How to create a clickable irregularly-shaped region in c#

Question

I have an irregularly-shaped picture like a heart or any random shape. I can make it transparent visually, but I need to make it clickable only on the shape area. I heard th

Answer 1

Here is a Winforms example of handling an image mask. When the user clicks on the mask image it pops up a message box. This basic technique can obviously be modified to suit.

public partial class Form1 : Form {
    readonly Color mask = Color.Black;
    public Form1() {
        InitializeComponent();
    }

    private void pictureBox1_Click(object sender, EventArgs e) {
        var me = e as MouseEventArgs;
        using (var bmp = new Bitmap(pictureBox1.Image)) {
            if (me.X < pictureBox1.Image.Width && me.Y < pictureBox1.Image.Height) {
                var colorAtMouse = bmp.GetPixel(me.X, me.Y);
                if (colorAtMouse.ToArgb() == mask.ToArgb()) {
                    MessageBox.Show("Mask clicked!");
                }
            }
        }
    }
}

pictureBox1 has an Image loaded from a resource of a heart shape that I free-handed.