Radar re-draw sweep animation C#

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I'm trying to make a radar animation which draws echos (as bitmaps). I'm having a hard time figuring out the logic to make the radar re-draw bit-by-bit.

Right now, everything appears all at once. To add a bit of realism to it, I want to have the echos appear as the sweep passes by. This is the code I have to just make the bitmap all at once:

    Graphics g;
    Graphics g2;
    Bitmap echos;

    public Form1()
    {
        this.DoubleBuffered = true;
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        g = this.CreateGraphics();
        g.Clear(Color.Black);

        echos= new Bitmap(@"5NM.png"); // acutal bitmap file path shortened
        g2 = Graphics.FromImage(echos);
    }

    // push button to draw echos
    private void button2_Click(object sender, EventArgs e) 
    {
        g.DrawImage(echos, 5, 0);
    }

    private void timer1_Tick(object sender, EventArgs e)
    {
        // this is the part I'm stuck at to make echos draw with a sweep
    }

asked 23 secs ago

henrydavc

1

Radar re-draw sweep animation C#