Drawing Tablet Library For Processing

marcus • March 18th, 2008

libTablet aims at becoming a (cross-platform) Java drawing tablet library that plays nice with Processing. It gives you easy access to your tablets pressure, tilt and rotational data in your sketches/ Java applications.

Since my most immediate requirement currently is to have it working on Mac OS X, it is yet not really cross-platform. However the plan is to wrap JTablet on Windows to provide a common interface for easier development/ deployment across these systems.

Releases

version 0.1

first draft, mac os x only
» Tablet-0.1.zip

Source

svn co http://svn.infostuka.org/rep/libTablet/trunk/

Useage

Simply create a PTablet object before you initialize your sketch, which you can then use to query your tablet for: pressure, tiltX, tiltY, rotation etc.

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import processing.opengl.*;
import infostuka.lib.tablet.p5.*;

PTablet tablet;

void setup ()
{
    // ATTENTION - new PTablet() HAS to be created before calling size()
    tablet = new PTablet(this);
    size(800, 600, OPENGL);
}

void draw ()
{
    if (mousePressed) {
        float brushSize = tablet.pressure * 100f;
    System.out.println("TILT " + tablet.tiltX + " " + tablet.tiltY + " ROT " + tablet.rotation + " THETA " + theta);
    ...
    your drawing commands here
    ...
    }
}

License

Copyright © Marcus Wendt 2008
This library is licensed under the GNU LGPL

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spherical linear interpolation on a circle

marcus • March 3rd, 2008

how to do a slerp with angles?
that caused me some headache this morning. however, the solution is blatantly simple.
» example sketch

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float angleSlerp(float cur, float to, float delta)
{
  if(cur < -HALF_PI && to > HALF_PI) {
    cur += TWO_PI;
  } else if(cur > HALF_PI && to < -HALF_PI) {  
    cur -= TWO_PI;
  }
  return cur * (1-delta) + to*delta;
}

eclipse europa

marcus • August 11th, 2007

this is probably a few days old news but anyway … the eclipse foundation’s europa packages are officially released. download here!

Eclipse Europa is the annual release of Eclipse projects. Like last year’s Callisto release, the Europa release is a coordinated release of different Eclipse project teams. This year, the annual release includes 21 projects. By releasing these projects at the same time, the goal is to eliminate uncertainty about version compatibility and make it easier to incorporate multiple projects into your environment.

i was pleasantly surprised to discover the new dynamic languages toolkit project that is included in the default java distribution. a good reason to have another go at my jruby experiments soon. (after some initial success with writing opengl processing sketches in ruby i gave up this idea since the lack of IDE integration was just too annoying…)

Collada Export Plugin for Processing

marcus • August 8th, 2007

libCollada allows you to easily export 3D geometry and material data in the COLLADA 1.4.1 format from your processing applications. Although processing’s drawing methods and COLLADA’s scenegraph based, more complex 3D description format, do not match directly – the library attempts to do a reasonable conversion, requiring no extra API to learn.

Releases

version 0.2

now creates materials & effects generated from standard p5 drawing commands
» collada-0.2.zip

version 0.1

first public release with examples and packaged for p5
» collada-0.1.zip

version 0.01 (08/06/07)

a first rather rough version that can export basic geometry data.

Source

svn export http://svn.infostuka.org/rep/libCollada/trunk/

Useage

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import processing.opengl.*;
import infostuka.collada.p5.*;

void setup() {
  size(400, 400, OPENGL);
}


void keyPressed() {
  if (key == ' ') {
    record = true;
  }
}


void draw ()
{
    if (record) {
        beginRecord(P5ColladaExport.DAE, "output.dae");
    }

    // ... your drawing operations here ...

    if (record) {
        endRecord();
        record = false;
    }
}

Examples

• Point Cloud

Related

• Collada Official Homepage
• Collada Wikipedia
• Feeling Software – Free Collada Plugin for Maya and 3DStudio MAX
• Blender.org – excellent opensource 3D DCC

License

Copyright © Marcus Wendt 2007
This library is licensed under the GNU LGPL

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