######################################################################
#                                                                    #
#  Copyright 2009-2019 Lucas Heitzmann Gabrielli.                    #
#  This file is part of gdspy, distributed under the terms of the    #
#  Boost Software License - Version 1.0.  See the accompanying       #
#  LICENSE file or <http://www.boost.org/LICENSE_1_0.txt>            #
#                                                                    #
######################################################################
"""
Classes and functions for the visualization of layouts created with the
gdspy Python module.
"""

from __future__ import division
from __future__ import unicode_literals
from __future__ import print_function
from __future__ import absolute_import

import sys

if sys.version_info.major < 3:
    from builtins import zip
    from builtins import open
    from builtins import int
    from builtins import round
    from builtins import range
    from builtins import super

    from future import standard_library

    standard_library.install_aliases()
else:
    # Python 3 doesn't have basestring, as unicode is type string
    # Python 2 doesn't equate unicode to string, but both are basestring
    # Now isinstance(s, basestring) will be True for any python version
    basestring = str

import os
import colorsys
import warnings
import numpy
import tkinter
import tkinter.messagebox
import tkinter.colorchooser

import gdspy

_stipple = tuple(
    "@" + os.path.join(os.path.dirname(gdspy.__file__), "data", "{:02d}.xbm".format(n))
    for n in range(10)
)
_icon_up = "@" + os.path.join(os.path.dirname(gdspy.__file__), "data", "up.xbm")
_icon_down = "@" + os.path.join(os.path.dirname(gdspy.__file__), "data", "down.xbm")
_icon_outline = "@" + os.path.join(
    os.path.dirname(gdspy.__file__), "data", "outline.xbm"
)
_invisible = 9
_tkinteranchors = [
    tkinter.NW,
    tkinter.N,
    tkinter.NE,
    None,
    tkinter.W,
    tkinter.CENTER,
    tkinter.E,
    None,
    tkinter.SW,
    tkinter.S,
    tkinter.SE,
]


class ColorDict(dict):
    def __init__(self, default):
        super(ColorDict, self).__init__()
        self.default = default

    def __missing__(self, key):
        if self.default is None:
            layer, datatype = key
            rgb = "#{0[0]:02x}{0[1]:02x}{0[2]:02x}".format(
                [
                    int(255 * c + 0.5)
                    for c in colorsys.hsv_to_rgb(
                        (layer % 3) / 3.0
                        + (layer % 6 // 3) / 6.0
                        + (layer // 6) / 11.0,
                        1 - ((layer + datatype) % 8) / 12.0,
                        1 - (datatype % 3) / 4.0,
                    )
                ]
            )
        else:
            rgb = self.default
        self[key] = rgb
        return rgb


class PatternDict(dict):
    def __init__(self, default):
        super(PatternDict, self).__init__()
        self.default = default

    def __missing__(self, key):
        if self.default is None:
            pat = (key[0] + key[1]) % 8
        else:
            pat = self.default
        self[key] = pat
        return pat


class LayoutViewer(tkinter.Frame):
    """
    Provide a GUI where the layout can be viewed.

    The view can be scrolled vertically with the mouse wheel, and
    horizontally by holding the shift key and using the mouse wheel.
    Dragging the 2nd mouse button also scrolls the view, and if control
    is held down, it scrolls 10 times faster.

    You can zoom in or out using control plus the mouse wheel, or drag a
    rectangle on the window with the 1st mouse button to zoom into that
    area.

    A ruler is available by clicking the 1st mouse button anywhere on
    the view and moving the mouse around.  The distance is shown in the
    status area.

    Double-clicking on any polygon gives some information about it.

    Color and pattern for each layer/datatype specification can be
    changed by left and right clicking on the icon in the layer/datatype
    list.  Left and right clicking the text label changes the
    visibility.

    Parameters
    ----------
    library : ``GdsLibrary``
        GDSII library to display.
    cells : Cell or iterable
        The array of cells to be included in the view in addition to the
        library cells.
    hidden_types : array-like
        The array of tuples (layer, datatype) to start in hidden state.
    depth : integer
        Initial depth of referenced cells to be displayed.
    color : dictionary
        Dictionary of colors for each tuple (layer, datatype).  The
        colors must be strings in the format ``#rrggbb``.  A value
        with key ``default`` will be used as default color.
    pattern : dictionary
        Dictionary of patterns for each tuple (layer, datatype).  The
        patterns must be integers between 0 and 9, inclusive.  A value
        with key ``default`` will be used as default pattern.
    background : string
        Canvas background color in the format ``#rrggbb``.
    width : integer
        Horizontal size of the viewer canvas.
    height : integer
        Vertical size of the viewer canvas.

