Display flickers

Archive
1

I want to show some sensor measurements on the display. However it flickers everytime when it redraws the values.

The first text that is displayed doesn’t flicker, but all the others do, see the comments!

void barometer_MeasurementComplete(Barometer sender, Barometer.SensorData sensorData) //called every 100 milliseconds
        {
            double proportion = input.ReadProportion() * 1000;

            display_T35.SimpleGraphics.ClearNoRedraw();
            display_T35.SimpleGraphics.DisplayTextInRectangle("AAAA", 1, 1, 300, 10, GT.Color.White, Resources.GetFont(Resources.FontResources.NinaB)); // NOT FLICKERING AT ALL
            display_T35.SimpleGraphics.DisplayText("BBBB: " + System.Math.Round(proportion).ToString(), Resources.GetFont(Resources.FontResources.NinaB), GT.Color.White, 1, 25); //FLICKERS A BIT
            display_T35.SimpleGraphics.DisplayText("CCCC: " + System.Math.Round(sensorData.Temperature).ToString(), Resources.GetFont(Resources.FontResources.NinaB), GT.Color.White, 1, 35); // MORE FLICKERING
            display_T35.SimpleGraphics.DisplayText("DDDD: " + System.Math.Round(sensorData.Pressure).ToString(), Resources.GetFont(Resources.FontResources.NinaB), GT.Color.White, 1, 45); //  EVEN MORE
            TimeSpan tmp = (DateTime.Now-started);
            GT.Color color = GT.Color.Red;
            if ((tmp - heattime).Ticks > 0)
                color = GT.Color.Green;
            display_T35.SimpleGraphics.DisplayText("EEEE " + (tmp.Days * 24 + tmp.Hours).ToString() + ":" + (tmp.Minutes).ToString() + ":" + tmp.Seconds.ToString(), Resources.GetFont(Resources.FontResources.NinaB), color, 1, 220); // FLICKERS VERY STRONG
            display_T35.SimpleGraphics.Redraw();
        }

How can I make this more smooth?

2

Buffer it out. Simple graphics will flush after every call. Draw to a bitmap and then flush that when you’re done.

3

Thanks, that’s much better :slight_smile:

4

This is a great way to do it. Another quick way to do it would be to set the display’s Auto Redraw property to false.

display_T35.SimpleGraphics.AutoRedraw = false;