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#!/usr/bin/env python

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# -*- coding: utf-8 -*-

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#This file is part of PLCOpenEditor, a library implementing an IEC 61131-3 editor

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#based on the plcopen standard. 

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#

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#Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD

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#

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#See COPYING file for copyrights details.

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#

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#This library is free software; you can redistribute it and/or

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#modify it under the terms of the GNU General Public

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#License as published by the Free Software Foundation; either

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#version 2.1 of the License, or (at your option) any later version.

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#

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#This library is distributed in the hope that it will be useful,

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#but WITHOUT ANY WARRANTY; without even the implied warranty of

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#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

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#General Public License for more details.

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#

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#You should have received a copy of the GNU General Public

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#License along with this library; if not, write to the Free Software

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#Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

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import wx

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from time import time as gettime

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from math import *

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from types import *

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#-------------------------------------------------------------------------------

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#                               Common constants

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#-------------------------------------------------------------------------------

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"""

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Definition of constants for dimensions of graphic elements

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"""

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# FBD and SFC constants

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MIN_MOVE = 5                            # Minimum move before starting a element dragging

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CONNECTOR_SIZE = 8                      # Size of connectors

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BLOCK_LINE_SIZE = 20                    # Minimum size of each line in a block

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HANDLE_SIZE = 6                         # Size of the squares for handles

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ANCHOR_DISTANCE = 5                     # Distance where wire is automativally attached to a connector

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POINT_RADIUS = 2                        # Radius of the point of wire ends

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MIN_SEGMENT_SIZE = 2                    # Minimum size of the endling segments of a wire

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# LD constants

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LD_LINE_SIZE = 40                       # Distance between two lines in a ladder rung

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LD_ELEMENT_SIZE = (21, 15)              # Size (width, height) of a ladder element (contact or coil)

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LD_WIRE_SIZE = 30                       # Size of a wire between two contact

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LD_WIRECOIL_SIZE = 70                   # Size of a wire between a coil and a contact

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LD_POWERRAIL_WIDTH = 3                  # Width of a Powerrail

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LD_OFFSET = (10, 10)                    # Distance (x, y) between each comment and rung of the ladder

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LD_COMMENT_DEFAULTSIZE = (600, 40)      # Size (width, height) of a comment box

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# SFC constants

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SFC_STEP_DEFAULT_SIZE = (40, 30)        # Default size of a SFC step

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SFC_TRANSITION_SIZE = (20, 2)           # Size of a SFC transition

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SFC_DEFAULT_SEQUENCE_INTERVAL = 40      # Default size of the interval between two divergence branches

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SFC_SIMULTANEOUS_SEQUENCE_EXTRA = 20    # Size of extra lines for simultaneous divergence and convergence

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SFC_JUMP_SIZE = (12, 13)                # Size of a SFC jump to step

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SFC_WIRE_MIN_SIZE = 25                  # Size of a wire between two elements

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SFC_ACTION_MIN_SIZE = (100, 30)         # Minimum size of an action block line

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# Type definition constants for graphic elements

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[INPUT, OUTPUT, INOUT] = range(3)

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[CONNECTOR, CONTINUATION] = range(2)

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[LEFTRAIL, RIGHTRAIL] = range(2)

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[CONTACT_NORMAL, CONTACT_REVERSE, CONTACT_RISING, CONTACT_FALLING] = range(4)

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[COIL_NORMAL, COIL_REVERSE, COIL_SET, COIL_RESET, COIL_RISING, COIL_FALLING] = range(6)

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[SELECTION_DIVERGENCE, SELECTION_CONVERGENCE, SIMULTANEOUS_DIVERGENCE, SIMULTANEOUS_CONVERGENCE] = range(4)

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# Constants for defining the type of dragging that has been selected

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[HANDLE_MOVE, HANDLE_RESIZE, HANDLE_POINT, HANDLE_SEGMENT, HANDLE_CONNECTOR] = range(5)

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# List of value for resize handle that are valid

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VALID_HANDLES = [(1,1), (1,2), (1,3), (2,3), (3,3), (3,2), (3,1), (2,1)]

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# Contants for defining the direction of a connector

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[EAST, NORTH, WEST, SOUTH] = [(1,0), (0,-1), (-1,0), (0,1)]

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# Contants for defining which mode is selected for each view 

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[MODE_SELECTION, MODE_BLOCK, MODE_VARIABLE, MODE_CONNECTION, MODE_COMMENT, 

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 MODE_COIL, MODE_CONTACT, MODE_POWERRAIL, MODE_INITIALSTEP, MODE_STEP, 

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 MODE_TRANSITION, MODE_DIVERGENCE, MODE_JUMP, MODE_ACTION] = range(14)

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# Contants for defining alignment types for graphic group 

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[ALIGN_LEFT, ALIGN_CENTER, ALIGN_RIGHT, ALIGN_TOP, ALIGN_MIDDLE, ALIGN_BOTTOM] = range(6)

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# Contants for defining which drawing mode is selected for app

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[FREEDRAWING_MODE, DRIVENDRAWING_MODE] = [1, 2]

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# Color for Highlighting

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HIGHLIGHTCOLOR = wx.CYAN

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HANDLE_CURSORS = {

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    (1, 1) : 2,

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    (3, 3) : 2,

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    (1, 3) : 3,

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    (3, 1) : 3,

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    (1, 2) : 4,

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    (3, 2) : 4,

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    (2, 1) : 5,

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    (2, 3) : 5

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}

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def round_scaling(x, n, constraint=0):

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    fraction = float(x) / float(n)

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    if constraint == - 1:

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        xround = int(fraction)

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    else:

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        xround = round(fraction)

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        if constraint == 1 and int(fraction) == xround:

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            xround += 1

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    return xround * n

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"""

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Basic vector operations for calculate wire points

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"""

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# Create a vector from two points and define if vector must be normal

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def vector(p1, p2, normal = True):

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    vector = (p2.x - p1.x, p2.y - p1.y)

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    if normal:

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        return normalize(vector)

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    return vector

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# Calculate the norm of a given vector

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def norm(v):

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    return sqrt(v[0] * v[0] + v[1] * v[1])

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# Normalize a given vector

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def normalize(v):

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    v_norm = norm(v)

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    # Verifie if it is not a null vector

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    if v_norm > 0:

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        return (v[0] / v_norm, v[1] / v_norm)

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    else:

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        return v

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# Calculate the scalar product of two vectors

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def is_null_vector(v):

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    return v == (0, 0)

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# Calculate the scalar product of two vectors

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def add_vectors(v1, v2):

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    return (v1[0] + v2[0], v1[1] + v2[1])

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# Calculate the scalar product of two vectors

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def product(v1, v2):

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    return v1[0] * v2[0] + v1[1] * v2[1]

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"""

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Function that calculates the nearest point of the grid defined by scaling for the given point

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"""

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def GetScaledEventPosition(event, dc, scaling):

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    pos = event.GetLogicalPosition(dc)

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    if scaling:

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        pos.x = round(float(pos.x) / float(scaling[0])) * scaling[0]

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        pos.y = round(float(pos.y) / float(scaling[1])) * scaling[1]

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    return pos

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"""

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Function that choose a direction during the wire points generation

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"""

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def DirectionChoice(v_base, v_target, dir_target):

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    dir_product = product(v_base, v_target)

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    if dir_product < 0:

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        return (-v_base[0], -v_base[1])

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    elif dir_product == 0 and product(v_base, dir_target) != 0:

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        return dir_target

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    return v_base

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#-------------------------------------------------------------------------------

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#                            Debug Data Consumer Class

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#-------------------------------------------------------------------------------

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class DebugDataConsumer:

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    def __init__(self):

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        self.LastValue = None

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        self.Value = None

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        self.Inhibited = False

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    def Inhibit(self, inhibit):

