<html>
<head>
<script type="text/javascript">
function log(msg)
{
var textArea;
textArea = document.getElementById("logArea");
textArea.value = msg + "\n" + textArea.value;
}
function clearLog()
{
var textArea;
textArea = document.getElementById("logArea");
textArea.value = "";
}
</script>
<script type="text/javascript" src="blobsallad.js">
</script>
<style type="text/css">
canvas { }
</style>
</head>
<body onload="init();clearLog();">
<canvas id="blob" width="600" height="400"></canvas><br>
<a href="javascript:stop()">pause simulation</a>
<a href="javascript:start()">resume simulation</a>
</body> function Vector(x, y)
{
this.x = x;
this.y = y;
this.equal = function(v)
{
return this.x == v.getX() && this.y == v.getY();
}
this.getX = function()
{
return this.x;
}
this.getY = function()
{
return this.y;
}
this.setX = function(x)
{
this.x = x;
}
this.setY = function(y)
{
this.y = y;
}
this.addX = function(x)
{
this.x += x;
}
this.addY = function(y)
{
this.y += y;
}
this.set = function(v)
{
this.x = v.getX();
this.y = v.getY();
}
this.add = function(v)
{
this.x += v.getX();
this.y += v.getY();
}
this.sub = function(v)
{
this.x -= v.getX();
this.y -= v.getY();
}
this.dotProd = function(v)
{
return this.x * v.getX() + this.y * v.getY();
}
this.length = function()
{
return Math.sqrt(this.x * this.x + this.y * this.y);
}
this.scale = function(scaleFactor)
{
this.x *= scaleFactor;
this.y *= scaleFactor;
}
this.toString = function()
{
return " X: " + this.x + " Y: " + this.y;
}
}
function Environment(x, y, w, h)
{
this.left = x;
this.right = x + w;
this.top = y;
this.buttom = y + h;
this.r = new Vector(0.0, 0.0);
this.collision = function(curPos, prevPos)
{
var collide = false;
var i;
if(curPos.getX() < this.left)
{
curPos.setX(this.left);
collide = true;
}
else if(curPos.getX() > this.right)
{
curPos.setX(this.right);
collide = true;
}
if(curPos.getY() < this.top)
{
curPos.setY(this.top);
collide = true;
}
else if(curPos.getY() > this.buttom)
{
curPos.setY(this.buttom);
collide = true;
}
return collide;
}
this.draw = function(ctx, scaleFactor)
{
}
}
function PointMass(cx, cy, mass)
{
this.cur = new Vector(cx, cy);
this.prev = new Vector(cx, cy);
this.mass = mass;
this.force = new Vector(0.0, 0.0);
this.result = new Vector(0.0, 0.0);
this.friction = 0.01;
this.getXPos = function()
{
return this.cur.getX();
}
this.getYPos = function()
{
return this.cur.getY();
}
this.getPos = function()
{
return this.cur;
}
this.getXPrevPos = function()
{
return this.prev.getX();
}
this.getYPrevPos = function()
{
return this.prev.getY();
}
this.getPrevPos = function()
{
return this.prev;
}
this.addXPos = function(dx)
{
this.cur.addX(dx);
}
this.addYPos = function(dy)
{
this.cur.addY(dy);
}
this.setForce = function(force)
{
this.force.set(force);
}
this.addForce = function(force)
{
this.force.add(force);
}
this.getMass = function()
{
return this.mass;
}
this.setMass = function(mass)
{
this.mass = mass;
}
this.move = function(dt)
{
var t, a, c, dtdt;
dtdt = dt * dt;
a = this.force.getX() / this.mass;
c = this.cur.getX();
t = (2.0 - this.friction) * c - (1.0 - this.friction) * this.prev.getX() + a * dtdt;
this.prev.setX(c);
this.cur.setX(t);
a = this.force.getY() / this.mass;
c = this.cur.getY();
t = (2.0 - this.friction) * c - (1.0 - this.friction) * this.prev.getY() + a * dtdt;
this.prev.setY(c);
this.cur.setY(t);
}
