gnuplot-old/src/plot3d.c at axis_branch_base · gnuplot/gnuplot-old · GitHub

Repository navigation

History

1679 lines (1460 loc) · 48.5 KB

Raw

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

320

321

322

323

324

325

326

327

328

329

330

331

332

333

334

335

336

337

338

339

340

341

342

343

344

345

346

347

348

349

350

351

352

353

354

355

356

357

358

359

360

361

362

363

364

365

366

367

368

369

370

371

372

373

374

375

376

377

378

379

380

381

382

383

384

385

386

387

388

389

390

391

392

393

394

395

396

397

398

399

400

401

402

403

404

405

406

407

408

409

410

411

412

413

414

415

416

417

418

419

420

421

422

423

424

425

426

427

428

429

430

431

432

433

434

435

436

437

438

439

440

441

442

443

444

445

446

447

448

449

450

451

452

453

454

455

456

457

458

459

460

461

462

463

464

465

466

467

468

469

470

471

472

473

474

475

476

477

478

479

480

481

482

483

484

485

486

487

488

489

490

491

492

493

494

495

496

497

498

499

500

501

502

503

504

505

506

507

508

509

510

511

512

513

514

515

516

517

518

519

520

521

522

523

524

525

526

527

528

529

530

531

532

533

534

535

536

537

538

539

540

541

542

543

544

545

546

547

548

549

550

551

552

553

554

555

556

557

558

559

560

561

562

563

564

565

566

567

568

569

570

571

572

573

574

575

576

577

578

579

580

581

582

583

584

585

586

587

588

589

590

591

592

593

594

595

596

597

598

599

600

601

602

603

604

605

606

607

608

609

610

611

612

613

614

615

616

617

618

619

620

621

622

623

624

625

626

627

628

629

630

631

632

633

634

635

636

637

638

639

640

641

642

643

644

645

646

647

648

649

650

651

652

653

654

655

656

657

658

659

660

661

662

663

664

665

666

667

668

669

670

671

672

673

674

675

676

677

678

679

680

681

682

683

684

685

686

687

688

689

690

691

692

693

694

695

696

697

698

699

700

701

702

703

704

705

706

707

708

709

710

711

712

713

714

715

716

717

718

719

720

721

722

723

724

725

726

727

728

729

730

731

732

733

734

735

736

737

738

739

740

741

742

743

744

745

746

747

748

749

750

751

752

753

754

755

756

757

758

759

760

761

762

763

764

765

766

767

768

769

770

771

772

773

774

775

776

777

778

779

780

781

782

783

784

785

786

787

788

789

790

791

792

793

794

795

796

797

798

799

800

801

802

803

804

805

806

807

808

809

810

811

812

813

814

815

816

817

818

819

820

821

822

823

824

825

826

827

828

829

830

831

832

833

834

835

836

837

838

839

840

841

842

843

844

845

846

847

848

849

850

851

852

853

854

855

856

857

858

859

860

861

862

863

864

865

866

867

868

869

870

871

872

873

874

875

876

877

878

879

880

881

882

883

884

885

886

887

888

889

890

891

892

893

894

895

896

897

898

899

900

901

902

903

904

905

906

907

908

909

910

911

912

913

914

915

916

917

918

919

920

921

922

923

924

925

926

927

928

929

930

931

932

933

934

935

936

937

938

939

940

941

942

943

944

945

946

947

948

949

950

951

952

953

954

955

956

957

958

959

960

961

962

963

964

965

966

967

968

969

970

971

972

973

974

975

976

977

978

979

980

981

982

983

984

985

986

987

988

989

990

991

992

993

994

995

996

997

998

999

1000

#ifndef lint

static char *RCSid() { return RCSid("$Id: plot3d.c,v 1.20.2.6 2000/10/24 18:58:12 broeker Exp $"); }

#endif

/* GNUPLOT - plot3d.c */

/*[

* Permission to use, copy, and distribute this software and its

* documentation for any purpose with or without fee is hereby granted,

* provided that the above copyright notice appear in all copies and

* that both that copyright notice and this permission notice appear

* in supporting documentation.

* Permission to modify the software is granted, but not the right to

* distribute the complete modified source code. Modifications are to

* be distributed as patches to the released version. Permission to

* distribute binaries produced by compiling modified sources is granted,

* provided you

* 1. distribute the corresponding source modifications from the

* released version in the form of a patch file along with the binaries,

* 2. add special version identification to distinguish your version

* in addition to the base release version number,

* 3. provide your name and address as the primary contact for the

* support of your modified version, and

* 4. retain our contact information in regard to use of the base

* software.

