| 1 |
# Copyright (c) 2001, 2002 by Intevation GmbH |
| 2 |
# Authors: |
| 3 |
# Bernhard Herzog <[email protected]> |
| 4 |
# Jonathan Coles <[email protected]> |
| 5 |
# |
| 6 |
# This program is free software under the GPL (>=v2) |
| 7 |
# Read the file COPYING coming with Thuban for details. |
| 8 |
|
| 9 |
__version__ = "$Revision$" |
| 10 |
|
| 11 |
from wxPython.wx import wxPoint, wxColour, wxPen, wxBrush, wxFont, \ |
| 12 |
wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \ |
| 13 |
wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL |
| 14 |
|
| 15 |
from wxproj import draw_polygon_shape |
| 16 |
|
| 17 |
from Thuban import _ |
| 18 |
|
| 19 |
from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \ |
| 20 |
SHAPETYPE_POINT |
| 21 |
from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \ |
| 22 |
ALIGN_LEFT, ALIGN_RIGHT, ALIGN_BASELINE |
| 23 |
|
| 24 |
from Thuban.Model.classification import Classification |
| 25 |
from Thuban.Model.color import Color |
| 26 |
|
| 27 |
|
| 28 |
class MapRenderer: |
| 29 |
|
| 30 |
"""Class to render a map onto a wxDC""" |
| 31 |
|
| 32 |
honor_visibility = 1 |
| 33 |
|
| 34 |
def __init__(self, dc, scale, offset, resolution = 72.0, |
| 35 |
honor_visibility = None): |
| 36 |
"""Inititalize the renderer. |
| 37 |
|
| 38 |
dc -- the wxPython DC to render on |
| 39 |
scale, offset -- the scale factor and translation to convert |
| 40 |
between projected coordinates and the DC coordinates |
| 41 |
|
| 42 |
resolution -- the assumed resolution of the DC. Used to convert |
| 43 |
absolute lengths like font sizes to DC coordinates |
| 44 |
|
| 45 |
honor_visibility -- boolean. If true, honor the visibility flag |
| 46 |
of the layers, otherwise draw all layers. If None, use |
| 47 |
the renderer's default. |
| 48 |
""" |
| 49 |
# resolution in pixel/inch |
| 50 |
self.dc = dc |
| 51 |
self.scale = scale |
| 52 |
self.offset = offset |
| 53 |
if honor_visibility is not None: |
| 54 |
self.honor_visibility = honor_visibility |
| 55 |
# store the resolution in pixel/point because it's more useful |
| 56 |
# later. |
| 57 |
self.resolution = resolution / 72.0 |
| 58 |
|
| 59 |
def render_map(self, map): |
| 60 |
self.map = map |
| 61 |
for layer in map.Layers(): |
| 62 |
# if honor_visibility is true, only draw visible layers, |
| 63 |
# otherwise draw all layers |
| 64 |
if not self.honor_visibility or layer.Visible(): |
| 65 |
self.draw_shape_layer(layer) |
| 66 |
self.draw_label_layer(map.LabelLayer()) |
| 67 |
|
| 68 |
def draw_shape_layer(self, layer): |
| 69 |
scale = self.scale |
| 70 |
offx, offy = self.offset |
| 71 |
|
| 72 |
map_proj = self.map.projection |
| 73 |
layer_proj = layer.projection |
| 74 |
|
| 75 |
shapetype = layer.ShapeType() |
| 76 |
|
| 77 |
brush = wxTRANSPARENT_BRUSH |
| 78 |
pen = wxTRANSPARENT_PEN |
| 79 |
|
| 80 |
old_prop = None |
| 81 |
for i in self.layer_ids(layer): |
| 82 |
value = None |
| 83 |
shape = layer.Shape(i) |
| 84 |
lc = layer.GetClassification() |
| 85 |
field = lc.field |
| 86 |
|
| 87 |
if field is not None: |
| 88 |
record = layer.table.read_record(i) |
| 89 |
if record is not None: |
| 90 |
value = record[field] |
| 91 |
|
| 92 |
# |
| 93 |
# if the above statements fail 'value' should |
| 94 |
# be null, at which point this call will |
| 95 |
# at least retreive the NullData |
| 96 |
# |
| 97 |
prop = lc.GetProperties(value) |
| 98 |
|
| 99 |
if prop != old_prop: |
| 100 |
old_prop = prop |
| 101 |
|
