46 lines
917 B
C++
46 lines
917 B
C++
/****************************************************************
|
|
*
|
|
* Spiral
|
|
*
|
|
* A simple graphics demo. Uses the shell STOP command from the
|
|
* debug menu to stop the program early.
|
|
*
|
|
* by Mike Westerfield
|
|
*
|
|
* Copyright 1989
|
|
* Byte Works, Inc.
|
|
*
|
|
****************************************************************/
|
|
|
|
#pragma keep "Spiral"
|
|
#pragma lint -1
|
|
|
|
#include <quickdraw.h>
|
|
#include <math.h>
|
|
|
|
int main (void)
|
|
|
|
{
|
|
float r, theta, rot;
|
|
int color = 1;
|
|
Rect rect;
|
|
|
|
GetPortRect(&rect);
|
|
SetPenSize(3, 1);
|
|
for (rot = 0.0002; rot < 0.0005; rot += 0.0001) {
|
|
theta = 0.0;
|
|
r = 40.0;
|
|
MoveTo ((int) (cos (theta) * r * 3) + 160,
|
|
(int) (sin (theta) * r) + 40);
|
|
while (r > 0.0) {
|
|
SetSolidPenPat (color);
|
|
color ^= 3;
|
|
theta += 3.1415926535 / 21.0 + rot;
|
|
LineTo ((int) (cos (theta) * r * 3) + 160,
|
|
(int) (sin (theta) * r) + 40);
|
|
r -= 0.02;
|
|
}
|
|
}
|
|
Out: ;
|
|
}
|