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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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Task/Bitmap-Midpoint-circle-algorithm/XPL0/bitmap-midpoint-circle-algorithm.xpl0 Normal file
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include c:\cxpl\codes; \include 'code' declarations
proc Circle(X0, Y0, Radius, Color); \Display a circle
int X0, Y0, \coordinates of center
Radius, \radius in (pixels)
Color; \line color
int X, Y, E, U, V;
proc PlotOctants; \Segment
[Point(X0+Y, Y0+X, Color); \ 0
Point(X0+X, Y0+Y, Color); \ 1
Point(X0-X, Y0+Y, Color); \ 2
Point(X0-Y, Y0+X, Color); \ 3
Point(X0-Y, Y0-X, Color); \ 4
Point(X0-X, Y0-Y, Color); \ 5
Point(X0+X, Y0-Y, Color); \ 6
Point(X0+Y, Y0-X, Color); \ 7
]; \PlotOctants
[X:= 0; Y:= Radius;
U:= 1;
V:= 1 -Radius -Radius;
E:= 1 -Radius;
while X < Y do
[PlotOctants;
if E < 0 then
[U:= U+2; V:= V+2; E:= E+U]
else [U:= U+2; V:= V+4; E:= E+V; Y:= Y-1];
X:= X+1;
];
if X = Y then PlotOctants;
]; \Circle
[SetVid($112); \640x480 in 24-bit RGB color
Circle(110, 110, 50, $FFFF00);
if ChIn(1) then []; \wait for keystroke
SetVid(3); \restore normal text mode
]