this.setFriction = function(friction)
{
this.friction = friction;
}
this.getVelocity = function()
{
var cXpX, cYpY;
cXpX = this.cur.getX() - this.prev.getX();
cYpY = this.cur.getY() - this.prev.getY();
return cXpX * cXpX + cYpY * cYpY;
}
this.draw = function(ctx, scaleFactor)
{
ctx.lineWidth = 2;
ctx.fillStyle = '#000000';
ctx.strokeStyle = '#000000';
ctx.beginPath();
ctx.arc(this.cur.getX() * scaleFactor,
this.cur.getY() * scaleFactor,
4.0, 0.0, Math.PI * 2.0, true);
ctx.fill();
}
}
function ConstraintY(pointMass, y, shortConst, longConst)
{
this.pointMass = pointMass;
this.y = y;
this.delta = new Vector(0.0, 0.0);
this.shortConst = shortConst;
this.longConst = longConst;
this.sc = function()
{
var dist;
dist = Math.abs(this.pointMass.getYPos() - this.y);
this.delta.setY(-dist);
if(this.shortConst != 0.0 && dist < this.shortConst)
{
var scaleFactor;
scaleFactor = this.shortConst / dist;
this.delta.scale(scaleFactor);
pointMass.getPos().sub(this.delta);
}
else if(this.longConst != 0.0 && dist > this.longConst)
{
var scaleFactor;
scaleFactor = this.longConst / dist;
this.delta.scale(scaleFactor);
pointMass.getPos().sub(this.delta);
}
}
}
function Joint(pointMassA, pointMassB, shortConst, longConst)
{
this.pointMassA = pointMassA;
this.pointMassB = pointMassB;
this.delta = new Vector(0.0, 0.0);
this.pointMassAPos = pointMassA.getPos();
this.pointMassBPos = pointMassB.getPos();
this.delta.set(this.pointMassBPos);
this.delta.sub(this.pointMassAPos);
this.shortConst = this.delta.length() * shortConst;
this.longConst = this.delta.length() * longConst;
this.scSquared = this.shortConst * this.shortConst;
this.lcSquared = this.longConst * this.longConst;
this.setDist = function(shortConst, longConst)
{
this.shortConst = shortConst;
this.longConst = longConst;
this.scSquared = this.shortConst * this.shortConst;
this.lcSquared = this.longConst * this.longConst;
}
this.scale = function(scaleFactor)
{
this.shortConst = this.shortConst * scaleFactor;
this.longConst = this.longConst * scaleFactor;
this.scSquared = this.shortConst * this.shortConst;
this.lcSquared = this.longConst * this.longConst;
}
this.sc = function()
{
this.delta.set(this.pointMassBPos);
this.delta.sub(this.pointMassAPos);
var dp = this.delta.dotProd(this.delta);
if(this.shortConst != 0.0 && dp < this.scSquared)
{
var scaleFactor;
scaleFactor = this.scSquared / (dp + this.scSquared) - 0.5;
this.delta.scale(scaleFactor);
this.pointMassAPos.sub(this.delta);
this.pointMassBPos.add(this.delta);
}
else if(this.longConst != 0.0 && dp > this.lcSquared)
{
var scaleFactor;
scaleFactor = this.lcSquared / (dp + this.lcSquared) - 0.5;
this.delta.scale(scaleFactor);
this.pointMassAPos.sub(this.delta);
this.pointMassBPos.add(this.delta);
}
}
}
function Stick(pointMassA, pointMassB)
{
function pointMassDist(pointMassA, pointMassB)
{
var aXbX, aYbY;
aXbX = pointMassA.getXPos() - pointMassB.getXPos();
aYbY = pointMassA.getYPos() - pointMassB.getYPos();
return Math.sqrt(aXbX * aXbX + aYbY * aYbY);
}
this.length = pointMassDist(pointMassA, pointMassB);
this.lengthSquared = this.length * this.length;
this.pointMassA = pointMassA;
this.pointMassB = pointMassB;
this.delta = new Vector(0.0, 0.0);
this.getPointMassA = function()
{
return this.pointMassA;
}
this.getPointMassB = function()
{
return this.pointMassB;
}
this.scale = function(scaleFactor)
{
