Thuban/UI/view.py

# Copyright (c) 2001, 2002 by Intevation GmbH
# Authors:
# Bernhard Herzog <[email protected]>
#
# This program is free software under the GPL (>=v2)
# Read the file COPYING coming with Thuban for details.

"""
Classes for display of a map and interaction with it
"""

__version__ = "$Revision$"

from math import hypot

from wxPython.wx import wxWindow,\
     wxPaintDC, wxColour, wxClientDC, wxINVERT, wxTRANSPARENT_BRUSH, wxFont,\
     EVT_PAINT, EVT_LEFT_DOWN, EVT_LEFT_UP, EVT_MOTION, EVT_LEAVE_WINDOW


from wxPython import wx

from wxproj import point_in_polygon_shape, shape_centroid


from Thuban.Model.messages import MAP_PROJECTION_CHANGED, \
     LAYERS_CHANGED, LAYER_LEGEND_CHANGED, LAYER_VISIBILITY_CHANGED
from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \
     SHAPETYPE_POINT
from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \
     ALIGN_LEFT, ALIGN_RIGHT
from Thuban.Lib.connector import Publisher

from renderer import ScreenRenderer, PrinterRender

import labeldialog

from messages import SELECTED_SHAPE, VIEW_POSITION


#
#   The tools
#

class Tool:

    """
    Base class for the interactive tools
    """

    def __init__(self, view):
        """Intitialize the tool. The view is the canvas displaying the map"""
        self.view = view
        self.start = self.current = None
        self.dragging = 0
        self.drawn = 0

    def Name(self):
        """Return the tool's name"""
        return ''

    def drag_start(self, x, y):
        self.start = self.current = x, y
        self.dragging = 1

    def drag_move(self, x, y):
        self.current = x, y

    def drag_stop(self, x, y):
        self.current = x, y
        self.dragging = 0

    def Show(self, dc):
        if not self.drawn:
            self.draw(dc)
        self.drawn = 1

    def Hide(self, dc):
        if self.drawn:
            self.draw(dc)
        self.drawn = 0

    def draw(self, dc):
        pass

    def MouseDown(self, event):
        self.drag_start(event.m_x, event.m_y)

    def MouseMove(self, event):
        if self.dragging:
            self.drag_move(event.m_x, event.m_y)

    def MouseUp(self, event):
        if self.dragging:
            self.drag_move(event.m_x, event.m_y)

    def Cancel(self):
        self.dragging = 0


class RectTool(Tool):

    """Base class for tools that draw rectangles while dragging"""

    def draw(self, dc):
        sx, sy = self.start
        cx, cy = self.current
        dc.DrawRectangle(sx, sy, cx - sx, cy - sy)

class ZoomInTool(RectTool):

    """The Zoom-In Tool"""

    def Name(self):
        return "ZoomInTool"

    def proj_rect(self):
        """return the rectangle given by start and current in projected
        coordinates"""
        sx, sy = self.start
        cx, cy = self.current
        left, top = self.view.win_to_proj(sx, sy)
        right, bottom = self.view.win_to_proj(cx, cy)
        return (min(left, right), min(top, bottom),
                max(left, right), max(top, bottom))

    def MouseUp(self, event):
        if self.dragging:
            Tool.MouseUp(self, event)
            sx, sy = self.start
            cx, cy = self.current
            if sx == cx and sy == cy:
                # Just a mouse click. Simply zoom in by a factor of two
                self.view.ZoomFactor(2, center = (cx, cy))
            else:
                # A drag. Zoom in to the rectangle
                self.view.FitRectToWindow(self.proj_rect())


class ZoomOutTool(RectTool):

    """The Zoom-Out Tool"""
    
    def Name(self):
        return "ZoomOutTool"

    def MouseUp(self, event):
        if self.dragging:
            Tool.MouseUp(self, event)
            sx, sy = self.start
            cx, cy = self.current
            if sx == cx and sy == cy:
                # Just a mouse click. Simply zoom out by a factor of two
                self.view.ZoomFactor(0.5, center = (cy, cy))
            else:
                # A drag. Zoom out to the rectangle
                self.view.ZoomOutToRect((min(sx, cx), min(sy, cy),
                                         max(sx, cx), max(sy, cy)))


class PanTool(Tool):

    """The Pan Tool"""

    def Name(self):
        return "PanTool"

    def MouseMove(self, event):
        if self.dragging:
            x0, y0 = self.current
            Tool.MouseMove(self, event)
            x, y = self.current
            width, height = self.view.GetSizeTuple()
            dc = self.view.drag_dc
            dc.Blit(0, 0, width, height, dc, x0 - x, y0 - y)

    def MouseUp(self, event):
        if self.dragging:
            Tool.MouseUp(self, event)
            sx, sy = self.start
            cx, cy = self.current
            self.view.Translate(cx - sx, cy - sy)
        
class IdentifyTool(Tool):

    """The "Identify" Tool"""
    
    def Name(self):
        return "IdentifyTool"

    def MouseUp(self, event):
        self.view.SelectShapeAt(event.m_x, event.m_y)


class LabelTool(Tool):

    """The "Label" Tool"""

    def Name(self):
        return "LabelTool"

    def MouseUp(self, event):
        self.view.LabelShapeAt(event.m_x, event.m_y)


class MapPrintout(wx.wxPrintout):

    """
    wxPrintout class for printing Thuban maps
    """

    def __init__(self, map):
        wx.wxPrintout.__init__(self)
        self.map = map

    def GetPageInfo(self):
        return (1, 1, 1, 1)

    def HasPage(self, pagenum):
        return pagenum == 1

    def OnPrintPage(self, pagenum):
        if pagenum == 1:
            self.draw_on_dc(self.GetDC())

    def draw_on_dc(self, dc):
        width, height = self.GetPageSizePixels()
        llx, lly, urx, ury = self.map.ProjectedBoundingBox()
        scalex = width / (urx - llx)
        scaley = height / (ury - lly)
        scale = min(scalex, scaley)
        offx = 0.5 * (width - (urx + llx) * scale)
        offy = 0.5 * (height + (ury + lly) * scale)

        resx, resy = self.GetPPIPrinter()
        renderer = PrinterRender(dc, scale, (offx, offy), resolution = resx)
        renderer.RenderMap(self.map)
        return wx.true
        

class MapCanvas(wxWindow, Publisher):

