2 * Displays a conformation
16 typedef struct { double vertex[3][D3]; } Triangle;
18 static Triangle trisbuffer[MAXTRIS], *displaylist[MAXTRIS];
20 static Vertices conformation;
22 static double transform[D3][D3]= {{1,0,0}, {0,1,0}, {0,0,1}};
23 static GSL_MATRIX(transform);
26 static struct stat input_stab;
27 static const char *input_filename;
29 static void read_input(void) {
32 if (input_f) fclose(input_f);
33 input_f= fopen(input_filename, "rb"); if (!input_f) diee("input file");
35 if (fstat(fileno(input_f), &input_stab)) diee("fstat input file");
38 r= fread(&conformation,sizeof(conformation),1,input_f);
39 if (r!=1) diee("fread");
42 static void transform_coordinates(void) {
45 gsl_vector input_gsl= { D3,1 };
50 input_gsl.data= &conformation[v][0];
51 GA( gsl_blas_dgemv(CblasNoTrans, 1.0,&transform_gsl, &input_gsl,
53 K conformation[v][k]= result[k];
57 static void addtriangle(int va, int vb, int vc) {
58 Triangle *t= &trisbuffer[ntris];
61 assert(ntris < MAXTRIS);
63 t->vertex[0][k]= conformation[va][k];
64 t->vertex[1][k]= conformation[vb][k];
65 t->vertex[2][k]= conformation[vc][k];
67 displaylist[ntris++]= t;
70 static void generate_display_list(void) {
75 /* We use the two triangles in the parallelogram vb, vb+e0, vb+e1, vb+e2.
76 * We go round each triangle clockwise (although our surface is non-
77 * orientable so it shouldn't matter).
79 for (e=0; e<3; e++) ve[e]= EDGE_END2(vb,e);
81 if (ve[0]>=0) addtriangle(vb,ve[0],ve[1]);
82 if (ve[2]>=0) addtriangle(vb,ve[1],ve[2]);
87 static int dl_compare(const void *tav, const void *tbv) {
89 const Triangle *const *tap= tav, *ta= *tap;
90 const Triangle *const *tbp= tbp, *tb= *tbp;
93 za += ta->vertex[i][2];
94 zb += tb->vertex[i][2];
100 static void sort_display_list(void) {
101 qsort(displaylist, ntris, sizeof(*displaylist), dl_compare);
104 /*---------- X stuff ----------*/
108 typedef struct { GC fillgc, linegc; } DrawingMode;
110 static Display *display;
111 static Pixmap pixmap, doublebuffers[2];
112 static Window window;
114 static DrawingMode dmred, dmblue, dmwhite;
115 static const DrawingMode *dmcurrent;
116 static int wwidth=WSZ, wheight=WSZ, wmindim=WSZ, wmaxdim=WSZ;
117 static int ncut, currentbuffer, x11depth, x11screen;
120 static double sizeadj_scale= 0.3, eyes_apart, scale_wmindim;
121 static double eye_z= -10, eye_x=0;
122 static double cut_z= -9;
124 static void drawtriangle(const Triangle *t) {
128 for (i=0; i<3; i++) {
129 double *v= t->vertex[i];
134 if (z < cut_z) { ncut++; return; }
136 double zezezp= eye_z / (eye_z - z);
137 points[i].x= scale_wmindim * (zezezp * (x - eye_x) + eye_x) + wwidth/2;
138 points[i].y= scale_wmindim * (zezezp * y ) + wheight/2;
140 points[3]= points[0];
142 XA( XFillPolygon(display,pixmap, dmcurrent->fillgc,
143 points,3,Convex,CoordModeOrigin) );
144 XA( XDrawLines(display,pixmap, dmcurrent->linegc,
145 points, 4,CoordModeOrigin) );
148 static const unsigned long core_event_mask=
149 ButtonPressMask|ButtonReleaseMask|StructureNotifyMask|ButtonMotionMask;
