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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 math import *

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

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#                               Common constants

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

    32

    33

"""

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Definition of constants for dimensions of graphic elements

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"""

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    37

# 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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    46

# 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_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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    54

# 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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    63

# 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] = range(4)

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

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    71

# 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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    74

# 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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    77

# 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, MODE_WIRE,

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 MODE_COIL, MODE_CONTACT, MODE_POWERRAIL, MODE_INITIALSTEP, MODE_STEP, MODE_TRANSITION,

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 MODE_DIVERGENCE, MODE_JUMP, MODE_ACTION] = range(15)

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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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CURSORS = None

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def ResetCursors():

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    global CURSORS

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    if CURSORS == None:

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        CURSORS = [wx.NullCursor, 

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                   wx.StockCursor(wx.CURSOR_HAND),

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                   wx.StockCursor(wx.CURSOR_SIZENWSE),

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                   wx.StockCursor(wx.CURSOR_SIZENESW),

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                   wx.StockCursor(wx.CURSOR_SIZEWE),

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                   wx.StockCursor(wx.CURSOR_SIZENS)]

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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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"""

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Basic vector operations for calculate wire points

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"""

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   115

# 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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   119

# 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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   126

# 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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   130

# 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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"""

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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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#                               Viewer Rubberband

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

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   169

"""

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Class that implements a rubberband

   171

"""

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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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    # 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()

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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.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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#-------------------------------------------------------------------------------

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#                           Graphic element base class

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

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"""

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Class that implements a generic graphic element

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"""

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class Graphic_Element:

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    # Create a new graphic element

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

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        self.Parent = parent

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        self.Id = id

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        self.oldPos = None

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        self.Handle = False

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        self.Dragging = False

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        self.Selected = False

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

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

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

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        self.CurrentCursor = 0

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        ResetCursors()

   293

   294

    # Make a clone of this element

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    def Clone(self):

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        return Graphic_Element(self.Parent, self.Id)

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   298

    # Changes the block position

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    def SetPosition(self, x, y):

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        self.Pos.x = x

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        self.Pos.y = y

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        self.RefreshConnected()

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        self.RefreshBoundingBox()

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   305

    # Returns the block position

   306

    def GetPosition(self):

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

   308

   309

    # Changes the element size

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    def SetSize(self, width, height):

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        self.Size.SetWidth(width)

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        self.Size.SetHeight(height)

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        self.RefreshConnectors()

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        self.RefreshBoundingBox()

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    # Returns the element size

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    def GetSize(self):

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        return self.Size.GetWidth(), self.Size.GetHeight()

   319

   320

    # Refresh the element Bounding Box

   321

    def RefreshBoundingBox(self):

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        self.BoundingBox = wx.Rect(self.Pos.x, self.Pos.y, self.Size[0], self.Size[1])

   323

   324

    # Refresh the element connectors position

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    def RefreshConnectors(self):

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        pass

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   328

    # Refresh the position of wires connected to element inputs and outputs

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    def RefreshConnected(self):

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        pass

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   332

    # Change the parent

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    def SetParent(self, parent):

   334

        self.Parent = parent

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   336

    # Override this method for defining the method to call for deleting this element

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    def Delete(self):

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        pass

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   340

    # Returns the Id

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    def GetId(self):

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        return self.Id

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   344

    # Returns if the point given is in the bounding box

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    def HitTest(self, pt):

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        rect = self.BoundingBox

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        return rect.InsideXY(pt.x, pt.y)

   348

   349

    # Returns if the point given is in the bounding box

   350

    def IsInSelection(self, rect):

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        return rect.InsideXY(self.BoundingBox.x, self.BoundingBox.y) and rect.InsideXY(self.BoundingBox.x + self.BoundingBox.width, self.BoundingBox.y + self.BoundingBox.height)

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   353

    # Override this method for refreshing the bounding box

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    def RefreshBoundingBox(self):

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        pass

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   357

    # Returns the bounding box

   358

    def GetBoundingBox(self):

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        return self.BoundingBox

   360

   361

    # Change the variable that indicates if this element is selected

   362

    def SetSelected(self, selected):

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        self.Selected = selected

   364

   365

    # Test if the point is on a handle of this element

   366

    def TestHandle(self, pt):

   367

        extern_rect = wx.Rect(self.BoundingBox.x - HANDLE_SIZE - 2, self.BoundingBox.y - HANDLE_SIZE - 2, 

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            self.BoundingBox.width + 2 * HANDLE_SIZE + 4, self.BoundingBox.height + 2 * HANDLE_SIZE + 4)

   369

        intern_rect = wx.Rect(self.BoundingBox.x - 2, self.BoundingBox.y - 2, 

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            self.BoundingBox.width + 4, self.BoundingBox.height + 4)

   371

        # Verify that this element is selected

   372

        if self.Selected and extern_rect.InsideXY(pt.x, pt.y) and not intern_rect.InsideXY(pt.x, pt.y):

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            # Find if point is on a handle horizontally

   374

            if self.BoundingBox.x - HANDLE_SIZE - 2 <= pt.x < self.BoundingBox.x - 2:

   375

                handle_x = 1

   376

            elif self.BoundingBox.x + (self.BoundingBox.width - HANDLE_SIZE) / 2 <= pt.x < self.BoundingBox.x + (self.BoundingBox.width + HANDLE_SIZE) / 2:

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                handle_x = 2

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            elif self.BoundingBox.x + self.BoundingBox.width + 2 <= pt.x < self.BoundingBox.x + self.BoundingBox.width + HANDLE_SIZE + 2:

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                handle_x = 3

   380

            else:

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                handle_x = 0

   382

            # Find if point is on a handle vertically

   383

            if self.BoundingBox.y - HANDLE_SIZE - 2 <= pt.y < self.BoundingBox.y - 2:

