$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");