* Permission to distribute the released version of the source code along

* with corresponding source modifications in the form of a patch file is

* granted with same provisions 2 through 4 for binary distributions.

* This software is provided "as is" without express or implied warranty

* to the extent permitted by applicable law.

]*/

#include "plot3d.h"

#include "gp_types.h"

#include "alloc.h"

#include "axis.h"

#include "binary.h"

#include "command.h"

#include "contour.h"

#include "datafile.h"

#include "graph3d.h"

#include "internal.h"

#include "misc.h"

#include "parse.h"

/* #include "setshow.h" */

#include "term_api.h"

#include "util.h"

#ifdef THIN_PLATE_SPLINES_GRID

#include "matrix.h"

#endif

#ifndef _Windows

# include "help.h"

#endif

/* global variables exported by this module */

t_data_mapping mapping3d = MAP3D_CARTESIAN;

int dgrid3d_row_fineness = 10;

int dgrid3d_col_fineness = 10;

int dgrid3d_norm_value = 1;

TBOOLEAN dgrid3d = FALSE;

/* static prototypes */

static void calculate_set_of_isolines __PROTO((AXIS_INDEX value_axis, TBOOLEAN cross, struct iso_curve **this_iso,

AXIS_INDEX iso_axis, double iso_min, double iso_step, int num_iso_to_use,

AXIS_INDEX sam_axis, double sam_min, double sam_step, int num_sam_to_use));

static void get_3ddata __PROTO((struct surface_points * this_plot));

static void print_3dtable __PROTO((int pcount));

static void eval_3dplots __PROTO((void));

static void grid_nongrid_data __PROTO((struct surface_points * this_plot));

static void parametric_3dfixup __PROTO((struct surface_points * start_plot, int *plot_num));

static struct surface_points * sp_alloc __PROTO((int num_samp_1, int num_iso_1, int num_samp_2, int num_iso_2));

static void sp_replace __PROTO((struct surface_points *sp, int num_samp_1, int num_iso_1, int num_samp_2, int num_iso_2));

/* the curves/surfaces of the plot */

struct surface_points *first_3dplot = NULL;

static struct udft_entry plot_func;

int plot3d_num=0;

/* HBB 20000508: moved these functions to the only module that uses them

* so they can be turned 'static' */

* sp_alloc() allocates a surface_points structure that can hold 'num_iso_1'

* iso-curves with 'num_samp_2' samples and 'num_iso_2' iso-curves with

* 'num_samp_1' samples.

* If, however num_iso_2 or num_samp_1 is zero no iso curves are allocated.

static struct surface_points *

sp_alloc(num_samp_1, num_iso_1, num_samp_2, num_iso_2)

int num_samp_1, num_iso_1, num_samp_2, num_iso_2;

{

struct surface_points *sp;

sp = (struct surface_points *) gp_alloc(sizeof(struct surface_points),

"surface");

sp->next_sp = NULL;

sp->title = NULL;

sp->contours = NULL;

sp->iso_crvs = NULL;

sp->num_iso_read = 0;

if (num_iso_2 > 0 && num_samp_1 > 0) {

int i;

struct iso_curve *icrv;

for (i = 0; i < num_iso_1; i++) {

icrv = iso_alloc(num_samp_2);

icrv->next = sp->iso_crvs;

sp->iso_crvs = icrv;

}

for (i = 0; i < num_iso_2; i++) {

icrv = iso_alloc(num_samp_1);

icrv->next = sp->iso_crvs;

sp->iso_crvs = icrv;

}

} else

sp->iso_crvs = (struct iso_curve *) NULL;

return (sp);

}

* sp_replace() updates a surface_points structure so it can hold 'num_iso_1'

* iso-curves with 'num_samp_2' samples and 'num_iso_2' iso-curves with

* 'num_samp_1' samples.

* If, however num_iso_2 or num_samp_1 is zero no iso curves are allocated.

static void

sp_replace(sp, num_samp_1, num_iso_1, num_samp_2, num_iso_2)

struct surface_points *sp;

int num_samp_1, num_iso_1, num_samp_2, num_iso_2;

{

int i;

struct iso_curve *icrv, *icrvs = sp->iso_crvs;

while (icrvs) {

icrv = icrvs;

icrvs = icrvs->next;

iso_free(icrv);

}

sp->iso_crvs = NULL;

if (num_iso_2 > 0 && num_samp_1 > 0) {

for (i = 0; i < num_iso_1; i++) {

icrv = iso_alloc(num_samp_2);

icrv->next = sp->iso_crvs;

sp->iso_crvs = icrv;

}

for (i = 0; i < num_iso_2; i++) {

icrv = iso_alloc(num_samp_1);

icrv->next = sp->iso_crvs;

sp->iso_crvs = icrv;

}

} else

sp->iso_crvs = (struct iso_curve *) NULL;

}

* sp_free() releases any memory which was previously malloc()'d to hold

* surface points.

