Is there a better way to handle click areas of an image?

Question

I have an image that you click on 2 points and creates a line between each point. In the end, what this department asks for is the ability to calculate the length of these lines and where these lines originated. They currently do this manually / paper / pen / ruler. This is one of the images I work with.

These cracks in the middle are considered “area 7”.

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    if (e.Button.Equals(MouseButtons.Left))
    {
        Rectangle zone1 = new Rectangle(35, 30, 770, 30);
        if (zone1.Contains(e.Location))
        {
            MessageBox.Show("Zone1");                  
        }
        Rectangle zone2 = new Rectangle(890, 40, 330, 300);
        if (zone2.Contains(e.Location))
        {
            MessageBox.Show("Zone2");
        }
        Rectangle zone3 = new Rectangle(340, 340, 850, 60);
        if (zone3.Contains(e.Location))
        {
            MessageBox.Show("Zone3");
        }
        Rectangle zone4 = new Rectangle(100, 25, 75, 300);
        if (zone4.Contains(e.Location))
        {
            MessageBox.Show("Zone4");
        }
        //4-1 trying to cover areas missed in zone4
        Rectangle zone41 = new Rectangle(255, 270, 120, 240);
        if (zone41.Contains(e.Location))
        {
            MessageBox.Show("Zone4-1");
        }
        Rectangle zone5 = new Rectangle(310, 100, 180, 150);
        if (zone5.Contains(e.Location))
        {
            MessageBox.Show("Zone5");
        }
        //5-1 trying to cover areas missed in zone5
        Rectangle zone51 = new Rectangle(220, 80, 60, 45);
        if (zone51.Contains(e.Location))
        {
            MessageBox.Show("Zone5-1");
        }
        Rectangle zone6 = new Rectangle(635, 35, 250, 210);
        if (zone6.Contains(e.Location))
        {
            MessageBox.Show("Zone6");
        }
    }

Answer 1

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, :

class MyForm
{
    Bitmap zoneDisplay;
    Bitmap zoneMap;

    protected override void OnLoad(EventArgs e)
    {
        base.OnLoad(e);

        zoneDisplay = (Bitmap)Image.FromFile(@"c:\temp\zonedisp.png"); // replace with actual path to file
        zoneMap = (Bitmap)Image.FromFile(@"c:\temp\zonemap.png");

        // put the display image into the picturebox (or whatever control displays it)
        pictureBox.Image = zoneDisplay;
    }

, , :

private void pictureBox_MouseDown(object sender, MouseEventArgs e)
{
    var color = _zoneMap.GetPixel(e.X, e.Y);
    if (color == Color.FromArgb(0, 0, 255))
        MessageBox.Show("Zone 1");
    else if (color == Color.FromArgb(255, 0, 0))
        MessageBox.Show("Zone 2");
    else if (color == Color.FromArgb(0, 255, 0))
        MessageBox.Show("Zone 3");
    // etc...
}

, . :

static int ColorDelta(Color c1, Color c2)
{
    return Math.Abs(c1.R - c2.R) + Math.Abs(c1.G - c2.G) - Math.Abs(c1.B - c2.B);
}

private void pictureBox_MouseDown(object sender, MouseEventArgs e)
{
    var color = _zoneMap.GetPixel(e.X, e.Y);
    if (90 > ColorDelta(color, Color.FromArgb(0, 0, 255)))
        MessageBox.Show("Zone 1");
    else if (90 > ColorDelta(color, Color.FromArgb(255, 0, 0)))
        MessageBox.Show("Zone 2");
    else if (90 > ColorDelta(color, Color.FromArgb(0, 255, 0)))
        MessageBox.Show("Zone 3");
    // etc...
}