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Re: BLT Problems
From: |
Todd Allen |
Subject: |
Re: BLT Problems |
Date: |
Sun, 29 Dec 1996 09:56:16 -0500 |
I made the change to ActiveGraph.m suggested below, and then did a 'make
clean' and a 'make' in the swarm directory to rebuild the swarm
libraries, and then did the same in the HeatBugs directory. I still get
the same errors. I should also mention that the graphBug and addHeatbug
buttons don't see to be working. When I click on them I just get a beep
and nothing else happens. This may indicate that the problems extend
beyond BLTVector. Any other suggestions?
Todd Allen
glen e. p. ropella wrote:
>
> Todd,
>
> I'm not sure if this might be why or not. I've been using Slackware
> for a while (with the 1.2.13 and with the 2.0.0 kernels with gcc
> 2.7.2, etcetc) and I've never seen this.
>
> Anyway, what I think is happening is that heatbugs has a call to the
> "-step" method on an ActiveGraph, which then calls the "-addX:
> (double) x Y: (double) y" method on a GraphElement in BLTGraph, which
> then calls the "-append" method on a BLTVector.
>
> The call to addX:Y: (in ActiveGraph.m) looks like:
>
> [element addX: getCurrentTime() Y: [self doubleDynamicCallOn: dataFeed]];
>
> Now, getCurrentTime() probably returns an unsigned integer because
> it's defined in activity.h as:
>
> typedef unsigned timeval_t; // type for time values
>
> This means that the first arguement for addX is the wrong type.
> So, you might try changing the addX call to:
>
> [element addX: (double) getCurrentTime() Y: [self doubleDynamicCallOn:
> dataFeed]];
>
> And see if the problem goes away. I doubt it will. But, who knows.
> The reason I doubt it is because I have no idea why it would balk at
> the append method on BLTVector instead of higher up in the stack. If
> presented with the circumstance without the error message, I would say
> that it would fail to find the "-addX: (unsigned) x Y: (double) y"
> method and the error message would say:
>
> GraphElement does not respond to method addX
>
> Anyway, give it a shot and let me know how it goes.
>
> glen
>
> > I have been trying to get swarm working for weeks. I think I'm close to
> > having it working, but it's still not quite right.
> >
> > I am runing Red Hat 3.0.3 Linux kernel 1.2.13 on a Pentium Pro 200
> > machine.
> >
> > I have installed all of the required libraries. There did not appear to
> > be any errors during the install process. The swarm libraries and the
> > sample apps also appeared to compile without incident. The problems
> > occur when I run the sample apps. For example, when I run heatbugs, the
> > message,
> >
> > BLTVector does not respond to method append
> >
> > appears repeatedly in the xterm window from which I executed heatbugs,
> > and the 'happiness of bugs vs. time' graph is not displayed when the go
> > button is pressed. On the up side, the heatbugs seem to be scampering
> > around properly in their window.
> >
> > What am I doing wrong? I have been through the entire install process
> > no fewer than five times with exactly the same result.
> >
> > Thanks,
> >
> >
> > Todd Allen