C# Line Control with Rotate Option

• Download demo project - 66.9 KB
• Download source - 25.2 KB

Introduction

I decided to write this line control in C# when I was unable to find a suitable solution on the Internet. My scenario was to draw straight and curved lines to highlight pathways to a destination. Here, the line region is automatically controlled in the bitLineControl class.

Using the code

Using the code is not difficult; you just have to add the reference bitLineControl in your project. Declare and initialize the class variable and, while calling the constructor, just pass two points to draw a line between them:

//--------------------------------------------------------------------------
//  Variable Declaration
//--------------------------------------------------------------------------
    bitLineControl varbitLine;
    
//--------------------------------------------------------------------------
//  calling the constructor
//--------------------------------------------------------------------------
    Point firstPoint = new Point( x1, y1);
    Point secondPoint = new Point(x2, y2 );
    varbitLine = new bitLineControl(firstPoint, secondPoint);
    this.Controls.Add(varbitLine);
//--------------------------------------------------------------------------

You can also rotate the line by calling the rotateByAngle(angle) method of the class. For example, the following code will rotate the line 10 degrees from its current location:

varbitLine.rotateByAngle(10);

You can also supply a negative value to rotate it back.

Points of interest

The main problem faced here was setting the region for the line control. Because it can be a rotated line or the user can rotate the line whenever required, the coordinates can go into the negative when rotated.

History

• May 14, 2007 - Original version posted

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)