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drawStepChart - Draw a step chart

This function allows you to draw a step chart. All the drawing parameters are given trough a $Format array. To learn more about this please read the Format array guide.

Calling this function
Where :

Format is an array containing the drawing parameters of the chart.

Customisation array - Tune up your chart!

It is possible to customize the chart rendering by playing with this array. Providing a detailled configuration is not mandatory.

You can specify if the values must be written on the chart setting DisplayValues to TRUE or FALSE.
You can specify the text UP/RIGHT offset with DisplayOffset.
You can enable image map recording by setting RecordImageMap to TRUE.
You can specify the labels color with DisplayR,DisplayG,DisplayB.

You can define if the labels color will be the same than the serie color of if you want to force it manually setting DisplayColor to :

DISPLAY_MANUAL, color will be specified manually with DisplayR,DisplayG,DisplayB.
DISPLAY_AUTO, will use the serie color.

Handling of missing points

By default, the chart will break everytime a VOID value will be found. If you want to draw a straight line between the missing points then you can set the BreakVoid parameter to FALSE. If you don‘t set a custom color, the serie color will be used. The missing values rendering parameters can be tuned with :

The size of the ticks can be set with VoidTicks.
The line color can be set with BreakR,BreakG,BreakB.

Sample script

 /* pChart library inclusions */

 /* Create and populate the pData object */
 $MyData = new pData();  
 $MyData->addPoints(array(-4,VOID,VOID,12,8,3),"Probe 1");
 $MyData->addPoints(array(3,12,15,8,5,-5),"Probe 2");
 $MyData->addPoints(array(2,7,5,18,19,22),"Probe 3");
 $MyData->setSerieTicks("Probe 2",4);

 /* Create the pChart object */
 $myPicture = new pImage(700,230,$MyData);

 /* Draw the background */
 $Settings = array("R"=>170, "G"=>183, "B"=>87, "Dash"=>1, "DashR"=>190, "DashG"=>203, "DashB"=>107);

 /* Overlay with a gradient */
 $Settings = array("StartR"=>219, "StartG"=>231, "StartB"=>139, "EndR"=>1, "EndG"=>138, "EndB"=>68, "Alpha"=>50);

 /* Add a border to the picture */
 /* Write the picture title */ 
 $myPicture->drawText(10,13,"drawStepChart() - draw a step chart",array("R"=>255,"G"=>255,"B"=>255));

 /* Write the chart title */ 
 $myPicture->drawText(250,55,"Average temperature",array("FontSize"=>20,"Align"=>TEXT_ALIGN_BOTTOMMIDDLE));

 /* Draw the scale and the 1st chart */

 /* Draw the scale and the 2nd chart */

 /* Write the chart legend */

 /* Render the picture (choose the best way) */
Last updated on 08/04/2011 
by Jean-Damien 
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