Processing Forum

How to set the initial position of the sketch window?

[1 Reply]
- 02-Oct-2013 12:40 AM
- Forum: General Discussion
Is it possible to specify the position of the sketch window, so when it starts the window appears at say (x:100, y:100) on the display?

Any help will much appreciated

Is it possible to do drag and drop files to a P5 sketch?

[2 Replies]
- 23-Sep-2013 04:53 AM
- Forum: General Discussion
I would like to know if is possible to say for example drag and drop an image file to a running Processing Sketch and show the image on it, if so can you show me an example?

How to save a PDF from a specific area of the app window?

[4 Replies]
- 11-Sep-2013 01:32 PM
- Forum: Core Library Questions
I would like to create a PDF file from a specific rectangle area of my app window, is ti possible?

Any help will be much appreciated

How to make a Slider increment by 2 in ControlP5?

[3 Replies]
- 28-Aug-2013 02:41 PM
- Forum: Contributed Library Questions
I need a slider that increment its value by 2 because I need only the odd numbers within a range, any help will be much appreciated

Getting latest toxiclibs build

[8 Replies]
- 09-Aug-2012 02:10 AM
- Forum: Library and Tool Development
Hi,

I lost my version of toxiclibs-0021 and I would like to grab another copy from its repo, I manage to clone it but I dont remember how to build the project so I can use it, any help will be much appreciated

How to change AttractionBehavior's strength and jitter values from a set of particles?

[1 Reply]
- 07-Aug-2012 09:24 AM
- Forum: Contributed Library Questions
I create my particles like this:
1. public void addParticle() {
2. VerletParticle2D p = new VerletParticle2D( Vec2D.randomVector().scale( 5 ).addSelf( width / 2, height / 2) );
3. physics.addParticle( p );
4. physics.addBehavior( new AttractionBehavior( p, 20, attractionStrength, attractionJitter ) );
5. }
I want to be able to change the strength and jitter values of the attraction behaviour at will once the all the particles have been created but I'm not sure how to access the particles behaviour and apply the new values, any help will be much appreciated.
I'm using toxiclibs verletphysics by the way.

Using SublimeText 2 as external editor

[0 Replies]
- 09-May-2012 01:22 AM
- Forum: Integration and Hardware
For those interested in using a different IDE I found SublimeText 2 to be a good substitution for setup details follow this link

OpenFrameworks Quaternion to Toxiclibs Quaternion lost in translation

[1 Reply]
- 27-Feb-2012 06:11 AM
- Forum: Contributed Library Questions
Hi,

I'm having problems trying to translate an OpenFrameworks example to Processing, here is the original OF code (it is a basic arcball example)

https://github.com/obviousjim/OFQuaternionExamples/blob/master/ArcballExample/src/testApp.cpp

And here is my translation using toxiclibs Quaternion class:
1. import toxi.geom.*;
3. Quaternion curRot = new Quaternion( 1, 0, 0, 0 );
5. Vec2D lastMouse = new Vec2D( 0, 0 );
8. void setup() {
9. size( 640, 480, P3D );
10. }
13. void draw() {
14. background( 200 );
16. float[] axisAngle = curRot.toAxisAngle();
18. pushMatrix();
19. translate( width / 2, height / 2, 40 );
20. rotate( degrees( axisAngle[0] ), axisAngle[1], axisAngle[2], axisAngle[3] );
21. noFill();
22. box( 100 );
23. popMatrix();
24. }
27. void mousePressed() {
28. lastMouse.set( mouseX, mouseY );
29. }
32. void mouseDragged() {
33. Vec2D mouse = new Vec2D( mouseX, mouseY );
35. Quaternion yRot = new Quaternion( mouse.x - lastMouse.x, 0, 1, 0 );
36. Quaternion xRot = new Quaternion( mouse.y - lastMouse.y, 1, 0, 0 );
37. Quaternion rot = yRot.multiply( xRot );
39. curRot = curRot.multiply( rot );
41. lastMouse = mouse;
42. }
When I click and drag to rotate weird stuff happens, any ideas how to fix this?