/* HBB 20000506: don't risk stack havoc by recursion, use iterative list

* cleanup unstead */

void

sp_free(sp)

struct surface_points *sp;

{

while (sp) {

struct surface_points *next = sp->next_sp;

if (sp->title)

free(sp->title);

while (sp->contours) {

struct gnuplot_contours *next_cntrs = sp->contours->next;

free(sp->contours->coords);

free(sp->contours);

sp->contours = next_cntrs;

}

while (sp->iso_crvs) {

struct iso_curve *next_icrvs = sp->iso_crvs->next;

iso_free(sp->iso_crvs);

sp->iso_crvs = next_icrvs;

}

free(sp);

sp = next;

}

/* support for dynamic size of input line */

void

plot3drequest()

* in the parametric case we would say splot [u= -Pi:Pi] [v= 0:2*Pi] [-1:1]

* [-1:1] [-1:1] sin(v)*cos(u),sin(v)*cos(u),sin(u) in the non-parametric

* case we would say only splot [x= -2:2] [y= -5:5] sin(x)*cos(y)

{

int dummy_token0 = -1, dummy_token1 = -1;

AXIS_INDEX u_axis, v_axis;

is_3d_plot = TRUE;

if (parametric && strcmp(set_dummy_var[0], "t") == 0) {

strcpy(set_dummy_var[0], "u");

strcpy(set_dummy_var[1], "v");

}

/* put stuff into arrays to simplify access */

AXIS_INIT3D(FIRST_X_AXIS, 0, 0);

AXIS_INIT3D(FIRST_Y_AXIS, 0, 0);

AXIS_INIT3D(FIRST_Z_AXIS, 0, 1);

AXIS_INIT3D(U_AXIS, 1, 0);

AXIS_INIT3D(V_AXIS, 1, 0);

if (!term) /* unknown */

int_error(c_token, "use 'set term' to set terminal type first");

u_axis = (parametric ? U_AXIS : FIRST_X_AXIS);

v_axis = (parametric ? V_AXIS : FIRST_Y_AXIS);

PARSE_NAMED_RANGE(u_axis, dummy_token0);

PARSE_NAMED_RANGE(v_axis, dummy_token1);

if (parametric) {

PARSE_RANGE(FIRST_X_AXIS);

PARSE_RANGE(FIRST_Y_AXIS);

} /* parametric */

PARSE_RANGE(FIRST_Z_AXIS);

CHECK_REVERSE(FIRST_X_AXIS);

CHECK_REVERSE(FIRST_Y_AXIS);

CHECK_REVERSE(FIRST_Z_AXIS);

/* use the default dummy variable unless changed */

if (dummy_token0 >= 0)

copy_str(c_dummy_var[0], dummy_token0, MAX_ID_LEN);

else

(void) strcpy(c_dummy_var[0], set_dummy_var[0]);

if (dummy_token1 >= 0)

copy_str(c_dummy_var[1], dummy_token1, MAX_ID_LEN);

else

(void) strcpy(c_dummy_var[1], set_dummy_var[1]);

eval_3dplots();

}

#ifdef THIN_PLATE_SPLINES_GRID

static double splines_kernel __PROTO((double h));

/* HBB 991025 FIXME: these don't belong in here --> move to 'matrix' */

static void lu_decomp __PROTO((double **, int, int *, double *));

static void lu_backsubst __PROTO((double **, int n, int *, double *));

static double

splines_kernel(h)

double h;

{

/* this is normaly not usefull ... */

h = fabs(h);

if (h != 0.0) {

return h * h * log(h);

} else {

return 0;

}

#define Swap(a,b) {double tmp; tmp=a; a=b; b=tmp;}

static void

lu_decomp(a, n, indx, d)

double **a;

int n;

int *indx;

double *d;

{

int i, imax = -1, j, k; /* HBB: added initial value, to shut up gcc -Wall */

double large, dummy, temp, **ar, **lim, *limc, *ac, *dp, *vscal;

dp = vscal = vec(n);

*d = 1.0;

for (ar = a, lim = &(a[n]); ar < lim; ar++) {

large = 0.0;

for (ac = *ar, limc = &(ac[n]); ac < limc;)

if ((temp = fabs(*ac++)) > large)

large = temp;

if (large == 0.0)

int_error(NO_CARET, "Singular matrix in LU-DECOMP");

*dp++ = 1 / large;

