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# Copyright (c) 2001, 2002, 2003 by Intevation GmbH |
# Copyright (c) 2001-2004 by Intevation GmbH |
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# Authors: |
# Authors: |
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# Bernhard Herzog <[email protected]> |
# Bernhard Herzog <[email protected]> (2001-2003) |
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# Jonathan Coles <[email protected]> |
# Jonathan Coles <[email protected]> (2003) |
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# Frank Koormann <[email protected]> (2003) |
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# Jan-Oliver Wagner <[email protected]> (2003, 2004) |
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# |
# |
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# This program is free software under the GPL (>=v2) |
# This program is free software under the GPL (>=v2) |
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# Read the file COPYING coming with Thuban for details. |
# Read the file COPYING coming with Thuban for details. |
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__version__ = "$Revision$" |
from __future__ import generators |
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from wxPython.wx import wxPoint, wxPen, wxBrush, wxFont, \ |
__version__ = "$Revision$" |
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wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \ |
# $Source$ |
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wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL |
# $Id$ |
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from wxproj import draw_polygon_shape |
import cStringIO |
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from Thuban import _ |
from Thuban import _ |
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from Thuban.UI.common import * |
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from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \ |
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SHAPETYPE_POINT |
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from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \ |
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ALIGN_LEFT, ALIGN_RIGHT, ALIGN_BASELINE |
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from Thuban.Model.classification import Classification |
from wxPython.wx import wxPoint, wxRect, wxPen, wxBrush, wxFont, \ |
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from Thuban.Model.color import Color |
wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \ |
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wxBLACK_PEN, wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL, \ |
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wxBitmapFromImage, wxImageFromStream, wxBITMAP_TYPE_BMP, \ |
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wxBITMAP_TYPE_JPEG, wxBITMAP_TYPE_PNG, wxBITMAP_TYPE_TIF, wxBITMAP_TYPE_GIF |
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from wxproj import draw_polygon_shape, draw_polygon_init |
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from Thuban.UI.common import Color2wxColour |
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from Thuban.UI.classifier import ClassDataPreviewer |
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from Thuban.UI.scalebar import ScaleBar |
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from Thuban.Model.data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \ |
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SHAPETYPE_POINT, RAW_SHAPEFILE |
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from Thuban.Model.color import Transparent |
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import Thuban.Model.resource |
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from baserenderer import BaseRenderer |
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# Map the strings used for the format parameter of the draw_raster_data |
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# method to the appropriate wxWindows constants |
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raster_format_map = { |
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"BMP": wxBITMAP_TYPE_BMP, |
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"JPEG": wxBITMAP_TYPE_JPEG, |
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"PNG": wxBITMAP_TYPE_PNG, |
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"TIFF": wxBITMAP_TYPE_TIF, |
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"GIF": wxBITMAP_TYPE_GIF, |
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} |
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class MapRenderer(BaseRenderer): |
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class MapRenderer: |
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"""Class to render a map onto a wxDC""" |
"""Class to render a map onto a wxDC""" |
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honor_visibility = 1 |
TRANSPARENT_PEN = wxTRANSPARENT_PEN |
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TRANSPARENT_BRUSH = wxTRANSPARENT_BRUSH |
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def __init__(self, dc, scale, offset, resolution = 72.0, |
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honor_visibility = None): |
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"""Inititalize the renderer. |
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dc -- the wxPython DC to render on |
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scale, offset -- the scale factor and translation to convert |
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between projected coordinates and the DC coordinates |
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resolution -- the assumed resolution of the DC. Used to convert |
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absolute lengths like font sizes to DC coordinates |
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honor_visibility -- boolean. If true, honor the visibility flag |
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of the layers, otherwise draw all layers. If None, use |