    """A widget that displays a map and offers some interaction"""

    def __init__(self, parent, winid, interactor):
        wxWindow.__init__(self, parent, winid)
        self.SetBackgroundColour(wxColour(255, 255, 255))

        # the map displayed in this canvas. Set with SetMap()
        self.map = None

        # scale and offset describe the transformation from projected
        # coordinates to window coordinates.
        self.scale = 1.0
        self.offset = (0, 0)

        # whether the user is currently dragging the mouse, i.e. moving
        # the mouse while pressing a mouse button
        self.dragging = 0

        # the currently active tool
        self.tool = None

        # The current mouse position of the last OnMotion event or None
        # if the mouse is outside the window.
        self.current_position = None


        # If true, OnIdle will call do_redraw to do the actual
        # redrawing. Set by OnPaint to avoid some unnecessary redraws.
        # To force a redraw call full_redraw().
        self.redraw_on_idle = 0

        # the bitmap serving as backing store
        self.bitmap = None

        # the interactor
        self.interactor = interactor
        self.interactor.Subscribe(SELECTED_SHAPE, self.shape_selected)

        # subscribe the WX events we're interested in
        EVT_PAINT(self, self.OnPaint)
        EVT_LEFT_DOWN(self, self.OnLeftDown)
        EVT_LEFT_UP(self, self.OnLeftUp)
        EVT_MOTION(self, self.OnMotion)
        EVT_LEAVE_WINDOW(self, self.OnLeaveWindow)
        wx.EVT_SIZE(self, self.OnSize)
        wx.EVT_IDLE(self, self.OnIdle)

    def __del__(self):
        wxWindow.__del__(self)
        Publisher.__del__(self)

    def OnPaint(self, event):
        dc = wxPaintDC(self)
        if self.map is not None and self.map.HasLayers():
            # We have a non-empty map. Redraw it in idle time
            self.redraw_on_idle = 1
        else:
            # If we've got no map or if the map is empty, simply clear
            # the screen.
            
            # XXX it's probably possible to get rid of this. The
            # background color of the window is already white and the
            # only thing we may have to do is to call self.Refresh()
            # with a true argument in the right places.
            dc.BeginDrawing()
            dc.Clear()            
            dc.EndDrawing()

    def do_redraw(self):
        # This should only be called if we have a non-empty map. We draw
        # it into a memory DC and then blit it to the screen.

        width, height = self.GetSizeTuple()

        # If self.bitmap's still there, reuse it. Otherwise redraw it
        if self.bitmap is not None:
            bitmap = self.bitmap
        else:
            bitmap = wx.wxEmptyBitmap(width, height)
            dc = wx.wxMemoryDC()
            dc.SelectObject(bitmap)
            dc.BeginDrawing()

            # clear the background
            dc.SetBrush(wx.wxWHITE_BRUSH)
            dc.SetPen(wx.wxTRANSPARENT_PEN)
            dc.DrawRectangle(0, 0, width, height)

            if 1: #self.interactor.selected_map is self.map:
                selected_layer = self.interactor.selected_layer
                selected_shape = self.interactor.selected_shape
            else:
                selected_layer = None
                selected_shape = None

            # draw the map into the bitmap
            renderer = ScreenRenderer(dc, self.scale, self.offset)
            renderer.RenderMap(self.map, selected_layer, selected_shape)

            dc.EndDrawing()
            dc.SelectObject(wx.wxNullBitmap)
            self.bitmap = bitmap

        # blit the bitmap to the screen
        dc = wx.wxMemoryDC()
        dc.SelectObject(bitmap)
        clientdc = wxClientDC(self)
        clientdc.BeginDrawing()
        clientdc.Blit(0, 0, width, height, dc, 0, 0)
        clientdc.EndDrawing()

    def Print(self):
        printer = wx.wxPrinter()
        printout = MapPrintout(self.map)
        printer.Print(self, printout, wx.true)
        printout.Destroy()
        
    def SetMap(self, map):
        redraw_channels = (LAYERS_CHANGED, LAYER_LEGEND_CHANGED,
                           LAYER_VISIBILITY_CHANGED)
        if self.map is not None:
            for channel in redraw_channels:
                self.map.Unsubscribe(channel, self.full_redraw)
            self.map.Unsubscribe(MAP_PROJECTION_CHANGED,
                                 self.projection_changed)
        self.map = map
        if self.map is not None:
            for channel in redraw_channels:
                self.map.Subscribe(channel, self.full_redraw)
            self.map.Subscribe(MAP_PROJECTION_CHANGED, self.projection_changed)
        self.FitMapToWindow()
        # force a redraw. If map is not empty, it's already been called
        # by FitMapToWindow but if map is empty it hasn't been called
        # yet so we have to explicitly call it.
        self.full_redraw()

    def Map(self):
        return self.map

    def redraw(self, *args):
        self.Refresh(0)

    def full_redraw(self, *args):
        self.bitmap = None
        self.redraw()

    def projection_changed(self, *args):
        self.FitMapToWindow()
        self.full_redraw()

    def set_view_transform(self, scale, offset):
        self.scale = scale
        self.offset = offset
        self.full_redraw()

    def proj_to_win(self, x, y):
        """\
        Return the point in  window coords given by projected coordinates x y
        """
        offx, offy = self.offset
        return (self.scale * x + offx, -self.scale * y + offy)

    def win_to_proj(self, x, y):
        """\
        Return the point in projected coordinates given by window coords x y
        """
        offx, offy = self.offset
        return ((x - offx) / self.scale, (offy - y) / self.scale)

