Introduction to Computer Science with Scratch and App Inventor

Moving Your Sprite
Everyone should have a sprite now. The next step is to write a script that will make our sprite move on
its own! We write scripts by dragging blocks from the block palate onto the scripts area. Since we want
our sprite to move, we will use blocks from the motion set (the blue blocks). We’ll first make our sprite
move forward 10 steps, so we’ll drag a block that says move 10 steps onto the scripts area.
If you click on the block, you can see the sprite move on the stage.
Click on
block here
Sprite will
move here
If you want the sprite to move further, you can make the number of steps bigger. Try making the
number 100 and see what happens.
To make the sprite move backwards, you can make the number of steps negative by putting a minus
sign in front of the number. Try making the number of steps -100 and see what happens.
The size of the steps that a sprite makes is based on a coordinate system. Every spot on the stage can
be identified by an x, y coordinate. The x coordinates go from left to write and have values -240 to 240.
The y coordinates go from bottom to top and have values from -180 to 180.
mbrace Game Development Workbook Page 6