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the renderer's default. |
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""" |
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# resolution in pixel/inch |
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assert scale > 0 |
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self.dc = dc |
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self.scale = scale |
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self.offset = offset |
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if honor_visibility is not None: |
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self.honor_visibility = honor_visibility |
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# store the resolution in pixel/point because it's more useful |
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# later. |
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self.resolution = resolution / 72.0 |
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def render_map(self, map): |
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self.map = map |
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for layer in map.Layers(): |
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# if honor_visibility is true, only draw visible layers, |
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# otherwise draw all layers |
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if not self.honor_visibility or layer.Visible(): |
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self.draw_shape_layer(layer) |
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self.draw_label_layer(map.LabelLayer()) |
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def draw_shape_layer(self, layer): |
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scale = self.scale |
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offx, offy = self.offset |
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map_proj = self.map.projection |
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layer_proj = layer.projection |
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shapetype = layer.ShapeType() |
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brush = wxTRANSPARENT_BRUSH |
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pen = wxTRANSPARENT_PEN |
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old_prop = None |
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lc = layer.GetClassification() |
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field = lc.GetField() |
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defaultProps = lc.GetDefaultGroup().GetProperties() |
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for i in self.layer_ids(layer): |
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value = None |
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if field is not None: |
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try: |
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record = layer.table.read_record(i) |
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if record is not None: |
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value = record[field] |
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except: |
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pass |
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# |
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# if the above statements fail 'value' should |
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# be null, at which point this call will |
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# at least retreive the NullData |
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# |
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group = lc.FindGroup(value) |
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if not group.IsVisible(): |
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continue |
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#prop = lc.GetProperties(value) |
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prop = group.GetProperties() |
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else: |
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prop = defaultProps |
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# don't recreate new objects if they are the same as before |
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if prop != old_prop: |
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old_prop = prop |
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if shapetype == SHAPETYPE_ARC: |
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fill = Color.Transparent |
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else: |
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fill = prop.GetFill() |
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if fill is Color.Transparent: |
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brush = wxTRANSPARENT_BRUSH |
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else: |
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color = Color2wxColour(fill) |
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brush = wxBrush(color, wxSOLID) |
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stroke = prop.GetLineColor() |
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stroke_width = prop.GetLineWidth() |
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if stroke is Color.Transparent: |
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pen = wxTRANSPARENT_PEN |
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else: |
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color = Color2wxColour(stroke) |
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pen = wxPen(color, stroke_width, wxSOLID) |
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if shapetype == SHAPETYPE_POINT: |
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self.dc.SetBrush(brush) |
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self.dc.SetPen(pen) |
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self.draw_point_shape(layer, i) |
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else: |
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self.draw_polygon_shape(layer, i, pen, brush) |
