Displaying real-time data

Now that we have seen how easy it is to create a static chart, let's take a look at the process of creating a chart that updates in real time. Essentially, the process is the same, but we'll need to periodically update the chart's data series with fresh data. To demonstrate this, let's make a real-time CPU usage monitor.

Building a CPU usage chart

Let's start our CPU monitor in a new class called CPUUsageView:

class CPUUsageView(qtch.QChartView):

    num_data_points = 500
    chart_title = "CPU Utilization"

    def __init__(self):
        super().__init__()
        chart = qtch.QChart(title=self.chart_title)
        self.setChart(chart)

Just as we did with our disk usage...