How can I make a BaseCustomLayer Draw() fire more often?

Question

I'm experimenting with the idea of replacing my dynamic display moving graphics with the static (DynamicDisplayEnabled = false) moving graphics.

public class CustomLayer : BaseCustomLayer
{
        public override void Draw(esriDrawPhase drawPhase, IDisplay Display, ITrackCancel trackCancel)
        {
            int hdc = Display.hDC;
            IntPtr p = new IntPtr(hdc);
            Graphics graphics = Graphics.FromHdc(p);
            Image newImage = Image.FromFile(carImage);
            System.Drawing.Point ulCorner = new System.Drawing.Point(x, y);
            graphics.DrawImage(newImage, ulCorner);
        }
}

This code draws the image, but it only invokes draw once, unless I move the map with the pan tool or change the scale. How can I make the Draw function fire multiple times a second?

Answer 1

It's been a while, but when I was working on a project for vehicle tracking I think we used a timer in conjunction with Dispatcher.CurrentDispatcher to force a refresh. See this answer on using CurrentDispatcher.

I think we checked to make sure IViewRefresh.Drawing was false before calling refresh, but I think there were issues with that.