MinGW >> C/C++ >> Painting
Create Pen
參考資訊:
1. win32
2. tutorial
3. examples_win32
Pen可以想像成是一隻畫筆,粗細、顏色都可以設定,DC(Device Context)可以透過SelectObject()選擇畫筆
main.c
#include <windows.h> HWND hWin = NULL; WNDPROC defWndProc = NULL; LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) { HDC hdc = NULL; HPEN pen = NULL; PAINTSTRUCT ps = {0}; switch (uMsg) { case WM_CLOSE: DestroyWindow(hWnd); return 0; case WM_DESTROY: PostQuitMessage(0); return 0; case WM_PAINT: hdc = BeginPaint(hWnd, &ps); pen = CreatePen(PS_SOLID, 10, RGB(0xff, 0x00, 0x00)); SelectObject(hdc, pen); MoveToEx(hdc, 0, 0, NULL); LineTo(hdc, 100, 100); EndPaint(hWnd, &ps); DeleteObject(pen); break; } return CallWindowProc(defWndProc, hWnd, uMsg, wParam, lParam); } int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { hWin = CreateWindow(WC_DIALOG, "main", WS_OVERLAPPEDWINDOW | WS_VISIBLE, 0, 0, 300, 300, NULL, NULL, NULL, NULL); defWndProc = (WNDPROC)SetWindowLongPtr(hWin, GWLP_WNDPROC, (long int)WndProc); MSG msg = {0}; while (GetMessage(&msg, NULL, 0, 0)) { DispatchMessage(&msg); } ExitProcess(0); return 0; }
Line 21:創造一隻Pen,粗細是10,顏色則是紅色
Line 22:選擇要使用的Pen
Line 23~24:畫一條線
Line 26:刪除資源
編譯、執行
$ i686-w64-mingw32-gcc -mwindows main.c -o main.exe $ wine ./main.exe