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, wireframe;
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;
123 static const double eyes_apart_preferred=0.05, eyes_apart_min= -0.02;
126 static void drawtriangle(const Triangle *t) {
130 for (i=0; i<3; i++) {
131 double *v= t->vertex[i];
136 if (z < cut_z) { ncut++; return; }
138 double zezezp= eye_z / (eye_z - z);
139 points[i].x= scale_wmindim * (zezezp * (x - eye_x) + eye_x) + wwidth/2;
140 points[i].y= scale_wmindim * (zezezp * y ) + wheight/2;
142 points[3]= points[0];
145 XA( XFillPolygon(display,pixmap, dmcurrent->fillgc,
146 points,3,Convex,CoordModeOrigin) );
147 XA( XDrawLines(display,pixmap, dmcurrent->linegc,
148 points, 4,CoordModeOrigin) );
151 static const unsigned long core_event_mask=
152 ButtonPressMask|ButtonReleaseMask|StructureNotifyMask|ButtonMotionMask|
155 static void mkpixmaps(void) {
156 for (currentbuffer=0; currentbuffer<2; currentbuffer++) {
157 XA( pixmap= XCreatePixmap(display,window,wwidth,wheight,x11depth) );
158 doublebuffers[currentbuffer]= pixmap;
163 static void mkgcs(DrawingMode *dm, unsigned long planes) {
166 gcv.function= GXcopy;
167 gcv.foreground= WhitePixel(display,x11screen);
168 gcv.plane_mask= planes;
169 dm->linegc= XCreateGC(display,pixmap,
170 GCFunction|GCForeground|GCPlaneMask,
173 gcv.function= GXclear;
174 dm->fillgc= XCreateGC(display,pixmap,
175 GCFunction|GCPlaneMask,
179 static void display_prepare(void) {
180 XSetWindowAttributes wa;
183 XA( display= XOpenDisplay(0) );
184 x11screen= DefaultScreen(display);
185 x11depth= DefaultDepth(display,x11screen);
186 XA( XMatchVisualInfo(display,x11screen,x11depth, TrueColor,&visinfo) );
188 wa.event_mask= core_event_mask;
189 XA( window= XCreateWindow(display, DefaultRootWindow(display),
190 0,0, wwidth,wheight, 0,x11depth,
191 InputOutput, visinfo.visual,
194 hints.flags= USPosition;
197 XSetWMNormalHints(display,window,&hints);
201 mkgcs(&dmwhite, AllPlanes);
202 mkgcs(&dmblue, visinfo.blue_mask);
203 mkgcs(&dmred, visinfo.red_mask);
206 static void drawtriangles(const DrawingMode *dm) {
211 for (i=0, t=displaylist, ncut=0; i<ntris; i++, t++)
215 static void display_conformation(void) {
216 pixmap= doublebuffers[currentbuffer];
218 XA( XFillRectangle(display,pixmap,dmwhite.fillgc,0,0,wwidth,wheight) );
220 if (eyes_apart > 0) {
221 const double stationary= 0.07;
223 eye_x= eyes_apart < eyes_apart_preferred
225 eyes_apart < (eyes_apart_preferred + stationary)
226 ? eyes_apart_preferred
227 : eyes_apart - stationary;
228 eye_x /= sizeadj_scale;
229 drawtriangles(&dmblue);
231 drawtriangles(&dmred);
233 drawtriangles(&dmwhite);
234 printf("shown, %d/%d triangles cut\n", ncut, ntris);
237 XA( XSetWindowBackgroundPixmap(display,window,pixmap) );
238 XA( XClearWindow(display,window) );
239 currentbuffer= !currentbuffer;
242 static void show(void) {
243 scale_wmindim= sizeadj_scale * wmindim;
245 transform_coordinates();
246 generate_display_list();
248 display_conformation();
253 void (*start)(const XButtonEvent *e);
254 void (*delta)(double dx, double dy);
255 void (*conclude)(void);
256 void (*abandon)(void);
260 static const Drag drag_##x= { \
261 #x, drag_##x##_start, drag_##x##_delta, \
262 drag_##x##_conclude, drag_##x##_abandon \
265 #define DRAG_SAVING(x, thing, hook) \
266 static typeof(thing) original_##thing; \
267 static void drag_##x##_start(const XButtonEvent *e) { \
268 memcpy(&original_##thing, &thing, sizeof(thing)); \
271 static void drag_##x##_conclude(void) { } \
272 static void drag_##x##_abandon(void) { \
273 memcpy(&thing, &original_##thing, sizeof(thing)); \
278 static void drag_none_start(const XButtonEvent *e) { }
279 static void drag_none_delta(double dx, double dy) { }
280 static void drag_none_conclude(void) { }
281 static void drag_none_abandon(void) { }
