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# Copyright (c) 2001, 2002, 2003 by Intevation GmbH |
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# Authors: |
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# Bernhard Herzog <[email protected]> |
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# Jonathan Coles <[email protected]> |
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# Frank Koormann <[email protected]> |
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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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__version__ = "$Revision$" |
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|
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import cStringIO |
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|
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from Thuban import _ |
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|
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from wxPython.wx import wxMemoryDC, wxEmptyBitmap, \ |
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wxPoint, wxRect, wxPen, wxBrush, wxFont, \ |
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wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \ |
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wxBLACK_PEN, wxRED_PEN, wxBLACK, \ |
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wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL, \ |
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wxBitmap, wxImageFromBitmap, wxBitmapFromImage, \ |
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wxImageFromStream, wxBITMAP_TYPE_BMP |
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|
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from wxproj import draw_polygon_shape, draw_polygon_init |
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from gdalwarp import ProjectRasterFile |
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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.layer import Layer, RasterLayer, \ |
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SHAPETYPE_POLYGON, SHAPETYPE_ARC, 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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|
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from Thuban.Model.classification import Classification |
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from Thuban.Model.color import Color |
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|
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class MapRenderer: |
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|
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"""Class to render a map onto a wxDC""" |
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|
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honor_visibility = 1 |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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def render_map(self, map): |
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self.map = map |
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seenRaster = True |
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|
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if self.scale == 0: |
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return |
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|
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# |
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# This is only a good optimization if there is only one |
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# raster layer and the image covers the entire window (as |
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# it currently does). |
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# |
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for layer in map.Layers(): |
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if isinstance(layer, RasterLayer): |
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seenRaster = False |
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break |
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|
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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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if isinstance(layer, Layer) and seenRaster: |
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self.draw_shape_layer(layer) |
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elif isinstance(layer, RasterLayer): |
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self.draw_raster_layer(layer) |
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seenRaster = True |
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|
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self.draw_label_layer(map.LabelLayer()) |
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|
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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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|
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map_proj = self.map.projection |
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layer_proj = layer.projection |
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|
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shapetype = layer.ShapeType() |
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|
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brush = wxTRANSPARENT_BRUSH |
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pen = wxTRANSPARENT_PEN |
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|
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old_prop = None |
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old_group = None |
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lc = layer.GetClassification() |
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field = lc.GetField() |
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defaultGroup = lc.GetDefaultGroup() |
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|
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|
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if shapetype != SHAPETYPE_POINT: |
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polygon_render_param = self.polygon_render_param(layer) |
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|
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if shapetype == SHAPETYPE_POINT: |
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draw_func = lambda i: \ |
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self.draw_point_shape(layer, i) |
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else: |
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draw_func = lambda i: \ |
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self.draw_polygon_shape(polygon_render_param, i, pen, brush) |
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|
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for i in self.layer_ids(layer): |
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|
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if field is None: |
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group = defaultGroup |
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else: |
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record = layer.table.ReadRowAsDict(i) |
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assert record is not None |
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group = lc.FindGroup(record[field]) |
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|
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|
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if not group.IsVisible(): |
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continue |
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|
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|
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# don't recreate new objects if they are the same as before |
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if group is not old_group: |
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old_group = group |
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|
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prop = group.GetProperties() |
