Re: [xwt-users]2D drawing capability

> Hi,
> 1. I just started using xwt for an application and wanted to know if it
> has any 2D line drawing feature on surfaces. I need to connect two images
> with a line and would appreciate it if someone lets me know the best way
> to do it using xwt.

Nitrogen (currently the 'unstable' XWT) has basic SVG support that
provides this kind of functionality.

Using the current stable series, you could draw a line using thin boxen
put together orthogonally as a line (enter crude diagram):
_____
     |______


> 2. When the application is loaded in the engine, is there a way to call
> the server without waiting for an event to happen (similar to the onLoad
> using javascript)?

Yes, just put it directly into the code.  The way a .xwt instantation
works is that it simply forms anything XML and then executes any
ECMAscript in that XML.  Trap assignments (_trap) are just that,
assignments being made by executed code.  Hence you can assign traps
anywhere in your ECMAscript.

<template>

    xwt.println( "5! = " + ( 1 * 2 * 3 * 4 * 5 ) );

    _trap = function( t ) {
        if ( t )
            xwt.println( "This is a trap!" );
        else {
            _trap = function() { xwt.println( "I've been replaced!" ); }
        }
    }

    trap = true;
    trap = false;
    trap = true;

</template>

Log output for the above:

5! = 120
This is a trap!
I've been replaced!

So to execute something straight away in the template, you put it in the
<templace /> scope (or another <box /> scope) rather than the scope of a
trap or function.

- Charlie

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