{"id":11138,"date":"2024-03-14T13:30:06","date_gmt":"2024-03-14T13:30:06","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-draw-a-triangle-using-mfc-in-c\/"},"modified":"2025-08-04T08:04:06","modified_gmt":"2025-08-04T08:04:06","slug":"how-to-draw-a-triangle-using-mfc-in-c","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-draw-a-triangle-using-mfc-in-c\/","title":{"rendered":"MFC Triangle Drawing in C++ Guide"},"content":{"rendered":"<p>When drawing a triangle using MFC, you can achieve this by overriding the OnPaint function of the CWnd class. The specific steps are as follows:<\/p>\n<p>Firstly, create an MFC application and add a derived class from CWnd within it.<\/p>\n<p>Add the following code to the header file of the CWnd class.<\/p>\n<pre class=\"post-pre\"><code class=\"lang-cpp\">class CTriangleWnd : public CWnd\r\n{\r\npublic:\r\n    CTriangleWnd();\r\n    virtual ~CTriangleWnd();\r\n\r\nprotected:\r\n    DECLARE_MESSAGE_MAP()\r\n    afx_msg void OnPaint();\r\n};\r\n<\/code><\/pre>\n<p>3. Add the following code to the implementation file of the CWnd class:<\/p>\n<pre class=\"post-pre\"><code class=\"lang-cpp\">BEGIN_MESSAGE_MAP(CTriangleWnd, CWnd)\r\n    ON_WM_PAINT()\r\nEND_MESSAGE_MAP()\r\n\r\nCTriangleWnd::CTriangleWnd()\r\n{\r\n}\r\n\r\nCTriangleWnd::~CTriangleWnd()\r\n{\r\n}\r\n\r\nvoid CTriangleWnd::OnPaint()\r\n{\r\n    CPaintDC dc(this);\r\n\r\n    \/\/ \u7ed8\u5236\u4e09\u89d2\u5f62\r\n    POINT points[3];\r\n    points[0] = { 100, 100 };\r\n    points[1] = { 150, 200 };\r\n    points[2] = { 50, 200 };\r\n\r\n    dc.Polygon(points, 3);\r\n}\r\n<\/code><\/pre>\n<p>Create an instance of CTriangleWnd in the main window class and then display it.<\/p>\n<pre class=\"post-pre\"><code class=\"lang-cpp\">BOOL CMyApp::InitInstance()\r\n{\r\n    \/\/ \u521b\u5efa\u4e3b\u7a97\u53e3\r\n    CMainFrame* pFrame = new CMainFrame;\r\n    m_pMainWnd = pFrame;\r\n\r\n    \/\/ \u521b\u5efa\u4e09\u89d2\u5f62\u7a97\u53e3\r\n    CTriangleWnd* pTriangleWnd = new CTriangleWnd;\r\n    pTriangleWnd-&gt;Create(NULL, _T(\"Triangle Window\"), WS_VISIBLE | WS_OVERLAPPEDWINDOW, CRect(0, 0, 300, 300), pFrame);\r\n\r\n    \/\/ \u663e\u793a\u4e3b\u7a97\u53e3\r\n    pFrame-&gt;ShowWindow(SW_SHOW);\r\n    pFrame-&gt;UpdateWindow();\r\n\r\n    return TRUE;\r\n}\r\n<\/code><\/pre>\n<p>By following the above steps, you can use the CWnd class in MFC application to draw a simple triangle.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>When drawing a triangle using MFC, you can achieve this by overriding the OnPaint function of the CWnd class. The specific steps are as follows: Firstly, create an MFC application and add a derived class from CWnd within it. Add the following code to the header file of the CWnd class. class CTriangleWnd : public [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[7894,14222,8592,14223,9861],"class_list":["post-11138","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-c-graphics","tag-mfc-triangle","tag-mfc-tutorial","tag-triangle-drawing","tag-windows-programming"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>MFC Triangle Drawing in C++ Guide - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Step-by-step guide to drawing triangles with MFC in C++. 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