From Test-Scratch-Wiki
| Change X by () | |
.png){kind=small}
| |
| Category | Motion |
| Type | Stack |
The Change X by () block is a Motion block and a Stack block. The block moves its sprite costume center's X position by the specified amount. The x axis ranges from -240 to 240.
Example Uses
- Often in games, the player controls a sprite and moves it around
— the Change X by () block (and the Change Y by () block) are very common in this event.
when gf clicked forever if <key [left arrow v] pressed?> change x by (-5) end if <key [right arrow v] pressed?> change x by (5)
- This block can also be used to move a sprite which creates a sine wave (see Trigonometry) along the x axis. An example script of this situation is:
when gf clicked go to x (-240) y (([sin v] of (-240)) * (100)) //240 is the leftmost position of the stage clear //clears a previously drawn wave, if it exists pen down //draws the first point of the wave repeat (480) //the width of the stage is 480 x coordinates pen up //so the movement to the next position is not interfered with an unintended, out-of-place line change x by (1) //the use of the block set y to (([sin v] of (x position)) * (100)) //the result is multiplied by "100" to expand the amplitude for visual preference pen down //creates the mark
Workaround
- Main article: List of Block Workarounds
This block can be replicated with either of the following codes:
set x to ((x position) + (change))
go to x: ((x position) + (change)) y: (y position)
