= t2setr =
== Syntax == :void t2setr(int d, int m, int z, int v) == Arguments == :d ::An integer direction from the origin in the second tile buffer. :m ::An integer magnitude from the origin in the second 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 second 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) { t2setr(d, m, z, 0); // create black circles } } }return true; }</code> == Also see == == Comments == :Everyone can add his comments about his experiences with this function here. Tips for using it are welcome, too. |