graphics/RubberBand.py
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Thu, 17 Nov 2016 13:48:04 +0300
changeset 1565 894f31f8ca64
parent 1273 921858d68a13
child 1571 486f94a8032c
permissions -rw-r--r--
make about dialog boxes use standard wx about dialogs

Any information in dialog can be easily changed without much effort
and the dialog can be easy translated.

Unfortunately on Windows there is no good standard about dialog,
therefore own implementation is used there.
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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)