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def layer_ids(self, layer): |
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"""Return the shape ids of the given layer that have to be drawn. |
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The default implementation simply returns all ids in the layer. |
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Override in derived classes to be more precise. |
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""" |
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return range(layer.NumShapes()) |
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def draw_polygon_shape(self, layer, index, pen, brush): |
def make_point(self, x, y): |
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offx, offy = self.offset |
return wxPoint(int(round(x)), int(round(y))) |
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draw_polygon_shape(layer.shapefile.cobject(), index, |
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self.dc, pen, brush, |
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self.map.projection, layer.projection, |
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self.scale, -self.scale, offx, offy) |
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def projected_points(self, layer, index): |
def tools_for_property(self, prop): |
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proj = self.map.projection |
fill = prop.GetFill() |
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if proj is not None: |
if fill is Transparent: |
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forward = proj.Forward |
brush = self.TRANSPARENT_BRUSH |
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else: |
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forward = None |
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proj = layer.projection |
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if proj is not None: |
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inverse = proj.Inverse |
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else: |
else: |
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inverse = None |
brush = wxBrush(Color2wxColour(fill), wxSOLID) |
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shape = layer.Shape(index) |
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points = [] |
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scale = self.scale |
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offx, offy = self.offset |
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for x, y in shape.Points(): |
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if inverse: |
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x, y = inverse(x, y) |
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if forward: |
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x, y = forward(x, y) |
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points.append(wxPoint(x * scale + offx, |
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-y * scale + offy)) |
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return points |
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def draw_arc_shape(self, layer, index): |
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points = self.projected_points(layer, index) |
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self.dc.DrawLines(points) |
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def draw_point_shape(self, layer, index): |
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pp = self.projected_points(layer, index) |
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if len(pp) == 0: return # ignore Null Shapes which have no points |
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p = pp[0] |
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radius = self.resolution * 5 |
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self.dc.DrawEllipse(p.x - radius, p.y - radius, 2*radius, 2*radius) |
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def draw_label_layer(self, layer): |
stroke = prop.GetLineColor() |
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scale = self.scale |
if stroke is Transparent: |
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offx, offy = self.offset |
pen = self.TRANSPARENT_PEN |
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else: |
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pen = wxPen(Color2wxColour(stroke), prop.GetLineWidth(), wxSOLID) |
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return pen, brush |
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font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL) |
def low_level_renderer(self, layer): |
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self.dc.SetFont(font) |
"""Override inherited method to provide more efficient renderers |
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map_proj = self.map.projection |
If the underlying data format is not a shapefile or the layer |
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if map_proj is not None: |
contains points shapes, simply use what the inherited method |
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forward = map_proj.Forward |
returns. |
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Otherwise, i.e. for arc and polygon use the more efficient |
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wxproj.draw_polygon_shape and its corresponding parameter |
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created with wxproj.draw_polygon_init. |
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""" |
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if (layer.ShapeStore().RawShapeFormat() == RAW_SHAPEFILE |
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and layer.ShapeType() in (SHAPETYPE_ARC, SHAPETYPE_POLYGON)): |
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offx, offy = self.offset |
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return (True, draw_polygon_shape, |
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draw_polygon_init(layer.ShapeStore().Shapefile(), |
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self.dc, self.map.projection, |
