function Point(x,y)
{
    this.x = x;
    this.y = y;
}

Point.prototype = 
{
    add: function(point)
    {
        this.x += point.x;
        this.y += point.y;
    },
    
    subtract: function(point)
    {
        this.x -= point.x;
        this.y -= point.y;
    },
    
    scale: function(multiplier)
    {
        this.x *= multiplier;
        this.y *= multiplier;
    },
    
    min: function(x,y)
    {
        if (this.x < x)
            this.x = x;
        if (this.y < y)
            this.y = y;
        
    },
    
    max: function(x,y)
    {
        if (this.x > x)
            this.x = x;
        if (this.y > y)
            this.y = y;    
    },

    copy: function(point)
    {
        this.x = point.x;
        this.y = point.y;
    },

    init: function()
    {
        this.x = this.y = 0;
    }
}