summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/asymptote/plain_bounds.asy
blob: c4e24721773e294d6e4548581fc17ff359400dbc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
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
include plain_scaling;

// After a transformation, produce new coordinate bounds.  For paths that
// have been added, this is only an approximation since it takes the bounds of
// their transformed bounding box.
private void addTransformedCoords(coords2 dest, transform t,
                                  coords2 point, coords2 min, coords2 max)
{
  dest.push(t, point, point);

  // Add in all 4 corner coords, to properly size rectangular pictures.
  dest.push(t,min,min);
  dest.push(t,min,max);
  dest.push(t,max,min);
  dest.push(t,max,max);
}

// Adds another sizing restriction to the coordinates, but only if it is
// maximal, that is, if under some scaling, this coordinate could be the
// largest.
private void addIfMaximal(coord[] coords, real user, real truesize) {
  // TODO: Test promoting coordinates for efficiency.

  for (coord c : coords)
    if (user <= c.user && truesize <= c.truesize)
      // Not maximal.
      return;

  // The coordinate is not dominated by any existing extreme, so it is
  // maximal and will be added, but first remove any coords it now dominates.
  int i = 0;
  while (i < coords.length) {
    coord c = coords[i];
    if (c.user <= user && c.truesize <= truesize)
      coords.delete(i);
    else
      ++i;
  }

  // Add the coordinate to the extremes.
  coords.push(coord.build(user, truesize));
}

private void addIfMaximal(coord[] dest, coord[] src)
{
  // This may be inefficient, as it rebuilds the coord struct when adding it.
  for (coord c : src)
    addIfMaximal(dest, c.user, c.truesize);
}

// Same as addIfMaximal, but testing for minimal coords.
private void addIfMinimal(coord[] coords, real user, real truesize) {
  for (coord c : coords)
    if (user >= c.user && truesize >= c.truesize)
      return;

  int i = 0;
  while (i < coords.length) {
    coord c = coords[i];
    if (c.user >= user && c.truesize >= truesize)
      coords.delete(i);
    else
      ++i;
  }

  coords.push(coord.build(user, truesize));
}

private void addIfMinimal(coord[] dest, coord[] src)
{
  for (coord c : src)
    addIfMinimal(dest, c.user, c.truesize);
}

// This stores a list of sizing bounds for picture data.  If the object is
// frozen, then it cannot be modified further, and therefore can be safely
// passed by reference and stored in the sizing data for multiple pictures.
private struct freezableBounds {
  restricted bool frozen = false;
  void freeze() {
    frozen = true;
  }

  // Optional links to further (frozen) sizing data.
  private freezableBounds[] links;

  // Links to (frozen) sizing data that is transformed when added here.
  private static struct transformedBounds {
    transform t;
    freezableBounds link;
  };
  private transformedBounds[] tlinks;

  // The sizing data.  It cannot be modified once this object is frozen.
  private coords2 point, min, max;

  // A bound represented by a path.  Using the path instead of the bounding
  // box means it will be accurate after a transformation by coordinates.
  private path[] pathBounds;

  // A bound represented by a path and a pen.
  // As often many paths use the same pen, we store an array of paths.
  private static struct pathpen {
    path[] g; pen p;

    void operator init(path g, pen p) {
      this.g.push(g);
      this.p = p;
    }
  }
  private static pathpen operator *(transform t, pathpen pp) {
    // Should the pen be transformed?
    pathpen newpp;
    for (path g : pp.g)
      newpp.g.push(t*g);
    newpp.p = pp.p;
    return newpp;
  }

  // WARNING: Due to crazy optimizations, if this array is changed between an
  // empty and non-empty state, the assignment of a method to
  // addPath(path,pen) must also change.
  private pathpen[] pathpenBounds;

  // Once frozen, the sizing is immutable, and therefore we can compute and
  // store the extremal coordinates.
  public static struct extremes {
    coord[] left, bottom, right, top;

    void operator init(coord[] left, coord[] bottom,
                       coord[] right, coord[] top) {
      this.left = left;
      this.bottom = bottom;
      this.right = right;
      this.top = top;
    }

