Vertical Progress bar
The Bar chart can be customised to appear as a Vertical Progress bar. This means that all of the properties that pertain to the Bar chart, such as tooltips, can be used as well. There's an example in the download archive that you can see here.
Example
<script> // This Bar chart becomes the background of the progress bar new RGraph.SVG.Bar({ id: 'chart-container', data: [100], options: { colors: ['Gradient(#eee:white)'], marginLeft: 45, marginRight: 5, backgroundGrid: false, colorsStroke: '#ccc', marginInner: 10, yaxis: false, yaxisScale: false, xaxis: false, linewidth: .5, shadow: true, shadowOpacity: .1 } }).draw(); // This Bar chart becomes the inner bar of the progress bar new RGraph.SVG.Bar({ id: 'chart-container', data: [73], options: { yaxisScaleMax: 100, yaxisScaleUnitsPost: '%', yaxisTextColor: '#666', yaxis: false, xaxis: false, shadow: true, shadowOffsetx: 1, shadowOffsety: 1, shadowBlur: 1, titleColor: '#666', colors: ['Gradient(red:#fcc)'], backgroundGrid: false, tooltips: ['Monday was an average day'], tooltipsCss: { backgroundColor: '#333', fontWeight: 'bold', fontSize: '14pt', opacity: 0.85 }, marginLeft: 45, marginRight: 5, marginInner: 15 } }).grow(); </script>