    def FitRectToWindow(self, rect):
        width, height = self.GetSizeTuple()
        llx, lly, urx, ury = rect
        if llx == urx or lly == ury:
            # zero with or zero height. Do Nothing
            return
        scalex = width / (urx - llx)
        scaley = height / (ury - lly)
        scale = min(scalex, scaley)
        offx = 0.5 * (width - (urx + llx) * scale)
        offy = 0.5 * (height + (ury + lly) * scale)
        self.set_view_transform(scale, (offx, offy))

    def FitMapToWindow(self):
        """\
        Set the scale and offset so that the map is centered in the
        window
        """
        bbox = self.map.ProjectedBoundingBox()
        if bbox is not None:
            self.FitRectToWindow(bbox)

    def ZoomFactor(self, factor, center = None):
        """Multiply the zoom by factor and center on center.

        The optional parameter center is a point in window coordinates
        that should be centered. If it is omitted, it defaults to the
        center of the window
        """
        width, height = self.GetSizeTuple()
        scale = self.scale * factor
        offx, offy = self.offset
        if center is not None:
            cx, cy = center
        else:
            cx = width / 2
            cy = height / 2
        offset = (factor * (offx - cx) + width / 2,
                  factor * (offy - cy) + height / 2)
        self.set_view_transform(scale, offset)

    def ZoomOutToRect(self, rect):
        # rect is given in window coordinates

        # determine the bbox of the displayed region in projected
        # coordinates
        width, height = self.GetSizeTuple()
        llx, lly = self.win_to_proj(0, height - 1)
        urx, ury = self.win_to_proj(width - 1, 0)

        sx, sy, ex, ey = rect
        scalex = (ex - sx) / (urx - llx)
        scaley = (ey - sy) / (ury - lly)
        scale = min(scalex, scaley)

        offx = 0.5 * ((ex + sx) - (urx + llx) * scale)
        offy = 0.5 * ((ey + sy) + (ury + lly) * scale)
        self.set_view_transform(scale, (offx, offy))

    def Translate(self, dx, dy):
        offx, offy = self.offset
        self.set_view_transform(self.scale, (offx + dx, offy + dy))

    def ZoomInTool(self):
        self.tool = ZoomInTool(self)

    def ZoomOutTool(self):
        self.tool = ZoomOutTool(self)

    def PanTool(self):
        self.tool = PanTool(self)

    def IdentifyTool(self):
        self.tool = IdentifyTool(self)

    def LabelTool(self):
        self.tool = LabelTool(self)

    def CurrentTool(self):
        return self.tool and self.tool.Name() or None

    def CurrentPosition(self):
        """Return current position of the mouse in projected coordinates.

        The result is a 2-tuple of floats with the coordinates. If the
        mouse is not in the window, the result is None.
        """
        if self.current_position is not None:
            x, y = self.current_position
            return self.win_to_proj(x, y)
        else:
            return None

    def set_current_position(self, event):
        """Set the current position from event

        Should be called by all events that contain mouse positions
        especially EVT_MOTION. The event paramete may be None to
        indicate the the pointer left the window.
        """
        if event is not None:
            self.current_position = (event.m_x, event.m_y)
        else:
            self.current_position = None
        self.issue(VIEW_POSITION)

    def OnLeftDown(self, event):
        self.set_current_position(event)
        if self.tool is not None:
            self.drag_dc = wxClientDC(self)
            self.drag_dc.SetLogicalFunction(wxINVERT)
            self.drag_dc.SetBrush(wxTRANSPARENT_BRUSH)
            self.CaptureMouse()
            self.tool.MouseDown(event)
            self.tool.Show(self.drag_dc)
            self.dragging = 1
        
    def OnLeftUp(self, event):
        self.ReleaseMouse()
        self.set_current_position(event)
        if self.dragging:
            self.tool.Hide(self.drag_dc)
            self.tool.MouseUp(event)
            self.drag_dc = None
        self.dragging = 0

    def OnMotion(self, event):
        self.set_current_position(event)
        if self.dragging:
            self.tool.Hide(self.drag_dc)
            self.tool.MouseMove(event)
            self.tool.Show(self.drag_dc)

    def OnLeaveWindow(self, event):
        self.set_current_position(None)

    def OnIdle(self, event):
        if self.redraw_on_idle:
            self.do_redraw()
        self.redraw_on_idle = 0

    def OnSize(self, event):
        # the window's size has changed. We have to get a new bitmap. If
        # we want to be clever we could try to get by without throwing
        # everything away. E.g. when the window gets smaller, we could
        # either keep the bitmap or create the new one from the old one.
        # Even when the window becomes larger some parts of the bitmap
        # could be reused.
        self.full_redraw()

    def shape_selected(self, layer, shape):
        self.full_redraw()

    def find_shape_at(self, px, py, select_labels = 0, selected_layer = 1):
        """Determine the shape at point px, py in window coords

        Return the shape and the corresponding layer as a tuple (layer,
        shape).

        If the optional parameter select_labels is true (default false)
        search through the labels. If a label is found return it's index
        as the shape and None as the layer.