}

ar = a;

for (j = 0; j < n; j++, ar++) {

for (i = 0; i < j; i++) {

ac = &(a[i][j]);

for (k = 0; k < i; k++)

*ac -= a[i][k] * a[k][j];

}

large = 0.0;

dp = &(vscal[j]);

for (i = j; i < n; i++) {

ac = &(a[i][j]);

for (k = 0; k < j; k++)

*ac -= a[i][k] * a[k][j];

if ((dummy = *dp++ * fabs(*ac)) >= large) {

large = dummy;

imax = i;

}

if (j != imax) {

ac = a[imax];

dp = *ar;

for (k = 0; k < n; k++, ac++, dp++)

Swap(*ac, *dp);

*d = -(*d);

vscal[imax] = vscal[j];

}

indx[j] = imax;

if (*(dp = &(*ar)[j]) == 0)

*dp = 1e-30;

if (j != n - 1) {

dummy = 1 / (*ar)[j];

for (i = j + 1; i < n; i++)

a[i][j] *= dummy;

}

free(vscal);

}

static void

lu_backsubst(a, n, indx, b)

double **a;

int n;

int *indx;

double *b;

{

int i, memi = -1, ip, j;

double sum, *bp, *bip, **ar, *ac;

ar = a;

for (i = 0; i < n; i++, ar++) {

ip = indx[i];

sum = b[ip];

b[ip] = b[i];

if (memi >= 0) {

ac = &((*ar)[memi]);

bp = &(b[memi]);

for (j = memi; j <= i - 1; j++)

sum -= *ac++ * *bp++;

} else if (sum)

memi = i;

b[i] = sum;

}

ar--;

for (i = n - 1; i >= 0; i--) {

ac = &(*ar)[i + 1];

bp = &(b[i + 1]);

bip = &(b[i]);

for (j = i + 1; j < n; j++)

*bip -= *ac++ * *bp++;

*bip /= (*ar--)[i];

}

#endif

static void

grid_nongrid_data(this_plot)

struct surface_points *this_plot;

{

int i, j, k;

double x, y, z, w, dx, dy, xmin, xmax, ymin, ymax;

struct iso_curve *old_iso_crvs = this_plot->iso_crvs;

struct iso_curve *icrv, *oicrv, *oicrvs;

#ifdef THIN_PLATE_SPLINES_GRID

double *b, **K, *xx, *yy, *zz, d;

int *indx, numpoints;

#endif

/* Compute XY bounding box on the original data. */

xmin = xmax = old_iso_crvs->points[0].x;

ymin = ymax = old_iso_crvs->points[0].y;

for (icrv = old_iso_crvs; icrv != NULL; icrv = icrv->next) {

struct coordinate GPHUGE *points = icrv->points;

for (i = 0; i < icrv->p_count; i++, points++) {

if (xmin > points->x)

xmin = points->x;

if (xmax < points->x)

xmax = points->x;

if (ymin > points->y)

ymin = points->y;

if (ymax < points->y)

ymax = points->y;

}

dx = (xmax - xmin) / (dgrid3d_col_fineness - 1);

dy = (ymax - ymin) / (dgrid3d_row_fineness - 1);

/* Create the new grid structure, and compute the low pass filtering from

* non grid to grid structure.

this_plot->iso_crvs = NULL;

this_plot->num_iso_read = dgrid3d_col_fineness;

this_plot->has_grid_topology = TRUE;

#ifdef THIN_PLATE_SPLINES_GRID

numpoints = 0;

for (oicrv = old_iso_crvs; oicrv != NULL; oicrv = oicrv->next) {

numpoints += oicrv->p_count;

}

xx = (double *) gp_alloc(sizeof(double) * (numpoints + 3) * (numpoints + 8),

"thin plate splines in dgrid3d");

/* the memory needed is not really (n+3)*(n+8) for now,

but might be if I take into account errors ... */

K = (double **) gp_alloc(sizeof(double *) * (numpoints + 3),

"matrix : thin plate splines 2d");

yy = xx + numpoints;

zz = yy + numpoints;

b = zz + numpoints;

i = 0;

for (oicrv = old_iso_crvs; oicrv != NULL; oicrv = oicrv->next) {

struct coordinate GPHUGE *opoints = oicrv->points;

for (k = 0; k < oicrv->p_count; k++, opoints++) {

xx[i] = opoints->x;

yy[i] = opoints->y;

zz[i] = opoints->z;

i++;

}

for (i = 0; i < numpoints + 3; i++) {

K[i] = b + (numpoints + 3) * (i + 1);

}

for (i = 0; i < numpoints; i++) {

for (j = i + 1; j < numpoints; j++) {

double dx = xx[i] - xx[j], dy = yy[i] - yy[j];

