lsst.afw.display.ds9.Buffer Class Reference

Inheritance diagram for lsst.afw.display.ds9.Buffer:

Public Member Functions
def	__init__
def	set
def	pushSize
def	popSize
def	flush

Private Member Functions
def	_getSize

Private Attributes
	_commands
	_lenCommands
	_bufsize

Detailed Description

Control buffering the sending of commands to ds9;
annoying but necessary for anything resembling performance

The usual usage pattern (from a module importing this file, ds9.py) is probably:

   with ds9.Buffering():
       # bunches of ds9.{dot,line} commands
       ds9.flush()
       # bunches more ds9.{dot,line} commands

or (if you don't like "with")
   ds9.buffer()
   # bunches of ds9.{dot,line} commands
   ds9.flush()
   # bunches more ds9.{dot,line} commands
   ds9.buffer(False)

or (the old idiom):
   
   ds9.cmdBuffer.pushSize()
   # bunches of ds9.{dot,line} commands
   ds9.cmdBuffer.flush()
   # bunches more ds9.{dot,line} commands
   ds9.cmdBuffer.popSize()

Definition at line 235 of file ds9.py.

Constructor & Destructor Documentation

def lsst.afw.display.ds9.Buffer.__init__	(		self,
			size = 0
	)

Create a command buffer, with a maximum depth of size

Definition at line 262 of file ds9.py.

        def __init__(self, size=0):
            """Create a command buffer, with a maximum depth of size"""
            self._commands = ""         # list of pending commands
            self._lenCommands = len(self._commands)
            self._bufsize = []          # stack of bufsizes

            self._bufsize.append(size)  # don't call self.size() as ds9Cmd isn't defined yet