GeoLocation

morrow.li..

in Contributed Library Questions • 1 year ago

I'm trying to run this script, but processing is telling me that the getGeoLocation() does not exist. Can anyone explain why?

Twitter myTwitter;
void setup() {
myTwitter = new Twitter("user", "pass");
try {
twitter4j.Query query = new twitter4j.Query("revolution");
query.setRpp(100);
QueryResult result = myTwitter.search(query);
ArrayList tweets = (ArrayList) result.getTweets();
for (int i = 0; i < tweets.size(); i++) {
Tweet t = (Tweet) tweets.get(i);
String user = t.getFromUser();
String msg = t.getText();
Date d = t.getCreatedAt();
//////////////////////////////////////////HERE/////////////////////////////////////////////////
GeoLocation geoloc = t.getGeoLocation();
///////////////////////////////////////////////////////////////////////////////////////////////////////////
try {
double lat = geoloc.getLatitude();
println("latitude: " + lat);
}
catch (Exception e) {
println(e.getMessage());
println("no latitude");
}
try {
double lon = geoloc.getLongitude();
println("longitude: " + lon);
}
catch (Exception e) {
println(e.getMessage());
println("no longitude");
}
println("Tweet by " + user + " at " + d + ": " + msg);
};
}
catch (TwitterException te) {
println("Couldn't connect: " + te);
};
};
void draw() {
};

Replies(15)

PhiLho

Contributed Library Question (moved). And I don't see your import statement, so I don't know what library you use.
Well, looking closely, I see twitter4j.Query, but all the other declarations are unqualified, so they will fail if you don't have an import statement.

PS.: No need for semi-colons after closing braces.

morrow.li..

Re: GeoLocation

1 year ago

Is there a way to get an import statement for twitter4j? It isn't really a processing library, I just dragged the .jar onto the sketch.

Edit:

I changed to

twitter4j.GeoLocation geoloc = t.getGeoLocation();

The geolocation works, but now it says the function getGeoLocation(); dosen't exist. I don't get it. Can you please explain?

http://twitter4j.org/en/javadoc/index.html?twitter4j/GeoLocation.html

Thank you,

PhiLho

Re: GeoLocation

1 year ago

The Import Library feature, and the "drag jar to PDE" trick, should work for any Java library, for Processing or not.
But if you follow examples, just copy their import statements.
Otherwise, the answer is in the JavaDoc you point to:
java.lang.Object
< extended by twitter4j.GeoLocation
so the import statement is:
import twitter4j.*;
which should take care of all other classes at the same level.
Depending on the classes you use, you might also need to import twitter4j.api.*, twitter4j.util.* and so on.

morrow.li..

Re: GeoLocation

1 year ago

You probably answered my question but I don't really understand.

twitter4j.GeoLocation geoloc = t.getGeoLocation();

It still says says the function getGeoLocation(); dosen't exist, even after I properly imported.

java.lang.Object < extended by twitter4j.GeoLocation

I know this is probably a really dumb solution but I don't understand what it is saying? Can you clarify? Thank you for all of your help.

PhiLho

Re: GeoLocation

1 year ago

Let's go back to bases: have you put the library at the right place?

morrow.li..

Re: GeoLocation

1 year ago

Yeah, it show up in the sketch's code folder.

PhiLho

Re: GeoLocation

1 year ago

I don't see a getGeoLocation() from the http://twitter4j.org/en/javadoc/twitter4j/Twitter.html page, so this method cannot be used with a Twitter object. Either you made a mistake or you took wrong or obsolete code.

morrow.li..

Re: GeoLocation

1 year ago

Is there some other way to call the information or do I just go straight to the getLatitude/getLongitude? I tried changing to this and it tells me that getLatitude doesn't exist.

for (int i = 0; i < tweets.size(); i++) {
Tweet t = (Tweet) tweets.get(i);
String user = t.getFromUser();
String msg = t.getText();
Date d = t.getCreatedAt();
try {
double lat = t.getLatitude();
println("latitude: " + lat);

}

toxmeister

Re: GeoLocation

1 year ago

Hi,

You don't need a manual import if:

1) you have created a "code" folder inside your sketch folder and

2) placed the twitter4j-core jar in there

Also phi.lho, getGeoLocation() is a method of the Tweet class, not the Twitter facade and it does exist. Below is a simple working example done during a workshop at HEAD Geneva last year, updated to work with the current twitter4j release (2.2.1).