K[i][j] = K[j][i] = -splines_kernel(sqrt(dx * dx + dy * dy));

}

K[i][i] = 0.0; /* here will come the weights for errors */

b[i] = zz[i];

}

for (i = 0; i < numpoints; i++) {

K[i][numpoints] = K[numpoints][i] = 1.0;

K[i][numpoints + 1] = K[numpoints + 1][i] = xx[i];

K[i][numpoints + 2] = K[numpoints + 2][i] = yy[i];

}

b[numpoints] = 0.0;

b[numpoints + 1] = 0.0;

b[numpoints + 2] = 0.0;

K[numpoints][numpoints] = 0.0;

K[numpoints][numpoints + 1] = 0.0;

K[numpoints][numpoints + 2] = 0.0;

K[numpoints + 1][numpoints] = 0.0;

K[numpoints + 1][numpoints + 1] = 0.0;

K[numpoints + 1][numpoints + 2] = 0.0;

K[numpoints + 2][numpoints] = 0.0;

K[numpoints + 2][numpoints + 1] = 0.0;

K[numpoints + 2][numpoints + 2] = 0.0;

indx = (int *) gp_alloc(sizeof(int) * (numpoints + 3), "indexes lu");

/* actually, K is *not* positive definite, but

has only non zero real eigenvalues ->

we can use an lu_decomp safely */

lu_decomp(K, numpoints + 3, indx, &d);

lu_backsubst(K, numpoints + 3, indx, b);

#endif /* THIN_PLATE_SPLINES_GRID */

for (i = 0, x = xmin; i < dgrid3d_col_fineness; i++, x += dx) {

struct coordinate GPHUGE *points;

icrv = iso_alloc(dgrid3d_row_fineness + 1);

icrv->p_count = dgrid3d_row_fineness;

icrv->next = this_plot->iso_crvs;

this_plot->iso_crvs = icrv;

points = icrv->points;

for (j = 0, y = ymin; j < dgrid3d_row_fineness; j++, y += dy, points++) {

z = w = 0.0;

#ifndef BUGGY_DGRID_RANGING /* HBB 981209 */

/* as soon as ->type is changed to UNDEFINED, break out of

* two inner loops! */

points->type = INRANGE;

#endif

#ifdef THIN_PLATE_SPLINES_GRID

z = b[numpoints];

for (k = 0; k < numpoints; k++) {

double dx = xx[k] - x, dy = yy[k] - y;

z = z - b[k] * splines_kernel(sqrt(dx * dx + dy * dy));

}

z = z + b[numpoints + 1] * x + b[numpoints + 2] * y;

#else

for (oicrv = old_iso_crvs; oicrv != NULL; oicrv = oicrv->next) {

struct coordinate GPHUGE *opoints = oicrv->points;

for (k = 0; k < oicrv->p_count; k++, opoints++) {

double dist, dist_x = fabs(opoints->x - x), dist_y = fabs(opoints->y - y);

switch (dgrid3d_norm_value) {

case 1:

dist = dist_x + dist_y;

break;

case 2:

dist = dist_x * dist_x + dist_y * dist_y;

break;

case 4:

dist = dist_x * dist_x + dist_y * dist_y;

dist *= dist;

break;

case 8:

dist = dist_x * dist_x + dist_y * dist_y;

dist *= dist;

break;

case 16:

dist = dist_x * dist_x + dist_y * dist_y;

dist *= dist;

break;

default:

dist = pow(dist_x, (double) dgrid3d_norm_value) +

pow(dist_y, (double) dgrid3d_norm_value);

break;

}

/* The weight of this point is inverse proportional

* to the distance.

if (dist == 0.0) {

#ifndef BUGGY_DGRID_RANGING

/* HBB 981209: revised flagging as undefined */

/* Supporting all those infinities on various

* platforms becomes tiresome, to say the least :-(

* Let's just return the first z where this happens,

* unchanged, and be done with this, period. */

points->type = UNDEFINED;

z = opoints->z;

w = 1.0;

break; /* out of for (k...) loop */

#else

#if !defined(AMIGA_SC_6_1) && !defined(__PUREC__)

dist = VERYLARGE;

#else /* !AMIGA_SC_6_1 && !__PUREC__ */

/* Multiplying VERYLARGE by opoints->z below

* might yield Inf (i.e. a number that can't

* be represented on the machine). This will

* result in points->z being set to NaN. It's

* better to have a pretty large number that is

* also on the safe side... The numbers that are

* read by gnuplot are float values anyway, so

* they can't be bigger than FLT_MAX. So setting

* dist to FLT_MAX^2 will make dist pretty large

* with respect to any value that has been read. */

dist = ((double) FLT_MAX) * ((double) FLT_MAX);

