This example demonstrates using a log scale axis versus a linear scale axis.
In ChartDirector, log scale axis can be configured using Axis.setLogScale, Axis.setLogScale2 or Axis.setLogScale3.
ChartDirector 6.0 (PHP Edition)
Log Scale Axis
Source Code Listing
<?php
require_once("../lib/phpchartdir.php");
# This script can draw different charts depending on the chartIndex
$chartIndex = (int)($_REQUEST["img"]);
# The data for the chart
$data = array(100, 125, 260, 147, 67);
$labels = array("Mon", "Tue", "Wed", "Thu", "Fri");
# Create a XYChart object of size 200 x 180 pixels
$c = new XYChart(200, 180);
# Set the plot area at (30, 10) and of size 140 x 130 pixels
$c->setPlotArea(30, 10, 140, 130);
# Ise log scale axis if required
if ($chartIndex == 1) {
$c->yAxis->setLogScale3();
}
# Set the labels on the x axis
$c->xAxis->setLabels($labels);
# Add a color bar layer using the given data. Use a 1 pixel 3D border for the bars.
$barLayerObj = $c->addBarLayer3($data);
$barLayerObj->setBorderColor(-1, 1);
# Output the chart
header("Content-type: image/png");
print($c->makeChart2(PNG));
?> |