I did it ................

#include <windows.h> #include<math.h> #define COUNT 1000 #define SAVE_AS 101 #define COLOR 201 #define RESET 301 #define ABOUT 401 HINSTANCE hInst; LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); void czCreateMenu(HWND); void Save_As(HWND); int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) { static LPCWSTR szAppName = L"Graphics"; HWND hwnd; MSG msg; WNDCLASSEX wndclass; wndclass.cbSize = sizeof(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; wndclass.hIconSm = LoadIcon(NULL, IDI_APPLICATION); RegisterClassEx(&wndclass); hwnd = CreateWindow(szAppName, L"Graphics", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL); ShowWindow(hwnd, iCmdShow); UpdateWindow(hwnd); SetTimer(hwnd, 1, USER_TIMER_MINIMUM, NULL); czCreateMenu(hwnd); hInst = hInstance; while (GetMessage(&msg, NULL, 0, 0)) { TranslateMessage(&msg); DispatchMessage(&msg); } return msg.wParam; } LRESULT CALLBACK WndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam) { int wmId; static int cxClient, cyClient, Phase = 0; HDC hdc; PAINTSTRUCT ps; CHOOSECOLOR cc; static HPEN hPen; static COLORREF color = RGB(0, 0, 0), acrCustClr[16]; unsigned i = 0; const static int multiple = 100; static POINT pt[COUNT * multiple] = { 0 }; static bool Move = true; switch (iMsg) { case WM_CREATE: for (double x = 0; x < COUNT; x += 0.05) { double y = 0; pt[i].x = (LONG)(x / 5 * multiple); double a = abs(sin(3 * x)); pt[i++].y = (LONG)(a * multiple); } break; case WM_COMMAND: wmId = LOWORD(wParam); switch (wmId) { case SAVE_AS: Save_As(hwnd); break; case COLOR: cc.lStructSize = sizeof(CHOOSECOLOR); cc.hwndOwner = hwnd; cc.lpCustColors = (LPDWORD)acrCustClr; cc.rgbResult = color; cc.Flags = CC_FULLOPEN | CC_RGBINIT; ChooseColor(&cc); color = cc.rgbResult; InvalidateRect(hwnd, NULL, true); break; case RESET: Phase = 0; break; case ABOUT: MessageBox(hwnd, L"GraphicDrawer v.1.0\n© Pashkevich EA, 2016", L"About", MB_OK | MB_ICONWARNING); break; } break; case WM_SIZE: cxClient = LOWORD(lParam); cyClient = HIWORD(lParam); break; case WM_PAINT: hdc = BeginPaint(hwnd, &ps); hPen = CreatePen(0, 1, color); SelectObject(hdc, hPen); MoveToEx(hdc, pt[0].x, cyClient / 2 - pt[0].y, 0); for (unsigned j = Phase; j < cxClient + Phase; j++) LineTo(hdc, pt[j].x - Phase, cyClient / 2 - pt[j].y); EndPaint(hwnd, &ps); break; case WM_LBUTTONDOWN: case WM_RBUTTONDOWN: Move = !Move; break; case WM_TIMER: if (Move){ Phase++; InvalidateRect(hwnd, NULL, true); } break; case WM_DESTROY: PostQuitMessage(0); break; } return DefWindowProc(hwnd, iMsg, wParam, lParam); } void czCreateMenu(HWND hwnd) { HMENU MainMenu = CreateMenu(); HMENU mFile = CreatePopupMenu(); HMENU mView = CreatePopupMenu(); AppendMenu(MainMenu, MF_STRING | MF_POPUP, (UINT)mFile, L"&File"); { AppendMenu(mFile, MF_STRING, SAVE_AS, L"Save as..."); } AppendMenu(MainMenu, MF_STRING | MF_POPUP, (UINT)mView, L"&View"); { AppendMenu(mView, MF_STRING, COLOR, L"Color"); } AppendMenu(MainMenu, MF_STRING, RESET, L"Reset"); AppendMenu(MainMenu, MF_STRING, ABOUT, L"About"); SetMenu(hwnd, MainMenu); } void