   384

                handle_y = 1

   385

            elif self.BoundingBox.y + (self.BoundingBox.height - HANDLE_SIZE) / 2 <= pt.y < self.BoundingBox.y + (self.BoundingBox.height + HANDLE_SIZE) / 2:

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                handle_y = 2

   387

            elif self.BoundingBox.y + self.BoundingBox.height - 2 <= pt.y < self.BoundingBox.y + self.BoundingBox.height + HANDLE_SIZE + 2:

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                handle_y = 3

   389

            else:

   390

                handle_y = 0

   391

            # Verify that the result is valid

   392

            if (handle_x, handle_y) in VALID_HANDLES:

   393

                return handle_x, handle_y

   394

        return 0, 0

   395

   396

    # Method called when a LeftDown event have been generated

   397

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

   398

        pos = event.GetLogicalPosition(dc)

   399

        # Test if an handle have been clicked

   400

        handle = self.TestHandle(pos)

   401

        # Find which type of handle have been clicked,

   402

        # Save a resize event and change the cursor

   403

        cursor = HANDLE_CURSORS.get(handle, 1)

   404

        if cursor != self.CurrentCursor:

   405

            self.Parent.SetCursor(CURSORS[cursor])

   406

            self.CurrentCursor = cursor

   407

        if cursor > 1:

   408

            self.Handle = (HANDLE_RESIZE, handle)

   409

        else:

   410

            self.Handle = (HANDLE_MOVE, None)

   411

            self.SetSelected(False)

   412

        # Initializes the last position

   413

        self.oldPos = GetScaledEventPosition(event, dc, scaling)

   414

   415

    # Method called when a LeftUp event have been generated

   416

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

   417

        # If a dragging have been initiated

   418

        if self.Dragging and self.oldPos:

   419

            # Calculate the movement of cursor and refreshes the element state

   420

            pos = GetScaledEventPosition(event, dc, scaling)

   421

            movex = pos.x - self.oldPos.x

   422

            movey = pos.y - self.oldPos.y

   423

            self.ProcessDragging(movex, movey)

   424

            self.RefreshModel()

   425

            self.Parent.RefreshBuffer()

   426

        if self.CurrentCursor != 0:

   427

            self.Parent.SetCursor(CURSORS[0])

   428

            self.CurrentCursor = 0

   429

        self.SetSelected(True)

   430

        self.oldPos = None

   431

   432

    # Method called when a RightUp event have been generated

   433

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

   434

        self.SetSelected(True)

   435

        self.oldPos = None

   436

   437

    # Method called when a LeftDClick event have been generated

   438

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

   439

        pass

   440

   441

    # Method called when a Motion event have been generated

   442

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

   443

        # If the cursor is dragging and the element have been clicked

   444

        if event.Dragging() and self.oldPos:

   445

            # Calculate the movement of cursor

   446

            pos = GetScaledEventPosition(event, dc, scaling)

   447

            movex = pos.x - self.oldPos.x

   448

            movey = pos.y - self.oldPos.y

   449

            # If movement is greater than MIN_MOVE then a dragging is initiated

   450

            if not self.Dragging and (abs(movex) > MIN_MOVE or abs(movey) > MIN_MOVE):

   451

                self.Dragging = True

   452

            # If a dragging have been initiated, refreshes the element state

   453

            if self.Dragging:

   454

                self.oldPos = pos

   455

                self.ProcessDragging(movex, movey)

   456

            return True

   457

        # If cursor just pass over the element, changes the cursor if it is on a handle

   458

        else:

   459

            pos = event.GetLogicalPosition(dc)

   460

            handle = self.TestHandle(pos)

   461

            # Find which type of handle have been clicked,

   462

            # Save a resize event and change the cursor

   463

            cursor = HANDLE_CURSORS.get(handle, 0)

   464

            if cursor != self.CurrentCursor:

   465

                self.Parent.SetCursor(CURSORS[cursor])

   466

                self.CurrentCursor = cursor

   467

            return False

   468

   469

    # Moves the element

   470

    def Move(self, dx, dy, exclude = []):

   471

        self.Pos.x += dx

   472

        self.Pos.y += dy

   473

        self.RefreshConnected(exclude)

   474

        self.RefreshBoundingBox()

   475

   476

    # Resizes the element from position and size given

   477

    def Resize(self, x, y, width, height):

   478

        self.Move(x, y)

   479

        self.SetSize(width, height)

   480

   481

    # Refreshes the element state according to move defined and handle selected

   482

    def ProcessDragging(self, movex, movey):

   483

        handle_type, handle = self.Handle

   484

        # If it is a resize handle, calculate the values from resizing

   485

        if handle_type == HANDLE_RESIZE:

   486

            x, y = 0, 0

   487

            width, height = self.GetSize()

   488

            if handle[0] == 1:

   489

                x = movex

   490

                width -= movex

   491

            elif handle[0] == 3:

   492

                width += movex

   493

            if handle[1] == 1:

   494

                y = movey

   495

                height -= movey

   496

            elif handle[1] == 3:

   497

                height += movey

   498

            # Verify that new size is not lesser than minimum

   499

            min_width, min_height = self.GetMinSize()

   500

            if width >= min_width and height >= min_height:

   501

                self.Resize(x, y, width, height)

   502

        # If it is a move handle, Move this element

   503

        elif handle_type == HANDLE_MOVE:

   504

            self.Move(movex, movey)

   505

   506

    # Override this method for defining the method to call for refreshing the model of this element

   507

    def RefreshModel(self, move=True):

   508

        pass

   509

   510

    # Draws the handles of this element if it is selected

   511

    def Draw(self, dc):

   512

        if self.Selected:

   513

            dc.SetPen(wx.BLACK_PEN)

   514