Processing 1.0 - Processing Discourse

We closed this forum 18 June 2010. It has served us well since 2005 as the ALPHA forum did before it from 2002 to 2005. New discussions are ongoing at the new URL http://forum.processing.org. You'll need to sign up and get a new user account. We're sorry about that inconvenience, but we think it's better in the long run. The content on this forum will remain online.

Index › Programming Questions & Help › Syntax Questions › create picture

‹ Previous Topic | Next Topic ›

Pages: 1

create picture (Read 794 times)

xyz

create picture
Apr 27^th, 2009, 3:49am

Hello,
how it is possible to create a 2D picture from this file:
39 18.378 59.466 13.185
40 14.270 54.556 18.227
41 30.119 51.333 33.732
43 26.326 51.100 21.154
44 23.764 55.050 18.338
45 17.697 75.884 26.178
48 22.351 66.269 28.727
49 19.980 63.046 33.535

The first integer is the point label and the three double are the coordinates.

Exist anywhere an example to do this?

Thank you in advance.

seltar

Re: create picture
Reply #1 - Apr 27^th, 2009, 4:50am

you need to load the file into a String array with loadStrings("filename.txt");
then you need to manipulate each line so you get the numbers out seperately.
then you need to run a Float.toFloat() on the different stringed numbers, to turn them into doubles, and store that in another array.
then you draw them.

Something like this
[code]
String[] s = loadStrings("file.txt");
float[][] numbers = new float[s.length][4];
for(int i = 0; i < s.length; i++){
String[] line = splitTokens(s[i]);
for(int j = 0; j < line.length; j++){
numbers[i][j] = Float.toFloat(line[j]);
}
}

beginShape();
for(int i = 1; i < numbers.length; i++){
vertex(numbers[i-1][1],numbers[i-1][2],numbers[i-1][3]);
}
endShape();
[code]

I'm bored, therefore I program
http://seltar.org > seltar's special place
http://snippet.seltar.org > seltar's snippet palace
http://libraries.seltar.org > seltar's libraries

xyz YaBB Newbies Offline Posts: 10	Re: create picture Reply #2 - May 1^st, 2009, 1:15am Thank you for your code, but unfortunately I get with processing 1.0.3 this error: The function toFloat(String) does not exist. What can I do?

PhiLho YaBB Moderator Offline Posts: 4190 Near Paris (France)	Re: create picture Reply #3 - May 1^st, 2009, 2:34am That's Float.parseFloat(), but you have to catch an exception. Just use Processing's float() function instead, it will do that for you.

xyz YaBB Newbies Offline Posts: 10	Re: create picture Reply #4 - May 1^st, 2009, 3:36am Thank you, float() works, but now I get this error: vertex() with x, y, and z coordinates can only be used with a renderer that supports 3D, such as P3D or OPENGL. Use a version without a z-coordinate instead. I think I need P3D. How can I solve this problem?
	« Last Edit: May 1^st, 2009, 5:07am by xyz »

PhiLho YaBB Moderator Offline Posts: 4190 Near Paris (France)	Re: create picture Reply #5 - May 1^st, 2009, 5:32am xyz wrote on May 1^st, 2009, 3:36am: I think I need P3D. How can I solve this problem Well, just use P3D! Look at size()

xyz

Re: create picture
Reply #6 - May 1^st, 2009, 7:32pm

Now I get only an empty window, but without points with this code:
Code:

void setup() {
  size(screen.width, screen.height,P3D);
}

String[] s = loadStrings("file.txt");
float[][] numbers = new float[s.length][4];
for(int i = 0; i < s.length; i++){
 String[] line = splitTokens(s[i]);
 for(int j = 0; j < line.length; j++){
   numbers[i][j] = float(line[j]);
   
 }
}

void draw(){
  beginShape();
    for(int i = 1; i < numbers.length; i++){
     vertex(numbers[i-1][1],numbers[i-1][2],numbers[i-1][3]);
    }
  endShape();
}

What do I wrong?

« Last Edit: May 2^nd, 2009, 4:30am by xyz »

Pages: 1

‹ Previous Topic | Next Topic ›