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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 graphics.GraphicCommons import GetScaledEventPosition

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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 for graphic Viewers

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"""

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class RubberBand:

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    def __init__(self, viewer):

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        """

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        Constructor

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        @param viewer: Viewer on which rubberband must be drawn

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        """

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        self.Viewer = viewer

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        # wx.Panel on which rubberband will be drawn

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        self.DrawingSurface = viewer.Editor

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        self.Reset()

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    def Reset(self):

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        """

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        Initialize internal attributes of rubberband

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        """

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        self.StartPoint = None

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        self.CurrentBBox = None

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        self.LastBBox = None

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    def IsShown(self):

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        """

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        Indicate if rubberband is drawn on viewer

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        @return: True if rubberband is drawn

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        """

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        return self.CurrentBBox != None

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    def GetCurrentExtent(self):

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        """

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        Return the rubberband bounding box

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        @return: Rubberband bounding box (wx.Rect object)

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        """

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        # In case of rubberband not shown, return the last rubberband

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        # bounding box

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        if self.IsShown():

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            return self.CurrentBBox

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        return self.LastBBox

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

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        """

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        Called when left mouse is pressed on Viewer. Starts to edit a new

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        rubberband bounding box

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        @param event: Mouse event

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        @param dc: Device Context of Viewer

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        @param scaling: PLCOpen scaling applied on Viewer

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        """

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        # Save the point where mouse was pressed in Viewer unit, position may

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        # be modified by scroll and zoom applied on viewer

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

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        # Initialize rubberband bounding box

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        self.CurrentBBox = wx.Rect(self.StartPoint.x, self.StartPoint.y, 0, 0)

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        # Change viewer mouse cursor to reflect a rubberband bounding box is

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        # edited

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

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        self.Redraw()

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

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        """

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        Called when mouse is dragging over Viewer. Update the current edited

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        rubberband bounding box

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        @param event: Mouse event

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        @param dc: Device Context of Viewer

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        @param scaling: PLCOpen scaling applied on Viewer

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        """

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        # Get mouse position in Viewer unit, position may be modified by scroll

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        # and zoom applied on viewer

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        pos = GetScaledEventPosition(event, dc, scaling)

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        # Save the last bounding box drawn for erasing it later

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

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        self.LastBBox.Union(self.CurrentBBox)

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        # Calculate new position and size of the box 

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        self.CurrentBBox.x = min(pos.x, self.StartPoint.x)

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        self.CurrentBBox.y = min(pos.y, self.StartPoint.y)

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        self.CurrentBBox.width = abs(pos.x - self.StartPoint.x) + 1

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        self.CurrentBBox.height = abs(pos.y - self.StartPoint.y) + 1

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        self.Redraw()

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

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        """

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        Called when mouse is release from Viewer. Erase the current edited

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        rubberband bounding box

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        @param event: Mouse event

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        @param dc: Device Context of Viewer

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        @param scaling: PLCOpen scaling applied on Viewer

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        """

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        # Change viewer mouse cursor to default

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        self.DrawingSurface.SetCursor(wx.NullCursor)

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        # Save the last edited bounding box

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        self.LastBBox = self.CurrentBBox

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        self.CurrentBBox = None

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        self.Redraw()

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    def DrawBoundingBoxes(self, bboxes, dc=None):

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        """

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        Draw a list of bounding box on Viewer in the order given using XOR 

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        logical function

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        @param bboxes: List of bounding boxes to draw on viewer

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        @param dc: Device Context of Viewer (default None)

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        """

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        # Get viewer Device Context if not given

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        if dc is None:

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            dc = self.Viewer.GetLogicalDC()

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        # Save current viewer scale factors before resetting them in order to

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        # avoid rubberband pen to be scaled

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        scalex, scaley = dc.GetUserScale()

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        dc.SetUserScale(1, 1)

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        # Set DC drawing style

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        dc.SetPen(wx.Pen(wx.WHITE, style=wx.DOT))

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        dc.SetBrush(wx.TRANSPARENT_BRUSH)

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        dc.SetLogicalFunction(wx.XOR)

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        # Draw the bounding boxes using viewer scale factor

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        for bbox in bboxes:

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            if bbox is not None:

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                dc.DrawRectangle(

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                    bbox.x * scalex, bbox.y * scaley, 

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                    bbox.width * scalex, bbox.height * scaley)

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        dc.SetLogicalFunction(wx.COPY)

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        # Restore Viewer scale factor

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        dc.SetUserScale(scalex, scaley)

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    def Redraw(self, dc = None):

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        """

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        Redraw rubberband on Viewer

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        @param dc: Device Context of Viewer (default None)

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        """

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        # Erase last bbox and draw current bbox

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        self.DrawBoundingBoxes([self.LastBBox, self.CurrentBBox], dc)

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    def Erase(self, dc = None):

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        """

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        Erase rubberband from Viewer

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        @param dc: Device Context of Viewer (default None)

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        """

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        # Erase last bbox

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        self.DrawBoundingBoxes([self.LastBBox], dc)

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    def Draw(self, dc = None):

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        """

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        Draw rubberband on Viewer

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        @param dc: Device Context of Viewer (default None)

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        """

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        # Erase last bbox and draw current bbox

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        self.DrawBoundingBoxes([self.CurrentBBox], dc)