    Examples
    --------
    White background, filled shapes:

    >>> gdspy.LayoutViewer(pattern={'default': 8},
    ...                    background='#FFFFFF')

    No filling, black color for layer 0, datatype 1, automatic for
    others:

    >>> gdspy.LayoutViewer(pattern={'default': 9},
    ...                    color={(0, 1): '#000000'})
    """

    def __init__(
        self,
        library=None,
        cells=None,
        hidden_types=[],
        depth=0,
        color={},
        pattern={},
        background="#202020",
        width=800,
        height=600,
    ):
        tkinter.Frame.__init__(self, None)

        self.cells = {} if library is None else dict(library.cells)
        if cells is not None:
            if isinstance(cells, gdspy.Cell):
                self.cells[cells.name] = cells
            else:
                for c in cells:
                    self.cells[c.name] = c
        if len(self.cells) == 0:
            self.cells = dict(gdspy.current_library.cells)
            if len(self.cells) == 0:
                raise ValueError("[GDSPY] No cells to display in LayoutViewer.")
            else:
                warnings.warn(
                    "[GDSPY] Use of the global library is deprecated.  "
                    "Pass LayoutViewer a GdsLibrary instance.",
                    category=DeprecationWarning,
                    stacklevel=2,
                )
        cell_names = list(self.cells.keys())
        self.cell_bb = dict([(s, None) for s in self.cells])

        self.current_cell = tkinter.StringVar()
        self.current_cell.set(cell_names[0])

        self.depth = tkinter.IntVar()
        self.depth.set(depth)

        self.hidden_layers = hidden_types

        self.color = ColorDict(color.get("default", None))
        self.color.update(color)

        self.pattern = PatternDict(pattern.get("default", None))
        self.pattern.update(pattern)

        # Setup resizable window
        self.grid(sticky="nsew")
        top = self.winfo_toplevel()
        top.rowconfigure(0, weight=1)
        top.columnconfigure(0, weight=1)
        self.rowconfigure(0, weight=1)
        self.columnconfigure(0, weight=1)

        # Setup canvas
        self.canvas = tkinter.Canvas(
            self, width=width, height=height, xscrollincrement=0, yscrollincrement=0
        )
        self.canvas.grid(row=0, column=0, sticky="nsew")
        self.canvas.configure(bg=background)
        bg = [int(c, 16) for c in (background[1:3], background[3:5], background[5:7])]
        self.default_outline = "#{0[0]:02x}{0[1]:02x}{0[2]:02x}".format(
            [(0 if c > 127 else 255) for c in bg]
        )
        self.default_grey = "#{0[0]:02x}{0[1]:02x}{0[2]:02x}".format(
            [
                (
                    (c + 256) // 2
                    if c < 85
                    else (c // 2 if c > 171 else (255 if c > 127 else 0))
                )
                for c in bg
            ]
        )

        # Setup scrollbars
        self.xscroll = tkinter.Scrollbar(
            self, orient=tkinter.HORIZONTAL, command=self.canvas.xview
        )
        self.xscroll.grid(row=1, column=0, sticky="ew")
        self.yscroll = tkinter.Scrollbar(
            self, orient=tkinter.VERTICAL, command=self.canvas.yview
        )
        self.yscroll.grid(row=0, column=1, sticky="ns")
        self.canvas["xscrollcommand"] = self.xscroll.set
        self.canvas["yscrollcommand"] = self.yscroll.set

        # Setup toolbar
        self.frame = tkinter.Frame(self)
        self.frame.columnconfigure(6, weight=1)
        self.frame.grid(row=2, column=0, columnspan=2, padx=2, pady=2, sticky="ew")

