How do i make a javascript of a filled rectangle move across the middle of a custom sized canvas?

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How do i create a small java program of a filled rectangle box moving across a custom sized canvas with a user input of the box size in pixel, pixel speed, and number of times it crosses the middle of the canvas? And the top would have a counter of how many crosses are left? I am new to java and i want to create a simple program to start from

asked 30 secs ago

Nong Shim

9

How do i make a javascript of a filled rectangle move across the middle of a custom sized canvas?