This file is indexed.

/usr/share/perl5/Chart/Split.pm is in libchart-perl 2.4.6-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  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
## @file
# Implementation of Chart::Split
#
# written and maintained by the
# @author Chart Group at Geodetic Fundamental Station Wettzell (Chart@fs.wettzell.de)
# @date 2012-10-03
# @version 2.4.6
#

## @class Chart::Split
#Split class derived from class Base.
#
# This class provides all functions which are specific to
# splitted plots
#
package Chart::Split;

use Chart::Base '2.4.6';
use GD;
use Carp;
use strict;

@Chart::Split::ISA     = qw(Chart::Base);
$Chart::Split::VERSION = '2.4.6';

#>>>>>>>>>>>>>>>>>>>>>>>>>>#
#  public methods go here  #
#<<<<<<<<<<<<<<<<<<<<<<<<<<#

#>>>>>>>>>>>>>>>>>>>>>>>>>>>#
#  private methods go here  #
#<<<<<<<<<<<<<<<<<<<<<<<<<<<#

## @fn private _draw_x_number_ticks
#draw the ticks
sub _draw_x_number_ticks
{
    my $self       = shift;
    my $data       = $self->{'dataref'};
    my $font       = $self->{'tick_label_font'};
    my $textcolor  = $self->_color_role_to_index('text');
    my $misccolor  = $self->_color_role_to_index('misc');
    my $num_points = $self->{'num_datapoints'};
    my ( $h, $w, $width, $step, $start, $interval, $label, $stag, @labels );
    my ( $x_start, $y_start, $y, $x, $lines, $delta, $ticks );
    my $x_label_len = 1;
    my $y_label_len = 1;
    my $x_max       = -0x80000000;

    $self->{'grid_data'}->{'x'} = [];

    # find the width
    $width = $self->{'curr_x_max'} - $self->{'curr_x_min'};
    $width = 1 if $width == 0;

    # make sure we got a real font
    unless ( ( ref $font ) eq 'GD::Font' )
    {
        croak "The tick label font you specified isn\'t a GD Font object";
    }

    # find out how big the font is
    ( $w, $h ) = ( $font->width, $font->height );

    unless ( defined $self->{'start'} && defined $self->{'interval'} )
    {
        croak "I need two values from you to draw a split chart: start and interval!";
    }
    else
    {
        $interval = $self->{'interval'};
        $start    = $self->{'start'};
        $ticks    = $self->{'interval_ticks'} - 1;
        $label    = $start;
    }

    #look after devision by zero!
    if ( $ticks == 0 ) { $ticks = 1; }

    #calculate the step between the ticks
    $step = $interval / $ticks;

    for ( 0 .. $ticks )
    {
        push @labels, $self->{f_x_tick}->( sprintf( "%." . $self->{'precision'} . "f", $label ) );
        $label += $step;
    }

    #find the biggest x value
    foreach ( @{ $data->[0] } )
    {
        if ( $_ > $x_max )
        {
            $x_max = $_;
        }
    }

    #find the length of the x and y labels
    foreach (@labels)
    {
        if ( length($_) > $x_label_len )
        {
            $x_label_len = length($_);
        }
    }

    #find the amount of lines
    $lines = int( ( ( $x_max - $start ) / $interval ) + 0.99999999999 );
    $lines = 1 if $lines == 0;

    #find the length, of the label.
    $y_label_len = length($lines);

    #get the starting point and the width
    if ( $lines > 1 )
    {    #if there are y-ticks
        if ( $self->{'y_axes'} =~ /^right$/i )
        {
            $x_start = $self->{'curr_x_min'};
            $width   = $self->{'curr_x_max'} - $x_start - $self->{'text_space'} * 2 - $y_label_len * $w - $self->{'tick_len'};

        }
        elsif ( $self->{'y_axes'} =~ /^both$/i )
        {
            $x_start = $self->{'curr_x_min'} + ( $w * $y_label_len ) + 2 * $self->{'text_space'} + $self->{'tick_len'};
            $width = $self->{'curr_x_max'} - $x_start - ( $w * $y_label_len ) - 2 * $self->{'text_space'} - $self->{'tick_len'};
        }
        else
        {
            $x_start = $self->{'curr_x_min'} + ( $w * $y_label_len ) + 3 * $self->{'text_space'};
            $width = $self->{'curr_x_max'} - $x_start;
        }
    }
    else
    {    #if there are no y-axes
        $x_start = $self->{'curr_x_min'};
        $width   = $self->{'curr_x_max'} - $x_start;
    }

    #and the y_start value
    $y_start = $self->{'curr_y_max'} - $h - $self->{'text_space'};

    #get the delta value
    $delta = $width / ($ticks);

    if ( !defined( $self->{'skip_x_ticks'} ) )
    {
        $self->{'skip_x_ticks'} = 1;
    }

    #draw the labels
    if ( $self->{'x_ticks'} =~ /^normal$/i )
    {
        if ( $self->{'skip_x_ticks'} > 1 )
        {    #draw a normal tick every nth label
            for ( 0 .. $#labels - 1 )
            {
                if ( defined( $labels[ $_ * $self->{'skip_x_ticks'} ] ) )
                {
                    $x =
                      $x_start +
                      $delta * ( $_ * $self->{'skip_x_ticks'} ) -
                      ( $w * length( $labels[ $_ * $self->{'skip_x_ticks'} ] ) ) / 2;
                    $self->{'gd_obj'}->string( $font, $x, $y_start, $labels[ $_ * $self->{'skip_x_ticks'} ], $textcolor );
                }
            }
        }
        elsif ( $self->{'custom_x_ticks'} )
        {    #draw only the normal ticks they wanted
            foreach ( @{ $self->{'custom_x_ticks'} } )
            {
                if ( defined $labels[$_] )
                {
                    $x = $x_start + $delta * $_ - ( $w * length( $labels[$_] ) ) / 2;
                    $self->{'gd_obj'}->string( $font, $x, $y_start, $labels[$_], $textcolor );
                }
            }
        }
        else
        {
            for ( 0 .. $#labels )
            {    #draw all ticks normal
                if ( defined $labels[$_] )
                {
                    $x = $x_start + $delta * ($_) - ( $w * length( $labels[$_] ) ) / 2;
                    $self->{'gd_obj'}->string( $font, $x, $y_start, $labels[$_], $textcolor );
                }
            }
        }
    }
    elsif ( $self->{'x_ticks'} =~ /^staggered$/i )
    {
        $stag = 0;
        if ( $self->{'skip_x_ticks'} > 1 )
        {    #draw a staggered tick every nth label
            for ( 0 .. $#labels - 1 )
            {
                if ( defined( $labels[ $_ * $self->{'skip_x_ticks'} ] ) )
                {
                    $x =
                      $x_start +
                      $delta * ( $_ * $self->{'skip_x_ticks'} ) -
                      ( $w * length( $labels[ $_ * $self->{'skip_x_ticks'} ] ) ) / 2;
                    if ( $stag % 2 == 0 )
                    {
                        $y_start -= $self->{'text_space'} + $h;
                    }
                    $self->{'gd_obj'}->string( $font, $x, $y_start, $labels[ $_ * $self->{'skip_x_ticks'} ], $textcolor );
                    if ( $stag % 2 == 0 )
