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Check if a background layer is being scrolled. # Syntax ```sbsyntax scroll = BGCHK(layer) ``` |Input|Description|[#] |`layer`|Layer to check status of| |Output|Description|[#] |`scroll`|1 if layer is currently moving, 0 otherwise| Checks if `layer` is currently being scrolled by a previous `BGOFS` command. 1 indicates that the layer is currently animating, 0 indicates that there is no movement. # Examples ```sb 'Layer 0 is not moving yet '0 is printed PRINT BGCHK(0) 'Make layer 0 move for 30 frames BGOFS 0,30,30,30 '1 is printed PRINT BGCHK(0) 'Wait for movement to end WAIT 30 '0 is printed PRINT BGCHK(0) ``` # Notes All arguments are rounded down. For some reason, specifying an invalid layer causes an `Overflow` error instead of an `Out of range` error. Note that in v1 of Petit Computer, this command did not exist. # Errors |Action|Error|[#] |Zero arguments are passed|Syntax error| |Two or more arguments are passed|Missing operand| |A string is passed|Type Mismatch| |A value not 0 or 1 is passed for `layer`|Overflow| # See Also - sbs:page/docs-ptc-background[Background overview] - sbs:page/docs-ptc-bgofs{`BGOFS`}

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