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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,143 @@ | ||
| <?php | ||
| /** | ||
| * Copyright (C) 2015 Graham Breach | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU Lesser General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU Lesser General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Lesser General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
| /** | ||
| * For more information, please contact <[email protected]> | ||
| */ | ||
|
|
||
| require_once 'SVGGraphBarGraph.php'; | ||
|
|
||
| class Histogram extends BarGraph { | ||
|
|
||
| protected $label_centre = FALSE; | ||
| protected $force_assoc = TRUE; | ||
| protected $minimum_units_y = 1; | ||
|
|
||
| protected $increment = NULL; | ||
| protected $percentage = false; | ||
|
|
||
|
|
||
| /** | ||
| * Process the values | ||
| */ | ||
| public function Values($values) | ||
| { | ||
| if(!empty($values)) { | ||
| parent::Values($values); | ||
| $values = array(); | ||
|
|
||
| // find min, max, strip out nulls | ||
| $min = $max = NULL; | ||
| foreach($this->values[0] as $item) { | ||
| if(!is_null($item->value)) { | ||
| if(is_null($min) || $item->value < $min) | ||
| $min = $item->value; | ||
| if(is_null($max) || $item->value > $max) | ||
| $max = $item->value; | ||
| $values[] = $item->value; | ||
| } | ||
| } | ||
|
|
||
| // calculate increment? | ||
| if($this->increment <= 0) { | ||
| $diff = $max - $min; | ||
| if($diff <= 0) { | ||
| $inc = 1; | ||
| } else { | ||
| $inc = pow(10, floor(log10($diff))); | ||
| $d1 = $diff / $inc; | ||
| if(($inc != 1 || !is_integer($diff)) && $d1 < 4) { | ||
| if($d1 < 3) | ||
| $inc *= 0.2; | ||
| else | ||
| $inc *= 0.5; | ||
| } | ||
| } | ||
| $this->increment = $inc; | ||
| } | ||
|
|
||
| // prefill the map with nulls | ||
| $map = array(); | ||
| $start = $this->Interval($min); | ||
| $end = $this->Interval($max, true) + $this->increment / 2; | ||
| for($i = $start; $i < $end; $i += $this->increment) { | ||
| $key = Graph::NumString($i); | ||
| $map[$key] = null; | ||
| } | ||
|
|
||
| foreach($values as $val) { | ||
| $k = Graph::NumString($this->Interval($val)); | ||
| if(!array_key_exists($k, $map)) | ||
| $map[$k] = 1; | ||
| else | ||
| $map[$k]++; | ||
| } | ||
|
|
||
| if($this->percentage) { | ||
| $total = count($values); | ||
| $pmap = array(); | ||
| foreach($map as $k => $v) | ||
| $pmap[$k] = 100 * $v / $total; | ||
| $values = $pmap; | ||
| } else { | ||
| $values = $map; | ||
| } | ||
|
|
||
| // turn off structured data | ||
| $this->structure = NULL; | ||
| $this->structured_data = FALSE; | ||
| } | ||
| parent::Values($values); | ||
| } | ||
|
|
||
| /** | ||
| * Returns the start (or next) interval for a value | ||
| */ | ||
| public function Interval($value, $next = false) | ||
| { | ||
| $n = floor($value / $this->increment); | ||
| if($next) | ||
| ++$n; | ||
| return $n * $this->increment; | ||
| } | ||
|
|
||
| /** | ||
| * Sets up the colour class with corrected number of colours | ||
| */ | ||
| protected function ColourSetup($count, $datasets = NULL) | ||
| { | ||
| // $count is off by 1 because the divisions are numbered | ||
| return parent::ColourSetup($count - 1, $datasets); | ||
| } | ||
|
|
||
| /** | ||
| * Override because of the shifted numbering | ||
| */ | ||
| protected function GridPosition($key, $ikey) | ||
| { | ||
| $position = null; | ||
| $zero = -0.01; // catch values close to 0 | ||
| $axis = $this->x_axes[$this->main_x_axis]; | ||
| $offset = $axis->Zero() + ($axis->Unit() * $ikey); | ||
| $g_limit = $this->g_width - ($axis->Unit() / 2); | ||
| if($offset >= $zero && floor($offset) <= $g_limit) | ||
| $position = $this->pad_left + $offset; | ||
|
|
||
| return $position; | ||
| } | ||
| } | ||
|
|
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