                    {
                        $y_start += $self->{'text_space'} + $h;
                    }
                    $stag++;
                }
            }
        }
        elsif ( $self->{'custom_x_ticks'} )
        {    # draw only the wanted ticks staggered
            foreach ( sort ( @{ $self->{'custom_x_ticks'} } ) )
            {
                if ( defined $labels[$_] )
                {
                    $x = $x_start + $delta * $_ - ( $w * ( length( $labels[$_] ) ) ) / 2;
                    if ( $stag % 2 == 0 )
                    {
                        $y_start -= $self->{'text_space'} + $h;
                    }
                    $self->{'gd_obj'}->string( $font, $x, $y_start, $labels[$_], $textcolor );
                    if ( $stag % 2 == 0 )
                    {
                        $y_start += $self->{'text_space'} + $h;
                    }
                    $stag++;
                }
            }
        }
        else
        {    # draw all ticks staggered
            for ( 0 .. $#labels )
            {
                if ( defined $labels[$_] )
                {
                    $x = $x_start + $delta * $_ - ( $w * ( length( $labels[$_] ) ) ) / 2;
                    if ( $stag % 2 == 0 )
                    {
                        $y_start -= $self->{'text_space'} + $h;
                    }
                    $self->{'gd_obj'}->string( $font, $x, $y_start, $labels[$_], $textcolor );
                    if ( $stag % 2 == 0 )
                    {
                        $y_start += $self->{'text_space'} + $h;
                    }
                    $stag++;
                }
            }
        }
    }
    elsif ( $self->{'x_ticks'} =~ /^vertical$/i )
    {
        $y_start = $self->{'curr_y_max'} - $self->{'text_space'};
        if ( $self->{'skip_x_ticks'} > 1 )
        {    #draw every nth tick vertical
            for ( 0 .. $#labels )
            {
                if ( defined $_ )
                {
                    $x = $x_start + $delta * ( $_ * $self->{'skip_x_ticks'} ) - $h / 2;
                    $y = $y_start - ( $x_label_len - length( $labels[ $_ * $self->{'skip_x_ticks'} ] ) ) * $w;
                    $self->{'gd_obj'}->stringUp( $font, $x, $y, $labels[ $_ * $self->{'skip_x_ticks'} ], $textcolor );
                }
            }
        }
        elsif ( $self->{'custom_x_ticks'} )
        {
            foreach ( @{ $self->{'custom_x_ticks'} } )
            {    #draw the ticks they want vertical
                if ( defined $labels[$_] )
                {
                    $x = $x_start + $delta * $_ - $h / 2;
                    $y = $y_start - ( $x_label_len - length( $labels[$_] ) ) * $w;
                    $self->{'gd_obj'}->stringUp( $font, $x, $y, $labels[$_], $textcolor );
                }
            }
        }
        else
        {        # draw all ticks vertical
            for ( 0 .. $#labels )
            {
                if ( defined $labels[$_] )
                {
                    $x = $x_start + $delta * $_ - $h / 2;
                    $y = $y_start - ( $x_label_len - length( $labels[$_] ) ) * $w;
                    $self->{'gd_obj'}->stringUp( $font, $x, $y, $labels[$_], $textcolor );
                }
            }
        }

