Use The 'restart' button to regenerate points and start the convex hull algorithm over again.
If you check the 'place points' checkbox you will be able to place the points manually and the convex hull algorithm will start when the number of points reaches the number specified in the 'number of points' textbox. When the 'place points checkbox is checked there will be a number in top left corner of the canvas, it is this number of points out of the set number.
Elements of the Sketch
- White dots - all points that get surrounded by the hull
- Red dots - all the vertices of the hull
- Large redish/pink dot - point most recently added to the hull
- Large green dot - the leftmost point