Geography : New marker layer with variable marker size.

svn: r19834

src/plugins/lib/maps/markerlayer.py

@@ -0,0 +1,162 @@
+# -*- python -*-
+# -*- coding: utf-8 -*-
+#
+# Gramps - a GTK+/GNOME based genealogy program
+#
+# Copyright (C) 2011-2012       Serge Noiraud
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+#
+
+# $Id: grampsmaps.py 18399 2011-11-02 17:15:20Z noirauds $
+
+#-------------------------------------------------------------------------
+#
+# Python modules
+#
+#-------------------------------------------------------------------------
+import os
+import gobject
+from math import *
+
+#------------------------------------------------------------------------
+#
+# Set up logging
+#
+#------------------------------------------------------------------------
+import logging
+_LOG = logging.getLogger("maps.marker")
+
+#-------------------------------------------------------------------------
+#
+# GTK/Gnome modules
+#
+#-------------------------------------------------------------------------
+import gtk
+
+#-------------------------------------------------------------------------
+#
+# Gramps Modules
+#
+#-------------------------------------------------------------------------
+import const
+import cairo
+
+#-------------------------------------------------------------------------
+#
+# osmGpsMap
+#
+#-------------------------------------------------------------------------
+
+try:
+    import osmgpsmap
+except:
+    raise
+
+class MarkerLayer(gobject.GObject, osmgpsmap.GpsMapLayer):
+    """
+    This is the layer used to display the markers.
+    """
+    def __init__(self):
+        """
+        Initialize the layer
+        """
+        gobject.GObject.__init__(self)
+        self.markers = []
+        self.max_references = 0
+        self.max_places = 0
+        self.nb_ref_by_places = 0
+        self.max_value = 0
+        self.min_value = 9999
+
+    def clear_markers(self):
+        """
+        reset the layer attributes.
+        """
+        self.markers = []
+        self.max_references = 0
+        self.max_places = 0
+        self.nb_ref_by_places = 0
+        self.max_value = 0
+        self.min_value = 9999
+
+    def add_marker(self, points, image, count):
+        """
+        Add a track or life marker.
+        """
+        self.markers.append((points, image, count))
+        self.max_references += count
+        self.max_places += 1
+        if count > self.max_value:
+            self.max_value = count
+        if count < self.min_value:
+            self.min_value = count
+        self.nb_ref_by_places = self.max_references / self.max_places
+
+    def do_draw(self, gpsmap, drawable):
+        """
+        Draw all tracks or life markers.
+        """
+        ctx = drawable.cairo_create()
+        max_interval = self.max_value - self.nb_ref_by_places
+        min_interval = self.nb_ref_by_places - self.min_value  
+        if min_interval == 0:
+            min_interval = 0.01
+        for marker in self.markers:
+            ctx.save()
+            # the icon size in 48, so the standard icon size is 0.6 * 48 = 28.8
+            size = 0.6
+            if float(marker[2]) > self.nb_ref_by_places:
+                # at maximum, we'll have an icon size = (0.6 + 0.3) * 48 = 43.2
+                size += ( 0.3 * ( ( float(marker[2]) - self.nb_ref_by_places )/ max_interval) )
+            else:
+                # at minimum, we'll have an icon size = (0.6 - 0.3) * 48 = 14.4
+                size -= ( 0.3 * ( ( self.nb_ref_by_places - float(marker[2]) )/ min_interval) )
+
+            conv_pt = osmgpsmap.point_new_degrees(float(marker[0][0]),
+                                                  float(marker[0][1]))
+            coord_x, coord_y = gpsmap.convert_geographic_to_screen(conv_pt)
+            ctx.translate(coord_x, coord_y)
+            ctx.scale( size, size)
+            # below, we must found one solution to place exactly the marker
+            # depending on its size. Normaly, the left top of the image is set to the coordinates
+            # The tip of the pin which should be at the marker position is at 3/18 of the width.
+            # rounding problem ?
+            posY = - (( 48 * size + 5 ) / ( 16.0 / 18.0 )) - 2
+            posX = - (( 48 * size + 5 ) / 6 ) - 2 # 6 <= 3/18 = 1/6
+            ctx.set_source_pixbuf(marker[1], posX, posY)
+            ctx.paint()
+            ctx.restore()
+
+    def do_render(self, gpsmap):
+        """
+        render the layer
+        """
+        pass
+
+    def do_busy(self):
+        """
+        set the layer busy
+        """
+        return False
+
+    def do_button_press(self, gpsmap, gdkeventbutton):
+        """
+        When we press a button.
+        """
+        return False
+
+gobject.type_register(MarkerLayer)
+