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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Race Simulation</title>
<script type="text/javascript" src="d3.min.js"></script>
<style type="text/css">
.axis path,
.axis line {
fill: none;
stroke: black;
shape-rendering: crispEdges;
}
.axis text {
font-family: sans-serif;
font-size: 11px;
}
</style>
</head>
<body>
<script type="text/javascript">
var w = 1000
var h = 800
var svg = d3.select("body").append("svg").attr("width", w).attr("height", h);
svg.append('image')
// .attr('d',path)
.attr('xlink:href','400m_track.png')
.attr('class', 'pico')
.attr('height', '766')
.attr('width', '100%')
//var path = svg.append("path").attr("d", "M650 550 C 920 550 920 220 650 220").attr({fill:"transparent", stroke:"black", "stroke-width":4});
var path_1 = svg.append("path").attr("d", "M685 548 L740 537 770 527 820 480 845 410 844 360 827 300 790 255 744 230 710 220 300 220 "
+ " 240 237 195 270 163 320 151 370 153 410 170 460 200 500 235 525 277 548 685 548").attr({fill:"transparent", stroke:"black", "stroke-width":4});
var path_2 = svg.append("path").attr("d", "M685 565 L750 555 790 540 830 498 860 440 865 370 850 310 830 270 805 240 735 205 280 205 "
+ " 225 220 165 275 145 310 132 390 140 440 165 490 190 520 250 555 685 565").attr({fill:"transparent", stroke:"transparent", "stroke-width":4});
// path2.node()
// path2.node.getTotalLength()
// path2.node()
svg.append("text").attr("x", 450).attr("y", 450).attr("fill", "black").attr("font-weight", "bold").text("Hello");
// Returns a random number between min (inclusive) and max (exclusive)
function getRandomMaxspeed(min, max)
{
return Math.random() * (max - min) + min;
}
/////////////// VECTOR ///////////////////////
class Vector
{
constructor(x,y)
{
this.x = x;
this.y = y;
}
static add(v1, v2)
{
return new Vector(v1.x + v2.x, v1.y + v2.y)
}
static subtract(v1, v2)
{
return new Vector(v1.x - v2.x, v1.y - v2.y)
}
copy()
{
return new Vector(this.x, this.y);
}
limit(max)
{
var magnitude = this.magnitude();
if(magnitude > max)
{
this.normalize();
this.multiply(max);
}
}
normalize()
{
var magnitude = this.magnitude();
this.x/= magnitude;
this.y/= magnitude;
}
multiply(n)
{
this.x *= n;
this.y *= n;
}
divide(n)
{
this.x /= n;
this.y /= n;
}
add(v)
{
this.x += v.x;
this.y += v.y;
}
magnitude()
{
return Math.sqrt(Math.pow(this.x, 2) + Math.pow(this.y, 2));
}
dot(v)
{
return (this.x * v.x) + (this.y * v.y);
}
static distance(v1, v2)
{
return Math.sqrt((Math.pow(v1.x - v2.x, 2)) + (Math.pow(v1.y - v2.y, 2)));
}
static angleBetween(v1, v2)
{
dot_product = v1.dot(v2);
theta = Math.acos(dot_product/(v1.magnitude() * v2.magnitude()));
return theta;
}
} /// end VECTOR
/////////////// RUNNER ///////////////////////
class Runner
{
constructor(r, color, path, coordinates)
{
this.r = r;
this.color = color;
this.path = path;
this.maxspeed = getRandomMaxspeed(1, 1.5) ; // get a new randomArbitrary to change in-race speeds;
this.maxforce = .3;
this.laps = 0;
this.location = new Vector(coordinates[0], coordinates[1]); //start off wherever mouse is clicked
