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  1. #1
    Join Date
    Jun 1999

    Radius and Centre of Circle

    I am drawing a circle using ellipse because there is no explicit command for this.
    	pDC->Ellipse(CRect(70, 170, 300, 400));
    Kindly tell me what is the centre of circle and what is radius in the above command?


  2. #2
    2kaud's Avatar
    2kaud is offline Super Moderator Power Poster
    Join Date
    Dec 2012

    Re: Radius and Centre of Circle

    The length of the radius is half the size of one of the sides of the square. The given CRect is a square of length 230 so the radius of the circle is 115.

    The centre of the circle is the centre of the bounding CRect which is (70 + 115, 170 + 115) or (185, 285).
    All advice is offered in good faith only. All my code is tested (unless stated explicitly otherwise) with the latest version of Microsoft Visual Studio (using the supported features of the latest standard) and is offered as examples only - not as production quality. I cannot offer advice regarding any other c/c++ compiler/IDE or incompatibilities with VS. You are ultimately responsible for the effects of your programs and the integrity of the machines they run on. Anything I post, code snippets, advice, etc is licensed as Public Domain https://creativecommons.org/publicdomain/zero/1.0/ and can be used without reference or acknowledgement. Also note that I only provide advice and guidance via the forums - and not via private messages!

    C++17 Compiler: Microsoft VS2017 (15.7.2)

  3. #3
    Join Date
    Jun 1999

    Re: Radius and Centre of Circle

    Thanks for your useful guidance.


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