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drawContour - Draw the contour of a specified elevation

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

Calling this function
drawContour($Threshold,$Format="")
Where :

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


Customisation array - Tune up your chart!

It is possible to customize the rendering by playing with this array. Providing a detailled configuration is not mandatory. You‘ll see below a representation of all the customization possible :

You can specify the color of the line with R,G,B,Alpha.
You can use ticks specifying their lenght with Ticks.
You can specify the padding value with Padding.


Sample script


 /* pChart library inclusions */
 include("../class/pData.class.php");
 include("../class/pDraw.class.php");
 include("../class/pImage.class.php");
 include("../class/pSurface.class.php");

 /* Create the pChart object */
 $myPicture = new pImage(400,400);

 /* Create a solid background */
 $Settings = array("R"=>179, "G"=>217, "B"=>91, "Dash"=>1, "DashR"=>199, "DashG"=>237, "DashB"=>111);
 $myPicture->drawFilledRectangle(0,0,400,400,$Settings);

 /* Do a gradient overlay */
 $Settings = array("StartR"=>194, "StartG"=>231, "StartB"=>44, "EndR"=>43, "EndG"=>107, "EndB"=>58, "Alpha"=>50);
 $myPicture->drawGradientArea(0,0,400,400,DIRECTION_VERTICAL,$Settings);
 $myPicture->drawGradientArea(0,0,400,20,DIRECTION_VERTICAL,array("StartR"=>0,"StartG"=>0,"StartB"=>0,"EndR"=>50,"EndG"=>50,"EndB"=>50,"Alpha"=>100));

 /* Add a border to the picture */
 $myPicture->drawRectangle(0,0,399,399,array("R"=>0,"G"=>0,"B"=>0));
 
 /* Write the picture title */ 
 $myPicture->setFontProperties(array("FontName"=>"../fonts/Silkscreen.ttf","FontSize"=>6));
 $myPicture->drawText(10,13,"pSurface() :: 2D surface charts",array("R"=>255,"G"=>255,"B"=>255));

 /* Define the charting area */
 $myPicture->setGraphArea(20,40,380,380);
 $myPicture->drawFilledRectangle(20,40,380,380,array("R"=>255,"G"=>255,"B"=>255,"Surrounding"=>-200,"Alpha"=>20));

 $myPicture->setShadow(TRUE,array("X"=>1,"Y"=>1));

 /* Create the surface object */
 $mySurface = new pSurface($myPicture);

 /* Set the grid size */
 $mySurface->setGrid(20,20);

 /* Write the axis labels */
 $myPicture->setFontProperties(array("FontName"=>"../fonts/pf_arma_five.ttf","FontSize"=>6));
 $mySurface->writeXLabels(array("Position"=>LABEL_POSITION_BOTTOM));
 $mySurface->writeYLabels();

 /* Add random values */
 for($i=0; $i<=50; $i++) { $mySurface->addPoint(rand(0,20),rand(0,20),rand(0,100)); }

 /* Compute the missing points */
 $mySurface->computeMissing();

 /* Draw the surface chart */
 $mySurface->drawSurface(array("Border"=>TRUE,"Surrounding"=>40));

 /* Draw the contour with a threshold of 50 */
 $mySurface->drawContour(50,array("R"=>0,"G"=>0,"B"=>0));

 /* Render the picture (choose the best way) */
 $myPicture->autoOutput("pictures/example.surface.png");
Last updated on 03/28/2011 
by Jean-Damien 
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