The graph can also be updated automatically using javascript without user intervention. This is useful to potting charts for situation where data points come from a continuous source such as stock and weather. The key is to use standard javascript setInterval function to set replotting interval.
Javascript (partial source. Only to demostrate how setInterval is used. See live demo for complete source):
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | function UpdateGraph() { StopGraphLoop(); interval = parseInt($('#interval').val()); npoints = parseInt($('#npoints').val()); maxIterations = parseInt($('#maxIterations').val()); niters = 0; GraphUpdate = setInterval(runUpdate, interval); } function runUpdate() { if (niters < maxIterations) { BuildDataArray(); Graph.series[0].data = GraphData; Graph.replot({resetAxes:true}); niters++; } else { StopGraphLoop(); } } function StopGraphLoop() { clearInterval(GraphUpdate); } |
PHP (partial)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | $pc = new C_PhpChartX(array($GraphData),'Graph'); $pc->add_plugins(array('canvasTextRenderer','canvasAxisTickRenderer','canvasAxisLabelRenderer','highlighter','canvasOverlay','cursor','pointLabels'),true); $pc->set_title(array('text'=>'Test Data Run')); $pc->set_cursor(array('show'=>false)); $pc->set_point_labels(array('show'=>false)); $pc->set_highlighter(array('show'=>false)); $pc->set_axes_default(array( 'pad'=>0.05, 'labelRenderer'=>'plugin::CanvasAxisLabelRenderer', 'tickRenderer'=>'plugin::CanvasAxisTickRenderer', 'labelOptions'=>array('fontSize'=>'13pt') )); $pc->set_axes(array( 'xaxis'=> array('label'=> 'Number'), 'yaxis'=> array('label'=>'Value') )); // should be the last method to call $pc->draw(800,500); |