        If the optional parameter selected_layer is true (default), only
        search in the currently selected layer.
        """
        map_proj = self.map.projection
        if map_proj is not None:
            forward = map_proj.Forward
        else:
            forward = None

        scale = self.scale
        offx, offy = self.offset

        if select_labels:
            labels = self.map.LabelLayer().Labels()
            
            if labels:
                dc = wxClientDC(self)
                font = wxFont(10, wx.wxSWISS, wx.wxNORMAL, wx.wxNORMAL)
                dc.SetFont(font)
                for i in range(len(labels) - 1, -1, -1):
                    label = labels[i]
                    x = label.x
                    y = label.y
                    text = label.text
                    if forward:
                        x, y = forward(x, y)
                    x = x * scale + offx
                    y = -y * scale + offy
                    width, height = dc.GetTextExtent(text)
                    if label.halign == ALIGN_LEFT:
                        # nothing to be done
                        pass
                    elif label.halign == ALIGN_RIGHT:
                        x = x - width
                    elif label.halign == ALIGN_CENTER:
                        x = x - width/2
                    if label.valign == ALIGN_TOP:
                        # nothing to be done
                        pass
                    elif label.valign == ALIGN_BOTTOM:
                        y = y - height
                    elif label.valign == ALIGN_CENTER:
                        y = y - height/2
                    if x <= px < x + width and y <= py <= y + height:
                        return None, i

        if selected_layer:
            layer = self.interactor.SelectedLayer()
            if layer is not None:
                layers = [layer]
            else:
                # no layer selected. Use an empty list to effectively
                # ignore all layers.
                layers = []
        else:
            layers = self.map.Layers()

        for layer_index in range(len(layers) - 1, -1, -1):
            layer = layers[layer_index]

            # search only in visible layers
            if not layer.Visible():
                continue

            filled = layer.fill is not None
            stroked = layer.stroke is not None
                
            layer_proj = layer.projection
            if layer_proj is not None:
                inverse = layer_proj.Inverse
            else:
                inverse = None
                
            shapetype = layer.ShapeType()

            select_shape = -1
            if shapetype == SHAPETYPE_POLYGON:
                for i in range(layer.NumShapes() - 1, -1, -1):
                    result = point_in_polygon_shape(layer.shapefile.cobject(),
                                                    i,
                                                    filled, stroked,
                                                    map_proj, layer_proj,
                                                    scale, -scale, offx, offy,
                                                    px, py)
                    if result:
                        select_shape = i
                        break
            elif shapetype == SHAPETYPE_ARC:
                for i in range(layer.NumShapes() - 1, -1, -1):
                    result = point_in_polygon_shape(layer.shapefile.cobject(),
                                                    i, 0, 1,
                                                    map_proj, layer_proj,
                                                    scale, -scale, offx, offy,
                                                    px, py)
                    if result < 0:
                        select_shape = i
                        break
            elif shapetype == SHAPETYPE_POINT:
                for i in range(layer.NumShapes() - 1, -1, -1):
                    shape = layer.Shape(i)
                    x, y = shape.Points()[0]
                    if inverse:
                        x, y = inverse(x, y)
                    if forward:
                        x, y = forward(x, y)
                    x = x * scale + offx
                    y = -y * scale + offy
                    if hypot(px - x, py - y) < 5:
                        select_shape = i
                        break

            if select_shape >= 0:
                return layer, select_shape
        return None, None

    def SelectShapeAt(self, x, y):
        layer, shape = self.find_shape_at(x, y, selected_layer = 0)
        # If layer is None, then shape will also be None. We don't want
        # to deselect the currently selected layer, so we simply select
        # the already selected layer again.
        if layer is None:
            layer = self.interactor.SelectedLayer()
        self.interactor.SelectLayerAndShape(layer, shape)

    def LabelShapeAt(self, x, y):
        ox = x; oy = y
        label_layer = self.map.LabelLayer()
        layer, shape_index = self.find_shape_at(x, y, select_labels = 1)
        if layer is None and shape_index is not None:
            # a label was selected
            label_layer.RemoveLabel(shape_index)
        elif layer is not None:
            text = labeldialog.run_label_dialog(self, layer.table, shape_index)
            if text:
                proj = self.map.projection
                if proj is not None:
                    map_proj = proj
                else:
                    map_proj = None
                proj = layer.projection
                if proj is not None:
                    layer_proj = proj
                else:
                    layer_proj = None

