Editing t4setr - FilterMeisterWiki

When saving, enter the following:

 TT  TT   #######    ##    ______  #    #  
 TT  TT   #   ##    ####   |  ___| ##   #  
  TTTT       ##    ##  ##  | |_    # #  #  
   TT       ##     ##  ##  |  _|   #  # #  
  TTTT     ##      ######  | |     #   ##  
 TT  TT   ##    #  ##  ##  \_|     #    #  
 TT  TT   #######  ##  ##          #    #

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= t4setr =
''Requires FM 1.0 Beta 8.5 (Nov 2007) or newer''

== Syntax ==
:{{void t4setr(int d, int m, int z, int v)}}
== Arguments ==
:'''d'''
::An integer direction from the origin in the fourth tile buffer.
:'''m'''
::An integer magnitude from the origin in the fourth tile 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.
== Return ==
:None
== Description ==
:This function sets the value of one channel for a pixel in the fourth tile 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)
		{
			t4setr(d, m, z, 256); // create white circles
		}
	}
}

return true;

}
</code>
== See Also ==
:((pgetr)), ((tsetr)), ((tgetr)), ((t4getr))
== Comments ==
:Everyone can add his comments about his experiences with this function here. Tips for using it are welcome, too.

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