This example demonstrates swapping the x and y axes to produce a rotated line chart in which the line goes from top to bottom (instead of left to right).

The x and y axes in the example are configured as follows:

• Initially, the direction of the x-axis is left to right and is at the bottom of the chart, while the y-axis is from bottom to top and is on the left of the chart.
  
  
• Swap the x and y axes using XYChart.swapXY. Now the x-axis is from bottom to top and is on the left of the chart, while the y-axis is from left to right and is at the bottom of the chart.
  
  
• Use XYChart.setYAxisOnRight to move the y-axis to the opposite side of the plot area, so that the y-axis is on the top of the plot area (instead of at the bottom). (Note: setYAxisOnRight moves the primary y-axis to the opposite side. It is the right side by default, but will become the top side if x and y axes are swapped. The name of this method is for compatibility with earlier versions of ChartDirector in which XYChart.swapXY was not supported.)
  
  
• Use Axis.setReverse to reverse the direction of the x-axis, so that the x-axis is from top to bottom (instead of bottom to top).

For demo purposes, this example uses RanTable to simulate a database table with 4 columns, in which one is a date/time column and the remaining three are data columns. The date/time column is passed to ChartDirector as the x values using Layer.setXData, while the data columns are passed to ChartDirector as y values using Layer.addDataSet.

[File: phpdemo/rotatedline.php".]

<?php require_once("../lib/phpchartdir.php"); # # We use a random table to simulate generating 12 months of data # #Create the random table object with 4 cols * 12 rows, using 3 as seed $rantable = new RanTable(3, 4, 12); #Set the 1st column to be the 12 months of year 2002 $rantable->setDateCol(0, chartTime(2002, 1, 1), 86400 * 30); #Set the 2nd, 3rd and 4th columns to be random numbers starting from 125, 75, #and 100 respectively. The change between rows is set to -35 to + 35. The #minimum value of any cell is 0. $rantable->setCol(1, 125, -35, 35, 0); $rantable->setCol(2, 75, -35, 35, 0); $rantable->setCol(3, 100, -35, 35, 0); #Get the 1st column (time) as the x data $dataX = $rantable->getCol(0); #Get the 2nd, 3rd and 4th columns as 3 data sets $dataY0 = $rantable->getCol(1); $dataY1 = $rantable->getCol(2); $dataY2 = $rantable->getCol(3); #Create a XYChart object of size 360 x 400 pixels $c = new XYChart(360, 400); #Add a title to the chart $c->addTitle("<*underline=2*>Rotated Line Chart Demo", "timesbi.ttf", 14); #Set the plotarea at (60, 75) and of size 190 x 320 pixels. Turn on both #horizontal and vertical grid lines with light grey color (0xc0c0c0) $plotAreaObj = $c->setPlotArea(60, 75, 190, 320); $plotAreaObj->setGridColor(0xc0c0c0, 0xc0c0c0); #Add a legend box at (270, 75) $c->addLegend(270, 75); #Swap the x and y axis to become a rotated chart $c->swapXY(); #Set the y axis on the top side (right + rotated = top) $c->setYAxisOnRight(); #Add a title to the y axis $c->yAxis->setTitle("Throughput (MBytes)"); #Reverse the x axis so it is pointing downwards $c->xAxis->setReverse(); #Add a line chart layer using the given data $layer = $c->addLineLayer2(); $layer->setXData($dataX); $layer->addDataSet($dataY0, 0xff0000, "Server A"); $layer->addDataSet($dataY1, 0x338033, "Server B"); $layer->addDataSet($dataY2, 0xff, "Server C"); #Set the line width to 2 pixels $layer->setLineWidth(2); #output the chart header("Content-type: image/png"); print($c->makeChart2(PNG)); ?>