Fixes horizontal line graphs
[imager-graph.git] / lib / Imager / Graph / Horizontal.pm
CommitLineData
f0b01a81 1package Imager::Graph::Horizontal;
2
3=head1 NAME
4
5 Imager::Graph::Horizontal - A super class for line/bar charts
6
7=cut
8
9use strict;
10use vars qw(@ISA);
11use Imager::Graph;
12@ISA = qw(Imager::Graph);
13
14use constant STARTING_MIN_VALUE => 99999;
15
16=over 4
17
18=item add_data_series(\@data, $series_name)
19
20Add a data series to the graph, of the default type.
21
22=cut
23
24sub add_data_series {
25 my $self = shift;
26 my $data_ref = shift;
27 my $series_name = shift;
28
29 my $series_type = $self->_get_default_series_type();
30 $self->_add_data_series($series_type, $data_ref, $series_name);
31
32 return;
33}
34
35=item add_column_data_series(\@data, $series_name)
36
37Add a column data series to the graph.
38
39=cut
40
41sub add_column_data_series {
42 my $self = shift;
43 my $data_ref = shift;
44 my $series_name = shift;
45
46 $self->_add_data_series('column', $data_ref, $series_name);
47
48 return;
49}
50
51=item add_line_data_series(\@data, $series_name)
52
53Add a line data series to the graph.
54
55=cut
56
57sub add_line_data_series {
58 my $self = shift;
59 my $data_ref = shift;
60 my $series_name = shift;
61
62 $self->_add_data_series('line', $data_ref, $series_name);
63
64 return;
65}
66
67=item set_column_padding($int)
68
69Sets the number of pixels that should go between columns of data.
70
71=cut
72
73sub set_column_padding {
74 $_[0]->{'custom_style'}->{'column_padding'} = $_[1];
75}
76
77=item set_negative_background($color)
78
79Sets the background color used below the x axis.
80
81=cut
82
83sub set_negative_background {
84 $_[0]->{'custom_style'}->{'negative_bg'} = $_[1];
85}
86
87=item draw()
88
89Draw the graph
90
91=cut
92
93sub draw {
94 my ($self, %opts) = @_;
95
96 if (!$self->_valid_input()) {
97 return;
98 }
99
100 $self->_style_setup(\%opts);
101
102 my $style = $self->{_style};
103
104 my $img = $self->_get_image()
105 or return;
106
107 my @image_box = ( 0, 0, $img->getwidth-1, $img->getheight-1 );
108 $self->_set_image_box(\@image_box);
109
110 my @chart_box = ( 0, 0, $img->getwidth-1, $img->getheight-1 );
111 $self->_draw_legend(\@chart_box);
112 if ($style->{title}{text}) {
113 $self->_draw_title($img, \@chart_box)
114 or return;
115 }
116
117 # Scale the graph box down to the widest graph that can cleanly hold the # of columns.
118 return unless $self->_get_data_range();
119 $self->_remove_tics_from_chart_box(\@chart_box);
120 my $column_count = $self->_get_column_count();
121
122 my $width = $self->_get_number('width');
123 my $height = $self->_get_number('height');
124
125 my $graph_width = $chart_box[2] - $chart_box[0];
126 my $graph_height = $chart_box[3] - $chart_box[1];
127
95289584 128 my $col_height = ($graph_height - 1) / $column_count;
129 if ($col_height > 1) {
130 $graph_height = int($col_height) * $column_count + 1;
131 }
132 else {
133 $graph_height = $col_height * $column_count + 1;
134 }
f0b01a81 135
136 my $tic_count = $self->_get_x_tics();
137 my $tic_distance = int(($graph_width -1) / ($tic_count - 1));
138 $graph_width = $tic_distance * ($tic_count - 1);
139
140 my $bottom = $chart_box[1];
141 my $left = $chart_box[0];
142
143 $self->{'_style'}{'graph_width'} = $graph_width;
144 $self->{'_style'}{'graph_height'} = $graph_height;
145
146 my @graph_box = ($left, $bottom, $left + $graph_width, $bottom + $graph_height);
147 $self->_set_graph_box(\@graph_box);
148
149 $img->box(
150 color => $self->_get_color('outline.line'),
151 xmin => $left,
152 xmax => $left+$graph_width,
153 ymin => $bottom,
154 ymax => $bottom+$graph_height,
155 );
156
157 $img->box(
