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| Bug #14551 | forceMinimum screws up Axis span on logarithmic axis | ||
|---|---|---|---|
| Submitted: | 2008-08-23 03:18 UTC | ||
| From: | xulchris | Assigned: | |
| Status: | Open | Package: | Image_Graph (version 0.7.2) |
| PHP Version: | 5.2.6 | OS: | Fedora 9 |
| Roadmaps: | (Not assigned) | ||
[2008-08-23 03:18 UTC] xulchris
(Christopher Stone)
Description:
------------
When using forceMinimum and forceMaximum on a logarithmic axis, the axis span gets messed up. For example, on auto it will plot an axis from 1 to 100 in the sample code below, but if you set a minimum of 20, then the maximum gets cut off by 20 as well and it plots from 20 to 80 instead of 20 to 100.
Test script:
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<?php
require_once 'Image/Graph.php';
$d = Image_Graph::factory('dataset');
for($i=1; $i<=10; $i++) $d->addPoint($i,$i*$i);
$g = Image_Graph::factory('graph', array(1024, 768));
$g->add($p = Image_Graph::factory('plotarea', array('Image_Graph_Axis_Category', 'Image_Graph_Axis_Logarithmic')));
$p->addNew('line', $d);
$a = $p->getAxis(IMAGE_GRAPH_AXIS_Y);
// HERE IS THE BUG, THE GRAPH PLOTS FROM 20 to 100 instead of 20 to 120.
// IF WE REMOVE FORCE MAXIMUM OR SET IT TO 100, IT ONLY PLOTS TO 80.
$a->forceMinimum(20);
$a->forceMaximum(120);
$g->done(array('filename' => "foo.png"));
?>
Expected result:
----------------
setting forceMinimum should not affect the maximum in a log scale, for example:
$a->forceMinimum(20);
$a->forceMaximum(100);
this should plot from 20 to 100, not 20 to 80 as it currently does.
Actual result:
--------------
Messed up axis and plots.