WM_PAINT	- 绘制主窗口
//  WM_DESTROY	- 发送退出消息并返回
//
//
#include
using namespace std;
#define  WINDOW_CX  800
#define  WINDOW_CY  600
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	int wmId, wmEvent;
	PAINTSTRUCT ps;
	HDC hdc;
    char debugString[100];
    static HBITMAP hCloseBit;
    static int cxClient, cyClient, cxWindow, cyWindow,cxBord, cyBord;
    static BITMAP bitMapClose;
    static HDC hdcClose =NULL;
    static HDC hdcTemp;
    static BOOL isMouseOver = FALSE;
	static RECT closeRect;
    BOOL isInRect = FALSE;
    POINT movePos;
    switch (message)
	{
    case WM_MOUSEMOVE:
        //这里是设备逻辑坐标，不是窗口的。映射对其没有影响。
        movePos.x = LOWORD(lParam);
        movePos.y = HIWORD(lParam);
        //转化设备坐标为窗口坐标,注意大转小，还是小转大。还注意double，
        movePos.x = (movePos.x - 0)*((double)WINDOW_CX /cxClient ) + 0; //大转化小
        movePos.y = (movePos.y - 0)*((double)WINDOW_CY /cyClient) + 0;
        //
        isMouseOver = PtInRect(&closeRect,movePos);
        //将刷新区域的坐标转化为窗口逻辑坐标，将无效区域变小
        closeRect.right   = 50 *((double)cxClient /WINDOW_CX);
        closeRect.bottom  = 25 *((double)cyClient /WINDOW_CY);
        sprintf(debugString,"right is % d  bottom is %d \n",closeRect.right,closeRect.bottom);
        OutputDebugStringA(debugString);
        InvalidateRect(hWnd,&closeRect,TRUE);

        break;

    case WM_CREATE:
        hCloseBit = LoadBitmap(GetModuleHandle(NULL),MAKEINTRESOURCE(IDB_BITMAP1));
        if(hCloseBit==NULL)
            OutputDebugStringA("load error\n");
        hdcTemp = GetDC(hWnd);
        hdcClose = CreateCompatibleDC(hdcTemp);
        SelectObject(hdcClose,hCloseBit);
        GetObject(hCloseBit,sizeof(BITMAP),&bitMapClose);
        SetRect(&closeRect,0,0,50,25);
        ReleaseDC(hWnd,hdcTemp);
        break;
    case WM_LBUTTONDOWN:
        movePos.x = LOWORD(lParam);
        movePos.y = HIWORD(lParam);
        //转化设备坐标为窗口坐标,注意大转小，还是小转大。还注意double，
        movePos.x = (movePos.x - 0)*((double)WINDOW_CX /cxClient ) + 0; //大转化小
        movePos.y = (movePos.y - 0)*((double)WINDOW_CY /cyClient) + 0;
        //
        isMouseOver = PtInRect(&closeRect,movePos);
        SendMessage(hWnd,WM_CLOSE,NULL,NULL);
    case WM_SIZE:
        cxClient = LOWORD(lParam);
        cyClient = HIWORD(lParam);
        cxWindow = GetSystemMetrics(SM_CXMAXIMIZED);
        cyWindow = GetSystemMetrics(SM_CYMAXIMIZED);
        cxBord = GetSystemMetrics(SM_CXSIZEFRAME);
        cyBord = GetSystemMetrics(SM_CYSIZEFRAME);
        sprintf(debugString,"cxClinet is % d  cyClinet is %d \n",cxClient,cyClient);
        OutputDebugStringA(debugString);
        sprintf(debugString,"cxWindow is % d  cyWindow is %d \n",cxWindow,cyWindow);
        OutputDebugStringA(debugString);
        sprintf(debugString,"cxBord is % d  cyBord is %d \n",cxBord,cyBord);
        OutputDebugStringA(debugString);
        //===============================map===============================//
        /*
        hdcTemp = GetDC(hWnd);
        SetMapMode(hdcTemp,MM_ANISOTROPIC);
        SetWindowExtEx(hdcTemp,800,600,NULL);
        SetViewportExtEx(hdcTemp,cxClient,cyClient,NULL);
        SetViewportExtEx(hdcTemp,0,0,NULL);
        /
       ReleaseDC(hWnd,hdcTemp);
       */

        break;
	case WM_COMMAND:
		wmId    = LOWORD(wParam);
		wmEvent = HIWORD(wParam);
		// 分析菜单选择:
		switch (wmId)
		{
		case IDM_ABOUT:
			DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
			break;
		case IDM_EXIT:
			DestroyWindow(hWnd);
			break;
		default:
			return DefWindowProc(hWnd, message, wParam, lParam);
		}
		break;
	case WM_PAINT:
		hdc = BeginPaint(hWnd, &ps);
        ///map
        SetMapMode(hdc,MM_ANISOTROPIC);
        SetWindowExtEx(hdc,WINDOW_CX ,WINDOW_CY,NULL);
        SetViewportExtEx(hdc,cxClient,cyClient,NULL);
        SetViewportExtEx(hdc,0,0,NULL);
	    // TODO: 在此添加任意绘图代码...
        sprintf(debugString,"left is % d  top is %d  right is %d  bottom is %d\n",ps.rcPaint.left,ps.rcPaint.top,ps.rcPaint.right,ps.rcPaint.bottom);
        OutputDebugStringA(debugString);
        if(isMouseOver)
        {
           StretchBlt(hdc,0,0,50,25,hdcClose,0,0,bitMapClose.bmWidth,bitMapClose.bmHeight,NOTSRCCOPY);
        }
        else
        {
           StretchBlt(hdc,0,0,50,25,hdcClose,0,0,bitMapClose.bmWidth,bitMapClose.bmHeight,SRCCOPY);
        }
        
		EndPaint(hWnd, &ps);
		break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	default:
		return DefWindowProc(hWnd, message, wParam, lParam);
	}
	return 0;
}

// “关于”框的消息处理程序。
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
	UNREFERENCED_PARAMETER(lParam);
	switch (message)
	{
	case WM_INITDIALOG:
		return (INT_PTR)TRUE;

	case WM_COMMAND:
		if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
		{
			EndDialog(hDlg, LOWORD(wParam));
			return (INT_PTR)TRUE;
		}
		break;
	}
	return (INT_PTR)FALSE;
}