dev-cpp-users

[Dev-C++] Thanks but I found the answer

[Brian W. <nig...@ho...>]

<html><div style='background-color:'><DIV class=RTE>If anyone is wondering how to draw a circle pixel by pixel, use x=(Radius)*cos(Number increasing from 0-6.26 by small incraments) + xpos of center of circle, y=(radius)*sin(Number increasing from 0-6.26 by small incraments) + ypos</DIV>
<DIV class=RTE>Put that inside a loop where t increases by something like .01 and draw the point inside the loop also.</DIV></div><br clear=all><hr> <a href="http://g.msn.com/8HMAENUS/2755??PS=">Click here for a FREE online computer virus scan from McAfee.</a> </html>

Re: [Dev-C++] Thanks but I found the answer

[w. y. <yok...@ve...>]

Brian Wallace wrote:
> 
> If anyone is wondering how to draw a circle pixel by pixel, use x=(Radius)*cos(Number increasing from 0-6.26 by small incraments) + xpos of center of circle, y=(radius)*sin(Number increasing from 0-6.26 by small incraments) + ypos
> Put that inside a loop where t increases by something like .01 and draw the point inside the loop also.

You can use larger increments and just connect the points by lines.
Bigger circles need smaller increments to look round though. However,
sin and cos are time consuming functions. Try searching for
"circle algorithm" in google.

Re: [Dev-C++] Thanks but I found the answer

[Per W. <pw...@ia...>]

Check out the Graphics Gems series of books. The sources from them are
available for download from a number of places.

Yes, it is possible to draw a circle using the cos and sin functions.
However, this is not a recommended method since they are expensive
functions. There are a number of methods where the algorithm only process
90 or 45 degrees - depending on support for elipses or non-unity aspect
ratio - and where next pixel is found in an iterative loop through a DDA -
digital differential analysis - evaluation, i.e. given a specific pixel,
the algorithm just evaluates if next pixel should be one step right or one
step up.

/Per W

On Mon, 9 Feb 2004, Brian Wallace wrote:

> If anyone is wondering how to draw a circle pixel by pixel, use x=(Radius)*cos(Number increasing from 0-6.26 by small incraments) + xpos of center of circle,
> y=(radius)*sin(Number increasing from 0-6.26 by small incraments) + ypos
> Put that inside a loop where t increases by something like .01 and draw the point inside the loop also.
>
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