Draw a sphere: Difference between revisions
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[[image:Tcl-spheroid.gif]]
=={{header|XPL0}}==
[[File:SphereXPL0.png|right]]
<lang XPL0>include c:\cxpl\codes; \intrinsic 'code' declarations
def R=100, R2=R*R; \radius, in pixels; radius squared
def X0=640/2, Y0=480/2; \coordinates of center of screen
int X, Y, Z, C, D2; \coords, color, distance from center squared
[SetVid($112); \set 640x480x24 graphics mode
for Y:= -R to +R do \for all the coordinates near the circle
for X:= -R to +R do \ which is under the sphere
[D2:= X*X + Y*Y;
C:= 0; \default color is black
if D2 <= R2 then \coordinate is inside circle under sphere
[Z:= sqrt(R2-D2); \height of point on surface of sphere above X,Y
C:= Z-(X+Y)/2+130; \color is proportional; offset X and Y, and
]; \ shift color to upper limit of its range
Point(X+X0, Y+Y0, C<<8+C); \green + blue = cyan
];
repeat until KeyHit; \wait for keystroke
SetVid($03); \restore normal text mode
]</lang>
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