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        self.Inhibited = inhibit

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        if not inhibit and self.LastValue is not None:

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            self.SetValue(self.LastValue)

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            self.LastValue = None

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    def NewValue(self, tick, value):

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        if self.Inhibited:

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            self.LastValue = value

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        else:

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            self.SetValue(value)

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    def SetValue(self, value):

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        self.Value = value

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#-------------------------------------------------------------------------------

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#                               Debug Viewer Class

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#-------------------------------------------------------------------------------

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REFRESH_PERIOD = 0.1

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class DebugViewer:

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    def __init__(self, producer, debug, register_tick=True):

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        self.DataProducer = producer

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        self.Debug = debug

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        self.Inhibited = False

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        self.DataConsumers = {}

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        self.LastRefreshTime = gettime()

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        self.RefreshTimer = wx.Timer(self, -1)

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        self.Bind(wx.EVT_TIMER, self.OnRefreshTimer, self.RefreshTimer)

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        if register_tick and debug:

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            self.DataProducer.SubscribeDebugIECVariable("__tick__", self)

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    def __del__(self):

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        if self.Debug:

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            self.DataProducer.UnsubscribeDebugIECVariable("__tick__", self)

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        self.DeleteDataConsumers()

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        self.RefreshTimer.Stop()

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    def Inhibit(self, inhibit):

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        self.Inhibited = inhibit

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        for consumer, iec_path in self.DataConsumers.iteritems():

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            consumer.Inhibit(inhibit)

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    def AddDataConsumer(self, iec_path, consumer):

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        result = self.DataProducer.SubscribeDebugIECVariable(iec_path, consumer) is not None

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        if result is not None and consumer != self:

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            self.DataConsumers[consumer] = iec_path

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        return result

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    def RemoveDataConsumer(self, consumer):

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        iec_path = self.DataConsumers.pop(consumer, None)

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        if iec_path is not None:

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            self.DataProducer.UnsubscribeDebugIECVariable(iec_path, consumer)

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    def DeleteDataConsumers(self):

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        for consumer, iec_path in self.DataConsumers.iteritems():

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            self.DataProducer.UnsubscribeDebugIECVariable(iec_path, consumer)

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        self.DataConsumers = {}

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    def OnRefreshTimer(self, event):

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        self.RefreshNewData()

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        event.Skip()

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    def NewDataAvailable(self):

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        self.RefreshTimer.Stop()

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        if not self.Inhibited:

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            current_time = gettime()

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            if current_time - self.LastRefreshTime > REFRESH_PERIOD:

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                self.LastRefreshTime = current_time

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                self.Inhibit(True)

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                wx.CallAfter(self.RefreshViewOnNewData)

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    def RefreshViewOnNewData(self):

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        if self:

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            self.RefreshNewData()

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            self.RefreshTimer.Start(int(REFRESH_PERIOD * 1000), oneShot=True)

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    def RefreshNewData(self):

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        self.Inhibit(False)

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#-------------------------------------------------------------------------------

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#                               Viewer Rubberband

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#-------------------------------------------------------------------------------

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"""

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Class that implements a rubberband

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"""

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class RubberBand:

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    # Create a rubberband by indicated on which window it must be drawn

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    def __init__(self, drawingSurface):

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        self.drawingSurface = drawingSurface

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        self.Reset()

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    # Method that initializes the internal attributes of the rubberband

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    def Reset(self):

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        self.startPoint = None

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        self.currentBox = None

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        self.lastBox = None

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    # Method that return if a box is currently edited

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    def IsShown(self):

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        return self.currentBox != None

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    # Method that returns the currently edited box

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    def GetCurrentExtent(self):

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        return self.currentBox

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    # Method called when a new box starts to be edited

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    def OnLeftDown(self, event, dc, scaling):

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        pos = GetScaledEventPosition(event, dc, scaling)

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        # Save the point for calculate the box position and size

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        self.startPoint = pos

