Thuban/UI/view.py

# Copyright (c) 2001 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)
            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
            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):
        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)
        import main
        self.interactor = main.app.interactor
        self.interactor.Subscribe(SELECTED_SHAPE, self.shape_selected)

    def OnPaint(self, event):
        dc = wxPaintDC(self)
        if self.map is None or not self.map.HasLayers():
            return
        self.redraw_on_idle = 1

    def do_redraw(self):
        width, height = self.GetSizeTuple()
        bitmap = wx.wxEmptyBitmap(width, height)

        dc = wx.wxMemoryDC()
        dc.SelectObject(bitmap)

        dc.BeginDrawing()

        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
            
        renderer = ScreenRenderer(dc, self.scale, self.offset)
        renderer.RenderMap(self.map, selected_layer, selected_shape)

        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()

    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
        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):
        width, height = self.GetSizeTuple()
        scale = self.scale * factor
        offx, offy = self.offset
        offset = (factor * (offx - width / 2) + width / 2,
                  factor * (offy - height / 2) + 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):
        """Return a tuple shape at point px, py in window coords."""
        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)):
                    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
                
        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()):
                    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()):
                    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()):
                    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)
        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	bh	6	# Copyright (c) 2001 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			self.view.FitRectToWindow(self.proj_rect())
131
132
133			class ZoomOutTool(RectTool):
134
135			"""The Zoom-Out Tool"""
136
137			def Name(self):
138			return "ZoomOutTool"
139
140			def MouseUp(self, event):
141			if self.dragging:
142			Tool.MouseUp(self, event)
143			sx, sy = self.start
144			cx, cy = self.current
145			self.view.ZoomOutToRect((min(sx, cx), min(sy, cy),
146			max(sx, cx), max(sy, cy)))
147
148
149			class PanTool(Tool):
150
151			"""The Pan Tool"""
152
153			def Name(self):
154			return "PanTool"
155
156			def MouseMove(self, event):
157			if self.dragging:
158			x0, y0 = self.current
159			Tool.MouseMove(self, event)
160			x, y = self.current
161			width, height = self.view.GetSizeTuple()
162			dc = self.view.drag_dc
163			dc.Blit(0, 0, width, height, dc, x0 - x, y0 - y)
164
165			def MouseUp(self, event):
166			if self.dragging:
167			Tool.MouseUp(self, event)
168			sx, sy = self.start
169			cx, cy = self.current
170			self.view.Translate(cx - sx, cy - sy)
171
172			class IdentifyTool(Tool):
173
174			"""The "Identify" Tool"""
175
176			def Name(self):
177			return "IdentifyTool"
178
179			def MouseUp(self, event):
180			self.view.SelectShapeAt(event.m_x, event.m_y)
181
182
183			class LabelTool(Tool):
184
185			"""The "Label" Tool"""
186
187			def Name(self):
188			return "LabelTool"
189
190			def MouseUp(self, event):
191			self.view.LabelShapeAt(event.m_x, event.m_y)
192
193
194
195
196			class MapPrintout(wx.wxPrintout):
197
198			"""
199			wxPrintout class for printing Thuban maps
200			"""
201
202			def __init__(self, map):
203			wx.wxPrintout.__init__(self)
204			self.map = map
205
206			def GetPageInfo(self):
207			return (1, 1, 1, 1)
