How can I draw boxes in C# when the position moves top-left to the initial position?

You can simplify your code significantly. Instead of creating a tempRect when mouse is down, you can create tempStartPoint This way, you will not need that many manipulations in the MouseMove event handler, all the code will boil down to one statement: tempRect = new Rectangle( Math. Min(tempStartPoint.

X, tempEndPoint. X), Math. Min(tempStartPoint.

Y, tempEndPoint. Y), Math. Abs(tempStartPoint.

X - tempEndPoint. X), Math. Abs(tempStartPoint.

Y - tempEndPoint. Y)) Full code: public partial class Form1 : Form { private readonly List rects = new List(); private Point tempStartPoint; private Rectangle tempRect; public Form1() { InitializeComponent(); } private void Form1_MouseDown(object sender, MouseEventArgs e) { tempStartPoint = e. Location; Invalidate(); } private void Form1_MouseMove(object sender, MouseEventArgs e) { if (e.

Button! = MouseButtons. Left) return; Point tempEndPoint = e.

Location; tempRect = new Rectangle( Math. Min(tempStartPoint. X, tempEndPoint.

X), Math. Min(tempStartPoint. Y, tempEndPoint.

Y), Math. Abs(tempStartPoint. X - tempEndPoint.

X), Math. Abs(tempStartPoint. Y - tempEndPoint.

Y)); Invalidate(); } private void Form1_MouseUp(object sender, MouseEventArgs e) { // Must be within constraint, prevents tiny invisible rectangles from being added if (tempRect. Width >= 10 && tempRect. Height >= 10) rects.

Add(tempRect); } private void Form1_Paint(object sender, PaintEventArgs e) { using (Pen pen = new Pen(Color. Black, 2)) { // Redraws all existing rectangles onto the form foreach (Rectangle rect in rects) e.Graphics. DrawRectangle(pen, rect); // Must be within constraint, prevents tiny invisible rectangles from being added if (tempRect.

Width >= 10 && tempRect. Height >= 10) e.Graphics. DrawRectangle(pen, tempRect); } } }.

You can simplify your code significantly. Instead of creating a tempRect when mouse is down, you can create tempStartPoint. This way, you will not need that many manipulations in the MouseMove event handler, all the code will boil down to one statement: tempRect = new Rectangle( Math.

Min(tempStartPoint. X, tempEndPoint. X), Math.

Min(tempStartPoint. Y, tempEndPoint. Y), Math.

Abs(tempStartPoint. X - tempEndPoint. X), Math.

Abs(tempStartPoint. Y - tempEndPoint. Y)); Full code: public partial class Form1 : Form { private readonly List rects = new List(); private Point tempStartPoint; private Rectangle tempRect; public Form1() { InitializeComponent(); } private void Form1_MouseDown(object sender, MouseEventArgs e) { tempStartPoint = e.

Location; Invalidate(); } private void Form1_MouseMove(object sender, MouseEventArgs e) { if (e. Button! = MouseButtons.

Left) return; Point tempEndPoint = e. Location; tempRect = new Rectangle( Math. Min(tempStartPoint.

X, tempEndPoint. X), Math. Min(tempStartPoint.

Y, tempEndPoint. Y), Math. Abs(tempStartPoint.

X - tempEndPoint. X), Math. Abs(tempStartPoint.

Y - tempEndPoint. Y)); Invalidate(); } private void Form1_MouseUp(object sender, MouseEventArgs e) { // Must be within constraint, prevents tiny invisible rectangles from being added if (tempRect. Width >= 10 && tempRect.

Height >= 10) rects. Add(tempRect); } private void Form1_Paint(object sender, PaintEventArgs e) { using (Pen pen = new Pen(Color. Black, 2)) { // Redraws all existing rectangles onto the form foreach (Rectangle rect in rects) e.Graphics.

DrawRectangle(pen, rect); // Must be within constraint, prevents tiny invisible rectangles from being added if (tempRect. Width >= 10 && tempRect. Height >= 10) e.Graphics.

DrawRectangle(pen, tempRect); } } }.

Much easier to read too, not sure where my bug was but this breaking it down like this makes it much easier to maintain and all works like a charm :) – Mohgeroth Jun 21 at 2:47.

You can simplify your code significantly. Instead of creating a tempRect when mouse is down, you can create tempStartPoint . This way, you will not need that many manipulations in the MouseMove event handler, all the code will boil down to one statement.

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