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        self.currentBox = wx.Rect(pos.x, pos.y, 0, 0)

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        self.drawingSurface.SetCursor(wx.StockCursor(wx.CURSOR_CROSS))

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        self.Redraw()

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    # Method called when dragging with a box edited

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    def OnMotion(self, event, dc, scaling):

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        pos = GetScaledEventPosition(event, dc, scaling)

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        # Save the last position and size of the box for erasing it

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        self.lastBox = wx.Rect(self.currentBox.x, self.currentBox.y, self.currentBox.width,

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            self.currentBox.height)

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        # Calculate new position and size of the box 

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        if pos.x >= self.startPoint.x:

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            self.currentBox.x = self.startPoint.x

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            self.currentBox.width = pos.x - self.startPoint.x + 1

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        else:

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            self.currentBox.x = pos.x

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            self.currentBox.width = self.startPoint.x - pos.x + 1

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        if pos.y >= self.startPoint.y:

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            self.currentBox.y = self.startPoint.y

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            self.currentBox.height = pos.y - self.startPoint.y + 1

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        else:

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            self.currentBox.y = pos.y

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            self.currentBox.height = self.startPoint.y - pos.y + 1

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        self.Redraw()

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    # Method called when dragging is stopped

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    def OnLeftUp(self, event, dc, scaling):

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        self.drawingSurface.SetCursor(wx.NullCursor)

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        self.lastBox = self.currentBox

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        self.currentBox = None

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        self.Redraw()

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    # Method that erase the last box and draw the new box

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    def Redraw(self, dc = None):

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        if not dc:

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            dc = self.drawingSurface.GetLogicalDC()

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        dc.SetPen(wx.Pen(wx.WHITE, 1, wx.DOT))

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        dc.SetBrush(wx.TRANSPARENT_BRUSH)

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        dc.SetLogicalFunction(wx.XOR)

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        if self.lastBox:

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            # Erase last box

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            dc.DrawRectangle(self.lastBox.x, self.lastBox.y, self.lastBox.width,

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                self.lastBox.height)

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        if self.currentBox:

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            # Draw current box

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            dc.DrawRectangle(self.currentBox.x, self.currentBox.y, self.currentBox.width,

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                self.currentBox.height)

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    # Erase last box

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    def Erase(self, dc = None):

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        if not dc:

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            dc = self.drawingSurface.GetLogicalDC()

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        dc.SetPen(wx.Pen(wx.WHITE, 1, wx.DOT))

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        dc.SetBrush(wx.TRANSPARENT_BRUSH)

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        dc.SetLogicalFunction(wx.XOR)

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        if self.lastBox:

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            dc.DrawRectangle(self.lastBox.x, self.lastBox.y, self.lastBox.width,

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                self.lastBox.height)

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   369

    # Draw current box

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    def Draw(self, dc = None):

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        if not dc:

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            dc = self.drawingSurface.GetLogicalDC()

   373

        dc.SetPen(wx.Pen(wx.WHITE, 1, wx.DOT))

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        dc.SetBrush(wx.TRANSPARENT_BRUSH)

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        dc.SetLogicalFunction(wx.XOR)

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        if self.currentBox:

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            # Draw current box

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            dc.DrawRectangle(self.currentBox.x, self.currentBox.y, self.currentBox.width,

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                self.currentBox.height)

   380

   381

#-------------------------------------------------------------------------------

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#                               Viewer ToolTip

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#-------------------------------------------------------------------------------

   384

   385

"""

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Class that implements a custom tool tip

   387

"""

   388

   389

class ToolTip(wx.PopupWindow):

   390

   391

    # Create a rubberband by indicated on which window it must be drawn

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    def __init__(self, parent, tip):

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        wx.PopupWindow.__init__(self, parent)

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        self.SetBackgroundStyle(wx.BG_STYLE_CUSTOM)

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        self.SetTip(tip)

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        self.Bind(wx.EVT_PAINT, self.OnPaint)

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   399

    def SetTip(self, tip):

