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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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# |
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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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from wxPython.wx import wxPoint, wxColour, wxPen, wxBrush, wxFont, \ |
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wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \ |
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wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL |
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|
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from wxproj import draw_polygon_shape |
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|
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from Thuban import _ |
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|
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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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|
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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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|
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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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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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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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|
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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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for i in self.layer_ids(layer): |
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value = None |
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lc = layer.GetClassification() |
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field = lc.field |
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|
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if field is not None: |
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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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|
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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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prop = lc.GetClassData(value) |
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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.None |
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else: |
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fill = prop.GetFill() |
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|
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if fill is Color.None: |
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brush = wxTRANSPARENT_BRUSH |
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else: |
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color = wxColour(fill.red * 255, |
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fill.green * 255, |
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fill.blue * 255) |
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brush = wxBrush(color, wxSOLID) |
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|
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stroke = prop.GetStroke() |
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stroke_width = prop.GetStrokeWidth() |
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if stroke is Color.None: |
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pen = wxTRANSPARENT_PEN |
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else: |
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color = wxColour(stroke.red * 255, |
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stroke.green * 255, |
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stroke.blue * 255) |
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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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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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|
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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 draw_polygon_shape(self, layer, index, pen, brush): |
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offx, offy = self.offset |
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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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|
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def projected_points(self, layer, index): |
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proj = self.map.projection |
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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.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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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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p = self.projected_points(layer, index)[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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# On the screen we want to see only visible layers by default |
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honor_visibility = 1 |
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def RenderMap(self, map, region, selected_layer, selected_shape): |
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"""Render the map. |
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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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shape with id selected_shape in the 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_shape = selected_shape |
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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_shape is not None: |
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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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index = self.selected_shape |
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if shapetype == SHAPETYPE_POLYGON: |
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self.draw_polygon_shape(layer, index, pen, brush) |
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elif shapetype == SHAPETYPE_ARC: |
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self.draw_polygon_shape(layer, index, pen, None) |
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else: |
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self.dc.SetBrush(brush) |
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self.dc.SetPen(pen) |
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if shapetype == SHAPETYPE_POINT: |
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self.draw_point_shape(layer, index) |
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else: |
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raise TypeError(_("Unhandled shape type %s") % shapetype) |
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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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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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return layer.ShapesInRegion((left, bottom, right, top)) |
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|
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|
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class PrinterRender(MapRenderer): |
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|
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# When printing we want to see all layers |
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honor_visibility = 0 |
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RenderMap = MapRenderer.render_map |
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|
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