Drag around the red dots to change the shape. When you hover over it, the x and y coordinates will pop up. You can also press space to make the dots disappear so you can see your shape.
NOTES: ~The Qs show what quadrant they are in. If they are on the x-axis or the y-axis, it will say 0. CREDITS: ~All by me except for the grid. The grid was on google.