| 102 |
if shapetype == SHAPETYPE_ARC: |
| 103 |
fill = Color.None |
| 104 |
else: |
| 105 |
fill = prop.GetFill() |
| 106 |
|
| 107 |
if fill is Color.None: |
| 108 |
brush = wxTRANSPARENT_BRUSH |
| 109 |
else: |
| 110 |
color = wxColour(fill.red * 255, |
| 111 |
fill.green * 255, |
| 112 |
fill.blue * 255) |
| 113 |
brush = wxBrush(color, wxSOLID) |
| 114 |
|
| 115 |
stroke = prop.GetStroke() |
| 116 |
stroke_width = prop.GetStrokeWidth() |
| 117 |
if stroke is Color.None: |
| 118 |
pen = wxTRANSPARENT_PEN |
| 119 |
else: |
| 120 |
color = wxColour(stroke.red * 255, |
| 121 |
stroke.green * 255, |
| 122 |
stroke.blue * 255) |
| 123 |
pen = wxPen(color, stroke_width, wxSOLID) |
| 124 |
|
| 125 |
if shapetype == SHAPETYPE_POINT: |
| 126 |
self.dc.SetBrush(brush) |
| 127 |
self.dc.SetPen(pen) |
| 128 |
self.draw_point_shape(layer, i) |
| 129 |
else: |
| 130 |
self.draw_polygon_shape(layer, i, pen, brush) |
| 131 |
|
| 132 |
def layer_ids(self, layer): |
| 133 |
"""Return the shape ids of the given layer that have to be drawn. |
| 134 |
|
| 135 |
The default implementation simply returns all ids in the layer. |
| 136 |
Override in derived classes to be more precise. |
| 137 |
""" |
| 138 |
return range(layer.NumShapes()) |
| 139 |
|
| 140 |
def draw_polygon_shape(self, layer, index, pen, brush): |
| 141 |
offx, offy = self.offset |
| 142 |
draw_polygon_shape(layer.shapefile.cobject(), index, |
| 143 |
self.dc, pen, brush, |
| 144 |
self.map.projection, layer.projection, |
| 145 |
self.scale, -self.scale, offx, offy) |
| 146 |
|
| 147 |
def projected_points(self, layer, index): |
| 148 |
proj = self.map.projection |
| 149 |
if proj is not None: |
| 150 |
forward = proj.Forward |
| 151 |
else: |
| 152 |
forward = None |
| 153 |
proj = layer.projection |
| 154 |
if proj is not None: |
| 155 |
inverse = proj.Inverse |
| 156 |
else: |
| 157 |
inverse = None |
| 158 |
shape = layer.Shape(index) |
| 159 |
points = [] |
| 160 |
scale = self.scale |
| 161 |
offx, offy = self.offset |
| 162 |
for x, y in shape.Points(): |
| 163 |
if inverse: |
| 164 |
x, y = inverse(x, y) |
| 165 |
if forward: |
| 166 |
x, y = forward(x, y) |
| 167 |
points.append(wxPoint(x * scale + offx, |
| 168 |
-y * scale + offy)) |
| 169 |
return points |
| 170 |
|
| 171 |
def draw_arc_shape(self, layer, index): |
| 172 |
points = self.projected_points(layer, index) |
| 173 |
self.dc.DrawLines(points) |
| 174 |
|
| 175 |
def draw_point_shape(self, layer, index): |
| 176 |
p = self.projected_points(layer, index)[0] |
| 177 |
radius = self.resolution * 5 |
| 178 |
self.dc.DrawEllipse(p.x - radius, p.y - radius, 2*radius, 2*radius) |
| 179 |
|
| 180 |
def draw_label_layer(self, layer): |
| 181 |
scale = self.scale |
| 182 |
offx, offy = self.offset |
| 183 |
|
| 184 |
font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL) |
| 185 |
self.dc.SetFont(font) |
| 186 |
|
| 187 |
map_proj = self.map.projection |
| 188 |
if map_proj is not None: |
| 189 |
forward = map_proj.Forward |
| 190 |
else: |
| 191 |
forward = None |
| 192 |
|
| 193 |
for label in layer.Labels(): |
| 194 |
x = label.x |
| 195 |
y = label.y |
| 196 |
text = label.text |
| 197 |
if forward: |
| 198 |
x, y = forward(x, y) |
| 199 |
x = x * scale + offx |
| 200 |
y = -y * scale + offy |
| 201 |
width, height = self.dc.GetTextExtent(text) |
| 202 |
if label.halign == ALIGN_LEFT: |
| 203 |
# nothing to be done |
| 204 |
pass |
| 205 |
elif label.halign == ALIGN_RIGHT: |
| 206 |