                shapetype = layer.ShapeType()
                if shapetype == SHAPETYPE_POLYGON:
                    x, y = shape_centroid(layer.shapefile.cobject(),
                                          shape_index,
                                          map_proj, layer_proj, 1, 1, 0, 0)
                    if map_proj is not None:
                        x, y = map_proj.Inverse(x, y)
                else:
                    shape = layer.Shape(shape_index)
                    if shapetype == SHAPETYPE_POINT:
                        x, y = shape.Points()[0]
                    else:
                        # assume SHAPETYPE_ARC
                        points = shape.Points()
                        x, y = points[len(points) / 2]
                    if layer_proj is not None:
                        x, y = layer_proj.Inverse(x, y)
                if shapetype == SHAPETYPE_POINT:
                    halign = ALIGN_LEFT
                    valign = ALIGN_CENTER
                elif shapetype == SHAPETYPE_POLYGON:
                    halign = ALIGN_CENTER
                    valign = ALIGN_CENTER
                elif shapetype == SHAPETYPE_ARC:
                    halign = ALIGN_LEFT
                    valign = ALIGN_CENTER
                label_layer.AddLabel(x, y, text,
                                     halign = halign, valign = valign)
1	# Copyright (c) 2001, 2002 by Intevation GmbH
2	# Authors:
3	# Bernhard Herzog <[email protected]>
4	#
5	# This program is free software under the GPL (>=v2)
6	# Read the file COPYING coming with Thuban for details.
7
8	"""
9	Classes for display of a map and interaction with it
10	"""
11
12	__version__ = "$Revision$"
13
14	from math import hypot
15
16	from wxPython.wx import wxWindow,\
17	wxPaintDC, wxColour, wxClientDC, wxINVERT, wxTRANSPARENT_BRUSH, wxFont,\
18	EVT_PAINT, EVT_LEFT_DOWN, EVT_LEFT_UP, EVT_MOTION, EVT_LEAVE_WINDOW
19
20
21	from wxPython import wx
22
23	from wxproj import point_in_polygon_shape, shape_centroid
24
25
26	from Thuban.Model.messages import MAP_PROJECTION_CHANGED, \
27	LAYERS_CHANGED, LAYER_LEGEND_CHANGED, LAYER_VISIBILITY_CHANGED
28	from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \
29	SHAPETYPE_POINT
30	from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \
31	ALIGN_LEFT, ALIGN_RIGHT
32	from Thuban.Lib.connector import Publisher
33
34	from renderer import ScreenRenderer, PrinterRender
35
36	import labeldialog
37
38	from messages import SELECTED_SHAPE, VIEW_POSITION
39
40
41	#
42	# The tools
43	#
44
45	class Tool:
46
47	"""
48	Base class for the interactive tools
49	"""
50
51	def __init__(self, view):
52	"""Intitialize the tool. The view is the canvas displaying the map"""
53	self.view = view
54	self.start = self.current = None
55	self.dragging = 0
56	self.drawn = 0
57
58	def Name(self):
59	"""Return the tool's name"""
60	return ''
61
62	def drag_start(self, x, y):
63	self.start = self.current = x, y
64	self.dragging = 1
65
66	def drag_move(self, x, y):
67	self.current = x, y
68
69	def drag_stop(self, x, y):
70	self.current = x, y
71	self.dragging = 0
72
73	def Show(self, dc):
74	if not self.drawn:
75	self.draw(dc)
76	self.drawn = 1
77
78	def Hide(self, dc):
79	if self.drawn:
80	self.draw(dc)
81	self.drawn = 0
82
83	def draw(self, dc):
84	pass
85
86	def MouseDown(self, event):
87	self.drag_start(event.m_x, event.m_y)
88
89	def MouseMove(self, event):
90	if self.dragging:
91	self.drag_move(event.m_x, event.m_y)
92
93	def MouseUp(self, event):
94	if self.dragging:
95	self.drag_move(event.m_x, event.m_y)
96
97	def Cancel(self):
98	self.dragging = 0
99
100
101	class RectTool(Tool):
102
103	"""Base class for tools that draw rectangles while dragging"""
104
105	def draw(self, dc):
106	sx, sy = self.start
107	cx, cy = self.current
108	dc.DrawRectangle(sx, sy, cx - sx, cy - sy)
109
110	class ZoomInTool(RectTool):
111
112	"""The Zoom-In Tool"""
113
114	def Name(self):
115	return "ZoomInTool"
116
117	def proj_rect(self):
118	"""return the rectangle given by start and current in projected
119	coordinates"""
120	sx, sy = self.start
121	cx, cy = self.current
122	left, top = self.view.win_to_proj(sx, sy)
123	right, bottom = self.view.win_to_proj(cx, cy)
124	return (min(left, right), min(top, bottom),
125	max(left, right), max(top, bottom))
126
127	def MouseUp(self, event):
128	if self.dragging:
129	Tool.MouseUp(self, event)
130	sx, sy = self.start
131	cx, cy = self.current
132	if sx == cx and sy == cy:
133	# Just a mouse click. Simply zoom in by a factor of two
134	self.view.ZoomFactor(2, center = (cx, cy))
135	else:
136	# A drag. Zoom in to the rectangle
137	self.view.FitRectToWindow(self.proj_rect())
138
139
140	class ZoomOutTool(RectTool):
141
142	"""The Zoom-Out Tool"""
143
144	def Name(self):
145	return "ZoomOutTool"
146
147	def MouseUp(self, event):
148	if self.dragging:
149	Tool.MouseUp(self, event)
150	sx, sy = self.start
151	cx, cy = self.current
152	if sx == cx and sy == cy:
153	# Just a mouse click. Simply zoom out by a factor of two
154	self.view.ZoomFactor(0.5, center = (cy, cy))
155	else:
156	# A drag. Zoom out to the rectangle
157	self.view.ZoomOutToRect((min(sx, cx), min(sy, cy),
158	max(sx, cx), max(sy, cy)))
159
160
161	class PanTool(Tool):
162
163	"""The Pan Tool"""
164
165	def Name(self):
166	return "PanTool"
167
168	def MouseMove(self, event):
169	if self.dragging:
170	x0, y0 = self.current
171	Tool.MouseMove(self, event)
172	x, y = self.current
173	width, height = self.view.GetSizeTuple()
174	dc = self.view.drag_dc
175	dc.Blit(0, 0, width, height, dc, x0 - x, y0 - y)
