Re: About Canvas

[Alessandra Cassar]

Hi,
I am not sure it helps you, but I had a similar problem and  Benedikt 
Stefansson suggested me to look at this "template code".

http://www.santafe.edu/projects/swarm/users/user-community.html#use

  GraphLib-1.2.tar.gz, a limited graph library with two demo apps: 
Bank-1.2.tar.gz and DynamicGraph-1.2.tar.gz 

Alessandra

On Fri, 18 Sep 1998, xueyue wrote:

> I wanted to test Canvas widget but fail to display
> two nodes with a link on
> the Canvas with the following code. The Canvas
> window is displayed but 
> no nodes and link. My understanding is: (1) I first create two nodes
> (aNodeItem1 and a NodeItem2)
> using [NodeItem ....] and then  create the link using
> [LinkItem ...], I then put 
> these items into canvas, and 
> finally [Canvas pack] to display. But failed, (compiling was
> successful). I guess I did not use them correctly. Could anyone point
> the errors out?
> Many thanks!
> 
> ---Code--------------------
> 
> 
>  aCanvas = [Canvas create: self];
>  [aCanvas setWindowTitle: "Canvas"];
>  [aCanvas setWidth: 100];
>  [aCanvas setHeight: 100];
>  [aNodeItem1 setX: 30 Y: 40];
>  [aNodeItem1 setColor: "red"];
>  [aNodeItem1 setBorderWidth: 3];
>  [aNodeItem1 setString: "A"];
>  [aNodeItem1 createEnd];
>  [aNodeItem2 setX: 50 Y: 60];
>  [aNodeItem2 setColor: "red"];
>  [aNodeItem2 setBorderWidth: 3];
>  [aNodeItem2 setString: "B"];
>  [aNodeItem2 createEnd];
>  [aLinkItem setFrom: aNodeItem1];
>  [aLinkItem setTo: aNodeItem2];
>  [aLinkItem setColor: "blue"];
>  [aLinkItem update];
>  [aLinkItem createEnd];
> [aCanvasItem setCanvas: aCanvas];
>  [aCanvasItem setTargetId: a 
>  [aCanvasItem createEnd];
>  [aCanvas pack];
>   
> -- 
> Dr Xueyue Huang
> Center for Transport Studies
> Imperial College 
> London SW7 2BU
> 
> (+44) 171 594 6037

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