GDI -PIXELS

最新推荐文章于 2021-06-17 13:20:26 发布

sergery

最新推荐文章于 2021-06-17 13:20:26 发布

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分类专栏： windows

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#include <windows.h>
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
void DrawPixels(HWND hwnd);

int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
    PWSTR lpCmdLine, int nCmdShow)
{
  MSG  msg;
  WNDCLASSW wc = {0};

  wc.style = CS_HREDRAW | CS_VREDRAW;
  wc.lpszClassName = L"Pixels";
  wc.hInstance     = hInstance;
  wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
  wc.lpfnWndProc   = WndProc;
  wc.hCursor       = LoadCursor(0, IDC_ARROW);

  RegisterClassW(&wc);
  CreateWindowW(wc.lpszClassName, L"Pixels",
              WS_OVERLAPPEDWINDOW | WS_VISIBLE,
              100, 100, 250, 150, NULL, NULL, hInstance, NULL);

  while( GetMessage(&msg, NULL, 0, 0)) {
    TranslateMessage(&msg);
    DispatchMessage(&msg);
  }

  return (int) msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg,
    WPARAM wParam, LPARAM lParam)
{
  switch(msg)
  {
    case WM_PAINT:

      DrawPixels(hwnd);
      break;

    case WM_DESTROY:

      PostQuitMessage(0);
      return 0;
  }

  return DefWindowProcW(hwnd, msg, wParam, lParam);
}


void DrawPixels(HWND hwnd)
{
  PAINTSTRUCT ps;
  RECT r;

  HDC hdc = BeginPaint(hwnd, &ps);

  GetClientRect(hwnd, &r);

  for (int i=0; i<1000; i++) 
  {
    int x = (rand() % r.right - r.left);
    int y = (rand() % r.bottom - r.top);	
    SetPixel(hdc, x, y, RGB(255, 0, 0));
  }

  EndPaint(hwnd, &ps);
}