how to move GraphicsPath onMouseMove

Question

am using GraphicsPath to draw Lines so it's like Pen/Brush tool in Paint

   public void OnMouseDown(object sender, MouseEventArgs e)
    {
        start = e.Location;
        path.AddLine(e.Location, new Point(e.Location.X, e.Location.Y));
    }

    public void OnMouseMove(object sender, MouseEventArgs e)
    {
        end = e.Location;
        path.AddLine(e.Location, new Point(e.Location.X, e.Location.Y));
    }

    public void OnMouseUp(object sender, MouseEventArgs e)
    {
        end = e.Location;
        path.AddLine(e.Location, new Point(e.Location.X, e.Location.Y));
    }

    public void OnPaint(object sender, Graphics g)
    {
        g.DrawPath(pen, path);
    }

how would I Relocate it , I have tried Transform method , but it didn't work..

 public void Relocate(MouseEventArgs e)
    {
        Matrix m = new Matrix();
        m.Translate(start.X + e.X - end.X, start.Y + e.Y - end.Y, MatrixOrder.Append);
        path.Transform(m);

    }

so how would I do it the right way? moving the whole drawn shape?

score 1 · Answer 1 · answered Aug 04 '15 at 02:53

1

Have you tried:

Separating logic for creating line and moving line? I think you would need it in your implementation to differentiate which operation you are doing.

When moving the line, the path can be transformed via your Relocate() method and the following should be sufficient:

Matrix matrix = new Matrix();
matrix.Translate( offsetX, offsetY ); //Where offset is the new location
path.Transform( matrix ); //Transform the path

Then do not forget to redraw the path via Invalidate()

answered Aug 04 '15 at 02:53

Joel Legaspi Enriquez

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am separating the logic of-course , and I have tried that `matrix.Translate( offsetX, offsetY ); ` where the new offsets are the mouse location , but that is not working correctly! – Abanoub Aug 04 '15 at 03:20
_the new offsets are the mouse location_ of course they should be the distance to the last position..! – TaW Aug 04 '15 at 07:26
@TaW and how would I get the distance? – Abanoub Aug 04 '15 at 18:54
You need to keep track of the previous position! – TaW Aug 04 '15 at 19:01

how to move GraphicsPath onMouseMove

1 Answers1