    }

    #update the borders
    if ( $self->{'interval_ticks'} > 0 )
    {
        if ( $self->{'x_ticks'} =~ /^normal$/i )
        {
            $self->{'curr_y_max'} -= $h + $self->{'text_space'} * 2;
        }
        elsif ( $self->{'x_ticks'} =~ /^staggered$/i )
        {
            $self->{'curr_y_max'} -= 2 * $h + 3 * $self->{'text_space'};
        }
        elsif ( $self->{'x_ticks'} =~ /^vertical$/i )
        {
            $self->{'curr_y_max'} -= $w * $x_label_len + $self->{'text_space'} * 2;
        }
    }

    #draw the ticks
    $y_start = $self->{'curr_y_max'};
    $y       = $y_start - $self->{'tick_len'};

    if ( $self->{'skip_x_ticks'} > 1 )
    {
        for ( 0 .. int( ($#labels) / $self->{'skip_x_ticks'} ) )
        {
            $x = $x_start + $delta * ( $_ * $self->{'skip_x_ticks'} );
            $self->{'gd_obj'}->line( $x, $y_start, $x, $y, $misccolor );
            if (   $self->true( $self->{'grid_lines'} )
                or $self->true( $self->{'x_grid_lines'} ) )
            {
                $self->{'grid_data'}->{'x'}->[$_] = $x;
            }
        }
    }
    elsif ( $self->{'custom_x_ticks'} )
    {
        foreach ( @{ $self->{'custom_x_ticks'} } )
        {
            if ( $_ <= $ticks )
            {
                $x = $x_start + $delta * $_;
                $self->{'gd_obj'}->line( $x, $y_start, $x, $y, $misccolor );
                if (   $self->true( $self->{'grid_lines'} )
                    or $self->true( $self->{'x_grid_lines'} ) )
                {
                    $self->{'grid_data'}->{'x'}->[$_] = $x;
                }
            }
        }
    }
    else
    {
        for ( 0 .. $#labels )
        {
            $x = $x_start + $_ * $delta;
            $self->{'gd_obj'}->line( $x, $y_start, $x, $y, $misccolor );
            if (   $self->true( $self->{'grid_lines'} )
                or $self->true( $self->{'x_grid_lines'} ) )
            {
                $self->{'grid_data'}->{'x'}->[$_] = $x;
            }
        }
    }

    #another update of the borders
    $self->{'curr_y_max'} -= $self->{'tick_len'} if $self->{'interval_ticks'} > 0;

    #finally return
    return;
}

## @fn private _draw_x_ticks
# override the function implemented in base
sub _draw_x_ticks
{
    my $self = shift;

    #Use always the _draw_x_tick funktion because we always do a xy_plot!!!
    $self->_draw_x_number_ticks();

    #and return
    return 1;
}

## @fn private _draw_y_ticks
# override the function implemented in base
sub _draw_y_ticks
{
    my $self       = shift;
    my $side       = shift || 'left';
    my $data       = $self->{'dataref'};
    my $font       = $self->{'tick_label_font'};
    my $textcolor  = $self->_color_role_to_index('text');
    my $misccolor  = $self->_color_role_to_index('misc');
    my @labels     = @{ $self->{'y_tick_labels'} };
    my $num_points = $self->{'num_datapoints'};
    my ( $w, $h );
    my ( $x_start, $x, $y_start, $y, $start, $interval );
    my ( $height, $delta, $label, $lines, $label_len );
    my ( $s, $f );
    my $x_max = -0x80000000;
    $self->{grid_data}->{'y'}  = [];
    $self->{grid_data}->{'y2'} = [];

    # find the height
    $height = $self->{'curr_y_max'} - $self->{'curr_y_min'};

    # make sure we got a real font
    unless ( ( ref $font ) eq 'GD::Font' )
    {
        croak "The tick label font you specified isn\'t a GD Font object";
    }

    # find out how big the font is
    ( $w, $h ) = ( $font->width, $font->height );

    #get the base variables
    $interval = $self->{'interval'};
    $start    = $self->{'start'};

    #find the biggest x value
    foreach ( @{ $data->[0] } )
    {
        if ( $_ > $x_max )
        {
            $x_max = $_;
        }
    }

    #calculate the number of lines and the length
    $lines = int( ( ( $x_max - $start ) / $interval ) + 0.99999999999 );
    $lines = 1 if $lines == 0;
    $label_len = length($lines);

    #get the space between two lines
    $delta = $height / $lines;

    #now draw them
    if ( $lines > 1 )
    {
        if ( $side =~ /^right$/i )
        {

            #get the starting point
            $x_start = $self->{'curr_x_max'};
            $y_start = $self->{'curr_y_min'};

            #draw the labels
            for $label ( 0 .. $lines - 1 )
            {
                $x = $x_start - $self->{'text_space'} - $label_len * $w;
                $y = $y_start + $label * $delta + $delta / 2 - $h / 2;
                $self->{'gd_obj'}->string( $font, $x, $y, $label, $textcolor );
            }