Help on learning how to implement an Arcball style rotation

[3 Replies]
- 17-Feb-2012 03:58 AM
- Forum: Contributed Library Questions
Hi,

I know its been done before and you may say why trying to reinvent the wheel, but I want to learn how to do it by my self so I'm trying to duplicate the functionality of the Arcball class found in the P5 wiki page, I believe I got the bare bone methods to get it working but I'm getting a very weird behaviour

Here is the code:
1. import toxi.geom.*;
3. int axis;
5. float radius;
7. Vec3D center;
8. Vec3D v_down, v_drag;
9. Vec3D[] axisSet;
11. Quaternion q_now, q_down, q_drag;
14. void setup() {
15. size( 640, 480, P3D );
16. // smooth();
18. float x = width / 2.0f;
19. float y = height / 2.0f;
20. float z = min( x, y );
21. center = new Vec3D( x, y, z );
23. radius = -z;
25. v_down = new Vec3D();
26. v_drag = new Vec3D();
28. q_now = new Quaternion();
29. q_down = new Quaternion();
30. q_drag = new Quaternion();
32. axisSet = new Vec3D[] { new Vec3D(1, 0, 0), new Vec3D(0, 1, 0), new Vec3D(0, 0, 1) };
34. axis = -1;
35. }
38. void draw() {
39. background( 200 );
41. q_now = q_drag.multiply( q_down );
43. pushMatrix();
44. translate( center.x, center.y, center.z );
45. rotate( q_now.w, q_now.x, q_now.y, q_now.z );
46. // translate( -center.x, -center.y, -center.z );
48. // Draw down vector
49. stroke( 255, 255, 0 );
50. line( center.x, center.y, center.z, v_down.x, v_down.y, v_down.z );
52. // Draw drag vector
53. stroke( 255, 0, 0 );
54. line( center.x, center.y, center.z, v_drag.x, v_drag.y, v_drag.z );
55. stroke( 60 );
57. noFill();
58. box( 160 );
59. popMatrix();
60. }
63. void mousePressed() {
64. v_down = mouseToSphere( mouseX, mouseY );
65. q_down.set( q_now );
66. q_drag.set( 1, 0, 0, 0 );
67. }
70. void mouseDragged() {
71. v_drag = mouseToSphere( mouseX, mouseY );
72. q_drag.set( v_down.dot( v_drag ), v_down.cross( v_drag ) );
73. }
76. Vec3D mouseToSphere( float x, float y ) {
77. Vec3D v = new Vec3D();
78. v.x = (x - center.x) / radius;
79. v.y = (y - center.y) / radius;
80. v.z = 0;
82. float mag = (v.x * v.x) + (v.y * v.y);
83. if ( mag > 1.0f ) {
84. v.normalize();
85. }
86. else {
87. v.z = sqrt( 1.0f - mag );
88. }
90. println( v );
91. return (axis == -1) ? v : constrainVector( v, axisSet[axis] );
92. }
95. Vec3D constrainVector( Vec3D vector, Vec3D axis ) {
96. Vec3D res = new Vec3D();
97. Vec3D temp = axis.scale( axis.dot( vector ) );
98. temp.subSelf( vector );
99. res.sub( temp );
100. res.normalize();
102. return res;
103. }
I'm looking at all sorts of arcball implementations but I can't see what is wrong with mine, any help will be much appreciated!

How to animate an expanding grid based particle?

[7 Replies]
- 20-Jan-2012 06:36 AM
- Forum: General Discussion
Hi,

I have a grid of squares changing colour on every frame so far so good but I want to make it so when the user clicks on a square this produces a wave like animation of the surrounding squares, the following image illustrates the desired effect.

So the user clicks and the clicked square turns into black and the wave expands fading away, hope that makes sense.

Any ideas will be much appreciated!

Experiencing slow frameRate with GLGraphics

[4 Replies]
- 06-Nov-2011 01:59 AM
- Forum: Contributed Library Questions
The following sketch its running at an avg. of 17fps when I use GLGraphics and GLModel to draw bunch of simple square planes, so I wonder if I'm doing something wrong with my GLGraphics setup.

