Added gantt_today_date option.

AxisLog.php

@@ -1,6 +1,6 @@
 <?php
 /**
- * Copyright (C) 2013-2021 Graham Breach
+ * Copyright (C) 2013-2022 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
@@ -201,6 +201,9 @@ public function getGridSubdivisions($min_space, $min_unit, $start, $fixed)
   public function measureUnits($pos, $u)
   {
     $i = Coords::parseValue($pos);
+    if(!is_numeric($i['value']))
+      throw new \Exception("Unable to measure $u units from '{$i['value']}'");
+
     $start_pos = $this->position($i['value']);
     $end_pos = $this->position($i['value'] + $u);
     return $end_pos - $start_pos;

CHANGES.txt

@@ -1,3 +1,11 @@
+Version 3.14 (02/05/2022)
+------------
+- Added Gantt chart.
+- Added automatic graph height option.
+- Added support for best-fit lines on bar and line graphs.
+- Added support for using coordinates for legend position.
+- Added block_position_markers option.
+
 Version 3.13.1 (11/03/2022)
 --------------
 - Fixed deprecation warning messages displayed by PHP 8.1.

GanttChart.php

@@ -400,10 +400,19 @@ private function getDayShading()
    */
   protected function getToday()
   {
-    $today = new \DateTime();
+    $today = $t_i = null;
+    $when = $this->getOption('gantt_today_date');
+    if($when) {
+      $t_i = Graph::dateConvert($when);
+      if($t_i !== null)
+        $today = new \DateTime('@' . $t_i);
+    }
+    if($today === null) {
+      $today = new \DateTime();
+      $t_i = $today->format('U');
+    }
 
     // check that today is on the chart
-    $t_i = $today->format('U');
     $axis = $this->getAxis('x', null);
     $a_len = $axis->getLength();
     $start_time = $axis->value(0);

README.txt

@@ -1,5 +1,5 @@
-SVGGraph Library version 3.13.1
-===============================
+SVGGraph Library version 3.14
+=============================
 
 This library provides PHP classes and functions for easily creating SVG
 graphs from data. Version 3.0 of SVGGraph requires at least PHP 5.4 - if
@@ -122,7 +122,7 @@ At the moment these types of graph are supported by SVGGraph:
 There are also these graphs that are really hard to describe:
 
  FloatingBarGraph; HorizontalFloatingBarGraph; BubbleGraph;
- BoxAndWhiskerGraph; PopulationPyramid; CandlestickGraph.
+ BoxAndWhiskerGraph; PopulationPyramid; CandlestickGraph; GanttChart.
 
 Using SVGGraph
 ==============

StructuredDataItem.php

@@ -1,6 +1,6 @@
 <?php
 /**
- * Copyright (C) 2019 Graham Breach
+ * Copyright (C) 2019-2022 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

svggraph.ini

@@ -861,6 +861,7 @@ gantt_today_colour = 'red'
 gantt_today_opacity = 1
 gantt_today_width = 2
 gantt_today_dash = '3'
+gantt_today_date = null
 gantt_group_corner_width = 6
 gantt_group_corner_height = 6
 gantt_group_colour = 'fillColour/saturation(60%)/brightness(140%)'