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#jpgraph/src/Examples/balloonex2.php

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+<?php // content="text/plain; charset=utf-8"
+require_once ('jpgraph/jpgraph.php');
+require_once ('jpgraph/jpgraph_scatter.php');
+
+// Each ballon is specificed by four values. 
+// (X,Y,Size,Color)
+$data = array(
+    array(1,12,10,'orange'),
+    array(3,41,15,'red'),
+    array(4,5,19,'lightblue'),
+    array(5,70,22,'yellow')
+);
+
+
+
+// We need to create X,Y data vectors suitable for the
+// library from the above raw data.
+$n = count($data);
+for( $i=0; $i < $n; ++$i ) {
+    
+    $datax[$i] = $data[$i][0];
+    $datay[$i] = $data[$i][1];
+
+    // Create a faster lookup array so we don't have to search
+    // for the correct values in the callback function
+    $format[strval($datax[$i])][strval($datay[$i])] = array($data[$i][2],$data[$i][3]);
+    
+}
+
+
+// Callback for markers
+// Must return array(width,border_color,fill_color,filename,imgscale)
+// If any of the returned values are '' then the
+// default value for that parameter will be used (possible empty)
+function FCallback($aYVal,$aXVal) {
+    global $format;
+    return array($format[strval($aXVal)][strval($aYVal)][0],'',
+		 $format[strval($aXVal)][strval($aYVal)][1],'','');
+}
+
+// Setup a basic graph
+$graph = new Graph(450,300,'auto');
+$graph->SetScale("intlin");
+$graph->SetMargin(40,40,40,40);		
+$graph->SetMarginColor('wheat');
+
+$graph->title->Set("Example of ballon scatter plot with X,Y callback");
+$graph->title->SetFont(FF_ARIAL,FS_BOLD,12);
+$graph->title->SetMargin(10);
+
+// Use a lot of grace to get large scales since the ballon have
+// size and we don't want them to collide with the X-axis
+$graph->yaxis->scale->SetGrace(50,10);
+$graph->xaxis->scale->SetGrace(50,10);
+
+// Make sure X-axis as at the bottom of the graph and not at the default Y=0
+$graph->xaxis->SetPos('min');
+
+// Set X-scale to start at 0
+$graph->xscale->SetAutoMin(0);
+
+// Create the scatter plot
+$sp1 = new ScatterPlot($datay,$datax);
+$sp1->mark->SetType(MARK_FILLEDCIRCLE);
+
+// Uncomment the following two lines to display the values
+$sp1->value->Show();
+$sp1->value->SetFont(FF_FONT1,FS_BOLD);
+
+// Specify the callback
+$sp1->mark->SetCallbackYX("FCallback");
+
+// Add the scatter plot to the graph
+$graph->Add($sp1);
+
+// ... and send to browser
+$graph->Stroke();
+
+?>
+
+