how to record multiple mouse clicks in c#

Question

I am trying to create a paint program in c#, I have got the Objects to draw on the screen when I click the mouse. Know what I am trying to do is record all the places that the user clicks so that I can redraw the graphics later. I know I could do it with a list with this:

Point recordpoint = new Point(i.X, i.Y);
List<Point> pts = new List<Point>();
pts.Add(recordpoint);

This only adds the last mouse click and I need to know how add an infinite amount of mouse clicks to the list and I have no idea how to do this.

I would love it if anyone new how to do this.

Answer 1

Assuming you have an "OnClick" event available to handle then you can just move the collection to the class level and item new items on click:

public class MyClass
{

List<Point> pts = new List<Point>();//This way the member persists

public void OnClick(TypeName i, EventArgs e)//whatever params are..
{
    Point recordpoint = new Point(i.X, i.Y);//create element
    pts.Add(recordpoint);//insert into collection
}

}

Answer 2

You are creating a new list every time you add a point.

Move List<Point> pts into the top level of your Form class, so you are creating one list only.

class PaintForm : Form {

    // declare a list of points as a field
    private List<Point> pts = new List<Point>();

    // ..

    private void PictureBox1_OnMouseDown(..) {  // or whereever this code was
        Point recordpoint = new Point(i.X, i.Y);
        pts.Add(recordpoint);    
    }

    // ..
}