Thuban/UI/renderer.py

# Copyright (c) 2001-2004 by Intevation GmbH
# Authors:
# Bernhard Herzog <[email protected]> (2001-2003)
# Jonathan Coles <[email protected]> (2003)
# Frank Koormann <[email protected]> (2003)
# Jan-Oliver Wagner <[email protected]> (2003, 2004)
#
# This program is free software under the GPL (>=v2)
# Read the file COPYING coming with Thuban for details.

from __future__ import generators

__version__ = "$Revision$"
# $Source$
# $Id$

import cStringIO

from Thuban import _

from wxPython.wx import wxPoint, wxRect, wxPen, wxBrush, wxFont, \
    wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \
    wxBLACK_PEN, wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL, \
    wxBitmapFromImage, wxImageFromStream, wxBITMAP_TYPE_BMP, \
    wxBITMAP_TYPE_JPEG, wxBITMAP_TYPE_PNG, wxBITMAP_TYPE_TIF, \
    wxBITMAP_TYPE_GIF, wxEmptyImage, wxMask, wxBitmapFromBits

from wxproj import draw_polygon_shape, draw_polygon_init

from Thuban.UI.common import Color2wxColour
from Thuban.UI.classifier import ClassDataPreviewer
from Thuban.UI.scalebar import ScaleBar

from Thuban.Model.data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \
     SHAPETYPE_POINT, RAW_SHAPEFILE

from Thuban.Model.color import Transparent
import Thuban.Model.resource

from baserenderer import BaseRenderer

from math import floor

from types import StringType


# Map the strings used for the format parameter of the draw_raster_data
# method to the appropriate wxWindows constants
raster_format_map = {
    "BMP": wxBITMAP_TYPE_BMP,
    "JPEG": wxBITMAP_TYPE_JPEG,
    "PNG": wxBITMAP_TYPE_PNG,
    "TIFF": wxBITMAP_TYPE_TIF,
    "GIF": wxBITMAP_TYPE_GIF,
    }

class MapRenderer(BaseRenderer):

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

    TRANSPARENT_PEN = wxTRANSPARENT_PEN
    TRANSPARENT_BRUSH = wxTRANSPARENT_BRUSH

    def make_point(self, x, y):
        return wxPoint(int(round(x)), int(round(y)))

    def tools_for_property(self, prop):
        fill = prop.GetFill()
        if fill is Transparent:
            brush = self.TRANSPARENT_BRUSH
        else:
            brush = wxBrush(Color2wxColour(fill), wxSOLID)

        stroke = prop.GetLineColor()
        if stroke is Transparent:
            pen = self.TRANSPARENT_PEN
        else:
            pen = wxPen(Color2wxColour(stroke), prop.GetLineWidth(), wxSOLID)
        return pen, brush

    def low_level_renderer(self, layer):
        """Override inherited method to provide more efficient renderers

        If the underlying data format is not a shapefile or the layer
        contains points shapes, simply use what the inherited method
        returns.

        Otherwise, i.e. for arc and polygon use the more efficient
        wxproj.draw_polygon_shape and its corresponding parameter
        created with wxproj.draw_polygon_init.
        """
        if (layer.ShapeStore().RawShapeFormat() == RAW_SHAPEFILE
            and layer.ShapeType() in (SHAPETYPE_ARC, SHAPETYPE_POLYGON)):
            offx, offy = self.offset
            return (True, draw_polygon_shape,
                    draw_polygon_init(layer.ShapeStore().Shapefile(),
                                      self.dc, self.map.projection,
                                      layer.projection,
                                      self.scale, -self.scale, offx, offy))
        else:
            return BaseRenderer.low_level_renderer(self, layer)

    def label_font(self):
        return wxFont(int(round(self.resolution * 10)), wxSWISS, wxNORMAL,
                      wxNORMAL)

    def draw_raster_data(self, x,y, data, format = 'BMP'):

        mask = None

        if format == 'RAW':
            image = wxEmptyImage(data[0], data[1])
            image.SetData(data[2][0])
            if data[2][1] is not None:
                mask = wxBitmapFromBits(data[2][1], data[0], data[1], 1)
                mask = wxMask(mask)
        else:
            stream = cStringIO.StringIO(data[2][0])
            image = wxImageFromStream(stream, raster_format_map[format])
            if data[2][1] is not None:
                stream = cStringIO.StringIO(data[2][1])
                mask = wxImageFromStream(stream, raster_format_map[format])
                mask = wxMask(wxBitmapFromImage(mask, 1))

        bitmap = wxBitmapFromImage(image)
        bitmap.SetMask(mask)

        self.dc.DrawBitmap(bitmap, int(round(x)), int(round(y)), True)


class ScreenRenderer(MapRenderer):