   400

        self.Tip = tip

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        wx.CallAfter(self.RefreshTip)

   402

   403

    def RefreshTip(self):

   404

        if self:

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            dc = wx.ClientDC(self)

   406

            w, h = dc.GetTextExtent(self.Tip)

   407

            self.SetSize(wx.Size(w + 4, h + 4))

   408

            self.Refresh()

   409

   410

    def OnPaint(self, event):

   411

        dc = wx.AutoBufferedPaintDC(self)

   412

        dc.Clear()

   413

        dc.SetPen(wx.BLACK_PEN)

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        dc.SetBrush(wx.Brush(wx.Colour(255, 238, 170)))

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        dc.BeginDrawing()

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        w, h = dc.GetTextExtent(self.Tip)

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        dc.DrawRectangle(0, 0, w + 4, h + 4)

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        dc.DrawText(self.Tip, 2, 2)

   419

        dc.EndDrawing()

   420

        event.Skip()

   421

   422

#-------------------------------------------------------------------------------

   423

#                    Helper for highlighting error in drawn text

   424

#-------------------------------------------------------------------------------

   425

   426

def HighlightErrorZone(dc, x, y, width, height):

   427

    dc.SetPen(wx.TRANSPARENT_PEN)

   428

    dc.SetLogicalFunction(wx.AND)

   429

    dc.SetBrush(wx.Brush(wx.Colour(0,255,0)))

   430

    dc.DrawRectangle(x, y, width, height)

   431

    dc.SetLogicalFunction(wx.XOR)

   432

    dc.SetBrush(wx.Brush(wx.Colour(255,0,0)))

   433

    dc.DrawRectangle(x, y, width, height)

   434

    dc.SetLogicalFunction(wx.COPY)

   435

   436

#-------------------------------------------------------------------------------

   437

#                           Graphic element base class

   438

#-------------------------------------------------------------------------------

   439

   440

"""

   441

Class that implements a generic graphic element

   442

"""

   443

   444

class Graphic_Element:

   445

   446

    # Create a new graphic element

   447

    def __init__(self, parent, id = None):

   448

        self.Parent = parent

   449

        self.Id = id

   450

        self.oldPos = None

   451

        self.StartPos = None

   452

        self.CurrentDrag = None

   453

        self.Handle = (None,None)

   454

        self.Dragging = False

   455

        self.Selected = False

   456

        self.Highlighted = False

   457

        self.Pos = wx.Point(0, 0)

   458

        self.Size = wx.Size(0, 0)

   459

        self.BoundingBox = wx.Rect(0, 0, 0, 0)

   460

        self.Visible = False

   461

   462

    def GetDefinition(self):

   463

        return [self.Id], []

   464

   465

    def TestVisible(self, screen):

   466

        self.Visible = self.GetRedrawRect().Intersects(screen)

   467

   468

    def IsVisible(self):

   469

        return self.Visible

   470

   471

    def SpreadCurrent(self):

   472

        pass

   473

   474

    def GetConnectorTranslation(self, element):

   475

        return {}

   476

   477

    def IsOfType(self, type, reference):

   478

        return self.Parent.IsOfType(type, reference)

   479

   480

    def IsEndType(self, type):

   481

        return self.Parent.IsEndType(type)

   482

   483

    def GetDragging(self):

   484

        return self.Dragging

   485

   486

    # Make a clone of this element

   487

    def Clone(self, parent):

   488

        return Graphic_Element(parent, self.Id)

   489

   490

    # Changes the block position

   491

    def SetPosition(self, x, y):

   492

        self.Pos.x = x

   493

        self.Pos.y = y

   494

        self.RefreshConnected()

   495

        self.RefreshBoundingBox()

   496

   497

    # Returns the block position

   498

    def GetPosition(self):

   499

        return self.Pos.x, self.Pos.y

   500

   501

    # Changes the element size

   502

    def SetSize(self, width, height):

   503

        self.Size.SetWidth(width)