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


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 renderer import ScreenRenderer, PrinterRender

import labeldialog

from messages import SELECTED_SHAPE


#
#   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):

    """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))
        self.map = None
        self.scale = 1.0
        self.offset = (0, 0)
        self.dragging = 0
        self.tool = None
        self.redraw_on_idle = 0
        EVT_PAINT(self, self.OnPaint)
        EVT_LEFT_DOWN(self, self.OnLeftDown)
        EVT_LEFT_UP(self, self.OnLeftUp)
        EVT_MOTION(self, self.OnMotion)
        wx.EVT_IDLE(self, self.OnIdle)
        self.interactor = interactor
        self.interactor.Subscribe(SELECTED_SHAPE, self.shape_selected)

    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()
        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()

        # blit the bitmap to the screen
        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.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.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.redraw()

    def Map(self):
        return self.map

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

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

    def set_view_transform(self, scale, offset):
        self.scale = scale
        self.offset = offset
        self.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 OnLeftDown(self, 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()
        if self.dragging:
            self.tool.Hide(self.drag_dc)
            self.tool.MouseUp(event)
            self.drag_dc = None
        self.dragging = 0

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

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

    def shape_selected(self, layer, shape):
        self.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
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
33
34	from renderer import ScreenRenderer, PrinterRender
35
36	import labeldialog
37
38	from messages import SELECTED_SHAPE
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):
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	self.map = None
251	self.scale = 1.0
252	self.offset = (0, 0)
253	self.dragging = 0
254	self.tool = None
255	self.redraw_on_idle = 0
256	EVT_PAINT(self, self.OnPaint)
257	EVT_LEFT_DOWN(self, self.OnLeftDown)
258	EVT_LEFT_UP(self, self.OnLeftUp)
259	EVT_MOTION(self, self.OnMotion)
260	wx.EVT_IDLE(self, self.OnIdle)
261	self.interactor = interactor
262	self.interactor.Subscribe(SELECTED_SHAPE, self.shape_selected)
263
264	def OnPaint(self, event):
265	dc = wxPaintDC(self)
266	if self.map is not None and self.map.HasLayers():
267	# We have a non-empty map. Redraw it in idle time
268	self.redraw_on_idle = 1
269	else:
270	# If we've got no map or if the map is empty, simply clear
271	# the screen.
272
273	# XXX it's probably possible to get rid of this. The
274	# background color of the window is already white and the
275	# only thing we may have to do is to call self.Refresh()
276	# with a true argument in the right places.
277	dc.BeginDrawing()
278	dc.Clear()
279	dc.EndDrawing()
280
281	def do_redraw(self):
282	# This should only be called if we have a non-empty map. We draw
283	# it into a memory DC and then blit it to the screen.
284	width, height = self.GetSizeTuple()
285	bitmap = wx.wxEmptyBitmap(width, height)
286	dc = wx.wxMemoryDC()
287	dc.SelectObject(bitmap)
288	dc.BeginDrawing()
289
290	# clear the background
291	dc.SetBrush(wx.wxWHITE_BRUSH)