    # On the screen we want to see only visible layers by default
    honor_visibility = 1

    def RenderMap(self, 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.selected_layer = selected_layer
        self.selected_shapes = selected_shapes
        self.render_map()

    def RenderMapIncrementally(self):
        """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.
        """
        return self.render_map_incrementally()

    def draw_selection_incrementally(self, layer, selected_shapes):
        """Draw the selected shapes in a emphasized way (i.e.
        with a special pen and brush.
        The drawing is performed incrementally, that means every
        n shapes, the user can have interactions with the map.
        n is currently fixed to 500.

        layer -- the layer where the shapes belong to.
        selected_shapes -- a list of the shape-ids representing the
                           selected shapes for the given layer.
        """
        pen = wxPen(wxBLACK, 3, wxSOLID)
        brush = wxBrush(wxBLACK, wxCROSS_HATCH)

        shapetype = layer.ShapeType()
        useraw, func, param = self.low_level_renderer(layer)
        args = (pen, brush)

        # for point shapes we need to find out the properties
        # to determine the size. Based on table and field,
        # we can find out the properties for object - see below.
        if shapetype == SHAPETYPE_POINT:
            lc = layer.GetClassification()
            field = layer.GetClassificationColumn()
            table = layer.ShapeStore().Table()

        count = 0
        for index in selected_shapes:
            count += 1
            shape = layer.Shape(index)

            # Get the size of the specific property for this
            # point
            if shapetype == SHAPETYPE_POINT and field is not None:
                value = table.ReadValue(shape.ShapeID(), field)
                group = lc.FindGroup(value)
                size = group.GetProperties().GetSize()
                args = (pen, brush, size)

            if useraw:
                data = shape.RawData()
            else:
                data = shape.Points()
            func(param, data, *args)
            if count % 500 == 0:
                yield True

    def layer_shapes(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.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 ExportRenderer(ScreenRenderer):

    honor_visibility = 1

    def __init__(self, *args, **kw):
        """Initialize the ExportRenderer.

        In addition to all parameters of the the ScreenRender
        constructor, this class requires and additional keyword argument
        destination_region with a tuple (minx, miny, maxx, maxy) giving
        the region in dc coordinates which is to contain the map.
        """
        self.destination_region = kw["destination_region"]
        del kw["destination_region"]
        ScreenRenderer.__init__(self, *args, **kw)

    def RenderMap(self, selected_layer, selected_shapes):
        """Render the map.

        The rendering device has been specified during initialisation.
        The device border distance was set in
        Thuban.UI.viewport.output_transform().

        RenderMap renders a frame set (one page frame, one around
        legend/scalebar and one around the map), the map, the legend and
        the scalebar on the given DC. The map is rendered with the
        region displayed in the canvas view, centered on the area
        available for map display.
        """

        self.selected_layer = selected_layer
        self.selected_shapes = selected_shapes

        # Get some dimensions
        llx, lly, urx, ury = self.region
        mminx, mminy, mmaxx, mmaxy = self.destination_region

        # Manipulate the offset to position the map
        offx, offy = self.offset
        # 1. Shift to corner of map drawing area
        offx = offx + mminx
        offy = offy + mminy

        # 2. Center the map on the map drawing area:
        # region identifies the region on the canvas view:
        # center of map drawing area - half the size of region: rendering origin
        self.shiftx = (mmaxx - mminx)*0.5 - (urx - llx)*0.5
        self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5

        self.offset = (offx+self.shiftx, offy+self.shifty)
        self.region = (llx + self.shiftx, lly + self.shifty, urx, ury)

        # Draw the map
        self.dc.BeginDrawing()
        self.dc.DestroyClippingRegion()
        self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,
                                  urx, ury)
        self.render_map()
        self.dc.EndDrawing()

        # Draw the rest (frames, legend, scalebar)
        self.dc.BeginDrawing()
        self.dc.DestroyClippingRegion()

        # Force the font for Legend drawing
        font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
        self.dc.SetFont(font)

        self.render_frame()
        self.render_legend()
        self.render_scalebar()
        self.dc.EndDrawing()

    def render_frame(self):
        """Render the frames for map and legend/scalebar."""

        dc = self.dc
        dc.SetPen(wxBLACK_PEN)
        dc.SetBrush(wxTRANSPARENT_BRUSH)

        # Dimension stuff
        width, height = dc.GetSizeTuple()
        mminx, mminy, mmaxx, mmaxy = self.destination_region

        # Page Frame
        dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)

        # Map Frame
        llx, lly, urx, ury = self.region
        dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)

        # Legend Frame
        dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy)

        dc.DestroyClippingRegion()
        dc.SetClippingRegion(mmaxx+10,mminy,
                             (width-20) - (mmaxx+10), mmaxy-mminy)

    def render_legend(self):
        """Render the legend on the Map."""

        previewer = ClassDataPreviewer()
        dc = self.dc
        dc.SetPen(wxBLACK_PEN)
        dc.SetBrush(wxTRANSPARENT_BRUSH)

        # Dimension stuff
        width, height = dc.GetSizeTuple()
        mminx, mminy, mmaxx, mmaxy = self.destination_region
        textwidth, textheight = dc.GetTextExtent("0")
        iconwidth  = textheight
        iconheight = textheight
        stepy = textheight+3
        dx = 10
        posx = mmaxx + 10 + 5   # 10 pix distance mapframe/legend frame,
                                # 5 pix inside legend frame
        posy = mminy + 5        # 5 pix inside legend frame

        # Render the legend
        dc.SetTextForeground(wxBLACK)
        if self.map.HasLayers():
            layers = self.map.Layers()[:]
            layers.reverse()
            for l in layers:
                if l.Visible():
                    # Render title
                    dc.DrawText(l.Title(), posx, posy)
                    posy+=stepy
                    if l.HasClassification():
                        # Render classification
                        clazz = l.GetClassification()
                        shapeType = l.ShapeType()
                        for g in clazz:
                            if g.IsVisible():
                                previewer.Draw(dc,
                                    wxRect(posx+dx, posy,
                                           iconwidth, iconheight),
                                    g.GetProperties(), shapeType)
                                dc.DrawText(g.GetDisplayText(),
                                            posx+2*dx+iconwidth, posy)
                                posy+=stepy

    def render_scalebar(self):
        """Render the scalebar."""

        scalebar = ScaleBar(self.map)

        # Dimension stuff
        width, height = self.dc.GetSizeTuple()
        mminx, mminy, mmaxx, mmaxy = self.destination_region

        # Render the scalebar
        scalebar.DrawScaleBar(self.scale, self.dc,
                             (mmaxx+10+5, mmaxy-25),
                             ((width-15-5) - (mmaxx+10+5),20)
                            )
        # 10 pix between map and legend frame, 5 pix inside legend frame
        # 25 pix from the legend frame bottom line
        # Width: 15 pix from DC border, 5 pix inside frame, 10, 5 as above
        # Height: 20

class PrinterRenderer(ExportRenderer):

    # Printing as well as Export / Screen display only the visible layer.
    honor_visibility = 1

1	jan	2394	# Copyright (c) 2001-2004 by Intevation GmbH
2	bh	6	# Authors:
3	jan	2394	# Bernhard Herzog <[email protected]> (2001-2003)
4			# Jonathan Coles <[email protected]> (2003)
5			# Frank Koormann <[email protected]> (2003)
6			# Jan-Oliver Wagner <[email protected]> (2003, 2004)
7	bh	6	#
8			# This program is free software under the GPL (>=v2)
9			# Read the file COPYING coming with Thuban for details.
10
11	bh	1866	from __future__ import generators
12
13	bh	6	__version__ = "$Revision$"
14	bh	1866	# $Source$
15			# $Id$
16	bh	6
17	jonathan	938	import cStringIO
18
19	jonathan	882	from Thuban import _
20
21	bh	1552	from wxPython.wx import wxPoint, wxRect, wxPen, wxBrush, wxFont, \
22	frank	909	wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \
23	bh	1552	wxBLACK_PEN, wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL, \
24	joey	2431	wxBitmapFromImage, wxImageFromStream, wxBITMAP_TYPE_BMP, \
25	jonathan	2537	wxBITMAP_TYPE_JPEG, wxBITMAP_TYPE_PNG, wxBITMAP_TYPE_TIF, \
26	jonathan	2552	wxBITMAP_TYPE_GIF, wxEmptyImage, wxMask, wxBitmapFromBits
27	bh	6
28	jonathan	676	from wxproj import draw_polygon_shape, draw_polygon_init
29	bh	6
30	jonathan	882	from Thuban.UI.common import Color2wxColour
31	frank	909	from Thuban.UI.classifier import ClassDataPreviewer
32			from Thuban.UI.scalebar import ScaleBar
33	jan	374
34	bh	1562	from Thuban.Model.data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \
35			SHAPETYPE_POINT, RAW_SHAPEFILE
36	bh	6
37	jonathan	1343	from Thuban.Model.color import Transparent
38	jonathan	1165	import Thuban.Model.resource
39	bh	6
40	bh	1552	from baserenderer import BaseRenderer
41	jonathan	1234
42	jonathan	2537	from math import floor
43	bh	1927
44	jonathan	2537	from types import StringType
45
46
47	bh	1927	# Map the strings used for the format parameter of the draw_raster_data
48			# method to the appropriate wxWindows constants
49			raster_format_map = {
50			"BMP": wxBITMAP_TYPE_BMP,
51			"JPEG": wxBITMAP_TYPE_JPEG,
52	joey	2431	"PNG": wxBITMAP_TYPE_PNG,
53			"TIFF": wxBITMAP_TYPE_TIF,
54			"GIF": wxBITMAP_TYPE_GIF,
55	bh	1927	}
56
57	bh	1552	class MapRenderer(BaseRenderer):
58	bh	6
59			"""Class to render a map onto a wxDC"""
60
61	bh	1552	TRANSPARENT_PEN = wxTRANSPARENT_PEN
62			TRANSPARENT_BRUSH = wxTRANSPARENT_BRUSH
63	bh	6
64	bh	1937	def make_point(self, x, y):
65			return wxPoint(int(round(x)), int(round(y)))
66	bh	6
67	bh	1552	def tools_for_property(self, prop):
68			fill = prop.GetFill()
69			if fill is Transparent:
70			brush = self.TRANSPARENT_BRUSH
71	jonathan	798	else:
72	bh	1552	brush = wxBrush(Color2wxColour(fill), wxSOLID)
73	bh	1219
74	bh	1552	stroke = prop.GetLineColor()
75			if stroke is Transparent:
76			pen = self.TRANSPARENT_PEN
77	jonathan	938	else:
78	bh	1552	pen = wxPen(Color2wxColour(stroke), prop.GetLineWidth(), wxSOLID)
79			return pen, brush
80	jonathan	938
81	bh	1552	def low_level_renderer(self, layer):
82			"""Override inherited method to provide more efficient renderers
83	bh	686
84	bh	1562	If the underlying data format is not a shapefile or the layer
85			contains points shapes, simply use what the inherited method
86			returns.
87
88			Otherwise, i.e. for arc and polygon use the more efficient
89			wxproj.draw_polygon_shape and its corresponding parameter
90			created with wxproj.draw_polygon_init.
91	bh	144	"""
92	bh	1562	if (layer.ShapeStore().RawShapeFormat() == RAW_SHAPEFILE
93			and layer.ShapeType() in (SHAPETYPE_ARC, SHAPETYPE_POLYGON)):
94	bh	1552	offx, offy = self.offset
95	bh	1591	return (True, draw_polygon_shape,
96	bh	1562	draw_polygon_init(layer.ShapeStore().Shapefile(),
97			self.dc, self.map.projection,
98	bh	1552	layer.projection,
99	bh	1562	self.scale, -self.scale, offx, offy))
100			else:
101			return BaseRenderer.low_level_renderer(self, layer)
102	bh	6
103	bh	1552	def label_font(self):
104	bh	1937	return wxFont(int(round(self.resolution * 10)), wxSWISS, wxNORMAL,
105			wxNORMAL)
106	bh	6
107	jonathan	2551	def draw_raster_data(self, x,y, data, format = 'BMP'):
108
109			mask = None
110	jonathan	2552
111	jonathan	2537	if format == 'RAW':
112			image = wxEmptyImage(data[0], data[1])
113	jonathan	2551	image.SetData(data[2][0])
114			if data[2][1] is not None:
115	jonathan	2552	mask = wxBitmapFromBits(data[2][1], data[0], data[1], 1)
116			mask = wxMask(mask)
117	jonathan	2537	else:
118	jonathan	2551	stream = cStringIO.StringIO(data[2][0])
119	jonathan	2537	image = wxImageFromStream(stream, raster_format_map[format])
120	jonathan	2551	if data[2][1] is not None:
121			stream = cStringIO.StringIO(data[2][1])
122			mask = wxImageFromStream(stream, raster_format_map[format])
123	jonathan	2552	mask = wxMask(wxBitmapFromImage(mask, 1))
124	jonathan	2537
125	bh	1552	bitmap = wxBitmapFromImage(image)
126	jonathan	2552	bitmap.SetMask(mask)
127	jonathan	588
128	jonathan	2552	self.dc.DrawBitmap(bitmap, int(round(x)), int(round(y)), True)
129	jonathan	588
130	jonathan	2537
131	bh	6	class ScreenRenderer(MapRenderer):
132
133			# On the screen we want to see only visible layers by default
134			honor_visibility = 1
135	bh	1552
136	bh	1866	def RenderMap(self, selected_layer, selected_shapes):
137	bh	144	"""Render the map.
138
139	bh	148	Only the given region (a tuple in window coordinates as returned
140			by a wxrect's asTuple method) needs to be redrawn. Highlight the
141	bh	535	shapes given by the ids in selected_shapes in the
142			selected_layer.
143	bh	144	"""
144	bh	6	self.selected_layer = selected_layer
145	bh	535	self.selected_shapes = selected_shapes
146	bh	1866	self.render_map()
147	bh	6
148	bh	1866	def RenderMapIncrementally(self):
149			"""Render the map.
150	bh	535
151	bh	1866	Only the given region (a tuple in window coordinates as returned
152			by a wxrect's asTuple method) needs to be redrawn. Highlight the
153			shapes given by the ids in selected_shapes in the
154			selected_layer.
155			"""
156			return self.render_map_incrementally()
157	bh	535
158	bh	1866	def draw_selection_incrementally(self, layer, selected_shapes):
159	jan	2394	"""Draw the selected shapes in a emphasized way (i.e.
160			with a special pen and brush.
161			The drawing is performed incrementally, that means every
162			n shapes, the user can have interactions with the map.
163			n is currently fixed to 500.
164
165			layer -- the layer where the shapes belong to.
166			selected_shapes -- a list of the shape-ids representing the
167			selected shapes for the given layer.
168			"""
169	bh	1866	pen = wxPen(wxBLACK, 3, wxSOLID)
170			brush = wxBrush(wxBLACK, wxCROSS_HATCH)
171
172			shapetype = layer.ShapeType()
173			useraw, func, param = self.low_level_renderer(layer)
174			args = (pen, brush)
175	jan	2394
176			# for point shapes we need to find out the properties
177			# to determine the size. Based on table and field,
178			# we can find out the properties for object - see below.
179			if shapetype == SHAPETYPE_POINT:
180			lc = layer.GetClassification()
181			field = layer.GetClassificationColumn()
182			table = layer.ShapeStore().Table()
183
184	bh	1866	count = 0
185			for index in selected_shapes:
186			count += 1
187			shape = layer.Shape(index)
188	jan	2394
189			# Get the size of the specific property for this
190			# point
191	frank	2514	if shapetype == SHAPETYPE_POINT and field is not None:
192	jan	2394	value = table.ReadValue(shape.ShapeID(), field)