        # Setup buttons
        self.home = tkinter.Button(
            self.frame, text="Extents", command=self._update_canvas
        )
        self.zoom_in = tkinter.Button(self.frame, text="In", command=self._zoom_in)
        self.zoom_out = tkinter.Button(self.frame, text="Out", command=self._zoom_out)
        self.cell_menu = tkinter.OptionMenu(self.frame, self.current_cell, *cell_names)
        self.depth_spin = tkinter.Spinbox(
            self.frame,
            textvariable=self.depth,
            command=self._update_depth,
            from_=-1,
            to=128,
            increment=1,
            justify=tkinter.RIGHT,
            width=3,
        )
        self.home.grid(row=0, column=0, sticky="w")
        self.zoom_in.grid(row=0, column=1, sticky="w")
        self.zoom_out.grid(row=0, column=2, sticky="w")
        self.cell_menu.grid(row=0, column=3, sticky="w")
        tkinter.Label(self.frame, text="Ref level:").grid(row=0, column=4, sticky="w")
        self.depth_spin.grid(row=0, column=5, sticky="w")
        self.bind_all("<KeyPress-Home>", self._update_canvas)
        self.bind_all("<KeyPress-A>", self._update_canvas)
        self.bind_all("<KeyPress-a>", self._update_canvas)

        # Setup coordinates box
        self.coords = tkinter.Label(self.frame, text="0, 0")
        self.coords.grid(row=0, column=6, sticky="e")

        # Layers
        self.l_canvas = tkinter.Canvas(self)
        self.l_canvas.grid(row=0, column=2, rowspan=3, sticky="nsew")
        self.l_scroll = tkinter.Scrollbar(
            self, orient=tkinter.VERTICAL, command=self.l_canvas.yview
        )
        self.l_scroll.grid(row=0, column=3, rowspan=3, sticky="ns")
        self.l_canvas["yscrollcommand"] = self.l_scroll.set

        # Change current cell
        self.current_cell.trace_variable("w", self._update_canvas)

        # Update depth
        self.depth_spin.bind("<FocusOut>", self._update_depth)

        # Drag-scroll: button 2
        self.canvas.bind("<Button-2>", lambda evt: self.canvas.scan_mark(evt.x, evt.y))
        self.canvas.bind("<Motion>", self._mouse_move)

        # Y scroll: scroll wheel
        self.canvas.bind(
            "<MouseWheel>",
            lambda evt: self.canvas.yview(
                tkinter.SCROLL, 1 if evt.delta < 0 else -1, tkinter.UNITS
            ),
        )
        self.canvas.bind(
            "<Button-4>",
            lambda evt: self.canvas.yview(tkinter.SCROLL, -1, tkinter.UNITS),
        )
        self.canvas.bind(
            "<Button-5>",
            lambda evt: self.canvas.yview(tkinter.SCROLL, 1, tkinter.UNITS),
        )

        self.l_canvas.bind(
            "<MouseWheel>",
            lambda evt: self.l_canvas.yview(
                tkinter.SCROLL, 1 if evt.delta < 0 else -1, tkinter.UNITS
            ),
        )
        self.l_canvas.bind(
            "<Button-4>",
            lambda evt: self.l_canvas.yview(tkinter.SCROLL, -1, tkinter.UNITS),
        )
        self.l_canvas.bind(
            "<Button-5>",
            lambda evt: self.l_canvas.yview(tkinter.SCROLL, 1, tkinter.UNITS),
        )

        # X scroll: shift + scroll wheel
        self.bind_all(
            "<Shift-MouseWheel>",
            lambda evt: self.canvas.xview(
                tkinter.SCROLL, 1 if evt.delta < 0 else -1, tkinter.UNITS
            ),
        )
        self.canvas.bind(
            "<Shift-Button-4>",
            lambda evt: self.canvas.xview(tkinter.SCROLL, -1, tkinter.UNITS),
        )
        self.canvas.bind(
            "<Shift-Button-5>",
            lambda evt: self.canvas.xview(tkinter.SCROLL, 1, tkinter.UNITS),
        )

        # Object properties: double button 1
        # Zoom rectangle: drag button 1
        # Measure tool: button 1 (click + click, no drag)
        self.canvas.bind("<Button-1>", self._zoom_rect_mark)
        self.canvas.bind("<ButtonRelease-1>", self._mouse_btn_1)
        self.canvas.bind("<Double-Button-1>", self._properties)

        # Zoom: control + scroll wheel
        self.bind_all("<Control-MouseWheel>", self._zoom)
        self.canvas.bind("<Control-Button-4>", self._zoom)
        self.canvas.bind("<Control-Button-5>", self._zoom)