#endif /* !AMIGA_SC_6_1 && !__PUREC__ */

#endif /* BUGGY_DGRID_RANGING */

} else

dist = 1.0 / dist;

z += opoints->z * dist;

w += dist;

}

#ifndef BUGGY_DGRID_RANGING

if (points->type != INRANGE)

break; /* out of the second-inner loop as well ... */

#endif

}

#endif /* THIN_PLATE_SPLINES_GRID */

#ifndef BUGGY_DGRID_RANGING

/* Now that we've escaped the loops safely, we know that we

* do have a good value in z and w, so we can proceed just as

* if nothing had happened at all. Nice, isn't it? */

points->type = INRANGE;

STORE_WITH_LOG_AND_UPDATE_RANGE(points->x, x, points->type, x_axis, NOOP, continue);

STORE_WITH_LOG_AND_UPDATE_RANGE(points->y, y, points->type, y_axis, NOOP, continue);

#ifndef THIN_PLATE_SPLINES_GRID

STORE_WITH_LOG_AND_UPDATE_RANGE(points->z, z / w, points->type, z_axis, NOOP, continue);

#else

STORE_WITH_LOG_AND_UPDATE_RANGE(points->z, z, points->type, z_axis, NOOP, continue);

#endif

#else

/* HBB 981026: original, short version of this code */

points->x = x;

points->y = y;

points->z = z / w;

points->type = INRANGE;

#endif

}

#ifdef THIN_PLATE_SPLINES_GRID

free(K);

free(xx);

free(indx);

#endif

/* Delete the old non grid data. */

for (oicrvs = old_iso_crvs; oicrvs != NULL;) {

oicrv = oicrvs;

oicrvs = oicrvs->next;

iso_free(oicrv);

}

static void

get_3ddata(this_plot)

struct surface_points *this_plot;

/* this_plot->token is end of datafile spec, before title etc

* will be moved passed title etc after we return

{

int xdatum = 0;

int ydatum = 0;

int i, j;

double v[3];

int pt_in_iso_crv = 0;

struct iso_curve *this_iso;

if (mapping3d == MAP3D_CARTESIAN) {

if (df_no_use_specs == 2)

int_error(this_plot->token, "Need 1 or 3 columns for cartesian data");

} else {

if (df_no_use_specs == 1)

int_error(this_plot->token, "Need 2 or 3 columns for polar data");

}

this_plot->num_iso_read = 0;

this_plot->has_grid_topology = TRUE;

/* we ought to keep old memory - most likely case

* is a replot, so it will probably exactly fit into

* memory already allocated ?

if (this_plot->iso_crvs != NULL) {

struct iso_curve *icrv, *icrvs = this_plot->iso_crvs;

while (icrvs) {

icrv = icrvs;

icrvs = icrvs->next;

iso_free(icrv);

}

this_plot->iso_crvs = NULL;

}

/* data file is already open */

if (df_matrix)

xdatum = df_3dmatrix(this_plot);

else {

/*{{{ read surface from text file */

struct iso_curve *local_this_iso = iso_alloc(samples_1);

struct coordinate GPHUGE *cp;

double x, y, z;

while ((j = df_readline(v, 3)) != DF_EOF) {

if (j == DF_SECOND_BLANK)

break; /* two blank lines */

if (j == DF_FIRST_BLANK) {

/* one blank line */

if (pt_in_iso_crv == 0) {

if (xdatum == 0)

continue;

pt_in_iso_crv = xdatum;

}

if (xdatum > 0) {

local_this_iso->p_count = xdatum;

local_this_iso->next = this_plot->iso_crvs;

this_plot->iso_crvs = local_this_iso;

this_plot->num_iso_read++;

if (xdatum != pt_in_iso_crv)

this_plot->has_grid_topology = FALSE;

local_this_iso = iso_alloc(pt_in_iso_crv);

xdatum = 0;

ydatum++;

}

continue;

}

/* its a data point or undefined */

if (xdatum >= local_this_iso->p_max) {

* overflow about to occur. Extend size of points[] array. We

* either double the size, or add 1000 points, whichever is a

* smaller increment. Note i = p_max.

iso_extend(local_this_iso,

xdatum + (xdatum < 1000 ? xdatum : 1000));

}

cp = local_this_iso->points + xdatum;

if (j == DF_UNDEFINED) {

cp->type = UNDEFINED;

continue;

}

cp->type = INRANGE; /* unless we find out different */

switch (mapping3d) {

case MAP3D_CARTESIAN:

switch (j) {

case 1:

x = xdatum;

y = ydatum;

z = v[0];

break;

case 3:

x = v[0];

y = v[1];

z = v[2];

break;

default:

