How to draw and move shapes using mouse in C#

c#, mousedown, mousemove, shapes

Solution

This seems to work

    protected override void OnMouseMove(MouseEventArgs e)
    {


        if (e.Button == MouseButtons.Left)
        {
            rec.Width = e.X - rec.X;
            rec.Height = e.Y - rec.Y;
            this.Invalidate();
        }

        if (e.Button == MouseButtons.Right)
        {
            rec.Location = new Point((e.X-MouseDownLocation.X) + rec.Left, (e.Y-MouseDownLocation.Y) + rec.Top);
            MouseDownLocation = e.Location;
            this.Invalidate();
        }
    }

Problem

I'm new to programming in C# and wanted to ask for a little bit of help. I'm currently trying to move a color-filled rectangle that I draw on a Windows Application form with my left mouse button, and I'm trying to drag-and-drop it to another location using my right mouse button. Currently I've managed to draw the rectangle, but the right click is dragging the entire form along. Here's my code: ``` public partial class Form1 : Form { private Point MouseDownLocation; public Form1() { InitializeComponent(); this.DoubleBuffered = true; } Rectangle rec = new Rectangle(0, 0, 0, 0); protected override void OnPaint(PaintEventArgs e) { e.Graphics.FillRectangle(Brushes.DeepSkyBlue, rec); } protected override void OnMouseDown(MouseEventArgs e) { if (e.Button == MouseButtons.Left) { rec = new Rectangle(e.X, e.Y, 0, 0); Invalidate(); } if (e.Button == MouseButtons.Right) { MouseDownLocation = e.Location; } } protected override void OnMouseMove(MouseEventArgs e) { if (e.Button == MouseButtons.Left) { rec.Width = e.X - rec.X; rec.Height = e.Y - rec.Y; Invalidate(); } if (e.Button == MouseButtons.Right) { this.Left = e.X + this.Left - MouseDownLocation.X; this.Top = e.Y + this.Top - MouseDownLocation.Y; } } } ``` I only need to drag-and-drop the rectangles with right mouse button. EDIT: Thanks to you all i got my answer very fast and here's the code that works: ``` public partial class Form1 : Form { private Point MouseDownLocation; public Form1() { InitializeComponent(); this.DoubleBuffered = true; } Rectangle rec = new Rectangle(0, 0, 0, 0); protected override void OnPaint(PaintEventArgs e) { e.Graphics.FillRectangle(Brushes.DeepSkyBlue, rec); //Generates the shape } protected override void OnMouseDown(MouseEventArgs e) { if (e.Button == MouseButtons.Left) //can also use this one: //if (e.Button == System.Windows.Forms.MouseButtons.Left) { rec = new Rectangle(e.X, e.Y, 0, 0); Invalidate(); } if (e.Button == MouseButtons.Right) { MouseDownLocation = e.Location; } } protected override void OnMouseMove(MouseEventArgs e) { if (e.Button == MouseButtons.Left) { rec.Width = e.X - rec.X; rec.Height = e.Y - rec.Y; this.Invalidate(); } if (e.Button == MouseButtons.Right) { rec.Location = new Point((e.X - MouseDownLocation.X) + rec.Left, (e.Y - MouseDownLocation.Y) + rec.Top); MouseDownLocation = e.Location; this.Invalidate(); } } } ```

Original source