158 color => $self->_get_color('bg'),
159 xmin => $left + 1,
160 xmax => $left+$graph_width - 1,
161 ymin => $bottom + 1,
162 ymax => $bottom+$graph_height-1 ,
163 filled => 1,
164 );
165
166 my $min_value = $self->_get_min_value();
167 my $max_value = $self->_get_max_value();
168 my $value_range = $max_value - $min_value;
169
170 my $zero_position;
171 if ($value_range) {
267997be 172 $zero_position = $left + $graph_width + (-1*$min_value / $value_range) * ($graph_width-1);
f0b01a81 173 }
174
175 if ($min_value < 0) {
176 $img->box(
177 color => $self->_get_color('negative_bg'),
178 xmin => $left+1,
179 xmax => $zero_position,
180 ymin => $bottom+1,
181 ymax => $bottom+$graph_height - 1,
182 filled => 1,
183 );
184 $img->line(
185 x1 => $zero_position,
186 y1 => $bottom,
187 x2 => $zero_position,
188 y2 => $bottom + $graph_height,
189 color => $self->_get_color('outline.line'),
190 );
191 }
192
193 if ($self->_get_data_series()->{'bar'}) {
194 $self->_draw_bars();
195 }
09bdc58c 196 if ($self->_get_data_series()->{'line'}) {
197 $self->_draw_lines();
198 }
f0b01a81 199
200 if ($self->_get_x_tics()) {
201 $self->_draw_x_tics();
202 }
203 if ($self->_get_labels()) {
204 $self->_draw_y_tics();
205 }
206
207 return $self->_get_image();
208}
209
210sub _get_data_range {
211 my $self = shift;
212
213 my $max_value = 0;
214 my $min_value = 0;
215 my $column_count = 0;
216
217 my ($b_min, $b_max, $b_cols) = $self->_get_bar_range();
09bdc58c 218 my ($l_min, $l_max, $l_cols) = $self->_get_line_range();
f0b01a81 219
09bdc58c 220 $min_value = $self->_min(STARTING_MIN_VALUE, $b_min, $l_min);
221 $max_value = $self->_max(0, $b_max, $l_max);
222 $column_count = $self->_max(0, $b_cols, $l_cols);
267997be 223
224 my $config_min = $self->_get_number('x_min');
225 my $config_max = $self->_get_number('x_max');
226
227 if (defined $config_max && $config_max < $max_value) {
228 $config_max = undef;
229 }
230 if (defined $config_min && $config_min > $min_value) {
231 $config_min = undef;
232 }
233
234 my $range_padding = $self->_get_number('range_padding');
235 if (defined $config_min) {
236 $min_value = $config_min;
237 }
238 else {
239 if ($min_value > 0) {
240 $min_value = 0;
241 }
242 if ($range_padding && $min_value < 0) {
243 my $difference = $min_value * $range_padding / 100;
244 if ($min_value < -1 && $difference > -1) {
245 $difference = -1;
246 }
247 $min_value += $difference;
248 }
249 }
250 if (defined $config_max) {
251 $max_value = $config_max;
252 }
253 else {
254 if ($range_padding && $max_value > 0) {
255 my $difference = $max_value * $range_padding / 100;
256 if ($max_value > 1 && $difference < 1) {
257 $difference = 1;
258 }
259 $max_value += $difference;
260 }
261 }
f0b01a81 262
263 if ($self->_get_number('automatic_axis')) {
264 # In case this was set via a style, and not by the api method
265 eval { require Chart::Math::Axis; };
266 if ($@) {
267 return $self->_error("Can't use automatic_axis - $@");
268 }
269
270 my $axis = Chart::Math::Axis->new();
271 $axis->include_zero();
272 $axis->add_data($min_value, $max_value);
273 $max_value = $axis->top;
274 $min_value = $axis->bottom;
275 my $ticks = $axis->ticks;
276 # The +1 is there because we have the bottom tick as well
277 $self->set_x_tics($ticks+1);
278 }
279
280 $self->_set_max_value($max_value);
281 $self->_set_min_value($min_value);
282 $self->_set_column_count($column_count);
283
284 return 1;
285}
286
287sub _min {
288 my $self = shift;
289 my $min = shift;
290
291 foreach my $value (@_) {
292 next unless defined $value;
293 if ($value < $min) { $min = $value; }
294 }
295 return $min;
296}
297
298sub _max {
299 my $self = shift;
300 my $min = shift;
301