208
209			def HasPage(self, pagenum):
210			return pagenum == 1
211
212			def OnPrintPage(self, pagenum):
213			if pagenum == 1:
214			self.draw_on_dc(self.GetDC())
215
216			def draw_on_dc(self, dc):
217			width, height = self.GetPageSizePixels()
218			llx, lly, urx, ury = self.map.ProjectedBoundingBox()
219			scalex = width / (urx - llx)
220			scaley = height / (ury - lly)
221			scale = min(scalex, scaley)
222			offx = 0.5 * (width - (urx + llx) * scale)
223			offy = 0.5 * (height + (ury + lly) * scale)
224
225			resx, resy = self.GetPPIPrinter()
226			renderer = PrinterRender(dc, scale, (offx, offy), resolution = resx)
227			renderer.RenderMap(self.map)
228			return wx.true
229
230
231			class MapCanvas(wxWindow):
232
233			"""A widget that displays a map and offers some interaction"""
234
235			def __init__(self, parent, winid):
236			wxWindow.__init__(self, parent, winid)
237			self.SetBackgroundColour(wxColour(255, 255, 255))
238			self.map = None
239			self.scale = 1.0
240			self.offset = (0, 0)
241			self.dragging = 0
242			self.tool = None
243			self.redraw_on_idle = 0
244			EVT_PAINT(self, self.OnPaint)
245			EVT_LEFT_DOWN(self, self.OnLeftDown)
246			EVT_LEFT_UP(self, self.OnLeftUp)
247			EVT_MOTION(self, self.OnMotion)
248			wx.EVT_IDLE(self, self.OnIdle)
249			import main
250			self.interactor = main.app.interactor
251			self.interactor.Subscribe(SELECTED_SHAPE, self.shape_selected)
252
253			def OnPaint(self, event):
254			dc = wxPaintDC(self)
255			if self.map is None or not self.map.HasLayers():
256			return
257			self.redraw_on_idle = 1
258
259			def do_redraw(self):
260			width, height = self.GetSizeTuple()
261			bitmap = wx.wxEmptyBitmap(width, height)
262
263			dc = wx.wxMemoryDC()
264			dc.SelectObject(bitmap)
265
266			dc.BeginDrawing()
267
268			dc.SetBrush(wx.wxWHITE_BRUSH)
269			dc.SetPen(wx.wxTRANSPARENT_PEN)
270			dc.DrawRectangle(0, 0, width, height)
271
272			if 1: #self.interactor.selected_map is self.map:
273			selected_layer = self.interactor.selected_layer
274			selected_shape = self.interactor.selected_shape
275			else:
276			selected_layer = None
277			selected_shape = None
278
279			renderer = ScreenRenderer(dc, self.scale, self.offset)
280			renderer.RenderMap(self.map, selected_layer, selected_shape)
281
282			clientdc = wxClientDC(self)
283			clientdc.BeginDrawing()
284			clientdc.Blit(0, 0, width, height, dc, 0, 0)
285			clientdc.EndDrawing()
286
287
288			def Print(self):
289			printer = wx.wxPrinter()
290			printout = MapPrintout(self.map)
291			printer.Print(self, printout, wx.true)
292			printout.Destroy()
293
294			def SetMap(self, map):
295			redraw_channels = (LAYERS_CHANGED, LAYER_LEGEND_CHANGED,
296			LAYER_VISIBILITY_CHANGED)
297			if self.map is not None:
298			for channel in redraw_channels:
299			self.map.Unsubscribe(channel, self.redraw)
300			self.map.Unsubscribe(MAP_PROJECTION_CHANGED,
301			self.projection_changed)
302			self.map = map
303			if self.map is not None:
304			for channel in redraw_channels:
305			self.map.Subscribe(channel, self.redraw)
306			self.map.Subscribe(MAP_PROJECTION_CHANGED, self.projection_changed)
307			self.FitMapToWindow()
308
309			def Map(self):
310			return self.map
311
312			def redraw(self, *args):
313			self.Refresh(0)
314
315			def projection_changed(self, *args):
316			self.FitMapToWindow()
317			self.redraw()
318
319			def set_view_transform(self, scale, offset):
320			self.scale = scale
321			self.offset = offset
322			self.redraw()
323
324			def proj_to_win(self, x, y):
325			"""\
326			Return the point in window coords given by projected coordinates x y
327			"""
328			offx, offy = self.offset
329			return (self.scale * x + offx, -self.scale * y + offy)
330
331			def win_to_proj(self, x, y):
332			"""\
333			Return the point in projected coordinates given by window coords x y
