Thuban/UI/renderer.py

# Copyright (c) 2001, 2002, 2003 by Intevation GmbH
# Authors:
# Bernhard Herzog <[email protected]>
# Jonathan Coles <[email protected]>
#
# This program is free software under the GPL (>=v2)
# Read the file COPYING coming with Thuban for details.

__version__ = "$Revision$"

from wxPython.wx import wxPoint, wxPen, wxBrush, wxFont, \
     wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \
     wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL

from wxproj import draw_polygon_shape

from Thuban import _
from Thuban.UI.common import *

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, ALIGN_BASELINE

from Thuban.Model.classification import Classification
from Thuban.Model.color import Color


class MapRenderer:

    """Class to render a map onto a wxDC"""

    honor_visibility = 1

    def __init__(self, dc, scale, offset, resolution = 72.0,
                 honor_visibility = None):
        """Inititalize the renderer.

        dc -- the wxPython DC to render on
        scale, offset -- the scale factor and translation to convert
                between projected coordinates and the DC coordinates

        resolution -- the assumed resolution of the DC. Used to convert
                absolute lengths like font sizes to DC coordinates

        honor_visibility -- boolean. If true, honor the visibility flag
                of the layers, otherwise draw all layers. If None, use
                the renderer's default.
        """
        # resolution in pixel/inch
        self.dc = dc
        self.scale = scale
        self.offset = offset
        if honor_visibility is not None:
            self.honor_visibility = honor_visibility
        # store the resolution in pixel/point because it's more useful
        # later.
        self.resolution = resolution / 72.0

    def render_map(self, map):
        self.map = map
        for layer in map.Layers():
            # if honor_visibility is true, only draw visible layers,
            # otherwise draw all layers
            if not self.honor_visibility or layer.Visible():
                self.draw_shape_layer(layer)
        self.draw_label_layer(map.LabelLayer())

    def draw_shape_layer(self, layer):
        scale = self.scale
        offx, offy = self.offset

        map_proj = self.map.projection
        layer_proj = layer.projection

        shapetype = layer.ShapeType()

        brush = wxTRANSPARENT_BRUSH
        pen   = wxTRANSPARENT_PEN

        old_prop = None
        for i in self.layer_ids(layer):
            value = None
            lc = layer.GetClassification()
            field = lc.field

            if field is not None:
                record = layer.table.read_record(i)
                if record is not None:
                    value = record[field]

            #
            # if the above statements fail 'value' should
            # be null, at which point this call will
            # at least retreive the NullData
            #
            prop = lc.GetProperties(value)

            # don't recreate new objects if they are the same as before
            if prop != old_prop: 
                old_prop = prop

                if shapetype == SHAPETYPE_ARC:
                    fill = Color.None
                else:
                    fill = prop.GetFill()
    
                if fill is Color.None:
                    brush = wxTRANSPARENT_BRUSH
                else:
                    color = Color2wxColour(fill)
                    brush = wxBrush(color, wxSOLID)
    
                stroke = prop.GetStroke()
                stroke_width = prop.GetStrokeWidth()
                if stroke is Color.None:
                    pen = wxTRANSPARENT_PEN
                else:
                    color = Color2wxColour(stroke)
                    pen = wxPen(color, stroke_width, wxSOLID)
    
            if shapetype == SHAPETYPE_POINT:
                self.dc.SetBrush(brush)
                self.dc.SetPen(pen)
                self.draw_point_shape(layer, i)
            else:
                self.draw_polygon_shape(layer, i, pen, brush)

    def layer_ids(self, layer):
        """Return the shape ids of the given layer that have to be drawn.
        
        The default implementation simply returns all ids in the layer.
        Override in derived classes to be more precise.
        """
        return range(layer.NumShapes())

    def draw_polygon_shape(self, layer, index, pen, brush):
        offx, offy = self.offset        
        draw_polygon_shape(layer.shapefile.cobject(), index,
                           self.dc, pen, brush,
                           self.map.projection, layer.projection,
                           self.scale, -self.scale, offx, offy)

    def projected_points(self, layer, index):
        proj = self.map.projection
        if proj is not None:
            forward = proj.Forward
        else:
            forward = None
        proj = layer.projection
        if proj is not None:
            inverse = proj.Inverse
        else:
            inverse = None
        shape = layer.Shape(index)
        points = []
        scale = self.scale
        offx, offy = self.offset
        for x, y in shape.Points():
            if inverse:
                x, y = inverse(x, y)
            if forward:
                x, y = forward(x, y)
            points.append(wxPoint(x * scale + offx,
                                  -y * scale + offy))
        return points

