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              <!--optimized for google chrome-->
<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <link rel="icon" type="image/ico" href="../icon.ico">
    <link rel="stylesheet" href="style.css">
    <title>Tree</title>
    <script src="tree.js"></script>
</head>
<body>
     <div id="top">
        <input id="tree resistance" value="5" type="range" max="40" min="1" step="0.1">
        <button id="generateTree"  onclick="generateTree()">Generate</button>
        <input id="wind force" value="10" type="range" max="100" min="0" step="0.1">
    </div>
    <div id="center">
        <canvas id="c2"></canvas>
    </div>
    <div id="footer">
        <a href="http://pjoy.fr" target="_blank" class="basic">My site</a>
    </div>
</body>
</html>
            
          
!
            
              body{
    background-color: lightgrey;
    font-family: "HelveticaNeue-Light", "Helvetica Neue Light", "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif;
    text-align: center;
    overflow: -moz-scrollbars-vertical;
    overflow-x: hidden;
    overflow-y: auto;
}

#top {
    /*background: #F00;*/
    padding-bottom: 5px;
    width: 70%;
    left: 50%;
    min-width: 800px;
    margin: auto;
}

#footer {
    position: fixed;
    left: 0;
    bottom: 0;
    right: 0;
    height: 20px;
    z-index: -1;
}

button {
    width: 70px;
}

#c2 {
    margin: auto;
    background-color: dimgrey;

    /*margin-bottom: 100px;*/
    /*display: block;*/
    /*margin : 0 auto;*/
}

.basic {
    text-decoration: none;
    color: #5e9ed4;
}

input[type=range] {
    /*removes default webkit styles*/
    -webkit-appearance: none;

    /*fix for FF unable to apply focus style bug */
    border: 1px solid white;

    /*required for proper track sizing in FF*/
    width: 40%;
}
input[type=range]::-webkit-slider-runnable-track {
    width: 300px;
    height: 5px;
    background: #ddd;
    border: none;
    border-radius: 3px;
}
input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    border: none;
    height: 16px;
    width: 16px;
    border-radius: 50%;
    background: dimgrey;
    margin-top: -4px;
}
input[type=range]:focus {
    outline: none;
}
input[type=range]:focus::-webkit-slider-runnable-track {
    background: #ccc;
}

input[type=range]::-moz-range-track {
    width: 300px;
    height: 5px;
    background: #ddd;
    border: none;
    border-radius: 3px;
}
input[type=range]::-moz-range-thumb {
    border: none;
    height: 16px;
    width: 16px;
    border-radius: 50%;
    background: dimgrey;
}

/*hide the outline behind the border*/
input[type=range]:-moz-focusring{
    outline: 1px solid white;
    outline-offset: -1px;
}

input[type=range]::-ms-track {
    width: 300px;
    height: 5px;

    /*remove bg colour from the track, we'll use ms-fill-lower and ms-fill-upper instead */
    background: transparent;

    /*leave room for the larger thumb to overflow with a transparent border */
    border-color: transparent;
    border-width: 6px 0;

    /*remove default tick marks*/
    color: transparent;
}
input[type=range]::-ms-fill-lower {
    background: #777;
    border-radius: 10px;
}
input[type=range]::-ms-fill-upper {
    background: #ddd;
    border-radius: 10px;
}
input[type=range]::-ms-thumb {
    border: none;
    height: 16px;
    width: 16px;
    border-radius: 50%;
    background: dimgrey;
}
input[type=range]:focus::-ms-fill-lower {
    background: #888;
}
input[type=range]:focus::-ms-fill-upper {
    background: #ccc;
}



            
          
!
            
              /**
* Created by Pierre on 09/11/2014.
 * Note : Branches actually represents roots and vice versa.
 *
 * Please notify me if you are planning to use my work, feel free to contact me for anything else.
 * pjoy.fr | portejoiepierre@gmail.com
*/

var DYNAMICVALUES = true;
//tree
var tree_resistance,
    recursive_order,
    tree_height,
    root_length,
    branch_number = 5,
    leaf_factor = 3,
    root_angle = 16;
//wind
var wind_force,
    wind_angle,
    max_ran_wind_x = 30,
    max_ran_wind_y = 30;
//structure
var canvas,
    ctx,
    tree,
    wind,
    boundx,
    boundy;

window.requestAnimFrame =
    window.requestAnimationFrame ||
    window.webkitRequestAnimationFrame ||
    window.mozRequestAnimationFrame ||
    window.oRequestAnimationFrame ||
    window.msRequestAnimationFrame ||
    function (callback) {
        window.setTimeout(callback, 1000 / 60);
    };

var Point = function(x,y,l){
    this.origX = x;
    this.origY = y;
    this.x = x;
    this.y = y;
    this.l = l;
    this.isBranch = 0;
    this.linkedPoints = [];
    this.linkLength = [];
};

