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

        assert(scale > 0)

        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
        lc = layer.GetClassification()
        field = lc.GetField()

        defaultProps = lc.GetDefaultGroup().GetProperties()

        for i in self.layer_ids(layer):
            value = None

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

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

            # 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.GetLineColor()
                stroke_width = prop.GetLineWidth()
                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):
        pp = self.projected_points(layer, index)

        if len(pp) == 0: return # ignore Null Shapes which have no points

        p = pp[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_shapes):
        """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
        shapes given by the ids in selected_shapes in the
        selected_layer.
        """
        self.update_region = region
        self.selected_layer = selected_layer
        self.selected_shapes = selected_shapes
        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_shapes:
            pen = wxPen(wxBLACK, 3, wxSOLID)
            brush = wxBrush(wxBLACK, wxCROSS_HATCH)

            shapetype = layer.ShapeType()
            if shapetype == SHAPETYPE_POLYGON:
                func = self.draw_polygon_shape
                args = (pen, brush)
            elif shapetype == SHAPETYPE_ARC:
                func = self.draw_polygon_shape
                args = (pen, None)
            elif shapetype == SHAPETYPE_POINT:
                self.dc.SetBrush(brush)
                self.dc.SetPen(pen)
                func = self.draw_point_shape
                args = ()
            else:
                raise TypeError(_("Unhandled shape type %s") % shapetype)

            for index in self.selected_shapes:
                func(layer, index, *args)