{

int_error(this_plot->token,

"Need 1 or 3 columns - line %d",

df_line_number);

return; /* avoid gcc -Wuninitialised for x,y,z */

}

break;

case MAP3D_SPHERICAL:

if (j < 2)

int_error(this_plot->token, "Need 2 or 3 columns");

if (j < 3)

v[2] = 1; /* default radius */

/* Convert to radians. */

v[0] *= ang2rad;

v[1] *= ang2rad;

x = v[2] * cos(v[0]) * cos(v[1]);

y = v[2] * sin(v[0]) * cos(v[1]);

z = v[2] * sin(v[1]);

break;

case MAP3D_CYLINDRICAL:

if (j < 2)

int_error(this_plot->token, "Need 2 or 3 columns");

if (j < 3)

v[2] = 1; /* default radius */

/* Convert to radians. */

v[0] *= ang2rad;

x = v[2] * cos(v[0]);

y = v[2] * sin(v[0]);

z = v[1];

break;

default:

int_error(NO_CARET, "Internal error : Unknown mapping type");

return;

}

/* adjust for logscales. Set min/max and point types.

* store in cp

cp->type = INRANGE;

/* cannot use continue, as macro is wrapped in a loop.

* I regard this as correct goto use

STORE_WITH_LOG_AND_UPDATE_RANGE(cp->x, x, cp->type, x_axis, NOOP, goto come_here_if_undefined);

STORE_WITH_LOG_AND_UPDATE_RANGE(cp->y, y, cp->type, y_axis, NOOP, goto come_here_if_undefined);

STORE_WITH_LOG_AND_UPDATE_RANGE(cp->z, z, cp->type, z_axis, NOOP, goto come_here_if_undefined);

/* some may complain, but I regard this as the correct use

* of goto

come_here_if_undefined:

++xdatum;

} /* end of whileloop - end of surface */

if (xdatum > 0) {

this_plot->num_iso_read++; /* Update last iso. */

local_this_iso->p_count = xdatum;

local_this_iso->next = this_plot->iso_crvs;

this_plot->iso_crvs = local_this_iso;

if (xdatum != pt_in_iso_crv)

this_plot->has_grid_topology = FALSE;

} else {

iso_free(local_this_iso); /* Free last allocation. */

}

if (dgrid3d && this_plot->num_iso_read > 0)

grid_nongrid_data(this_plot);

/*}}} */

}

if (this_plot->num_iso_read <= 1)

this_plot->has_grid_topology = FALSE;

if (this_plot->has_grid_topology && !hidden3d) {

struct iso_curve *new_icrvs = NULL;

int num_new_iso = this_plot->iso_crvs->p_count, len_new_iso = this_plot->num_iso_read;

/* Now we need to set the other direction (pseudo) isolines. */

for (i = 0; i < num_new_iso; i++) {

struct iso_curve *new_icrv = iso_alloc(len_new_iso);

new_icrv->p_count = len_new_iso;

for (j = 0, this_iso = this_plot->iso_crvs;

this_iso != NULL;

j++, this_iso = this_iso->next) {

/* copy whole point struct to get type too.

* wasteful for windows, with padding */

/* more efficient would be extra pointer to same struct */

new_icrv->points[j] = this_iso->points[i];

}

new_icrv->next = new_icrvs;

new_icrvs = new_icrv;

}

/* Append the new iso curves after the read ones. */

for (this_iso = this_plot->iso_crvs;

this_iso->next != NULL;

this_iso = this_iso->next);

this_iso->next = new_icrvs;

}

static void

print_3dtable(pcount)

int pcount;

{

int i, curve, surface;

struct iso_curve *icrvs;

struct coordinate GPHUGE *points;

char *table_format = NULL;

char *pcat;

table_format = gp_alloc(strlen(axis_array[FIRST_X_AXIS].formatstring)

+strlen(axis_array[FIRST_Y_AXIS].formatstring)

+strlen(axis_array[FIRST_Z_AXIS].formatstring)

+6,

"table format");

strcpy(table_format, axis_array[FIRST_X_AXIS].formatstring);

strcat(table_format, " ");

strcat(table_format, axis_array[FIRST_Y_AXIS].formatstring);

strcat(table_format, " ");

strcat(table_format, axis_array[FIRST_Z_AXIS].formatstring);

pcat = &table_format[strlen(table_format)];

for (surface = 0, this_plot = first_3dplot; surface < pcount;

this_plot = this_plot->next_sp, surface++) {

fprintf(gpoutfile, "\n#Surface %d of %d surfaces\n", surface, pcount);

icrvs = this_plot->iso_crvs;

curve = 0;

if (draw_surface) {

strcpy(pcat," %c\n");

