This is an application that can be used to test addition of vectors.
When the application starts, two random vectors A and B are generated.
Down in the left corner you see a red vector S.
Move and change this vector to visualize the vector sum of A and B.
Then click the button 'Submit'.
You will have a respons wether your answer is correct or not.
Click the button 'Next' to have a new exercise.
'Snap to grid' is used which means that both the startpoint and the endpoint of the vectors
always are placed at corners (points (x,y) always have x and y as integers).