<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1455911219171_14950">Hi List,</div><div id="yui_3_16_0_1_1455911219171_14919"><br></div><div id="yui_3_16_0_1_1455911219171_14951" dir="ltr">Line 593 of pdp_imageproc_portable.c:</div><div id="yui_3_16_0_1_1455911219171_14951" dir="ltr"> /* affine x, y mappings in screen coordinates */</div><div id="yui_3_16_0_1_1455911219171_14951" dir="ltr"> double mapx(double _x, double _y){return cx + izx * ( c * (_x-cx) + s * (_y-cy));}</div><div id="yui_3_16_0_1_1455911219171_14951" dir="ltr"> double mapy(double _x, double _y){return cy + izy * (-s * (_x-cx) + c * (_y-cy));}<br></div><div id="yui_3_16_0_1_1455911219171_14951" dir="ltr"><br></div><div id="yui_3_16_0_1_1455911219171_14951" dir="ltr">These lines are found _inside_ a function called pdp_imageproc_resample_affinemap_process.<br></div><div id="yui_3_16_0_1_1455911219171_14951" dir="ltr"><br></div><div id="yui_3_16_0_1_1455911219171_14951" dir="ltr">It's fun to focus on the substring "portable.c", and just read these lines a few times. :)</div><div id="yui_3_16_0_1_1455911219171_14951" dir="ltr"><br></div><div id="yui_3_16_0_1_1455911219171_14951" dir="ltr">-Jonathan</div></div></body></html>