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#ifndef lint
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static const char RCSid[] = "$Id: genblinds.c,v 2.9 2003/02/22 02:07:23 greg Exp $";
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#endif
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/*
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* genblind2.c - make some curved or flat venetian blinds.
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*
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* Jean-Louis Scartezzini and Greg Ward
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*
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* parameters:
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* depth - depth of blinds
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* width - width of slats
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* height - height of blinds
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* nslats - number of slats
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* angle - blind incidence angle ( in degrees )
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* rcurv - curvature radius of slats (up:>0;down:<0;flat:=0)
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include <string.h>
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#define PI 3.14159265358979323846
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#define DELTA 10. /* MINIMAL SUSTAINED ANGLE IN DEGREES */
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double baseflat[4][3], baseblind[4][3][180];
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double A[3],X[3];
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char *material, *name;
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double height;
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int nslats, nsurf;
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makeflat(w,d,a)
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double w, d, a;
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{
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double h;
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h = d*sin(a);
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d *= cos(a);
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baseflat[0][0] = 0.0;
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baseflat[0][1] = 0.0;
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baseflat[0][2] = 0.0;
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baseflat[1][0] = 0.0;
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baseflat[1][1] = w;
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baseflat[1][2] = 0.0;
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baseflat[2][0] = d;
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baseflat[2][1] = w;
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baseflat[2][2] = h;
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baseflat[3][0] = d;
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baseflat[3][1] = 0.0;
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baseflat[3][2] = h;
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}
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printslat(n) /* print slat # n */
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int n;
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{
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register int i, k;
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for (k=0; k < nsurf; k++) {
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printf("\n%s polygon %s.%d.%d\n", material, name, n, k);
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printf("0\n0\n12\n");
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for (i = 0; i < 4; i++)
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printf("\t%18.12g\t%18.12g\t%18.12g\n",
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baseblind[i][0][k],
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baseblind[i][1][k],
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baseblind[i][2][k] + height*(n-.5)/nslats);
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}
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}
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printhead(ac, av) /* print command header */
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register int ac;
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register char **av;
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{
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putchar('#');
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while (ac--) {
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putchar(' ');
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fputs(*av++, stdout);
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}
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putchar('\n');
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}
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main(argc, argv)
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int argc;
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char *argv[];
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{
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double width, delem, depth, rcurv = 0.0, angle;
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double beta, gamma, theta, chi;
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int i, j, k, l;
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if (argc != 8 && argc != 10)
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goto userr;
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material = argv[1];
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name = argv[2];
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depth = atof(argv[3]);
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width = atof(argv[4]);
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height = atof(argv[5]);
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nslats = atoi(argv[6]);
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angle = atof(argv[7]);
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if (argc == 10)
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if (!strcmp(argv[8], "-r"))
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rcurv = atof(argv[9]);
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else if (!strcmp(argv[8], "+r"))
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rcurv = -atof(argv[9]);
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else
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goto userr;
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/* CURVED BLIND CALCULATION */
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if (rcurv != 0) {
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/* BLINDS SUSTAINED ANGLE */
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theta = 2*asin(depth/(2*fabs(rcurv)));
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/* HOW MANY ELEMENTARY SURFACES SHOULD BE CALCULATED ? */
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nsurf = (int)(theta / ((PI/180.)*DELTA)) + 1;
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/* WHAT IS THE DEPTH OF THE ELEMENTARY SURFACES ? */
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delem = 2*fabs(rcurv)*sin((PI/180.)*(DELTA/2.));
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beta = (PI-theta)/2.;
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gamma = beta -((PI/180.)*angle);
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if (rcurv < 0) {
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A[0]=fabs(rcurv)*cos(gamma);
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A[0] *= -1;
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A[1]=0.;
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A[2]=fabs(rcurv)*sin(gamma);
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}
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if (rcurv > 0) {
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A[0]=fabs(rcurv)*cos(gamma+theta);
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A[1]=0.;
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A[2]=fabs(rcurv)*sin(gamma+theta);
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A[2] *= -1;
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}
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for (k=0; k < nsurf; k++) {
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if (rcurv < 0) {
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chi=(PI/180.)*((180.-DELTA)/2.) - (gamma+(k*(PI/180.)*DELTA));
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}
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if (rcurv > 0) {
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chi=(PI-(gamma+theta)+(k*(PI/180.)*DELTA))-(PI/180.)*
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((180.-DELTA)/2.);
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}
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makeflat(width, delem, chi);
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if (rcurv < 0.) {
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X[0]=(-fabs(rcurv))*cos(gamma+(k*(PI/180.)*DELTA))-A[0];
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X[1]=0.;
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X[2]=fabs(rcurv)*sin(gamma+(k*(PI/180.)*DELTA))-A[2];
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}
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if (rcurv > 0.) {
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X[0]=fabs(rcurv)*cos(gamma+theta-(k*(PI/180.)*DELTA))-A[0];
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X[1]=0.;
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X[2]=(-fabs(rcurv))*sin(gamma+theta-(k*(PI/180.)*DELTA))-A[2];
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}
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for (i=0; i < 4; i++) {
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for (j=0; j < 3; j++) {
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baseblind[i][j][k] = baseflat[i][j]+X[j];
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}
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}
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}
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}
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/* FLAT BLINDS CALCULATION */
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if (rcurv == 0.) {
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nsurf=1;
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makeflat(width,depth,angle*(PI/180.));
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for (i=0; i < 4; i++) {
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for (j=0; j < 3; j++) {
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baseblind[i][j][0] = baseflat[i][j];
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}
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}
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}
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printhead(argc, argv);
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/* REPEAT THE BASIC CURVED OR FLAT SLAT TO GET THE OVERALL BLIND */
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for (l = 1; l <= nslats; l++)
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printslat(l);
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exit(0);
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userr:
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fprintf(stderr,
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"Usage: %s mat name depth width height nslats angle [-r|+r rcurv]\n",
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argv[0]);
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exit(1);
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}
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