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strokeFromCache - Pick up from the cache and send to the browser

This function allows you to retrieve a cached object and send it directly to the user web browser. Basically it will works the same way than where you‘ll call the stroke() function from the pChart class.

This function will automatically send the Content-type header to the user web browser.


Calling this function
strokeFromCache($ID);

ID is the unique ID affected to this object.


Sample script



 /* Include all the classes */ 
 include("class/pDraw.class.php"); 
 include("class/pImage.class.php"); 
 include("class/pData.class.php");
 include("class/pCache.class.php");

 /* Create your dataset object */ 
 $myData = new pData(); 
 
 /* Add data in your dataset */ 
 $myData->addPoints(array(1,3,4,3,5));

 /* Create the cache object */
 $myCache = new pCache();

 /* Compute the hash linked to the chart data */
 $ChartHash = $myCache->getHash($myData);

 /* Test if we got this hash in our cache already */
 if ( $myCache->isInCache($ChartHash))
  {
   /* If we have it, get the picture from the cache! */
   $myCache->strokeFromCache($ChartHash);
  }
 else
  {
   /* Create a pChart object and associate your dataset */ 
   $myPicture = new pImage(700,230,$myData);

   /* Choose a nice font */
   $myPicture->setFontProperties(array("FontName"=>"fonts/Forgotte.ttf","FontSize"=>11));

   /* Define the boundaries of the graph area */
   $myPicture->setGraphArea(60,40,670,190);

   /* Draw the scale, keep everything automatic */ 
   $myPicture->drawScale();

   /* Draw the scale, keep everything automatic */ 
   $myPicture->drawSplineChart();

   /* Do some cosmetics */
   $myPicture->drawGradientArea(0,0,700,20,DIRECTION_VERTICAL,array("StartR"=>0,"StartG"=>0,"StartB"=>0,"EndR"=>50,"EndG"=>50,"EndB"=>50,"Alpha"=>100));
   $myPicture->setFontProperties(array("FontName"=>"fonts/Silkscreen.ttf","FontSize"=>6));
   $myPicture->drawText(10,13,"Test of the pCache class",array("R"=>255,"G"=>255,"B"=>255));

   /* Push the rendered picture to the cache */
   $myCache->writeToCache($ChartHash,$myPicture);

   /* Render the picture */
   $myPicture->stroke();
  }

The first time that this code will be executed, the picture will be sent to the user browser and pushed in the cache, the next times, it will be retrieved from the cache directly saving CPU and execution time.
Last updated on 08/24/2010 
by Jean-Damien 
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