this.velocity = new Vector(1, 0);//Math.random() * 5;
this.acceleration = new Vector(0, 0);//Vector(-.001, .01);
this.check_lap = true;
//this.mass = 10;
}
get_random_color()
{
var colors = ["red", "green", "blue", "orange"]
var random_color = Math.floor(Math.random()*colors.length);
return colors[random_color];
}
checkEdges()
{
if(this.location.x > w)
{
//this.location.x = 0;
this.velocity.x *= -1;
}
else if(this.location.x < 0)
{
//this.location.x = w;
this.velocity.x *= -1;
}
if(this.location.y > h)
{
//this.location.y = 0;
this.velocity.y *= -1;
}
else if(this.location.y < 0)
{
//this.location.y = h;
this.velocity.y *= -1;
}
}
applyForce(force)
{
//force.divide(mass);
this.acceleration.add(force);
}
update()
{
this.velocity.add(this.acceleration);
this.velocity.limit(this.maxspeed);
this.location.add(this.velocity);
this.acceleration.multiply(0);
if(this.check_lap)
{
if(this.location.x > 685 && this.location.y > 500)
{
this.laps++;
this.check_lap = false;
}
}
else
{
if(this.location.x < 300 && this.location.y < 500)
{
this.adjustMaxspeed();
this.check_lap = true;
}
}
}
getNormalPoint(p, a, b)
{
var ap = Vector.subtract(p, a); // start_to_predicted
var ab = Vector.subtract(b, a); // Vector that points from start to end
ab.normalize(); // Using the dot product for scalar projection
ab.multiply(ap.dot(ab));
var normalPoint = Vector.add(a, ab); // Finding the normal point along the line segment
return normalPoint;
}
adjustMaxspeed()
{
this.maxspeed = getRandomMaxspeed(1, 1.5);
}
seek(target)
{
var desired = Vector.subtract(target, this.location);
// If the magnitude of desired equals 0, skip out of here
// (We could optimize this to check if x and y are 0 to avoid mag() square root
if (desired.magnitude() == 0) return;
desired.normalize();
desired.multiply(this.maxspeed);
var steer = Vector.subtract(desired, this.velocity);
//steer.limit(this.maxforce);
this.applyForce(steer);
// if() {adjustMaxspeed();}
}
follow()
{
var normal;
var target;
// Step 1: Predict the vehicle’s future location.
var predict = this.velocity.copy();
predict.normalize();
predict.multiply(25); // <----------------- play around with value; maybe base it on speed
var predicted_location = Vector.add(this.location, predict);
// Step 2: Find the normal point along the path.
var world_record = 1000000; // start with a very high record distance that can easily be beaten
// Loop through all points of the path
for(var i=0; i<this.path.points.length - 1; i++)
{
var a = this.path.points[i];
var b = this.path.points[i+1];
var normalPoint = this.getNormalPoint(predicted_location, a, b);
if(normalPoint.x < Math.min(a.x, b.x) || normalPoint.x > Math.max(a.x, b.x))
{
normalPoint = b.copy();
}
var distance = Vector.distance(predicted_location, normalPoint);
if (distance < world_record)
{
world_record = distance;
normal = normalPoint;
var direction = Vector.subtract(b, a);
direction.normalize();
direction.multiply(25); // 10 <------ Should be based on distance to path & velocity
target = Vector.add(normalPoint, direction);
}
}
// Step 4: If we are off the path, seek that target to stay on the path.
