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Language Reference » Surface charts » drawContour
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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");
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