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- /*** SOURCE3.C - Creates a .3DV file with the definition of 2 curves
- by Lenimar N. Andrade, ccendm03@brufpb.bitnet
- Dep. of Mathematics - Universidade Federal da ParaĆba - Brazil ***/
-
- #include <stdio.h>
- #include <math.h>
- #include <conio.h>
- #include <stdlib.h>
- #include <time.h>
-
- unsigned nu = 500;
- FILE *arq;
-
- /* Parametric equations of the curves */
- float f1(float t) { return 2*sin(2*t); }
- float f2(float t) { return 2*sin(t)*cos(2*t); }
- float f3(float t) { return 2*cos(t)*cos(2*t); }
-
- float g1(float t) { return 1.5*sin(2*t); }
- float g2(float t) { return 1.5*sin(t)*cos(2*t); }
- float g3(float t) { return 1.5*cos(t)*cos(2*t); }
-
- /* ------------------------------------------------------------------------- */
-
- void CalcPoints2(float umin, float umax) {
-
- float u, incrU;
- unsigned i;
-
- incrU = (umax - umin)/nu;
-
- fprintf(arq, "%u\n", 2*(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));
- for (u = umin; u < umax + incrU/2; u+= incrU)
- fprintf(arq, "%6.3f %6.3f %6.3f\n", g1(u), g2(u), g3(u));
-
- fprintf(arq, "%u\n", 2*(nu + 1));
- for (i = 1; i <= nu + 1; i++) {
- fprintf(arq, "%u %u\n", i, 0);
- fprintf(arq, "%u %u\n", i + nu + 1, 1 + random(15));
- }
- }
-
- /* ------------------------------------------------------------------------- */
-
- void PrintMsg(void) {
-
- fprintf(arq, "\n%s", "Segments linking f(t) = (2*sin(2*t), "
- "2*sin(t)*cos(2*t), 2*cos(t)*cos(2*t))");
- fprintf(arq, "\n%s", " and g(t) = (1.5*sin(2*t),"
- "1.5*sin(t)*cos(2*t),1.5*cos(t)*cos(2*t))");
- fprintf(arq, "\n%s", "Lenimar Nunes de Andrade, ccendm03@brufpb.bitnet\n");
- }
-
- /* ------------------------------------------------------------------------- */
-
- void main(void) {
-
- time_t x;
-
- srand((unsigned) time(&x));
- randomize();
-
- if ((arq = fopen("demo3.3dv", "wt")) == NULL) return;
- CalcPoints2(0, 6.2832);
- PrintMsg();
- fclose(arq);
- }
-
- /* ------------------------------------------------------------------------- */
-
- /*** END OF "SOURCE3.C" ***/