        # Update the viewer
        self.shown_cell = None
        self.shown_depth = depth
        self.canvas_margins = None
        self._update_canvas()
        self.master.title("Gdspy - Layout Viewer")
        self.mainloop()

    def _update_depth(self, *args):
        try:
            d = self.depth.get()
        except:
            self.depth.set(self.shown_depth)
            return
        if d != self.shown_depth:
            self.shown_cell = self.current_cell.get()
            self.shown_depth = d
            self._update_data()

    def _update_canvas(self, *args):
        if self.shown_cell is None:
            width = float(self.canvas.cget("width"))
            height = float(self.canvas.cget("height"))
        else:
            width = float(self.canvas.winfo_width()) - self.canvas_margins[0]
            height = float(self.canvas.winfo_height()) - self.canvas_margins[1]
        self.shown_cell = self.current_cell.get()
        if self.cell_bb[self.current_cell.get()] is None:
            bb = [1e300, 1e300, -1e300, -1e300]
            pol_dict = self.cells[self.current_cell.get()].get_polygons(
                by_spec=True, depth=self.shown_depth
            )
            for pols in pol_dict.values():
                for pol in pols:
                    bb[0] = min(bb[0], pol[:, 0].min())
                    bb[1] = min(bb[1], -pol[:, 1].max())
                    bb[2] = max(bb[2], pol[:, 0].max())
                    bb[3] = max(bb[3], -pol[:, 1].min())
            self.cell_bb[self.current_cell.get()] = tuple(bb)
        else:
            bb = list(self.cell_bb[self.current_cell.get()])
        if bb[2] < bb[0]:
            tkinter.messagebox.showwarning("Warning", "The selected cell is empty.")
            bb = [-1, -1, 1, 1]
        self.scale = ((bb[3] - bb[1]) / height, (bb[2] - bb[0]) / width)
        if self.scale[0] > self.scale[1]:
            self.scale = self.scale[0] * 1.05
            add = (width * self.scale - bb[2] + bb[0]) * 0.5
            bb[0] -= add
            bb[2] += add
            add = (bb[3] - bb[1]) * 0.025
            bb[1] -= add
            bb[3] += add
        else:
            self.scale = self.scale[1] * 1.05
            add = (height * self.scale - bb[3] + bb[1]) * 0.5
            bb[1] -= add
            bb[3] += add
            add = (bb[2] - bb[0]) * 0.025
            bb[0] -= add
            bb[2] += add
        self._update_data()
        self.canvas.configure(scrollregion=tuple([x / self.scale for x in bb]))
        self.canvas.zoom_rect = None
        if self.canvas_margins is None:
            self.update()
            self.canvas_margins = (
                int(self.canvas.winfo_width()) - width,
                int(self.canvas.winfo_height()) - height,
            )

