Processing Forum

Screen name:
josephinejost.com
About Me:
Designer, Artist, Mum. Co-Founder / Designer at 8 Pixeldrops
Website:
http://www.josephinejost.com
Twitter Link:
https://twitter.com/josephinejost
Facebook Link:
https://www.facebook.com/pages/Josephine-Jost/121924444540179

josephinejost.com's Profile

2 Posts

10 Responses

0 Followers

Activity Trend

Last 30 days

Loading Chart...

Show:

Expanded view
List view

Changing source image in between a sequence

[13 Replies]
- 10-Jul-2012 05:46 AM
- Forum: Programming Questions
I've got this Pointillism code, just wondering if there's a way to switch the image that is processed/referenced half way through the sequence:

// Learning Processing

// Daniel Shiffman

// http://www.learningprocessing.com

// Example 15-14: "Pointillism"

PImage img;

int pointillize = 15;

void setup() {

size(800,500);

img = loadImage("20.JPG");

background(255);

smooth();

}

void draw() {



// Pick a random point

int x = int(random(img.width));

int y = int(random(img.height));

int loc = x + y*img.width;



// Look up the RGB color in the source image

loadPixels();

float r = red(img.pixels[loc]);

float g = green(img.pixels[loc]);

float b = blue(img.pixels[loc]);



// Back to shapes! Instead of setting a pixel, we use the color from a pixel to draw a circle.

noStroke();

fill(r,g,b,90);

rect(x,y,pointillize,pointillize);

saveFrame("/output/seq-####.jpg");

}

Facebook Graph API

[8 Replies]
- 20-Jun-2012 09:07 AM
- Forum: Programming Questions
Hi, I want to integrate my own facebook profile into Processing using the Graph API, to create something like this: http://www.youtube.com/watch?v=ZL62fF6Uzjo

Here is the code I'm using:

// application api key and secret

String fbApiKey = "mykey";

String fbApiSecret = "mysecretapi";

// a comma separated (no spaces!) list of user ids

String fbUserIDs = "myid";

/* other settings */

//

// Facebook RESTful API

String fbRestServer = "";

String fbRestNode = "";

XMLElement[] usersXml;

int currentUser = 0;

void setup ()

{

size( 300, 200 );

// the details / params in here define what will be read, see:

// http://wiki.developers.facebook.com/index.php/Users.getInfo

String xmlResponse = fbCallMethod( new String[] {

"method=facebook.Users.getInfo",

"uids=" + fbUserIDs,

"fields=uid,first_name,last_name", // see link above for more options

"format=XML"

});

if ( xmlResponse == null ) // an error occured

{

exit();

return;

}

XMLElement xml = new XMLElement( xmlResponse );

usersXml = xml.getChildren( "user" );

fill( 0 );

textFont( createFont( "sans-serif", 24 ) );

textAlign( CENTER );

frameRate( 1 );

}

void draw ()

{

background( 255 );

String full_name = usersXml[currentUser].getChild("first_name").getContent();

full_name += " " + usersXml[currentUser].getChild("last_name").getContent();

text( full_name, width/2, height/2 );

currentUser++;

currentUser %= usersXml.length; // modulo, wrap around

}

/**

* Place a Facebook call (GET request) using Processing API ( loadStrings(), join() )

*/

String fbCallMethod ( String[] args )

{

String[] params = new String[args.length + 3];

System.arraycopy( args, 0, params, 0, args.length );

params[params.length-3] = "api_key=" + fbApiKey;

params[params.length-2] = "call_id=" + System.currentTimeMillis();

params[params.length-1] = "v=1.0";

String sig = fbGenerateSIG ( params );

String paramString = join( params, "&" ) + "&sig=" + sig;

String[] lines = loadStrings( fbRestServer + fbRestNode + "?" + paramString );

if ( lines == null )

{

println( "OUCH, nothing to read from that URL:\n" + fbRestServer + fbRestNode + "?" + paramString );

return null;

}

String response = join( lines, "\n" );

return response;

}

/**

* Generate a call signature, see:

* http://wiki.developers.facebook.com/index.php/How_Facebook_Authenticates_Your_Application

* http://wiki.developers.facebook.com/index.php/Authorization_and_Authentication_for_Desktop_Applications

*/

String fbGenerateSIG ( String[] args )

{

java.util.Arrays.sort( args );

String argString = join( args, "" );

argString += fbApiSecret;

return md5Encode( argString );

}

/**

* MD5 encode a String using Processing API ( hex() )

*/

String md5Encode ( String data )

{

java.security.MessageDigest digest = null;

try {

digest = java.security.MessageDigest.getInstance("MD5");

}

catch ( java.security.NoSuchAlgorithmException nsae ) {

nsae.printStackTrace();

}

digest.update( data.getBytes() );

byte[] hash = digest.digest();

StringBuilder hexed = new StringBuilder();

for ( int i = 0; i < hash.length; i++ )

{

hexed.append( hex( hash[i], 2 ) );

}

return hexed.toString().toLowerCase();

}

And the Error messages I get:

java.lang.IllegalArgumentException: Prefix string too short

at java.io.File.createTempFile(File.java:1782)

at java.io.File.createTempFile(File.java:1828)

at processing.app.Base.createTempFolder(Base.java:1566)

at processing.app.Sketch.makeTempFolder(Sketch.java:1112)

at processing.mode.java.JavaBuild.build(JavaBuild.java:135)

at processing.mode.java.JavaMode.handleRun(JavaMode.java:176)

at processing.mode.java.JavaEditor$20.run(JavaEditor.java:481)

at java.lang.Thread.run(Thread.java:662)

«Prev
Next »