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Ingy döt Net 2013-10-27 23:48:49 +00:00
parent 776bba907c
commit 372c577f83
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46
Task/Bitmap-Midpoint-circle-algorithm/ALGOL-68/bitmap-midpoint-circle-algorithm.alg
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PRAGMAT READ "Basic_bitmap_storage.a68" PRAGMAT;
circle OF class image :=
( REF IMAGE picture,
POINT center,
INT radius,
PIXEL color
)VOID:
BEGIN
INT f := 1 - radius,
POINT ddf := (0, -2 * radius),
df := (0, radius);
picture [x OF center, y OF center + radius] :=
picture [x OF center, y OF center - radius] :=
picture [x OF center + radius, y OF center] :=
picture [x OF center - radius, y OF center] := color;
WHILE x OF df < y OF df DO
IF f >= 0 THEN
y OF df -:= 1;
y OF ddf +:= 2;
f +:= y OF ddf
FI;
x OF df +:= 1;
x OF ddf +:= 2;
f +:= x OF ddf + 1;
picture [x OF center + x OF df, y OF center + y OF df] :=
picture [x OF center - x OF df, y OF center + y OF df] :=
picture [x OF center + x OF df, y OF center - y OF df] :=
picture [x OF center - x OF df, y OF center - y OF df] :=
picture [x OF center + y OF df, y OF center + x OF df] :=
picture [x OF center - y OF df, y OF center + x OF df] :=
picture [x OF center + y OF df, y OF center - x OF df] :=
picture [x OF center - y OF df, y OF center - x OF df] := color
OD
END # circle #;
#
The following illustrates use:
#
IF test THEN
REF IMAGE x = INIT LOC [1:16, 1:16] PIXEL;
(fill OF class image)(x, (white OF class image));
(circle OF class image)(x, (8, 8), 5, (black OF class image));
(print OF class image)(x)
FI