| GZ_Box | Function (ROM Call 0x22B)

gdraw.h

void GZ_Box (void);

This function performs the Zoom Box command.

This is the equivalent of the Zoom Box command. After a keypress, it will display the graph screen. If there is none (i.e. no function graphed), and there aren't any graphs selected, then you will be presented with a blank screen. If there is a function (or more) selected, then it will present you with a "dummy axis" (a smaller one).

Uses: GZ_Center, EV_defaultHandler, gr_active, ST_helpMsg, XR_stringPtr, GT_CursorKey, GT_DspFreeTraceCoords, GT_DspMsg, GT_FreeTrace, GT_IncXY, GT_Regraph, GT_SetGraphRange, GT_WinBound, GT_WinCursor, WinDupStat, WinGetCursor, WinRect