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, \
     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

        if self.scale == 0:
            return

        #
        # 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())

    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.GetClassificationField()
        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.BeginDrawing()
                self.dc.DrawBitmap(bitmap, 0, 0)
                self.dc.EndDrawing()

    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
                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(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	jonathan	938	from Thuban.Model.layer import Layer, RasterLayer, \
31			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	965	if self.scale == 0:
79			return
80
81	jonathan	938	#
82			# This is only a good optimization if there is only one
83			# raster layer and the image covers the entire window (as
84	jonathan	1165	# it currently does). We note if there is a raster layer
85			# and only begin drawing layers once we have drawn it.
86			# That way we avoid drawing layers that won't be seen.
87	jonathan	938	#
88	jonathan	1234	if Thuban.Model.resource.has_gdal_support():
89			for layer in map.Layers():
90			if isinstance(layer, RasterLayer) and layer.Visible():
91			seenRaster = False
92			break
93	jonathan	938
94			for layer in map.Layers():
95	bh	6	# if honor_visibility is true, only draw visible layers,
96			# otherwise draw all layers
97			if not self.honor_visibility or layer.Visible():
98	jonathan	938	if isinstance(layer, Layer) and seenRaster:
99			self.draw_shape_layer(layer)
100	jonathan	1165	elif isinstance(layer, RasterLayer) \
101			and Thuban.Model.resource.has_gdal_support():
102	jonathan	938	self.draw_raster_layer(layer)
103			seenRaster = True
104
105	bh	6	self.draw_label_layer(map.LabelLayer())
106
107			def draw_shape_layer(self, layer):
108			scale = self.scale
109			offx, offy = self.offset
110
111			map_proj = self.map.projection
112			layer_proj = layer.projection
113
114			shapetype = layer.ShapeType()
115
116	jonathan	362	brush = wxTRANSPARENT_BRUSH
117			pen = wxTRANSPARENT_PEN
118
119			old_prop = None
120	jonathan	798	old_group = None
121	jonathan	468	lc = layer.GetClassification()
122	jonathan	1434	field = layer.GetClassificationField()
123	jonathan	798	defaultGroup = lc.GetDefaultGroup()
124	jonathan	468
125	jonathan	676
126	jonathan	798	if shapetype == SHAPETYPE_POINT:
127	bh	1419	draw_func = self.draw_point_shape
128			draw_func_param = layer
129	jonathan	798	else:
130	bh	1419	draw_func = draw_polygon_shape
131			draw_func_param = self.polygon_render_param(layer)
132	bh	1219
133			table = layer.ShapeStore().Table()
134	jonathan	362	for i in self.layer_ids(layer):
135
136	jonathan	798	if field is None:
137			group = defaultGroup
138	jonathan	468	else:
139	bh	1219	record = table.ReadRowAsDict(i)
140	jonathan	798	assert record is not None
141			group = lc.FindGroup(record[field])
142	jonathan	362
143	jonathan	642
144			if not group.IsVisible():
145			continue
146
147	jonathan	676
148	jonathan	442	# don't recreate new objects if they are the same as before
149	jonathan	798	if group is not old_group:
150			old_group = group
151	jonathan	362
152	jonathan	798	prop = group.GetProperties()
153	jonathan	676
154	jonathan	798	if prop != old_prop:
155			old_prop = prop
156	bh	686
157	jonathan	798	if shapetype == SHAPETYPE_ARC:
158	jonathan	1343	fill = Transparent
159	jonathan	798	else:
160			fill = prop.GetFill()
161	bh	686
162	jonathan	676
163	jonathan	1343	if fill is Transparent:
164	jonathan	798	brush = wxTRANSPARENT_BRUSH
165			else:
166			color = Color2wxColour(fill)
167			brush = wxBrush(color, wxSOLID)
168	bh	686