    def _update_data(self):
        self.canvas.delete(tkinter.ALL)
        self.l_canvas.delete(tkinter.ALL)
        self.canvas.ruler = None
        self.canvas.x_rl = 0
        self.canvas.y_rl = 0
        pol_dict = self.cells[self.current_cell.get()].get_polygons(
            by_spec=True, depth=self.shown_depth
        )
        lbl_dict = {}
        for label in self.cells[self.current_cell.get()].get_labels(
            depth=self.shown_depth
        ):
            key = (label.layer, label.texttype)
            if key in lbl_dict:
                lbl_dict[key].append(label)
            else:
                lbl_dict[key] = [label]
        layers = list(set(list(pol_dict.keys()) + list(lbl_dict.keys())))
        layers.sort(
            reverse=True, key=lambda i: (-1, -1) if not isinstance(i, tuple) else i
        )
        self.l_canvas_info = []
        pos = 0
        wid = None
        hei = None
        bg = self.canvas["bg"]
        self.l_canvas.configure(bg=bg)
        for i in layers:
            if i in self.hidden_layers:
                state = "hidden"
                fg = self.default_grey
            else:
                state = "normal"
                fg = self.default_outline
            if isinstance(i, tuple):
                lbl = (
                    tkinter.Label(
                        self,
                        bitmap=_icon_outline
                        if self.pattern[i] == _invisible
                        else _stipple[self.pattern[i]],
                        bd=0,
                        fg=self.color[i],
                        bg=bg,
                        anchor="c",
                    ),
                    tkinter.Label(
                        self,
                        text="{0[0]}/{0[1]}".format(i),
                        bd=0,
                        fg=fg,
                        bg=bg,
                        height=1,
                        anchor="c",
                        padx=8,
                    ),
                    tkinter.Label(
                        self,
                        bitmap=_icon_up,
                        bd=0,
                        fg=self.default_outline,
                        bg=bg,
                        anchor="c",
                    ),
                    tkinter.Label(
                        self,
                        bitmap=_icon_down,
                        bd=0,
                        fg=self.default_outline,
                        bg=bg,
                        anchor="c",
                    ),
                )
                lbl[0].bind("<Button-1>", self._change_color(lbl[0], i))
                lbl[0].bind("<Button-2>", self._change_pattern(lbl[0], i))
                lbl[0].bind("<Button-3>", self._change_pattern(lbl[0], i))
                lbl[1].bind("<Button-1>", self._change_visibility(lbl[1], i))
                lbl[1].bind("<Button-2>", self._change_other_visibility(i))
                lbl[1].bind("<Button-3>", self._change_other_visibility(i))
                lbl[2].bind("<Button-1>", self._raise(i))
                lbl[3].bind("<Button-1>", self._lower(i))
                for l in lbl:
                    l.bind(
                        "<MouseWheel>",
                        lambda evt: self.l_canvas.yview(
                            tkinter.SCROLL, 1 if evt.delta < 0 else -1, tkinter.UNITS
                        ),
                    )
                    l.bind(
                        "<Button-4>",
                        lambda evt: self.l_canvas.yview(
                            tkinter.SCROLL, -1, tkinter.UNITS
                        ),
                    )
                    l.bind(
                        "<Button-5>",
                        lambda evt: self.l_canvas.yview(
                            tkinter.SCROLL, 1, tkinter.UNITS
                        ),
                    )
                if wid is None:
                    lbl[1].configure(text="255/255")
                    hei = max(lbl[0].winfo_reqheight(), lbl[1].winfo_reqheight())
                    wid = lbl[1].winfo_reqwidth()
                    lbl[1].configure(text="{0[0]}/{0[1]}".format(i))
                ids = (
                    self.l_canvas.create_window(0, pos, window=lbl[0], anchor="sw"),
                    self.l_canvas.create_window(hei, pos, window=lbl[1], anchor="sw"),
                    self.l_canvas.create_window(
                        hei + wid, pos, window=lbl[2], anchor="sw"
                    ),
                    self.l_canvas.create_window(
                        2 * hei + wid, pos, window=lbl[3], anchor="sw"
                    ),
                )
                self.l_canvas_info.append((i, ids, lbl))
                pos -= hei
            if i in pol_dict:
                if not isinstance(i, tuple):
                    for pol in pol_dict[i]:
                        self.canvas.create_polygon(
                            *list((numpy.array((1, -1)) * pol / self.scale).flatten()),
                            fill="",
                            outline=self.default_outline,
                            activeoutline=self.default_outline,
                            activewidth=2,
                            tag=("L" + str(i), "V" + str(pol.shape[0])),
                            state=state,
                            dash=(8, 8)
                        )
                        self.canvas.create_text(
                            pol[:, 0].mean() / self.scale,
                            pol[:, 1].mean() / -self.scale,
                            text=i,
                            anchor=tkinter.CENTER,
                            fill=self.default_outline,
                            tag=("L" + str(i), "TEXT"),
                        )
                else:
                    for pol in pol_dict[i]:
                        self.canvas.create_polygon(
                            *list((numpy.array((1, -1)) * pol / self.scale).flatten()),
                            fill=self.color[i],
                            stipple=_stipple[self.pattern[i]],
                            offset="{},{}".format(*numpy.random.randint(16, size=2)),
                            outline=self.color[i],
                            activeoutline=self.default_outline,
                            activewidth=2,
                            tag=("L" + str(i), "V" + str(pol.shape[0])),
                            state=state
                        )
            if i in lbl_dict:
                for label in lbl_dict[i]:
                    self.canvas.create_text(
                        label.position[0] / self.scale,
                        label.position[1] / -self.scale,
                        text=label.text,
                        anchor=_tkinteranchors[label.anchor],
                        fill=self.color[i],
                        activefill=self.default_outline,
                        tag=("L" + str(i), "TEXT"),
                        state=state,
                    )
        if (wid is None) or (hei is None) or (pos is None):
            pos = -12
            hei = 12
            wid = 12
        self.l_canvas.configure(
            width=3 * hei + wid,
            scrollregion=(0, pos, 3 * hei + wid, 0),
            yscrollincrement=hei,
        )

