| 1 |
# opyright (c) 2001, 2002, 2003, 2004 by Intevation GmbH |
| 2 |
# Authors: |
| 3 |
# Bernhard Herzog <[email protected]> |
| 4 |
# Frank Koormann <[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 |
""" |
| 10 |
Classes for display of a map and interaction with it |
| 11 |
""" |
| 12 |
|
| 13 |
from __future__ import generators |
| 14 |
|
| 15 |
__version__ = "$Revision$" |
| 16 |
# $Source$ |
| 17 |
# $Id$ |
| 18 |
|
| 19 |
import os.path |
| 20 |
import time |
| 21 |
import traceback |
| 22 |
|
| 23 |
import wx |
| 24 |
|
| 25 |
# Export related stuff |
| 26 |
if wx.Platform == '__WXMSW__': |
| 27 |
from wx import MetaFileDC |
| 28 |
|
| 29 |
from Thuban import _ |
| 30 |
|
| 31 |
from Thuban.Model.messages import MAP_LAYERS_CHANGED, LAYER_CHANGED, \ |
| 32 |
LAYER_VISIBILITY_CHANGED |
| 33 |
|
| 34 |
from renderer import ScreenRenderer, ExportRenderer, PrinterRenderer |
| 35 |
|
| 36 |
import labeldialog |
| 37 |
|
| 38 |
from viewport import ViewPort, PanTool, output_transform |
| 39 |
|
| 40 |
class CanvasPanTool(PanTool): |
| 41 |
|
| 42 |
"""The Canvas Pan Tool""" |
| 43 |
|
| 44 |
def MouseMove(self, event): |
| 45 |
if self.dragging: |
| 46 |
PanTool.MouseMove(self, event) |
| 47 |
sx, sy = self.start |
| 48 |
x, y = self.current |
| 49 |
width, height = self.view.GetSizeTuple() |
| 50 |
|
| 51 |
bitmapdc = wx.MemoryDC() |
| 52 |
bitmapdc.SelectObject(self.view.PreviewBitmap()) |
| 53 |
|
| 54 |
dc = self.view.drag_dc |
| 55 |
dc.Blit(0, 0, width, height, bitmapdc, sx - x, sy - y) |
| 56 |
|
| 57 |
class MapPrintout(wx.Printout): |
| 58 |
|
| 59 |
""" |
| 60 |
wxPrintout class for printing Thuban maps |
| 61 |
""" |
| 62 |
|
| 63 |
def __init__(self, canvas, map, region, selected_layer, selected_shapes): |
| 64 |
wx.Printout.__init__(self) |
| 65 |
self.canvas = canvas |
| 66 |
self.map = map |
| 67 |
self.region = region |
| 68 |
self.selected_layer = selected_layer |
| 69 |
self.selected_shapes = selected_shapes |
| 70 |
|
| 71 |
def GetPageInfo(self): |
| 72 |
return (1, 1, 1, 1) |
| 73 |
|
| 74 |
def HasPage(self, pagenum): |
| 75 |
return pagenum == 1 |
| 76 |
|
| 77 |
def OnPrintPage(self, pagenum): |
| 78 |
if pagenum == 1: |
| 79 |
self.draw_on_dc(self.GetDC()) |
| 80 |
|
| 81 |
def draw_on_dc(self, dc): |
| 82 |
width, height = self.GetPageSizePixels() |
| 83 |
scale, offset, mapregion = output_transform(self.canvas.scale, |
| 84 |
self.canvas.offset, |
| 85 |
self.canvas.GetSizeTuple(), |
| 86 |
self.GetPageSizePixels()) |
| 87 |
resx, resy = self.GetPPIPrinter() |
| 88 |
canvas_scale = self.canvas.scale |
| 89 |
x, y, width, height = self.region |
| 90 |
renderer = PrinterRenderer(dc, self.map, scale, offset, |
| 91 |
region = (mapregion[0], mapregion[1], |
| 92 |
(width/canvas_scale)*scale, |
| 93 |
(height/canvas_scale)*scale), |
| 94 |
resolution = resy, |
| 95 |
destination_region = mapregion) |
| 96 |
renderer.RenderMap(self.selected_layer, self.selected_shapes) |
| 97 |
return True |
| 98 |
|
| 99 |
|
| 100 |
class MapCanvas(wx.Window, ViewPort): |
| 101 |
|
| 102 |
"""A widget that displays a map and offers some interaction""" |
| 103 |
|
| 104 |
def __init__(self, parent, winid): |
| 105 |