    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	jonathan	574
52			assert(scale > 0)
53
54	bh	6	self.dc = dc
55			self.scale = scale
56			self.offset = offset
57			if honor_visibility is not None:
58			self.honor_visibility = honor_visibility
59			# store the resolution in pixel/point because it's more useful
60			# later.
61			self.resolution = resolution / 72.0
62
63			def render_map(self, map):
64			self.map = map
65			for layer in map.Layers():
66			# if honor_visibility is true, only draw visible layers,
67			# otherwise draw all layers
68			if not self.honor_visibility or layer.Visible():
69			self.draw_shape_layer(layer)
70			self.draw_label_layer(map.LabelLayer())
71
72			def draw_shape_layer(self, layer):
73			scale = self.scale
74			offx, offy = self.offset
75
76			map_proj = self.map.projection
77			layer_proj = layer.projection
78
79			shapetype = layer.ShapeType()
80
81	jonathan	362	brush = wxTRANSPARENT_BRUSH
82			pen = wxTRANSPARENT_PEN
83
84			old_prop = None
85	jonathan	468	lc = layer.GetClassification()
86			field = lc.GetField()
87
88			defaultProps = lc.GetDefaultGroup().GetProperties()
89
90	jonathan	362	for i in self.layer_ids(layer):
91			value = None
92
93			if field is not None:
94	jonathan	468	try:
95			record = layer.table.read_record(i)
96			if record is not None:
97			value = record[field]
98			except:
99			pass
100	jonathan	362
101	jonathan	468	#
102			# if the above statements fail 'value' should
103			# be null, at which point this call will
104			# at least retreive the NullData
105			#
106			prop = lc.GetProperties(value)
107			else:
108			prop = defaultProps
109	jonathan	362
110	jonathan	442	# don't recreate new objects if they are the same as before
111			if prop != old_prop:
112	jonathan	362	old_prop = prop
113
114			if shapetype == SHAPETYPE_ARC:
115	jonathan	416	fill = Color.None
116	jonathan	362	else:
117	jonathan	394	fill = prop.GetFill()
118	jonathan	362
119	jonathan	416	if fill is Color.None:
120	jonathan	362	brush = wxTRANSPARENT_BRUSH
121			else:
122	jonathan	442	color = Color2wxColour(fill)
123	jonathan	362	brush = wxBrush(color, wxSOLID)
124
125	jonathan	468	stroke = prop.GetLineColor()
126			stroke_width = prop.GetLineWidth()
127	jonathan	416	if stroke is Color.None:
128	jonathan	362	pen = wxTRANSPARENT_PEN
129			else:
130	jonathan	442	color = Color2wxColour(stroke)
131	jonathan	362	pen = wxPen(color, stroke_width, wxSOLID)
132
133			if shapetype == SHAPETYPE_POINT:
134			self.dc.SetBrush(brush)
135			self.dc.SetPen(pen)
136			self.draw_point_shape(layer, i)
137			else:
138	bh	6	self.draw_polygon_shape(layer, i, pen, brush)
139
140	bh	144	def layer_ids(self, layer):
141			"""Return the shape ids of the given layer that have to be drawn.
142
143			The default implementation simply returns all ids in the layer.
144			Override in derived classes to be more precise.
145			"""
146			return range(layer.NumShapes())
147
148	bh	6	def draw_polygon_shape(self, layer, index, pen, brush):
149			offx, offy = self.offset
150			draw_polygon_shape(layer.shapefile.cobject(), index,
151			self.dc, pen, brush,
152			self.map.projection, layer.projection,
153			self.scale, -self.scale, offx, offy)
154
155			def projected_points(self, layer, index):
156			proj = self.map.projection
157			if proj is not None:
158			forward = proj.Forward
159			else:
160			forward = None
161			proj = layer.projection
162			if proj is not None:
163			inverse = proj.Inverse
164			else:
165			inverse = None
166			shape = layer.Shape(index)
167			points = []
168			scale = self.scale
169			offx, offy = self.offset
170			for x, y in shape.Points():
171			if inverse:
172			x, y = inverse(x, y)
173			if forward:
174			x, y = forward(x, y)
175			points.append(wxPoint(x * scale + offx,
176			-y * scale + offy))
177			return points
178
179			def draw_arc_shape(self, layer, index):
180			points = self.projected_points(layer, index)
181			self.dc.DrawLines(points)
182
183			def draw_point_shape(self, layer, index):
184	jonathan	588	pp = self.projected_points(layer, index)
185
186			if len(pp) == 0: return # ignore Null Shapes which have no points
187
188			p = pp[0]
189	bh	6	radius = self.resolution * 5
190			self.dc.DrawEllipse(p.x - radius, p.y - radius, 2radius, 2radius)
191
192			def draw_label_layer(self, layer):
193			scale = self.scale
194			offx, offy = self.offset
195
196			font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
197			self.dc.SetFont(font)
198
199			map_proj = self.map.projection
200			if map_proj is not None:
201			forward = map_proj.Forward
202			else:
203			forward = None
204
205			for label in layer.Labels():
206			x = label.x
207			y = label.y
208			text = label.text
209			if forward:
210			x, y = forward(x, y)
211			x = x * scale + offx
212			y = -y * scale + offy
213			width, height = self.dc.GetTextExtent(text)
214			if label.halign == ALIGN_LEFT:
215			# nothing to be done
216			pass
217			elif label.halign == ALIGN_RIGHT:
218			x = x - width
219			elif label.halign == ALIGN_CENTER:
220			x = x - width/2
221			if label.valign == ALIGN_TOP:
222			# nothing to be done
223			pass
224			elif label.valign == ALIGN_BOTTOM:
225			y = y - height
226			elif label.valign == ALIGN_CENTER:
227			y = y - height/2
228			self.dc.DrawText(text, x, y)
229
230
231			class ScreenRenderer(MapRenderer):
232
233			# On the screen we want to see only visible layers by default
234			honor_visibility = 1
235
236	bh	535	def RenderMap(self, map, region, selected_layer, selected_shapes):
237	bh	144	"""Render the map.
238
239	bh	148	Only the given region (a tuple in window coordinates as returned
240			by a wxrect's asTuple method) needs to be redrawn. Highlight the
241	bh	535	shapes given by the ids in selected_shapes in the
242			selected_layer.
243	bh	144	"""
244			self.update_region = region
245	bh	6	self.selected_layer = selected_layer
246	bh	535	self.selected_shapes = selected_shapes
247	bh	6	self.render_map(map)
248
249			def draw_shape_layer(self, layer):
250			MapRenderer.draw_shape_layer(self, layer)
251	bh	535	if layer is self.selected_layer and self.selected_shapes:
252	bh	6	pen = wxPen(wxBLACK, 3, wxSOLID)
253			brush = wxBrush(wxBLACK, wxCROSS_HATCH)
254	bh	535
255	bh	6	shapetype = layer.ShapeType()
256			if shapetype == SHAPETYPE_POLYGON:
257	bh	535	func = self.draw_polygon_shape
258			args = (pen, brush)
259	bh	290	elif shapetype == SHAPETYPE_ARC:
260	bh	535	func = self.draw_polygon_shape
261			args = (pen, None)
262			elif shapetype == SHAPETYPE_POINT:
263	bh	6	self.dc.SetBrush(brush)
264			self.dc.SetPen(pen)
265	bh	535	func = self.draw_point_shape
266			args = ()
267			else:
268			raise TypeError(_("Unhandled shape type %s") % shapetype)
269	bh	6
270	bh	535	for index in self.selected_shapes:
271			func(layer, index, *args)
272
273	bh	144	def layer_ids(self, layer):
274			"""Return the shapeids covered by the region that has to be redrawn
275	bh	6
276	bh	144	Call the layer's ShapesInRegion method to determine the ids so
277			that it can use the quadtree.
278			"""
279			# FIXME: the quad-tree should be built from the projected
280			# coordinates not the lat-long ones because it's not trivial to
281			# determine an appropriate rectangle in lat-long for a given
282			# rectangle in projected coordinates which we have to start from
283			# here.
284			proj = self.map.projection
285			if proj is not None:
286			inverse = proj.Inverse
287			else:
288			inverse = None
289
290			scale = self.scale
291			offx, offy = self.offset
292			xs = []
293			ys = []
294	bh	148	x, y, width, height = self.update_region
295	bh	144	for winx, winy in ((x, y), (x + width, y),
296			(x + width, y + height), (x, y + height)):
297			px = (winx - offx) / scale
298			py = -(winy - offy) / scale
299			if inverse:
300			px, py = inverse(px, py)
301			xs.append(px)
302			ys.append(py)
303			left = min(xs)
304			right = max(xs)
305			top = max(ys)
306			bottom = min(ys)
307
308			return layer.ShapesInRegion((left, bottom, right, top))
309
310
311	bh	6	class PrinterRender(MapRenderer):
312
313			# When printing we want to see all layers
314			honor_visibility = 0
315
316			RenderMap = MapRenderer.render_map
317
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svn:keywords	Author Date Id Revision