Misconception: Students get confused reconciling the coordinate system with the point Scratch uses as the center for Sprites.

Like 
  • The picture below is of the costume editing stage in Scratch with the top right button “Set Costume Center” Pressed.
    • The part of the sprite costume that touches the intersection of the lines shown is the “center” of the sprite. That means when you send a sprite to 0,0 on the coordinate plane, that part of the sprite will touch 0,0.
      • You can change the center point of the costume in with the “Set Costume Center” to wherever you like.
        • The costume editing stage in Scratch with the cat sprite centered at the origin.
  • Consider an example when using a sprite that is a ball:
    • If you put the center spot in the middle of the ball, when we have it move to x=0 y=0 the ball will be at the exact center of the coordinate system.
    • If you put the center spot on the top of the ball, when we have it move to x=0 y=0 the ball will be below the axis.
External Source: 

Interview with Glenda Guerrero

Other Tips By: