drawing line on webbrowser toool

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C#

Is there no way to draw a line in webBrowser control in C#?

WebBrowser is open on google earth.

Thanx for any help.

Posted 8-Jan-11 23:31pm

Mostafa Elsadany

Updated 9-Jan-11 8:20am

Dalek Dave

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thatraja 9-Jan-11 5:35am

Clear your question little bit please

Dalek Dave 9-Jan-11 14:20pm

Edited fro GRammar and Clarity.

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Espen Harlinn · Answer 1 · 2011-01-08T23:48:00

1. Render to to png with transparent background
2. Display png in <img /> and use that as an overlay (same position as map element, but higher zorder)

You can use System.Drawing.Graphics to create the png - possibly using a web handler.

If you are using the System.Windows.Forms.WebBrowser control you can interact with the IWebBrowser2 interface through the WebBrowserBase.ActiveXInstance. WebBrowser is derived from WebBrowserBase.

You should be able to use the handle of the System.Windows.Forms.WebBrowser to enumerate it's children, subclass and listen for mouse events. This is obviously is getting fairly convoluted, and you can hopefully get away with something simpler.

To give you anything more meaningful, I'll have to know more about what you are trying to achieve.

You can use this article as a starting point:
Thumbnailer HTTP Handler[^]

Regards
Espen Harlinn

DaveyM69 · Answer 2 · 2011-01-09T05:19:00

As you said in comments to Espen's answer, there is no MouseMove event in the WebBrowser control.

It's easy enough to reimplement this hidden event by subclassing the control. I have no idea if this will enable you to solve your primary issue though!

C#

public class MyWebBrowser : WebBrowser
{
    public new event MouseEventHandler MouseMove;

    protected override void OnMouseMove(MouseEventArgs e)
    {
        MouseEventHandler eh = MouseMove;
        if (eh != null)
            eh(this, e);
    }
}

drawing line on webbrowser toool

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