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# Copyright (c) 2001-2004 by Intevation GmbH |
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# Authors: |
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# Bernhard Herzog <[email protected]> (2001-2003) |
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# 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) |
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# Read the file COPYING coming with Thuban for details. |
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|
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from __future__ import generators |
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|
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__version__ = "$Revision$" |
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# $Source$ |
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# $Id$ |
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|
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import cStringIO |
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|
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import array |
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|
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import traceback |
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|
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from Thuban import _ |
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|
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from wxPython.wx import wxPoint, wxRect, wxPen, wxBrush, wxFont, \ |
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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, \ |
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wxBITMAP_TYPE_GIF, wxEmptyImage, wxMask, wxBitmapFromBits |
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|
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from wxproj import draw_polygon_shape, draw_polygon_init |
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|
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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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|
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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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|
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from Thuban.Model.color import Transparent |
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import Thuban.Model.resource |
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|
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from baserenderer import BaseRenderer |
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|
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from math import floor |
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|
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from types import StringType |
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|
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from Thuban.version import versions |
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|
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if Thuban.Model.resource.has_gdal_support(): |
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from gdalwarp import ProjectRasterFile |
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|
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|
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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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|
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class MapRenderer(BaseRenderer): |
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|
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"""Class to render a map onto a wxDC""" |
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|
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TRANSPARENT_PEN = wxTRANSPARENT_PEN |
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TRANSPARENT_BRUSH = wxTRANSPARENT_BRUSH |
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|
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def make_point(self, x, y): |
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return wxPoint(int(round(x)), int(round(y))) |
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|
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def tools_for_property(self, prop): |
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fill = prop.GetFill() |
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if fill is Transparent: |
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brush = self.TRANSPARENT_BRUSH |
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else: |
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brush = wxBrush(Color2wxColour(fill), wxSOLID) |
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|
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stroke = prop.GetLineColor() |
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if stroke is Transparent: |
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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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|
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def low_level_renderer(self, layer): |
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"""Override inherited method to provide more efficient renderers |
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|
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If the underlying data format is not a shapefile or the layer |
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contains points shapes, simply use what the inherited method |
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returns. |
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|
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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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x = lambda a, b, c, d: None |
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#return (True, x, None) |
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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: |
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return BaseRenderer.low_level_renderer(self, layer) |
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|
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def label_font(self): |
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return wxFont(int(round(self.resolution * 10)), wxSWISS, wxNORMAL, |
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wxNORMAL) |
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|
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def projected_raster_layer(self, layer, srcProj, dstProj, extents, |
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resolution, dimensions, options): |
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"""Returns a raster layer image in projected space |
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|
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Based on a given filename. This method must be implemented in |
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classes derived from BaseRenderer. |
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""" |
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|
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ret = None |
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|
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if Thuban.Model.resource.has_gdal_support(): |
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|
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if versions['wxPython-tuple'] < (2,5,3): |
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options = options | 4 # INVERT_MASK_BITS |
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options = options & ~2 # ALPHA_MASK not supported |
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|
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try: |
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ret = ProjectRasterFile(layer.GetImageFilename(), |
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srcProj, dstProj, |
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extents, resolution, dimensions, |
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options) |
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except (MemoryError, IOError, AttributeError, ValueError): |
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# Why does this catch AttributeError and ValueError? |
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# FIXME: The exception should be communicated to the user |
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# better. |
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traceback.print_exc() |
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|
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return ret |
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|
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def draw_raster_data(self, layer, x,y, data, format = 'BMP'): |
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|
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mask = None |
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alpha = None |
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width = data[0] |
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height = data[1] |
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image_data, mask_data, alpha_data = data[2] |
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|
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if versions['wxPython-tuple'] < (2,5,3): |
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alpha_data = None |
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|
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if format == 'RAW': |
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image = wxEmptyImage(width, height) |
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image.SetData(image_data) |
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if mask_data is not None: |
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mask = wxBitmapFromBits(mask_data, width, height, 1) |
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mask = wxMask(mask) |
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elif alpha_data is not None: |
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# alpha_data is already in the right format |