334			"""
335			offx, offy = self.offset
336			return ((x - offx) / self.scale, (offy - y) / self.scale)
337
338			def FitRectToWindow(self, rect):
339			width, height = self.GetSizeTuple()
340			llx, lly, urx, ury = rect
341			scalex = width / (urx - llx)
342			scaley = height / (ury - lly)
343			scale = min(scalex, scaley)
344			offx = 0.5 * (width - (urx + llx) * scale)
345			offy = 0.5 * (height + (ury + lly) * scale)
346			self.set_view_transform(scale, (offx, offy))
347
348			def FitMapToWindow(self):
349			"""\
350			Set the scale and offset so that the map is centered in the
351			window
352			"""
353			bbox = self.map.ProjectedBoundingBox()
354			if bbox is not None:
355			self.FitRectToWindow(bbox)
356
357			def ZoomFactor(self, factor):
358			width, height = self.GetSizeTuple()
359			scale = self.scale * factor
360			offx, offy = self.offset
361			offset = (factor * (offx - width / 2) + width / 2,
362			factor * (offy - height / 2) + height / 2)
363			self.set_view_transform(scale, offset)
364
365			def ZoomOutToRect(self, rect):
366			# rect is given in window coordinates
367
368			# determine the bbox of the displayed region in projected
369			# coordinates
370			width, height = self.GetSizeTuple()
371			llx, lly = self.win_to_proj(0, height - 1)
372			urx, ury = self.win_to_proj(width - 1, 0)
373
374			sx, sy, ex, ey = rect
375			scalex = (ex - sx) / (urx - llx)
376			scaley = (ey - sy) / (ury - lly)
377			scale = min(scalex, scaley)
378
379			offx = 0.5 * ((ex + sx) - (urx + llx) * scale)
380			offy = 0.5 * ((ey + sy) + (ury + lly) * scale)
381			self.set_view_transform(scale, (offx, offy))
382
383			def Translate(self, dx, dy):
384			offx, offy = self.offset
385			self.set_view_transform(self.scale, (offx + dx, offy + dy))
386
387			def ZoomInTool(self):
388			self.tool = ZoomInTool(self)
389
390			def ZoomOutTool(self):
391			self.tool = ZoomOutTool(self)
392
393			def PanTool(self):
394			self.tool = PanTool(self)
395
396			def IdentifyTool(self):
397			self.tool = IdentifyTool(self)
398
399			def LabelTool(self):
400			self.tool = LabelTool(self)
401
402			def CurrentTool(self):
403			return self.tool and self.tool.Name() or None
404
405			def OnLeftDown(self, event):
406			if self.tool is not None:
407			self.drag_dc = wxClientDC(self)
408			self.drag_dc.SetLogicalFunction(wxINVERT)
409			self.drag_dc.SetBrush(wxTRANSPARENT_BRUSH)
410			self.CaptureMouse()
411			self.tool.MouseDown(event)
412			self.tool.Show(self.drag_dc)
413			self.dragging = 1
414
415			def OnLeftUp(self, event):
416			self.ReleaseMouse()
417			if self.dragging:
418			self.tool.Hide(self.drag_dc)
419			self.tool.MouseUp(event)
420			self.drag_dc = None
421			self.dragging = 0
422
423			def OnMotion(self, event):
424			if self.dragging:
425			self.tool.Hide(self.drag_dc)
426			self.tool.MouseMove(event)
427			self.tool.Show(self.drag_dc)
428
429			def OnIdle(self, event):
430			if self.redraw_on_idle:
431			self.do_redraw()
432			self.redraw_on_idle = 0
433
434			def shape_selected(self, layer, shape):
435			self.redraw()
436
437			def find_shape_at(self, px, py, select_labels = 0):
438			"""Return a tuple shape at point px, py in window coords."""
439			map_proj = self.map.projection
440			if map_proj is not None:
441			forward = map_proj.Forward
442			else:
443			forward = None
444
445			scale = self.scale
446			offx, offy = self.offset
447
448			if select_labels:
449			labels = self.map.LabelLayer().Labels()
450
451			if labels:
452			dc = wxClientDC(self)
453			font = wxFont(10, wx.wxSWISS, wx.wxNORMAL, wx.wxNORMAL)
454			dc.SetFont(font)
455			for i in range(len(labels)):
456			label = labels[i]
457			x = label.x
458			y = label.y
459			text = label.text
460			if forward:
461			x, y = forward(x, y)
462			x = x * scale + offx
463			y = -y * scale + offy