    def draw_arc_shape(self, layer, index):
        points = self.projected_points(layer, index)
        self.dc.DrawLines(points)

    def draw_point_shape(self, layer, index):
        p = self.projected_points(layer, index)[0]
        radius = self.resolution * 5
        self.dc.DrawEllipse(p.x - radius, p.y - radius, 2*radius, 2*radius)

    def draw_label_layer(self, layer):
        scale = self.scale
        offx, offy = self.offset

        font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
        self.dc.SetFont(font)

        map_proj = self.map.projection
        if map_proj is not None:
            forward = map_proj.Forward
        else:
            forward = None

        for label in layer.Labels():
            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 = self.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
            self.dc.DrawText(text, x, y)


class ScreenRenderer(MapRenderer):

    # On the screen we want to see only visible layers by default
    honor_visibility = 1
    
    def RenderMap(self, map, region, selected_layer, selected_shape):
        """Render the map.

        Only the given region (a tuple in window coordinates as returned
        by a wxrect's asTuple method) needs to be redrawn. Highlight the
        shape with id selected_shape in the selected_layer.
        """
        self.update_region = region
        self.selected_layer = selected_layer
        self.selected_shape = selected_shape
        self.render_map(map)

    def draw_shape_layer(self, layer):
        MapRenderer.draw_shape_layer(self, layer)
        if layer is self.selected_layer and self.selected_shape is not None:
            pen = wxPen(wxBLACK, 3, wxSOLID)
            brush = wxBrush(wxBLACK, wxCROSS_HATCH)
            
            shapetype = layer.ShapeType()
            index = self.selected_shape
            if shapetype == SHAPETYPE_POLYGON:
                self.draw_polygon_shape(layer, index, pen, brush)
            elif shapetype == SHAPETYPE_ARC:
                self.draw_polygon_shape(layer, index, pen, None)
            else:
                self.dc.SetBrush(brush)
                self.dc.SetPen(pen)
                if shapetype == SHAPETYPE_POINT:
                    self.draw_point_shape(layer, index)
                else:
                    raise TypeError(_("Unhandled shape type %s") % shapetype)

    def layer_ids(self, layer):
        """Return the shapeids covered by the region that has to be redrawn

        Call the layer's ShapesInRegion method to determine the ids so
        that it can use the quadtree.
        """
        # FIXME: the quad-tree should be built from the projected
        # coordinates not the lat-long ones because it's not trivial to
        # determine an appropriate rectangle in lat-long for a given
        # rectangle in projected coordinates which we have to start from
        # here.
        proj = self.map.projection
        if proj is not None:
            inverse = proj.Inverse
        else:
            inverse = None

        scale = self.scale
        offx, offy = self.offset
        xs = []
        ys = []
        x, y, width, height = self.update_region
        for winx, winy in ((x, y), (x + width, y),
                           (x + width, y + height), (x, y + height)):
            px = (winx - offx) / scale
            py = -(winy - offy) / scale
            if inverse:
                px, py = inverse(px, py)
            xs.append(px)
            ys.append(py)
        left = min(xs)
        right = max(xs)
        top = max(ys)
        bottom = min(ys)

        return layer.ShapesInRegion((left, bottom, right, top))


class PrinterRender(MapRenderer):