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layer.projection, |
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self.scale, -self.scale, offx, offy)) |
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else: |
else: |
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forward = None |
return BaseRenderer.low_level_renderer(self, layer) |
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for label in layer.Labels(): |
def label_font(self): |
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x = label.x |
return wxFont(int(round(self.resolution * 10)), wxSWISS, wxNORMAL, |
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y = label.y |
wxNORMAL) |
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text = label.text |
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if forward: |
def draw_raster_data(self, data, format = 'BMP'): |
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x, y = forward(x, y) |
stream = cStringIO.StringIO(data) |
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x = x * scale + offx |
image = wxImageFromStream(stream, raster_format_map[format]) |
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y = -y * scale + offy |
bitmap = wxBitmapFromImage(image) |
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width, height = self.dc.GetTextExtent(text) |
self.dc.DrawBitmap(bitmap, 0, 0) |
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if label.halign == ALIGN_LEFT: |
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# nothing to be done |
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pass |
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elif label.halign == ALIGN_RIGHT: |
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x = x - width |
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elif label.halign == ALIGN_CENTER: |
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x = x - width/2 |
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if label.valign == ALIGN_TOP: |
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# nothing to be done |
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pass |
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elif label.valign == ALIGN_BOTTOM: |
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y = y - height |
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elif label.valign == ALIGN_CENTER: |
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y = y - height/2 |
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self.dc.DrawText(text, x, y) |
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class ScreenRenderer(MapRenderer): |
class ScreenRenderer(MapRenderer): |
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# On the screen we want to see only visible layers by default |
# On the screen we want to see only visible layers by default |
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honor_visibility = 1 |
honor_visibility = 1 |
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def RenderMap(self, map, region, selected_layer, selected_shapes): |
def RenderMap(self, selected_layer, selected_shapes): |
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"""Render the map. |
"""Render the map. |
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Only the given region (a tuple in window coordinates as returned |
Only the given region (a tuple in window coordinates as returned |
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shapes given by the ids in selected_shapes in the |
shapes given by the ids in selected_shapes in the |
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selected_layer. |
selected_layer. |
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""" |
""" |
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self.update_region = region |
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self.selected_layer = selected_layer |
self.selected_layer = selected_layer |
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self.selected_shapes = selected_shapes |
self.selected_shapes = selected_shapes |
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self.render_map(map) |
self.render_map() |
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def draw_shape_layer(self, layer): |
def RenderMapIncrementally(self): |
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MapRenderer.draw_shape_layer(self, layer) |
"""Render the map. |
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if layer is self.selected_layer and self.selected_shapes: |
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pen = wxPen(wxBLACK, 3, wxSOLID) |
Only the given region (a tuple in window coordinates as returned |
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brush = wxBrush(wxBLACK, wxCROSS_HATCH) |
by a wxrect's asTuple method) needs to be redrawn. Highlight the |
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shapes given by the ids in selected_shapes in the |
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shapetype = layer.ShapeType() |
selected_layer. |
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if shapetype == SHAPETYPE_POLYGON: |
""" |
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func = self.draw_polygon_shape |
return self.render_map_incrementally() |
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args = (pen, brush) |
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elif shapetype == SHAPETYPE_ARC: |
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func = self.draw_polygon_shape |
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args = (pen, None) |
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elif shapetype == SHAPETYPE_POINT: |
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self.dc.SetBrush(brush) |
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self.dc.SetPen(pen) |
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func = self.draw_point_shape |
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args = () |
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else: |
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raise TypeError(_("Unhandled shape type %s") % shapetype) |
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for index in self.selected_shapes: |