464			width, height = dc.GetTextExtent(text)
465			if label.halign == ALIGN_LEFT:
466			# nothing to be done
467			pass
468			elif label.halign == ALIGN_RIGHT:
469			x = x - width
470			elif label.halign == ALIGN_CENTER:
471			x = x - width/2
472			if label.valign == ALIGN_TOP:
473			# nothing to be done
474			pass
475			elif label.valign == ALIGN_BOTTOM:
476			y = y - height
477			elif label.valign == ALIGN_CENTER:
478			y = y - height/2
479			if x <= px < x + width and y <= py <= y + height:
480			return None, i
481
482			layers = self.map.Layers()
483			for layer_index in range(len(layers) - 1, -1, -1):
484			layer = layers[layer_index]
485
486			# search only in visible layers
487			if not layer.Visible():
488			continue
489
490			filled = layer.fill is not None
491			stroked = layer.stroke is not None
492
493			layer_proj = layer.projection
494			if layer_proj is not None:
495			inverse = layer_proj.Inverse
496			else:
497			inverse = None
498
499			shapetype = layer.ShapeType()
500
501			select_shape = -1
502			if shapetype == SHAPETYPE_POLYGON:
503			for i in range(layer.NumShapes()):
504			result = point_in_polygon_shape(layer.shapefile.cobject(),
505			i,
506			filled, stroked,
507			map_proj, layer_proj,
508			scale, -scale, offx, offy,
509			px, py)
510			if result:
511			select_shape = i
512			break
513			elif shapetype == SHAPETYPE_ARC:
514			for i in range(layer.NumShapes()):
515			result = point_in_polygon_shape(layer.shapefile.cobject(),
516			i, 0, 1,
517			map_proj, layer_proj,
518			scale, -scale, offx, offy,
519			px, py)
520			if result < 0:
521			select_shape = i
522			break
523			elif shapetype == SHAPETYPE_POINT:
524			for i in range(layer.NumShapes()):
525			shape = layer.Shape(i)
526			x, y = shape.Points()[0]
527			if inverse:
528			x, y = inverse(x, y)
529			if forward:
530			x, y = forward(x, y)
531			x = x * scale + offx
532			y = -y * scale + offy
533			if hypot(px - x, py - y) < 5:
534			select_shape = i
535			break
536
537			if select_shape >= 0:
538			return layer, select_shape
539			return None, None
540
541			def SelectShapeAt(self, x, y):
542			layer, shape = self.find_shape_at(x, y)
543			self.interactor.SelectLayerAndShape(layer, shape)
544
545			def LabelShapeAt(self, x, y):
546			ox = x; oy = y
547			label_layer = self.map.LabelLayer()
548			layer, shape_index = self.find_shape_at(x, y, select_labels = 1)
549			if layer is None and shape_index is not None:
550			# a label was selected
551			label_layer.RemoveLabel(shape_index)
552			elif layer is not None:
553			text = labeldialog.run_label_dialog(self, layer.table, shape_index)
554			if text:
555			proj = self.map.projection
556			if proj is not None:
557			map_proj = proj
558			else:
559			map_proj = None
560			proj = layer.projection
561			if proj is not None:
562			layer_proj = proj
563			else:
564			layer_proj = None
565
566			shapetype = layer.ShapeType()
567			if shapetype == SHAPETYPE_POLYGON:
568			x, y = shape_centroid(layer.shapefile.cobject(),
569			shape_index,
570			map_proj, layer_proj, 1, 1, 0, 0)
571			if map_proj is not None:
572			x, y = map_proj.Inverse(x, y)
573			else:
574			shape = layer.Shape(shape_index)
575			if shapetype == SHAPETYPE_POINT:
576			x, y = shape.Points()[0]
577			else:
578			# assume SHAPETYPE_ARC
579			points = shape.Points()
580			x, y = points[len(points) / 2]
581			if layer_proj is not None:
582			x, y = layer_proj.Inverse(x, y)
583			if shapetype == SHAPETYPE_POINT:
584			halign = ALIGN_LEFT
585			valign = ALIGN_CENTER
586			elif shapetype == SHAPETYPE_POLYGON:
587			halign = ALIGN_CENTER
588			valign = ALIGN_CENTER
589			elif shapetype == SHAPETYPE_ARC:
590			halign = ALIGN_LEFT
591			valign = ALIGN_CENTER
592			label_layer.AddLabel(x, y, text,
593			halign = halign, valign = valign)
Name	Value
svn:eol-style	native
svn:keywords	Author Date Id Revision