dist(x1, y1, x2, y2)
Calculates the distance between two points.
Type: function
Parameter(s):
- x1 {Number}:
The x-coordinate of the first point.
 - y1 {Number}:
The y-coordinate of the first point.
 - x2 {Number}:
The x-coordinate of the second point.
 - y2 {Number}:
The y-coordinate of the second point.
 
Returns:
- 
    {Number}:
The distance.