X = undefined; class Particle{ /* -5 absounce -4 abserk -3 abseleration -2 absity -1 absement (absition) 0 position (displacement) 1 velocity 2 acceleration 3 jerk 4 jounce (snap) 5 crackle 6 pop 7 lock 8 drop */ constructor(p, r, c, m, v, a, j){ this.reset(); if(p!==X) this.pos.set(p); if(r!==X) this.rad.set(r); if(c!==X) this.color.set(c); if(m!==X) this.mass.set(m); if(v!==X) this.vel.set(v); if(a!==X) this.acc.set(a); if(j!==X) this.jrk.set(j); } reset(){ var init = {pos: {x:1440, y:1440}, rad: 10, color: "red", mass: X}; this.pos = function(){ return init.pos; }; this.pos.set = function(pos){ if(typeof pos==="function") pos = pos(); if(typeof pos.x === "number" && typeof pos.y === "number"){ checkInf(pos.x) && checkInf(pos.y) && (init.pos.x = pos.x, init.pos.y = pos.y); } }; this.pos.setx = function(posx){ if(typeof posx==="function") posx = posx(); if(typeof posx === "number") checkInf(posx) && (init.pos.x = posx); }; this.pos.sety = function(posy){ if(typeof posy==="function") posy = posy(); if(typeof posy === "number") checkInf(posy) && (init.pos.y = posy); }; this.pos.toString = function(){ return "("+init.pos.x+", "+init.pos.y+")"; }; this.rad = function(){ return init.rad; }; this.rad.set = function(rad){ if(typeof rad==="function") rad = rad(); if(typeof rad === "number") init.rad = rad; }; this.rad.toString = function(){ return init.rad.toString(); }; this.mass = function(){ if(init.mass===X) init.mass=init.rad*init.rad/100; return init.mass; }; this.mass.set = function(mass){ if(typeof mass==="function") mass = mass(); if(typeof mass === "number") init.mass = mass; }; this.mass.toString = function(){ return init.mass.toString(); }; this.color = function(){ return init.color; }; this.color.set = function(color){ if(typeof color==="function") color = color(); init.color = color; }; this.color.toString = function(){ return init.color.toString(); }; for(var dyn of ["vel", "acc", "jrk"]){ setdyn(this, init, dyn); } function setdyn(p, init, dyn){ init[dyn] = {x:0, y:0}; p[dyn] = function(){ return init[dyn]; }; p[dyn].set = function(dync){ if(typeof dync==="function") dync = dync(); if(typeof dync.x === "number" && typeof dync.y === "number"){ checkInf(dync.x) && checkInf(dync.y) && (init[dyn].x = dync.x, init[dyn].y = dync.y); } }; p[dyn].setx = function(dynx){ if(typeof dynx==="function") dynx = dynx(); if(typeof dynx === "number") checkInf(dynx) && (init[dyn].x = dynx); }; p[dyn].sety = function(dyny){ if(typeof dyny==="function") dyny = dyny(); if(typeof dyny === "number") checkInf(dyny) && (init[dyn].y = dyny); }; p[dyn].toString = function(){ return "("+init[dyn].x+", "+init[dyn].y+")"; }; } } get x(){return this.pos().x}; get y(){return this.pos().y}; get r(){return this.rad()}; get m(){return this.mass()}; get v(){return this.vel()}; get a(){return this.acc()}; get j(){return this.jrk()}; get KE(){ return 0.5*this.m* Math.pow(Vector2D.len(this.v),2); } UE(canvas, g){ return this.m*g.y*(canvas.height-this.y); } putOn(canvas){ var p=this; if(p.x<-p.r || p.x>canvas.width+p.r || p.y<-p.r || p.y>canvas.height+p.r) return; var ctx = canvas.getContext("2d"); ctx.fillStyle = p.color(); ctx.beginPath(); ctx.arc(p.x, p.y, p.r, 0, Math.PI*2); if(p.x+p.r>canvas.width && canvas.borderRight==="loop"){ ctx.arc(p.x-canvas.width, p.y, p.r, 0, Math.PI*2); } else if(p.x=333){ lastfps = fps.count*3; fps.innerText = fps.count*3; fps.count=0; time = Date.now(); } canvas.getContext("2d").clearRect(0,0, canvas.width, canvas.height); for(var p of particles){ p.acc.set({x:p.a.x+p.j.x/frq, y:p.a.y+p.j.y/frq}); p.vel.set({x:p.v.x+p.a.x/frq, y:p.v.y+p.a.y/frq}); p.pos.set({x:p.x+p.v.x/frq, y:p.y+p.v.y/frq}); restrict(canvas, p); p.putOn(canvas); } for(var i=0; i=canvas.width && canvas.borderRight!=="infinite"){ switch(canvas.borderRight){ case "block": //need modify p.vel.setx(-Math.abs(p.v.x)) & p.pos.setx(p.x+p.v.x/frq); break; case "loop": if(p.x>canvas.width) p.pos.setx(p.x%canvas.width-canvas.width); } }else if(p.x<=p.r && canvas.borderLeft!=="infinite"){ switch(canvas.borderLeft){ case "block": // need modify p.vel.setx(Math.abs(p.v.x)) & p.pos.setx(p.x+p.v.x/frq); break; case "loop": if(p.x<0) p.pos.setx(p.x%canvas.width+canvas.width); } } if(p.y+p.r>=canvas.height && canvas.borderDown!=="infinite"){ switch(canvas.borderDown){ case "block": //need modify p.vel.sety(-Math.abs(p.v.y)) & p.pos.sety(p.y+p.v.y/frq); break; case "loop": if(p.y>canvas.height)p.pos.sety(p.y%canvas.height-canvas.height); } }else if(p.y<=p.r && canvas.borderUp!=="infinite"){ switch(canvas.borderUp){ case "block": // need modify p.vel.sety(Math.abs(p.v.y)) & p.pos.sety(p.y+p.v.y/frq); break; case "loop": if(p.y<0) p.pos.sety(p.y%canvas.height+canvas.height); } } } class Vector2D{ static add(a,b){ return {x:a.x+b.x, y:a.y+b.y}; } static sub(a,b){ return {x:a.x-b.x, y:a.y-b.y}; } static mul(a,n){ return {x:a.x*n, y:a.y*n}; } static dot(a,b){ return a.x*b.x + a.y*b.y; } static cross(a,b){ return {x:0, y:0, z:a.x*b.y - a.y*b.x}; } static len(a){ return Math.pow(a.x*a.x+a.y*a.y,.5); } static unit(a){ var l = Vector2D.len(a); return {x:a.x/l, y:a.y/l}; } static proj(a,b){ return Vector2D.mul(Vector2D.unit(b), Vector2D.dot(Vector2D.unit(b), a)); } } class Random{ static random(a,b){ if(a===X) a = 0; if(b===X) b = a+1; return Math.random()*(b-a)+a; } static randint(a,b){ return Math.floor(Math.random()*(b-a)+a); } } function toggleInfo(){ if(getComputedStyle(info). display==="none"){ info.style.display = "block"; } else { info.style.display = "none"; for(var c of info.children) info.removeChild(c); } } function showDetails(list){ for(var i=0; i=1000){ while(Math.abs(num)>=1000){ num /= 1000; i += 1; u = UNIT[i] || "(X)"; } }else if(Math.abs(num)<1){ while(Math.abs(num)<1){ num *= 1000; i += 1; u = unit[i] || ""; } if(u===""){ num = 0; } } if(u==="") l+=1; return str(num, l)+u; } function restart(){ clearInterval(ud); setTimeout(window.onload, itvl*5); } function checkInf(n){ if(n+""==="NaN" || Math.abs(n)>Math.pow(10,24)){ console.log("Value Exceed Uplimit!"+ERRORN++) return false; //restart(); } else return true; }

Collisions and Conservation of Mechanical Energy