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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

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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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    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_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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    64

# 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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    72

# 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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    78

# 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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#                    Helper for highlighting error in drawn text

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

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

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    dc.SetPen(wx.TRANSPARENT_PEN)

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    dc.SetLogicalFunction(wx.AND)

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

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

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    dc.SetLogicalFunction(wx.XOR)

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

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

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    dc.SetLogicalFunction(wx.COPY)

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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)

   312

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

   314

        self.CurrentCursor = 0

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        ResetCursors()

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   326

    def IsOfType(self, type, reference):

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        return self.Parent.IsOfType(type, reference)

   328

   329

    def IsEndType(self, type):

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        return self.Parent.IsEndType(type)

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   332

    def GetDragging(self):

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        return self.Dragging

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   335

    # 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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   339

    # 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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   346

    # Returns the block position

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    def GetPosition(self):

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

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   350

    # Changes the element size

   351

    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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   357

    # Returns the element size

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    def GetSize(self):

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

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   361

    # 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])

   364

   365

    # Refresh the element connectors position

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    def RefreshConnectors(self):

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        pass

   368

   369

    # 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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   373

    # Change the parent

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    def SetParent(self, parent):

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        self.Parent = parent

   376

   377

    # 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

   380

   381

    # Returns the Id

   382

    def GetId(self):

   383

        return self.Id

   384

   385

    # 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

   388

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

   389

   390

    # Returns if the point given is in the bounding box

   391

    def IsInSelection(self, rect):

   392

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

   393

   394

    # Override this method for refreshing the bounding box

   395

    def RefreshBoundingBox(self):

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        pass

   397

   398

    # Returns the bounding box

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    def GetBoundingBox(self):

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        return self.BoundingBox

   401

   402

    # Returns the RedrawRect

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

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        rect = wx.Rect()

   405

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

   406

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

   407

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

   408

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

   409

        return rect

   410

   411

    def Refresh(self, rect = None):

   412

        if rect is not None:

   413

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

   414

        else:

   415

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

   416

   417

    # Change the variable that indicates if this element is selected

   418

    def SetSelected(self, selected):

   419

        self.Selected = selected

   420

        self.Refresh()

   421

   422

    # Change the variable that indicates if this element is highlighted

   423

    def SetHighlighted(self, highlighted):

   424

        self.Highlighted = highlighted

   425

        self.Refresh()

   426

   427

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

   428

    def TestHandle(self, pt):

   429

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

   430

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

   431

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

   432

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

   433

        # Verify that this element is selected

   434

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

   435

            # Find if point is on a handle horizontally

   436

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

   437

                handle_x = 1

   438

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

   439

                handle_x = 2

   440

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

   441

                handle_x = 3

   442

            else:

   443

                handle_x = 0

   444

            # Find if point is on a handle vertically

   445

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

   446

                handle_y = 1

   447

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

   448

                handle_y = 2

   449

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

   450

                handle_y = 3

   451

            else:

   452

                handle_y = 0

   453

            # Verify that the result is valid

   454

            if (handle_x, handle_y) in VALID_HANDLES:

   455

                return handle_x, handle_y

   456

        return 0, 0

   457

   458

    # Method called when a LeftDown event have been generated

   459

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

   460

        pos = event.GetLogicalPosition(dc)

   461

        # Test if an handle have been clicked

   462

        handle = self.TestHandle(pos)

   463

        # Find which type of handle have been clicked,

   464

        # Save a resize event and change the cursor

   465

        cursor = HANDLE_CURSORS.get(handle, 1)

   466

        if cursor != self.CurrentCursor:

   467

            self.Parent.SetCursor(CURSORS[cursor])

   468

            self.CurrentCursor = cursor

   469

        if cursor > 1:

   470

            self.Handle = (HANDLE_RESIZE, handle)

   471

        else:

   472

            self.Handle = (HANDLE_MOVE, None)

   473

            self.SetSelected(False)

   474

        # Initializes the last position

   475

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

   476

   477

    # Method called when a LeftUp event have been generated

   478

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

   479

        # If a dragging have been initiated

   480

        if self.Dragging and self.oldPos:

   481

            self.RefreshModel()

   482

            self.Parent.RefreshBuffer()

   483

        if self.CurrentCursor != 0:

   484

            self.Parent.SetCursor(CURSORS[0])

   485

            self.CurrentCursor = 0

   486

        self.SetSelected(True)

   487

        self.oldPos = None

   488

   489

    # Method called when a RightDown event have been generated

   490

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

   491

        pass

   492

   493

    # Method called when a RightUp event have been generated

   494

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

   495

        if self.Dragging and self.oldPos:

   496

            self.RefreshModel()

   497

            self.Parent.RefreshBuffer()

   498

        if self.CurrentCursor != 0:

   499

            self.Parent.SetCursor(CURSORS[0])

   500

            self.CurrentCursor = 0

   501

        self.SetSelected(True)

   502

        self.oldPos = None

   503

   504

    # Method called when a LeftDClick event have been generated

   505

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

   506

        pass

   507

   508

    # Method called when a Motion event have been generated

   509