Pan the widget pan the map.

diff --git a/src/gtkmapserver.c b/src/gtkmapserver.c
index 617cd6f781d7ad4a7bf7482b3de3702c22b9d731..cbd940d6a3763a77fc8820c871402e79854ed3b7 100644 (file)
--- a/src/gtkmapserver.c
+++ b/src/gtkmapserver.c
@@ -85,8 +85,8 @@ struct _GtkMapserverPrivate
                GString *url_no_ext;
                GtkMapserverExtent *ext;
                GtkMapserverExtent *ext_cur;
-               gdouble ext_scale_x;
-               gdouble ext_scale_y;
+               gdouble canvas_to_ext_x;
+               gdouble canvas_to_ext_y;
 
                gdouble sel_x_start;
                gdouble sel_y_start;
@@ -143,8 +143,9 @@ gtk_mapserver_init (GtkMapserver *gtk_mapserver)
        priv->url_no_ext = NULL;
        priv->ext = NULL;
        priv->ext_cur = NULL;
-       priv->ext_scale_x = 0.0;
-       priv->ext_scale_y = 0.0;
+
+       priv->canvas_to_ext_x = 0.0;
+       priv->canvas_to_ext_y = 0.0;
 
        priv->sel_x_start = 0.0;
        priv->sel_y_start = 0.0;
@@ -501,6 +502,9 @@ gtk_mapserver_draw (GtkMapserver *gtkm)
 
        gtk_widget_get_allocation (GTK_WIDGET (gtkm), &allocation);
 
+       priv->canvas_to_ext_x = (priv->ext_cur->maxx - priv->ext_cur->minx) / allocation.width;
+       priv->canvas_to_ext_y = (priv->ext_cur->maxy - priv->ext_cur->miny) / allocation.height;
+
        goo_canvas_item_get_simple_transform (priv->img,
                                                                                  &x,
                                                                                  &y,
@@ -531,7 +535,6 @@ gtk_mapserver_draw (GtkMapserver *gtkm)
        g_object_set (G_OBJECT (priv->img),
                                  "pixbuf", pixbuf,
                                  NULL);
-
        g_free (_url);
 }
 
@@ -647,6 +650,8 @@ gtk_mapserver_on_key_release_event (GooCanvasItem *item,
                                        gdouble y;
                                        gdouble scale;
                                        gdouble rotation;
+                                       gdouble ext_scale_x;
+                                       gdouble ext_scale_y;
 
                                        goo_canvas_item_get_simple_transform (priv->img,
                                                                                                                  &x,
@@ -660,13 +665,13 @@ gtk_mapserver_on_key_release_event (GooCanvasItem *item,
                                                                                                                  rotation);
                                        gtk_mapserver_center_map (gtkm);
 
-                                       priv->ext_scale_x = ((priv->ext_cur->maxx - priv->ext_cur->minx) * SCALE) / 2;
-                                       priv->ext_scale_y = ((priv->ext_cur->maxy - priv->ext_cur->miny) * SCALE) / 2;
+                                       ext_scale_x = ((priv->ext_cur->maxx - priv->ext_cur->minx) * SCALE) / 2;
+                                       ext_scale_y = ((priv->ext_cur->maxy - priv->ext_cur->miny) * SCALE) / 2;
 
-                                       priv->ext_cur->minx += priv->ext_scale_x;
-                                       priv->ext_cur->miny += priv->ext_scale_y;
-                                       priv->ext_cur->maxx -= priv->ext_scale_x;
-                                       priv->ext_cur->maxy -= priv->ext_scale_y;
+                                       priv->ext_cur->minx += ext_scale_x;
+                                       priv->ext_cur->miny += ext_scale_y;
+                                       priv->ext_cur->maxx -= ext_scale_x;
+                                       priv->ext_cur->maxy -= ext_scale_y;
 
                                        gtk_mapserver_event_occurred (gtkm);
 
