Участник:StarfloFr

Код программы

Код программы на языке JavaScript:

  1 	class Ball {
  2 		constructor(x, y, r, vx, vy,color){
  3 		    this.x = x;
  4 			this.y = y;
  5 			this.r = r;
  6 			this.vx = vy;
  7 			this.vy = vx;
  8 
  9 			this.calculateMass();
 10 
 11 			this.color = color;
 12 		}
 13 
 14 		calculateMass() {
 15 			this.m = (this.r * this.r * this.r)/50 ;
 16 		}
 17 
 18 		getVx() {
 19 			return this.vx * Math.pow(2, timeSpeed);
 20 		}
 21 
 22 		getVy() {
 23 			return this.vy * Math.pow(2, timeSpeed);
 24 		}
 25 
 26 		move() {
 27 			this.x += this.getVx();
 28 			this.y += this.getVy();
 29 		}
 30 		
 31 	}
 32 
 33 	var count = 50;
 34 
 35 	var MAX_SPEED = 20;
 36 	var MIN_RADIUS = 100;
 37 	var MAX_RADIUS = 100;
 38 	var WIDTH = 10000;
 39 
 40 	var timeSpeed = 0;
 41 
 42 	var balls = [];
 43 
 44 	var canvas;
 45 	var ctx;
 46 	var T = 300;
 47 	var pathx = [];
 48 	var pathy = [];
 49 		
 50 	function random(min, max) {
 51 		return Math.random() * (max - min) + min;	
 52 	}
 53 
 54 	function move() {
 55 
 56 		for (var i = 0; i < count; i++) {
 57 			var ball = balls[i];
 58 
 59 			if (ball.x < ball.r && ball.vx < 0)
 60 				ball.vx *=-1;
 61 			if (ball.x > WIDTH-ball.r && ball.vx > 0)
 62 				ball.vx *=-1;
 63 			if (ball.y < ball.r && ball.vy < 0)
 64 				ball.vy *=-1;
 65 			if (ball.y > WIDTH-ball.r && ball.vy > 0)
 66 				ball.vy *=-1;
 67 			
 68 			for (var j = i + 1; j < count; j++) {
 69 				var ball2= balls[j];
 70 				var z = (ball.x - ball2.x) * (ball.getVx() - ball2.getVx()) + (ball.y - ball2.y) * (ball.getVy() - ball2.getVy());
 71 				var l = Math.pow(ball.getVx() - ball2.getVx(), 2) + Math.pow(ball.getVy() - ball2.getVy(), 2);
 72 				var m = Math.pow(ball.x - ball2.x, 2) + Math.pow(ball.y - ball2.y, 2) - Math.pow(ball.r + ball2.r, 2);
 73 				
 74 				var d = z*z - l*m;
 75 				
 76 				var t0 = -(z + Math.sqrt(d)) / l;
 77 
 78 				var p = Math.pow(ball.x - ball2.x, 2) + Math.pow(ball.y - ball2.y, 2);
 79 
 80 				if (t0 >= 0 && t0 <= 1 || p < Math.pow(ball.r + ball2.r, 2)) {
 81 					ball.x += t0 * ball.getVx();
 82 					ball.y += t0 * ball.getVy();	
 83 					ball2.x += t0 * ball2.getVx();	
 84 					ball2.y += t0 * ball2.getVy();	
 85 					
 86 					var px = ball.x - ball2.x;
 87 					var py = ball.y - ball2.y;
 88 
 89 					var q = 2 * (px * (ball2.vx - ball.vx) + py * (ball2.vy - ball.vy))
 90 					
 91 					var dvx = q * px / (Math.pow(px, 2) + Math.pow(py,2)) * ball.m * ball2.m / (ball.m + ball2.m);
 92 					var dvy = q * py / (Math.pow(px, 2) + Math.pow(py,2)) * ball.m * ball2.m / (ball.m + ball2.m);
 93 					var k = 1.38 * Math.pow(10,-23);
 94 
 95 					ball.vx += dvx / ball.m;
 96 					ball.vy += dvy / ball.m;
 97 					ball2.vx -= dvx / ball2.m;
 98 					ball2.vy -= dvy / ball2.m;
 99 										
100 				}
101 				
102 			}
103 			
104 			ball.move();
105 		}
106 
107 
108 		draw();	
109 	}
110 
111 		
112 	
113 	function draw() {
114 		ctx.clearRect(0, 0, canvas.width, canvas.height);
115 
116 		var c = canvas.width / WIDTH;
117 
118 		for (var i = 0; i < count; i++) {
119 			var ball= balls[i];
120 			ctx.beginPath();
121 			ctx.arc(ball.x * c, ball.y * c, ball.r * c, 0, 2 * Math.PI, false);
122 			
123 			if (document.getElementById('color').checked)
124 				ctx.fillStyle = ball.color;
125 			else
126 				ctx.fillStyle = 'blue';
127 
128 			ctx.fill();
129 			
130 			
131 		
132 		}
133 		drawPath();
134 	}
135 			
136 	function start() {
137 		balls[0]= new Ball( WIDTH/2  , WIDTH/2, 500, 0, 0,'red');
138 		for (var i = 1; i < count; i++) {
139 			var r = random(MIN_RADIUS, MAX_RADIUS);
140 			balls[i] = new Ball(random(r, WIDTH - r), random(r, WIDTH - r), r, random(-MAX_SPEED, MAX_SPEED), random(-MAX_SPEED, MAX_SPEED),'blue');
141 			
142 		}
143 		
144 		canvas = document.getElementById('GG');
145 		ctx = canvas.getContext('2d');
146 		
147 		setInterval(move, 1);
148 	}
149 
150 	function weight() {
151 		
152 		var r = parseInt(document.getElementById('weight').value);
153 		if (r > WIDTH / 2 || r < 50) 
154 			return;
155 
156 		var oldMass = balls[0].m;
157 		balls[0].r = r;
158 		balls[0].calculateMass();
159 
160 		balls[0].vx *= Math.sqrt(oldMass / balls[0].m);
161 		balls[0].vy *= Math.sqrt(oldMass / balls[0].m);
162 
163 		if (balls[0].x > WIDTH - r)
164 			balls[0].x = WIDTH - r;
165 		if (balls[0].x < r)
166 			balls[0].x = r;
167 		if (balls[0].y > WIDTH - r)
168 			balls[0].y = WIDTH - r;
169 		if (balls[0].y < r)
170 			balls[0].y = r;
171 		
172 	}
173 
174 	function changeSize() {
175 		canvas.width = document.getElementById('size').value;
176 		canvas.height = document.getElementById('size').value;
177 	}
178 
179 	var tander = 0;
180 		
181 	function drawPath() {
182 		tander++;
183 		if (tander === 5) {
184 			tander = 0;
185 			if (pathx.length>=1000) {
186 				pathx.shift();
187 				pathy.shift();
188 			}
189 			 
190 			var c = canvas.width / WIDTH;
191 			pathx.push( balls[0].x*c);
192 			pathy.push( balls[0].y*c);
193 		}
194 		ctx.beginPath();
195 		ctx.lineWidth = 2;
196 	        ctx.strokeStyle = 'Black';
197 		ctx.moveTo(pathx[0], pathy[0]);
198 
199 		for (i=1;i<pathx.length; i++) {
200 	        	ctx.lineTo(pathx[i], pathy[i]);
201 		}
202 			 
203 		ctx.stroke();
204 	}
205 		
206 		
207 		
208 	function add() {
209 		var k = parseInt(document.getElementById('addCount').value);
210 		k = Math.min(k , 250 - balls.length);
211 		for (var i = 0; i < k; i++) {
212 			var r = random(MIN_RADIUS, MAX_RADIUS);
213 			balls[count + i] = new Ball(random(r, WIDTH - r), random(r, WIDTH - r), r, random(-MAX_SPEED, MAX_SPEED), random(-MAX_SPEED, MAX_SPEED));
214 		
215 		}
216 		count += k;
217 	}
218 		
219 	function del() {
220 		var k = Math.min(count - 1, parseInt(document.getElementById('addCount').value));
221 		balls = balls.slice(0, count - k);
222 		count -= k;
223 	}
224 
225 	function slowly() {
226 		if (timeSpeed > -3)
227 			timeSpeed--;
228 	}
229 
230 	function faster() {
231 		if (timeSpeed < 3)
232 			timeSpeed++;
233 	}