Canvas Circle Object. Looking for advice as to improve this.

Canvas Circle Object

window.onload = function(){
    var canvas = document.getElementById('canvas');
    var context = canvas.getContext('2d');
    canvas.width = 500;
    canvas.height = 500;

    function Circle(posX,posY,r,c,lw,s){
    	this.x = posX;
    	this.y = posY;
    	this.radius = r;
    	this.color = c;
    	this.lineWidth = lw;
    	this.strokeStyle = s;


    	context.beginPath();
        context.arc(this.x,this.y,this.radius, 0, 2 * Math.PI, false);
        context.fillStyle = '#'+this.color;
        context.fill();
        context.lineWidth = this.lineWidth;
        context.strokeStyle = '#'+this.strokeStyle;
        context.stroke();
    }
    
    var circle = new Circle(50,50,20, "0000ff", 2, "ff0000");
}