Data visualization – sketch set-up error

Processing Coding Questions
1

Hi there, I am building a very simple sketch to visualize text and data.

It works when is like this(see below), but not when I use void setup and void draw (see second option after). does anyone know why? Thanks!

String filename= "test1.csv";
String [] sentence;
PFont f = createFont("Helvetica", 40);
 size(500,500);
 sentence=loadStrings(filename);
 printArray(sentence);
  textFont(f);
  textSize(40);
  text(sentence[1], 10, 100);

String filename= "test1.csv";
String [] sentence;
PFont f = createFont("Helvetica", 40);

void setup() {
 size(500,500);
 sentence=loadStrings(filename);
 printArray(sentence);
}

void draw(){
  textFont(f);
  textSize(40);
  text(sentence[1], 10, 100);
}
2

What happens falsely, does it start, does it throw an error?

Maybe move this

f = createFont(“Helvetica”, 40);

Into setup after size

3

as you use a .csv file i assume you would be better of using
https://processing.org/reference/loadTable_.html
instead of
https://processing.org/reference/loadStrings_.html

anyhow

String filename= "test1.csv";
String [] sentence;
sentence=loadStrings(filename);
printArray(sentence);

works with the data file in
/data/test1.csv

same as

String filename= "test1.csv";
String [] sentence;

void setup() {
size(500,500);
sentence=loadStrings(filename);
printArray(sentence);
}

void draw(){}
4

Yes, the error it gives is:
java.lang.reflect.InvocationTargetException

1 Like
5

So no createFont before setup, instead after size

Before setup

PFont f ;

In setup() (after size() command)

f = createFont(“Helvetica”, 40);

1 Like
6

Yes, is the csv file located in your data folder?

7

Great! That works! Thanks:)

1 Like
8

I think a few things are set up in the size() command behind the scenes.

Hence some commands only work after size(), especially file related stuff and width and height…

9

Yes, while it isn’t strictly enforced, the Processing documentation actually says must:

In a program that has the setup() function, the size() function MUST be the first line of code inside setup() , and the setup() function must appear in the code tab with the same name as your sketch folder. size() / Reference / Processing.org

10

I know Processing since v1.5.1. Even back then, that wasn’t a MUST. :laughing: