Thuban/UI/renderer.py

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

__version__ = "$Revision$"

import cStringIO

from Thuban import _

from wxPython.wx import wxMemoryDC, wxEmptyBitmap, \
    wxPoint, wxRect, wxPen, wxBrush, wxFont, \
    wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \
    wxBLACK_PEN, wxRED_PEN, wxBLACK, \
    wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL, \
    wxBitmap, wxImageFromBitmap, wxBitmapFromImage, \
    wxImageFromStream, wxBITMAP_TYPE_BMP

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.layer import Layer, RasterLayer
from Thuban.Model.data 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 Transparent
import Thuban.Model.resource

if Thuban.Model.resource.has_gdal_support():
    from gdalwarp import ProjectRasterFile

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
        seenRaster = True

        self.dc.BeginDrawing()

        #
        # This is only a good optimization if there is only one
        # raster layer and the image covers the entire window (as
        # it currently does). We note if there is a raster layer
        # and only begin drawing layers once we have drawn it. 
        # That way we avoid drawing layers that won't be seen.
        #
        if Thuban.Model.resource.has_gdal_support():
            for layer in map.Layers():
                if isinstance(layer, RasterLayer) and layer.Visible():
                    seenRaster = False
                    break

        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():
                if isinstance(layer, Layer) and seenRaster:
                    self.draw_shape_layer(layer)
                elif isinstance(layer, RasterLayer) \
                    and Thuban.Model.resource.has_gdal_support():
                    self.draw_raster_layer(layer)
                    seenRaster = True

        self.draw_label_layer(map.LabelLayer())

        self.dc.EndDrawing()

    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
        old_group = None
        lc = layer.GetClassification()
        field = layer.GetClassificationColumn()
        defaultGroup = lc.GetDefaultGroup()


        if shapetype == SHAPETYPE_POINT:
            draw_func = self.draw_point_shape
            draw_func_param = layer
        else:
            draw_func = draw_polygon_shape
            draw_func_param = self.polygon_render_param(layer)

        table = layer.ShapeStore().Table()
        for i in self.layer_ids(layer):

            if field is None:
                group = defaultGroup
            else:
                record = table.ReadRowAsDict(i)
                assert record is not None
                group = lc.FindGroup(record[field])


            if not group.IsVisible():
                continue


            # don't recreate new objects if they are the same as before
            if group is not old_group:
                old_group = group

                prop = group.GetProperties()

                if prop != old_prop:
                    old_prop = prop

                    if shapetype == SHAPETYPE_ARC:
                        fill = Transparent
                    else:
                        fill = prop.GetFill()


                    if fill is Transparent:
                        brush = wxTRANSPARENT_BRUSH
                    else:
                        color = Color2wxColour(fill)
                        brush = wxBrush(color, wxSOLID)

                    stroke = prop.GetLineColor()
                    stroke_width = prop.GetLineWidth()
                    if stroke is Transparent:
                        pen = wxTRANSPARENT_PEN
                    else:
                        color = Color2wxColour(stroke)
                        pen = wxPen(color, stroke_width, wxSOLID)

            draw_func(draw_func_param, i, pen, brush)

    def draw_raster_layer(self, layer):
        data = None
        offx, offy = self.offset
        width, height = self.dc.GetSizeTuple()

        inProj = ""
        proj = layer.GetProjection()
        if proj is not None:
            for p in proj.GetAllParameters():
                inProj += "+" + p + " "

        outProj = ""
        proj = self.map.GetProjection()
        if proj is not None:
            for p in proj.GetAllParameters():
                outProj += "+" + p + " "

        xmin = (0 - offx) / self.scale
        ymin = (offy - height) / self.scale
        xmax = (width - offx) / self.scale
        ymax = (offy - 0) / self.scale

        try:
            data = ProjectRasterFile(
                layer.GetImageFilename(),
                inProj,
                outProj,
                (xmin, ymin, xmax, ymax), 
                "", (width, height))
        except IOError, (strerr):
            print strerr
        except (AttributeError, ValueError):
            pass
        else:
            if data is not None:
                stream = cStringIO.StringIO(data)
                image = wxImageFromStream(stream, wxBITMAP_TYPE_BMP)
                bitmap = wxBitmapFromImage(image)
                self.dc.DrawBitmap(bitmap, 0, 0)

    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 polygon_render_param(self, layer):
        """Return the low-lever render parameter for the layer"""
        offx, offy = self.offset
        return draw_polygon_init(layer.ShapeStore().Shapefile(), self.dc,
                                 self.map.projection,
                                 layer.projection,
                                 self.scale, -self.scale,
                                 offx, offy)

    def draw_polygon_shape(self, draw_polygon_info, index, pen, brush):
        draw_polygon_shape(draw_polygon_info, index, pen, brush)

    def projected_points(self, layer, index):
        proj = self.map.GetProjection()
        if proj is not None:
            forward = proj.Forward
        else:
            forward = None
        proj = layer.GetProjection()
        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, pen, brush):
        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.SetBrush(brush)
        self.dc.SetPen(pen)
        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:
                offx, offy = self.offset
                renderparam = self.polygon_render_param(layer)
                func = self.draw_polygon_shape
                args = (pen, brush)
            elif shapetype == SHAPETYPE_ARC:
                renderparam = self.polygon_render_param(layer)
                func = self.draw_polygon_shape
                args = (pen, None)
            elif shapetype == SHAPETYPE_POINT:
                renderparam = layer
                func = self.draw_point_shape
                args = (pen, brush)
            else:
                raise TypeError(_("Unhandled shape type %s") % shapetype)

            for index in self.selected_shapes:
                func(renderparam, 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 ExportRenderer(ScreenRenderer):

    honor_visibility = 1
    
    def RenderMap(self, map, region, mapregion, 
                  selected_layer, selected_shapes ):
        """Render the map.

        The rendering device has been specified during initialisation.
        The device border distance was set in Thuban.UI.view.OutputTranform().
        
        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.update_region = region
        self.selected_layer = selected_layer
        self.selected_shapes = selected_shapes

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

        # 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)

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

    def render_frame(self, region):
        """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.mapregion

        # Page Frame
        dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)
        
        # Map Frame
        llx, lly, urx, ury = 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, map):
        """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.mapregion
        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 map.HasLayers():
            layers = 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, map):
        """Render the scalebar."""

        scalebar = ScaleBar(map)

        # Dimension stuff
        width, height = self.dc.GetSizeTuple()
        mminx, mminy, mmaxx, mmaxy = self.mapregion
       
        # 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	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	frank	909	# Frank Koormann <[email protected]>
6	bh	6	#
7			# This program is free software under the GPL (>=v2)
8			# Read the file COPYING coming with Thuban for details.
9
10			__version__ = "$Revision$"
11
12	jonathan	938	import cStringIO
13
14	jonathan	882	from Thuban import _
15
16	frank	909	from wxPython.wx import wxMemoryDC, wxEmptyBitmap, \
17			wxPoint, wxRect, wxPen, wxBrush, wxFont, \
18			wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \
19	jonathan	938	wxBLACK_PEN, wxRED_PEN, wxBLACK, \
20			wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL, \
21			wxBitmap, wxImageFromBitmap, wxBitmapFromImage, \
22			wxImageFromStream, wxBITMAP_TYPE_BMP
23	bh	6
24	jonathan	676	from wxproj import draw_polygon_shape, draw_polygon_init
25	bh	6
26	jonathan	882	from Thuban.UI.common import Color2wxColour
27	frank	909	from Thuban.UI.classifier import ClassDataPreviewer
28			from Thuban.UI.scalebar import ScaleBar
29	jan	374
30	bh	1539	from Thuban.Model.layer import Layer, RasterLayer
31			from Thuban.Model.data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, SHAPETYPE_POINT
32	bh	6	from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \
33			ALIGN_LEFT, ALIGN_RIGHT, ALIGN_BASELINE
34
35	jonathan	394	from Thuban.Model.classification import Classification
36	jonathan	1343	from Thuban.Model.color import Transparent
37	jonathan	1165	import Thuban.Model.resource
38	bh	6
39	jonathan	1234	if Thuban.Model.resource.has_gdal_support():
40			from gdalwarp import ProjectRasterFile
41
42	bh	6	class MapRenderer:
43
44			"""Class to render a map onto a wxDC"""
45
46			honor_visibility = 1
47
48			def __init__(self, dc, scale, offset, resolution = 72.0,
49			honor_visibility = None):
50			"""Inititalize the renderer.
51
52			dc -- the wxPython DC to render on
53			scale, offset -- the scale factor and translation to convert
54			between projected coordinates and the DC coordinates
55
56			resolution -- the assumed resolution of the DC. Used to convert
57			absolute lengths like font sizes to DC coordinates
58
59			honor_visibility -- boolean. If true, honor the visibility flag
60			of the layers, otherwise draw all layers. If None, use
61			the renderer's default.
62			"""
63			# resolution in pixel/inch
64	jonathan	574
65	bh	6	self.dc = dc
66			self.scale = scale
67			self.offset = offset
68			if honor_visibility is not None:
69			self.honor_visibility = honor_visibility
70			# store the resolution in pixel/point because it's more useful
71			# later.
72			self.resolution = resolution / 72.0
73
74			def render_map(self, map):
75			self.map = map
76	jonathan	938	seenRaster = True
77
78	jonathan	1467	self.dc.BeginDrawing()
79	jonathan	965
80	jonathan	938	#
81			# This is only a good optimization if there is only one
82			# raster layer and the image covers the entire window (as
83	jonathan	1165	# it currently does). We note if there is a raster layer
84			# and only begin drawing layers once we have drawn it.
85			# That way we avoid drawing layers that won't be seen.
86	jonathan	938	#
87	jonathan	1234	if Thuban.Model.resource.has_gdal_support():
88			for layer in map.Layers():
89			if isinstance(layer, RasterLayer) and layer.Visible():
90			seenRaster = False
91			break
92	jonathan	938
93			for layer in map.Layers():
94	bh	6	# if honor_visibility is true, only draw visible layers,
95			# otherwise draw all layers
96			if not self.honor_visibility or layer.Visible():
97	jonathan	938	if isinstance(layer, Layer) and seenRaster:
98			self.draw_shape_layer(layer)
99	jonathan	1165	elif isinstance(layer, RasterLayer) \
100			and Thuban.Model.resource.has_gdal_support():
101	jonathan	938	self.draw_raster_layer(layer)
102			seenRaster = True
103
104	bh	6	self.draw_label_layer(map.LabelLayer())
105
106	jonathan	1467	self.dc.EndDrawing()
107
108	bh	6	def draw_shape_layer(self, layer):
109			scale = self.scale
110			offx, offy = self.offset
111
112			map_proj = self.map.projection
113			layer_proj = layer.projection
114
115			shapetype = layer.ShapeType()
116
117	jonathan	362	brush = wxTRANSPARENT_BRUSH
118			pen = wxTRANSPARENT_PEN
119
120			old_prop = None
121	jonathan	798	old_group = None
122	jonathan	468	lc = layer.GetClassification()
123	bh	1452	field = layer.GetClassificationColumn()
124	jonathan	798	defaultGroup = lc.GetDefaultGroup()
125	jonathan	468
126	jonathan	676
127	jonathan	1467
128	jonathan	798	if shapetype == SHAPETYPE_POINT:
129	bh	1419	draw_func = self.draw_point_shape
130			draw_func_param = layer
131	jonathan	798	else:
132	bh	1419	draw_func = draw_polygon_shape
133			draw_func_param = self.polygon_render_param(layer)
134	bh	1219
135			table = layer.ShapeStore().Table()
136	jonathan	362	for i in self.layer_ids(layer):
137
138	jonathan	798	if field is None:
139			group = defaultGroup
140	jonathan	468	else:
141	bh	1219	record = table.ReadRowAsDict(i)
142	jonathan	798	assert record is not None
143			group = lc.FindGroup(record[field])
144	jonathan	362
145	jonathan	642
146			if not group.IsVisible():
147			continue
148
149	jonathan	676
150	jonathan	442	# don't recreate new objects if they are the same as before
151	jonathan	798	if group is not old_group:
152			old_group = group
153	jonathan	362
154	jonathan	798	prop = group.GetProperties()
155	jonathan	676
156	jonathan	798	if prop != old_prop:
157			old_prop = prop
158	bh	686
159	jonathan	798	if shapetype == SHAPETYPE_ARC:
160	jonathan	1343	fill = Transparent
161	jonathan	798	else:
162			fill = prop.GetFill()
163	bh	686
164	jonathan	676
165	jonathan	1343	if fill is Transparent:
166	jonathan	798	brush = wxTRANSPARENT_BRUSH
167			else:
168			color = Color2wxColour(fill)
169			brush = wxBrush(color, wxSOLID)
170	bh	686
171	jonathan	798	stroke = prop.GetLineColor()
172			stroke_width = prop.GetLineWidth()
173	jonathan	1343	if stroke is Transparent:
174	jonathan	798	pen = wxTRANSPARENT_PEN
175			else:
176			color = Color2wxColour(stroke)
177			pen = wxPen(color, stroke_width, wxSOLID)
178	bh	6
179	bh	1419	draw_func(draw_func_param, i, pen, brush)
180	jonathan	798
181	jonathan	938	def draw_raster_layer(self, layer):
182			data = None
183			offx, offy = self.offset
184			width, height = self.dc.GetSizeTuple()
185
186			inProj = ""
187			proj = layer.GetProjection()
188			if proj is not None:
189			for p in proj.GetAllParameters():
190			inProj += "+" + p + " "
191
192			outProj = ""
193			proj = self.map.GetProjection()
194			if proj is not None:
195			for p in proj.GetAllParameters():
196			outProj += "+" + p + " "
197
198			xmin = (0 - offx) / self.scale
199			ymin = (offy - height) / self.scale
200			xmax = (width - offx) / self.scale
201			ymax = (offy - 0) / self.scale
202
203			try:
204			data = ProjectRasterFile(
205			layer.GetImageFilename(),
206			inProj,
207			outProj,
208	jonathan	1103	(xmin, ymin, xmax, ymax),
209			"", (width, height))
210	jonathan	965	except IOError, (strerr):
211			print strerr
212			except (AttributeError, ValueError):
213	jonathan	938	pass
214			else:
215			if data is not None:
216			stream = cStringIO.StringIO(data)
217			image = wxImageFromStream(stream, wxBITMAP_TYPE_BMP)
218			bitmap = wxBitmapFromImage(image)
219			self.dc.DrawBitmap(bitmap, 0, 0)
220
221	bh	144	def layer_ids(self, layer):
222			"""Return the shape ids of the given layer that have to be drawn.
223	bh	686
224	bh	144	The default implementation simply returns all ids in the layer.
225			Override in derived classes to be more precise.
226			"""
227			return range(layer.NumShapes())
228
229	bh	686	def polygon_render_param(self, layer):
230			"""Return the low-lever render parameter for the layer"""
231			offx, offy = self.offset
232	bh	1219	return draw_polygon_init(layer.ShapeStore().Shapefile(), self.dc,
233	bh	686	self.map.projection,
234			layer.projection,
235			self.scale, -self.scale,
236			offx, offy)
237	bh	6
238	bh	686	def draw_polygon_shape(self, draw_polygon_info, index, pen, brush):
239			draw_polygon_shape(draw_polygon_info, index, pen, brush)
240
241	bh	6	def projected_points(self, layer, index):
242	jonathan	798	proj = self.map.GetProjection()
243	bh	6	if proj is not None:
244			forward = proj.Forward
245			else:
246			forward = None
247	jonathan	798	proj = layer.GetProjection()
248	bh	6	if proj is not None:
249			inverse = proj.Inverse
250			else:
251			inverse = None
252			shape = layer.Shape(index)
253			points = []
254			scale = self.scale
255			offx, offy = self.offset
256			for x, y in shape.Points():
257			if inverse:
258			x, y = inverse(x, y)
259			if forward:
260			x, y = forward(x, y)
261			points.append(wxPoint(x * scale + offx,
262			-y * scale + offy))
263			return points
264
265			def draw_arc_shape(self, layer, index):
266			points = self.projected_points(layer, index)
267			self.dc.DrawLines(points)
268
269	bh	1419	def draw_point_shape(self, layer, index, pen, brush):
270	jonathan	588	pp = self.projected_points(layer, index)
271
272			if len(pp) == 0: return # ignore Null Shapes which have no points
273
274			p = pp[0]
275	bh	6	radius = self.resolution * 5
276	bh	1419	self.dc.SetBrush(brush)
277			self.dc.SetPen(pen)
278	bh	6	self.dc.DrawEllipse(p.x - radius, p.y - radius, 2radius, 2radius)
279
280			def draw_label_layer(self, layer):
281			scale = self.scale
282			offx, offy = self.offset
283
284			font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
285			self.dc.SetFont(font)
286
287			map_proj = self.map.projection
288			if map_proj is not None:
289			forward = map_proj.Forward
290			else:
291			forward = None
292
293			for label in layer.Labels():
294			x = label.x
295			y = label.y
296			text = label.text
297			if forward:
298			x, y = forward(x, y)
299			x = x * scale + offx
300			y = -y * scale + offy
301			width, height = self.dc.GetTextExtent(text)
302			if label.halign == ALIGN_LEFT:
303			# nothing to be done
304			pass
305			elif label.halign == ALIGN_RIGHT:
306			x = x - width
307			elif label.halign == ALIGN_CENTER:
308			x = x - width/2
309			if label.valign == ALIGN_TOP:
310			# nothing to be done
311			pass
312			elif label.valign == ALIGN_BOTTOM:
313			y = y - height
314			elif label.valign == ALIGN_CENTER:
315			y = y - height/2
316			self.dc.DrawText(text, x, y)
317
318
319			class ScreenRenderer(MapRenderer):
320
321			# On the screen we want to see only visible layers by default
322			honor_visibility = 1
323
324	bh	535	def RenderMap(self, map, region, selected_layer, selected_shapes):
325	bh	144	"""Render the map.
326
327	bh	148	Only the given region (a tuple in window coordinates as returned
328			by a wxrect's asTuple method) needs to be redrawn. Highlight the
329	bh	535	shapes given by the ids in selected_shapes in the
330			selected_layer.
331	bh	144	"""
332			self.update_region = region
333	bh	6	self.selected_layer = selected_layer
334	bh	535	self.selected_shapes = selected_shapes
335	bh	6	self.render_map(map)
336
337			def draw_shape_layer(self, layer):
338			MapRenderer.draw_shape_layer(self, layer)
339	bh	535	if layer is self.selected_layer and self.selected_shapes:
340	bh	6	pen = wxPen(wxBLACK, 3, wxSOLID)
341			brush = wxBrush(wxBLACK, wxCROSS_HATCH)
342	bh	535
343	bh	6	shapetype = layer.ShapeType()
344			if shapetype == SHAPETYPE_POLYGON:
345	bh	686	offx, offy = self.offset
346			renderparam = self.polygon_render_param(layer)
347	bh	535	func = self.draw_polygon_shape
348			args = (pen, brush)
349	bh	290	elif shapetype == SHAPETYPE_ARC:
350	bh	686	renderparam = self.polygon_render_param(layer)
351	bh	535	func = self.draw_polygon_shape
352			args = (pen, None)
353			elif shapetype == SHAPETYPE_POINT:
354	bh	686	renderparam = layer
355	bh	535	func = self.draw_point_shape
356	jonathan	1467	args = (pen, brush)
357	bh	535	else:
358			raise TypeError(_("Unhandled shape type %s") % shapetype)
359	bh	6
360	bh	535	for index in self.selected_shapes:
361	bh	686	func(renderparam, index, *args)
362	bh	535
363	bh	144	def layer_ids(self, layer):
364			"""Return the shapeids covered by the region that has to be redrawn
365	bh	6
366	bh	144	Call the layer's ShapesInRegion method to determine the ids so
367			that it can use the quadtree.
368			"""
369			# FIXME: the quad-tree should be built from the projected
370			# coordinates not the lat-long ones because it's not trivial to
371			# determine an appropriate rectangle in lat-long for a given
372			# rectangle in projected coordinates which we have to start from
373			# here.
374			proj = self.map.projection
375			if proj is not None:
376			inverse = proj.Inverse
377			else:
378			inverse = None
379
380			scale = self.scale
381			offx, offy = self.offset
382			xs = []
383			ys = []
384	bh	148	x, y, width, height = self.update_region
385	bh	144	for winx, winy in ((x, y), (x + width, y),
386			(x + width, y + height), (x, y + height)):
387			px = (winx - offx) / scale
388			py = -(winy - offy) / scale
389			if inverse:
390			px, py = inverse(px, py)
391			xs.append(px)
392			ys.append(py)
393			left = min(xs)
394			right = max(xs)
395			top = max(ys)
396			bottom = min(ys)
397
398			return layer.ShapesInRegion((left, bottom, right, top))
399
400
401	frank	909	class ExportRenderer(ScreenRenderer):
402	bh	6
403	frank	909	honor_visibility = 1
404
405			def RenderMap(self, map, region, mapregion,
406			selected_layer, selected_shapes ):
407			"""Render the map.
408	bh	6
409	frank	909	The rendering device has been specified during initialisation.
410			The device border distance was set in Thuban.UI.view.OutputTranform().
411
412			RenderMap renders a frame set (one page frame, one around
413			legend/scalebar and one around the map), the map, the legend and the
414			scalebar on the given DC. The map is rendered with the region displayed
415			in the canvas view, centered on the area available for map display.
416			"""
417
418			self.update_region = region
419			self.selected_layer = selected_layer
420			self.selected_shapes = selected_shapes
421
422			# Get some dimensions
423			llx, lly, urx, ury = region
424			self.mapregion = mapregion
425			mminx, mminy, mmaxx, mmaxy = self.mapregion
426
427			# Manipulate the offset to position the map
428			offx, offy = self.offset
429			# 1. Shift to corner of map drawing area
430			offx = offx + mminx
431			offy = offy + mminy
432
433			# 2. Center the map on the map drawing area:
434			# region identifies the region on the canvas view:
435			# center of map drawing area - half the size of region: rendering origin
436			self.shiftx = (mmaxx - mminx)0.5 - (urx - llx)0.5
437			self.shifty = (mmaxy - mminy)0.5 - (ury - lly)0.5
438
439			self.offset = (offx+self.shiftx, offy+self.shifty)
440
441			# Draw the map
442			self.dc.BeginDrawing()
443			self.dc.DestroyClippingRegion()
444			self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,
445			urx, ury)
446			self.render_map(map)
447			self.dc.EndDrawing()
448
449			# Draw the rest (frames, legend, scalebar)
450			self.dc.BeginDrawing()
451			self.dc.DestroyClippingRegion()
452
453			# Force the font for Legend drawing
454			font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
455			self.dc.SetFont(font)
456
457			self.render_frame(region)
458			self.render_legend(map)
459			self.render_scalebar(map)
460			self.dc.EndDrawing()
461
462			def render_frame(self, region):
463			"""Render the frames for map and legend/scalebar."""
464
465			dc = self.dc
466			dc.SetPen(wxBLACK_PEN)
467			dc.SetBrush(wxTRANSPARENT_BRUSH)
468
469			# Dimension stuff
470			width, height = dc.GetSizeTuple()
471			mminx, mminy, mmaxx, mmaxy = self.mapregion
472
473			# Page Frame
474			dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)
475
476			# Map Frame
477			llx, lly, urx, ury = region
478			dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)
479
480			# Legend Frame
481			dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy)
482
483			dc.DestroyClippingRegion()
484			dc.SetClippingRegion(mmaxx+10,mminy,
485			(width-20) - (mmaxx+10), mmaxy-mminy)
486
487			def render_legend(self, map):
488			"""Render the legend on the Map."""
489
490			previewer = ClassDataPreviewer()
491			dc = self.dc
492			dc.SetPen(wxBLACK_PEN)
493			dc.SetBrush(wxTRANSPARENT_BRUSH)
494
495			# Dimension stuff
496			width, height = dc.GetSizeTuple()
497			mminx, mminy, mmaxx, mmaxy = self.mapregion
498			textwidth, textheight = dc.GetTextExtent("0")
499			iconwidth = textheight
500			iconheight = textheight
501			stepy = textheight+3
502			dx = 10
503			posx = mmaxx + 10 + 5 # 10 pix distance mapframe/legend frame,
504			# 5 pix inside legend frame
505			posy = mminy + 5 # 5 pix inside legend frame
506
507			# Render the legend
508			dc.SetTextForeground(wxBLACK)
509			if map.HasLayers():
510	frank	1324	layers = map.Layers()
511			layers.reverse()
512			for l in layers:
513	frank	909	if l.Visible():
514			# Render title
515			dc.DrawText(l.Title(), posx, posy)
516			posy+=stepy
517	jonathan	1298	if l.HasClassification():
518			# Render classification
519			clazz = l.GetClassification()
520			shapeType = l.ShapeType()
521			for g in clazz:
522			if g.IsVisible():
523			previewer.Draw(dc,
524			wxRect(posx+dx, posy,
525			iconwidth, iconheight),
526			g.GetProperties(), shapeType)
527			dc.DrawText(g.GetDisplayText(),
528			posx+2*dx+iconwidth, posy)
529			posy+=stepy
530	frank	909
531			def render_scalebar(self, map):
532			"""Render the scalebar."""
533
534			scalebar = ScaleBar(map)
535
536			# Dimension stuff
537			width, height = self.dc.GetSizeTuple()
538			mminx, mminy, mmaxx, mmaxy = self.mapregion
539
540			# Render the scalebar
541			scalebar.DrawScaleBar(self.scale, self.dc,
542			(mmaxx+10+5, mmaxy-25),
543			((width-15-5) - (mmaxx+10+5),20)
544			)
545			# 10 pix between map and legend frame, 5 pix inside legend frame
546			# 25 pix from the legend frame bottom line
547			# Width: 15 pix from DC border, 5 pix inside frame, 10, 5 as above
548			# Height: 20
549
550			class PrinterRenderer(ExportRenderer):
551
552			# Printing as well as Export / Screen display only the visible layer.
553			honor_visibility = 1
554
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svn:keywords	Author Date Id Revision