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Update slider value

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- 24-May-2013 02:32 AM
- Forum: Contributed Library Questions
Hi,

Im trying to add a slider to change the number of fish (Slider called nFish and int nFish).

I think i might have done something wrong and something is not being drawn?

From JavaScript i know event listeners but what to do in Processing?
2. /* OpenProcessing Tweak of *@*http://www.openprocessing.org/sketch/40632*@* */
3. /* !do not delete the line above, required for linking your tweak if you re-upload */
4. // code by Claus Rytter Bruun de Neergaard, March 2011
5. // (use of PVector learned from Daniel Shiffman tutorial)
6. // Kinect Tracker by Daniel Shiffman
8. import controlP5.*;
9. import org.openkinect.*;
10. import org.openkinect.processing.*;
12. // GLOBAL VARIABLES ///////////////////////////////
14. KinectTracker tracker; // kinect tracker
15. ControlP5 cp5; // control library
16. Kinect kinect; // kinect
17. int nFish = 4000; // number of agents/fish
18. float s = 7.0; // maximum agent velocity
19. int count = 0;
20. float deg = 15; // start at 15 degrees
21. int bgCol = 0; // background color for canvas for slider
22. int fishCol = 255; // fish color for slider
24. Agent[] agents = new Agent[nFish];
26. // SETUP //////////////////////////////////////////
28. void setup() {
29. size(640,520);
30. smooth();
31. kinect = new Kinect(this);
32. tracker = new KinectTracker();
33. kinect.tilt(deg);
34. noFill();
35. stroke(fishCol);
37. for (int i = 0; i < agents.length; i++) {
38. agents[i] = new Agent();
39. }
41. // SLIDER FISH
42. cp5 = new ControlP5(this);
43. cp5.addSlider("nFish")
44. .setPosition(20,10)
45. .setRange(0,5000)
46. ;
48. // SLIDER BG COLOR
49. cp5 = new ControlP5(this);
50. cp5.addSlider("bgCol")
51. .setPosition(20,20)
52. .setRange(0,255)
53. ;
55. // SLIDER FISH COLOR
56. cp5 = new ControlP5(this);
57. cp5.addSlider("fishCol")
58. .setPosition(20,30)
59. .setRange(255,0)
60. ;
61. }
63. // DRAW ///////////////////////////////////////////
65. void draw() {
67. // SLIDER DRAW! IMPORTANT!
68. background(bgCol);
69. stroke(fishCol);
71. // Run the tracking analysis
72. tracker.track();
73. // Show image
74. // tracker.display();
76. // Avr track position
77. PVector v2 = tracker.getLerpedPos(); // Get position
78. fill(100,250,50,200); // Fill ellipse
79. ellipse(v2.x,v2.y,30,30); // Get ellipse
81. // calling functions of all of the objects in the array
82. for (int i = 0; i < agents.length; i++) {
83. agents[i].update();
84. agents[i].edges();
85. agents[i].display();
86. }
87. }
89. // Kinect up and down. Arrow control.
90. void keyPressed() {
91. if (key == CODED) {
92. if (keyCode == UP) {
93. deg++;
94. }
95. else if (keyCode == DOWN) {
96. deg--;
97. }
98. deg = constrain(deg,0,30);
99. kinect.tilt(deg);
100. }
101. }
103. // CLASS //////////////////////////////////////////
105. class Agent {
106. PVector loc;
107. PVector vel;
108. PVector acc;
109. float speed;
111. Agent() {
112. loc = new PVector(random(0, width), random(0, height));
113. vel = new PVector(0, 0);
114. speed = s;
115. }
117. void update() {
118. PVector v2 = tracker.getLerpedPos();
119. PVector track = new PVector(v2.x, v2.y);
120. PVector dir = PVector.sub(track, loc);
121. dir.normalize();
122. dir.mult(0.15);
123. acc = dir;
125. vel.add(acc);
126. vel.limit(speed);
127. loc.add(vel);
128. }
132. void edges() {
134. if (loc.x > width) {
135. loc.x = 0;
136. } else if (loc.x < 0) {
137. loc.x = width;
138. }
140. if (loc.y > height) {
141. loc.y = 0;
142. } else if (loc.y < 0) {
143. loc.y = height;
144. }
146. }
148. void display() {
149. point(loc.x, loc.y);
150. }
152. }
154. void stop() {
155. tracker.quit();
156. super.stop();
157. }

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