            #draw the ticks
            for $label ( 0 .. $lines )
            {
                $x = $x_start - $self->{'text_space'} * 2 - $label_len * $w - $self->{'tick_len'};
                $y = $y_start + $label * $delta;
                $self->{'gd_obj'}->line( $x_start - $self->{'text_space'}, $y, $x, $y, $misccolor );

                #add data for grid_lines
                push @{ $self->{grid_data}->{'y'} }, $y;
            }

            #update the borders
            $self->{'curr_x_max'} = $x_start - $self->{'text_space'} * 2 - $label_len * $w - $self->{'tick_len'};

        }

        elsif ( $side =~ /^both$/i )
        {

            #get the starting point
            $x_start = $self->{'curr_x_min'};
            $y_start = $self->{'curr_y_min'};

            #first the left side
            #draw the labels
            for $label ( 0 .. $lines - 1 )
            {
                $x = $self->{'curr_x_min'} + $self->{'text_space'} * 2;
                $y = $y_start + $label * $delta + $delta / 2 - $h / 2;
                $self->{'gd_obj'}->string( $font, $x, $y, $self->{'f_y_tick'}->($label), $textcolor );
            }

            #draw the ticks
            for $label ( 0 .. $lines )
            {
                $x = $x_start + $self->{'text_space'} * 2 + $label_len * $w + $self->{'tick_len'};
                $y = $y_start + $label * $delta;
                $self->{'gd_obj'}->line( $x_start + $self->{'text_space'}, $y, $x, $y, $misccolor );
            }

            #then the right side
            #get the starting point
            $x_start = $self->{'curr_x_max'};
            $y_start = $self->{'curr_y_min'};

            #draw the labels
            for $label ( 0 .. $lines - 1 )
            {
                $x = $x_start - $self->{'text_space'} - $label_len * $w;
                $y = $y_start + $label * $delta + $delta / 2 - $h / 2;
                $self->{'gd_obj'}->string( $font, $x, $y, $self->{'f_y_tick'}->($label), $textcolor );
            }

            #draw the ticks
            for $label ( 0 .. $lines )
            {
                $x = $x_start - $self->{'text_space'} * 2 - $label_len * $w - $self->{'tick_len'};
                $y = $y_start + $label * $delta;
                $self->{'gd_obj'}->line( $x_start - $self->{'text_space'}, $y, $x, $y, $misccolor );

                #add data for grid_lines
                push @{ $self->{grid_data}->{'y'} }, $y;
            }

            #update the borders
            $self->{'curr_x_min'} += $self->{'text_space'} * 2 + $label_len * $w + $self->{'tick_len'};
            $self->{'curr_x_max'} = $x_start - $self->{'text_space'} * 2 - $label_len * $w - $self->{'tick_len'};

        }
        else
        {

            #get the starting point
            $x_start = $self->{'curr_x_min'};
            $y_start = $self->{'curr_y_min'};

            #draw the labels
            for $label ( 0 .. $lines - 1 )
            {
                $x = $self->{'curr_x_min'} + $self->{'text_space'} * 2;
                $y = $y_start + $label * $delta + $delta / 2 - $h / 2;
                $self->{'gd_obj'}->string( $font, $x, $y, $self->{'f_y_tick'}->($label), $textcolor );
            }

            #draw the ticks
            for $label ( 0 .. $lines )
            {
                $x = $x_start + $label_len * $w + $self->{'tick_len'} + $self->{'text_space'} * 3;
                $y = $y_start + $label * $delta;
                $self->{'gd_obj'}->line( $x_start + $self->{'text_space'}, $y, $x, $y, $misccolor );

                #this is also where we have to draw the grid_lines
                push @{ $self->{grid_data}->{'y'} }, $y;
            }

            #update the borders
            $self->{'curr_x_min'} = $x_start + $self->{'text_space'} * 3 + $label_len * $w;
        }

