Revision: 6519
http://phpwiki.svn.sourceforge.net/phpwiki/?rev=6519&view=rev
Author: vargenau
Date: 2009-02-20 13:50:58 +0000 (Fri, 20 Feb 2009)
Log Message:
-----------
Handle correctly negative values in charts
Modified Paths:
--------------
trunk/lib/plugin/Chart.php
Modified: trunk/lib/plugin/Chart.php
===================================================================
--- trunk/lib/plugin/Chart.php 2009-02-20 13:10:56 UTC (rev 6518)
+++ trunk/lib/plugin/Chart.php 2009-02-20 13:50:58 UTC (rev 6519)
@@ -87,17 +87,24 @@
// x_min = 0
// x_max = number of elements in data
- // y_min = 0
+ // y_min = 0 or smallest element in data if negative
// y_max = biggest element in data
- $x_max = sizeof($values);
+ $x_max = sizeof($values) + 1;
+ $y_min = min($values);
+ if ($y_min > 0) {
+ $y_min = 0;
+ }
$y_max = max($values);
+ // sum is used for the pie only, so we ignore negative values
$sum = 0;
foreach ($values as $value) {
- $sum += $value;
+ if ($value > 0) {
+ $sum += $value;
+ }
}
- $source = 'initPicture(0,'.$x_max.',0,'.$y_max.'); axes(); stroke = "'.$color.'"; strokewidth = 5;';
+ $source = 'initPicture(0,'.$x_max.','.$y_min.','.$y_max.'); axes(); stroke = "'.$color.'"; strokewidth = 5;';
if ($type == "bar") {
$abscisse = 1;
@@ -126,8 +133,10 @@
. 'point = [1, 0]; line(center, point);';
$angle = 0;
foreach ($values as $value) {
- $angle += $value/$sum;
- $source .= 'point = [cos(2*pi*'.$angle.'), sin(2*pi*'.$angle.')]; line(center, point);';
+ if ($value > 0) {
+ $angle += $value/$sum;
+ $source .= 'point = [cos(2*pi*'.$angle.'), sin(2*pi*'.$angle.')]; line(center, point);';
+ }
}
}
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