Processing 1.0 - Processing Discourse - Bug in the Graph Layout example

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Bug in the Graph Layout example (Read 1836 times)

foxxjnm

Bug in the Graph Layout example
May 25^th, 2008, 2:25am

Hello,

I found a small bug the code for the Graph Demo in chapter 8 of Visualizing Data.

In the setup() function loadData() is called before textFont() which causes an error in the Node class when it tries to call textWidth().

Here is the corrected version:

void setup() {
size(600, 600);
font = createFont("SansSerif", 10);
textFont(font);
loadData();
println(edgeCount);
smooth();
}

Thanks,

Jason

Scott Murray

Re: Bug in the Graph Layout example
Reply #1 - Nov 13^th, 2008, 7:54pm

Thanks for posting this, Jason. I'm just experimenting with the graph layout example and, for what it's worth, I didn't get that error.

I am, however, seeing weird behavior in which the relax() layout is causing all the nodes to squish together too close to each other horizontally, making the layout too vertical. See this image:

http://alignedleft.com/projects/2008/graph-layout.png

Weird, right? I have double-checked that I typed the code exactly as written in the book. Any thoughts? I would expect something more balanced, as in the screenshot on page 229.

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