  }
  private static void addMaxToExtremes(extremes e, pair user, pair truesize) {
    addIfMaximal(e.right, user.x, truesize.x);
    addIfMaximal(e.top, user.y, truesize.y);
  }
  private static void addMinToExtremes(extremes e, pair user, pair truesize) {
    addIfMinimal(e.left, user.x, truesize.x);
    addIfMinimal(e.bottom, user.y, truesize.y);
  }
  private static void addMaxToExtremes(extremes e, coords2 coords) {
    addIfMaximal(e.right, coords.x);
    addIfMaximal(e.top, coords.y);
  }
  private static void addMinToExtremes(extremes e, coords2 coords) {
    addIfMinimal(e.left, coords.x);
    addIfMinimal(e.bottom, coords.y);
  }

  private extremes cachedExtremes = null;

  // Once frozen, getMutable returns a new object based on this one, which can
  // be modified.
  freezableBounds getMutable() {
    assert(frozen);
    var f = new freezableBounds;
    f.links.push(this);
    return f;
  }

  freezableBounds transformed(transform t) {
    // Freeze these bounds, as we are storing a reference to them.
    freeze();

    var tlink = new transformedBounds;
    tlink.t = t;
    tlink.link = this;

    var b = new freezableBounds;
    b.tlinks.push(tlink);

    return b;
  }

  void append(freezableBounds b) {
    // Check that we can modify the object.
    assert(!frozen);

    //TODO: If b is "small", ie. a single tlink or cliplink, just copy the
    //link.

    // As we only reference b, we must freeze it to ensure it does not change.
    b.freeze();
    links.push(b);
  }

  void addPoint(pair user, pair truesize) {
    assert(!frozen);
    point.push(user, truesize);
  }

  void addBox(pair userMin, pair userMax, pair trueMin, pair trueMax) {
    assert(!frozen);
    this.min.push(userMin, trueMin);
    this.max.push(userMax, trueMax);
  }

  void addPath(path g) {
    // This, and other asserts have been removed to speed things up slightly.
    //assert(!frozen);
    this.pathBounds.push(g);
  }

  void addPath(path[] g) {
    //assert(!frozen);
    this.pathBounds.append(g);
  }

  // To squeeze out a bit more performance, this method is either assigned
  // addPathToNonEmptyArray or addPathToEmptyArray depending on the state of
  // the pathpenBounds array.
  void addPath(path g, pen p);

  private void addPathToNonEmptyArray(path g, pen p) {
    //assert(!frozen);
    //assert(!pathpenBounds.empty());
    var pp = pathpenBounds[0];

    // Test if the pens are equal or have the same bounds.
    if (pp.p == p || (min(pp.p) == min(p) && max(pp.p) == max(p))) {
      // If this path has the same pen as the last one, just add it to the
      // array corresponding to that pen.
      pp.g.push(g);
    }
    else {
      // A different pen.  Start a new bound and put it on the front.  Put
      // the old bound at the end of the array.
      pathpenBounds[0] = pathpen(g,p);
      pathpenBounds.push(pp);
    }
  }
  void addPathToEmptyArray(path g, pen p) {
    //assert(!frozen);
    //assert(pathpenBounds.empty());

    pathpenBounds.push(pathpen(g,p));
    addPath = addPathToNonEmptyArray;
  }

  // Initial setting for addPath.
  addPath = addPathToEmptyArray;

  // Transform the sizing info by t then add the result to the coords
  // structure.
  private void accumulateCoords(transform t, coords2 coords) {
    for (var link : links)
      link.accumulateCoords(t, coords);

    for (var tlink : tlinks)
      tlink.link.accumulateCoords(t*tlink.t, coords);

    addTransformedCoords(coords, t, this.point, this.min, this.max);

    for (var g : pathBounds) {
      g = t*g;
      coords.push(min(g), (0,0));
      coords.push(max(g), (0,0));
    }

    for (var pp: pathpenBounds) {
      pair pm = min(pp.p), pM = max(pp.p);
      for (var g : pp.g) {
        g = t*g;
        coords.push(min(g), pm);
        coords.push(max(g), pM);
      }
    }
  }

  // Add all of the sizing info to the given coords structure.
  private void accumulateCoords(coords2 coords) {
    for (var link : links)
      link.accumulateCoords(coords);

    for (var tlink : tlinks)
      tlink.link.accumulateCoords(tlink.t, coords);

    coords.append(this.point);
    coords.append(this.min);
    coords.append(this.max);

    for (var g : pathBounds) {
      coords.push(min(g), (0,0));
      coords.push(max(g), (0,0));
    }

    for (var pp: pathpenBounds) {
      pair pm = min(pp.p), pM = max(pp.p);
      for (var g : pp.g) {
        coords.push(min(g), pm);
        coords.push(max(g), pM);
      }
    }
  }