x = x - width |
| 207 |
elif label.halign == ALIGN_CENTER: |
| 208 |
x = x - width/2 |
| 209 |
if label.valign == ALIGN_TOP: |
| 210 |
# nothing to be done |
| 211 |
pass |
| 212 |
elif label.valign == ALIGN_BOTTOM: |
| 213 |
y = y - height |
| 214 |
elif label.valign == ALIGN_CENTER: |
| 215 |
y = y - height/2 |
| 216 |
self.dc.DrawText(text, x, y) |
| 217 |
|
| 218 |
|
| 219 |
class ScreenRenderer(MapRenderer): |
| 220 |
|
| 221 |
# On the screen we want to see only visible layers by default |
| 222 |
honor_visibility = 1 |
| 223 |
|
| 224 |
def RenderMap(self, map, region, selected_layer, selected_shape): |
| 225 |
"""Render the map. |
| 226 |
|
| 227 |
Only the given region (a tuple in window coordinates as returned |
| 228 |
by a wxrect's asTuple method) needs to be redrawn. Highlight the |
| 229 |
shape with id selected_shape in the selected_layer. |
| 230 |
""" |
| 231 |
self.update_region = region |
| 232 |
self.selected_layer = selected_layer |
| 233 |
self.selected_shape = selected_shape |
| 234 |
self.render_map(map) |
| 235 |
|
| 236 |
def draw_shape_layer(self, layer): |
| 237 |
MapRenderer.draw_shape_layer(self, layer) |
| 238 |
if layer is self.selected_layer and self.selected_shape is not None: |
| 239 |
pen = wxPen(wxBLACK, 3, wxSOLID) |
| 240 |
brush = wxBrush(wxBLACK, wxCROSS_HATCH) |
| 241 |
|
| 242 |
shapetype = layer.ShapeType() |
| 243 |
index = self.selected_shape |
| 244 |
if shapetype == SHAPETYPE_POLYGON: |
| 245 |
self.draw_polygon_shape(layer, index, pen, brush) |
| 246 |
elif shapetype == SHAPETYPE_ARC: |
| 247 |
self.draw_polygon_shape(layer, index, pen, None) |
| 248 |
else: |
| 249 |
self.dc.SetBrush(brush) |
| 250 |
self.dc.SetPen(pen) |
| 251 |
if shapetype == SHAPETYPE_POINT: |
| 252 |
self.draw_point_shape(layer, index) |
| 253 |
else: |
| 254 |
raise TypeError(_("Unhandled shape type %s") % shapetype) |
| 255 |
|
| 256 |
def layer_ids(self, layer): |
| 257 |
"""Return the shapeids covered by the region that has to be redrawn |
| 258 |
|
| 259 |
Call the layer's ShapesInRegion method to determine the ids so |
| 260 |
that it can use the quadtree. |
| 261 |
""" |
| 262 |
# FIXME: the quad-tree should be built from the projected |
| 263 |
# coordinates not the lat-long ones because it's not trivial to |
| 264 |
# determine an appropriate rectangle in lat-long for a given |
| 265 |
# rectangle in projected coordinates which we have to start from |
| 266 |
# here. |
| 267 |
proj = self.map.projection |
| 268 |
if proj is not None: |
| 269 |
inverse = proj.Inverse |
| 270 |
else: |
| 271 |
inverse = None |
| 272 |
|
| 273 |
scale = self.scale |
| 274 |
offx, offy = self.offset |
| 275 |
xs = [] |
| 276 |
ys = [] |
| 277 |
x, y, width, height = self.update_region |
| 278 |
for winx, winy in ((x, y), (x + width, y), |
| 279 |
(x + width, y + height), (x, y + height)): |
| 280 |
px = (winx - offx) / scale |
| 281 |
py = -(winy - offy) / scale |
| 282 |
if inverse: |
| 283 |
px, py = inverse(px, py) |
| 284 |
xs.append(px) |
| 285 |
ys.append(py) |
| 286 |
left = min(xs) |
| 287 |
right = max(xs) |
| 288 |
top = max(ys) |
| 289 |
bottom = min(ys) |
| 290 |
|
| 291 |
return layer.ShapesInRegion((left, bottom, right, top)) |
| 292 |
|
| 293 |
|
| 294 |
class PrinterRender(MapRenderer): |
| 295 |
|
| 296 |
# When printing we want to see all layers |
| 297 |
honor_visibility = 0 |
| 298 |
|
| 299 |
RenderMap = MapRenderer.render_map |
| 300 |
|
Parent Directory
| 
Revision Log