win32 映射模式

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映射模式可以理解为修改坐标轴的方向以及单位。（原点依然在左上角）

/* -------------------------------------------------------------------Author:涵Time:2016年12月30日18:03:39--------------------------------------------------------------------*/#include <windows.h>LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow){static TCHAR szAppName[] = TEXT("MyWindows");HWND hwnd;MSG msg;WNDCLASS wndclass;wndclass.style = CS_HREDRAW | CS_VREDRAW;wndclass.lpfnWndProc = WndProc;wndclass.cbClsExtra = 0;wndclass.cbWndExtra = 0;wndclass.hInstance = hInstance;wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);wndclass.lpszMenuName = NULL;wndclass.lpszClassName = szAppName;if (!RegisterClass(&wndclass)){MessageBox(NULL, TEXT("这个程序需要在 Windows NT 才能执行！"), szAppName, MB_ICONERROR);return 0;}hwnd = CreateWindow(szAppName,TEXT("映射模式-涵涵"),WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,NULL,NULL,hInstance,NULL);ShowWindow(hwnd, iCmdShow);UpdateWindow(hwnd);while (GetMessage(&msg, NULL, 0, 0)){TranslateMessage(&msg);DispatchMessage(&msg);}return msg.wParam;}LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam){HDC hdc;PAINTSTRUCT ps;RECT rect;int iMapMode;switch (message){case WM_PAINT:hdc = BeginPaint(hwnd, &ps);//获取当前映射模式iMapMode = GetMapMode(hdc);//输出字体TextOut(hdc, 100, 100, TEXT("MM_TEXT"), 7);//SetMapMode(hdc, MM_LOMETRIC);TextOut(hdc, 100, -100, TEXT("MM_LOMETRIC"), 11);//恢复回去SetMapMode(hdc, iMapMode);EndPaint(hwnd, &ps);return 0;case WM_DESTROY:PostQuitMessage(0);return 0;}return DefWindowProc(hwnd, message, wParam, lParam);}

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