176
177	def MouseUp(self, event):
178	if self.dragging:
179	Tool.MouseUp(self, event)
180	sx, sy = self.start
181	cx, cy = self.current
182	self.view.Translate(cx - sx, cy - sy)
183
184	class IdentifyTool(Tool):
185
186	"""The "Identify" Tool"""
187
188	def Name(self):
189	return "IdentifyTool"
190
191	def MouseUp(self, event):
192	self.view.SelectShapeAt(event.m_x, event.m_y)
193
194
195	class LabelTool(Tool):
196
197	"""The "Label" Tool"""
198
199	def Name(self):
200	return "LabelTool"
201
202	def MouseUp(self, event):
203	self.view.LabelShapeAt(event.m_x, event.m_y)
204
205
206
207
208	class MapPrintout(wx.wxPrintout):
209
210	"""
211	wxPrintout class for printing Thuban maps
212	"""
213
214	def __init__(self, map):
215	wx.wxPrintout.__init__(self)
216	self.map = map
217
218	def GetPageInfo(self):
219	return (1, 1, 1, 1)
220
221	def HasPage(self, pagenum):
222	return pagenum == 1
223
224	def OnPrintPage(self, pagenum):
225	if pagenum == 1:
226	self.draw_on_dc(self.GetDC())
227
228	def draw_on_dc(self, dc):
229	width, height = self.GetPageSizePixels()
230	llx, lly, urx, ury = self.map.ProjectedBoundingBox()
231	scalex = width / (urx - llx)
232	scaley = height / (ury - lly)
233	scale = min(scalex, scaley)
234	offx = 0.5 * (width - (urx + llx) * scale)
235	offy = 0.5 * (height + (ury + lly) * scale)
236
237	resx, resy = self.GetPPIPrinter()
238	renderer = PrinterRender(dc, scale, (offx, offy), resolution = resx)
239	renderer.RenderMap(self.map)
240	return wx.true
241
242
243	class MapCanvas(wxWindow, Publisher):
244
245	"""A widget that displays a map and offers some interaction"""
246
247	def __init__(self, parent, winid, interactor):
248	wxWindow.__init__(self, parent, winid)
249	self.SetBackgroundColour(wxColour(255, 255, 255))
250
251	# the map displayed in this canvas. Set with SetMap()
252	self.map = None
253
254	# scale and offset describe the transformation from projected
255	# coordinates to window coordinates.
256	self.scale = 1.0
257	self.offset = (0, 0)
258
259	# whether the user is currently dragging the mouse, i.e. moving
260	# the mouse while pressing a mouse button
261	self.dragging = 0
262
263	# the currently active tool
264	self.tool = None
265
266	# The current mouse position of the last OnMotion event or None
267	# if the mouse is outside the window.
268	self.current_position = None
269
270
271	# If true, OnIdle will call do_redraw to do the actual
272	# redrawing. Set by OnPaint to avoid some unnecessary redraws.
273	# To force a redraw call full_redraw().
274	self.redraw_on_idle = 0
275
276	# the bitmap serving as backing store
277	self.bitmap = None
278
279	# the interactor
280	self.interactor = interactor
281	self.interactor.Subscribe(SELECTED_SHAPE, self.shape_selected)
282
283	# subscribe the WX events we're interested in
284	EVT_PAINT(self, self.OnPaint)
285	EVT_LEFT_DOWN(self, self.OnLeftDown)
286	EVT_LEFT_UP(self, self.OnLeftUp)
287	EVT_MOTION(self, self.OnMotion)
288	EVT_LEAVE_WINDOW(self, self.OnLeaveWindow)
289	wx.EVT_SIZE(self, self.OnSize)
290	wx.EVT_IDLE(self, self.OnIdle)
291
292	def __del__(self):
293	wxWindow.__del__(self)
294	Publisher.__del__(self)
295
296	def OnPaint(self, event):
297	dc = wxPaintDC(self)
298	if self.map is not None and self.map.HasLayers():
299	# We have a non-empty map. Redraw it in idle time
300	self.redraw_on_idle = 1
301	else:
302	# If we've got no map or if the map is empty, simply clear
303	# the screen.
304
305	# XXX it's probably possible to get rid of this. The
306	# background color of the window is already white and the
307	# only thing we may have to do is to call self.Refresh()
308	# with a true argument in the right places.
309	dc.BeginDrawing()
310	dc.Clear()
311	dc.EndDrawing()
312
313	def do_redraw(self):
314	# This should only be called if we have a non-empty map. We draw
315	# it into a memory DC and then blit it to the screen.
316
317	width, height = self.GetSizeTuple()
318
319	# If self.bitmap's still there, reuse it. Otherwise redraw it
320	if self.bitmap is not None:
321	bitmap = self.bitmap
322	else:
323	bitmap = wx.wxEmptyBitmap(width, height)
324	dc = wx.wxMemoryDC()
325	dc.SelectObject(bitmap)
326	dc.BeginDrawing()
327
328	# clear the background
329	dc.SetBrush(wx.wxWHITE_BRUSH)
330	dc.SetPen(wx.wxTRANSPARENT_PEN)
331	dc.DrawRectangle(0, 0, width, height)
332
333	if 1: #self.interactor.selected_map is self.map:
334	selected_layer = self.interactor.selected_layer
335	selected_shape = self.interactor.selected_shape
336	else:
337	selected_layer = None
338	selected_shape = None
339
340	# draw the map into the bitmap
341	renderer = ScreenRenderer(dc, self.scale, self.offset)
342	renderer.RenderMap(self.map, selected_layer, selected_shape)
343
344	dc.EndDrawing()
345	dc.SelectObject(wx.wxNullBitmap)
346	self.bitmap = bitmap
347
348	# blit the bitmap to the screen
349	dc = wx.wxMemoryDC()
350	dc.SelectObject(bitmap)
351	clientdc = wxClientDC(self)
352	clientdc.BeginDrawing()
353	clientdc.Blit(0, 0, width, height, dc, 0, 0)
354	clientdc.EndDrawing()
355
356	def Print(self):
357	printer = wx.wxPrinter()
358	printout = MapPrintout(self.map)
359	printer.Print(self, printout, wx.true)
360	printout.Destroy()
361
362	def SetMap(self, map):
363	redraw_channels = (LAYERS_CHANGED, LAYER_LEGEND_CHANGED,
364	LAYER_VISIBILITY_CHANGED)
365	if self.map is not None:
366	for channel in redraw_channels:
367	self.map.Unsubscribe(channel, self.full_redraw)
368	self.map.Unsubscribe(MAP_PROJECTION_CHANGED,
369	self.projection_changed)
370	self.map = map
371	if self.map is not None:
372	for channel in redraw_channels:
373	self.map.Subscribe(channel, self.full_redraw)
374	self.map.Subscribe(MAP_PROJECTION_CHANGED, self.projection_changed)
375	self.FitMapToWindow()
376	# force a redraw. If map is not empty, it's already been called
377	# by FitMapToWindow but if map is empty it hasn't been called
378	# yet so we have to explicitly call it.
379	self.full_redraw()
380
381	def Map(self):
382	return self.map
383
384	def redraw(self, *args):
385	self.Refresh(0)
386
387	def full_redraw(self, *args):
388	self.bitmap = None
389	self.redraw()
390
391	def projection_changed(self, *args):
392	self.FitMapToWindow()
393	self.full_redraw()
394
395	def set_view_transform(self, scale, offset):
396	self.scale = scale
397	self.offset = offset
398	self.full_redraw()
399
400	def proj_to_win(self, x, y):
401	"""\
402	Return the point in window coords given by projected coordinates x y
403	"""
404	offx, offy = self.offset
405	return (self.scale * x + offx, -self.scale * y + offy)
406
407	def win_to_proj(self, x, y):
408	"""\
409	Return the point in projected coordinates given by window coords x y
410	"""
411	offx, offy = self.offset
412	return ((x - offx) / self.scale, (offy - y) / self.scale)
413
414	def FitRectToWindow(self, rect):
415	width, height = self.GetSizeTuple()
416	llx, lly, urx, ury = rect
417	if llx == urx or lly == ury:
418	# zero with or zero height. Do Nothing
419	return
420	scalex = width / (urx - llx)
421	scaley = height / (ury - lly)
422	scale = min(scalex, scaley)
423	offx = 0.5 * (width - (urx + llx) * scale)
424	offy = 0.5 * (height + (ury + lly) * scale)
425	self.set_view_transform(scale, (offx, offy))
426
427	def FitMapToWindow(self):
428	"""\
429	Set the scale and offset so that the map is centered in the
430	window
431	"""
432	bbox = self.map.ProjectedBoundingBox()
433	if bbox is not None:
434	self.FitRectToWindow(bbox)
435
436	def ZoomFactor(self, factor, center = None):
437	"""Multiply the zoom by factor and center on center.
438
439	The optional parameter center is a point in window coordinates
440	that should be centered. If it is omitted, it defaults to the
441	center of the window
442	"""
443	width, height = self.GetSizeTuple()
444	scale = self.scale * factor
445	offx, offy = self.offset
446	if center is not None:
447	cx, cy = center
448	else:
449	cx = width / 2
450	cy = height / 2
451	offset = (factor * (offx - cx) + width / 2,
452	factor * (offy - cy) + height / 2)
453	self.set_view_transform(scale, offset)
454
455	def ZoomOutToRect(self, rect):
456	# rect is given in window coordinates
457
458	# determine the bbox of the displayed region in projected
459	# coordinates
460	width, height = self.GetSizeTuple()
461	llx, lly = self.win_to_proj(0, height - 1)
462	urx, ury = self.win_to_proj(width - 1, 0)
463
464	sx, sy, ex, ey = rect
465	scalex = (ex - sx) / (urx - llx)
466	scaley = (ey - sy) / (ury - lly)
467	scale = min(scalex, scaley)
468
469	offx = 0.5 * ((ex + sx) - (urx + llx) * scale)
470	offy = 0.5 * ((ey + sy) + (ury + lly) * scale)
471	self.set_view_transform(scale, (offx, offy))
472
473	def Translate(self, dx, dy):
474	offx, offy = self.offset
475	self.set_view_transform(self.scale, (offx + dx, offy + dy))
476
477	def ZoomInTool(self):
478	self.tool = ZoomInTool(self)
479
480	def ZoomOutTool(self):
481	self.tool = ZoomOutTool(self)
482
483	def PanTool(self):
484	self.tool = PanTool(self)
485
486	def IdentifyTool(self):
487	self.tool = IdentifyTool(self)
488
489	def LabelTool(self):
490	self.tool = LabelTool(self)
491
492	def CurrentTool(self):
493	return self.tool and self.tool.Name() or None
494
495	def CurrentPosition(self):
496	"""Return current position of the mouse in projected coordinates.
497
498	The result is a 2-tuple of floats with the coordinates. If the
499	mouse is not in the window, the result is None.
500	"""
501	if self.current_position is not None:
502	x, y = self.current_position
503	return self.win_to_proj(x, y)
504	else:
505	return None
506
507	def set_current_position(self, event):
508	"""Set the current position from event
509
510	Should be called by all events that contain mouse positions
511	especially EVT_MOTION. The event paramete may be None to
512	indicate the the pointer left the window.
513	"""
514	if event is not None:
515	self.current_position = (event.m_x, event.m_y)
516	else:
517	self.current_position = None
518	self.issue(VIEW_POSITION)
519
520	def OnLeftDown(self, event):
521	self.set_current_position(event)
522	if self.tool is not None:
523	self.drag_dc = wxClientDC(self)
524	self.drag_dc.SetLogicalFunction(wxINVERT)
525	self.drag_dc.SetBrush(wxTRANSPARENT_BRUSH)
526	self.CaptureMouse()
527	self.tool.MouseDown(event)
528	self.tool.Show(self.drag_dc)
529	self.dragging = 1
530
531	def OnLeftUp(self, event):
532	self.ReleaseMouse()
533	self.set_current_position(event)
534	if self.dragging:
535	self.tool.Hide(self.drag_dc)
536	self.tool.MouseUp(event)
537	self.drag_dc = None
538	self.dragging = 0
539
540	def OnMotion(self, event):
541	self.set_current_position(event)
542	if self.dragging:
543	self.tool.Hide(self.drag_dc)
544	self.tool.MouseMove(event)
545	self.tool.Show(self.drag_dc)
546
547	def OnLeaveWindow(self, event):
548	self.set_current_position(None)
549
550	def OnIdle(self, event):
551	if self.redraw_on_idle:
552	self.do_redraw()
553	self.redraw_on_idle = 0
554
555	def OnSize(self, event):
556	# the window's size has changed. We have to get a new bitmap. If
557	# we want to be clever we could try to get by without throwing
558	# everything away. E.g. when the window gets smaller, we could