this.length *= scaleFactor;
this.lengthSquared = this.length * this.length;
}
this.sc = function(env)
{
var dotProd, scaleFactor;
var pointMassAPos, pointMassBPos;
pointMassAPos = this.pointMassA.getPos();
pointMassBPos = this.pointMassB.getPos();
this.delta.set(pointMassBPos);
this.delta.sub(pointMassAPos);
dotProd = this.delta.dotProd(this.delta);
scaleFactor = this.lengthSquared / (dotProd + this.lengthSquared) - 0.5;
this.delta.scale(scaleFactor);
pointMassAPos.sub(this.delta);
pointMassBPos.add(this.delta);
}
this.setForce = function(force)
{
this.pointMassA.setForce(force);
this.pointMassB.setForce(force);
}
this.addForce = function(force)
{
this.pointMassA.addForce(force);
this.pointMassB.addForce(force);
}
this.move = function(dt)
{
this.pointMassA.move(dt);
this.pointMassB.move(dt);
}
this.draw = function(ctx, scaleFactor)
{
this.pointMassA.draw(ctx, scaleFactor);
this.pointMassB.draw(ctx, scaleFactor);
ctx.lineWidth = 3;
ctx.fillStyle = '#000000';
ctx.strokeStyle = '#000000';
ctx.beginPath();
ctx.moveTo(this.pointMassA.getXPos() * scaleFactor,
this.pointMassA.getYPos() * scaleFactor);
ctx.lineTo(this.pointMassB.getXPos() * scaleFactor,
this.pointMassB.getYPos() * scaleFactor);
ctx.stroke();
}
}
function Spring(restLength, stiffness, damper, pointMassA, pointMassB)
{
this.restLength = restLength;
this.stiffness = stiffness;
this.damper = damper;
this.pointMassA = pointMassA;
this.pointMassB = pointMassB;
this.tmp = Vector(0.0, 0.0);
this.sc = function(env)
{
env.collistion(this.pointMassA.getPos(), this.pointMassA.getPrevPos());
env.collistion(this.pointMassB.getPos(), this.pointMassB.getPrevPos());
}
this.move = function(dt)
{
var aXbX;
var aYbY;
var springForce;
var length;
aXbX = this.pointMassA.getXPos() - this.pointMassB.getXPos();
aYbY = this.pointMassA.getYPos() - this.pointMassB.getYPos();
length = Math.sqrt(aXbX * aXbX + aYbY * aYbY);
springForce = this.stiffness * (length / this.restLength - 1.0);
var avXbvX;
var avYbvY;
var damperForce;
avXbvX = this.pointMassA.getXVel() - this.pointMassB.getXVel();
avYbvY = this.pointMassA.getYVel() - this.pointMassB.getYVel();
damperForce = avXbvX * aXbX + avYbvY * aYbY;
damperForce *= this.damper;
var fx;
var fy;
fx = (springForce + damperForce) * aXbX;
fy = (springForce + damperForce) * aYbY;
this.tmp.setX(-fx);
this.tmp.setY(-ft);
this.pointMassA.addForce(this.tmp);
this.tmp.setX(fx);
this.tmp.setY(ft);
this.pointMassB.addForce(this.tmp);
this.pointMassA.move(dt);
this.pointMassB.move(dt);
}
this.addForce = function(force)
{
this.pointMassA.addForce(force);
this.pointMassB.addForce(force);
}
this.draw = function(ctx, scaleFactor)
{
this.pointMassA.draw(ctx, scaleFactor);
this.pointMassB.draw(ctx, scaleFactor);
ctx.fillStyle = '#000000';
ctx.strokeStyle = '#000000';
ctx.beginPath();
ctx.moveTo(this.pointMassA.getXPos() * scaleFactor,
this.pointMassA.getYPos() * scaleFactor);
ctx.lineTo(this.pointMassB.getXPos() * scaleFactor,
this.pointMassB.getXPos() * scaleFactor);
ctx.stroke();
}
}
function Blob(x, y, radius, numPointMasses)
{
this.x = x;
this.y = y;
this.sticks = new Array();
this.pointMasses = new Array();
this.joints = new Array();
this.middlePointMass;
this.radius = radius;
this.drawFaceStyle = 1;
this.drawEyeStyle = 1;
this.selected = false;
numPointMasses = 8;
var f = 0.1;
var low = 0.95, high = 1.05;
var t, i, p;
function clampIndex(index, maxIndex)