Here is the main blocks of my sketch, BoxFitter class is not included all it does is claculate the size and positions of each cell in setup()

Main:
1. import javax.media.opengl.*;
2. import java.util.ArrayList;
3. import codeanticode.glgraphics.*;
4. import processing.opengl.*;
5. import toxi.geom.Vec3D;
6. import remixlab.proscene.*;
8. BoxFitter fitter;
9. ArrayList<Cell> cells;
11. int currentSeed = 0;
12. int fitterWidth = 640;
13. int fitterHeight = 480;
15. boolean showWireframes = false;
17. Scene scene;
19. GLTexture textureSource;
21. public void setup() {
22. size( 640, 480, GLGraphics.GLGRAPHICS );
24. // Setup scene
25. scene = new Scene( this );
26. scene.setRadius( 600 );
27. scene.showAll();
28. scene.setAxisIsDrawn( false );
29. scene.setGridIsDrawn( false );
31. // Initialize fitter
32. fitter = new BoxFitter( fitterWidth, fitterHeight, 10, 10, 10 );
33. fitter.make( ++currentSeed );
35. // Initialize boxes
36. cells = new ArrayList<Cell>();
37. createBoxes();
38. }
40. public void draw() {
41. GLGraphics renderer = (GLGraphics)g;
43. background( 0 );
45. for ( int i = 0; i < cells.size(); i++ ) {
46. Cell cell = (Cell)cells.get( i );
47. cell.position.z += -cell.position.z * (cell.sizeD * 0.01f);
49. pushMatrix();
50. translate( -fitterWidth / 2, -fitterHeight / 2, 0 );
51. cell.showWires = showWireframes;
52. cell.display();
54. renderer.beginGL();
55. renderer.model( cell.plane );
56. renderer.endGL();
58. popMatrix();
59. }
61. //println( frameRate );
62. }
64. private void createBoxes() {
65. cells.clear();
67. for ( int i = 0; i < fitter.getNumberOfCells(); i++ ) {
68. int x = fitter.getCellsProperties()[i][0];
69. int y = fitter.getCellsProperties()[i][1];
70. int w = fitter.getCellsProperties()[i][2];
71. int h = fitter.getCellsProperties()[i][3];
72. int c = color( random( 82, 255 ), 30, random( 130, 255 ) );
73. int m = fitter.maxSizer;
75. Cell cell = new Cell( this, w, h, w, c, m );
76. cell.position = new Vec3D( x, y, 600 );
78. cells.add( cell );
79. }
80. }
Cell:
1. public class Cell {
2. PApplet parent;
4. Vec3D position;
5. int sizeW, sizeH, sizeD;
6. int colorTint;
7. int maxSize;
9. boolean showWires;
11. GLModel plane;
13. int[] planeModelIndices = { 0, 1, 2, 0, 3, 2 };
15. Cell( PApplet _parent, int _sizeW, int _sizeH, int _sizeD, int _colorTint, int _maxSize ) {
16. parent = _parent;
17. sizeW = _sizeW;
18. sizeH = _sizeH;
19. sizeD = _sizeD;
20. colorTint = _colorTint;
21. maxSize = _maxSize;
23. showWires = false;
25. // Setup plane
26. plane = new GLModel( parent, 4, GLModel.TRIANGLES, GLModel.STATIC );
28. plane.initIndices( 6 );
29. plane.updateIndices( planeModelIndices );
31. plane.beginUpdateVertices();
32. plane.updateVertex( 0, -sizeW / 2, -sizeH / 2, 0 );
33. plane.updateVertex( 1, sizeW / 2, -sizeH / 2, 0 );
34. plane.updateVertex( 2, sizeW / 2, sizeH / 2, 0 );
35. plane.updateVertex( 3, -sizeW / 2, sizeH / 2, 0 );
36. plane.endUpdateVertices();
38. plane.initColors();
39. plane.beginUpdateColors();
40. plane.updateColor( 0, red( colorTint ), green( colorTint ), blue( colorTint ), 255 );
41. plane.updateColor( 1, red( colorTint ), green( colorTint ), blue( colorTint ), 255 );
42. plane.updateColor( 2, red( colorTint ), green( colorTint ), blue( colorTint ), 255 );
43. plane.updateColor( 3, red( colorTint ), green( colorTint ), blue( colorTint ), 255 );
44. plane.endUpdateColors();
45. }
47. public void update() {
48. }
50. public void display() {
51. //GLGraphics renderer = (GLGraphics)g;
53. if ( showWires ) {
54. stroke( color( colorTint ) );
55. noFill();
56. }
57. else {
58. noStroke();
59. fill( color( colorTint ) );
60. }
62. pushMatrix();
63. translate( position.x + (sizeW / 2), position.y + (sizeH / 2), position.z);
64. //box( sizeW, sizeH, sizeW );
65. //rect( -sizeW / 2, -sizeH / 2, sizeW, sizeH );
67. //renderer.beginGL();
68. //renderer.model( plane );
69. //renderer.endGL();
71. popMatrix();
72. }
73. }
I try calling the renderer begin/endGL inside the cell object thinking that may be the bottle neck so I move it to the main draw() but didn't make any difference.