Point.prototype.lineColor = function(){
    if (this.isBranch)             return "#79F8F8";
    if (this.l == recursive_order) return "#79F8F8";
    if (this.l == 0)               return "#FFFF00";
    if (this.l == 1)               return "#FF4455";
    if (this.l == 4)               return "#76F8F8";
};

Point.prototype.draw = function(){
    var i = this.linkedPoints.length;
    while (i--)
    {
        if (this.isBranch) ctx.arc(this.x,this.y, 4*this.l+4, 0, Math.PI*2);
        else ctx.arc(this.x,this.y, 2*this.l+leaf_factor, 0, Math.PI*2);
        ctx.moveTo(this.x,this.y);
        ctx.lineTo(this.linkedPoints[i].x, this.linkedPoints[i].y);
        ctx.lineWidth = this.linkedPoints[0].l/2;
        ctx.strokeStyle = this.lineColor();
    }
};

Point.prototype.applyForce = function(v, a){
    // for the forces applied to to point, I considered the branch as a torsion spring, applying a force of magnitude k*(teta-teta0)
    // the wind applies a force of magnitude v with a reference angle a (in canvas coordinates)
    var alpha, beta;
    var r;
    var f = 1;
    var l = 1;

    //angle between the segment linking the point to its attach point and the canvas abscissa
    alpha = Math.atan(((this.y-this.linkedPoints[0].y)/(this.x-this.linkedPoints[0].x)));
    //angle between the segment linking the original point (at t0) to its attach point and the canvas abscissa
    beta = Math.atan(this.origY/this.origX);

    if (this.x < this.linkedPoints[0].x) { l=-l; f=-1; }
    l *= this.linkLength[0];
    f *= Math.cos(alpha-a)*v;

    if (this.origX == 0){
        if ((this.x - this.linkedPoints[0].x) < 0) {
            alpha -=Math.PI;
            l = -l;
        }
    }
    else if ((this.origX) / (Math.abs(this.origX)) != ((this.x - this.linkedPoints[0].x) / Math.abs(this.x - this.linkedPoints[0].x))) {
        if ((this.origX) / (Math.abs(this.origX)) == 1){
            if ((this.origY) / (Math.abs(this.origY)) == 1){
                alpha += Math.PI;
                l = -l;
            }
            else {
                alpha -= Math.PI;
                l = -l;
            }
        }
        else{
            if ((this.origY) / (Math.abs(this.origY)) == 1){
                alpha -= Math.PI;
                l = -l;
            }
            else {
                alpha += Math.PI;
                l = -l;
            }
        }
    }
    r = -(alpha-beta)*(this.l+1)*0.01*tree_resistance;

    //sum of the forces. f : wind force resulting angle, r : branch reaction resulting angle
    this.x = this.linkedPoints[0].x + Math.cos(alpha+f+r)*l;
    this.y = this.linkedPoints[0].y + Math.sin(alpha+f+r)*l;
};

var Structure = function(){
    this.points = [];

    var start_x = boundx/2;
    var start_y = boundy/1.75;
    var start_y2 = boundy/1.75 - root_length/3;
    var p = new Point(start_x,start_y, 7);
    var p2 = new Point(start_x,start_y2,5);

    this.points.push(p);
    p2.linkedPoints.push(p);
    this.points.push(p2);

    this.recursiveRoot(start_x, start_y2, 270,root_length, recursive_order, this);
    this.recursiveBranch(start_x, start_y, 'y', tree_height, 2, this);
};

Structure.prototype.recursiveRoot = function self (x, y, a, l, r, struct){
    l = l/1.75;
    var maxAngle = 90;
    var b = a;
    var i = 0;
    while (maxAngle > 0) {
        i++;
        maxAngle -= root_angle;
        if (maxAngle > 0) b -= root_angle;
    }
    //number of branches
    var iMax = i*2-1;

    for (i=0; i<iMax; i++)
    {
        var newl = l/2;
        if (i%2 == 0) newl = 0.9*l;
        if (i == (iMax-1)/2 || i == iMax/2 ) newl = l*1.1;

        newx = x + (newl)*Math.cos(b/180*Math.PI);
        newy = y + (newl)*Math.sin(b/180*Math.PI);

        var p = new Point(newx,newy,r);

        if (r == recursive_order) p.linkedPoints.push(struct.points[1]);
        else if (r == 0) p.linkedPoints.push(struct.points[struct.points.length - 1 - i]);
        else {
            var linkedIndex = i*Math.round(Math.pow(iMax,r)*(1-(1)/(1-(iMax)))+(1)/(1-(iMax)));
            p.linkedPoints.push(struct.points[struct.points.length -1  -linkedIndex]);
        }

        var length = Math.sqrt(Math.pow(p.linkedPoints[0].y-p.y,2)+Math.pow(p.linkedPoints[0].x-p.x,2));

        p.linkLength.push(length);
        p.origX = p.x- p.linkedPoints[0].x;
        p.origY = p.y- p.linkedPoints[0].y;

        struct.points.push(p);
        if (r > 0) self(newx,newy,b,newl,r-1,struct);
        maxAngle += root_angle;
        if (maxAngle < 180) b += root_angle;
    }
};