{
index += maxIndex;
return index % maxIndex;
}
for(i = 0, t = 0.0; i < numPointMasses; i++)
{
this.pointMasses[i] = new PointMass(Math.cos(t) * radius + x, Math.sin(t) * radius + y, 1.0);
t += 2.0 * Math.PI / numPointMasses;
}
this.middlePointMass = new PointMass(x, y, 1.0);
this.pointMasses[0].setMass(4.0);
this.pointMasses[1].setMass(4.0);
for(i = 0; i < numPointMasses; i++)
{
this.sticks[i] = new Stick(this.pointMasses[i], this.pointMasses[clampIndex(i + 1, numPointMasses)]);
}
for(i = 0, p = 0; i < numPointMasses; i++)
{
this.joints[p++] = new Joint(this.pointMasses[i], this.pointMasses[clampIndex(i + numPointMasses / 2 + 1, numPointMasses)], low, high);
this.joints[p++] = new Joint(this.pointMasses[i], this.middlePointMass, high * 0.9, low * 1.1); // 0.8, 1.2 works
}
this.addBlob = function(blob)
{
var index = this.joints.length;
var dist;
this.joints[index] = new Joint(this.middlePointMass, blob.getMiddlePointMass(), 0.0, 0.0);
dist = this.radius + blob.getRadius();
this.joints[index].setDist(dist * 0.95, 0.0);
}
this.getMiddlePointMass = function()
{
return this.middlePointMass;
}
this.getRadius = function()
{
return this.radius;
}
this.getXPos = function()
{
return this.middlePointMass.getXPos();
}
this.getYPos = function()
{
return this.middlePointMass.getYPos();
}
this.scale = function(scaleFactor)
{
var i;
for(i = 0; i < this.joints.length; i++)
{
this.joints[i].scale(scaleFactor);
}
for(i = 0; i < this.sticks.length; i++)
{
this.sticks[i].scale(scaleFactor);
}
this.radius *= scaleFactor;
}
this.move = function(dt)
{
var i;
for(i = 0; i < this.pointMasses.length; i++)
{
this.pointMasses[i].move(dt);
}
this.middlePointMass.move(dt);
}
this.sc = function(env)
{
var i, j;
for(j = 0; j < 4; j++)
{
for(i = 0; i < this.pointMasses.length; i++)
{
if(env.collision(this.pointMasses[i].getPos(), this.pointMasses[i].getPrevPos()) == true)
{
this.pointMasses[i].setFriction(0.75);
}
else
{
this.pointMasses[i].setFriction(0.01);
}
}
for(i = 0; i < this.sticks.length; i++)
{
this.sticks[i].sc(env);
}
for(i = 0; i < this.joints.length; i++)
{
this.joints[i].sc();
}
}
}
this.setForce = function(force)
{
var i;
for(i = 0; i < this.pointMasses.length; i++)
{
this.pointMasses[i].setForce(force);
}
this.middlePointMass.setForce(force);
}
this.addForce = function(force)
{
var i;
for(i = 0; i < this.pointMasses.length; i++)
{
this.pointMasses[i].addForce(force);
}
this.middlePointMass.addForce(force);
this.pointMasses[0].addForce(force);
this.pointMasses[0].addForce(force);
this.pointMasses[0].addForce(force);
this.pointMasses[0].addForce(force);
}
this.moveTo = function(x, y)
{
var i, blobPos;
blobPos = this.middlePointMass.getPos();
x -= blobPos.getX(x);
y -= blobPos.getY(y);
for(i = 0; i < this.pointMasses.length; i++)
{
blobPos = this.pointMasses[i].getPos();
blobPos.addX(x);
blobPos.addY(y);
}
blobPos = this.middlePointMass.getPos();
blobPos.addX(x);
blobPos.addY(y);
}
this.setSelected = function(selected)
{
this.selected = selected;
}
this.drawEars = function(ctx, scaleFactor)
{
ctx.strokeStyle = "#000000";
ctx.fillStyle = "#FFFFFF";
ctx.lineWidth = 2;
ctx.beginPath();
ctx.moveTo((-0.55 * this.radius) * scaleFactor, (-0.35 * this.radius) * scaleFactor);
ctx.lineTo((-0.52 * this.radius) * scaleFactor, (-0.55 * this.radius) * scaleFactor);
ctx.lineTo((-0.45 * this.radius) * scaleFactor, (-0.40 * this.radius) * scaleFactor);
