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10.4: Coordinate Sequences

  • Page ID
    15477
  • \( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}} } \)

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    The rectangle method takes a sequence of coordinates that specify opposite corners of the rectangle. This example draws a blue rectangle with the lower left corner at the origin and the upper right corner at (200,100):

    canvas.rectangle([[0, 0], [200, 100]], 
                     fill='blue', outline='orange', width=10)
    

    This way of specifying corners is called a bounding box because the two points bound the rectangle.

    oval takes a bounding box and draws an oval within the specified rectangle:

    canvas.oval([[0, 0], [200, 100]], outline='orange', width=10)
    

    line takes a sequence of coordinates and draws a line that connects the points. This example draws two legs of a triangle:

    canvas.line([[0, 100], [100, 200], [200, 100]], width=10)
    

    polygon takes the same arguments, but it draws the last leg of the polygon (if necessary) and fills it in:

    canvas.polygon([[0, 100], [100, 200], [200, 100]],
                   fill='red', outline='orange', width=10)

    This page titled 10.4: Coordinate Sequences is shared under a CC BY-NC-SA 3.0 license and was authored, remixed, and/or curated by Allen B. Downey (Green Tea Press) .

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