Errata – Snap and Scratch books

RE: Screen coordinates

A point with coordinates X and Y is X units to the right of the y axis and Y units up from the x axis. It is possible for them to carry negative values. For Snap and Scratch, just keep these in mind:

  • When X increases, the sprite is moving to the right, and vice versa.
  • When Y increases, the sprite is moving upward, and vice versa.

 

Author: ycthk

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