302 foreach my $value (@_) {
303 next unless defined $value;
304 if ($value > $min) { $min = $value; }
305 }
306 return $min;
307}
308
09bdc58c 309sub _get_line_range {
310 my $self = shift;
311 my $series = $self->_get_data_series()->{'line'};
312 return (undef, undef, 0) unless $series;
313
314 my $max_value = 0;
315 my $min_value = STARTING_MIN_VALUE;
316 my $column_count = 0;
317
318 my @series = @{$series};
319 foreach my $series (@series) {
320 my @data = @{$series->{'data'}};
321
322 if (scalar @data > $column_count) {
323 $column_count = scalar @data;
324 }
325
326 foreach my $value (@data) {
327 if ($value > $max_value) { $max_value = $value; }
328 if ($value < $min_value) { $min_value = $value; }
329 }
330 }
331
332 return ($min_value, $max_value, $column_count);
333}
334
335
336
f0b01a81 337sub _get_bar_range {
338 my $self = shift;
339
340 my $series = $self->_get_data_series()->{'bar'};
341 return (undef, undef, 0) unless $series;
342
343 my $max_value = 0;
344 my $min_value = STARTING_MIN_VALUE;
345 my $column_count = 0;
346
347 my @series = @{$series};
348 foreach my $series (@series) {
349 my @data = @{$series->{'data'}};
350
351 foreach my $value (@data) {
352 $column_count++;
353 if ($value > $max_value) { $max_value = $value; }
354 if ($value < $min_value) { $min_value = $value; }
355 }
356 }
357
358 return ($min_value, $max_value, $column_count);
359}
360
361
362sub _draw_legend {
363 my $self = shift;
364 my $chart_box = shift;
365 my $style = $self->{'_style'};
366
367 my @labels;
368 my $img = $self->_get_image();
369 if (my $series = $self->_get_data_series()->{'bar'}) {
370 push @labels, map { $_->{'series_name'} } @$series;
371 }
372
373 if ($style->{features}{legend} && (scalar @labels)) {
374 $self->SUPER::_draw_legend($self->_get_image(), \@labels, $chart_box)
375 or return;
376 }
377 return;
378}
379
380sub _draw_flat_legend {
381 return 1;
382}
383
384sub _draw_lines {
385 my $self = shift;
386 my $style = $self->{'_style'};
387
388 my $img = $self->_get_image();
389
390 my $max_value = $self->_get_max_value();
391 my $min_value = $self->_get_min_value();
392 my $column_count = $self->_get_column_count();
393
394 my $value_range = $max_value - $min_value;
395
396 my $width = $self->_get_number('width');
397 my $height = $self->_get_number('height');
398
399 my $graph_width = $self->_get_number('graph_width');
400 my $graph_height = $self->_get_number('graph_height');
401
402 my $line_series = $self->_get_data_series()->{'line'};
403 my $series_counter = $self->_get_series_counter() || 0;
404
405 my $has_columns = (defined $self->_get_data_series()->{'column'} || $self->_get_data_series->{'stacked_column'}) ? 1 : 0;
406
09bdc58c 407 my $col_height = int($graph_height / $column_count) -1;
f0b01a81 408
409 my $graph_box = $self->_get_graph_box();
410 my $left = $graph_box->[0] + 1;
411 my $bottom = $graph_box->[1];
412
09bdc58c 413 my $zero_position = $left + $graph_width - (-1*$min_value / $value_range) * ($graph_width - 1);
f0b01a81 414
415 my $line_aa = $self->_get_number("lineaa");
416 foreach my $series (@$line_series) {
417 my @data = @{$series->{'data'}};
418 my $data_size = scalar @data;
419
420 my $interval;
421 if ($has_columns) {
09bdc58c 422 $interval = $graph_height / ($data_size);
f0b01a81 423 }
424 else {
09bdc58c 425 $interval = $graph_height / ($data_size - 1);
f0b01a81 426 }
427 my $color = $self->_data_color($series_counter);
428
429 # We need to add these last, otherwise the next line segment will overwrite half of the marker
430 my @marker_positions;
431 for (my $i = 0; $i < $data_size - 1; $i++) {
09bdc58c 432 my $y1 = $bottom + $i * $interval;
433 my $y2 = $bottom + ($i + 1) * $interval;
