Add additional features to existing project

1- to add a control (like zoom) that would allow me to increase or decrease the size of the points. the + and - button of this control would increase by a factor of 1 pixel to the radius of the control points 2- to add a control (like zoom) that would allow me to increase or decrease the opacity of the lines. this would work exactly like the opacity control for the canvas image 3- to have the zoom and scrolling of the canvas image keep the points where they're supposed to be. For example, if I zoom in twice the size, the points should also zoom in to twice the size but without increasing the radius of the point controls or the thickness of the lines. It would be a redraw that would use new coordinates that are "zoomed" in. This would change the actual coordinates the points, only a the user's "view" of the points. Additionally, scrolling up or down or side to side would scroll the points as well instead of just the canvas image. Again, this scrolling does not affect the real (meaning the values exported) position values of the points, just the user's "view" of it. Budget is 55$