    # When printing we want to see all layers
    honor_visibility = 0

    RenderMap = MapRenderer.render_map
    
1	bh	424	# Copyright (c) 2001, 2002, 2003 by Intevation GmbH
2	bh	6	# Authors:
3			# Bernhard Herzog <[email protected]>
4	jonathan	416	# Jonathan Coles <[email protected]>
5	bh	6	#
6			# This program is free software under the GPL (>=v2)
7			# Read the file COPYING coming with Thuban for details.
8
9			__version__ = "$Revision$"
10
11	jonathan	442	from wxPython.wx import wxPoint, wxPen, wxBrush, wxFont, \
12	bh	6	wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \
13			wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL
14
15			from wxproj import draw_polygon_shape
16
17	jan	374	from Thuban import _
18	jonathan	442	from Thuban.UI.common import *
19	jan	374
20	bh	6	from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \
21			SHAPETYPE_POINT
22			from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \
23			ALIGN_LEFT, ALIGN_RIGHT, ALIGN_BASELINE
24
25	jonathan	394	from Thuban.Model.classification import Classification
26	jonathan	416	from Thuban.Model.color import Color
27	bh	6
28	jonathan	394
29	bh	6	class MapRenderer:
30
31			"""Class to render a map onto a wxDC"""
32
33			honor_visibility = 1
34
35			def __init__(self, dc, scale, offset, resolution = 72.0,
36			honor_visibility = None):
37			"""Inititalize the renderer.
38
39			dc -- the wxPython DC to render on
40			scale, offset -- the scale factor and translation to convert
41			between projected coordinates and the DC coordinates
42
43			resolution -- the assumed resolution of the DC. Used to convert
44			absolute lengths like font sizes to DC coordinates
45
46			honor_visibility -- boolean. If true, honor the visibility flag
47			of the layers, otherwise draw all layers. If None, use
48			the renderer's default.
49			"""
50			# resolution in pixel/inch
51			self.dc = dc
52			self.scale = scale
53			self.offset = offset
54			if honor_visibility is not None:
55			self.honor_visibility = honor_visibility
56			# store the resolution in pixel/point because it's more useful
57			# later.
58			self.resolution = resolution / 72.0
59
60			def render_map(self, map):
61			self.map = map
62			for layer in map.Layers():
63			# if honor_visibility is true, only draw visible layers,
64			# otherwise draw all layers
65			if not self.honor_visibility or layer.Visible():
66			self.draw_shape_layer(layer)
67			self.draw_label_layer(map.LabelLayer())
68
69			def draw_shape_layer(self, layer):
70			scale = self.scale
71			offx, offy = self.offset
72
73			map_proj = self.map.projection
74			layer_proj = layer.projection
75
76			shapetype = layer.ShapeType()
77
78	jonathan	362	brush = wxTRANSPARENT_BRUSH
79			pen = wxTRANSPARENT_PEN
80
81			old_prop = None
82			for i in self.layer_ids(layer):
83			value = None
84	jonathan	416	lc = layer.GetClassification()
85	jonathan	394	field = lc.field
86	jonathan	362
87			if field is not None:
88			record = layer.table.read_record(i)
89			if record is not None:
90			value = record[field]
91
92			#
93			# if the above statements fail 'value' should
94			# be null, at which point this call will
95			# at least retreive the NullData
96			#
97	jonathan	442	prop = lc.GetProperties(value)
98	jonathan	362
99	jonathan	442	# don't recreate new objects if they are the same as before
100			if prop != old_prop:
101	jonathan	362	old_prop = prop
102
103			if shapetype == SHAPETYPE_ARC:
104	jonathan	416	fill = Color.None
105	jonathan	362	else:
106	jonathan	394	fill = prop.GetFill()
107	jonathan	362
108	jonathan	416	if fill is Color.None:
109	jonathan	362	brush = wxTRANSPARENT_BRUSH
110			else:
111	jonathan	442	color = Color2wxColour(fill)
112	jonathan	362	brush = wxBrush(color, wxSOLID)
113
114	jonathan	394	stroke = prop.GetStroke()
115			stroke_width = prop.GetStrokeWidth()
116	jonathan	416	if stroke is Color.None:
117	jonathan	362	pen = wxTRANSPARENT_PEN
118			else:
119	jonathan	442	color = Color2wxColour(stroke)
120	jonathan	362	pen = wxPen(color, stroke_width, wxSOLID)
121
122			if shapetype == SHAPETYPE_POINT:
123			self.dc.SetBrush(brush)
124			self.dc.SetPen(pen)
125			self.draw_point_shape(layer, i)
126			else:
127	bh	6	self.draw_polygon_shape(layer, i, pen, brush)
128
129	bh	144	def layer_ids(self, layer):
130			"""Return the shape ids of the given layer that have to be drawn.
131
132			The default implementation simply returns all ids in the layer.
133			Override in derived classes to be more precise.
134			"""
135			return range(layer.NumShapes())
136
137	bh	6	def draw_polygon_shape(self, layer, index, pen, brush):
138			offx, offy = self.offset
139			draw_polygon_shape(layer.shapefile.cobject(), index,
140			self.dc, pen, brush,
141			self.map.projection, layer.projection,
142			self.scale, -self.scale, offx, offy)
143