f0b01a81 434
09bdc58c 435 $y1 += $has_columns * $interval / 2;
436 $y2 += $has_columns * $interval / 2;
f0b01a81 437
09bdc58c 438 my $x1 = $left + ($value_range - $data[$i] + $min_value)/$value_range * $graph_width;
439 my $x2 = $left + ($value_range - $data[$i + 1] + $min_value)/$value_range * $graph_width;
f0b01a81 440
441 push @marker_positions, [$x1, $y1];
442 $img->line(x1 => $x1, y1 => $y1, x2 => $x2, y2 => $y2, aa => $line_aa, color => $color) || die $img->errstr;
443 }
444
f0b01a81 445
09bdc58c 446 my $y2 = $bottom + ($data_size - 1) * $interval;
447 $y2 += $has_columns * $interval / 2;
448
449 my $x2 = $left + ($value_range - $data[$data_size - 1] + $min_value)/$value_range * $graph_width;
f0b01a81 450
451 push @marker_positions, [$x2, $y2];
452 foreach my $position (@marker_positions) {
453 $self->_draw_line_marker($position->[0], $position->[1], $series_counter);
454 }
455 $series_counter++;
456 }
457
458 $self->_set_series_counter($series_counter);
459 return;
460}
461
462sub _line_marker {
463 my ($self, $index) = @_;
464
465 my $markers = $self->{'_style'}{'line_markers'};
466 if (!$markers) {
467 return;
468 }
469 my $marker = $markers->[$index % @$markers];
470
471 return $marker;
472}
473
474sub _draw_line_marker {
475 my $self = shift;
476 my ($x1, $y1, $series_counter) = @_;
477
478 my $img = $self->_get_image();
479
480 my $style = $self->_line_marker($series_counter);
481 return unless $style;
482
483 my $type = $style->{'shape'};
484 my $radius = $style->{'radius'};
485
486 my $line_aa = $self->_get_number("lineaa");
487 my $fill_aa = $self->_get_number("fill.aa");
488 if ($type eq 'circle') {
489 my @fill = $self->_data_fill($series_counter, [$x1 - $radius, $y1 - $radius, $x1 + $radius, $y1 + $radius]);
490 $img->circle(x => $x1, y => $y1, r => $radius, aa => $fill_aa, filled => 1, @fill);
491 }
492 elsif ($type eq 'square') {
493 my @fill = $self->_data_fill($series_counter, [$x1 - $radius, $y1 - $radius, $x1 + $radius, $y1 + $radius]);
494 $img->box(xmin => $x1 - $radius, ymin => $y1 - $radius, xmax => $x1 + $radius, ymax => $y1 + $radius, @fill);
495 }
496 elsif ($type eq 'diamond') {
497 # The gradient really doesn't work for diamond
498 my $color = $self->_data_color($series_counter);
499 $img->polygon(
500 points => [
501 [$x1 - $radius, $y1],
502 [$x1, $y1 + $radius],
503 [$x1 + $radius, $y1],
504 [$x1, $y1 - $radius],
505 ],
506 filled => 1, color => $color, aa => $fill_aa);
507 }
508 elsif ($type eq 'triangle') {
509 # The gradient really doesn't work for triangle
510 my $color = $self->_data_color($series_counter);
511 $img->polygon(
512 points => [
513 [$x1 - $radius, $y1 + $radius],
514 [$x1 + $radius, $y1 + $radius],
515 [$x1, $y1 - $radius],
516 ],
517 filled => 1, color => $color, aa => $fill_aa);
518
519 }
520 elsif ($type eq 'x') {
521 my $color = $self->_data_color($series_counter);
522 $img->line(x1 => $x1 - $radius, y1 => $y1 -$radius, x2 => $x1 + $radius, y2 => $y1+$radius, aa => $line_aa, color => $color) || die $img->errstr;
523 $img->line(x1 => $x1 + $radius, y1 => $y1 -$radius, x2 => $x1 - $radius, y2 => $y1+$radius, aa => $line_aa, color => $color) || die $img->errstr;
524 }
525 elsif ($type eq 'plus') {
526 my $color = $self->_data_color($series_counter);
527 $img->line(x1 => $x1, y1 => $y1 -$radius, x2 => $x1, y2 => $y1+$radius, aa => $line_aa, color => $color) || die $img->errstr;
528 $img->line(x1 => $x1 + $radius, y1 => $y1, x2 => $x1 - $radius, y2 => $y1, aa => $line_aa, color => $color) || die $img->errstr;
529 }
530}
531
532sub _draw_bars {
533 my $self = shift;
534 my $style = $self->{'_style'};
535
536 my $img = $self->_get_image();
537