284 static void pvectorcore(const char *n, double v[D3]) {
287 K printf("%# 10.10f ",v[k]);
290 static void pvector(const char *n, double v[D3]) {
294 static void pmatrix(const char *n, double m[D3][D3]) {
296 for (j=0; j<D3; j++) { pvectorcore(n,m[j]); n=""; }
299 #define PMATRIX(x) pmatrix(#x,x);
301 static double drag_transform_conv_x_z= 0;
302 static double drag_transform_conv_y_z= 0;
304 static void drag_transform_prep(const XButtonEvent *e) {
305 static const double factor= 2.5;
306 drag_transform_conv_x_z= MAX( MIN(e->y * factor / wheight - (factor/2),
308 drag_transform_conv_y_z= MAX( MIN(e->x * factor / wwidth - (factor/2),
310 printf("drag_transform_conv_{x,y}_z = %g,%g\n",
311 drag_transform_conv_x_z, drag_transform_conv_y_z);
314 static void make_z_rotation(double rotz[D3][D3], double cz, double sz) {
315 rotz[0][0]= cz; rotz[0][1]= sz; rotz[0][2]= 0;
316 rotz[1][0]= -sz; rotz[1][1]= cz; rotz[1][2]= 0;
317 rotz[2][0]= 0; rotz[2][1]= 0; rotz[2][2]= 1;
320 static void drag_rotate_delta(double dx, double dy) {
321 /* We multiple our transformation matrix by a matrix:
323 * If we just had y movement, we would rotate about x axis:
324 * rotation X = [ 1 0 0 ]
327 * where cy and sy are sin and cos of y rotation
329 * But we should pre-rotate this by a rotation about the z axis
330 * to get it to the right angle (to include x rotation). So
331 * we make cy and sy be cos() and sin(hypot(x,y)) and use
332 * with cr,sr as cos() and sin(atan2(y,y)):
334 * Ie we would do T' = Z R^T X R T where
335 * or T' = Z C T where C = R^T X R and
337 * adjustment R = [ cr sr 0 ]
339 * [ 0 0 1 ] or make_z_rotation(cr,sr)
341 * rotation Z = [ cz sz 0 ]
343 * [ 0 0 1 ] or make_z_rotation(cz,sz)
346 double rotx[D3][D3], adjr[D3][D3], rotz[D3][D3];
351 static double temp[D3][D3], change[D3][D3];
352 static GSL_MATRIX(temp);
353 static GSL_MATRIX(change);
355 printf("\nTRANSFORM %g, %g\n", dx,dy);
357 double dz= -drag_transform_conv_x_z * dx +
358 drag_transform_conv_y_z * dy;
360 dx *= (1 - fabs(drag_transform_conv_x_z));
361 dy *= (1 - fabs(drag_transform_conv_y_z));
363 double d= hypot(dx,dy);
365 printf(" dx,dy,dz = %g, %g, %g d = %g\n", dx,dy,dz, d);
367 if (hypot(d,dz) < 1e-6) return;
369 printf(" no xy rotation\n");
384 printf("\n d=%g cy,sy=%g,%g cr,sr=%g,%g\n\n", d,cy,sy,cr,sr);
386 rotx[0][0]= 1; rotx[0][1]= 0; rotx[0][2]= 0;
387 rotx[1][0]= 0; rotx[1][1]= cy; rotx[1][2]= sy;
388 rotx[2][0]= 0; rotx[2][1]= -sy; rotx[2][2]= cy;
391 make_z_rotation(adjr,cr,sr);
394 GA( gsl_blas_dgemm(CblasNoTrans,CblasNoTrans, 1.0,
397 pmatrix("X R", temp);
399 GA( gsl_blas_dgemm(CblasTrans,CblasNoTrans, 1.0,
405 make_z_rotation(rotz,cos(angz),sin(angz));
408 GA( gsl_blas_dgemm(CblasTrans,CblasNoTrans, 1.0,
409 &rotz_gsl,&change_gsl,
411 pmatrix("Z C", temp);
413 static double skew[D3][D3];
414 static GSL_MATRIX(skew);
416 GA( gsl_blas_dgemm(CblasNoTrans,CblasNoTrans, 1.0,
417 &temp_gsl, &transform_gsl,
421 memcpy(&transform,&skew,sizeof(transform));
425 /* Now we want to normalise skew, the result becomes new transform */
426 double svd_v[D3][D3];
429 double sigma[D3], tau[D3];
433 /* We use notation from Wikipedia Polar_decomposition
434 * Wikipedia's W is GSL's U
435 * Wikipedia's Sigma is GSL's S
436 * Wikipedia's V is GSL's V
437 * Wikipedia's U is our desired result
438 * Wikipedia which says if the SVD is A = W Sigma V*
439 * then the polar decomposition is A = U P
440 * where P = V Sigma V*
444 GA( gsl_linalg_SV_decomp(&skew_gsl, &svd_v_gsl, &sigma_gsl, &tau_gsl) );
446 pvector("Sigma",sigma);
449 /* We only need U, not P. */
450 GA( gsl_blas_dgemm(CblasNoTrans,CblasTrans, 1.0,
451 &skew_gsl,&svd_v_gsl,
452 0.0,&transform_gsl) );
454 pmatrix("U", transform);
456 printf("drag_rotate_delta...\n");
459 DRAG_SAVING(rotate, transform, drag_transform_prep(e));
461 static void drag_sizeadj_delta(double dx, double dy) {