ctx.fill();
ctx.stroke();
ctx.beginPath();
ctx.moveTo((0.55 * this.radius) * scaleFactor, (-0.35 * this.radius) * scaleFactor);
ctx.lineTo((0.52 * this.radius) * scaleFactor, (-0.55 * this.radius) * scaleFactor);
ctx.lineTo((0.45 * this.radius) * scaleFactor, (-0.40 * this.radius) * scaleFactor);
ctx.fill();
ctx.stroke();
}
this.drawHappyEyes1 = function(ctx, scaleFactor)
{
ctx.lineWidth = 1;
ctx.fillStyle = "#FFFFFF";
ctx.beginPath();
ctx.arc((-0.15 * this.radius) * scaleFactor,
(-0.20 * this.radius) * scaleFactor,
this.radius * 0.12 * scaleFactor, 0, 2.0 * Math.PI, false);
ctx.fill();
ctx.stroke();
ctx.beginPath();
ctx.arc(( 0.15 * this.radius) * scaleFactor,
(-0.20 * this.radius) * scaleFactor,
this.radius * 0.12 * scaleFactor, 0, 2.0 * Math.PI, false);
ctx.fill();
ctx.stroke();
ctx.fillStyle = "#000000";
ctx.beginPath();
ctx.arc((-0.15 * this.radius) * scaleFactor,
(-0.17 * this.radius) * scaleFactor,
this.radius * 0.06 * scaleFactor, 0, 2.0 * Math.PI, false);
ctx.fill();
ctx.beginPath();
ctx.arc(( 0.15 * this.radius) * scaleFactor,
(-0.17 * this.radius) * scaleFactor,
this.radius * 0.06 * scaleFactor, 0, 2.0 * Math.PI, false);
ctx.fill();
}
this.drawHappyEyes2 = function(ctx, scaleFactor)
{
ctx.lineWidth = 1;
ctx.fillStyle = "#FFFFFF";
ctx.beginPath();
ctx.arc((-0.15 * this.radius) * scaleFactor,
(-0.20 * this.radius) * scaleFactor,
this.radius * 0.12 * scaleFactor, 0, 2.0 * Math.PI, false);
ctx.stroke();
ctx.beginPath();
ctx.arc(( 0.15 * this.radius) * scaleFactor,
(-0.20 * this.radius) * scaleFactor,
this.radius * 0.12 * scaleFactor, 0, 2.0 * Math.PI, false);
ctx.stroke();
ctx.lineWidth = 1;
ctx.beginPath();
ctx.moveTo((-0.25 * this.radius) * scaleFactor,
(-0.20 * this.radius) * scaleFactor);
ctx.lineTo((-0.05 * this.radius) * scaleFactor,
(-0.20 * this.radius) * scaleFactor);
ctx.stroke();
ctx.beginPath();
ctx.moveTo(( 0.25 * this.radius) * scaleFactor,
(-0.20 * this.radius) * scaleFactor);
ctx.lineTo(( 0.05 * this.radius) * scaleFactor,
(-0.20 * this.radius) * scaleFactor);
ctx.stroke();
}
this.drawHappyFace1 = function(ctx, scaleFactor)
{
ctx.lineWidth = 2;
ctx.strokeStyle = "#000000";
ctx.fillStyle = "#000000";
ctx.beginPath();
ctx.arc(0.0, 0.0,
this.radius * 0.25 * scaleFactor, 0, Math.PI, false);
ctx.stroke();
}
this.drawHappyFace2 = function(ctx, scaleFactor)
{
ctx.lineWidth = 2;
ctx.strokeStyle = "#000000";
ctx.fillStyle = "#000000";
ctx.beginPath();
ctx.arc(0.0, 0.0,
this.radius * 0.25 * scaleFactor, 0, Math.PI, false);
ctx.fill();
}
this.drawOohFace = function(ctx, scaleFactor)
{
ctx.lineWidth = 2;
ctx.strokeStyle = "#000000";
ctx.fillStyle = "#000000";
ctx.beginPath();
ctx.arc(0.0, (0.1 * this.radius) * scaleFactor,
this.radius * 0.25 * scaleFactor, 0, Math.PI, false);
ctx.fill();
ctx.beginPath();
ctx.moveTo((-0.25 * this.radius) * scaleFactor, (-0.3 * this.radius) * scaleFactor);
ctx.lineTo((-0.05 * this.radius) * scaleFactor, (-0.2 * this.radius) * scaleFactor);
ctx.lineTo((-0.25 * this.radius) * scaleFactor, (-0.1 * this.radius) * scaleFactor);
ctx.moveTo((0.25 * this.radius) * scaleFactor, (-0.3 * this.radius) * scaleFactor);
ctx.lineTo((0.05 * this.radius) * scaleFactor, (-0.2 * this.radius) * scaleFactor);
ctx.lineTo((0.25 * this.radius) * scaleFactor, (-0.1 * this.radius) * scaleFactor);
ctx.stroke();
}
this.drawFace = function(ctx, scaleFactor)