538 my $max_value = $self->_get_max_value();
539 my $min_value = $self->_get_min_value();
540 my $column_count = $self->_get_column_count();
541
542 my $value_range = $max_value - $min_value;
543
544 my $width = $self->_get_number('width');
545 my $height = $self->_get_number('height');
546
547 my $graph_width = $self->_get_number('graph_width');
548 my $graph_height = $self->_get_number('graph_height');
549
550
551 my $graph_box = $self->_get_graph_box();
552 my $bottom = $graph_box->[1] + 1;
553 my $left = $graph_box->[0];
554
555 my $zero_position = int($left + (-1*$min_value / $value_range) * ($graph_width-1));
556
95289584 557 my $bar_height = $graph_height / $column_count;
f0b01a81 558
559 my $outline_color;
560 if ($style->{'features'}{'outline'}) {
561 $outline_color = $self->_get_color('outline.line');
562 }
563
564 my $series_counter = $self->_get_series_counter() || 0;
565 my $col_series = $self->_get_data_series()->{'bar'};
566 my $column_padding = $self->_get_number('column_padding') || 0;
567
568 # This tracks the series we're in relative to the starting series - this way colors stay accurate, but the columns don't start out too far to the right.
569 my $column_series = 0;
570
571 for (my $series_pos = 0; $series_pos < scalar @$col_series; $series_pos++) {
572 my $series = $col_series->[$series_pos];
573 my @data = @{$series->{'data'}};
574 my $data_size = scalar @data;
f0b01a81 575 for (my $i = 0; $i < $data_size; $i++) {
576
95289584 577 my $part1 = $bar_height * (scalar @$col_series * $i);
578 my $part2 = ($series_pos) * $bar_height;
579 my $y1 = int($bottom + $part1 + $part2);
f0b01a81 580
95289584 581 my $y2 = int($y1 + $bar_height - $column_padding)-1;
582 # Special case for when bar_height is less than 1.
583 if ($y2 < $y1) {
584 $y2 = $y1;
585 }
f0b01a81 586
587 my $x1 = int($left - ($min_value - $data[$i]) / $value_range * $graph_width);
588
589 my $color = $self->_data_color($series_counter);
590
f0b01a81 591 if ($data[$i] > 0) {
7422650e 592 my @fill = $self->_data_fill($series_counter, [$zero_position+1, $y1, $x1, $y2]);
593 $img->box(xmax => $x1, xmin => $zero_position+1, ymin => $y1, ymax => $y2, @fill);
f0b01a81 594 if ($style->{'features'}{'outline'}) {
595 $img->box(xmax => $x1, xmin => $zero_position, ymin => $y1, ymax => $y2, color => $outline_color);
596 }
597 }
598 elsif ($data[$i] == 0) {
599 }
600 else {
7422650e 601 my @fill = $self->_data_fill($series_counter, [$x1, $y1, $zero_position, $y2]);
602 $img->box(xmax => $zero_position , xmin => $x1, ymin => $y1, ymax => $y2, @fill);
f0b01a81 603 if ($style->{'features'}{'outline'}) {
604 $img->box(xmax => $zero_position, xmin => $x1, ymin => $y1, ymax => $y2, color => $outline_color);
605 }
606 }
607 }
608
609 $series_counter++;
610 $column_series++;
611 }
612 $self->_set_series_counter($series_counter);
613 return;
614}
615
616sub _add_data_series {
617 my $self = shift;
618 my $series_type = shift;
619 my $data_ref = shift;
620 my $series_name = shift;
621
622 my $graph_data = $self->{'graph_data'} || {};
623
624 my $series = $graph_data->{$series_type} || [];
625
626 push @$series, { data => $data_ref, series_name => $series_name };
627
628 $graph_data->{$series_type} = $series;
629
630 $self->{'graph_data'} = $graph_data;
631 return;
632}
633
634=over
635
636=item show_vertical_gridlines()
637
638Shows vertical gridlines at the y-tics.
639
640=cut
641
642sub show_vertical_gridlines {
643 $_[0]->{'custom_style'}->{'vertical_gridlines'} = 1;
644}
645
646=item use_automatic_axis()
647
648Automatically scale the Y axis, based on L<Chart::Math::Axis>. If Chart::Math::Axis isn't installed, this sets an error and returns undef. Returns 1 if it is installed.
