Using CRectTrackerCS in C#

Download demo - 16.8 KB

Screenshot - CRectTrackerCS2.1_Demo.gif

Introduction

I am a novice in C# and OOP. I found that the TrackRubberBand method of the MFC CRectTracker class is not available in .NET. So I wrote a simple class RectTracker in C# and I called it CRectTrackerCS. I hope it is helpful to you.

To throw out a minnow to catch a whale. If you find problems and bugs in this code, please tell me about it. Thanks!

Using the code

CRectTrackerCS 2.1 is very easy to use.

Create an instance and initialize it:

CRectTrackerCS TestRubberBand = new CRectTrackerCS();
TestRubberBand.Create();

On the MouseDown event:

TestRubberBand.StartPoint(this, e);

On MouseUp event:

TestRubberBand.EndPoint(this, e);

On MouseMove event:

TestRubberBand.TrackRubberBand(this, e);

On Paint event:

TestRubberBand.DrawRubberBand(this, e);

And last, don't forget to free up the resources:

TestRubberBand.Destroy();

CRectTrackerCS has four attributes (Read Only): X, Y, Width, Height. Add a StatusStrip control, and in the MouseMove event:

toolStripStatusLabel1.Text = "RubberBand:"+" X="+ 
   TestRect.X.ToString() + " Y="+TestRect.Y.ToString() + 
   " Width="+TestRect.Width.ToString() + 
   " Height="+TestRect.Height.ToString();

The StatusStrip control will now show the rubber band's attributes.

Tip: If you want the rubber band streamed in a Form, you need to add a Timer control and in the Tick event:

this.Invalidate(null, true);

or use InvalidateRectangle(), which is a new method in CRectTrackerCS 2.1:

this.Invalidate(TestRubberBand.InvalidateRectangle(), true);

CRectTrackerCS 2.1 --- What's new

Three methods have been added: InvalidateRectangle, SetRubberBandStyle (+2 overloads), and LoadDefaultRubberBandStyle. You can change the style and color of the rubber band and the ResizePin.

Here are the StyleFlags of CRectTrackerCS 2.1: ResizePinNoHide, ResizePinAutoHide, ResizePinAlwaysHide, SolidLine, DottedLine.

That's it!

All suggestions, ideas, bug reports, and criticisms are welcome!