if (world_record > this.path.radius)
{
this.seek(target);
}
}
separate(otherRunners)
{
var desired_separation = 25;
var sum = new Vector(0, 0);
var count = 0;
var change_lanes = true;
// check to see if any Runners are too close (exceeed the desired_separation)
for(var i = 0; i < otherRunners.length; i++)
{
var dist = Vector.distance(this.location, otherRunners[i].location);
if((dist > 0) && (dist < desired_separation))
{
var diff = Vector.subtract(this.location, otherRunners[i].location);
diff.normalize()
sum.add(diff); // accumulate the Vector forces from close Runners
count++;
var x_dist = this.location.x - otherRunners[i].location.x;
var y_dist = Math.abs(this.location.y - otherRunners[i].location.y);
if((this.location.y < 370) && (x_dist > 0) && y_dist < 8)
{
this.path = path2;
}
else if((this.location.y > 370) && (x_dist < 0) && y_dist < 8)
{
this.path = path2;
}
}
var x_spacing = Math.abs(this.location.x - otherRunners[i].location.x);
if(x_spacing > 0 && x_spacing < 30)
{
change_lanes = false;
}
}
if(count > 0)
{
sum.divide(count); // average the Vector forces
sum.normalize();
sum.multiply(this.maxspeed);
var steer = Vector.subtract(sum, this.velocity)
steer.limit(this.maxforce);
this.applyForce(steer);
}
if(change_lanes)
{
this.path = path1;
}
}
finish()
{
this.acceleration.x = -.01;
if(this.velocity.x > 0)
{
this.velocity.add(this.acceleration);
this.velocity.limit(this.maxspeed);
this.location.add(this.velocity);
//this.acceleration.multiply(0);
}
}
} /// end RUNNER
class Path
{
constructor(path_arr_of_objs)
{
this.points = [];
this.radius = 5; // how much a Runner can stray from the line
for(var i = 0; i < path_arr_of_objs.length; i++)
{
var p = path_arr_of_objs[i];
this.points.push(new Vector(p.x, p.y)); // turns the json objects into Vectors
}
}
}
///////////////////////////////////////////////
var path1_arr =
[{x:685, y:548}, {x:740, y:537}, {x:770, y:527}, {x:820, y:480}, {x:845, y:410}, {x:844, y:360}, {x:827, y:300}, {x:790, y:255},
{x:744, y:230}, {x:710, y:220}, {x:300, y:220}, {x:240, y:237}, {x:195, y:270}, {x:163, y:320}, {x:151, y:370}, {x:153, y:410},
{x:170, y:460}, {x:200, y:500}, {x:235, y:525}, {x:277, y:548}, {x:685, y:548}];
var path2_arr =
[{x:685, y:565}, {x:750, y:555}, {x:790, y:540}, {x:830, y:498}, {x:860, y:440}, {x:865, y:370}, {x:850, y:310}, {x:830, y:270},
{x:805, y:240}, {x:735, y:205}, {x:280, y:205}, {x:225, y:220}, {x:165, y:275}, {x:145, y:310}, {x:132, y:390}, {x:140, y:440},
{x:165, y:490}, {x:190, y:520}, {x:250, y:555}, {x:685, y:565}];
var path1 = new Path(path1_arr); // path for Lane 1
var path2 = new Path(path2_arr); // path for Lane 2
var runners = []; // the dataset
// ################################################################################## //
d3.select("svg").on("click", function()
{
// get the mouse position coordinates
var coordinates = [0, 0];
coordinates = d3.mouse(this);
runners.push(new Runner(8, "blue", path1, coordinates));
var circles = svg.selectAll("circle") //Select all circles
.data(runners);
circles.enter()
.append("circle")
.attr({cx:0, cy:0, fill: function(d){return d.get_random_color()}}) // could also set fill to d.color to use the Runner's instantiated color
.attr("r", function(d){return d.r})
//.transition()
//.duration(2000)
//.attr("transform", translator()); //"translate(" + points[0] + ")")
//.each("end", transition);
transition();
function transition()
{
circles.transition()
.duration(10000)
//.attrTween("transform", translateAlong(path.node(),path2.node()))
.attrTween("transform", mover())
.each("end", transition);
}
function mover() /// the function that is called after every "draw"/(.attrTween) cycle
{
return function(d, i, a)
{
return function(t)
{
svg.select("text").text(Math.floor(t * 100));
if (d.laps < 2)
{
d.separate(runners);
d.follow();
d.checkEdges(); // make sure objects remain on screen; bounce back
d.update(); // update the object's position
}
else
{
d.finish();
}
// return the updated translated position
return "translate(" + d.location.x + "," + d.location.y + ")";
};
};
}
});
</script>
<svg width="800" height="800">
<circle cx="155" cy="155" r="122" fill="blue" stroke="gray" stroke-width="12" opacity=".5"></circle>
</svg>
</body>
</html>