wx.Window.__init__(self, parent, winid) |
| 106 |
ViewPort.__init__(self) |
| 107 |
|
| 108 |
self.SetBackgroundColour(wx.Colour(255, 255, 255)) |
| 109 |
|
| 110 |
# the bitmap serving as backing store |
| 111 |
self.bitmap = None |
| 112 |
# the monochrome bitmap with the selection if any |
| 113 |
self.selection_bitmap = None |
| 114 |
|
| 115 |
self.backgroundColor = wx.WHITE_BRUSH |
| 116 |
|
| 117 |
# The rendering iterator object. Used when rendering |
| 118 |
# incrementally |
| 119 |
self.render_iter = None |
| 120 |
|
| 121 |
# subscribe the WX events we're interested in |
| 122 |
self.Bind(wx.EVT_PAINT, self.OnPaint) |
| 123 |
self.Bind(wx.EVT_LEFT_DOWN, self.OnLeftDown) |
| 124 |
self.Bind(wx.EVT_LEFT_UP, self.OnLeftUp) |
| 125 |
self.Bind(wx.EVT_MIDDLE_DOWN, self.OnMiddleDown) |
| 126 |
self.Bind(wx.EVT_MIDDLE_UP, self.OnMiddleUp) |
| 127 |
self.Bind(wx.EVT_MOTION, self.OnMotion) |
| 128 |
self.Bind(wx.EVT_LEAVE_WINDOW, self.OnLeaveWindow) |
| 129 |
self.Bind(wx.EVT_SIZE, self.OnSize) |
| 130 |
self.Bind(wx.EVT_IDLE, self.OnIdle) |
| 131 |
|
| 132 |
def __del__(self): |
| 133 |
wx.Window.__del__(self) |
| 134 |
ViewPort.__del__(self) |
| 135 |
|
| 136 |
def PreviewBitmap(self): |
| 137 |
return self.bitmap |
| 138 |
|
| 139 |
def PanTool(self): |
| 140 |
"""Start the canvas pan tool""" |
| 141 |
self.SelectTool(CanvasPanTool(self)) |
| 142 |
|
| 143 |
def SetMap(self, map): |
| 144 |
redraw_channels = (MAP_LAYERS_CHANGED, LAYER_CHANGED, |
| 145 |
LAYER_VISIBILITY_CHANGED) |
| 146 |
if self.Map() is not None: |
| 147 |
for channel in redraw_channels: |
| 148 |
self.Map().Unsubscribe(channel, self.full_redraw) |
| 149 |
|
| 150 |
ViewPort.SetMap(self, map) |
| 151 |
|
| 152 |
if self.Map() is not None: |
| 153 |
for channel in redraw_channels: |
| 154 |
self.Map().Subscribe(channel, self.full_redraw) |
| 155 |
|
| 156 |
# force a redraw. If map is not empty, it's already been called |
| 157 |
# by FitMapToWindow but if map is empty it hasn't been called |
| 158 |
# yet so we have to explicitly call it. |
| 159 |
self.full_redraw() |
| 160 |
|
| 161 |
def OnPaint(self, event): |
| 162 |
dc = wx.PaintDC(self) |
| 163 |
if self.Map() is not None and self.Map().HasLayers(): |
| 164 |
if self.bitmap is not None: |
| 165 |
dc.BeginDrawing() |
| 166 |
dc.DrawBitmap(self.bitmap, 0, 0) |
| 167 |
if self.selection_bitmap is not None: |
| 168 |
dc.DrawBitmap(self.selection_bitmap, 0, 0, True) |
| 169 |
dc.EndDrawing() |
| 170 |
else: |
| 171 |
# If we've got no map or if the map is empty, simply clear |
| 172 |
# the screen. |
| 173 |
|
| 174 |
# XXX it's probably possible to get rid of this. The |
| 175 |
# background color of the window is already white and the |
| 176 |
# only thing we may have to do is to call self.Refresh() |
| 177 |
# with a true argument in the right places. |
| 178 |
dc.BeginDrawing() |
| 179 |
dc.SetBackground(self.backgroundColor) |
| 180 |
dc.Clear() |
| 181 |
dc.EndDrawing() |
| 182 |
|
| 183 |
def OnIdle(self, event): |
| 184 |
"""Idle handler. Redraw the bitmap if necessary""" |
| 185 |
if (self.Map() is not None |
| 186 |
and (self.bitmap is None |
| 187 |
or self.render_iter is not None |
| 188 |
or (self.HasSelectedShapes() |
