Change X by () `change x by ()` 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?> then
change x by (-5)
end
if <key (right arrow v) pressed?> then
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
erase all //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)
```