def draw_selection_incrementally(self, layer, selected_shapes): |
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func(layer, index, *args) |
"""Draw the selected shapes in a emphasized way (i.e. |
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with a special pen and brush. |
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The drawing is performed incrementally, that means every |
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n shapes, the user can have interactions with the map. |
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n is currently fixed to 500. |
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layer -- the layer where the shapes belong to. |
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selected_shapes -- a list of the shape-ids representing the |
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selected shapes for the given layer. |
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""" |
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pen = wxPen(wxBLACK, 3, wxSOLID) |
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brush = wxBrush(wxBLACK, wxCROSS_HATCH) |
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shapetype = layer.ShapeType() |
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useraw, func, param = self.low_level_renderer(layer) |
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args = (pen, brush) |
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# for point shapes we need to find out the properties |
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# to determine the size. Based on table and field, |
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# we can find out the properties for object - see below. |
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if shapetype == SHAPETYPE_POINT: |
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lc = layer.GetClassification() |
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field = layer.GetClassificationColumn() |
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table = layer.ShapeStore().Table() |
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count = 0 |
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for index in selected_shapes: |
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count += 1 |
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shape = layer.Shape(index) |
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# Get the size of the specific property for this |
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# point |
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if shapetype == SHAPETYPE_POINT: |
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value = table.ReadValue(shape.ShapeID(), field) |
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group = lc.FindGroup(value) |
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size = group.GetProperties().GetSize() |
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args = (pen, brush, size) |
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def layer_ids(self, layer): |
if useraw: |
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data = shape.RawData() |
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else: |
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data = shape.Points() |
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func(param, data, *args) |
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if count % 500 == 0: |
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yield True |
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def layer_shapes(self, layer): |
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"""Return the shapeids covered by the region that has to be redrawn |
"""Return the shapeids covered by the region that has to be redrawn |
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Call the layer's ShapesInRegion method to determine the ids so |
Call the layer's ShapesInRegion method to determine the ids so |
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offx, offy = self.offset |
offx, offy = self.offset |
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xs = [] |
xs = [] |
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ys = [] |
ys = [] |
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x, y, width, height = self.update_region |
x, y, width, height = self.region |
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for winx, winy in ((x, y), (x + width, y), |
for winx, winy in ((x, y), (x + width, y), |
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(x + width, y + height), (x, y + height)): |
(x + width, y + height), (x, y + height)): |
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px = (winx - offx) / scale |
px = (winx - offx) / scale |
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return layer.ShapesInRegion((left, bottom, right, top)) |
return layer.ShapesInRegion((left, bottom, right, top)) |
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class PrinterRender(MapRenderer): |
class ExportRenderer(ScreenRenderer): |
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honor_visibility = 1 |
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def __init__(self, *args, **kw): |
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"""Initialize the ExportRenderer. |
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In addition to all parameters of the the ScreenRender |
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constructor, this class requires and additional keyword argument |
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destination_region with a tuple (minx, miny, maxx, maxy) giving |
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the region in dc coordinates which is to contain the map. |
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""" |
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self.destination_region = kw["destination_region"] |
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del kw["destination_region"] |
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ScreenRenderer.__init__(self, *args, **kw) |
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def RenderMap(self, selected_layer, selected_shapes): |
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"""Render the map. |
