By using the drawing API rect object you can make the whole bar of a stacked Bar chart clickable - allowing you to 'group' tooltips etc
This goes in the documents header:<script src="RGraph.common.core.js"></script> <script src="RGraph.common.dynamic.js"></script> <script src="RGraph.common.tooltips.js"></script> <script src="RGraph.drawing.rect.js"></script> <script src="RGraph.bar.js"></script>Put this where you want the chart to show up:
<canvas id="cvs" width="600" height="250">
[No canvas support]
</canvas>
This is the code that generates the chart:
<script>
window.onload = function ()
{
var tooltips = ['John results','James results','Freds results','Luke results','Luis results'];
var bar = new RGraph.Bar({
id: 'cvs',
data: [[5.33,2.33,3.32],[3.42,2.23,4.23],[4.23,3.23,4.99], [7.99,2.98,2.35], [2.75,1.02,5.24]],
options: {
labels: ['John','James','Fred','Luke','Luis'],
labelsAbove: true,
labelsAboveDecimals: 2,
linewidth: 2,
strokestyle: 'white',
colors: ['Gradient(#4572A7:#66f)','Gradient(#AA4643:white)','Gradient(#89A54E:white)'],
shadow: true,
shadowOffsetx: 1,
shadowOffsety: 1,
shadowBlur: 5,
hmargin: 25,
gutterLeft: 45,
backgroundGridVlines: false,
backgroundGridBorder: false,
axisColor: '#ccc',
noyaxis: true,
grouping: 'stacked',
textAccessible: true
}
}).draw()
for (var i=0; i<bar.coords2.length; ++i) {
var x = bar.coords2[i][0][0];
var y = bar.coords2[i][0][1];
var w = bar.coords2[i][0][2];
var h = bar.coords2[i][0][3] + bar.coords2[i][1][3] + bar.coords2[i][2][3]; // Sum up the heights of the bar segments
var rect = new RGraph.Drawing.Rect({
id: 'cvs',
x: x,
y: y,
width: w,
height: h,
options: {
strokestyle: 'rgba(0,0,0,0)',
fillstyle: 'rgba(0,0,0,0)',
tooltips: [tooltips[i]],
highlightStroke: 'rgba(0,0,0,0)'
}
}).draw()
}
};
</script>