SimpleParticleSim/ParticleSim.html at main · edwin-retana/SimpleParticleSim · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
<!DOCTYPE html>
<html>
<head>
  <title>Particle Simulator Extension</title>
</head>
<body>

<div>
  <button id="button-start" type="button">Start</button>
  <button id="button-stop" type="button">Stop</button>
  <button id="button-new-particle" type="button">New Particle</button>
  <button id="button-restart" type="button">Return Particles</button>
</div>

<div>
  <button id="button-random-velocity" type="button">Randomly Increase Velocity</button>
  <button id="button-random-slowdown" type="button">Randomly Decrease Velocity</button>
  <button id="button-delete-particles" type="button">Delete All Extra Particles</button>
</div>

<div>
  <label for="ID_WIND_FORCE_X">Wind Force X</label>
  <input id="ID_WIND_FORCE_X" type="range" min="-10" max="10" value="0">
</div>


<div>
  <label for="ID_WIND_FORCE_Y">Wind Force Y</label>
  <input id="ID_WIND_FORCE_Y" type="range" min="-10" max="10" value="0">
</div>

<canvas id="myCanvas" width="600" height="600" style="border:2px solid #d3d3d3;">
Your browser does not support the HTML5 canvas tag.</canvas>

<script src="Particle.js"></script>

<script>

var count = 1;
var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");

var inMotion = false;
var returning = false;

let particle = new Particle(canvas.width/2, 0,Math.random()*5+0.1, count);

var particles = [particle];

var gravity = {
  accX: 0.0, accY: 9.8 };

var wind = {
	forceX: 2.0, forceY: 0.0
};


var timePrevious = Date.now();
var elapsedTimeSeconds = 0;

document.getElementById("ID_WIND_FORCE_X").addEventListener("change", onChangeWindX);
document.getElementById("ID_WIND_FORCE_Y").addEventListener("change", onChangeWindY);
document.getElementById("button-new-particle").addEventListener("click", onAddParticle);
document.getElementById("button-restart").addEventListener("click", onReturnParticles);
document.getElementById("button-start").addEventListener("click", onStart);
document.getElementById("button-stop").addEventListener("click", onStop);
document.getElementById("button-random-velocity").addEventListener("click", onRandomVelocity);
document.getElementById("button-delete-particles").addEventListener("click", onDeleteParticles);
document.getElementById("button-random-slowdown").addEventListener("click", onSlowdownVelocity);

repaintParticles();
repaint();

function repaint() {
  let timeNow = Date.now();
  elapsedTimeSeconds = (timeNow - timePrevious)/1000.0;
  timePrevious = timeNow;
  if (inMotion) {
    repaintParticles();
  } else if (returning) {
    returnParticles();
  }
  window.requestAnimationFrame(repaint);
}

function repaintParticles() {
  ctx.clearRect(0,0, canvas.width, canvas.height);
  for (i = 0; i < particles.length; i++) {
    particles[i].paint(ctx);
  }

  for (i = 0; i < particles.length; i++) {
    let p = particles[i];
    p.update(elapsedTimeSeconds);
  	let windAccX = forceToAccel(wind.forceX, p.mass);
  	let windAccY = forceToAccel(wind.forceY, p.mass);
    let addedForce = forceToAccel();
    p.setAcceleration(gravity.accX + windAccX, gravity.accY + windAccY);

    if (p.posX < 0) {
      p.posX = 1;
      p.flipSpeedX();
    }
    if (p.posX > canvas.width) {
      p.posX = canvas.width - 1;
      p.flipSpeedX();
    }
    if (p.posY < 0) {
      p.posY = 1;
      p.flipSpeedY();
    }
    if (p.posY > canvas.height) {
      p.posY = canvas.height - 1;
      p.flipSpeedY();
    }
  }
}

function onChangeWindX(evt) {
  wind.forceX = evt.target.value;
}

function onChangeWindY(evt) {
  wind.forceY = evt.target.value;
}

function onAddParticle() {
  if (returning) {
    return;
  }
  count++;
  let newParticle = new Particle(canvas.width/2, 0,Math.random()*5+0.1,count);
  newParticle.paint(ctx);
  particles.push(newParticle);
}

function onReturnParticles() {
  inMotion = false;
  returning = true;
  for (i = 0; i < particles.length; i++) {
    particles[i].posX = Math.floor(particles[i].posX)*1.0;
    particles[i].posY = Math.floor(particles[i].posY)*1.0;
    particles[i].posX -= particles[i].posX % 10;
    particles[i].posY -= particles[i].posY % 10;
  }
}

function returnParticles() {
  if (!particlesReturned()) {
    ctx.clearRect(0,0, canvas.width, canvas.height);
    for (i = 0; i < particles.length; i++) {
      let p = particles[i];
      if (p.posX > canvas.width/2) {
        p.posX = p.posX - 10;
      } else if (p.posX < canvas.width/2) {
        p.posX = p.posX + 10;
      }
      if (p.posY > 0) {
        p.posY = p.posY - 10;
      } else if (p.posY < 0) {
        p.posY = p.posY + 10;
      }
      p.paint(ctx);
    }
  } else {
    for (i = 0; i < particles.length; i++) {
      particles[i].restartSpeed();
    }
    repaintParticles();
    returning = false;
  }
}


function particlesReturned() {
  for (i = 0; i < particles.length; i++) {
    if (particles[i].posX != canvas.width/2 || particles[i].posY != 0) {
      return false;
    }
  }
  return true;
}

function onStart() {
  if (returning) {
    return;
  }
  inMotion = true;
}

function onStop() {
  if (returning) {
    return;
  }
  inMotion = false;
}

function onDeleteParticles() {
  if (count == 1 || returning) {
    return;
  }
  count = 1;
  particles = [particles[0]];
  onReturnParticles();
}

function onRandomVelocity() {
  if (returning) {
    return;
  }
  for (i = 0; i < particles.length; i++) {
    particles[i].velX = particles[i].velX * (Math.random()*1.9 + 1.1);
    particles[i].velY = particles[i].velY * (Math.random()*1.9 + 1.1);
  }
}

function onSlowdownVelocity() {
  if (returning) {
    return;
  }
  for (i = 0; i < particles.length; i++) {
    particles[i].velX = particles[i].velX * (Math.random()*0.89 + 0.1);
    particles[i].velY = particles[i].velY * (Math.random()*0.89 + 0.1);
  }
}

function forceToAccel(force, mass) {
  // force = mass x acceleration
  return force / mass;
}

</script>

</body>
</html>