144			def projected_points(self, layer, index):
145			proj = self.map.projection
146			if proj is not None:
147			forward = proj.Forward
148			else:
149			forward = None
150			proj = layer.projection
151			if proj is not None:
152			inverse = proj.Inverse
153			else:
154			inverse = None
155			shape = layer.Shape(index)
156			points = []
157			scale = self.scale
158			offx, offy = self.offset
159			for x, y in shape.Points():
160			if inverse:
161			x, y = inverse(x, y)
162			if forward:
163			x, y = forward(x, y)
164			points.append(wxPoint(x * scale + offx,
165			-y * scale + offy))
166			return points
167
168			def draw_arc_shape(self, layer, index):
169			points = self.projected_points(layer, index)
170			self.dc.DrawLines(points)
171
172			def draw_point_shape(self, layer, index):
173			p = self.projected_points(layer, index)[0]
174			radius = self.resolution * 5
175			self.dc.DrawEllipse(p.x - radius, p.y - radius, 2radius, 2radius)
176
177			def draw_label_layer(self, layer):
178			scale = self.scale
179			offx, offy = self.offset
180
181			font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
182			self.dc.SetFont(font)
183
184			map_proj = self.map.projection
185			if map_proj is not None:
186			forward = map_proj.Forward
187			else:
188			forward = None
189
190			for label in layer.Labels():
191			x = label.x
192			y = label.y
193			text = label.text
194			if forward:
195			x, y = forward(x, y)
196			x = x * scale + offx
197			y = -y * scale + offy
198			width, height = self.dc.GetTextExtent(text)
199			if label.halign == ALIGN_LEFT:
200			# nothing to be done
201			pass
202			elif label.halign == ALIGN_RIGHT:
203			x = x - width
204			elif label.halign == ALIGN_CENTER:
205			x = x - width/2
206			if label.valign == ALIGN_TOP:
207			# nothing to be done
208			pass
209			elif label.valign == ALIGN_BOTTOM:
210			y = y - height
211			elif label.valign == ALIGN_CENTER:
212			y = y - height/2
213			self.dc.DrawText(text, x, y)
214
215
216			class ScreenRenderer(MapRenderer):
217
218			# On the screen we want to see only visible layers by default
219			honor_visibility = 1
220
221	bh	144	def RenderMap(self, map, region, selected_layer, selected_shape):
222			"""Render the map.
223
224	bh	148	Only the given region (a tuple in window coordinates as returned
225			by a wxrect's asTuple method) needs to be redrawn. Highlight the
226			shape with id selected_shape in the selected_layer.
227	bh	144	"""
228			self.update_region = region
229	bh	6	self.selected_layer = selected_layer
230			self.selected_shape = selected_shape
231			self.render_map(map)
232
233			def draw_shape_layer(self, layer):
234			MapRenderer.draw_shape_layer(self, layer)
235			if layer is self.selected_layer and self.selected_shape is not None:
236			pen = wxPen(wxBLACK, 3, wxSOLID)
237			brush = wxBrush(wxBLACK, wxCROSS_HATCH)
238
239			shapetype = layer.ShapeType()
240			index = self.selected_shape
241			if shapetype == SHAPETYPE_POLYGON:
242			self.draw_polygon_shape(layer, index, pen, brush)
243	bh	290	elif shapetype == SHAPETYPE_ARC:
244			self.draw_polygon_shape(layer, index, pen, None)
245	bh	6	else:
246			self.dc.SetBrush(brush)
247			self.dc.SetPen(pen)
248	bh	290	if shapetype == SHAPETYPE_POINT:
249			self.draw_point_shape(layer, index)
250			else:
251	jan	374	raise TypeError(_("Unhandled shape type %s") % shapetype)
252	bh	6
253	bh	144	def layer_ids(self, layer):
254			"""Return the shapeids covered by the region that has to be redrawn
255	bh	6
256	bh	144	Call the layer's ShapesInRegion method to determine the ids so
257			that it can use the quadtree.
258			"""
259			# FIXME: the quad-tree should be built from the projected
260			# coordinates not the lat-long ones because it's not trivial to
261			# determine an appropriate rectangle in lat-long for a given
262			# rectangle in projected coordinates which we have to start from
263			# here.
264			proj = self.map.projection
265			if proj is not None:
266			inverse = proj.Inverse
267			else:
268			inverse = None
269
270			scale = self.scale
271			offx, offy = self.offset
272			xs = []
273			ys = []
274	bh	148	x, y, width, height = self.update_region
275	bh	144	for winx, winy in ((x, y), (x + width, y),
276			(x + width, y + height), (x, y + height)):
277			px = (winx - offx) / scale
278			py = -(winy - offy) / scale
279			if inverse:
280			px, py = inverse(px, py)
281			xs.append(px)
282			ys.append(py)
283			left = min(xs)
284			right = max(xs)
285			top = max(ys)
286			bottom = min(ys)
287
288			return layer.ShapesInRegion((left, bottom, right, top))
289
290
291	bh	6	class PrinterRender(MapRenderer):
292
293			# When printing we want to see all layers
294			honor_visibility = 0
295
296			RenderMap = MapRenderer.render_map
297
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svn:keywords	Author Date Id Revision