Structure.prototype.recursiveBranch = function self (x,y,d,l,r,struct){
    for (var i = 1; i < branch_number+2; i++)
    {
        var newx = x;
        var newy = y;
        var newd;
        if (d == 'x') {
            l=l*1.05;
            newx = x + (i/(branch_number+1))*l;
            newd = 'y';
        }
        else {
            l=l*0.95;
            newy = y + (i/(branch_number+1))*l;
            newd = 'x';
        }
        var p = new Point(newx, newy, r);
        p.isBranch = 1;

        if (i==1){
            if (r==2){
                p.linkedPoints.push(struct.points[0])
            }
            else p.linkedPoints.push(struct.points[struct.points.length - 1])
        }
        else if (r == 0) {
            p.linkedPoints.push(struct.points[struct.points.length - 1])
        }
        else {
            var linkedIndex = Math.pow(branch_number,r-1)*(branch_number+1-(branch_number+1)/(1-branch_number))+(branch_number+1)/(1-branch_number);
            p.linkedPoints.push(struct.points[struct.points.length - 1 - (linkedIndex)]);//-1 ?
        }
        struct.points.push(p);

        if (r > 0)
        {
            var direction = 1;
            if (i%2==0) direction = -1;
            if (i > 0 && i < branch_number+1) self(newx, newy, newd, direction*l*((i))/(branch_number+1), r-1, struct);
        }
    }
};

Structure.prototype.draw = function(){
    var i = this.points.length;
    while (i--)
    {
        ctx.beginPath();
        this.points[i].draw();
        ctx.stroke();
    }
};

Structure.prototype.applyForces = function(){
    for (var i = 1; i < this.points.length; i++) {
        if (this.points[i].l < 4 ) {
            if (!this.points[i].isBranch) this.points[i].applyForce(wind_force, wind_angle * Math.PI / 180);
        }
    }
};

var RandomWind = function(){
    this.increment =0;
    this.step = 0;
    this.sign = 1;
    this.ran_value = 1;
    this.max = 0;

    this.angle = 0;
    this.force = 0;
};

RandomWind.prototype.getRandom = function(){
    this.increment++;
    this.ran_value += this.step*this.sign;
    if ( Math.abs(this.ran_value) > this.max || Math.abs(this.ran_value) > max_ran_wind_y ){
        //this.ran_value = this.max*this.sign;
        if (this.sign == 1) this.sign = -1;
        else this.sign = 1;

        this.max = (Math.random()+0.1)*max_ran_wind_y;
        this.step = max_ran_wind_y/((Math.random()+0.3)*max_ran_wind_x);
        this.ran_value += this.step*this.sign ;
    }
    this.force=(0.01+0.01*Math.cos(this.increment*0.01))*2;
    this.angle=wind.ran_value+90;
};

function start(){
    canvas.width = window.innerWidth*0.8;
    canvas.height = window.innerHeight*0.99-60;
    boundx = canvas.width;
    boundy = canvas.height;

    if (DYNAMICVALUES) {
        root_length = window.innerHeight*0.25;
        tree_height = window.innerHeight*0.5;

        if      (root_angle > 60) recursive_order = 5;
        else if (root_angle > 45) recursive_order = 4;
        else if (root_angle > 30) recursive_order = 3;
        else if (root_angle > 15) recursive_order = 2;
        else if (root_angle > 4)  recursive_order = 1;
        else                      recursive_order = 0;
    }

    ctx.clearRect(0, 0, canvas.width, canvas.height);

    wind = new RandomWind();
    tree = new Structure();
    tree.draw();
}

function restart(){
    start()
}

function generateTree(){
    leaf_factor = Math.random()*3;
    root_angle =  Math.floor(Math.random()*68)+3;
    resetParameters();
    restart();
}

function resetParameters(){
    document.getElementById('wind force').value=10;
    document.getElementById('tree resistance').value=5;
}

function updateConditions(){
    if(DYNAMICVALUES) {
        wind.getRandom();
        wind_force = wind.force + 0.001*parseInt(document.getElementById('wind force').value);
        tree_resistance = parseInt(document.getElementById('tree resistance').value);
        wind_angle = wind.angle;
    }
}

function update() {
    updateConditions();

    ctx.clearRect(0, 0, canvas.width, canvas.height);
    tree.applyForces();
    tree.draw();
    requestAnimFrame(update);
}

window.onload  = function(){
    canvas = document.getElementById('c2');
    ctx = canvas.getContext('2d');
    start();
    update();
};

window.onresize = function() {
    restart()
};

            
          
!
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