462 sizeadj_scale *= pow(3.0, -dy);
465 DRAG_SAVING(sizeadj, sizeadj_scale, );
467 static void drag_3d_delta(double dx, double dy) {
468 eyes_apart += dx * 0.1;
469 if (eyes_apart < eyes_apart_min) eyes_apart= eyes_apart_min;
470 printf("sizeadj eyes_apart %g\n", eyes_apart);
473 DRAG_SAVING(3d, eyes_apart, );
475 static const Drag *drag= &drag_none;
477 static int drag_last_x, drag_last_y;
479 static void drag_position(int x, int y) {
480 drag->delta((x - drag_last_x) * 1.0 / wmaxdim,
481 (y - drag_last_y) * 1.0 / wmaxdim);
486 static void event_button(XButtonEvent *e) {
487 if (e->window != window || !e->same_screen) return;
488 if (e->type == ButtonPress) {
489 if (e->state || drag != &drag_none) {
490 printf("drag=%s press state=0x%lx abandon\n",
491 drag->name, (unsigned long)e->state);
497 case Button1: drag= &drag_rotate; break;
498 case Button2: drag= &drag_sizeadj; break;
499 case Button3: drag= &drag_3d; break;
500 default: printf("unknown drag start %d\n", e->button);
502 printf("drag=%s press button=%lu start %d,%d\n",
503 drag->name, (unsigned long)e->button, e->x, e->y);
508 if (e->type == ButtonRelease) {
509 printf("drag=%s release %d,%d\n", drag->name, e->x, e->y);
510 drag_position(e->x, e->y);
516 static void event_motion(int x, int y) {
517 printf("drag=%s motion %d,%d\n", drag->name, x, y);
521 static void event_key(XKeyEvent *e) {
526 r= XLookupString(e,buf,sizeof(buf)-1,&ks,0);
528 printf("XLookupString keycode=%u state=0x%x gave %d\n",
529 e->keycode, e->state, r);
533 if (!strcmp(buf,"q")) exit(0);
534 if (!strcmp(buf,"w")) {
535 wireframe= !wireframe;
539 if (!strcmp(buf,"d")) {
540 eyes_apart= eyes_apart>0 ? eyes_apart_min : eyes_apart_preferred;
546 static void event_config(XConfigureEvent *e) {
547 if (e->width == wwidth && e->height == wheight)
550 wwidth= e->width; wheight= e->height;
551 wmaxdim= wwidth > wheight ? wwidth : wheight;
552 wmindim= wwidth < wheight ? wwidth : wheight;
554 XA( XSetWindowBackground(display,window,BlackPixel(display,x11screen)) );
555 for (currentbuffer=0; currentbuffer<2; currentbuffer++)
556 XA( XFreePixmap(display, doublebuffers[currentbuffer]) );
562 static void check_input(void) {
566 r= stat(input_filename, &newstab);
567 if (r<0) diee("could not check input");
569 #define CI(x) if (newstab.st_##x == input_stab.st_##x) ; else goto changed
581 int main(int argc, const char *const *argv) {
582 static const int wantedevents= POLLIN|POLLPRI|POLLERR|POLLHUP;
585 int k, i, r, *xfds, nxfds, polls_alloc=0;
586 struct pollfd *polls=0;
587 int motion_deferred=0, motion_x=-1, motion_y=-1;
589 if (argc != 2 || argv[1][0]=='-') {
590 fputs("need filename\n",stderr); exit(8);
592 input_filename= argv[1];
595 K transform[k][k]= 1.0;
599 XMapWindow(display,window);
602 XA( XInternalConnectionNumbers(display, &xfds, &nxfds) );
603 if (polls_alloc <= nxfds) {
604 polls_alloc= nxfds + polls_alloc + 1;
605 polls= realloc(polls, sizeof(*polls) * polls_alloc);
606 if (!polls) diee("realloc for pollfds");
608 for (i=0; i<nxfds; i++) {
609 polls[i].fd= xfds[i];
610 polls[i].events= wantedevents;
615 polls[i].fd= ConnectionNumber(display);
616 polls[i].events= wantedevents;
618 r= poll(polls, nxfds+1, motion_deferred ? 0 : 200);
619 if (r<0) diee("poll");
621 for (i=0; i<nxfds; i++)
622 if (polls[i].revents)
623 XProcessInternalConnection(display, polls[i].fd);
625 r= XCheckMaskEvent(display,~0UL,&event);
627 if (motion_deferred) {
628 event_motion(motion_x, motion_y);
635 switch (event.type) {
638 case ButtonRelease: event_button(&event.xbutton); break;
640 case KeyPress: event_key(&event.xkey); break;
642 case ConfigureNotify: event_config(&event.xconfigure); break;
645 motion_x= event.xmotion.x;
646 motion_y= event.xmotion.y;
651 printf("unknown event type %u 0x%x\n", event.type,event.type);