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|
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if prop != old_prop: |
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old_prop = prop |
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|
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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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|
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|
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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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|
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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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|
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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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|
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draw_func(i) |
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|
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def draw_raster_layer(self, layer): |
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data = None |
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offx, offy = self.offset |
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width, height = self.dc.GetSizeTuple() |
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|
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inProj = "" |
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proj = layer.GetProjection() |
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if proj is not None: |
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for p in proj.GetAllParameters(): |
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inProj += "+" + p + " " |
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|
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outProj = "" |
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proj = self.map.GetProjection() |
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if proj is not None: |
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for p in proj.GetAllParameters(): |
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outProj += "+" + p + " " |
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|
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xmin = (0 - offx) / self.scale |
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ymin = (offy - height) / self.scale |
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xmax = (width - offx) / self.scale |
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ymax = (offy - 0) / self.scale |
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|
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try: |
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data = ProjectRasterFile( |
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layer.GetImageFilename(), |
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inProj, |
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outProj, |
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(xmin, ymin, xmax, ymax), |
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"", (width, height)) |
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except IOError, (strerr): |
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print strerr |
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except (AttributeError, ValueError): |
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pass |
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else: |
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if data is not None: |
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stream = cStringIO.StringIO(data) |
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image = wxImageFromStream(stream, wxBITMAP_TYPE_BMP) |
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bitmap = wxBitmapFromImage(image) |
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self.dc.BeginDrawing() |
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self.dc.DrawBitmap(bitmap, 0, 0) |
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self.dc.EndDrawing() |
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|
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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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|
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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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|
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def polygon_render_param(self, layer): |
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"""Return the low-lever render parameter for the layer""" |
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offx, offy = self.offset |
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return draw_polygon_init(layer.shapefile, self.dc, |
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self.map.projection, |
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layer.projection, |
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self.scale, -self.scale, |
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offx, offy) |
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|
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def draw_polygon_shape(self, draw_polygon_info, index, pen, brush): |
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draw_polygon_shape(draw_polygon_info, index, pen, brush) |
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|
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def projected_points(self, layer, index): |
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proj = self.map.GetProjection() |
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if proj is not None: |
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forward = proj.Forward |
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else: |
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forward = None |
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proj = layer.GetProjection() |
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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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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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|
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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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|
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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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|
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if len(pp) == 0: return # ignore Null Shapes which have no points |
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|
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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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|
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def draw_label_layer(self, layer): |
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scale = self.scale |
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offx, offy = self.offset |
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|
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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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map_proj = self.map.projection |
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if map_proj is not None: |
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forward = map_proj.Forward |
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else: |
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forward = None |
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|
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for label in layer.Labels(): |
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x = label.x |
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y = label.y |
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text = label.text |
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if forward: |