Any help will be much appreciated

How to create textures from an image?

[6 Replies]
- 02-Nov-2011 06:15 AM
- Forum: Programming Questions
Given the following image I would like to know how to make a texture for a couple of Quads form the squares A and B, I know their coordinates and sizes, any ideas?

EDIT: I think this will give a better explanation of my question, I need to grab the pixels form a square and make a texture out of it

How to port old PGraphicsOpenGL code to Processing 2 alpha - Additive Blending

[9 Replies]
- 26-Oct-2011 02:32 PM
- Forum: Core Library Questions
Hi,

I would like to know how to port this piece of code to the new Processing 2 alpha, it is the basic additive blending trick
1. pgl.beginGL();
2. gl.glDisable(GL.GL_DEPTH_TEST);
3. gl.glEnable(GL.GL_BLEND);
4. gl.glBlendFunc(GL.GL_SRC_ALPHA, GL.GL_ONE);
5. pgl.endGL();
For some reason this is not taking any effect on my sketch everything looks sharp pixelated and no blending, any ideas?

Getting extra vertices when building a GLModel mesh

[4 Replies]
- 09-Jul-2011 02:23 AM
- Forum: Contributed Library Questions
There is a library to create 2D iso contour meshes http://www.thecloudlab.org/processing/library.html I took the IsoContour class and modified to draw the mesh using GLModel so I can render with a higher resolution grid, I got it all working but I get some extra vertices always on the right side

The extra vertices dont appear randomly, they stay there after the originals were draw in that location, and them they dissapear when the mesh grows, is like residual vertices, not sure is hard to explain, but note that If I draw the mesh using begin/endShape works fine no residual vertices at all.

Here is the relevant code

In the setup:
1. // Setup fluid mesh
2. final int NUM_VERTICES = 20000;
3. fluid = new GLModel( this, NUM_VERTICES, GLGraphics.TRIANGLES , GLModel.STREAM );
4. fluid.initColors();
5. fluid.beginUpdateColors();
6. for (int i = 0; i < NUM_VERTICES; i++) fluid.updateColor(i, 50, 170, 190, 255);
7. fluid.endUpdateColors();
In the draw:
1. // Update fluid vertices
2. fluid.beginUpdateVertices();
3. for ( int i = 0; i < iso.numVertices; i++) {
4. PVector pos = (PVector)iso.vertexPositions.get(i);
5. fluid.updateVertex( i, pos.x, pos.y, 0 );
6. }
7. fluid.endUpdateVertices();
In side a push/pop matrix block this:
1. if ( isDrawingGLModel ) {
2. GLGraphics renderer = (GLGraphics)g;
3. renderer.beginGL();
4. //renderer.model( fluid );
5. fluid.render( 0, iso.numVertices );
6. renderer.endGL();
7. }
8. else {
9. stroke( 50, 170, 190 );
10. beginShape( TRIANGLES );
11. for ( int i = 0; i < iso.numVertices; i++) {
12. PVector pos = (PVector)iso.vertexPositions.get(i);
13. vertex( pos.x, pos.y );
14. }
15. endShape();
16. }
Thanks

How to remove duplicate vertices for GLModel rendering? Hash Tables? Welding?

[2 Replies]
- 23-Jun-2011 06:16 AM
- Forum: Contributed Library Questions
I have an always changing 2D mesh that needs to be clear and recalculated on every frame, so far I got that bit working fine, but at the moment there are lots of duplicate vertices, so if I need to pump up the number of vertices the framerate obviously drops. To make this work more efficiently I need to get rid off the duplicate vertices some how, no idea how to do that …

I google around and found this post, http://www.devmaster.net/forums/showthread.php?t=8066 were they mention hash tables, so I wonder if any of you has implement this data structure in P5 or Java, or event better can GLGraphics or GLModel clean duplicate vertices some how?

Any help will be much appreciated!