{
if(this.drawFaceStyle == 1 && Math.random() < 0.05)
{
this.drawFaceStyle = 2;
}
else if(this.drawFaceStyle == 2 && Math.random() < 0.1)
{
this.drawFaceStyle = 1;
}
if(this.drawEyeStyle == 1 && Math.random() < 0.025)
{
this.drawEyeStyle = 2;
}
else if(this.drawEyeStyle == 2 && Math.random() < 0.3)
{
this.drawEyeStyle = 1;
}
if(this.middlePointMass.getVelocity() > 0.004)
{
this.drawOohFace(ctx, scaleFactor);
}
else
{
if(this.drawFaceStyle == 1)
{
this.drawHappyFace1(ctx, scaleFactor, 0.0, -0.3);
}
else
{
this.drawHappyFace2(ctx, scaleFactor, 0.0, -0.3);
}
if(this.drawEyeStyle == 1)
{
this.drawHappyEyes1(ctx, scaleFactor, 0.0, -0.3);
}
else
{
this.drawHappyEyes2(ctx, scaleFactor, 0.0, -0.3);
}
}
}
this.getPointMass = function(index)
{
index += this.pointMasses.length;
index = index % this.pointMasses.length;
return this.pointMasses[index];
}
this.drawBody = function(ctx, scaleFactor)
{
var i;
ctx.strokeStyle = "#000000";
if(this.selected == true)
{
ctx.fillStyle = "#FFCCCC";
}
else
{
ctx.fillStyle = "#FFFFFF";
}
ctx.lineWidth = 5;
ctx.beginPath();
ctx.moveTo(this.pointMasses[0].getXPos() * scaleFactor,
this.pointMasses[0].getYPos() * scaleFactor);
for(i = 0; i < this.pointMasses.length; i++)
{
var px, py, nx, ny, tx, ty, cx, cy;
var prevPointMass, currentPointMass, nextPointMass, nextNextPointMass;
prevPointMass = this.getPointMass(i - 1);
currentPointMass = this.pointMasses[i];
nextPointMass = this.getPointMass(i + 1);
nextNextPointMass = this.getPointMass(i + 2);
tx = nextPointMass.getXPos();
ty = nextPointMass.getYPos();
cx = currentPointMass.getXPos();
cy = currentPointMass.getYPos();
px = cx * 0.5 + tx * 0.5;
py = cy * 0.5 + ty * 0.5;
nx = cx - prevPointMass.getXPos() + tx - nextNextPointMass.getXPos();
ny = cy - prevPointMass.getYPos() + ty - nextNextPointMass.getYPos();
px += nx * 0.16;
py += ny * 0.16;
px = px * scaleFactor;
py = py * scaleFactor;
tx = tx * scaleFactor;
ty = ty * scaleFactor;
ctx.bezierCurveTo(px, py, tx, ty, tx, ty);
}
ctx.closePath();
ctx.stroke();
ctx.fill();
}
this.drawSimpleBody = function(ctx, scaleFactor)
{
for(i = 0; i < this.sticks.length; i++)
{
this.sticks[i].draw(ctx, scaleFactor);
}
}
this.draw = function(ctx, scaleFactor)
{
var i;
var up, ori, ang;
this.drawBody(ctx, scaleFactor);
ctx.strokeStyle = "#000000";
ctx.fillStyle = "#000000"
ctx.save();
ctx.translate(this.middlePointMass.getXPos() * scaleFactor,
(this.middlePointMass.getYPos() - 0.35 * this.radius) * scaleFactor);
up = new Vector(0.0, -1.0);
ori = new Vector(0.0, 0.0);
ori.set(this.pointMasses[0].getPos());
ori.sub(this.middlePointMass.getPos());
ang = Math.acos(ori.dotProd(up) / ori.length());
if(ori.getX() < 0.0)
{
ctx.rotate(-ang);
}
else
{
ctx.rotate(ang);
}
// this.drawEars(ctx, scaleFactor);
this.drawFace(ctx, scaleFactor);
ctx.restore();
}
}
function BlobCollective(x, y, startNum, maxNum)
{
this.maxNum = maxNum;
this.numActive = 1;
this.blobs = new Array();
this.tmpForce = new Vector(0.0, 0.0);
this.selectedBlob = null;
this.blobs[0] = new Blob(x, y, 0.4, 8);
this.split = function()
{
var i, maxIndex = 0, maxRadius = 0.0;
var emptySlot;
var motherBlob, newBlob;
if(this.numActive == this.maxNum)
{
return;
}
emptySlot = this.blobs.length;
for(i = 0; i < this.blobs.length; i++)
{
if(this.blobs[i] != null && this.blobs[i].getRadius() > maxRadius)
{
maxRadius = this.blobs[i].getRadius();