193			group = lc.FindGroup(value)
194			size = group.GetProperties().GetSize()
195			args = (pen, brush, size)
196
197	bh	1866	if useraw:
198			data = shape.RawData()
199			else:
200			data = shape.Points()
201			func(param, data, *args)
202			if count % 500 == 0:
203			yield True
204
205	bh	1593	def layer_shapes(self, layer):
206	bh	144	"""Return the shapeids covered by the region that has to be redrawn
207	bh	6
208	bh	144	Call the layer's ShapesInRegion method to determine the ids so
209			that it can use the quadtree.
210			"""
211			# FIXME: the quad-tree should be built from the projected
212			# coordinates not the lat-long ones because it's not trivial to
213			# determine an appropriate rectangle in lat-long for a given
214			# rectangle in projected coordinates which we have to start from
215			# here.
216			proj = self.map.projection
217			if proj is not None:
218			inverse = proj.Inverse
219			else:
220			inverse = None
221
222			scale = self.scale
223			offx, offy = self.offset
224			xs = []
225			ys = []
226	bh	1866	x, y, width, height = self.region
227	bh	144	for winx, winy in ((x, y), (x + width, y),
228			(x + width, y + height), (x, y + height)):
229			px = (winx - offx) / scale
230			py = -(winy - offy) / scale
231			if inverse:
232			px, py = inverse(px, py)
233			xs.append(px)
234			ys.append(py)
235			left = min(xs)
236			right = max(xs)
237			top = max(ys)
238			bottom = min(ys)
239
240			return layer.ShapesInRegion((left, bottom, right, top))
241
242
243	frank	909	class ExportRenderer(ScreenRenderer):
244	bh	6
245	frank	909	honor_visibility = 1
246	bh	1552
247	bh	1866	def __init__(self, args, *kw):
248			"""Initialize the ExportRenderer.
249
250			In addition to all parameters of the the ScreenRender
251			constructor, this class requires and additional keyword argument
252			destination_region with a tuple (minx, miny, maxx, maxy) giving
253			the region in dc coordinates which is to contain the map.
254			"""
255			self.destination_region = kw["destination_region"]
256			del kw["destination_region"]
257			ScreenRenderer.__init__(self, args, *kw)
258
259			def RenderMap(self, selected_layer, selected_shapes):
260	frank	909	"""Render the map.
261	bh	6
262	frank	909	The rendering device has been specified during initialisation.
263	bh	1866	The device border distance was set in
264			Thuban.UI.viewport.output_transform().
265	bh	1552
266	frank	909	RenderMap renders a frame set (one page frame, one around
267	bh	1866	legend/scalebar and one around the map), the map, the legend and
268			the scalebar on the given DC. The map is rendered with the
269			region displayed in the canvas view, centered on the area
270			available for map display.
271	frank	909	"""
272	bh	1552
273	frank	909	self.selected_layer = selected_layer
274			self.selected_shapes = selected_shapes
275
276	bh	1552	# Get some dimensions
277	bh	1866	llx, lly, urx, ury = self.region
278			mminx, mminy, mmaxx, mmaxy = self.destination_region
279	frank	909
280	bh	1552	# Manipulate the offset to position the map
281	frank	909	offx, offy = self.offset
282			# 1. Shift to corner of map drawing area
283	bh	1552	offx = offx + mminx
284	frank	909	offy = offy + mminy
285
286			# 2. Center the map on the map drawing area:
287	bh	1552	# region identifies the region on the canvas view:
288	frank	909	# center of map drawing area - half the size of region: rendering origin
289			self.shiftx = (mmaxx - mminx)0.5 - (urx - llx)0.5
290			self.shifty = (mmaxy - mminy)0.5 - (ury - lly)0.5
291
292			self.offset = (offx+self.shiftx, offy+self.shifty)
293	bh	2454	self.region = (llx + self.shiftx, lly + self.shifty, urx, ury)
294	frank	909
295			# Draw the map
296			self.dc.BeginDrawing()
