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#ifndef lint |
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static const char RCSid[] = "$Id: genblinds.c,v 2.14 2020/06/30 18:16:30 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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|
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#include "rtio.h" |
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#include <stdlib.h> |
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#include <math.h> |
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|
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#ifndef PI |
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#define PI 3.14159265358979323846 |
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#endif |
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#define DELTA 3. /* MINIMAL SUSTAINED ANGLE IN DEGREES */ |
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|
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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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|
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|
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static void makeflat(double w, double d, double a); |
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static void printslat(int n); |
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|
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void |
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makeflat( |
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double w, |
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double d, |
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double a |
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) |
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{ |
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double h; |
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|
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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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} |
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|
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|
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void |
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printslat( /* print slat # n */ |
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int n |
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) |
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{ |
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int i, k; |
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|
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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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|
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|
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int |
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main( |
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int argc, |
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char *argv[] |
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) |
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{ |
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double width, delem, depth, rcurv = 0.0, mydelta, angle; |
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double beta, gamma, theta, chi = 0; |
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int i, j, k, l; |
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|
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|
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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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} |
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/* CURVED BLIND CALCULATION */ |
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|
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if (rcurv != 0.) { |
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|
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/* BLINDS SUSTAINED ANGLE */ |
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|
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theta = 2.*asin(depth/(2.*fabs(rcurv))); |
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|
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/* HOW MANY ELEMENTARY SURFACES SHOULD BE CALCULATED ? */ |
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|
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nsurf = (int)(theta / ((PI/180.)*DELTA) + 0.99999); |
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|
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mydelta = (180./PI) * theta / nsurf; |
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|
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/* WHAT IS THE DEPTH OF THE ELEMENTARY SURFACES ? */ |
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|
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delem = 2.*fabs(rcurv)*sin((PI/180.)*(mydelta/2.)); |
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|
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beta = (PI-theta)/2.; |
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gamma = beta -((PI/180.)*angle); |
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|
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|
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|
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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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|
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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.-mydelta)/2.) - (gamma+(k*(PI/180.)*mydelta)); |
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} |
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if (rcurv > 0) { |
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chi=(PI-(gamma+theta)+(k*(PI/180.)*mydelta))-(PI/180.)* |
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((180.-mydelta)/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.)*mydelta))-A[0]; |
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X[1]=0.; |
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X[2]=fabs(rcurv)*sin(gamma+(k*(PI/180.)*mydelta))-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.)*mydelta))-A[0]; |
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X[1]=0.; |
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X[2]=(-fabs(rcurv))*sin(gamma+theta-(k*(PI/180.)*mydelta))-A[2]; |
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} |
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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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|
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/* FLAT BLINDS CALCULATION */ |
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|
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else { |
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|
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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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|
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fputs("# ", stdout); |
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printargs(argc, argv, stdout); |
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|
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|
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/* REPEAT THE BASIC CURVED OR FLAT SLAT TO GET THE OVERALL BLIND */ |
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|
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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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|
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|
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|