292	dc.SetPen(wx.wxTRANSPARENT_PEN)
293	dc.DrawRectangle(0, 0, width, height)
294
295	if 1: #self.interactor.selected_map is self.map:
296	selected_layer = self.interactor.selected_layer
297	selected_shape = self.interactor.selected_shape
298	else:
299	selected_layer = None
300	selected_shape = None
301
302	# draw the map into the bitmap
303	renderer = ScreenRenderer(dc, self.scale, self.offset)
304	renderer.RenderMap(self.map, selected_layer, selected_shape)
305
306	dc.EndDrawing()
307
308	# blit the bitmap to the screen
309	clientdc = wxClientDC(self)
310	clientdc.BeginDrawing()
311	clientdc.Blit(0, 0, width, height, dc, 0, 0)
312	clientdc.EndDrawing()
313
314	def Print(self):
315	printer = wx.wxPrinter()
316	printout = MapPrintout(self.map)
317	printer.Print(self, printout, wx.true)
318	printout.Destroy()
319
320	def SetMap(self, map):
321	redraw_channels = (LAYERS_CHANGED, LAYER_LEGEND_CHANGED,
322	LAYER_VISIBILITY_CHANGED)
323	if self.map is not None:
324	for channel in redraw_channels:
325	self.map.Unsubscribe(channel, self.redraw)
326	self.map.Unsubscribe(MAP_PROJECTION_CHANGED,
327	self.projection_changed)
328	self.map = map
329	if self.map is not None:
330	for channel in redraw_channels:
331	self.map.Subscribe(channel, self.redraw)
332	self.map.Subscribe(MAP_PROJECTION_CHANGED, self.projection_changed)
333	self.FitMapToWindow()
334	# force a redraw. If map is not empty, it's already been called
335	# by FitMapToWindow but if map is empty it hasn't been called
336	# yet so we have to explicitly call it.
337	self.redraw()
338
339	def Map(self):
340	return self.map
341
342	def redraw(self, *args):
343	self.Refresh(0)
344
345	def projection_changed(self, *args):
346	self.FitMapToWindow()
347	self.redraw()
348
349	def set_view_transform(self, scale, offset):
350	self.scale = scale
351	self.offset = offset
352	self.redraw()
353
354	def proj_to_win(self, x, y):
355	"""\
356	Return the point in window coords given by projected coordinates x y
357	"""
358	offx, offy = self.offset
359	return (self.scale * x + offx, -self.scale * y + offy)
360
361	def win_to_proj(self, x, y):
362	"""\
363	Return the point in projected coordinates given by window coords x y
364	"""
365	offx, offy = self.offset
366	return ((x - offx) / self.scale, (offy - y) / self.scale)
367
368	def FitRectToWindow(self, rect):
369	width, height = self.GetSizeTuple()
370	llx, lly, urx, ury = rect
371	if llx == urx or lly == ury:
372	# zero with or zero height. Do Nothing
373	return
374	scalex = width / (urx - llx)
375	scaley = height / (ury - lly)
376	scale = min(scalex, scaley)
377	offx = 0.5 * (width - (urx + llx) * scale)
378	offy = 0.5 * (height + (ury + lly) * scale)
379	self.set_view_transform(scale, (offx, offy))
380
381	def FitMapToWindow(self):
382	"""\
383	Set the scale and offset so that the map is centered in the
384	window
385	"""
386	bbox = self.map.ProjectedBoundingBox()
387	if bbox is not None:
388	self.FitRectToWindow(bbox)
389
390	def ZoomFactor(self, factor, center = None):
391	"""Multiply the zoom by factor and center on center.
392
393	The optional parameter center is a point in window coordinates
394	that should be centered. If it is omitted, it defaults to the
395	center of the window
396	"""
397	width, height = self.GetSizeTuple()
398	scale = self.scale * factor
399	offx, offy = self.offset
400	if center is not None:
401	cx, cy = center
402	else:
403	cx = width / 2
404	cy = height / 2
405	offset = (factor * (offx - cx) + width / 2,
406	factor * (offy - cy) + height / 2)
407	self.set_view_transform(scale, offset)
408
409	def ZoomOutToRect(self, rect):