| 189 |
and self.selection_bitmap is None))): |
| 190 |
event.RequestMore(self._do_redraw()) |
| 191 |
|
| 192 |
def _do_redraw(self): |
| 193 |
"""Redraw a bit and return whether this method has to be called again. |
| 194 |
|
| 195 |
Called by OnIdle to handle the actual redraw. Redraw is |
| 196 |
incremental for both the bitmap with the normal layers and the |
| 197 |
bitmap with the selection. |
| 198 |
""" |
| 199 |
finished = False |
| 200 |
if self.render_iter is not None: |
| 201 |
try: |
| 202 |
if self.render_iter.next(): |
| 203 |
# Redraw if the last preview redraw was some time |
| 204 |
# ago and the user is not currently dragging the |
| 205 |
# mouse because redrawing would interfere with what |
| 206 |
# the current tool is drawing on the window. |
| 207 |
if not self.dragging \ |
| 208 |
and time.time() - self.render_last_preview > 0.5: |
| 209 |
client_dc = wx.ClientDC(self) |
| 210 |
client_dc.BeginDrawing() |
| 211 |
client_dc.DrawBitmap(self.bitmap, 0, 0) |
| 212 |
client_dc.EndDrawing() |
| 213 |
self.render_last_preview = time.time() |
| 214 |
else: |
| 215 |
self.render_iter = None |
| 216 |
# Redraw if not dragging because redrawing would |
| 217 |
# interfere with what the current tool is drawing on |
| 218 |
# the window. |
| 219 |
if not self.dragging: |
| 220 |
self.redraw() |
| 221 |
finished = True |
| 222 |
except StopIteration: |
| 223 |
finished = True |
| 224 |
self.render_iter = None |
| 225 |
except: |
| 226 |
finished = True |
| 227 |
self.render_iter = None |
| 228 |
traceback.print_exc() |
| 229 |
else: |
| 230 |
self.render_iter = self._render_iterator() |
| 231 |
self.render_last_preview = time.time() |
| 232 |
return not finished |
| 233 |
|
| 234 |
def _render_iterator(self): |
| 235 |
width, height = self.GetSizeTuple() |
| 236 |
dc = wx.MemoryDC() |
| 237 |
|
| 238 |
render_start = time.time() |
| 239 |
|
| 240 |
if self.bitmap is None: |
| 241 |
self.bitmap = wx.EmptyBitmap(width, height) |
| 242 |
dc.SelectObject(self.bitmap) |
| 243 |
dc.BeginDrawing() |
| 244 |
|
| 245 |
dc.SetBackground(self.backgroundColor) |
| 246 |
dc.Clear() |
| 247 |
|
| 248 |
# draw the map into the bitmap |
| 249 |
renderer = ScreenRenderer(dc, self.Map(), self.scale, self.offset, |
| 250 |
(0, 0, width, height)) |
| 251 |
for cont in renderer.RenderMapIncrementally(): |
| 252 |
yield True |
| 253 |
|
| 254 |
dc.EndDrawing() |
| 255 |
dc.SelectObject(wx.NullBitmap) |
| 256 |
|
| 257 |
if self.HasSelectedShapes() and self.selection_bitmap is None: |
| 258 |
bitmap = wx.EmptyBitmap(width, height) |
| 259 |
dc.SelectObject(bitmap) |
| 260 |
dc.BeginDrawing() |
| 261 |
dc.SetBackground(wx.WHITE_BRUSH) |
| 262 |
dc.Clear() |
| 263 |
|
| 264 |
renderer = ScreenRenderer(dc, self.Map(), self.scale, self.offset, |
| 265 |
(0, 0, width, height)) |
| 266 |
layer = self.SelectedLayer() |
| 267 |
shapes = self.selection.SelectedShapes() |
| 268 |
for cont in renderer.draw_selection_incrementally(layer, shapes): |
| 269 |
yield True |
| 270 |
|
| 271 |
dc.EndDrawing() |
| 272 |
dc.SelectObject(wx.NullBitmap) |
| 273 |
|
| 274 |
bitmap.SetMask(wx.Mask(bitmap, wx.WHITE)) |
| 275 |
self.selection_bitmap = bitmap |