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alpha = alpha_data |
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|
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else: |
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stream = cStringIO.StringIO(image_data) |
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image = wxImageFromStream(stream, raster_format_map[format]) |
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if mask_data is not None: |
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stream = cStringIO.StringIO(mask_data) |
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mask = wxImageFromStream(stream, raster_format_map[format]) |
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mask = wxMask(wxBitmapFromImage(mask, 1)) |
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elif alpha_data is not None: |
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stream = cStringIO.StringIO(alpha_data) |
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alpha = wxImageFromStream(stream, raster_format_map[format]) |
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alpha = alpha.GetData()[:] # XXX: do we need to copy this? |
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|
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# |
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# if we are using the alpha_data then scale down the alpha values |
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# by the layer's opacity using a string translation table |
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# |
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if alpha is not None: |
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lo = layer.Opacity() |
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if lo == 0: |
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return |
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elif lo == 1: |
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a = alpha |
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else: |
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tr = [int(i*lo) for i in range(256)] |
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table = array.array('B', tr).tostring() |
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a = alpha.translate(table) |
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|
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image.SetAlphaData(a) |
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|
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bitmap = wxBitmapFromImage(image) |
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|
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if mask is not None: |
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bitmap.SetMask(mask) |
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|
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self.dc.DrawBitmap(bitmap, int(round(x)), int(round(y)), True) |
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|
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|
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class ScreenRenderer(MapRenderer): |
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|
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# On the screen we want to see only visible layers by default |
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honor_visibility = 1 |
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|
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def RenderMap(self, selected_layer, selected_shapes): |
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"""Render the map. |
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|
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Only the given region (a tuple in window coordinates as returned |
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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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selected_layer. |
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""" |
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self.selected_layer = selected_layer |
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self.selected_shapes = selected_shapes |
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self.render_map() |
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|
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def RenderMapIncrementally(self): |
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"""Render the map. |
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|
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Only the given region (a tuple in window coordinates as returned |
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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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selected_layer. |
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""" |
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return self.render_map_incrementally() |
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|
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def draw_selection_incrementally(self, layer, selected_shapes): |
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"""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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|
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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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|
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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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|
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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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|
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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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|
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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 and field is not None: |
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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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|
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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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|
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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 |
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|
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Call the layer's ShapesInRegion method to determine the ids so |
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that it can use the quadtree. |
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""" |
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# FIXME: the quad-tree should be built from the projected |
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# coordinates not the lat-long ones because it's not trivial to |
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# determine an appropriate rectangle in lat-long for a given |
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# rectangle in projected coordinates which we have to start from |
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# here. |
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proj = self.map.projection |
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if proj is not None: |
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inverse = proj.Inverse |
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else: |
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inverse = None |
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|
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scale = self.scale |
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offx, offy = self.offset |
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xs = [] |
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ys = [] |
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x, y, width, height = self.region |
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for winx, winy in ((x, y), (x + width, y), |
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(x + width, y + height), (x, y + height)): |
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px = (winx - offx) / scale |
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py = -(winy - offy) / scale |
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if inverse: |
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px, py = inverse(px, py) |
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xs.append(px) |
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ys.append(py) |
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left = min(xs) |
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right = max(xs) |
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top = max(ys) |
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bottom = min(ys) |
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|
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return layer.ShapesInRegion((left, bottom, right, top)) |
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|
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|
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class ExportRenderer(ScreenRenderer): |
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|
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honor_visibility = 1 |
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|
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def __init__(self, *args, **kw): |
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"""Initialize the ExportRenderer. |
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|
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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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|
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def RenderMap(self, selected_layer, selected_shapes): |
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"""Render the map. |
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|
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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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|
