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Multiple Particle System by Shiffman : Change particle color

[2 Replies]
- 08-Mar-2012 08:07 AM
- Forum: Programming Questions
Hello,

I've been playing with Daniel Shiffman Multiple Particle System,

trying to build with Processing a mockup animation I did in After effect.

Firstly, I can't figure out how to give a color to one particle at birth

and make it fade to another. (e.g. A triangle shape that starts red and finish yellow).

RIght now what I try keeps changing the colors at each frame..

Secondly, I don't know how to make them scale down before "dying". I've look on the

scale() methods, without success.

Any idea will be much appreciated :)
2. ArrayList psystems;
4. void setup() {
5. size(800, 600);
6. colorMode(RGB, 255, 255, 255, 100);
7. psystems = new ArrayList();
8. smooth();
9. }
11. void draw() {
12. background(0);
13. for (int i = psystems.size()-1; i >= 0; i--) {
14. ParticleSystem psys = (ParticleSystem) psystems.get(i);
15. psys.run();
16. if (psys.dead()) {
17. psystems.remove(i);
18. }
19. }
20. psystems.add(new ParticleSystem(int(random(1,3)), 0.1, new PVector(random(350,450),700)));
22. }
27. color[] colors = {
28. color(0xC94053, 255), color(0x993559, 255), color(0x6B274E, 255), color(0x421F3E, 255), color(0xFFAA68, 255)
29. };
31. // A simple Particle class
32. class Particle {
33. PVector loc;
34. PVector vel;
35. PVector acc;
36. float r;
37. float timer;
39. // Particle Constructor
40. Particle(PVector l) {
41. acc = new PVector(0,0,0);
42. vel = new PVector(random(-0.05,0.05),random(-3,0),0);
43. loc = l.get();
44. r = 10.0;
45. //durée de vie
46. timer = 150.0;
47. }
49. void run() {
50. update();
51. render();
52. }
54. // Method to update location
55. void update() {
56. vel.add(acc);
57. loc.add(vel);
58. timer -= 1.0;
59. // println(timer);
60. }
63. // Method to display
64. void render() {
65. noStroke();
67. fill(colors[(int)random(colors.length)],timer);
68. triangle(loc.x, loc.y, loc.x+40, loc.y-90, loc.x+80, loc.y);
70. }
72. // Is the particle still useful?
73. boolean dead() {
74. if (timer <= 0.0) {
75. return true;
76. } else {
77. return false;
78. }
79. }
80. }
86. // An ArrayList is used to manage the list of Particles
88. class ParticleSystem {
90. ArrayList particles; // An arraylist for all the particles
91. PVector origin; // An origin point for where particles are birthed
93. ParticleSystem(int pNum,float pChance, PVector v) {
94. particles = new ArrayList(); // Initialize the arraylist
95. origin = v.get(); // Store the origin point
98. for (int i = 0; i < pNum; i++) {
99. if (random(1) < pChance) {
100. particles.add(new Particle(origin));
101. }
102. }
103. }
105. void run() {
106. // Cycle through the ArrayList backwards b/c we are deleting
107. for (int i = particles.size()-1; i >= 0; i--) {
108. Particle p = (Particle) particles.get(i);
109. p.run();
111. if (p.dead()) {
112. particles.remove(i);
113. }
114. }
115. }
117. // A method to test if the particle system still has particles
118. boolean dead() {
119. if (particles.isEmpty()) {
120. return true;
121. }
122. else {
123. return false;
124. }
125. }
127. }

Twitter4j documentation for processing ?

[5 Replies]
- 24-Feb-2012 11:07 AM
- Forum: Contributed Library Questions
Hello,

I've been playing around with the twitter4j library and it works very well !

I'm just looking (hard) to find all the possible properties and method for

use with processing with that Library (and their signification)

For example, what is "setRpp",

or what are the different method of Query.

And there is "getText", "getCreatedAt", "getFromUser", etc... what else ?

I found this :

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

but i don't seem to find everything and I don't understand it all...

Thanks !

Methodology for loading data(text) from the web.

[4 Replies]
- 18-Feb-2012 02:16 PM
- Forum: General Discussion
Hello Processors,

I've been looking around the forum, but I'm a bit lost since I don't know exactly what I need to do what I want...

I'm doing an interactive installation where animated graphic from Processing will be projected on a big pyramid (using madmapper).

So what I want to do :
1. People will go to a website from their phone
2. They will be able to enter a word
3. They will "send" that word somewhere (probably a server but I don't know how it work)
4. When the word is sent, it will appear on my pyramid (so Processing needs to be able to get that word somewhere in realtime)
I suppose the website part will be done in PHP, but I'm wondering how to do the step 4 above, especially in realtime, so that each time a new word is 'sent' (or written on a file), my installation updates itself and display this new word..
I don't ask for the code, but rather the best way to do this...

Any idea is welcome !

Thanks

utopiko

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