motherBlob = this.blobs[i];
}
else if(this.blobs[i] == null)
{
emptySlot = i;
}
}
motherBlob.scale(0.75);
newBlob = new Blob(motherBlob.getXPos(),
motherBlob.getYPos(), motherBlob.getRadius(), 8);
for(i = 0; i < this.blobs.length; i++)
{
if(this.blobs[i] == null)
{
continue;
}
this.blobs[i].addBlob(newBlob);
newBlob.addBlob(this.blobs[i]);
}
this.blobs[emptySlot] = newBlob;
this.numActive++;
}
this.findSmallest = function(exclude)
{
var minRadius = 1000.0, minIndex;
var i;
for(i = 0; i < this.blobs.length; i++)
{
if(i == exclude || this.blobs[i] == null)
{
continue;
}
if(this.blobs[i].getRadius() < minRadius)
{
minIndex = i;
minRadius = this.blobs[i].getRadius();
}
}
return minIndex;
}
this.findClosest = function(exclude)
{
var minDist = 1000.0, foundIndex, dist, aXbX, aYbY;
var i;
var myPointMass, otherPointMass;
myPointMass = this.blobs[exclude].getMiddlePointMass();
for(i = 0; i < this.blobs.length; i++)
{
if(i == exclude || this.blobs[i] == null)
{
continue;
}
otherPointMass = this.blobs[i].getMiddlePointMass();
aXbX = myPointMass.getXPos() - otherPointMass.getXPos();
aYbY = myPointMass.getYPos() - otherPointMass.getYPos();
dist = aXbX * aXbX + aYbY * aYbY;
if(dist < minDist)
{
minDist = dist;
foundIndex = i;
}
}
return foundIndex;
}
this.join = function()
{
var blob1Index, blob2Index, blob1, blob2;
var r1, r2, r3;
if(this.numActive == 1)
{
return;
}
blob1Index = this.findSmallest(-1);
blob2Index = this.findClosest(blob1Index);
r1 = this.blobs[blob1Index].getRadius();
r2 = this.blobs[blob2Index].getRadius();
r3 = Math.sqrt(r1 * r1 + r2 * r2);
this.blobs[blob1Index] = null;
this.blobs[blob2Index].scale(0.945 * r3 / r2);
this.numActive--;
}
this.selectBlob = function(x, y)
{
var i, minDist = 10000.0;
var otherPointMass;
var selectedBlob;
var selectOffset = null;
if(this.selectedBlob != null)
{
return;
}
for(i = 0; i < this.blobs.length; i++)
{
if(this.blobs[i] == null)
{
continue;
}
otherPointMass = this.blobs[i].getMiddlePointMass();
aXbX = x - otherPointMass.getXPos();
aYbY = y - otherPointMass.getYPos();
dist = aXbX * aXbX + aYbY * aYbY;
if(dist < minDist)
{
minDist = dist;
if(dist < this.blobs[i].getRadius() * 0.5)
{
this.selectedBlob = this.blobs[i];
selectOffset = { x : aXbX, y : aYbY };
}
}
}
if(this.selectedBlob != null)
{
this.selectedBlob.setSelected(true);
}
return selectOffset;
}
this.unselectBlob = function()
{
if(this.selectedBlob == null)
{
return;
}
this.selectedBlob.setSelected(false);
this.selectedBlob = null;
}
this.selectedBlobMoveTo = function(x, y)
{
if(this.selectedBlob == null)
{
return;
}
this.selectedBlob.moveTo(x, y);
}
this.move = function(dt)
{
var i;
for(i = 0; i < this.blobs.length; i++)
{
if(this.blobs[i] == null)
{
continue;
}
this.blobs[i].move(dt);
}
}
this.sc = function(env)
{
var i;
for(i = 0; i < this.blobs.length; i++)
{
if(this.blobs[i] == null)
{
continue;
}
this.blobs[i].sc(env);
}
if(this.blobAnchor != null)
{
this.blobAnchor.sc();
}
}
this.setForce = function(force)
{
var i;
for(i = 0; i < this.blobs.length; i++)
{
if(this.blobs[i] == null)
{
continue;
}
if(this.blobs[i] == this.selectedBlob)
{
this.blobs[i].setForce(new Vector(0.0, 0.0));
continue;
}
this.blobs[i].setForce(force);
}
}
this.addForce = function(force)
{
var i;
for(i = 0; i < this.blobs.length; i++)
{
if(this.blobs[i] == null)
{
continue;
}
if(this.blobs[i] == this.selectedBlob)