297			self.dc.DestroyClippingRegion()
298	bh	1552	self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,
299	frank	909	urx, ury)
300	bh	1866	self.render_map()
301	frank	909	self.dc.EndDrawing()
302
303			# Draw the rest (frames, legend, scalebar)
304			self.dc.BeginDrawing()
305			self.dc.DestroyClippingRegion()
306
307			# Force the font for Legend drawing
308			font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
309			self.dc.SetFont(font)
310
311	bh	1866	self.render_frame()
312			self.render_legend()
313			self.render_scalebar()
314	frank	909	self.dc.EndDrawing()
315
316	bh	1866	def render_frame(self):
317	frank	909	"""Render the frames for map and legend/scalebar."""
318
319			dc = self.dc
320			dc.SetPen(wxBLACK_PEN)
321			dc.SetBrush(wxTRANSPARENT_BRUSH)
322
323			# Dimension stuff
324			width, height = dc.GetSizeTuple()
325	bh	1866	mminx, mminy, mmaxx, mmaxy = self.destination_region
326	frank	909
327			# Page Frame
328			dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)
329	bh	1552
330	frank	909	# Map Frame
331	bh	1866	llx, lly, urx, ury = self.region
332	frank	909	dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)
333	bh	1552
334	frank	909	# Legend Frame
335			dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy)
336
337			dc.DestroyClippingRegion()
338			dc.SetClippingRegion(mmaxx+10,mminy,
339			(width-20) - (mmaxx+10), mmaxy-mminy)
340
341	bh	1866	def render_legend(self):
342	frank	909	"""Render the legend on the Map."""
343
344			previewer = ClassDataPreviewer()
345			dc = self.dc
346			dc.SetPen(wxBLACK_PEN)
347			dc.SetBrush(wxTRANSPARENT_BRUSH)
348
349			# Dimension stuff
350			width, height = dc.GetSizeTuple()
351	bh	1866	mminx, mminy, mmaxx, mmaxy = self.destination_region
352	frank	909	textwidth, textheight = dc.GetTextExtent("0")
353			iconwidth = textheight
354			iconheight = textheight
355			stepy = textheight+3
356			dx = 10
357	bh	1552	posx = mmaxx + 10 + 5 # 10 pix distance mapframe/legend frame,
358	frank	909	# 5 pix inside legend frame
359			posy = mminy + 5 # 5 pix inside legend frame
360	bh	1552
361	frank	909	# Render the legend
362			dc.SetTextForeground(wxBLACK)
363	bh	1866	if self.map.HasLayers():
364			layers = self.map.Layers()[:]
365	frank	1324	layers.reverse()
366			for l in layers:
367	frank	909	if l.Visible():
368			# Render title
369			dc.DrawText(l.Title(), posx, posy)
370			posy+=stepy
371	jonathan	1298	if l.HasClassification():
372			# Render classification
373			clazz = l.GetClassification()
374			shapeType = l.ShapeType()
375			for g in clazz:
376			if g.IsVisible():
377	bh	1552	previewer.Draw(dc,
378			wxRect(posx+dx, posy,
379			iconwidth, iconheight),
380	jonathan	1298	g.GetProperties(), shapeType)
381	bh	1552	dc.DrawText(g.GetDisplayText(),
382	jonathan	1298	posx+2*dx+iconwidth, posy)
383			posy+=stepy
384	bh	1552
385	bh	1866	def render_scalebar(self):
386	frank	909	"""Render the scalebar."""
387
388	bh	1866	scalebar = ScaleBar(self.map)
389	frank	909
390			# Dimension stuff
391			width, height = self.dc.GetSizeTuple()
392	bh	1866	mminx, mminy, mmaxx, mmaxy = self.destination_region
393	bh	1552
394	frank	909	# Render the scalebar
395	bh	1552	scalebar.DrawScaleBar(self.scale, self.dc,
396	frank	909	(mmaxx+10+5, mmaxy-25),
397			((width-15-5) - (mmaxx+10+5),20)
398			)
399			# 10 pix between map and legend frame, 5 pix inside legend frame
400			# 25 pix from the legend frame bottom line
401			# Width: 15 pix from DC border, 5 pix inside frame, 10, 5 as above
402			# Height: 20
403
404			class PrinterRenderer(ExportRenderer):
405
406			# Printing as well as Export / Screen display only the visible layer.
407			honor_visibility = 1
408
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