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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

            
              <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <script src="jquery-3.2.1.min.js"></script>
    <script src="main.js"></script>
    <title>Document</title>
</head>
<body>
    <canvas id="myCanvas" width="800" height="400" style="border:1px solid black"></canvas>
    <br>
    <input type="number" id="walls" min="5" max="20" value="10">
    <button onclick="generateWalls()">Generate Walls</button>
</body>
</html>
            
          
!

CSS

            
              input[type="number"]
        {
            margin:10px;
            padding:10px;
            text-align: center;
            border:none;
            border-bottom: 2px solid darkslategray;
            color: darkslategray;
        }

        button
        {
            margin:10px;
            padding:10px 5px;
            background-color:darkslategray;
            border:none;
            outline:none;
            color:white;
            border-radius: 10px;
            transition: 0.2s; 
        }

        button:hover
        {
            background-color: chartreuse;
        }

        button:active
        {
            background-color: aquamarine;
        }
            
          
!

JS

            
              var canvas;
var ctx;

class Vector2
{
    constructor(context)
    {
        if(context.x != null && context.y != null)
        {
            this.x = context.x;
            this.y = context.y;
        }
        else if(context.position != null)
        {
            this.x = context.position.x;
            this.y = context.position.y;
        }
        else if(context instanceof Vector2)
        {
            this.x = context.x;
            this.y = context.y;
        }
        else{
            this.x = 0;
            this.y = 0;
        }
    }
    
    setVector2(context)
    {
        if(context.x != null && context.y != null)
        {
            this.x = context.x;
            this.y = context.y;
        }
        else if(context.position != null)
        {
            this.x = context.position.x;
            this.y = context.position.y;
        }
    }

    static distance(v1,v2)
    {
        var x=v1.x-v2.x;
        var y=v1.y-v2.y;
        return Math.sqrt(x*x + y*y);
    }

    static Subtract(v1,v2)
    {
        return new Vector2({
            x:v1.x-v2.x,
            y:v1.y-v2.y
        });
    }

    static Cross(v1,v2)
    {
        return v1.x * v2.y - v1.y *v2.x;
    }
}

class WorldObject
{
    constructor(context)
    {
        if(context.position!=null)
        {
            this.position = new Vector2(context.position);
        }

        if(context.color !=null)
        {
            this.color = context.color;
        }
        else{
            this.color = '#' + (function co(lor){   
                return (lor += [0,1,2,3,4,5,6,7,8,9,'a','b','c','d','e','f'][Math.floor(Math.random()*16)]) && (lor.length == 6) ?  lor : co(lor); })('');
        }

        if(context.rotation!=null)
        {
            this.rotation = context.rotation;
        }
        else{
            this.rotation = 0;
        }
    }
}


class RayCasterSource extends WorldObject
{
    //PARAMS: position,color,rayColor,rayLength,rotation,followMouse
    constructor(context)
    {
        super(context);

        if(context.rayColor !=null)
        {
            this.rayColor = context.rayColor;
        }
        else{
            this.rayColor = '#' + (function co(lor){   
                return (lor += [0,1,2,3,4,5,6,7,8,9,'a','b','c','d','e','f'][Math.floor(Math.random()*16)]) && (lor.length == 6) ?  lor : co(lor); })('');
        }

        if(context.followMouse!=null && context.followMouse==false)
        {
            if(context.rayLength!=null)
            {
                this.rayLength = context.rayLength;
            }
            else{
                this.rayLength=10;
            }
        }
        this.intersection=null;
    }

    draw()
        {
            ctx.fillStyle=this.color;
            ctx.beginPath();
            ctx.ellipse(this.position.x,this.position.y,10,10,0,0,2*Math.PI,false);
            ctx.fill();

            ctx.strokeStyle=this.rayColor;
            ctx.lineWidth=2;
            ctx.beginPath();
            ctx.moveTo(this.position.x,this.position.y);
            if(this.intersection!=null)
            {
                ctx.lineTo(this.intersection.x,this.intersection.y);
                ctx.stroke();
                ctx.beginPath();
                ctx.fillStyle="#00ff00";
                ctx.ellipse(this.intersection.x,this.intersection.y,2,2,0,0,2*Math.PI,false);
                ctx.fill();
            }
            else{
                ctx.lineTo(mousePos.x,mousePos.y);
                ctx.stroke();
            }
            

