Description: ------------ When you have datasets with only one value no bar will show upp. I know it's kind of silly to have a graph with only one bar... but it's not my call. I've been trying to fix it and think I've come up with a solution. By changing the lines 705-707 in Axis.php from: if ($this->_axisValueSpan == 0) { $this->_delta = false; } elseif ($this->_type == IMAGE_GRAPH_AXIS_X) { to: /* if ($this->_axisValueSpan == 0) { $this->_delta = false; } elseif ($this->_type == IMAGE_GRAPH_AXIS_X) { */ if ($this->_type == IMAGE_GRAPH_AXIS_X) { In other words, by removing the first if-satement. Test script: --------------- <?php require_once 'Image/Graph.php'; // Create the graph $Graph =& Image_Graph::factory('graph', array(400, 300)); // Add a TrueType font $Font =& $Graph->addNew('font', 'Verdana'); // Set the font size to 11 pixels $Font->setSize(8); $Graph->setFont($Font); $Graph->add( Image_Graph::vertical( Image_Graph::factory('title', array('Bar Chart Sample', 12)), Image_Graph::vertical( $Plotarea = Image_Graph::factory('plotarea'), $Legend = Image_Graph::factory('legend'), 90 ), 5 ) ); $Legend->setPlotarea($Plotarea); // Create the dataset $Dataset =& Image_Graph::factory('random', array(1, 2, 15, false)); // Create the 1st plot as smoothed area chart using the 1st dataset $Plot =& $Plotarea->addNew('bar', array(&$Dataset)); // Set a line color $Plot->setLineColor('gray'); // Set a standard fill style $Plot->setFillColor('blue@0.2'); // Output the Graph $Graph->done(); ?> Expected result: ---------------- A graph with one centered bar. Actual result: -------------- A graph with no bar at all.

I want to provide my testing result for generating a graph with only one bar in it for v0.7.2. If the x-axis is a Image_Graph_Axis_Category or Image_Graph_Axis, the bar does get plotted. However, the bar is plotted right on the y-axis. If you change the color of the bar graph you will be able to view this. For a logarithmic axis, the single bar is generated correctly. There are existing work arounds for this behavior. If the x-axis is linear, Image_Graph_Axis, then force a minimum and maximum x-axis value and the bar will display nicely. If the x-axis is a category type, Image_Graph_Axis_Category, then add additional value to the dataset with x and y value (y's set to zero) in the desired order to have it appear on the x-axis. A possible appropriate behavior is to modify the code to let users input an offset value from the y-axis for the first value on the x-axis or vice versa, something like, setAxisOffset. This would also be beneficial for logarithmic axis as well. Alex