elatch.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
#  Logic Circuits - elatch.py
#  Edge triggered latch. Try this at drawing depth 2-3-4-5.
#
#  Copyleft 2015 Chris Meyers <chris.meyers47@gmail.com> 2015.12.13
#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU General Public License as
#  published by the Free Software Foundation; either version 2 of
#  the License, or (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public
#  License along with this program; if not, write to the Free
#  Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
#  Boston, MA 02110-1301, USA.
#

__author__     = "Chris Meyers, Jeff Elkner and Kevin Cole"
__copyright__  = "Copyleft 2015, Chris Meyers (2015.12.13)"
__credits__    = ["Chris Meyers", "Jeff Elkner",
                  "Kevin Cole"]  # Authors and bug reporters
__license__    = "GPL"
__version__    = "2.0"
__maintainer__ = "Chris Meyers, Jeff Elkner, Kevin Cole"
__email__      = "kevin.cole@novawebcoop.org"
__status__     = "Development"  # "Prototype", "Development" or "Production"
__appname__    = "Logic Circuits"

import pygame as pg
from   gates     import Swt, Puls, Nand2, Inv
from   circuit   import Circuit
from   connector import Connector
from   dlatch    import DLatch
from   text      import textDraw


class ELatch (Circuit):
    def setupGraphics(s):
        dl1 = DLatch(s, "DL1", s.scale1((50, 0)))
        dl2 = DLatch(s, "DL2")
        dl2.align(dl2.D, dl1.Q, 20, 0)

        ei1 = Inv(s, "I3")
        ei1.align(ei1.A, dl1.C, 0, 60)

        td = (dl1.D.x(-30), dl1.D.y())  # terminal D
        tc = (dl1.C.x(-30), dl1.C.y())  # terminal C
        tq = (dl2.Q.x( 30), dl2.Q.y())  # terminal Q
        s.D = Connector(s, "D", td)
        s.C = Connector(s, "C", tc)
        s.Q = Connector(s, "Q", tq)
        s.D.addWire(dl1.D)
        s.C.addWire(dl1.C)
        s.C.addWire((s.C.x(), ei1.A.y()), ei1.A)
        ei1.B.addWire((dl2.C.x(-10), dl2.C.y()), dl2.C)
        dl1.Q.addWire(dl2.D)
        dl2.Q.addWire(s.Q)
        s.output = s.Q
        s.gates = (ei1, dl1, dl2)
        if s.encapsulated():
            s.D.pos, s.C.pos, s.Q.pos = s.scaleM((0, 8), (0, 32), (20, 20))


class TestELatch(Circuit):
    def setupGraphics(s):
        s.banner = "Edge Triggered Latch. Click S1 and P1"
        el1 = ELatch(s, "EL1", s.scale1((20, 20)))
        p1 = Puls(s, "P1")
        p1.align(p1.B, el1.C, -20, 0)
        s1 = Swt(s, "S1")
        s1.align(s1.B, el1.D, -20, 0)
        p1.B.addWire(el1.C)
        s1.B.addWire(el1.D)
        el1.output.addWire((el1.output.x(20), el1.output.y()))
        s.gates = (p1, s1, el1)

if __name__ == "__main__":
    import gameloop
    from   settings import CmdScale
    circuit = TestELatch(None, "TestLatch", (100, 100), scale=CmdScale)
    gameloop.gameloop(circuit)