(Redirected from Change X by ())

 Change X by () `change x by ()` Category Motion Type Stack

Change X by () is a Motion block and a stack block. This block changes the X Position of the sprite that uses it by the number specified. The X axis ranges from -240 to 240, but sprites can be moved further.

## 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 the following code:

```set x to ((x position) + (. . .::grey))
```
```go to x: ((x position) + (. . .::grey)) y: (y position)
```