/* only the curves in one direction */

while (icrvs && curve < this_plot->num_iso_read) {

fprintf(gpoutfile, "\n#IsoCurve %d, %d points\n#x y z type\n",

curve, icrvs->p_count);

for (i = 0, points = icrvs->points; i < icrvs->p_count; i++) {

fprintf(gpoutfile, table_format,

points[i].x,

points[i].y,

points[i].z,

points[i].type == INRANGE ? 'i'

: points[i].type == OUTRANGE ? 'o'

: 'u');

}

icrvs = icrvs->next;

curve++;

}

putc('\n', gpoutfile);

}

if (draw_contour) {

int number = 0;

struct gnuplot_contours *c = this_plot->contours;

strcpy(pcat,"\n");

while (c) {

int count = c->num_pts;

struct coordinate GPHUGE *p = c->coords;

if (c->isNewLevel)

/* dont display count - contour split across chunks */

/* put # in case user wants to use it for a plot */

/* double blank line to allow plot ... index ... */

fprintf(gpoutfile, "\n# Contour %d, label: %s\n", number++, c->label);

for (; --count >= 0; ++p)

fprintf(gpoutfile, table_format, p->x, p->y, p->z);

/* blank line between segments of same contour */

putc('\n', gpoutfile);

c = c->next;

}

fflush(gpoutfile);

free(table_format);

}

/* HBB 20000501: code isolated from eval_3dplots(), where practically

* identical code occured twice, for direct and crossing isolines,

* respectively. The latter only are done for in non-hidden3d

* mode. */

static void

calculate_set_of_isolines(value_axis, cross, this_iso,

iso_axis, iso_min, iso_step, num_iso_to_use,

sam_axis, sam_min, sam_step, num_sam_to_use

)

AXIS_INDEX iso_axis, sam_axis, value_axis;

struct iso_curve **this_iso;

TBOOLEAN cross;

double iso_min, iso_step, sam_min, sam_step;

int num_iso_to_use, num_sam_to_use;

{

int i, j;

struct coordinate GPHUGE *points = (*this_iso)->points;

for (j = 0; j < num_iso_to_use; j++) {

double iso = iso_min + j * iso_step;

/* HBB 20000501: with the new code, it should

* be safe to rely on the actual 'v' axis not

* to be improperly logscaled... */

(void) Gcomplex(&plot_func.dummy_values[cross ? 0 : 1],

AXIS_DE_LOG_VALUE(iso_axis, iso), 0.0);

for (i = 0; i < num_sam_to_use; i++) {

double sam = sam_min + i * sam_step;

struct value a;

double temp;

(void) Gcomplex(&plot_func.dummy_values[cross ? 1 : 0],

AXIS_DE_LOG_VALUE(sam_axis, sam), 0.0);

if (cross) {

points[i].x = iso;

points[i].y = sam;

} else {

points[i].x = sam;

points[i].y = iso;

}

evaluate_at(plot_func.at, &a);

if (undefined || (fabs(imag(&a)) > zero)) {

points[i].type = UNDEFINED;

continue;

}

temp = real(&a);

points[i].type = INRANGE;

STORE_WITH_LOG_AND_UPDATE_RANGE(points[i].z, temp, points[i].type,

value_axis, NOOP, NOOP);

}

(*this_iso)->p_count = num_sam_to_use;

*this_iso = (*this_iso)->next;

points = (*this_iso) ? (*this_iso)->points : NULL;

}

* This parses the splot command after any range specifications. To support

* autoscaling on the x/z axis, we want any data files to define the x/y

* range, then to plot any functions using that range. We thus parse the

* input twice, once to pick up the data files, and again to pick up the

* functions. Definitions are processed twice, but that won't hurt.

* div - okay, it doesn't hurt, but every time an option as added for

* datafiles, code to parse it has to be added here. Change so that

* we store starting-token in the plot structure.

static void

eval_3dplots()

{

int i;

struct surface_points **tp_3d_ptr;

int start_token, end_token;

int begin_token;

TBOOLEAN some_data_files = FALSE, some_functions = FALSE;

int plot_num, line_num, point_num;

/* part number of parametric function triplet: 0 = z, 1 = y, 2 = x */

int crnt_param = 0;

View remainder of file in raw view

gnuplot-old/src/plot3d.c at axis_branch_base · gnuplot/gnuplot-old · GitHub

Repository navigation

Expand file tree

Breadcrumbs

plot3d.c

Latest commit

History

Breadcrumbs

plot3d.c

File metadata and controls