169	jonathan	798	stroke = prop.GetLineColor()
170			stroke_width = prop.GetLineWidth()
171	jonathan	1343	if stroke is Transparent:
172	jonathan	798	pen = wxTRANSPARENT_PEN
173			else:
174			color = Color2wxColour(stroke)
175			pen = wxPen(color, stroke_width, wxSOLID)
176	bh	6
177	bh	1419	draw_func(draw_func_param, i, pen, brush)
178	jonathan	798
179	jonathan	938	def draw_raster_layer(self, layer):
180			data = None
181			offx, offy = self.offset
182			width, height = self.dc.GetSizeTuple()
183
184			inProj = ""
185			proj = layer.GetProjection()
186			if proj is not None:
187			for p in proj.GetAllParameters():
188			inProj += "+" + p + " "
189
190			outProj = ""
191			proj = self.map.GetProjection()
192			if proj is not None:
193			for p in proj.GetAllParameters():
194			outProj += "+" + p + " "
195
196			xmin = (0 - offx) / self.scale
197			ymin = (offy - height) / self.scale
198			xmax = (width - offx) / self.scale
199			ymax = (offy - 0) / self.scale
200
201			try:
202			data = ProjectRasterFile(
203			layer.GetImageFilename(),
204			inProj,
205			outProj,
206	jonathan	1103	(xmin, ymin, xmax, ymax),
207			"", (width, height))
208	jonathan	965	except IOError, (strerr):
209			print strerr
210			except (AttributeError, ValueError):
211	jonathan	938	pass
212			else:
213			if data is not None:
214			stream = cStringIO.StringIO(data)
215			image = wxImageFromStream(stream, wxBITMAP_TYPE_BMP)
216			bitmap = wxBitmapFromImage(image)
217			self.dc.BeginDrawing()
218			self.dc.DrawBitmap(bitmap, 0, 0)
219			self.dc.EndDrawing()
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	6	self.dc.SetBrush(brush)
356			self.dc.SetPen(pen)
357	bh	535	func = self.draw_point_shape
358			args = ()
359			else:
360			raise TypeError(_("Unhandled shape type %s") % shapetype)
361	bh	6
362	bh	535	for index in self.selected_shapes:
363	bh	686	func(renderparam, index, *args)
364	bh	535
365	bh	686
366	bh	144	def layer_ids(self, layer):
367			"""Return the shapeids covered by the region that has to be redrawn
368	bh	6
369	bh	144	Call the layer's ShapesInRegion method to determine the ids so
370			that it can use the quadtree.
371			"""
372			# FIXME: the quad-tree should be built from the projected
373			# coordinates not the lat-long ones because it's not trivial to
374			# determine an appropriate rectangle in lat-long for a given
375			# rectangle in projected coordinates which we have to start from
376			# here.
377			proj = self.map.projection
378			if proj is not None:
379			inverse = proj.Inverse
380			else:
381			inverse = None
382
383			scale = self.scale
384			offx, offy = self.offset
385			xs = []
386			ys = []
387	bh	148	x, y, width, height = self.update_region
388	bh	144	for winx, winy in ((x, y), (x + width, y),
389			(x + width, y + height), (x, y + height)):
390			px = (winx - offx) / scale
391			py = -(winy - offy) / scale
392			if inverse:
393			px, py = inverse(px, py)
394			xs.append(px)
395			ys.append(py)
396			left = min(xs)
397			right = max(xs)
398			top = max(ys)
399			bottom = min(ys)
400
401			return layer.ShapesInRegion((left, bottom, right, top))
402
403
404	frank	909	class ExportRenderer(ScreenRenderer):
405	bh	6
406	frank	909	honor_visibility = 1
407
408			def RenderMap(self, map, region, mapregion,
409			selected_layer, selected_shapes ):
410			"""Render the map.
411	bh	6
412	frank	909	The rendering device has been specified during initialisation.
413			The device border distance was set in Thuban.UI.view.OutputTranform().
414
415			RenderMap renders a frame set (one page frame, one around
416			legend/scalebar and one around the map), the map, the legend and the
417			scalebar on the given DC. The map is rendered with the region displayed
418			in the canvas view, centered on the area available for map display.
