6.9. The canvas rectangle object

Each rectangle is specified as two points: (x0, y0) is the top left corner, and (x1, y1) is the bottom right corner.

Rectangles are drawn in two parts:

The outline lies outside the canvas on its top and left sides, but inside the canvas on its bottom and right side. The default appearance is a 1-pixel-wide black outline.
The fill is the area inside the outline. Its default appearance is transparent.

To create a rectangle object on canvas C:

    id = C.create_rectangle ( x0, y0, x1, y1, option, ... )

This constructor returns the object ID of the rectangle on that canvas. Options include:

`fill`	By default, the interior of a rectangle is empty, and you can get this behavior with `fill=""`. You can also set the option to a color; see Section 4.3, “Colors”.
`outline`	The color of the border. Default is `outline="black"`.
`stipple`	A bitmap indicating how the interior of the rectangle will be stippled. Default is `stipple=""`, which means a solid color. A typical value would be `stipple="gray25"`. Has no effect unless the `fill` has been set to some color. See Section 4.7, “Bitmaps”.
`tags`	The tags to be associated with the object, as a sequence of strings. See Section 6.1.4, “Canvas tags”.
`width`	Width of the border. Default is 1 pixel. Use `width=0` to make the border invisible. See Section 4.1, “Dimensions”.

Tkinter reference: a GUI for Python