        }
}

class walls extends WorldObject
{
    constructor(context)
    {
        super(context);
        if(context.width !=null)
        {
            this.width = context.width;
        }
        else{
            this.width = 50;
        }

        if(context.height !=null)
        {
            this.height = context.height;
        }
        else{
            this.height = 50;
        }
    }

    getBoundingRect()
    {
        var r = Math.sqrt((this.width*this.width)/4 + (this.height*this.height)/4);
        var angle = Math.atan2(this.height,this.width)*180/Math.PI;
        var angles=[angle,180-angle,180+angle,360-angle];
        var points = [];
        for(var i=0;i<angles.length;i++)
        {
            points.push(new Vector2({
                x:this.position.x + r*Math.cos((this.rotation+angles[i])*Math.PI/180),
                y:this.position.y + r*Math.sin((this.rotation+angles[i])*Math.PI/180)
            }));
        }
        return points;
    }

    draw()
    {
        this. points = this.getBoundingRect();
        ctx.fillStyle=this.color;
        ctx.beginPath();
        ctx.moveTo(this.points[0].x,this.points[0].y);
        ctx.lineTo(this.points[1].x,this.points[1].y);
        for(var i=1;(i+1)%this.points.length!=1;i=(i+1)%this.points.length)
        {
            ctx.lineTo(this.points[i].x,this.points[i].y);
        }
        ctx.fill();
        ctx.fillStyle='#ff0000';
        ctx.beginPath();
        ctx.ellipse(this.position.x,this.position.y,2,2,0,0,2*Math.PI,false);
        ctx.fill();
        ctx.fillStyle='#0000ff';
        for (let index = 0; index < this.points.length; index++) {
            ctx.beginPath();
            ctx.ellipse(this.points[index].x,this.points[index].y,2,2,0,0,2*Math.PI,false);    
            ctx.fill();
        }
        
    }


}

RayCasterSource.prototype.lineIntersection=function(c,d)
{

    var r = Vector2.Subtract(mousePos,this.position);
    var s = Vector2.Subtract(d,c);
    var rs_cross = Vector2.Cross(r,s);
    var num1 = Vector2.Cross(Vector2.Subtract(c,this.position),s);
    var num2 = Vector2.Cross(Vector2.Subtract(this.position,c),r);
    var t =num1/rs_cross;
    var u =-num2/rs_cross; 

    if(t>=0&&t<=1 && u>=0 && u<=1)
    {
        var t = new Vector2({
            x: this.position.x + t*r.x,
            y: this.position.y + t*r.y
        });
        
        if(this.intersection != null)
        {
            var d_new = Vector2.distance(t,this.position);
            var d_prev = Vector2.distance(this.intersection,this.position);
            if(d_new<d_prev)
            {
                this.intersection = t;
            }
            
        }
        else{
            this.intersection = t; 
        }
    }
}

var getIntersections = function(source)
{
    source.intersection=null;
    for(var j=0;j<w.length;j++)
    {
        source.lineIntersection(w[j].points[0],w[j].points[1]);
        for (var i = 1; i%w[j].points.length !=0; i=(i+1)%w[j].points.length) {
            source.lineIntersection(w[j].points[i],w[j].points[(i+1)%w[j].points.length]);    
        }
    }   
}


function getMousePos(canvas, evt) {
	var rect = canvas.getBoundingClientRect();
	return {
		x: evt.clientX - rect.left,
		y: evt.clientY - rect.top
	};
}





function loop()
{
    ctx.clearRect(0,0,canvas.width,canvas.height);
    for (var index = 0; index <w.length ; index++) {
        w[index].draw();
    }

    getIntersections(source1);
    getIntersections(source2);
    
    source1.draw();
    source2.draw();
}


var mousePos = new Vector2({x:0,y:0});
var source1 = new RayCasterSource({
    position:new Vector2({x:400,y:200}),
    color:'#00ff00',
    rayColor:'#ffff00',
    followMouse:true
});

var source2 = new RayCasterSource({
    position:new Vector2({x:200,y:300}),
    color:'#00ff00',
    rayColor:'#ff00ff',
    followMouse:true
});

var w=[];
function generateWalls()
{
    w=[];
    for (var index = 0; index < parseInt($('#walls').val()); index++) {
        w.push(new walls({
            position:new Vector2({x:Math.floor(Math.random()*800),y:Math.floor(Math.random()*400)}),
            rotation:Math.floor(Math.random()*360),
            color:'#232323',
            width:50,
            height:20
        }));
    }
}


$('document').ready(function(){
    canvas = document.getElementById("myCanvas");
    ctx = canvas.getContext("2d");
    generateWalls()
    $('#myCanvas').on('mousemove',function(evt){
        mousePos.setVector2(getMousePos(canvas,evt));
    });

    setInterval(loop,1000/60);
});
            
          
!
999px

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