Save_As(HWND hwnd) { OPENFILENAME SaveDialog; HANDLE SaveFile; DWORD Written; HDC hdcMem, hdcWindow; HBITMAP hBitmap; BYTE *ArrOfImg; RECT rt; int width = 0, height = 0; ZeroMemory(&SaveDialog, sizeof(OPENFILENAME)); SaveDialog.lStructSize = sizeof(OPENFILENAME); SaveDialog.hInstance = hInst; SaveDialog.Flags = OFN_OVERWRITEPROMPT; SaveDialog.lpstrFilter = L"*.bmp\0*.bmp\0\0"; SaveDialog.lpstrFile = new TCHAR[100]; SaveDialog.nMaxFile = _MAX_PATH; memset(SaveDialog.lpstrFile, 0, 100); GetSaveFileName(&SaveDialog); if (!SaveDialog.lpstrFile[0]) return; SaveFile = CreateFile(SaveDialog.lpstrFile, GENERIC_WRITE, FILE_SHARE_WRITE, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); hdcWindow = GetDC(hwnd); hdcMem = CreateCompatibleDC(hdcWindow); GetClientRect(hwnd, &rt); hBitmap = CreateCompatibleBitmap(hdcWindow, width = rt.right - rt.left, height = rt.bottom - rt.top); SelectObject(hdcMem, hBitmap); BitBlt(hdcMem, 0, 0, width, height, hdcWindow, 0, 0, SRCCOPY); BITMAPINFO bmi; memset(bmi.bmiColors, 0, sizeof(bmi.bmiColors)); bmi.bmiHeader.biBitCount = 24; bmi.bmiHeader.biClrImportant = 0; bmi.bmiHeader.biClrUsed = 0; bmi.bmiHeader.biCompression = 0; bmi.bmiHeader.biHeight = height; bmi.bmiHeader.biWidth = width; bmi.bmiHeader.biSizeImage = (width * 3 + width % 4) * height; bmi.bmiHeader.biSize = 40; bmi.bmiHeader.biPlanes = 1; bmi.bmiHeader.biXPelsPerMeter = 0; bmi.bmiHeader.biYPelsPerMeter = 0; BITMAPFILEHEADER bmfh; bmfh.bfType = MAKEWORD('B', 'M'); bmfh.bfOffBits = sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER); bmfh.bfSize = bmfh.bfOffBits + bmi.bmiHeader.biSizeImage; bmfh.bfReserved1 = 0; bmfh.bfReserved2 = 0; WriteFile(SaveFile, &bmfh, sizeof(BITMAPFILEHEADER), &Written, 0); WriteFile(SaveFile, &bmi.bmiHeader, sizeof(BITMAPINFOHEADER), &Written, 0); ArrOfImg = new BYTE[bmi.bmiHeader.biSizeImage]; GetDIBits(hdcMem, hBitmap, 0, bmi.bmiHeader.biHeight, ArrOfImg, &bmi, DIB_RGB_COLORS); WriteFile(SaveFile, ArrOfImg, bmi.bmiHeader.biSizeImage, &Written, 0); CloseHandle(SaveFile); delete[] ArrOfImg; }
  • four
    What is the problem? That does not work? Give an example of your code, specify a specific question. While it seems to work for the author. - Zufir
  • With tz WinAPI, the code is good enough. But the construction of the graph itself (in WM_CREATE) is lame. It is not entirely clear why there are some coefficients. The feeling that you just fiddled with the formula of crutches. Can I even see a screenshot? The question itself, based on the WinAPI code level, is also confusing. Is this your code? - mega

1 answer 1

You can use GDI Plus, so-so approach, but time-tested:

  Graphics graphics(hdc); Pen pen(Color(255, 0, 0, 255)); graphics.DrawLine(&pen, 0, 0, 200, 100);

An example from Microsoft (I think it’s not worth bringing all the code here).

  • one
    Lines can be drawn with ordinary GDI. For this, it is not necessary to connect GDI + - mega
  • LineTo from GDI - nick_n_a