559	# either keep the bitmap or create the new one from the old one.
560	# Even when the window becomes larger some parts of the bitmap
561	# could be reused.
562	self.full_redraw()
563
564	def shape_selected(self, layer, shape):
565	self.full_redraw()
566
567	def find_shape_at(self, px, py, select_labels = 0, selected_layer = 1):
568	"""Determine the shape at point px, py in window coords
569
570	Return the shape and the corresponding layer as a tuple (layer,
571	shape).
572
573	If the optional parameter select_labels is true (default false)
574	search through the labels. If a label is found return it's index
575	as the shape and None as the layer.
576
577	If the optional parameter selected_layer is true (default), only
578	search in the currently selected layer.
579	"""
580	map_proj = self.map.projection
581	if map_proj is not None:
582	forward = map_proj.Forward
583	else:
584	forward = None
585
586	scale = self.scale
587	offx, offy = self.offset
588
589	if select_labels:
590	labels = self.map.LabelLayer().Labels()
591
592	if labels:
593	dc = wxClientDC(self)
594	font = wxFont(10, wx.wxSWISS, wx.wxNORMAL, wx.wxNORMAL)
595	dc.SetFont(font)
596	for i in range(len(labels) - 1, -1, -1):
597	label = labels[i]
598	x = label.x
599	y = label.y
600	text = label.text
601	if forward:
602	x, y = forward(x, y)
603	x = x * scale + offx
604	y = -y * scale + offy
605	width, height = dc.GetTextExtent(text)
606	if label.halign == ALIGN_LEFT:
607	# nothing to be done
608	pass
609	elif label.halign == ALIGN_RIGHT:
610	x = x - width
611	elif label.halign == ALIGN_CENTER:
612	x = x - width/2
613	if label.valign == ALIGN_TOP:
614	# nothing to be done
615	pass
616	elif label.valign == ALIGN_BOTTOM:
617	y = y - height
618	elif label.valign == ALIGN_CENTER:
619	y = y - height/2
620	if x <= px < x + width and y <= py <= y + height:
621	return None, i
622
623	if selected_layer:
624	layer = self.interactor.SelectedLayer()
625	if layer is not None:
626	layers = [layer]
627	else:
628	# no layer selected. Use an empty list to effectively
629	# ignore all layers.
630	layers = []
631	else:
632	layers = self.map.Layers()
633
634	for layer_index in range(len(layers) - 1, -1, -1):
635	layer = layers[layer_index]
636
637	# search only in visible layers
638	if not layer.Visible():
639	continue
640
641	filled = layer.fill is not None
642	stroked = layer.stroke is not None
643
644	layer_proj = layer.projection
645	if layer_proj is not None:
646	inverse = layer_proj.Inverse
647	else:
648	inverse = None
649
650	shapetype = layer.ShapeType()
651
652	select_shape = -1
653	if shapetype == SHAPETYPE_POLYGON:
654	for i in range(layer.NumShapes() - 1, -1, -1):
655	result = point_in_polygon_shape(layer.shapefile.cobject(),
656	i,
657	filled, stroked,
658	map_proj, layer_proj,
659	scale, -scale, offx, offy,
660	px, py)
661	if result:
662	select_shape = i
663	break
664	elif shapetype == SHAPETYPE_ARC:
665	for i in range(layer.NumShapes() - 1, -1, -1):
666	result = point_in_polygon_shape(layer.shapefile.cobject(),
667	i, 0, 1,
668	map_proj, layer_proj,
669	scale, -scale, offx, offy,
670	px, py)
671	if result < 0:
672	select_shape = i
673	break
674	elif shapetype == SHAPETYPE_POINT:
675	for i in range(layer.NumShapes() - 1, -1, -1):
676	shape = layer.Shape(i)
677	x, y = shape.Points()[0]
678	if inverse:
679	x, y = inverse(x, y)
680	if forward:
681	x, y = forward(x, y)
682	x = x * scale + offx
683	y = -y * scale + offy
684	if hypot(px - x, py - y) < 5:
685	select_shape = i
686	break
687
688	if select_shape >= 0:
689	return layer, select_shape
690	return None, None
691
692	def SelectShapeAt(self, x, y):
693	layer, shape = self.find_shape_at(x, y, selected_layer = 0)
694	# If layer is None, then shape will also be None. We don't want
695	# to deselect the currently selected layer, so we simply select
696	# the already selected layer again.
697	if layer is None:
698	layer = self.interactor.SelectedLayer()
699	self.interactor.SelectLayerAndShape(layer, shape)
700
701	def LabelShapeAt(self, x, y):
702	ox = x; oy = y
703	label_layer = self.map.LabelLayer()
704	layer, shape_index = self.find_shape_at(x, y, select_labels = 1)
705	if layer is None and shape_index is not None:
706	# a label was selected
707	label_layer.RemoveLabel(shape_index)
708	elif layer is not None:
709	text = labeldialog.run_label_dialog(self, layer.table, shape_index)
710	if text:
711	proj = self.map.projection
712	if proj is not None:
713	map_proj = proj
714	else:
715	map_proj = None
716	proj = layer.projection
717	if proj is not None:
718	layer_proj = proj
719	else:
720	layer_proj = None
721
722	shapetype = layer.ShapeType()
723	if shapetype == SHAPETYPE_POLYGON:
724	x, y = shape_centroid(layer.shapefile.cobject(),
725	shape_index,
726	map_proj, layer_proj, 1, 1, 0, 0)
727	if map_proj is not None:
728	x, y = map_proj.Inverse(x, y)
729	else:
730	shape = layer.Shape(shape_index)
731	if shapetype == SHAPETYPE_POINT:
732	x, y = shape.Points()[0]
733	else:
734	# assume SHAPETYPE_ARC
735	points = shape.Points()
736	x, y = points[len(points) / 2]
737	if layer_proj is not None:
738	x, y = layer_proj.Inverse(x, y)
739	if shapetype == SHAPETYPE_POINT:
740	halign = ALIGN_LEFT
741	valign = ALIGN_CENTER
742	elif shapetype == SHAPETYPE_POLYGON:
743	halign = ALIGN_CENTER
744	valign = ALIGN_CENTER
745	elif shapetype == SHAPETYPE_ARC:
746	halign = ALIGN_LEFT
747	valign = ALIGN_CENTER
748	label_layer.AddLabel(x, y, text,
749	halign = halign, valign = valign)
Name	Value
svn:eol-style	native
svn:keywords	Author Date Id Revision