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SOURCE4.C
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1996-02-29
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/*** SOURCE4.C - Creates a .3DV file with the definition of a curve
by Lenimar N. Andrade, ccendm03@brufpb.bitnet
Dep. of Mathematics - Universidade Federal da Paraíba - Brazil ***/
#include <stdio.h>
#include <math.h>
#include <conio.h>
unsigned nu = 300;
FILE *arq;
/* Parametric equations of the curve */
float f1(float t) { return t/10; }
float f2(float t) { return t/10*sin(t); }
float f3(float t) { return t/10*cos(t); }
/* ------------------------------------------------------------------------- */
void CalcPoints2(float umin, float umax) {
float u, incrU;
unsigned i;
incrU = (umax - umin)/nu;
fprintf(arq, "%u\n", (nu + 1));
for (u = umin; u < umax + incrU/2; u+= incrU)
fprintf(arq, "%6.3f %6.3f %6.3f\n", f1(u), f2(u), f3(u));
fprintf(arq, "%u\n", nu + 1);
for (i = 1; i <= nu + 1; i++)
if (i == 1)
fprintf(arq, "%u %u\n", i, 0);
else
fprintf(arq, "%u %u\n", i, YELLOW);
}
/* ------------------------------------------------------------------------- */
void PrintMsg(void) {
fprintf(arq, "\n%s", "3D curve f(t) = (t/10, t/10*sin(t), t/10*cos(t))");
fprintf(arq, "\n%s", "Lenimar Nunes de Andrade, ccendm03@brufpb.bitnet\n");
}
/* ------------------------------------------------------------------------- */
void main(void) {
if ((arq = fopen("demo4.3dv", "wt")) == NULL) return;
CalcPoints2(-30, 30);
PrintMsg();
fclose(arq);
}
/* ------------------------------------------------------------------------- */
/*** END OF "SOURCE4.C" ***/