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

    31

    32

"""

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Definition of constants for dimensions of graphic elements

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"""

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    36

# 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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    45

# 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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    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, 

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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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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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# 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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# 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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"""

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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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"""

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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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    # 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 = (None,None)

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        self.Dragging = False

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        self.Selected = False

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        self.Highlighted = 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()

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   321

    def GetDragging(self):

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        return self.Dragging

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    # Make a clone of this element

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    def Clone(self, parent):

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        return Graphic_Element(parent, self.Id)

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    # 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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   335

    # Returns the block position

   336

    def GetPosition(self):

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

   338

   339

    # Changes the element size

   340

    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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   346

    # Returns the element size

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    def GetSize(self):

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

   349

   350

    # Refresh the element Bounding Box

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    def RefreshBoundingBox(self):

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

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   354

    # Refresh the element connectors position

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    def RefreshConnectors(self):

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        pass

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    # 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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   362

    # Change the parent

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    def SetParent(self, parent):

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        self.Parent = parent

   365

   366

    # 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

   369

   370

    # Returns the Id

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    def GetId(self):

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        return self.Id

   373

   374

    # 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)

   378

   379

    # Returns if the point given is in the bounding box

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    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)

   382

   383

    # Override this method for refreshing the bounding box

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    def RefreshBoundingBox(self):

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        pass

   386

   387

    # Returns the bounding box

   388

    def GetBoundingBox(self):

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        return self.BoundingBox

   390

   391

    # Returns the RedrawRect

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    def GetRedrawRect(self, movex = 0, movey = 0):

   393

        rect = wx.Rect()

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        rect.x = self.BoundingBox.x - HANDLE_SIZE - 2 - abs(movex)

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        rect.y = self.BoundingBox.y - HANDLE_SIZE - 2 - abs(movey)

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        rect.width = self.BoundingBox.width + 2 * (HANDLE_SIZE + abs(movex)) + 4

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        rect.height = self.BoundingBox.height + 2 * (HANDLE_SIZE + abs(movey)) + 4

   398

        return rect

   399

   400

    def Refresh(self, rect = None):

   401

        if rect is not None:

   402

            self.Parent.RefreshRect(self.Parent.GetScrolledRect(rect), False)

   403

        else:

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            self.Parent.RefreshRect(self.Parent.GetScrolledRect(self.GetRedrawRect()), False)

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   406

    # Change the variable that indicates if this element is selected

   407

    def SetSelected(self, selected):

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        self.Selected = selected

   409

        self.Refresh()

   410

   411

    # Change the variable that indicates if this element is highlighted

   412

    def SetHighlighted(self, highlighted):

   413

        self.Highlighted = highlighted

   414

        self.Refresh()

   415

   416

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

   417

    def TestHandle(self, pt):

   418

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

   419

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

   420

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

   421

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

   422

        # Verify that this element is selected

   423

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

   424

            # Find if point is on a handle horizontally

   425

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

   426

                handle_x = 1

   427

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

   428

                handle_x = 2

   429

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

   430

                handle_x = 3

   431

            else:

   432

                handle_x = 0

   433

            # Find if point is on a handle vertically

   434

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

   435

                handle_y = 1

   436

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

   437

                handle_y = 2

   438

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

   439

                handle_y = 3

   440

            else:

   441

                handle_y = 0

   442

            # Verify that the result is valid

   443

            if (handle_x, handle_y) in VALID_HANDLES:

   444

                return handle_x, handle_y

   445

        return 0, 0

   446

   447

    # Method called when a LeftDown event have been generated

   448

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

   449

        pos = event.GetLogicalPosition(dc)

   450

        # Test if an handle have been clicked

   451

        handle = self.TestHandle(pos)

   452

        # Find which type of handle have been clicked,

   453

        # Save a resize event and change the cursor

   454

        cursor = HANDLE_CURSORS.get(handle, 1)

   455

        if cursor != self.CurrentCursor:

   456

            self.Parent.SetCursor(CURSORS[cursor])

   457

            self.CurrentCursor = cursor

   458

        if cursor > 1:

   459

            self.Handle = (HANDLE_RESIZE, handle)

   460

        else:

   461

            self.Handle = (HANDLE_MOVE, None)

   462

            self.SetSelected(False)

   463

        # Initializes the last position

   464

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

   465

   466

    # Method called when a LeftUp event have been generated

   467

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

   468

        # If a dragging have been initiated

   469

        if self.Dragging and self.oldPos:

   470

            self.RefreshModel()

   471

            self.Parent.RefreshBuffer()

   472

        if self.CurrentCursor != 0:

   473

            self.Parent.SetCursor(CURSORS[0])

   474

            self.CurrentCursor = 0

   475

        self.SetSelected(True)

   476

        self.oldPos = None

   477

   478

    # Method called when a RightDown event have been generated

   479

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

   480

        pass

   481

   482

    # Method called when a RightUp event have been generated

   483

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

   484

        if self.Dragging and self.oldPos:

   485

            self.RefreshModel()

   486

            self.Parent.RefreshBuffer()

   487

        if self.CurrentCursor != 0:

   488

            self.Parent.SetCursor(CURSORS[0])

   489

            self.CurrentCursor = 0

   490

        self.SetSelected(True)

   491

        self.oldPos = None

   492

   493

    # Method called when a LeftDClick event have been generated

   494

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

   495

        pass

   496

   497

    # Method called when a Motion event have been generated

   498

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

   499

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

   500

        if event.Dragging() and self.oldPos:

   501

            # Calculate the movement of cursor

   502

            pos = event.GetLogicalPosition(dc)

   503

            movex = pos.x - self.oldPos.x

   504

            movey = pos.y - self.oldPos.y

   505

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

   506

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

   507

                self.Dragging = True

   508

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

   509

            if self.Dragging: