Annotate Internal Coordinates

The Annotate facility maintains two sets of internal coordinates that are stored in the variable pairs (XLAST, YLAST) and (XLSTT, YLSTT). One set of variables (XLAST, YLAST) stores coordinate values that are generated by nontext functions and the other set (XLSTT, YLSTT) stores coordinates generated by text functions. These two variable pairs supply default values when the X or Y variable contains a missing value.

Both pairs are initially set to 0 and remain 0 until a function updates the values. You cannot assign explicit values to these variables, but you can manipulate their values with some of the Annotate functions.

XLAST, YLAST Variables

Track the last values specified for the X and Y variables when X and Y are used with nontext functions.

Details

The coordinate values that are stored in the (XLAST, YLAST) variables are automatically updated by these nontext functions: BAR, DRAW, MOVE, PIE, and POINT. These values are then available for use by other nontext functions that follow in the DATA step. (The DRAW2TXT graphics function uses XLAST and YLAST but does not update them.)

Because (XLAST, YLAST) are updated internally, you cannot specify values for them. However, their values can be manipulated by these programming functions:

• CNTL2TXT

• PIECNTR

• PIEXY

• POP

• PUSH

• SWAP

• TXT2CNTL

XLSTT, YLSTT Variables

Track the last position for the X and Y variables when X and Y are used with text-handling functions.

Details

The coordinate values stored in the (XLSTT, YLSTT) variables are automatically updated by the LABEL and SYMBOL text functions. These values are then available for use by other text functions that follow in the DATA step.

Because (XLSTT, YLSTT) are updated internally, you cannot specify values for them. However, their values can be manipulated by these programming functions:

• CNTL2TXT

• DRAW2TXT

• POP

• PUSH

• SWAP

• TXT2CNTL