649
650=cut
651
652sub use_automatic_axis {
653 eval { require Chart::Math::Axis; };
654 if ($@) {
655 return $_[0]->_error("use_automatic_axis - $@\nCalled from ".join(' ', caller)."\n");
656 }
657 $_[0]->{'custom_style'}->{'automatic_axis'} = 1;
658 return 1;
659}
660
661
662=item set_x_tics($count)
663
664Set the number of X tics to use. Their value and position will be determined by the data range.
665
666=cut
667
668sub set_x_tics {
669 $_[0]->{'x_tics'} = $_[1];
670}
671
672sub _get_x_tics {
673 return $_[0]->{'x_tics'} || 0;
674}
675
676sub _remove_tics_from_chart_box {
677 my $self = shift;
678 my $chart_box = shift;
679
680 # XXX - bad default
681 my $tic_width = $self->_get_y_tic_width() || 10;
682 my @y_tic_box = ($chart_box->[0], $chart_box->[1], $chart_box->[0] + $tic_width, $chart_box->[3]);
683
684 # XXX - bad default
685 my $tic_height = $self->_get_x_tic_height() || 10;
686 my @x_tic_box = ($chart_box->[0], $chart_box->[3] - $tic_height, $chart_box->[2], $chart_box->[3]);
687
688 $self->_remove_box($chart_box, \@y_tic_box);
689 $self->_remove_box($chart_box, \@x_tic_box);
690
691 # If there's no title, the y-tics will be part off-screen. Half of the x-tic height should be more than sufficient.
692 my @y_tic_tops = ($chart_box->[0], $chart_box->[1], $chart_box->[2], $chart_box->[1] + int($tic_height / 2));
693 $self->_remove_box($chart_box, \@y_tic_tops);
694
267997be 695 if (my @box = $self->_text_bbox($self->_get_max_value(), 'legend')) {
696 my @remove_box = ($chart_box->[2] - int($box[2] / 2) - 1,
697 $chart_box->[1],
698 $chart_box->[2],
699 $chart_box->[3]
700 );
701
702 $self->_remove_box($chart_box, \@remove_box);
703 }
704
705
f0b01a81 706}
707
708sub _get_y_tic_width {
709 my $self = shift;
710
711 my $labels = $self->_get_labels();
712 my $max_width = 0;
713 foreach my $label (@$labels) {
714 my @box = $self->_text_bbox($label, 'legend');
715 my $width = $box[2] + 5;
716 # For the tic itself...
717 $width += 10;
718 if ($width > $max_width) {
719 $max_width = $width;
720 }
721 }
722 return $max_width;
723}
724
725sub _get_x_tic_height {
726 my $self = shift;
727
728 my $min = $self->_get_min_value();
729 my $max = $self->_get_max_value();
730 my $tic_count = $self->_get_x_tics();
731
732 my $interval = ($max - $min) / ($tic_count - 1);
733
734 my %text_info = $self->_text_style('legend')
735 or return;
736
737 my $max_height = 0;
738 for my $count (0 .. $tic_count - 1) {
739 my $value = sprintf("%.2f", ($count*$interval)+$min);
740
741 my @box = $self->_text_bbox($value, 'legend');
742 my $height = $box[3] - $box[1];
743
744 # For the tic width
745 $height += 10;
746 if ($height > $max_height) {
747 $max_height = $height;
748 }
749 }
750
751
752 return $max_height;
753}
754
755sub _draw_y_tics {
756 my $self = shift;
757
758 my $img = $self->_get_image();
759 my $graph_box = $self->_get_graph_box();
760 my $image_box = $self->_get_image_box();
761
762 my $labels = $self->_get_labels();
763
764 my $tic_count = (scalar @$labels) - 1;
765
766 my $has_columns = defined $self->_get_data_series()->{'bar'};
767
768 # If we have columns, we want the x-ticks to show up in the middle of the column, not on the left edge
769 my $denominator = $tic_count;
770 if ($has_columns) {
771 $denominator ++;
772 }
773 my $tic_distance = ($graph_box->[3] - $graph_box->[1]) / ($denominator);
774 my %text_info = $self->_text_style('legend')
775 or return;
776
777 for my $count (0 .. $tic_count) {
778 my $label = $labels->[$count];
779