151 static void mkpixmaps(void) {
152 for (currentbuffer=0; currentbuffer<2; currentbuffer++) {
153 XA( pixmap= XCreatePixmap(display,window,wwidth,wheight,x11depth) );
154 doublebuffers[currentbuffer]= pixmap;
159 static void mkgcs(DrawingMode *dm, unsigned long planes) {
162 gcv.function= GXcopy;
163 gcv.foreground= WhitePixel(display,x11screen);
164 gcv.plane_mask= planes;
165 dm->linegc= XCreateGC(display,pixmap,
166 GCFunction|GCForeground|GCPlaneMask,
169 gcv.function= GXclear;
170 dm->fillgc= XCreateGC(display,pixmap,
171 GCFunction|GCPlaneMask,
175 static void display_prepare(void) {
176 XSetWindowAttributes wa;
179 XA( display= XOpenDisplay(0) );
180 x11screen= DefaultScreen(display);
181 x11depth= DefaultDepth(display,x11screen);
182 XA( XMatchVisualInfo(display,x11screen,x11depth, TrueColor,&visinfo) );
184 wa.event_mask= core_event_mask;
185 XA( window= XCreateWindow(display, DefaultRootWindow(display),
186 0,0, wwidth,wheight, 0,x11depth,
187 InputOutput, visinfo.visual,
190 hints.flags= USPosition;
193 XSetWMNormalHints(display,window,&hints);
197 mkgcs(&dmwhite, AllPlanes);
198 mkgcs(&dmblue, visinfo.blue_mask);
199 mkgcs(&dmred, visinfo.red_mask);
202 static void drawtriangles(const DrawingMode *dm) {
207 for (i=0, t=displaylist, ncut=0; i<ntris; i++, t++)
211 static void display_conformation(void) {
212 pixmap= doublebuffers[currentbuffer];
214 XA( XFillRectangle(display,pixmap,dmwhite.fillgc,0,0,wwidth,wheight) );
216 if (eyes_apart > 0) {
217 const double preferred=0.05, beyond=0.07;
219 eye_x= eyes_apart < preferred ? eyes_apart :
220 eyes_apart < beyond ? preferred :
221 eyes_apart - (beyond - preferred);
222 eye_x /= sizeadj_scale;
223 drawtriangles(&dmblue);
225 drawtriangles(&dmred);
227 drawtriangles(&dmwhite);
228 printf("shown, %d/%d triangles cut\n", ncut, ntris);
231 XA( XSetWindowBackgroundPixmap(display,window,pixmap) );
232 XA( XClearWindow(display,window) );
233 currentbuffer= !currentbuffer;
236 static void show(void) {
237 scale_wmindim= sizeadj_scale * wmindim;
239 transform_coordinates();
240 generate_display_list();
242 display_conformation();
248 void (*delta)(double dx, double dy);
249 void (*conclude)(void);
250 void (*abandon)(void);
254 static const Drag drag_##x= { \
255 #x, drag_##x##_start, drag_##x##_delta, \
256 drag_##x##_conclude, drag_##x##_abandon \
259 #define DRAG_SAVING(x, thing) \
260 static typeof(thing) original_##thing; \
261 static void drag_##x##_start(void) { \
262 memcpy(&original_##thing, &thing, sizeof(thing)); \
264 static void drag_##x##_conclude(void) { } \
265 static void drag_##x##_abandon(void) { \
266 memcpy(&thing, &original_##thing, sizeof(thing)); \
271 static void drag_none_start(void) { }
272 static void drag_none_delta(double dx, double dy) { }
273 static void drag_none_conclude(void) { }
274 static void drag_none_abandon(void) { }
277 static void pvectorcore(const char *n, double v[D3]) {
280 K printf("%# 10.10f ",v[k]);
