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#include <math.h>
#include <stdio.h>
#include "tek.h"
parabola(x0, y0, x1, y1, xb, yb) 
double	x0, y0, x1, y1, xb, yb; 
{
	register double x, y, t;
	double	c0x, c0y, c1x, c1y;
	double	dt, d2, d1;
	d1 = sqrt((xb - x0) * (xb - x0) + (yb - y0) * (yb - y0));
	d2 = sqrt((xb - x1) * (xb - x1) + (yb - y1) * (yb - y1));
	if (d1 <= e1->quantum || d2 <= e1->quantum) { 
		line(x0, y0, x1, y1); 
		return(0); 
	}
	c0x = x0 + x1 - 2. * xb; 
	c1x = 2. * (xb - x0);
	c0y = y0 + y1 - 2. * yb; 
	c1y = 2. * (yb - y0);
	move(x0, y0);
	dt = e1->quantum / d1;
	if(e1->grade != 0.)
		dt /= e1->grade;
	for (t = dt; t < 0.5; t += dt) {
		x = (c0x * t + c1x) * t + x0;
		y = (c0y * t + c1y) * t + y0;
		vec(x, y);
	}
	dt = e1->quantum / d2;
	if(e1->grade != 0.)
		dt /= e1->grade;
	for (; t < 1.0; t += dt) {
		x = (c0x * t + c1x) * t + x0;
		y = (c0y * t + c1y) * t + y0;
		vec(x, y);
	}
	vec(x1, y1);
}

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