1. import traer.physics.*;
2. 
   
3. ParticleSystem physics;
4. Particle[][] particles;
5. int gridSize = 10;
6. 
   
7. //STRENGTH OF HANGING SPRING+GETTING 
8. float SPRING_STRENGTH = 0.05;
9. float SPRING_DAMPING = 0.05;
10. 
    
11. void setup()
12. {
13.   size(400, 400);
14.   smooth();
15.   fill(0);
16.         
17.   //(SETTING GRAVITY AT 0, RIGIDITY)
18.   physics = new ParticleSystem(0, 0.1);
19.   
20.   particles = new Particle[gridSize][gridSize];
21.   
22.   float gridStepX = (float) ((width / 2) / gridSize);
23.   float gridStepY = (float) ((height / 2) / gridSize);
24.   
25.   for (int i = 0; i < gridSize; i++)
26.   {
27.     for (int j = 0; j < gridSize; j++)
28.     {
29.       particles[i][j] = physics.makeParticle(0.2, j * gridStepX + (width / 4), i * gridStepY + 20, 0.0);
30.       if (j > 0)
31.       {
32.         physics.makeSpring(particles[i][j - 1], particles[i][j], SPRING_STRENGTH, SPRING_DAMPING, gridStepX);
33.       }
34.     }
35.   }
36.   
37.   for (int j = 0; j < gridSize; j++)
38.   {
39.     for (int i = 1; i < gridSize; i++)
40.     {
41.       physics.makeSpring(particles[i - 1][j], particles[i][j], SPRING_STRENGTH, SPRING_DAMPING, gridStepY);
42.     }
43.   }
44.   
45.   particles[0][0].makeFixed();
46.   particles[0][gridSize - 1].makeFixed();
47.   
48. }
49. 
    
50. void draw()
51. {
52.   physics.tick();
53.   
54.   if (mousePressed)
55.   {
56.     particles[0][gridSize - 1].position().set(mouseX, mouseY, 0);
57.     particles[0][gridSize - 1].velocity().clear();
58.   }
59.   
60.   noFill();
61.   
62.   background(255);
63.   
64.   for (int i = 0; i < gridSize; i++)
65.   {
66.     beginShape();
67.     curveVertex(particles[i][0].position().x(), particles[i][0].position().y());
68.     for (int j = 0; j < gridSize; j++)
69.     {
70.       curveVertex(particles[i][j].position().x(), particles[i][j].position().y());
71.     }
72.     curveVertex(particles[i][gridSize - 1].position().x(), particles[i][gridSize - 1].position().y());
73.     endShape();
74.   }
75.   for (int j = 0; j < gridSize; j++)
76.   {
77.     beginShape();
78.     curveVertex(particles[0][j].position().x(), particles[0][j].position().y());
79.     for (int i = 0; i < gridSize; i++)
80.     {
81.       curveVertex(particles[i][j].position().x(), particles[i][j].position().y());
82.     }
83.     curveVertex(particles[gridSize - 1][j].position().x(), particles[gridSize - 1][j].position().y());
84.     endShape();
85.   }
86. }
87. 
    
88. void mouseReleased()
89. {
90.   particles[0][gridSize - 1].velocity().set( (mouseX - pmouseX), (mouseY - pmouseY), 0 );
91. }