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x, y = forward(x, y) |
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x = x * scale + offx |
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y = -y * scale + offy |
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width, height = self.dc.GetTextExtent(text) |
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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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|
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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, map, region, 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.update_region = region |
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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(map) |
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|
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def draw_shape_layer(self, layer): |
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MapRenderer.draw_shape_layer(self, layer) |
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if layer is self.selected_layer and self.selected_shapes: |
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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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if shapetype == SHAPETYPE_POLYGON: |
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offx, offy = self.offset |
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renderparam = self.polygon_render_param(layer) |
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func = self.draw_polygon_shape |
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args = (pen, brush) |
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elif shapetype == SHAPETYPE_ARC: |
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renderparam = self.polygon_render_param(layer) |
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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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renderparam = layer |
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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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|
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for index in self.selected_shapes: |
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func(renderparam, index, *args) |
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|
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|
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def layer_ids(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.update_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 RenderMap(self, map, region, mapregion, |
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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 Thuban.UI.view.OutputTranform(). |
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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 the |
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scalebar on the given DC. The map is rendered with the region displayed |
| 415 |
in the canvas view, centered on the area available for map display. |
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""" |
| 417 |
|
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self.update_region = region |
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self.selected_layer = selected_layer |
| 420 |
self.selected_shapes = selected_shapes |
| 421 |
|
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# Get some dimensions |
| 423 |
llx, lly, urx, ury = region |
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self.mapregion = mapregion |
| 425 |
mminx, mminy, mmaxx, mmaxy = self.mapregion |
| 426 |
|
| 427 |
# Manipulate the offset to position the map |
| 428 |
offx, offy = self.offset |
| 429 |
# 1. Shift to corner of map drawing area |
| 430 |
offx = offx + mminx |
| 431 |
offy = offy + mminy |
| 432 |
|
| 433 |
# 2. Center the map on the map drawing area: |
| 434 |
# region identifies the region on the canvas view: |
| 435 |
# center of map drawing area - half the size of region: rendering origin |
| 436 |
self.shiftx = (mmaxx - mminx)*0.5 - (urx - llx)*0.5 |
| 437 |
self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5 |
| 438 |
|
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self.offset = (offx+self.shiftx, offy+self.shifty) |
| 440 |
|
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# Draw the map |
| 442 |
self.dc.BeginDrawing() |
| 443 |
self.dc.DestroyClippingRegion() |
| 444 |
self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty, |
| 445 |
urx, ury) |
| 446 |
self.render_map(map) |
| 447 |
self.dc.EndDrawing() |
| 448 |
|
| 449 |
# Draw the rest (frames, legend, scalebar) |
| 450 |
self.dc.BeginDrawing() |
| 451 |
self.dc.DestroyClippingRegion() |
| 452 |
|
| 453 |
# Force the font for Legend drawing |
| 454 |
font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL) |
| 455 |
self.dc.SetFont(font) |
| 456 |
|
| 457 |
self.render_frame(region) |
| 458 |
self.render_legend(map) |
| 459 |
self.render_scalebar(map) |
| 460 |
self.dc.EndDrawing() |
| 461 |
|
| 462 |
def render_frame(self, region): |
| 463 |
"""Render the frames for map and legend/scalebar.""" |
| 464 |
|
| 465 |
dc = self.dc |
| 466 |
dc.SetPen(wxBLACK_PEN) |
| 467 |
dc.SetBrush(wxTRANSPARENT_BRUSH) |
| 468 |
|
| 469 |
# Dimension stuff |
| 470 |
width, height = dc.GetSizeTuple() |
| 471 |
mminx, mminy, mmaxx, mmaxy = self.mapregion |
| 472 |
|
| 473 |
# Page Frame |
| 474 |
dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10) |
| 475 |
|
| 476 |
# Map Frame |
| 477 |
llx, lly, urx, ury = region |
| 478 |
dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury) |
| 479 |
|
| 480 |
# Legend Frame |
| 481 |
dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy) |
| 482 |
|
| 483 |
dc.DestroyClippingRegion() |
| 484 |
dc.SetClippingRegion(mmaxx+10,mminy, |
| 485 |
(width-20) - (mmaxx+10), mmaxy-mminy) |
| 486 |
|
| 487 |
def render_legend(self, map): |
| 488 |
"""Render the legend on the Map.""" |
| 489 |
|
| 490 |
previewer = ClassDataPreviewer() |
| 491 |
dc = self.dc |
| 492 |
dc.SetPen(wxBLACK_PEN) |
| 493 |
dc.SetBrush(wxTRANSPARENT_BRUSH) |
| 494 |
|
| 495 |
# Dimension stuff |
| 496 |
width, height = dc.GetSizeTuple() |
| 497 |
mminx, mminy, mmaxx, mmaxy = self.mapregion |
| 498 |
textwidth, textheight = dc.GetTextExtent("0") |
| 499 |
iconwidth = textheight |
| 500 |
iconheight = textheight |
| 501 |
stepy = textheight+3 |
| 502 |
dx = 10 |
| 503 |
posx = mmaxx + 10 + 5 # 10 pix distance mapframe/legend frame, |
| 504 |
# 5 pix inside legend frame |
| 505 |
posy = mminy + 5 # 5 pix inside legend frame |
| 506 |
|
| 507 |
# Render the legend |
| 508 |
dc.SetTextForeground(wxBLACK) |
| 509 |
if map.HasLayers(): |
| 510 |
layers = map.Layers()[:] |
| 511 |
layers.reverse() |
| 512 |
for l in layers: |
| 513 |
if l.Visible(): |
| 514 |
# Render title |
| 515 |
dc.DrawText(l.Title(), posx, posy) |
| 516 |
posy+=stepy |
| 517 |
# Render classification |
| 518 |
clazz = l.GetClassification() |
| 519 |
shapeType = l.ShapeType() |
| 520 |
for g in clazz: |
| 521 |
if g.IsVisible(): |
| 522 |
previewer.Draw(dc, |
| 523 |
wxRect(posx+dx, posy, iconwidth, iconheight), |
| 524 |
g.GetProperties(), shapeType) |
| 525 |
dc.DrawText(g.GetDisplayText(), |
| 526 |
posx+2*dx+iconwidth, posy) |
| 527 |
posy+=stepy |
| 528 |
|
| 529 |
def render_scalebar(self, map): |
| 530 |
"""Render the scalebar.""" |
| 531 |
|
| 532 |
scalebar = ScaleBar(map) |
| 533 |
|
| 534 |
# Dimension stuff |
| 535 |
width, height = self.dc.GetSizeTuple() |
| 536 |
mminx, mminy, mmaxx, mmaxy = self.mapregion |
| 537 |
|
| 538 |
# Render the scalebar |
| 539 |
scalebar.DrawScaleBar(self.scale, self.dc, |
| 540 |
(mmaxx+10+5, mmaxy-25), |
| 541 |
((width-15-5) - (mmaxx+10+5),20) |
| 542 |
) |
| 543 |
# 10 pix between map and legend frame, 5 pix inside legend frame |
| 544 |
# 25 pix from the legend frame bottom line |
| 545 |
# Width: 15 pix from DC border, 5 pix inside frame, 10, 5 as above |
| 546 |
# Height: 20 |
| 547 |
|
| 548 |
class PrinterRenderer(ExportRenderer): |
| 549 |
|
| 550 |
# Printing as well as Export / Screen display only the visible layer. |
| 551 |
honor_visibility = 1 |
| 552 |
|
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