  // Returns all of the coords that this sizing data represents.
  private coords2 allCoords() {
    coords2 coords;
    accumulateCoords(coords);
    return coords;
  }

  private void addLocalsToExtremes(transform t, extremes e) {
    coords2 coords;
    addTransformedCoords(coords, t, this.point, this.min, this.max);
    addMinToExtremes(e, coords);
    addMaxToExtremes(e, coords);

    if (pathBounds.length > 0) {
      addMinToExtremes(e, minAfterTransform(t, pathBounds), (0,0));
      addMaxToExtremes(e, maxAfterTransform(t, pathBounds), (0,0));
    }

    for (var pp : pathpenBounds) {
      if (pp.g.length > 0) {
        addMinToExtremes(e, minAfterTransform(t, pp.g), min(pp.p));
        addMaxToExtremes(e, maxAfterTransform(t, pp.g), max(pp.p));
      }
    }
  }

  private void addToExtremes(transform t, extremes e) {
    for (var link : links)
      link.addToExtremes(t, e);

    for (var tlink : tlinks)
      tlink.link.addToExtremes(t*tlink.t, e);

    addLocalsToExtremes(t, e);
  }

  private void addLocalsToExtremes(extremes e) {
    addMinToExtremes(e, point);
    addMaxToExtremes(e, point);
    addMinToExtremes(e, min);
    addMaxToExtremes(e, max);

    if (pathBounds.length > 0) {
      addMinToExtremes(e, min(pathBounds), (0,0));
      addMaxToExtremes(e, max(pathBounds), (0,0));
    }

    for(var pp : pathpenBounds) {
      pair m=min(pp.p);
      pair M=max(pp.p);
      for(path gg : pp.g) {
        if (size(gg) > 0) {
          addMinToExtremes(e,min(gg),m);
          addMaxToExtremes(e,max(gg),M);
        }
      }
    }
  }

  private void addToExtremes(extremes e) {
    for (var link : links)
      link.addToExtremes(e);

    for (var tlink : tlinks)
      tlink.link.addToExtremes(tlink.t, e);

    addLocalsToExtremes(e);
  }

  private static void write(extremes e) {
    static void write(coord[] coords) {
      for (coord c : coords)
        write("  " + (string)c.user + " u + " + (string)c.truesize);
    }
    write("left:");
    write(e.left);
    write("bottom:");
    write(e.bottom);
    write("right:");
    write(e.right);
    write("top:");
    write(e.top);
  }

  // Returns the extremal coordinates of the sizing data.
  public extremes extremes() {
    if (cachedExtremes == null) {
      freeze();

      extremes e;
      addToExtremes(e);
      cachedExtremes = e;
    }

    return cachedExtremes;
  }

  // Helper functions for computing the usersize bounds.  usermin and usermax
  // would be easily computable from extremes, except that the picture
  // interface actually allows calls that manually change the usermin and
  // usermax values.  Therefore, we have to compute these values separately.
  private static struct userbounds {
    bool areSet=false;
    pair min;
    pair max;
  }
  private static struct boundsAccumulator {
    pair[] mins;
    pair[] maxs;

    void push(pair m, pair M) {
      mins.push(m);
      maxs.push(M);
    }

    void push(userbounds b) {
      if (b.areSet)
        push(b.min, b.max);
    }

    void push(transform t, userbounds b) {
      if (b.areSet) {
        pair[] box = { t*(b.min.x,b.max.y), t*b.max,
                       t*b.min,             t*(b.max.x,b.min.y) };
        for (var z : box)
          push(z,z);
      }
    }

    void pushUserCoords(coords2 min, coords2 max) {
      int n = min.x.length;
      assert(min.y.length == n);
      assert(max.x.length == n);
      assert(max.y.length == n);

      for (int i = 0; i < n; ++i)
        push((min.x[i].user, min.y[i].user),
             (max.x[i].user, max.y[i].user));
    }

    userbounds collapse() {
      userbounds b;
      if (mins.length > 0) {
        b.areSet = true;
        b.min = minbound(mins);
        b.max = maxbound(maxs);
      }
      else {
        b.areSet = false;
      }
      return b;
    }
  }

