Editing psetr - FilterMeisterWiki

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= psetr =

== Syntax ==
{{void psetr(int d, int m, int z, int v)}}

== Arguments ==
:'''d'''
::An integer direction from the origin in the output buffer.
:'''m'''
::An integer magnitude from the origin in the output buffer.
:'''z'''
::An integer channel number in the range 0 to 3.
:'''v'''
::An integer value to be set for channel 'z', in the range 0 to 255.

== Description ==
This function sets the value of one channel for a pixel in the output buffer, using polar coordinates (rather than cartesian) to address the pixel; the polar coordinates are relative to the image center. The channel to be set is given by 'z' (0 = red, 1 = green, 2 = blue, and 3 = alpha). NOTE: There is no guarantee that this function is able to completely populate the plane - some pixels in the output buffer may be unreachable because of rounding errors.

== Example ==
<code>
%ffp

ForEveryTile: {

int d, m;

for (d=0; d<1024; ++d) {
    for (m=0; m<256; m+=3) {
      for (z=0; z<Z; ++z) {
        psetr(d, m, z, 256);
      }
    }
  }

return true;
}
</code>

== See Also ==
((tsetr)), ((t2setr)), ((pgetr))

== Comments ==
Everyone can add his comments about his experiences with this function here. Tips for using it are welcome, too.

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