283 static void pvector(const char *n, double v[D3]) {
287 static void pmatrix(const char *n, double m[D3][D3]) {
289 for (j=0; j<D3; j++) { pvectorcore(n,m[j]); n=""; }
292 #define PMATRIX(x) pmatrix(#x,x);
294 static void drag_rotate_delta(double dx, double dy) {
295 /* We multiple our transformation matrix by a matrix:
297 * If we just had y movement, we would rotate about x axis:
298 * rotation X = [ 1 0 0 ]
301 * where cy and sy are sin and cos of y rotation
303 * But we should pre-rotate this by a rotation about the z axis
304 * to get it to the right angle (to include x rotation). So
305 * we make cy and sy be cos() and sin(hypot(x,y)) and use
306 * with cr,sr as cos() and sin(atan2(y,y)):
308 * Ie we would do T' = R^T X R T where
309 * or T' = C T where C = R^T X R and
311 * adjustment R = [ cr sr 0 ]
316 double rotx[D3][D3], adjr[D3][D3];
320 static double temp[D3][D3], change[D3][D3];
321 static GSL_MATRIX(temp);
322 static GSL_MATRIX(change);
324 double d= hypot(dx,dy);
325 if (d < 1e-6) return;
333 printf("\n d=%g cy,sy=%g,%g cr,sr=%g,%g\n\n", d,cy,sy,cr,sr);
335 rotx[0][0]= 1; rotx[0][1]= 0; rotx[0][2]= 0;
336 rotx[1][0]= 0; rotx[1][1]= cy; rotx[1][2]= sy;
337 rotx[2][0]= 0; rotx[2][1]= -sy; rotx[2][2]= cy;
340 adjr[0][0]= cr; adjr[0][1]= sr; adjr[0][2]= 0;
341 adjr[1][0]= -sr; adjr[1][1]= cr; adjr[1][2]= 0;
342 adjr[2][0]= 0; adjr[2][1]= 0; adjr[2][2]= 1;
345 GA( gsl_blas_dgemm(CblasNoTrans,CblasNoTrans, 1.0,
350 GA( gsl_blas_dgemm(CblasTrans,CblasNoTrans, 1.0,
355 static double skew[D3][D3];
356 static GSL_MATRIX(skew);
358 GA( gsl_blas_dgemm(CblasNoTrans,CblasNoTrans, 1.0,
359 &change_gsl,&transform_gsl,
363 memcpy(&transform,&skew,sizeof(transform));
367 /* Now we want to normalise skew, the result becomes new transform */
368 double svd_v[D3][D3];
371 double sigma[D3], tau[D3];
375 /* We use notation from Wikipedia Polar_decomposition
376 * Wikipedia's W is GSL's U
377 * Wikipedia's Sigma is GSL's S
378 * Wikipedia's V is GSL's V
379 * Wikipedia's U is our desired result
380 * Wikipedia which says if the SVD is A = W Sigma V*
381 * then the polar decomposition is A = U P
382 * where P = V Sigma V*
386 GA( gsl_linalg_SV_decomp(&skew_gsl, &svd_v_gsl, &sigma_gsl, &tau_gsl) );
388 pvector("Sigma",sigma);
391 /* We only need U, not P. */
392 GA( gsl_blas_dgemm(CblasNoTrans,CblasTrans, 1.0,
393 &skew_gsl,&svd_v_gsl,
394 0.0,&transform_gsl) );
396 pmatrix("U", transform);
398 printf("drag_rotate_delta...\n");
401 DRAG_SAVING(rotate, transform);
403 static void drag_sizeadj_delta(double dx, double dy) {
404 sizeadj_scale *= pow(3.0, -dy);
407 DRAG_SAVING(sizeadj, sizeadj_scale);
409 static void drag_3d_delta(double dx, double dy) {
410 const double min_eyes_apart= -0.02;
411 eyes_apart += dx * 0.1;
412 if (eyes_apart < min_eyes_apart) eyes_apart= min_eyes_apart;
413 printf("sizeadj eyes_apart %g\n", eyes_apart);
416 DRAG_SAVING(3d, eyes_apart);
418 static const Drag *drag= &drag_none;
420 static int drag_last_x, drag_last_y;