419			"""
420
421			self.update_region = region
422			self.selected_layer = selected_layer
423			self.selected_shapes = selected_shapes
424
425			# Get some dimensions
426			llx, lly, urx, ury = region
427			self.mapregion = mapregion
428			mminx, mminy, mmaxx, mmaxy = self.mapregion
429
430			# Manipulate the offset to position the map
431			offx, offy = self.offset
432			# 1. Shift to corner of map drawing area
433			offx = offx + mminx
434			offy = offy + mminy
435
436			# 2. Center the map on the map drawing area:
437			# region identifies the region on the canvas view:
438			# center of map drawing area - half the size of region: rendering origin
439			self.shiftx = (mmaxx - mminx)0.5 - (urx - llx)0.5
440			self.shifty = (mmaxy - mminy)0.5 - (ury - lly)0.5
441
442			self.offset = (offx+self.shiftx, offy+self.shifty)
443
444			# Draw the map
445			self.dc.BeginDrawing()
446			self.dc.DestroyClippingRegion()
447			self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,
448			urx, ury)
449			self.render_map(map)
450			self.dc.EndDrawing()
451
452			# Draw the rest (frames, legend, scalebar)
453			self.dc.BeginDrawing()
454			self.dc.DestroyClippingRegion()
455
456			# Force the font for Legend drawing
457			font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
458			self.dc.SetFont(font)
459
460			self.render_frame(region)
461			self.render_legend(map)
462			self.render_scalebar(map)
463			self.dc.EndDrawing()
464
465			def render_frame(self, region):
466			"""Render the frames for map and legend/scalebar."""
467
468			dc = self.dc
469			dc.SetPen(wxBLACK_PEN)
470			dc.SetBrush(wxTRANSPARENT_BRUSH)
471
472			# Dimension stuff
473			width, height = dc.GetSizeTuple()
474			mminx, mminy, mmaxx, mmaxy = self.mapregion
475
476			# Page Frame
477			dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)
478
479			# Map Frame
480			llx, lly, urx, ury = region
481			dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)
482
483			# Legend Frame
484			dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy)
485
486			dc.DestroyClippingRegion()
487			dc.SetClippingRegion(mmaxx+10,mminy,
488			(width-20) - (mmaxx+10), mmaxy-mminy)
489
490			def render_legend(self, map):
491			"""Render the legend on the Map."""
492
493			previewer = ClassDataPreviewer()
494			dc = self.dc
495			dc.SetPen(wxBLACK_PEN)
496			dc.SetBrush(wxTRANSPARENT_BRUSH)
497
498			# Dimension stuff
499			width, height = dc.GetSizeTuple()
500			mminx, mminy, mmaxx, mmaxy = self.mapregion
501			textwidth, textheight = dc.GetTextExtent("0")
502			iconwidth = textheight
503			iconheight = textheight
504			stepy = textheight+3
505			dx = 10
506			posx = mmaxx + 10 + 5 # 10 pix distance mapframe/legend frame,
507			# 5 pix inside legend frame
508			posy = mminy + 5 # 5 pix inside legend frame
509
510			# Render the legend
511			dc.SetTextForeground(wxBLACK)
512			if map.HasLayers():
513	frank	1324	layers = map.Layers()
514			layers.reverse()
515			for l in layers:
516	frank	909	if l.Visible():
517			# Render title
518			dc.DrawText(l.Title(), posx, posy)
519			posy+=stepy
520	jonathan	1298	if l.HasClassification():
521			# Render classification
522			clazz = l.GetClassification()
523			shapeType = l.ShapeType()
524			for g in clazz:
525			if g.IsVisible():
526			previewer.Draw(dc,
527			wxRect(posx+dx, posy,
528			iconwidth, iconheight),
529			g.GetProperties(), shapeType)
530			dc.DrawText(g.GetDisplayText(),
531			posx+2*dx+iconwidth, posy)
532			posy+=stepy
533	frank	909
534			def render_scalebar(self, map):
535			"""Render the scalebar."""
536
537			scalebar = ScaleBar(map)
538
539			# Dimension stuff
540			width, height = self.dc.GetSizeTuple()
541			mminx, mminy, mmaxx, mmaxy = self.mapregion
542
543			# Render the scalebar
544			scalebar.DrawScaleBar(self.scale, self.dc,
545			(mmaxx+10+5, mmaxy-25),
546			((width-15-5) - (mmaxx+10+5),20)
547			)
548			# 10 pix between map and legend frame, 5 pix inside legend frame
549			# 25 pix from the legend frame bottom line
550			# Width: 15 pix from DC border, 5 pix inside frame, 10, 5 as above
551			# Height: 20
552
553			class PrinterRenderer(ExportRenderer):
554
555			# Printing as well as Export / Screen display only the visible layer.
556			honor_visibility = 1
557
Name	Value
svn:eol-style	native
svn:keywords	Author Date Id Revision