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The rendering device has been specified during initialisation. |
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The device border distance was set in |
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Thuban.UI.viewport.output_transform(). |
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RenderMap renders a frame set (one page frame, one around |
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legend/scalebar and one around the map), the map, the legend and |
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the scalebar on the given DC. The map is rendered with the |
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region displayed in the canvas view, centered on the area |
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available for map display. |
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""" |
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self.selected_layer = selected_layer |
| 252 |
|
self.selected_shapes = selected_shapes |
| 253 |
|
|
| 254 |
|
# Get some dimensions |
| 255 |
|
llx, lly, urx, ury = self.region |
| 256 |
|
mminx, mminy, mmaxx, mmaxy = self.destination_region |
| 257 |
|
|
| 258 |
|
# Manipulate the offset to position the map |
| 259 |
|
offx, offy = self.offset |
| 260 |
|
# 1. Shift to corner of map drawing area |
| 261 |
|
offx = offx + mminx |
| 262 |
|
offy = offy + mminy |
| 263 |
|
|
| 264 |
|
# 2. Center the map on the map drawing area: |
| 265 |
|
# region identifies the region on the canvas view: |
| 266 |
|
# center of map drawing area - half the size of region: rendering origin |
| 267 |
|
self.shiftx = (mmaxx - mminx)*0.5 - (urx - llx)*0.5 |
| 268 |
|
self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5 |
| 269 |
|
|
| 270 |
|
self.offset = (offx+self.shiftx, offy+self.shifty) |
| 271 |
|
|
| 272 |
|
# Draw the map |
| 273 |
|
self.dc.BeginDrawing() |
| 274 |
|
self.dc.DestroyClippingRegion() |
| 275 |
|
self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty, |
| 276 |
|
urx, ury) |
| 277 |
|
self.render_map() |
| 278 |
|
self.dc.EndDrawing() |
| 279 |
|
|
| 280 |
|
# Draw the rest (frames, legend, scalebar) |
| 281 |
|
self.dc.BeginDrawing() |
| 282 |
|
self.dc.DestroyClippingRegion() |
| 283 |
|
|
| 284 |
|
# Force the font for Legend drawing |
| 285 |
|
font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL) |
| 286 |
|
self.dc.SetFont(font) |
| 287 |
|
|
| 288 |
|
self.render_frame() |
| 289 |
|
self.render_legend() |
| 290 |
|
self.render_scalebar() |
| 291 |
|
self.dc.EndDrawing() |
| 292 |
|
|
| 293 |
|
def render_frame(self): |
| 294 |
|
"""Render the frames for map and legend/scalebar.""" |
| 295 |
|
|
| 296 |
|
dc = self.dc |
| 297 |
|
dc.SetPen(wxBLACK_PEN) |
| 298 |
|
dc.SetBrush(wxTRANSPARENT_BRUSH) |
| 299 |
|
|
| 300 |
|
# Dimension stuff |
| 301 |
|
width, height = dc.GetSizeTuple() |
| 302 |
|
mminx, mminy, mmaxx, mmaxy = self.destination_region |
| 303 |
|
|
| 304 |
|
# Page Frame |
| 305 |
|
dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10) |
| 306 |
|
|
| 307 |
|
# Map Frame |
| 308 |
|
llx, lly, urx, ury = self.region |
| 309 |
|
dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury) |
| 310 |
|
|
| 311 |
|
# Legend Frame |
| 312 |
|
dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy) |
| 313 |
|
|
| 314 |
|
dc.DestroyClippingRegion() |
| 315 |
|
dc.SetClippingRegion(mmaxx+10,mminy, |
| 316 |
|
(width-20) - (mmaxx+10), mmaxy-mminy) |
| 317 |
|
|
| 318 |
|
def render_legend(self): |
| 319 |
|
"""Render the legend on the Map.""" |
| 320 |
|
|
| 321 |
|
previewer = ClassDataPreviewer() |
| 322 |
|
dc = self.dc |
| 323 |
|
dc.SetPen(wxBLACK_PEN) |
| 324 |
|
dc.SetBrush(wxTRANSPARENT_BRUSH) |
| 325 |
|
|
| 326 |
|
# Dimension stuff |
| 327 |
|
width, height = dc.GetSizeTuple() |
| 328 |
|
mminx, mminy, mmaxx, mmaxy = self.destination_region |
| 329 |
|
textwidth, textheight = dc.GetTextExtent("0") |
| 330 |
|
iconwidth = textheight |
| 331 |
|
iconheight = textheight |
| 332 |
|
stepy = textheight+3 |
| 333 |
|
dx = 10 |
| 334 |
|
posx = mmaxx + 10 + 5 # 10 pix distance mapframe/legend frame, |
| 335 |
|
# 5 pix inside legend frame |
| 336 |
|
posy = mminy + 5 # 5 pix inside legend frame |
| 337 |
|
|
| 338 |
|
# Render the legend |
| 339 |
|
dc.SetTextForeground(wxBLACK) |
| 340 |
|
if self.map.HasLayers(): |
| 341 |
|
layers = self.map.Layers()[:] |
| 342 |
|
layers.reverse() |
| 343 |
|
for l in layers: |
| 344 |
|
if l.Visible(): |
| 345 |
|
# Render title |
| 346 |
|
dc.DrawText(l.Title(), posx, posy) |
| 347 |
|
posy+=stepy |
| 348 |
|
if l.HasClassification(): |
| 349 |
|
# Render classification |
| 350 |
|
clazz = l.GetClassification() |
| 351 |
|
shapeType = l.ShapeType() |
| 352 |
|
for g in clazz: |
| 353 |
|
if g.IsVisible(): |
| 354 |
|
previewer.Draw(dc, |
| 355 |
|
wxRect(posx+dx, posy, |
| 356 |
|
iconwidth, iconheight), |
| 357 |
|
g.GetProperties(), shapeType) |
| 358 |
|
dc.DrawText(g.GetDisplayText(), |
| 359 |
|
posx+2*dx+iconwidth, posy) |
| 360 |
|
posy+=stepy |
| 361 |
|
|
| 362 |
|
def render_scalebar(self): |
| 363 |
|
"""Render the scalebar.""" |
| 364 |
|
|
| 365 |
|
scalebar = ScaleBar(self.map) |
| 366 |
|
|
| 367 |
|
# Dimension stuff |
| 368 |
|
width, height = self.dc.GetSizeTuple() |
| 369 |
|
mminx, mminy, mmaxx, mmaxy = self.destination_region |
| 370 |
|
|
| 371 |
|
# Render the scalebar |
| 372 |
|
scalebar.DrawScaleBar(self.scale, self.dc, |
| 373 |
|
(mmaxx+10+5, mmaxy-25), |
| 374 |
|
((width-15-5) - (mmaxx+10+5),20) |
| 375 |
|
) |
| 376 |
|
# 10 pix between map and legend frame, 5 pix inside legend frame |
| 377 |
|
# 25 pix from the legend frame bottom line |
| 378 |
|
# Width: 15 pix from DC border, 5 pix inside frame, 10, 5 as above |
| 379 |
|
# Height: 20 |
| 380 |
|
|
| 381 |
# When printing we want to see all layers |
class PrinterRenderer(ExportRenderer): |
| 382 |
honor_visibility = 0 |
|
| 383 |
|
# Printing as well as Export / Screen display only the visible layer. |
| 384 |
|
honor_visibility = 1 |
| 385 |
|
|
|
RenderMap = MapRenderer.render_map |
|
|
|
|
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| 
Revision Log
| 
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