| 276 |
|
| 277 |
yield False |
| 278 |
|
| 279 |
def Export(self): |
| 280 |
|
| 281 |
if hasattr(self, "export_path"): |
| 282 |
export_path = self.export_path |
| 283 |
else: |
| 284 |
export_path="." |
| 285 |
dlg = wx.FileDialog(self, _("Export Map"), export_path, "", |
| 286 |
"Enhanced Metafile (*.wmf)|*.wmf", |
| 287 |
wx.SAVE|wx.OVERWRITE_PROMPT) |
| 288 |
if dlg.ShowModal() == wx.ID_OK: |
| 289 |
self.export_path = os.path.dirname(dlg.GetPath()) |
| 290 |
dc = wx.MetaFileDC(dlg.GetPath()) |
| 291 |
|
| 292 |
scale, offset, mapregion = output_transform(self.scale, |
| 293 |
self.offset, |
| 294 |
self.GetSizeTuple(), |
| 295 |
dc.GetSizeTuple()) |
| 296 |
|
| 297 |
selected_layer = self.selection.SelectedLayer() |
| 298 |
selected_shapes = self.selection.SelectedShapes() |
| 299 |
|
| 300 |
width, height = self.GetSizeTuple() |
| 301 |
renderer = ExportRenderer(dc, self.Map(), scale, offset, |
| 302 |
region = (0, 0, |
| 303 |
(width/self.scale)*scale, |
| 304 |
(height/self.scale)*scale), |
| 305 |
destination_region = mapregion) |
| 306 |
renderer.RenderMap(selected_layer, selected_shapes) |
| 307 |
|
| 308 |
dc.EndDrawing() |
| 309 |
dc.Close() |
| 310 |
dlg.Destroy() |
| 311 |
|
| 312 |
def Print(self): |
| 313 |
printer = wx.Printer() |
| 314 |
width, height = self.GetSizeTuple() |
| 315 |
selected_layer = self.selection.SelectedLayer() |
| 316 |
selected_shapes = self.selection.SelectedShapes() |
| 317 |
|
| 318 |
printout = MapPrintout(self, self.Map(), (0, 0, width, height), |
| 319 |
selected_layer, selected_shapes) |
| 320 |
printer.Print(self, printout, True) |
| 321 |
printout.Destroy() |
| 322 |
|
| 323 |
def redraw(self, *args): |
| 324 |
self.Refresh(False) |
| 325 |
|
| 326 |
def full_redraw(self, *args): |
| 327 |
self.bitmap = None |
| 328 |
self.selection_bitmap = None |
| 329 |
self.render_iter = None |
| 330 |
self.redraw() |
| 331 |
|
| 332 |
def redraw_selection(self, *args): |
| 333 |
self.selection_bitmap = None |
| 334 |
self.render_iter = None |
| 335 |
self.redraw() |
| 336 |
|
| 337 |
def map_projection_changed(self, map, old_proj): |
| 338 |
ViewPort.map_projection_changed(self, map, old_proj) |
| 339 |
self.full_redraw() |
| 340 |
|
| 341 |
def layer_projection_changed(self, *args): |
| 342 |
ViewPort.layer_projection_changed(self, args) |
| 343 |
self.full_redraw() |
| 344 |
|
| 345 |
def set_view_transform(self, scale, offset): |
| 346 |
ViewPort.set_view_transform(self, scale, offset) |
| 347 |
self.full_redraw() |
| 348 |
|
| 349 |
def GetPortSizeTuple(self): |
| 350 |
return self.GetSizeTuple() |
| 351 |
|
| 352 |
def OnMiddleDown(self, event): |
| 353 |
self.remembertool = self.tool |
| 354 |
if self.Map() is not None and self.Map().HasLayers(): |
| 355 |
self.PanTool() |
| 356 |
self.OnLeftDown(event) |
| 357 |
|
| 358 |
def OnMiddleUp(self, event): |
| 359 |
self.OnLeftUp(event) |
| 360 |
if self.remembertool: |
| 361 |
self.SelectTool(self.remembertool) |
| 362 |
|
| 363 |
def OnLeftDown(self, event): |
| 364 |
self.MouseLeftDown(event) |
| 365 |
if self.tool is not None: |
| 366 |
self.drag_dc = wx.ClientDC(self) |
| 367 |
self.drag_dc.SetLogicalFunction(wx.INVERT) |
| 368 |
