Trivial but useful extension method

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Don’t know why I didn’t write this before; it makes code very readable. Often when you write anything graphics related, you want to constrain coordinates to window edges (for example).

So a simple method:

    1: /// <summary>

    2: /// Ensure that the given number falls within the

    3: /// given min/max constraints.

    4: /// </summary>

    5: public static double Constrain( this double num,

    6:                         double min, double max )

    7: {

    8:     if (num < min)

    9:         return min;

   10:     else if (num > max)

   11:         return max;

   12:     else

   13:         return num;

   14: }

It’s just a Floor combined with a Ceiling, but it reads nicely:

    1: xform.X = dx.Constrain(-this.ActualWidth, 0 );

    2: xform.Y = dy.Constrain(-this.ActualHeight, 0 );

 

Avi