422 static void drag_position(int x, int y) {
423 drag->delta((x - drag_last_x) * 1.0 / wmaxdim,
424 (y - drag_last_y) * 1.0 / wmaxdim);
429 static void event_button(XButtonEvent *e) {
430 if (e->window != window || !e->same_screen) return;
431 if (e->type == ButtonPress) {
432 if (e->state || drag != &drag_none) {
433 printf("drag=%s press state=0x%lx abandon\n",
434 drag->name, (unsigned long)e->state);
440 case Button1: drag= &drag_rotate; break;
441 case Button2: drag= &drag_sizeadj; break;
442 case Button3: drag= &drag_3d; break;
443 default: printf("unknown drag start %d\n", e->button);
445 printf("drag=%s press button=%lu start %d,%d\n",
446 drag->name, (unsigned long)e->button, e->x, e->y);
451 if (e->type == ButtonRelease) {
452 printf("drag=%s release %d,%d\n", drag->name, e->x, e->y);
453 drag_position(e->x, e->y);
459 static void event_motion(int x, int y) {
460 printf("drag=%s motion %d,%d\n", drag->name, x, y);
464 static void event_config(XConfigureEvent *e) {
465 if (e->width == wwidth && e->height == wheight)
468 wwidth= e->width; wheight= e->height;
469 wmaxdim= wwidth > wheight ? wwidth : wheight;
470 wmindim= wwidth < wheight ? wwidth : wheight;
472 XA( XSetWindowBackground(display,window,BlackPixel(display,x11screen)) );
473 for (currentbuffer=0; currentbuffer<2; currentbuffer++)
474 XA( XFreePixmap(display, doublebuffers[currentbuffer]) );
480 static void check_input(void) {
484 r= stat(input_filename, &newstab);
485 if (r<0) diee("could not check input");
487 #define CI(x) if (newstab.st_##x == input_stab.st_##x) ; else goto changed
499 int main(int argc, const char *const *argv) {
500 static const int wantedevents= POLLIN|POLLPRI|POLLERR|POLLHUP;
503 int k, i, r, *xfds, nxfds, polls_alloc=0;
504 struct pollfd *polls=0;
505 int motion_deferred=0, motion_x=-1, motion_y=-1;
507 if (argc != 2 || argv[1][0]=='-') {
508 fputs("need filename\n",stderr); exit(8);
510 input_filename= argv[1];
513 K transform[k][k]= 1.0;
517 XMapWindow(display,window);
520 XA( XInternalConnectionNumbers(display, &xfds, &nxfds) );
521 if (polls_alloc <= nxfds) {
522 polls_alloc= nxfds + polls_alloc + 1;
523 polls= realloc(polls, sizeof(*polls) * polls_alloc);
524 if (!polls) diee("realloc for pollfds");
526 for (i=0; i<nxfds; i++) {
527 polls[i].fd= xfds[i];
528 polls[i].events= wantedevents;
533 polls[i].fd= ConnectionNumber(display);
534 polls[i].events= wantedevents;
536 r= poll(polls, nxfds+1, motion_deferred ? 0 : 200);
537 if (r<0) diee("poll");
539 for (i=0; i<nxfds; i++)
540 if (polls[i].revents)
541 XProcessInternalConnection(display, polls[i].fd);
543 r= XCheckMaskEvent(display,~0UL,&event);
545 if (motion_deferred) {
546 event_motion(motion_x, motion_y);
553 switch (event.type) {
556 case ButtonRelease: event_button(&event.xbutton); break;
558 case ConfigureNotify: event_config(&event.xconfigure); break;
561 motion_x= event.xmotion.x;
562 motion_y= event.xmotion.y;
567 printf("unknown event type %u 0x%x\n", event.type,event.type);