MouseMove() event handler

Question

0.00/5 (No votes)

See more:

Hi guys. I'm trying to pan an image that I drew to a panel. The thing is in order to pan it, I need to keep track of the mouse location once the user pressed down the left mouse button and move the button.

Well, the problem is when the mouse moves how can I determine the start and end location of the mouse? If it was a mouse down event, I could get the starting location when the mouse is pressed and the end location when it is released. But with the mouse move action, how can one tell the start and end of these small movements that I'm making???

Here is my code if it helps to see what I'm talking about

private void PanPanel_MouseMove(object sender, MouseEventArgs e)
{
        if(e.Button == MouseButtons.Left)
        {
            panStartPoint = e.Location;
            panEndPoint = .... // how do I get this point?
        }

}

Posted 25-Jul-10 22:08pm

Bezawit

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

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

Sauro Viti · Answer 1 · 2010-07-25T22:32:00

Solution 1

You should handle 3 events:

MouseDown: in the event handler you save the starting position for the pan
MouseMove: in the event handler you update the view on screen
MouseUp: in the event handler you process the pan using the current mouse position and the one previously saved

Posted 25-Jul-10 22:32pm

Sauro Viti

OriginalGriff · Answer 2 · 2010-07-25T22:38:00

Use MouseDown to start the move - mark that you are moving, start location
Use MouseMove to pan the control, if MouseDown has happened.
Use MouseUp to end the pan.

[edit]
Sorry, that was a little blunt. It has all the info you need, but could be better explained.

On MouseDown, you mark that you are moving and record the position at which you started.

On MouseUp, you mark you are not moving any more.

On MouseMove, check if you are moving, and if so adjust the image position by the difference between the start and the current position (or the last position and the current - up to you).

You will get a lot of mouse moves, each with the new current position.
[/edit]