  // The user bounds already calculated for this data.
  private userbounds storedUserBounds = null;

  private void accumulateUserBounds(boundsAccumulator acc)
  {
    if (storedUserBounds != null) {
      assert(frozen);
      acc.push(storedUserBounds);
    } else {
      acc.pushUserCoords(point, point);
      acc.pushUserCoords(min, max);
      if (pathBounds.length > 0)
        acc.push(min(pathBounds), max(pathBounds));
      for (var pp : pathpenBounds)
        if(size(pp.g) > 0)
          acc.push(min(pp.g), max(pp.g));
      for (var link : links)
        link.accumulateUserBounds(acc);

      // Transforms are handled as they were in the old system.
      for (var tlink : tlinks) {
        boundsAccumulator tacc;
        tlink.link.accumulateUserBounds(tacc);
        acc.push(tlink.t, tacc.collapse());
      }
    }
  }

  private void computeUserBounds() {
    freeze();
    boundsAccumulator acc;
    accumulateUserBounds(acc);
    storedUserBounds = acc.collapse();
  }

  private userbounds userBounds() {
    if (storedUserBounds == null)
      computeUserBounds();

    assert(storedUserBounds != null);
    return storedUserBounds;
  }

  // userMin/userMax returns the minimal/maximal userspace coordinate of the
  // sizing data.  As coordinates for objects such as labels can have
  // significant truesize dimensions, this userMin/userMax values may not
  // correspond closely to the end of the screen, and are of limited use.
  // userSetx and userSety determine if there is sizing data in order to even
  // have userMin/userMax defined.
  public bool userBoundsAreSet() {
    return userBounds().areSet;
  }

  public pair userMin() {
    return userBounds().min;
  }
  public pair userMax() {
    return userBounds().max;
  }

  // To override the true userMin and userMax bounds, first compute the
  // userBounds as they should be at this point, then change the values.
  public void alterUserBound(string which, real val) {
    // We are changing the bounds data, so it cannot be frozen yet.  After the
    // user bounds are set, however, the sizing data cannot change, so it will
    // be frozen.
    assert(!frozen);
    computeUserBounds();
    assert(frozen);

    var b = storedUserBounds;
    if (which == "minx")
      b.min = (val, b.min.y);
    else if (which == "miny")
      b.min = (b.min.x, val);
    else if (which == "maxx")
      b.max = (val, b.max.y);
    else {
      assert(which == "maxy");
      b.max = (b.max.x, val);
    }
  }

  // A temporary measure.  Stuffs all of the data from the links and paths
  // into the coords.
  private void flatten() {
    assert(!frozen);

    // First, compute the user bounds, taking into account any manual
    // alterations.
    computeUserBounds();

    // Calculate all coordinates.
    coords2 coords = allCoords();

    // Erase all the old data.
    point.erase();
    min.erase();
    max.erase();
    pathBounds.delete();
    pathpenBounds.delete();
    addPath = addPathToEmptyArray;
    links.delete();
    tlinks.delete();

    // Put all of the coordinates into point.
    point = coords;
  }

  void xclip(real Min, real Max) {
    assert(!frozen);
    flatten();
    point.xclip(Min,Max);
    min.xclip(Min,Max);
    max.xclip(Min,Max);

    // Cap the userBounds.
    userbounds b = storedUserBounds;
    b.min = (max(Min, b.min.x), b.min.y);
    b.max = (min(Max, b.max.x), b.max.y);
  }

  void yclip(real Min, real Max) {
    assert(!frozen);
    flatten();
    point.yclip(Min,Max);
    min.yclip(Min,Max);
    max.yclip(Min,Max);

    // Cap the userBounds.
    userbounds b = storedUserBounds;
    b.min = (b.min.x, max(Min, b.min.y));
    b.max = (b.max.x, min(Max, b.max.y));
  }

  // Calculate the min for the final frame, given the coordinate transform.
  pair min(transform t) {
    extremes e = extremes();
    if (e.left.length == 0)
      return 0;

    pair a=t*(1,1)-t*(0,0), b=t*(0,0);
    scaling xs=scaling.build(a.x,b.x);
    scaling ys=scaling.build(a.y,b.y);

    return (min(infinity, xs, e.left), min(infinity, ys, e.bottom));
  }

  // Calculate the max for the final frame, given the coordinate transform.
  pair max(transform t) {
    extremes e = extremes();
    if (e.right.length == 0)
      return 0;

    pair a=t*(1,1)-t*(0,0), b=t*(0,0);
    scaling xs=scaling.build(a.x,b.x);
    scaling ys=scaling.build(a.y,b.y);

    return (max(-infinity, xs, e.right), max(-infinity, ys, e.top));
  }

  // Returns the transform for turning user-space pairs into true-space pairs.
  transform scaling(real xsize, real ysize,
                    real xunitsize, real yunitsize,
                    bool keepAspect, bool warn) {
    if(xsize == 0 && xunitsize == 0 && ysize == 0 && yunitsize == 0)
      return identity();

