{"id":10543,"date":"2024-03-14T12:19:14","date_gmt":"2024-03-14T12:19:14","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-draw-dynamic-curves-in-mfc\/"},"modified":"2025-08-04T00:55:46","modified_gmt":"2025-08-04T00:55:46","slug":"how-to-draw-dynamic-curves-in-mfc","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-draw-dynamic-curves-in-mfc\/","title":{"rendered":"MFC Dynamic Curves: OnDraw Tutorial"},"content":{"rendered":"

To draw dynamic curves in MFC, you can achieve this by overriding the OnDraw function of the window class. The specific steps are as follows:<\/p>\n

    \n
  1. In the header file of the Window class, define the data structure for the curve that needs to be drawn, for example:<\/li>\n<\/ol>\n
    class<\/span> CMyView<\/span> : public<\/span> CView\r\n{\r\n    \/\/ \u66f2\u7ebf\u6570\u636e\u7ed3\u6784<\/span>\r\n    CArray<CPoint, CPoint> m_points;\r\n};\r\n<\/code><\/pre>\n
      \n
    1. Override the OnDraw function in the implementation file of the window class to draw a curve.<\/li>\n<\/ol>\n
      void<\/span> CMyView::OnDraw<\/span>(CDC* pDC)<\/span>\r\n<\/span>{\r\n    CRect rect;\r\n    GetClientRect<\/span>(&rect);\r\n    \r\n    \/\/ \u521b\u5efa\u753b\u7b14<\/span>\r\n    CPen pen<\/span>(PS_SOLID, 2<\/span>, RGB(0<\/span>, 0<\/span>, 255<\/span>))<\/span><\/span>;\r\n    CPen* pOldPen = pDC->SelectObject<\/span>(&pen);\r\n    \r\n    \/\/ \u7ed8\u5236\u66f2\u7ebf<\/span>\r\n    for<\/span> (int<\/span> i = 1<\/span>; i < m_points.GetSize<\/span>(); i++)\r\n    {\r\n        pDC->MoveTo<\/span>(m_points[i - 1<\/span>]);\r\n        pDC->LineTo<\/span>(m_points[i]);\r\n    }\r\n    \r\n    pDC->SelectObject<\/span>(pOldPen);\r\n}\r\n<\/code><\/pre>\n
        \n
      1. Add a function in the window class to update the curve data, and call this function when the curve needs to be updated.<\/li>\n<\/ol>\n
        void<\/span> CMyView::AddPoint<\/span>(CPoint point)<\/span>\r\n<\/span>{\r\n    m_points.Add<\/span>(point);\r\n    Invalidate<\/span>();\r\n}\r\n<\/code><\/pre>\n
          \n
        1. Call the AddPoint function where you need to draw a curve, and add a new data point.<\/li>\n<\/ol>\n
          void<\/span> CMyView::OnMouseMove<\/span>(UINT nFlags, CPoint point)<\/span>\r\n<\/span>{\r\n    if<\/span> (nFlags & MK_LBUTTON)\r\n    {\r\n        AddPoint<\/span>(point);\r\n    }\r\n}\r\n<\/code><\/pre>\n
          This allows for the dynamic drawing of curves while the mouse moves.<\/p>\n","protected":false},"excerpt":{"rendered":"
          To draw dynamic curves in MFC, you can achieve this by overriding the OnDraw function of the window class. The specific steps are as follows: In the header file of the Window class, define the data structure for the curve that needs to be drawn, for example: class CMyView : public CView { \/\/ \u66f2\u7ebf\u6570\u636e\u7ed3\u6784 […]<\/p>\n","protected":false},"author":11,"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":[7894,13216,13207,8592,13217],"class_list":["post-10543","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-c-graphics","tag-dynamic-curves","tag-mfc-programming","tag-mfc-tutorial","tag-ondraw-function"],"yoast_head":"\nMFC Dynamic Curves: OnDraw Tutorial - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to draw dynamic curves in MFC by overriding the OnDraw function. 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