    def _change_color(self, lbl, layer):
        def func(*args):
            rgb, color = tkinter.colorchooser.askcolor(
                self.color[layer], title="Select color"
            )
            if color is not None:
                self.color[layer] = color
                lbl.configure(fg=color)
                for i in self.canvas.find_withtag("L" + str(layer)):
                    self.canvas.itemconfigure(i, fill=color)
                    if layer[0] >= 0 and "TEXT" not in self.canvas.gettags(i):
                        self.canvas.itemconfigure(i, outline=color)

        return func

    def _change_pattern(self, lbl, layer):
        def func(*args):
            pattern = []
            dlg = tkinter.Toplevel()
            dlg.title("Select pattern")
            dlg.resizable(False, False)
            for i in range(10):
                choice = tkinter.Button(
                    dlg,
                    bitmap=_stipple[i],
                    command=(lambda x: (lambda: pattern.append(x) or dlg.destroy()))(i),
                )
                choice.grid(row=0, column=i, padx=3, pady=3)
            choice = tkinter.Button(dlg, text="Cancel", command=dlg.destroy)
            choice.grid(row=1, column=0, columnspan=10, padx=3, pady=3, sticky="e")
            dlg.focus_set()
            dlg.wait_visibility()
            dlg.grab_set()
            dlg.wait_window(dlg)
            if len(pattern) > 0:
                self.pattern[layer] = pattern[0]
                lbl.configure(
                    bitmap=_icon_outline
                    if pattern[0] == _invisible
                    else _stipple[pattern[0]]
                )
                for i in self.canvas.find_withtag("L" + str(layer)):
                    if "TEXT" not in self.canvas.gettags(i):
                        self.canvas.itemconfigure(i, stipple=_stipple[pattern[0]])

        return func

    def _change_visibility(self, lbl, layer):
        def func(*args):
            if layer in self.hidden_layers:
                self.hidden_layers.remove(layer)
                lbl.configure(fg=self.default_outline)
                for j in self.canvas.find_withtag("L" + str(layer)):
                    self.canvas.itemconfigure(j, state="normal")
            else:
                self.hidden_layers.append(layer)
                lbl.configure(fg=self.default_grey)
                for j in self.canvas.find_withtag("L" + str(layer)):
                    self.canvas.itemconfigure(j, state="hidden")

        return func

    def _change_other_visibility(self, layer):
        def func(*args):
            for other, ids, lbl in self.l_canvas_info:
                if layer != other:
                    unhide = other in self.hidden_layers
                    break
            for other, ids, lbl in self.l_canvas_info:
                if layer != other:
                    if unhide and (other in self.hidden_layers):
                        self.hidden_layers.remove(other)
                        lbl[1].configure(fg=self.default_outline)
                        for j in self.canvas.find_withtag("L" + str(other)):
                            self.canvas.itemconfigure(j, state="normal")
                    elif not (unhide or (other in self.hidden_layers)):
                        self.hidden_layers.append(other)
                        lbl[1].configure(fg=self.default_grey)
                        for j in self.canvas.find_withtag("L" + str(other)):
                            self.canvas.itemconfigure(j, state="hidden")

        return func

    def _raise(self, layer):
        def func(*args):
            idx = 0
            while self.l_canvas_info[idx][0] != layer:
                idx += 1
            if idx < len(self.l_canvas_info) - 1:
                hei = int(self.l_canvas["yscrollincrement"])
                under, idu, _ = self.l_canvas_info[idx]
                above, ida, _ = self.l_canvas_info[idx + 1]
                self.canvas.tag_raise("L" + str(under), "L" + str(above))
                for i in idu:
                    self.l_canvas.move(i, 0, -hei)
                for i in ida:
                    self.l_canvas.move(i, 0, hei)
                self.l_canvas.yview_scroll(-1, tkinter.UNITS)
                self.l_canvas_info[idx], self.l_canvas_info[idx + 1] = (
                    self.l_canvas_info[idx + 1],
                    self.l_canvas_info[idx],
                )

        return func

    def _lower(self, layer):
        def func(*args):
            idx = 0
            while self.l_canvas_info[idx][0] != layer:
                idx += 1
            if idx > 0:
                hei = int(self.l_canvas["yscrollincrement"])
                under, idu, _ = self.l_canvas_info[idx - 1]
                above, ida, _ = self.l_canvas_info[idx]
                self.canvas.tag_raise("L" + str(under), "L" + str(above))
                for i in idu:
                    self.l_canvas.move(i, 0, -hei)
                for i in ida:
                    self.l_canvas.move(i, 0, hei)
                self.l_canvas.yview_scroll(1, tkinter.UNITS)
                self.l_canvas_info[idx], self.l_canvas_info[idx - 1] = (
                    self.l_canvas_info[idx - 1],
                    self.l_canvas_info[idx],
                )

