Pendulum

Developer
Darby Rathbone
Size
3,104 Kb
Views
42,504
  1. Pendulum Previews
  2. Pendulum HTML Codes
  3. Pendulum JS Codes

How do I make an pendulum?

It follows your mouse as if it was a magnet and bounces with close to 0% momentum/energy lost.. What is a pendulum? How do you make a pendulum? This script and codes were developed by Darby Rathbone on 03 October 2022, Monday.

Pendulum Previews
IQ Test

Pendulum - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>pendulum</title>
</head>
<body> <div class="test" > <canvas class="test" id="canvas" style="border:inset" width=300 height=300></canvas></div>
<div class="debug" id='debug'></div> <script src="js/index.js"></script>
</body>
</html>

Pendulum - Script Codes JS Codes

var Vector = (function () { function Vector(x, y) { this.x = x != null ? x : 0; this.y = y != null ? y : 0 } Vector.add = function (v1, v2) { return new Vector(v1.x + v2.x, v1.y + v2.y); }; Vector.sub = function (v1, v2) { return new Vector(v1.x - v2.x, v1.y - v2.y); }; Vector.project = function (v1, v2) { return v1.clone().scale((v1.dot(v2)) / v1.magSq()); }; Vector.prototype.set = function (x, y) { this.x = x; this.y = y; return this; }; Vector.prototype.add = function (v) { this.x += v.x; this.y += v.y; return this; }; Vector.prototype.sub = function (v) { this.x -= v.x; this.y -= v.y; return this; }; Vector.prototype.scale = function (f) { this.x *= f; this.y *= f; return this; }; Vector.prototype.dot = function (v) { return this.x * v.x + this.y * v.y; }; Vector.prototype.cross = function (v) { return (this.x * v.y) - (this.y * v.x); }; Vector.prototype.mag = function () { return Math.sqrt(this.x * this.x + this.y * this.y); }; Vector.prototype.magSq = function () { return this.x * this.x + this.y * this.y; }; Vector.prototype.dist = function (v) { var dx, dy; dx = v.x - this.x; dy = v.y - this.y; return Math.sqrt(dx * dx + dy * dy); }; Vector.prototype.distSq = function (v) { var dx, dy; dx = v.x - this.x; dy = v.y - this.y; return dx * dx + dy * dy; }; Vector.prototype.norm = function () { var m; m = Math.sqrt(this.x * this.x + this.y * this.y); this.x /= m; this.y /= m; return this; }; Vector.prototype.limit = function (l) { var m, mSq; mSq = this.x * this.x + this.y * this.y; if (mSq > l * l) { m = Math.sqrt(mSq); this.x /= m; this.y /= m; this.x *= l; this.y *= l; return this; } }; Vector.prototype.copy = function (v) { this.x = v.x; this.y = v.y; return this; }; Vector.prototype.clone = function () { return new Vector(this.x, this.y); }; Vector.prototype.clear = function () { this.x = 0; this.y = 0; return this; }; Vector.prototype.angle = function () { return Math.atan2(this.y, this.x); }; Vector.prototype.toString = function () { return "[" + this.x + "," + this.y + "]"; }; return Vector;
})();
var Line = (function () { function Line(start, end) { this.start = start.clone(); this.origin = start.clone(); this.end = end.clone(); this.distance = this.start.dist(this.end); this.angle = this.start.clone().sub(this.end).angle(); this.canvas = document.createElement('canvas'); this.canvas.width = this.canvas.height = this.start.x > this.start.y ? this.start.x : this.start.y + this.distance * 2; this.ctx = this.canvas.getContext('2d'); this.context= 0; this.rotation = 0; this.Force = [new Vector(0,0),new Vector(0,0)]; return this; } Line.prototype.addForce = function(f){ this.Force[0].add(f); this.Force[1].add(f); }; Line.prototype.force = function (f) { this.forcepoints = this.points(); this.forcepoints[1].x -= this.forcepoints[0].x + f.x; this.forcepoints[1].y -= this.forcepoints[0].y + f.y; this.rotationchange = Math.sin(this.forcepoints[1].clone().norm().cross(f.clone())); this.rotation += this.rotationchange; this.rotate(this.rotation); return {rotationspeed:this.rotation, rotationspeedchange:this.rotationchange}; }; Line.prototype.draw = function (ctx) { this.context = ctx; this.c = this.ctx; this.c.save(); this.c.translate(this.origin.x, this.origin.y); this.c.rotate(this.angle%(2*Math.PI)); this.c.beginPath(); this.c.moveTo(0, 0); this.c.lineTo(this.distance, 0); this.c.closePath(); this.c.stroke(); this.c.restore(); ctx.drawImage(this.canvas, 0, 0); }; Line.prototype.rotate = function (r) { this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height); this.angle += r; this.angle %= 2*Math.PI ; if (this.angle < 0 ) this.angle+=2*Math.PI; //this.angle ; if (this.context) this.draw(this.context); }; Line.prototype.point = function (x, y, draw) { this.t = new Vector((Math.cos(-this.angle) * (x) - Math.sin(-this.angle) * (y)), (Math.sin(-this.angle) * (x) + Math.cos(-this.angle) * (y))); if (draw === true) { this.ctx.save(); this.ctx.rotate(this.angle); this.ctx.beginPath(); this.ctx.arc(this.t.x, this.t.y, 10, 0, Math.PI * 2, true); this.ctx.closePath(); this.ctx.stroke(); this.ctx.restore(); this.context.drawImage(this.canvas, 0, 0); } return t; }; Line.prototype.points = function () { this.a = []; this.a.push(this.start.clone()); this.a.push(new Vector( this.start.x + Math.cos(this.angle), this.start.y + Math.sin(this.angle))); return this.a; }; return Line;
})();
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
var buffer = document.createElement('canvas');
buffer.width = buffer.height = 500;
var bctx = buffer.getContext('2d');
var lines = new Line(new Vector(150, 150), new Vector(125, 125));
lines.draw(bctx);
var count = 0;
var debug = document.getElementById('debug');
var mousepoint = new Vector(100, 0);
canvas.onmousemove = function (e) { mousepoint = new Vector(e.pageX - canvas.offsetLeft, e.pageY - canvas.offsetTop); var p = lines.point();
};
requestAnimationFrame(function anim() { ctx.clearRect(0, 0, canvas.width, canvas.height); bctx.clearRect(0, 0, buffer.width, buffer.height); ctx.save(); //lines.draw(bctx); var mousetemp = mousepoint.clone().sub(lines.points()[1]).norm(); var forcedata = lines.force((mousetemp).scale(1/(lines.distance*lines.distance))); debug.innerHTML = JSON.stringify(forcedata)+('</br>')+" </br> "+lines.angle+"</br>circumfrence: "+Math.PI*2*lines.distance+"</br>velocity of end:"; var temp = (new Vector(-Math.sin(lines.angle),-Math.cos(lines.angle))).scale(lines.distance*forcedata.rotationspeed); debug.innerHTML+=temp+ " "+temp.mag(); //debug.innerHTML = lines.points(); ctx.drawImage(buffer, 0, 0); ctx.restore(); requestAnimationFrame(anim);
});
Pendulum - Script Codes
Pendulum - Script Codes
Home Page Home
Developer Darby Rathbone
Username blackkbot
Uploaded October 03, 2022
Rating 3
Size 3,104 Kb
Views 42,504
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