410	# rect is given in window coordinates
411
412	# determine the bbox of the displayed region in projected
413	# coordinates
414	width, height = self.GetSizeTuple()
415	llx, lly = self.win_to_proj(0, height - 1)
416	urx, ury = self.win_to_proj(width - 1, 0)
417
418	sx, sy, ex, ey = rect
419	scalex = (ex - sx) / (urx - llx)
420	scaley = (ey - sy) / (ury - lly)
421	scale = min(scalex, scaley)
422
423	offx = 0.5 * ((ex + sx) - (urx + llx) * scale)
424	offy = 0.5 * ((ey + sy) + (ury + lly) * scale)
425	self.set_view_transform(scale, (offx, offy))
426
427	def Translate(self, dx, dy):
428	offx, offy = self.offset
429	self.set_view_transform(self.scale, (offx + dx, offy + dy))
430
431	def ZoomInTool(self):
432	self.tool = ZoomInTool(self)
433
434	def ZoomOutTool(self):
435	self.tool = ZoomOutTool(self)
436
437	def PanTool(self):
438	self.tool = PanTool(self)
439
440	def IdentifyTool(self):
441	self.tool = IdentifyTool(self)
442
443	def LabelTool(self):
444	self.tool = LabelTool(self)
445
446	def CurrentTool(self):
447	return self.tool and self.tool.Name() or None
448
449	def OnLeftDown(self, event):
450	if self.tool is not None:
451	self.drag_dc = wxClientDC(self)
452	self.drag_dc.SetLogicalFunction(wxINVERT)
453	self.drag_dc.SetBrush(wxTRANSPARENT_BRUSH)
454	self.CaptureMouse()
455	self.tool.MouseDown(event)
456	self.tool.Show(self.drag_dc)
457	self.dragging = 1
458
459	def OnLeftUp(self, event):
460	self.ReleaseMouse()
461	if self.dragging:
462	self.tool.Hide(self.drag_dc)
463	self.tool.MouseUp(event)
464	self.drag_dc = None
465	self.dragging = 0
466
467	def OnMotion(self, event):
468	if self.dragging:
469	self.tool.Hide(self.drag_dc)
470	self.tool.MouseMove(event)
471	self.tool.Show(self.drag_dc)
472
473	def OnIdle(self, event):
474	if self.redraw_on_idle:
475	self.do_redraw()
476	self.redraw_on_idle = 0
477
478	def shape_selected(self, layer, shape):
479	self.redraw()
480
481	def find_shape_at(self, px, py, select_labels = 0, selected_layer = 1):
482	"""Determine the shape at point px, py in window coords
483
484	Return the shape and the corresponding layer as a tuple (layer,
485	shape).
486
487	If the optional parameter select_labels is true (default false)
488	search through the labels. If a label is found return it's index
489	as the shape and None as the layer.
490
491	If the optional parameter selected_layer is true (default), only
492	search in the currently selected layer.
493	"""
494	map_proj = self.map.projection
495	if map_proj is not None:
496	forward = map_proj.Forward
497	else:
498	forward = None
499
500	scale = self.scale
501	offx, offy = self.offset
502
503	if select_labels:
504	labels = self.map.LabelLayer().Labels()
505
506	if labels:
507	dc = wxClientDC(self)
508	font = wxFont(10, wx.wxSWISS, wx.wxNORMAL, wx.wxNORMAL)
509	dc.SetFont(font)
510	for i in range(len(labels) - 1, -1, -1):
511	label = labels[i]
512	x = label.x
513	y = label.y
514	text = label.text
515	if forward:
516	x, y = forward(x, y)
517	x = x * scale + offx
518	y = -y * scale + offy
519	width, height = dc.GetTextExtent(text)
520	if label.halign == ALIGN_LEFT:
521	# nothing to be done
522	pass
523	elif label.halign == ALIGN_RIGHT:
524	x = x - width
525	elif label.halign == ALIGN_CENTER:
526	x = x - width/2
527	if label.valign == ALIGN_TOP:
528	# nothing to be done
529	pass
530	elif label.valign == ALIGN_BOTTOM:
531	y = y - height
532	elif label.valign == ALIGN_CENTER:
533	y = y - height/2
534	if x <= px < x + width and y <= py <= y + height:
535	return None, i
536
537	if selected_layer:
538	layer = self.interactor.SelectedLayer()
539	if layer is not None:
540	layers = [layer]
541	else:
542	# no layer selected. Use an empty list to effectively
543	# ignore all layers.
544	layers = []
545	else:
546	layers = self.map.Layers()
547
548	for layer_index in range(len(layers) - 1, -1, -1):
549	layer = layers[layer_index]
550
551	# search only in visible layers
552	if not layer.Visible():
553	continue
554
555	filled = layer.fill is not None
556	stroked = layer.stroke is not None
557
558	layer_proj = layer.projection
559	if layer_proj is not None:
560	inverse = layer_proj.Inverse
561	else:
562	inverse = None
563
564	shapetype = layer.ShapeType()
565
566	select_shape = -1
567	if shapetype == SHAPETYPE_POLYGON:
568	for i in range(layer.NumShapes() - 1, -1, -1):
569	result = point_in_polygon_shape(layer.shapefile.cobject(),
570	i,
571	filled, stroked,
572	map_proj, layer_proj,
573	scale, -scale, offx, offy,
574	px, py)
575	if result:
576	select_shape = i
577	break
578	elif shapetype == SHAPETYPE_ARC:
579	for i in range(layer.NumShapes() - 1, -1, -1):
580	result = point_in_polygon_shape(layer.shapefile.cobject(),
581	i, 0, 1,
582	map_proj, layer_proj,
583	scale, -scale, offx, offy,
584	px, py)
585	if result < 0:
586	select_shape = i
587	break
588	elif shapetype == SHAPETYPE_POINT:
589	for i in range(layer.NumShapes() - 1, -1, -1):
590	shape = layer.Shape(i)
591	x, y = shape.Points()[0]
592	if inverse:
593	x, y = inverse(x, y)
594	if forward:
595	x, y = forward(x, y)
596	x = x * scale + offx
597	y = -y * scale + offy
598	if hypot(px - x, py - y) < 5:
599	select_shape = i
600	break
601
602	if select_shape >= 0:
603	return layer, select_shape
604	return None, None
605
606	def SelectShapeAt(self, x, y):
607	layer, shape = self.find_shape_at(x, y, selected_layer = 0)
608	# If layer is None, then shape will also be None. We don't want
609	# to deselect the currently selected layer, so we simply select
610	# the already selected layer again.
611	if layer is None:
612	layer = self.interactor.SelectedLayer()
613	self.interactor.SelectLayerAndShape(layer, shape)
614
615	def LabelShapeAt(self, x, y):
616	ox = x; oy = y
617	label_layer = self.map.LabelLayer()
618	layer, shape_index = self.find_shape_at(x, y, select_labels = 1)
619	if layer is None and shape_index is not None:
620	# a label was selected
621	label_layer.RemoveLabel(shape_index)
622	elif layer is not None:
623	text = labeldialog.run_label_dialog(self, layer.table, shape_index)
624	if text:
625	proj = self.map.projection
626	if proj is not None:
627	map_proj = proj
628	else:
629	map_proj = None
630	proj = layer.projection
631	if proj is not None:
632	layer_proj = proj
633	else:
634	layer_proj = None
635
636	shapetype = layer.ShapeType()
637	if shapetype == SHAPETYPE_POLYGON:
638	x, y = shape_centroid(layer.shapefile.cobject(),
639	shape_index,
640	map_proj, layer_proj, 1, 1, 0, 0)
641	if map_proj is not None:
642	x, y = map_proj.Inverse(x, y)
643	else:
644	shape = layer.Shape(shape_index)
645	if shapetype == SHAPETYPE_POINT:
646	x, y = shape.Points()[0]
647	else:
648	# assume SHAPETYPE_ARC
649	points = shape.Points()
650	x, y = points[len(points) / 2]
651	if layer_proj is not None:
652	x, y = layer_proj.Inverse(x, y)
653	if shapetype == SHAPETYPE_POINT:
654	halign = ALIGN_LEFT
655	valign = ALIGN_CENTER
656	elif shapetype == SHAPETYPE_POLYGON:
657	halign = ALIGN_CENTER
658	valign = ALIGN_CENTER
659	elif shapetype == SHAPETYPE_ARC:
660	halign = ALIGN_LEFT
661	valign = ALIGN_CENTER
662	label_layer.AddLabel(x, y, text,
663	halign = halign, valign = valign)
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svn:keywords	Author Date Id Revision