self.drag_dc.SetBrush(wx.TRANSPARENT_BRUSH) |
| 369 |
self.tool.Show(self.drag_dc) |
| 370 |
self.CaptureMouse() |
| 371 |
self.dragging = 1 |
| 372 |
|
| 373 |
def OnLeftUp(self, event): |
| 374 |
"""Handle EVT_LEFT_UP |
| 375 |
|
| 376 |
Release the mouse if it was captured, if a tool is active call |
| 377 |
its Hide method and call self.MouseLeftUp. |
| 378 |
""" |
| 379 |
# It's important that ReleaseMouse is called before MouseLeftUp. |
| 380 |
# MouseLeftUp may pop up modal dialogs which leads to an |
| 381 |
# effectively frozen X session because the user can only |
| 382 |
# interact with the dialog but the mouse is still grabbed by the |
| 383 |
# canvas. |
| 384 |
if self.dragging: |
| 385 |
if self.HasCapture(): |
| 386 |
self.ReleaseMouse() |
| 387 |
try: |
| 388 |
self.tool.Hide(self.drag_dc) |
| 389 |
finally: |
| 390 |
self.drag_dc = None |
| 391 |
self.dragging = 0 |
| 392 |
self.MouseLeftUp(event) |
| 393 |
|
| 394 |
def OnMotion(self, event): |
| 395 |
if self.dragging: |
| 396 |
self.tool.Hide(self.drag_dc) |
| 397 |
|
| 398 |
self.MouseMove(event) |
| 399 |
|
| 400 |
if self.dragging: |
| 401 |
self.tool.Show(self.drag_dc) |
| 402 |
|
| 403 |
def OnLeaveWindow(self, event): |
| 404 |
self.set_current_position(None) |
| 405 |
|
| 406 |
def OnSize(self, event): |
| 407 |
# the window's size has changed. We have to get a new bitmap. If |
| 408 |
# we want to be clever we could try to get by without throwing |
| 409 |
# everything away. E.g. when the window gets smaller, we could |
| 410 |
# either keep the bitmap or create the new one from the old one. |
| 411 |
# Even when the window becomes larger some parts of the bitmap |
| 412 |
# could be reused. |
| 413 |
self.full_redraw() |
| 414 |
|
| 415 |
def shape_selected(self, layer, shape): |
| 416 |
"""Receiver for the SHAPES_SELECTED messages. Redraw the map.""" |
| 417 |
# The selection object takes care that it only issues |
| 418 |
# SHAPES_SELECTED messages when the set of selected shapes has |
| 419 |
# actually changed, so we can do a full redraw of the |
| 420 |
# selection_bitmap unconditionally. |
| 421 |
ViewPort.shape_selected(self, layer, shape) |
| 422 |
self.redraw_selection() |
| 423 |
|
| 424 |
def GetTextExtent(self, text): |
| 425 |
dc = wx.ClientDC(self) |
| 426 |
font = wx.Font(10, wx.SWISS, wx.NORMAL, wx.NORMAL) |
| 427 |
dc.SetFont(font) |
| 428 |
return dc.GetTextExtent(text.decode('iso-8859-1')) |
| 429 |
|
| 430 |
def LabelShapeAt(self, x, y, text=None): |
| 431 |
"""Add or remove a label at window position x, y. |
| 432 |
|
| 433 |
If there's a label at the given position, remove it. Otherwise |
| 434 |
determine the shape at the position, run the label dialog and |
| 435 |
unless the user cancels the dialog, add a label. |
| 436 |
""" |
| 437 |
layer, shape_index = self.find_shape_at(x, y, select_labels = 1) |
| 438 |
if layer is None and shape_index is not None: |
| 439 |
ViewPort.LabelShapeAt(self, x, y) |
| 440 |
elif layer is not None: |
| 441 |
text = labeldialog.run_label_dialog(self, |
| 442 |
layer.ShapeStore().Table(), |
| 443 |
shape_index) |
| 444 |
ViewPort.LabelShapeAt(self, x, y, text) |
| 445 |
|
| 446 |
|
Parent Directory
| 
Revision Log