        return func

    def _mouse_move(self, evt):
        x = self.canvas.canvasx(evt.x)
        y = self.canvas.canvasy(evt.y)
        if self.canvas.ruler is None:
            self.coords.configure(
                text="{0:g}, {1:g}".format(x * self.scale, -y * self.scale)
            )
        else:
            self.canvas.coords(
                self.canvas.ruler, self.canvas.x_rl, self.canvas.y_rl, x, y
            )
            dx = (x - self.canvas.x_rl) * self.scale
            dy = (self.canvas.y_rl - y) * self.scale
            self.coords.configure(
                text="Distance: {0:g} | dx = {1:g} | dy = {2:g}".format(
                    (dx ** 2 + dy ** 2) ** 0.5, dx, dy
                )
            )
        if int(evt.state) & 0x0200:
            if int(evt.state) & 0x0004:
                self.canvas.scan_dragto(evt.x, evt.y, 10)
            else:
                self.canvas.scan_dragto(evt.x, evt.y, 1)
        elif int(evt.state) & 0x0100:
            if self.canvas.zoom_rect is None:
                self.canvas.zoom_rect = self.canvas.create_rectangle(
                    self.canvas.x_zr,
                    self.canvas.y_zr,
                    self.canvas.x_zr,
                    self.canvas.y_zr,
                    outline="#DDD",
                )
            self.canvas.coords(
                self.canvas.zoom_rect, self.canvas.x_zr, self.canvas.y_zr, x, y
            )

    def _zoom(self, evt):
        if evt.num == 4:
            evt.delta = 1
        elif evt.num == 5:
            evt.delta = -1
        s = 1.5 if evt.delta > 0 else 1 / 1.5
        self.scale /= s
        x0 = s * self.canvas.canvasx(evt.x) - evt.x
        y0 = s * self.canvas.canvasy(evt.y) - evt.y
        self.canvas.scale(tkinter.ALL, 0, 0, s, s)
        self.canvas.x_rl *= s
        self.canvas.y_rl *= s
        bb = self.canvas.bbox(tkinter.ALL)
        if bb is not None:
            w = (bb[2] - bb[0]) * 1.2
            h = (bb[3] - bb[1]) * 1.2
            bb = (bb[0] - w, bb[1] - h, bb[2] + w, bb[3] + h)
            self.canvas["scrollregion"] = bb
            self.canvas.xview(tkinter.MOVETO, (x0 - bb[0]) / (bb[2] - bb[0]))
            self.canvas.yview(tkinter.MOVETO, (y0 - bb[1]) / (bb[3] - bb[1]))

    def _zoom_in(self):
        s = 1.5
        self.scale /= s
        self.canvas.scale(tkinter.ALL, 0, 0, s, s)
        self.canvas.x_rl *= s
        self.canvas.y_rl *= s
        bb = self.canvas.bbox(tkinter.ALL)
        w = (bb[2] - bb[0]) * 1.2
        h = (bb[3] - bb[1]) * 1.2
        bb = (bb[0] - w, bb[1] - h, bb[2] + w, bb[3] + h)
        self.canvas["scrollregion"] = bb
        x0 = self.xscroll.get()
        x0 = 0.5 * (x0[1] + x0[0]) - 0.5 * (
            (float(self.canvas.winfo_width()) - self.canvas_margins[0])
            / (bb[2] - bb[0])
        )
        y0 = self.yscroll.get()
        y0 = 0.5 * (y0[1] + y0[0]) - 0.5 * (
            (float(self.canvas.winfo_height()) - self.canvas_margins[1])
            / (bb[3] - bb[1])
        )
        self.canvas.xview(tkinter.MOVETO, x0)
        self.canvas.yview(tkinter.MOVETO, y0)

