EJS version of Vector addition (sum of two vectors)

This is EJS version of vector addition.

The applet shows how vector $\vec{C}=\vec{A}+\vec{B}$ was calculated.
1. Calculate X,Y components of vector $\vec{A},\vec{B}$ ,
   $\vec{C}_x=\vec{A}_x+\vec{B}_x$ and $\vec{C}_y=\vec{A}_y+\vec{B}_y$
2. If you un-check x-y mode:
  The sum is equal to sum of parallel components of $\vec{A},\vec{B}$ in the direction of $vec{C}$ ,
   $\vec{C}=\vec{A}_p +\vec{B}_p$
  and the normal component of $\vec{A},\vec{B}$ always cancel out with each other. i.e.
   $\vec{A}_n+\vec{B}_n=0$ or $\vec{A}_n= -\vec{B}_n$

You can select to operate in C=A+B , A=C-B or B=C-A mode.

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