// Draws concentric rings running out from // the center of the image window. // Based on the bullseye.js script distributed // with Kas Thomas' JavaScript Editor plugin at // http://rsb.info.nih.gov/ij/plugins/javascript.html w = 512; h = 512; start = getTime(); xcenter = w/2; ycenter = h/2; newImage("Bulls Eye", "RGB", w, h, 1); for (y=0; y