Am 07.11.2018 um 20:09 schrieb Andreas Pirklbauer: Wirth's October 1989 ETH technical report No. 117 titled “Drawing Lines, Circles and Ellipses in a Raster” Where could I find this report? Thanks and regards, Dieter -- ____________________________________ Dr. Dieter Glötzel Im Rosengarten 27 64367 Mühltal Tel.: 06151 / 360 82 72