{
continue;
}
this.tmpForce.setX(force.getX() * (Math.random() * 0.75 + 0.25));
this.tmpForce.setY(force.getY() * (Math.random() * 0.75 + 0.25));
this.blobs[i].addForce(this.tmpForce);
}
}
this.draw = function(ctx, scaleFactor)
{
var i;
for(i = 0; i < this.blobs.length; i++)
{
if(this.blobs[i] == null)
{
continue;
}
this.blobs[i].draw(ctx, scaleFactor);
}
}
}
function debug(msg, okFunc, cancelFunc)
{
if(confirm(msg) == true && okFunc != null)
{
okFunc();
}
else if(cancelFunc != null)
{
cancelFunc();
}
}
var env;
var width = 600.0;
var height = 400.0;
var scaleFactor = 200.0;
var blobColl;
var gravity;
var stopped;
var savedMouseCoords = null;
var selectOffset = null;
function update()
{
var dt = 0.05;
if(savedMouseCoords != null && selectOffset != null)
{
blobColl.selectedBlobMoveTo(savedMouseCoords.x - selectOffset.x,
savedMouseCoords.y - selectOffset.y);
}
blobColl.move(dt);
blobColl.sc(env);
blobColl.setForce(gravity);
}
function draw()
{
var canvas = document.getElementById('blob');
if(canvas.getContext == null)
{
return;
}
var ctx = canvas.getContext('2d');
ctx.clearRect(0, 0, width, height);
env.draw(ctx, scaleFactor);
blobColl.draw(ctx, scaleFactor);
}
function timeout()
{
draw();
update();
if(stopped == false)
{
setTimeout('timeout()', 30);
}
}
function init()
{
var canvas = document.getElementById('blob');
if(canvas.getContext == null)
{
alert("You need Firefox version 1.5 or higher for this to work, sorry.");
return;
}
document.onkeydown = function(event)
{
var keyCode;
if(event == null)
{
keyCode = window.event.keyCode;
}
else
{
keyCode = event.keyCode;
}
switch(keyCode)
{
// left
case 37:
blobColl.addForce(new Vector(-50.0, 0.0));
break;
// up
case 38:
blobColl.addForce(new Vector(0.0, -50.0));
break;
// right
case 39:
blobColl.addForce(new Vector(50.0, 0.0));
break;
// down
case 40:
blobColl.addForce(new Vector(0.0, 50.0));
break;
// join 'j'
case 74:
blobColl.join();
break;
// split 'h'
case 72:
blobColl.split();
break;
// toggle gravity 'g'
case 71:
toggleGravity();
break;
default:
break;
}
}
function getMouseCoords(event)
{
if(event == null)
{
event = window.event;
}
if(event == null)
{
return null;
}
if(event.pageX || event.pageY){
return {x:event.pageX / scaleFactor, y:event.pageY / scaleFactor};
}
return null;
}
document.onmousedown = function(event)
{
var mouseCoords;
if(stopped == true)
{
return;
}
mouseCoords = getMouseCoords(event);
if(mouseCoords == null)
{
return;
}
selectOffset = blobColl.selectBlob(mouseCoords.x, mouseCoords.y);
}
document.onmouseup = function(event)
{
blobColl.unselectBlob();
savedMouseCoords = null;
selectOffset = null;
}
document.onmousemove = function(event)
{
var mouseCoords;
if(stopped == true)
{
return;
}
if(selectOffset == null)
{
return;
}
mouseCoords = getMouseCoords(event);
if(mouseCoords == null)
{
return;
}
blobColl.selectedBlobMoveTo(mouseCoords.x - selectOffset.x, mouseCoords.y - selectOffset.y);
savedMouseCoords = mouseCoords;
}
env = new Environment(0.2, 0.2, 2.6, 1.6);
blobColl = new BlobCollective(1.0, 1.0, 1, 200);
gravity = new Vector(0.0, 10.0);
stopped = false;
timeout();
}
function stop()
{
stopped = true;
}
function start()
{
stopped = false;
timeout();
}
function toggleGravity()
{
if(gravity.getY() > 0.0)
{
gravity.setY(0.0);
}
else
{
gravity.setY(10.0);
}
}
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