    }

    #finally return
    return 1;
}

## @fn private _draw_data
# plot the data
sub _draw_data
{
    my $self       = shift;
    my $data       = $self->{'dataref'};
    my $misccolor  = $self->_color_role_to_index('misc');
    my $num_points = $self->{'num_datapoints'};
    $num_points = 1 if $num_points == 0;
    my $num_sets = $self->{'num_datasets'};
    $num_sets = 1 if $num_sets == 0;
    my ( $lines,    $split,   $width,     $height, $delta_lines, $delta_sets, $map, $last_line );
    my ( $akt_line, $akt_set, $akt_point, $color,  $x_start,     $y_start,    $x,   $y );
    my ( $x_last, $y_last, $delta_point, $brush, $mod, $x_interval, $start );
    my $i        = 0;
    my $interval = ( $self->{'max_val'} - $self->{'min_val'} );
    $interval = 1 if $interval == 0;
    my $x_max = -0x80000000;

    # find the height and the width
    $width  = $self->{'curr_x_max'} - $self->{'curr_x_min'};
    $width  = 1 if $width == 0;
    $height = $self->{'curr_y_max'} - $self->{'curr_y_min'};
    $height = 1 if $height == 0;

    # init the imagemap data field if they asked for it
    if ( $self->true( $self->{'imagemap'} ) )
    {
        $self->{'imagemap_data'} = [];
    }

    #get the base values
    $x_interval = $self->{'interval'};
    $x_interval = 1 if $x_interval == 0;
    $start      = $self->{'start'};

    #find the biggest x value
    foreach ( @{ $data->[0] } )
    {
        if ( $_ > $x_max )
        {
            $x_max = $_;
        }
    }

    #calculate the number of lines
    $lines = int( ( ( $x_max - $start ) / $x_interval ) + 0.99999999999 );
    $lines = 1 if $lines == 0;

    #find delta_lines for the space between the lines
    #and delta_sets for the space of the datasets of one line
    #and the delta_point for the space between the datapoints
    $delta_lines = $height / $lines;
    $delta_sets  = $delta_lines / $num_sets;
    $delta_point = $width / ($x_interval);

    #find $map, for the y values
    $map = $delta_sets / $interval;

    #find the mod and the y_start value
    #correct the start value, if scale is set! Otherwise the plot is to high or to low!
    #The corecction, isn't perfect, but it does a good job in most cases.
    if ( $self->{'min_val'} >= 0 )
    {
        $mod = $self->{'min_val'};
        if ( $self->{'scale'} > 1 )
        {
            $y_start = $self->{'curr_y_min'} + ( $interval * $map / 2 ) * ( $self->{'scale'} - 1 );
        }
        else
        {
            $y_start = $self->{'curr_y_min'};
        }
    }
    elsif ( $self->{'max_val'} <= 0 )
    {
        $mod = $self->{'min_val'};
        if ( $self->{'scale'} > 1 )
        {
            $y_start = $self->{'curr_y_min'} + ( $interval * $map / 2 ) * ( $self->{'scale'} - 1 );
        }
        else
        {
            $y_start = $self->{'curr_y_min'};
        }
    }
    else
    {
        $y_start = $self->{'curr_y_min'} + ( $map * $self->{'min_val'} );
        $mod = 0;
    }

    #The upper right corner is the point, where we start
    $x_start = $self->{'curr_x_min'};

    #draw the lines
    for $akt_set ( 0 .. $num_sets - 1 )
    {
        for $akt_point ( 0 .. $self->{'num_datapoints'} - 1 )
        {

            #get the color for this dataset
            $color = $self->_color_role_to_index( 'dataset' . $akt_set );
            $brush = $self->_prepare_brush( $color, 'line' );
            $self->{'gd_obj'}->setBrush($brush);

            #start with the first point at line number zero
            $last_line = 0;
            for $akt_line ( $last_line .. $lines - 1 )
            {

