[Oberon] FPGA - Display3.Mod - porting

[Andreas Pirklbauer]

I recommend that you read Wirth's October 1989 ETH technical report No. 117  titled “Drawing Lines, Circles and Ellipses in a Raster”. In a tutorial style, Bresenham’s algorithms for drawing straight lines and circles are developed using Dijkstra’s notation and discipline.


    > Tomas Kral thomas.kral at email.cz  Wed Nov 7 12:51:46 CET 2018
    >
    > Circle does not use SIN(x) or COS(y) at all, how is that possible? I
    > have always thought we need some trigonometry to draw a circle.