    def _zoom_out(self):
        s = 1 / 1.5
        self.scale /= s
        self.canvas.scale(tkinter.ALL, 0, 0, s, s)
        self.canvas.x_rl *= s
        self.canvas.y_rl *= s
        bb = self.canvas.bbox(tkinter.ALL)
        w = (bb[2] - bb[0]) * 1.2
        h = (bb[3] - bb[1]) * 1.2
        bb = (bb[0] - w, bb[1] - h, bb[2] + w, bb[3] + h)
        self.canvas["scrollregion"] = bb
        x0 = self.xscroll.get()
        x0 = 0.5 * (x0[1] + x0[0]) - 0.5 * (
            (float(self.canvas.winfo_width()) - self.canvas_margins[0])
            / (bb[2] - bb[0])
        )
        y0 = self.yscroll.get()
        y0 = 0.5 * (y0[1] + y0[0]) - 0.5 * (
            (float(self.canvas.winfo_height()) - self.canvas_margins[1])
            / (bb[3] - bb[1])
        )
        self.canvas.xview(tkinter.MOVETO, x0)
        self.canvas.yview(tkinter.MOVETO, y0)

    def _zoom_rect_mark(self, evt):
        self.canvas.x_zr = float(self.canvas.canvasx(evt.x))
        self.canvas.y_zr = float(self.canvas.canvasy(evt.y))

    def _mouse_btn_1(self, evt):
        if self.canvas.zoom_rect is None:
            if self.canvas.ruler is None:
                x0 = self.canvas.canvasx(evt.x)
                y0 = self.canvas.canvasy(evt.y)
                self.canvas.ruler = self.canvas.create_line(
                    x0,
                    y0,
                    x0,
                    y0,
                    arrow=tkinter.BOTH,
                    fill=self.default_outline,
                    width=2,
                )
                self.canvas.x_rl = x0
                self.canvas.y_rl = y0
            else:
                self.canvas.delete(self.canvas.ruler)
                self.canvas.ruler = None
        else:
            x1 = float(self.canvas.winfo_width()) - self.canvas_margins[0]
            sx = float(self.canvas.canvasx(evt.x))
            dx = abs(self.canvas.x_zr - sx)
            sx += self.canvas.x_zr
            y1 = float(self.canvas.winfo_height()) - self.canvas_margins[1]
            sy = float(self.canvas.canvasy(evt.y))
            dy = abs(self.canvas.y_zr - sy)
            sy += self.canvas.y_zr
            self.canvas.delete(self.canvas.zoom_rect)
            self.canvas.zoom_rect = None
            if abs(dx * dy) > 1.0e-12:
                s = (x1 / dx, y1 / dy)
                if s[0] < s[1]:
                    s = s[0]
                    y0 = 0.5 * (s * sy - y1)
                    x0 = 0.5 * s * (sx - dx)
                else:
                    s = s[1]
                    x0 = 0.5 * (s * sx - x1)
                    y0 = 0.5 * s * (sy - dy)
                self.scale /= s
                self.canvas.scale(tkinter.ALL, 0, 0, s, s)
                self.canvas.x_rl *= s
                self.canvas.y_rl *= s
                bb = self.canvas.bbox(tkinter.ALL)
                if bb is not None:
                    w = (bb[2] - bb[0]) * 1.5
                    h = (bb[3] - bb[1]) * 1.5
                    bb = (bb[0] - w, bb[1] - h, bb[2] + w, bb[3] + h)
                    self.canvas["scrollregion"] = bb
                    self.canvas.xview(tkinter.MOVETO, (x0 - bb[0]) / (bb[2] - bb[0]))
                    self.canvas.yview(tkinter.MOVETO, (y0 - bb[1]) / (bb[3] - bb[1]))

    def _properties(self, evt):
        if self.canvas.ruler is not None:
            self.canvas.delete(self.canvas.ruler)
            self.canvas.ruler = -1
        i = self.canvas.find_closest(
            self.canvas.canvasx(evt.x), self.canvas.canvasy(evt.y)
        )
        bb = self.canvas.bbox(i)
        if bb is not None:
            bb = (
                bb[0] * self.scale,
                -bb[3] * self.scale,
                bb[2] * self.scale,
                -bb[1] * self.scale,
            )
            tags = self.canvas.gettags(i)
            if "TEXT" not in tags:
                tkinter.messagebox.showinfo(
                    "Element information",
                    "Layer/datatpe: {0}\nVertices: {1}\nApproximate bounding box:\n({2[0]:g}, {2[1]:g}) - ({2[2]:g}, {2[3]:g})".format(
                        tags[0][1:], tags[1][1:], bb
                    ),
                    parent=self.canvas,
                )