780 my $x1 = $graph_box->[0] - 5;
781 my $x2 = $graph_box->[0] + 5;
782
783 my $y1 = $graph_box->[1] + ($tic_distance * $count);
784
785 if ($has_columns) {
786 $y1 += $tic_distance / 2;
787 }
788
789 $img->line(x1 => $x1, x2 => $x2, y1 => $y1, y2 => $y1, aa => 1, color => '000000');
790
791 my @box = $self->_text_bbox($label, 'legend')
792 or return;
793
794 my $width = $box[2];
795 my $height = $box[3];
796
797 $img->string(%text_info,
798 x => ($x1 - ($width + 5)),
799 y => ($y1 + ($height / 2)),
800 text => $label
801 );
802
803 }
804
805}
806
807sub _draw_x_tics {
808 my $self = shift;
809
810 my $img = $self->_get_image();
811 my $graph_box = $self->_get_graph_box();
812 my $image_box = $self->_get_image_box();
813
814 my $tic_count = $self->_get_x_tics();
815 my $min = $self->_get_min_value();
816 my $max = $self->_get_max_value();
817 my $interval = ($max - $min) / ($tic_count - 1);
818
819 # If we have columns, we want the x-ticks to show up in the middle of the column, not on the left edge
820 my $tic_distance = ($graph_box->[2] - $graph_box->[0]) / ($tic_count -1);
821
822 my %text_info = $self->_text_style('legend')
823 or return;
824
825 my $show_gridlines = $self->_get_number('vertical_gridlines');
826 for my $count (0 .. $tic_count-1) {
827 my $x1 = $graph_box->[0] + ($tic_distance * $count);
828
829 my $y1 = $graph_box->[3] + 5;
830 my $y2 = $graph_box->[3] - 5;
831
832 my $value = ($count*$interval)+$min;
833
834 $img->line(x1 => $x1, x2 => $x1, y1 => $y1, y2 => $y2, aa => 1, color => '000000');
835
836 my @box = $self->_text_bbox($value, 'legend')
837 or return;
838
839 my $width = $box[2];
840 my $height = $box[3];
841
842 $img->string(%text_info,
843 x => ($x1 - ($width / 2)),
844 y => ($y1 + $height + 5),
845 text => $value
846 );
847
848 if ($show_gridlines) {
849 # XXX - line styles!
850 for (my $i = $graph_box->[1]; $i < $graph_box->[3]; $i += 6) {
851 my $y1 = $i;
852 my $y2 = $i + 2;
853 if ($y2 > $graph_box->[3]) { $y2 = $graph_box->[3]; }
854 $img->line(x1 => $x1, x2 => $x1, y1 => $y1, y2 => $y2, aa => 1, color => '000000');
855 }
856 }
857 }
858}
859
860sub _valid_input {
861 my $self = shift;
862
863 if (!defined $self->_get_data_series() || !keys %{$self->_get_data_series()}) {
864 return $self->_error("No data supplied");
865 }
866
867 my $data = $self->_get_data_series();
868 if (defined $data->{'line'} && !scalar @{$data->{'line'}->[0]->{'data'}}) {
869 return $self->_error("No values in data series");
870 }
871 if (defined $data->{'column'} && !scalar @{$data->{'column'}->[0]->{'data'}}) {
872 return $self->_error("No values in data series");
873 }
874 if (defined $data->{'stacked_column'} && !scalar @{$data->{'stacked_column'}->[0]->{'data'}}) {
875 return $self->_error("No values in data series");
876 }
877
878 return 1;
879}
880
881sub _set_column_count { $_[0]->{'column_count'} = $_[1]; }
882sub _set_min_value { $_[0]->{'min_value'} = $_[1]; }
883sub _set_max_value { $_[0]->{'max_value'} = $_[1]; }
884sub _set_image_box { $_[0]->{'image_box'} = $_[1]; }
885sub _set_graph_box { $_[0]->{'graph_box'} = $_[1]; }
886sub _set_series_counter { $_[0]->{'series_counter'} = $_[1]; }
887sub _get_column_count { return $_[0]->{'column_count'} }
888sub _get_min_value { return $_[0]->{'min_value'} }
889sub _get_max_value { return $_[0]->{'max_value'} }
890sub _get_image_box { return $_[0]->{'image_box'} }
891sub _get_graph_box { return $_[0]->{'graph_box'} }
892sub _get_series_counter { return $_[0]->{'series_counter'} }
893
8941;
895