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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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|
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self.selected_layer = selected_layer |
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self.selected_shapes = selected_shapes |
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|
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# Get some dimensions |
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llx, lly, urx, ury = self.region |
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mminx, mminy, mmaxx, mmaxy = self.destination_region |
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|
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# Manipulate the offset to position the map |
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offx, offy = self.offset |
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# 1. Shift to corner of map drawing area |
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offx = offx + mminx |
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offy = offy + mminy |
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|
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# 2. Center the map on the map drawing area: |
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# region identifies the region on the canvas view: |
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# center of map drawing area - half the size of region: rendering origin |
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self.shiftx = (mmaxx - mminx)*0.5 - (urx - llx)*0.5 |
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self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5 |
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|
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self.offset = (offx+self.shiftx, offy+self.shifty) |
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self.region = (llx + self.shiftx, lly + self.shifty, urx, ury) |
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|
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# Draw the map |
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self.dc.BeginDrawing() |
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self.dc.DestroyClippingRegion() |
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self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty, |
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urx, ury) |
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self.render_map() |
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self.dc.EndDrawing() |
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|
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# Draw the rest (frames, legend, scalebar) |
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self.dc.BeginDrawing() |
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self.dc.DestroyClippingRegion() |
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|
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# Force the font for Legend drawing |
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font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL) |
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self.dc.SetFont(font) |
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|
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self.render_frame() |
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self.render_legend() |
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self.render_scalebar() |
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self.dc.EndDrawing() |
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|
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def render_frame(self): |
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"""Render the frames for map and legend/scalebar.""" |
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|
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dc = self.dc |
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dc.SetPen(wxBLACK_PEN) |
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dc.SetBrush(wxTRANSPARENT_BRUSH) |
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|
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# Dimension stuff |
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width, height = dc.GetSizeTuple() |
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mminx, mminy, mmaxx, mmaxy = self.destination_region |
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|
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# Page Frame |
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dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10) |
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|
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# Map Frame |
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llx, lly, urx, ury = self.region |
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dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury) |
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|
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# Legend Frame |
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dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy) |
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|
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dc.DestroyClippingRegion() |
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dc.SetClippingRegion(mmaxx+10,mminy, |
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(width-20) - (mmaxx+10), mmaxy-mminy) |
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|
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def render_legend(self): |
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"""Render the legend on the Map.""" |
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|
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previewer = ClassDataPreviewer() |
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dc = self.dc |
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dc.SetPen(wxBLACK_PEN) |
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dc.SetBrush(wxTRANSPARENT_BRUSH) |
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|
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# Dimension stuff |
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width, height = dc.GetSizeTuple() |
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mminx, mminy, mmaxx, mmaxy = self.destination_region |
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textwidth, textheight = dc.GetTextExtent("0") |
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iconwidth = textheight |
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iconheight = textheight |
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stepy = textheight+3 |
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dx = 10 |
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posx = mmaxx + 10 + 5 # 10 pix distance mapframe/legend frame, |
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# 5 pix inside legend frame |
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posy = mminy + 5 # 5 pix inside legend frame |
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|
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# Render the legend |
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dc.SetTextForeground(wxBLACK) |
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if self.map.HasLayers(): |
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layers = self.map.Layers()[:] |
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layers.reverse() |
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for l in layers: |
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if l.Visible(): |
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# Render title |
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dc.DrawText(l.Title(), posx, posy) |
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posy+=stepy |
| 445 |
if l.HasClassification(): |
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# Render classification |
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clazz = l.GetClassification() |
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shapeType = l.ShapeType() |
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for g in clazz: |
| 450 |
if g.IsVisible(): |
| 451 |
previewer.Draw(dc, |
| 452 |
wxRect(posx+dx, posy, |
| 453 |
iconwidth, iconheight), |
| 454 |
g.GetProperties(), shapeType) |
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dc.DrawText(g.GetDisplayText(), |
| 456 |
posx+2*dx+iconwidth, posy) |
| 457 |
posy+=stepy |
| 458 |
|
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def render_scalebar(self): |
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"""Render the scalebar.""" |
| 461 |
|
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scalebar = ScaleBar(self.map) |
| 463 |
|
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# Dimension stuff |
| 465 |
width, height = self.dc.GetSizeTuple() |
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mminx, mminy, mmaxx, mmaxy = self.destination_region |
| 467 |
|
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# Render the scalebar |
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scalebar.DrawScaleBar(self.scale, self.dc, |
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(mmaxx+10+5, mmaxy-25), |
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((width-15-5) - (mmaxx+10+5),20) |
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) |
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# 10 pix between map and legend frame, 5 pix inside legend frame |
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# 25 pix from the legend frame bottom line |
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# Width: 15 pix from DC border, 5 pix inside frame, 10, 5 as above |
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# Height: 20 |
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|
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class PrinterRenderer(ExportRenderer): |
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|
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# Printing as well as Export / Screen display only the visible layer. |
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honor_visibility = 1 |
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|
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