RosettaCodeData/Task/Bitmap-Bresenhams-line-algo.../ALGOL-68/bitmap-bresenhams-line-algo...

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#!/usr/bin/a68g --script #
# -*- coding: utf-8 -*- #
PR READ "prelude/Bitmap.a68" PR;
PR READ "prelude/Bitmap/Bresenhams_line_algorithm.a68" PR;
### The test program: ###
(
REF IMAGE x = INIT LOC[1:16, 1:16]PIXEL;
(fill OF class image)(x, white OF class image);
(line OF class image)(x, ( 1, 8), ( 8,16), black OF class image);
(line OF class image)(x, ( 8,16), (16, 8), black OF class image);
(line OF class image)(x, (16, 8), ( 8, 1), black OF class image);
(line OF class image)(x, ( 8, 1), ( 1, 8), black OF class image);
(print OF class image)(x)
)