Bresenham's 反走样算法.rar

#include<windows.h> #include<math.h> LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) { static TCHAR szAppName[] = TEXT ("LINE") ; HWND hwnd ; MSG msg ; WNDCLASS wndclass ; memset(&wndclass, 0, sizeof(WNDCLASS));//clear the 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) (COLOR_WINDOW + 1) ; wndclass.lpszMenuName = NULL; wndclass.lpszClassName = szAppName ; if (!RegisterClass (&wndclass)) { MessageBox (NULL, TEXT ("This program requires Windows NT!"), szAppName, MB_ICONERROR) ; return 0 ; } hwnd = CreateWindow (szAppName, TEXT ("Line example"), 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 ; } void Line(HDC hdc,int lxB,int lyB,int lxE,int lyE, COLORREF cr) { int x, y, dx, dy, e1, m, w; x = lxB; y = lyB; dx = lxE - lxB; dy = lyE - lyB; m = dy / dx; w = 1 - m; e1 = 1 / 2; SetPixel(hdc, x, y, cr); while (x < lxE) { if (e1 < w) { x = x + 1; e1 = e1 + m; } else { x = x + 1; y = y + 1; e1 = e1 - w; } SetPixel(hdc, x, y, cr); } } LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { PAINTSTRUCT ps; HDC hdc; switch(message) { case WM_CREATE: InvalidateRect(hwnd, NULL, TRUE); return 0; case WM_PAINT: hdc = BeginPaint(hwnd, &ps); //line drawing Line(hdc, 50, 50, 500, 50, RGB(255, 0, 255)); Line(hdc, 70, 70, 400, 400, RGB(0, 255, 0)); Line(hdc, 100, 400, 500, 700, RGB(0, 255, 0)); EndPaint(hwnd, &ps); return 0; case WM_DESTROY: PostQuitMessage(0); return 0; } return DefWindowProc(hwnd, message, wParam, lParam); }