                #update the last line. That makes it a little bit faster.
                $last_line = $akt_line;

                #Don't try to draw, if there is no data
                if ( defined $data->[0][$akt_point] )
                {
                    if (   $data->[0][$akt_point] <= ( ( $akt_line + 1 ) * $x_interval + $start )
                        && $data->[0][$akt_point] >= $akt_line * $x_interval + $start )
                    {

                        #the current point
                        $x = $x_start + ( $data->[0][$akt_point] - ( $akt_line * $x_interval ) - ($start) ) * $delta_point;
                        $y =
                          $y_start +
                          $akt_line * $delta_lines +
                          $akt_set * $delta_sets +
                          $delta_sets -
                          ( $data->[ 1 + $akt_set ][$akt_point] - $mod ) * $map * $self->{'scale'};

                        #draw the line
                        $self->{'gd_obj'}->line( $x_last, $y_last, $x, $y, gdBrushed ) if $akt_point != 0;

                        #calculate the start point for the next line
                        #first if the next point is in the same line
                        if (   defined( $data->[0][ $akt_point + 1 ] )
                            && $data->[0][ $akt_point + 1 ] <= ( ( $akt_line + 1 ) * $x_interval + $start )
                            && $data->[0][ $akt_point + 1 ] > $akt_line * $x_interval + $start )
                        {
                            $x_last = $x;
                            $y_last = $y;
                        }

                        #second, if the next point is not in the same line
                        else
                        {
                            $x_last = $self->{'curr_x_min'};
                            $y_last =
                              $y_start +
                              ( $akt_line + 1 ) * $delta_lines +
                              $akt_set * $delta_sets +
                              $delta_sets -
                              ( $data->[ 1 + $akt_set ][$akt_point] - $mod ) * $map * $self->{'scale'};
                        }

                        # store the imagemap data if they asked for it
                        if ( $self->true( $self->{'imagemap'} ) )
                        {
                            $self->{'imagemap_data'}->[$akt_set][ $akt_point - 1 ] = [ $x_last, $y_last ];
                            $self->{'imagemap_data'}->[$akt_set][$akt_point] = [ $x, $y ];
                        }
                    }
                    else
                    {    #Go to the next line. Maybe the current point is in that line!
                        next;
                    }
                }
                else
                {
                    if ( $self->true( $self->{'imagemap'} ) )
                    {
                        $self->{'imagemap_data'}->[$akt_set][ $akt_point - 1 ] = [ undef(), undef() ];
                        $self->{'imagemap_data'}->[$akt_set][$akt_point] = [ undef(), undef() ];
                    }
                }
            }
        }
    }

    $y_start = $self->{'curr_y_min'};

    #draw some nice little lines
    for $akt_set ( 0 .. $num_sets - 1 )
    {
        for $akt_line ( 0 .. $lines - 1 )
        {

            #draw a line between the sets at the left side of the chart
            $self->{'gd_obj'}->line(
                $x_start,
                $y_start + $akt_line * $delta_lines + $akt_set * $delta_sets,
                $x_start + $self->{'tick_len'},
                $y_start + $akt_line * $delta_lines + $akt_set * $delta_sets, $misccolor
            );

            #draw a line between the sets at the right side of the chart
            $self->{'gd_obj'}->line(
                $self->{'curr_x_max'},
                $y_start + $akt_line * $delta_lines + $akt_set * $delta_sets,
                $self->{'curr_x_max'} - $self->{'tick_len'},
                $y_start + $akt_line * $delta_lines + $akt_set * $delta_sets, $misccolor
            );
        }
    }

    #Box it off
    $self->{'gd_obj'}
      ->rectangle( $self->{'curr_x_min'}, $self->{'curr_y_min'}, $self->{'curr_x_max'}, $self->{'curr_y_max'}, $misccolor );

    #finally retrun
    return;
}

#be a good modul and return 1
1;