import toxi.geom.*;
import toxi.processing.*;
import processing.opengl.*;
final String SEARCH_QUERY="spring";
final int TIME_STEP = 1;
final int NUM_SEARCHES = 5;
// number of ms per day
final long DAY_DURATION = 1000*60*60*24;
Twitter twitter = new TwitterFactory().getInstance();
HashMap<Long,Tweet> tweets=new HashMap<Long,Tweet>();
ToxiclibsSupport gfx;
void setup() {
size(1024,700,OPENGL);
gfx=new ToxiclibsSupport(this);
searchTwitter(SEARCH_QUERY);
}
void searchTwitter(String searchQuery) {
Query query = new Query(searchQuery);
query.rpp(100);
Date referenceDate=new Date();
for(int i=0; i<NUM_SEARCHES; i++) {
String d=new SimpleDateFormat("yyyy-MM-dd").format(referenceDate);
println("executing search for date: "+d);
query.until(d);
// execute search
try {
QueryResult result = twitter.search(query);
for (Tweet tweet : result.getTweets()) {
// first check if ID is unique?
if (tweets.get(tweet.getId())==null) {
// filter out tweets with GPS loc
GeoLocation loc=tweet.getGeoLocation();
if (loc!=null) {
tweets.put(tweet.getId(),tweet);
println("adding tweet: "+tweet);
}
} else {
println("skipping: "+tweet.getId());
}
}
}
catch(TwitterException e) {
println(e.getMessage());
}
referenceDate.setTime(referenceDate.getTime()-TIME_STEP*DAY_DURATION);
}
}
void draw() {
background(0);
fill(255);
lights();
translate(width/2,height/2,0);
rotateX(mouseY*0.01);
rotateY(mouseX*0.01);
gfx.origin(300);
sphere(200);
// iterate over all collected tweets
for(Tweet tweet : tweets.values()) {
GeoLocation loc=tweet.getGeoLocation();
// convert geo location into cartesian world coordinates
Vec3D p=new Vec3D(200,radians((float)loc.getLongitude())-HALF_PI,radians((float)loc.getLatitude())).toCartesian();
// create a box at the computed position
AABB box=new AABB(p,2);
noStroke();
fill(255,0,0);
// draw box at position
gfx.box(box);
}
}

For more GPS mapping related code also see this thread:

http://forum.processing.org/topic/gps-to-spherical-coordinates-with-vec3d-toxilibs#25080000000756005

http://postspectacular.com | http://toxiclibs.org

PhiLho

Re: GeoLocation

1 year ago

"Also phi.lho, getGeoLocation() is a method of the Tweet class, not the Twitter facade and it does exist"
Yes, my bad, I was confused by Twitter, Tweet, and similar...

In my defense, I haven't used this API yet.

toxmeister

Re: GeoLocation

1 year ago

Can you please download the latest version of the twitter4j library then?

http://twitter4j.org/en/index.html#download

Unzip and then copy the "twitter4j-core-2.2.1.jar" (in the "lib" subfolder) into the "code" subfolder of your sketch...

morrow.li..

Re: GeoLocation

1 year ago

I got that and that fixed that problem, but now there's another error. It says the type query is ambiguous.

PhiLho

Re: GeoLocation

1 year ago

Put back the twitter4j.Query then, that's probably why it was there.
Not sure with what it is conflicting, though. Reporting full error messages is useful, you know.

morrow.li..

Re: GeoLocation

1 year ago

I went back to the beginning with toxmeister's script and uploaded all the libraries. I'm not having any of the previous problems, but now processing is highlighting the hashmap.

I tried this

HashMap(Long,Tweet) tweets=new HashMap(Long,Tweet)();

and this was the original

HashMap<Long,Tweet> tweets=new HashMap<Long,Tweet>();

Either way i get this error. I hope uploading the full error helps.

expecting SEMI, found 'tweet'

processing.app.debug.RunnerException: Syntax error, maybe a missing semicolon?

at processing.app.Sketch.preprocess(Unknown Source)

at processing.app.Sketch.build(Unknown Source)

at processing.app.Editor$DefaultRunHandler.run(Unknown Source)

at java.lang.Thread.run(Thread.java:619)

morrow.li..

Re: GeoLocation

1 year ago

got it working thanks so much for all your help

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