    // Get the extremal coordinates.
    extremes e = extremes();

    real sx;
    if(xunitsize == 0) {
      if(xsize != 0) sx=calculateScaling("x",e.left,e.right,xsize,warn);
    } else sx=xunitsize;

    /* Possible alternative code :
       real sx = xunitsize != 0 ? xunitsize :
       xsize != 0     ? calculateScaling("x", Coords.x, xsize, warn) :
       0; */

    real sy;
    if(yunitsize == 0) {
      if(ysize != 0) sy=calculateScaling("y",e.bottom,e.top,ysize,warn);
    } else sy=yunitsize;

    if(sx == 0) {
      sx=sy;
      if(sx == 0)
        return identity();
    } else if(sy == 0) sy=sx;


    if(keepAspect && (xunitsize == 0 || yunitsize == 0))
      return scale(min(sx,sy));
    else
      return scale(sx,sy);
  }
}

struct bounds {
  private var base = new freezableBounds;

  // We should probably put this back into picture.
  bool exact = true;

  // Called just before modifying the sizing data.  It ensures base is
  // non-frozen.
  // Note that this is manually inlined for speed reasons in a couple often
  // called methods below.
  private void makeMutable() {
    if (base.frozen)
      base = base.getMutable();
    //assert(!base.frozen); // Disabled for speed reasons.
  }

  void erase() {
    // Just discard the old bounds.
    base = new freezableBounds;

    // We don't reset the 'exact' field, for backward compatibility.
  }

  bounds copy() {
    // Freeze the underlying bounds and make a shallow copy.
    base.freeze();

    var b = new bounds;
    b.base = this.base;
    b.exact = this.exact;
    return b;
  }

  bounds transformed(transform t) {
    var b = new bounds;
    b.base = base.transformed(t);
    b.exact = this.exact;
    return b;
  }

  void append(bounds b) {
    makeMutable();
    base.append(b.base);
  }

  void append(transform t, bounds b) {
    // makeMutable will be called by append.
    if (t == identity())
      append(b);
    else
      append(b.transformed(t));
  }

  void addPoint(pair user, pair truesize) {
    makeMutable();
    base.addPoint(user, truesize);
  }

  void addBox(pair userMin, pair userMax, pair trueMin, pair trueMax) {
    makeMutable();
    base.addBox(userMin, userMax, trueMin, trueMax);
  }

  void addPath(path g) {
    //makeMutable(); // Manually inlined here for speed reasons.
    if (base.frozen)
      base = base.getMutable();
    base.addPath(g);
  }

  void addPath(path[] g) {
    //makeMutable(); // Manually inlined here for speed reasons.
    if (base.frozen)
      base = base.getMutable();
    base.addPath(g);
  }

  void addPath(path g, pen p) {
    //makeMutable(); // Manually inlined here for speed reasons.
    if (base.frozen)
      base = base.getMutable();
    base.addPath(g, p);
  }

  public bool userBoundsAreSet() {
    return base.userBoundsAreSet();
  }
  public pair userMin() {
    return base.userMin();
  }
  public pair userMax() {
    return base.userMax();
  }
  public void alterUserBound(string which, real val) {
    makeMutable();
    base.alterUserBound(which, val);
  }

  void xclip(real Min, real Max) {
    makeMutable();
    base.xclip(Min,Max);
  }

  void yclip(real Min, real Max) {
    makeMutable();
    base.yclip(Min,Max);
  }

  void clip(pair Min, pair Max) {
    // TODO: If the user bounds have been manually altered, they may be
    // incorrect after the clip.
    xclip(Min.x,Max.x);
    yclip(Min.y,Max.y);
  }

  pair min(transform t) {
    return base.min(t);
  }

  pair max(transform t) {
    return base.max(t);
  }

  transform scaling(real xsize, real ysize,
                    real xunitsize, real yunitsize,
                    bool keepAspect, bool warn) {
    return base.scaling(xsize, ysize, xunitsize, yunitsize, keepAspect, warn);
  }
}

bounds operator *(transform t, bounds b) {
  return b.transformed(t);
}