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drawFromPNG - Add pictures to your charts

This function allows you to add PNG pictures to your charts. If you turn on shadow support before calling this function, the merged picture will be drawn with the specified shadow parameters.

Calling this function
drawFromPNG($X,$Y,$FileName);
Where :

X,Y are the coordinate where will be drawn the top left corner of the picture.
FileName is the path to the picture file.

It is recommended to use PNG files when you want to include pictures into your charts. This is the only real portable format that can handle alpha channels, thus the pictures will look crystal clear.


Sample script



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

 /* Create the pChart object */
 $myPicture = new pImage(700,230);
 $myPicture->drawGradientArea(0,0,700,230,DIRECTION_VERTICAL,array("StartR"=>180,"StartG"=>193,"StartB"=>91,"EndR"=>120,"EndG"=>137,"EndB"=>72,"Alpha"=>100));
 $myPicture->drawGradientArea(0,0,700,230,DIRECTION_HORIZONTAL,array("StartR"=>180,"StartG"=>193,"StartB"=>91,"EndR"=>120,"EndG"=>137,"EndB"=>72,"Alpha"=>20));
 $myPicture->drawGradientArea(0,0,700,20,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(0,0,699,229,array("R"=>0,"G"=>0,"B"=>0));
 
 /* Write the picture title */ 
 $myPicture->setFontProperties(array("FontName"=>"../fonts/Silkscreen.ttf","FontSize"=>6));
 $myPicture->drawText(10,13,"drawFromPNG() - add pictures to your charts",array("R"=>255,"G"=>255,"B"=>255));

 /* Turn off shadow computing */ 
 $myPicture->setShadow(FALSE);

 /* Draw a PNG object */
 $myPicture->drawFromPNG(180,50,"resources/hologram.png");

 /* Turn on shadow computing */ 
 $myPicture->setShadow(TRUE,array("X"=>1,"Y"=>1,"R"=>0,"G"=>0,"B"=>0,"Alpha"=>20));

 /* Draw a PNG object */
 $myPicture->drawFromPNG(400,50,"resources/blocnote.png");

 /* Write the legend */
 $myPicture->setShadow(TRUE,array("X"=>1,"Y"=>1,"R"=>0,"G"=>0,"B"=>0,"Alpha"=>20));
 $TextSettings = array("R"=>255,"G"=>255,"B"=>255,"FontSize"=>10,"FontName"=>"../fonts/calibri.ttf","Align"=>TEXT_ALIGN_BOTTOMMIDDLE);
 $myPicture->drawText(240,190,"          Without shadow
(only PNG alpha channels)",$TextSettings);
 $myPicture->drawText(460,200,"With enhanced shadow",$TextSettings);

 /* Render the picture (choose the best way) */
 $myPicture->autoOutput("pictures/example.drawFromPNG.png");

This will draw two pictures, the first one with only alpha channels included in the PNG file (that may contains a shadow effect!!) and the second one with the internal pChart shadow algorithm.
Last updated on 12/23/2010 
by Jean-Damien 
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