- rS

Building from SVN on Mac

[5 Replies]
- 12-Jun-2011 01:41 AM
- Forum: Library and Tool Development
I download the svn trunk fine but I cant run the make.sh becauce that file doesnt exist in the macosx folder, all I get there is template.app and template.dmg.gz, any idea what I need to do from there?

Thanks

- rS

Javascript mode?

[8 Replies]
- 11-Jun-2011 09:08 AM
- Forum: General Discussion
I just download the latest version 1.5.1 and I cant find the Javascript Mode mention in this articel http://wiki.processing.org/w/JavaScript

What is the status of this feature in the PDE?

Thanks

- rS

How to calculate screen to world coordinates?

[2 Replies]
- 17-May-2011 06:52 AM
- Forum: Programming Questions
Let say I am using either PEasyCam or Proscene cameras, how can I calculate the 3D world coordinate when I click the screen?

Any help will be much appreciated

- rS

How to use the Toxiclibs Voronoi class?

[19 Replies]
- 02-Apr-2011 03:18 AM
- Forum: Contributed Library Questions
Hi, does anyone have a simple sketch using the voronoi class from toxi.geom.mesh2d?

I would like to play with it but I have no idea how to start

Thanks

- rS

GLGraphics + Toxiclibs Volumeutils

[11 Replies]
- 28-Mar-2011 02:48 AM
- Forum: Contributed Library Questions
Hi,

Has anyone have any experience on drawing a TriangleMesh from Volumeutils using the GLGprahics GLModel class? I am interested in doing some 3D printing stuff so I wonder if I can gain a bit of performance by mixing this 2 libs

Any info on the subject will be much appreciated!

- rS

Kinect Heightmap

[0 Replies]
- 26-Mar-2011 03:12 PM
- Forum: Share your Work
Not sure if the title suit the project but I couldn't think of anything else at the time

Project and source code available here https://github.com/nardove/p5KinectHeightmap

Cheers

- rS

Can toxi Spline2D be use for more than Vector positions?

[2 Replies]
- 23-Mar-2011 09:54 AM
- Forum: Contributed Library Questions
Hi,

I have been looking for ways to use the spline methods for more than just vector position calculations, for example I wonder if is possible to use the Spline2D class to calculate a color gradient, or an easing speed ratio?

Does this makes sense or this is an overkill?

Cheers

- rS

How to draw a continuous line from a set of consecutive points?

[16 Replies]
- 21-Mar-2011 05:17 AM
- Forum: Contributed Library Questions
Hi,

I have a grid of points[m x n] and need to draw a series of horizontal lines, but all I get is a dash line pattern,

I am using the GLGraphics library, here is a code snippet
2. points = new GLModel(this, totalPoints, LINES, GLModel.DYNAMIC);
3. points.initColors();
5. points.beginUpdateVertices();
6. // for (int i = 0; i < totalPoints; i++) points.updateVertex( i, pointsPos[i].x, pointsPos[i].y, pointsPos[i].z );
7. for (int i = 0; i < GRID_ROWS; i++) {
8. for (int j = 0; j < GRID_COLUMS; j++) {
9. int n = i + j * GRID_ROWS;
10. System.out.println("n(" + n + "): " + n % 2);
11. points.updateVertex(n, pointsPos[n].x, pointsPos[n].y, pointsPos[n].z);
12. }
13. }
14. points.endUpdateVertices();
I try to use LINE_STRIP or LINE_LOOP but these constants are not valid parameters to the GLModel constructor, and I have no idea how to set this up.

Any help will be much appreciated

- rS

How to avoid PEasyCam rotations when using controlP5 sliders?

[1 Reply]
- 20-Mar-2011 04:33 AM
- Forum: Contributed Library Questions
I have a 3D scene and a few sliders to change a set of parameters, the problem is that every time I click and drag a slider the camera rotates the scene, so I wonder if is possible to avoid the default peasycam arcball functionality while I and using the sliders?

Cheers

- rS

Is it possible to sharp controlP5 fonts in P3D mode?

[1 Reply]
- 20-Mar-2011 02:41 AM
- Forum: Contributed Library Questions
I have a sketch using P3D mode, and the controlP5 fonts looks very blurry and unreadable, if I switch to OPENGL they render fine but the sketch drops the frame rate quite a lot

Cheers

- rS

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