@@ -680,6 +685,8 @@ gtk_mapserver_on_key_release_event (GooCanvasItem *item,
                                        gdouble y;
                                        gdouble scale;
                                        gdouble rotation;
+                                       gdouble ext_scale_x;
+                                       gdouble ext_scale_y;
 
                                        goo_canvas_item_get_simple_transform (priv->img,
                                                                                                                  &x,
@@ -693,13 +700,13 @@ gtk_mapserver_on_key_release_event (GooCanvasItem *item,
                                                                                                                  rotation);
                                        gtk_mapserver_center_map (gtkm);
 
-                                       priv->ext_scale_x = ((priv->ext_cur->maxx - priv->ext_cur->minx) * SCALE) / 2;
-                                       priv->ext_scale_y = ((priv->ext_cur->maxy - priv->ext_cur->miny) * SCALE) / 2;
+                                       ext_scale_x = ((priv->ext_cur->maxx - priv->ext_cur->minx) * SCALE) / 2;
+                                       ext_scale_y = ((priv->ext_cur->maxy - priv->ext_cur->miny) * SCALE) / 2;
 
-                                       priv->ext_cur->minx -= priv->ext_scale_x;
-                                       priv->ext_cur->miny -= priv->ext_scale_y;
-                                       priv->ext_cur->maxx += priv->ext_scale_x;
-                                       priv->ext_cur->maxy += priv->ext_scale_y;
+                                       priv->ext_cur->minx -= ext_scale_x;
+                                       priv->ext_cur->miny -= ext_scale_y;
+                                       priv->ext_cur->maxx += ext_scale_x;
+                                       priv->ext_cur->maxy += ext_scale_y;
 
                                        gtk_mapserver_event_occurred (gtkm);
 
@@ -715,10 +722,10 @@ gtk_mapserver_on_button_press_event (GtkWidget *widget,
                                                                         GdkEventButton *event,
                                                                         gpointer user_data)
 {
-       GtkMapserver *gtk_mapserver = GTK_MAPSERVER (user_data);
-       GtkMapserverPrivate *priv = GTK_MAPSERVER_GET_PRIVATE (gtk_mapserver);
+       GtkMapserver *gtkm = GTK_MAPSERVER (user_data);
+       GtkMapserverPrivate *priv = GTK_MAPSERVER_GET_PRIVATE (gtkm);
 
-       goo_canvas_grab_focus (GOO_CANVAS (gtk_mapserver), priv->img);
+       goo_canvas_grab_focus (GOO_CANVAS (gtkm), priv->img);
 
        if (event->button == 1)
                {
@@ -732,8 +739,30 @@ gtk_mapserver_on_button_release_event (GtkWidget *widget,
                                                                           GdkEventButton *event,
                                                                           gpointer user_data)
 {
-       GtkMapserver *gtk_mapserver = GTK_MAPSERVER (user_data);
-       GtkMapserverPrivate *priv = GTK_MAPSERVER_GET_PRIVATE (gtk_mapserver);
+       GtkMapserver *gtkm = GTK_MAPSERVER (user_data);
+       GtkMapserverPrivate *priv = GTK_MAPSERVER_GET_PRIVATE (gtkm);
+
+       gdouble x;
+       gdouble y;
+       gdouble scale;
+       gdouble rotation;
+
+       goo_canvas_item_get_simple_transform (priv->img,
+                                                                                 &x,
+                                                                                 &y,
+                                                                                 &scale,
+                                                                                 &rotation);
+
+       if (x == 0.0 && y == 0.0)
+               {
+                       return FALSE;
+               }
+       priv->ext_cur->minx -= (x * priv->canvas_to_ext_x);
+       priv->ext_cur->miny += (y * priv->canvas_to_ext_y);
+       priv->ext_cur->maxx -= (x * priv->canvas_to_ext_x);
+       priv->ext_cur->maxy += (y * priv->canvas_to_ext_y);
+
+       gtk_mapserver_event_occurred (gtkm);
 }
 
 static gboolean
@@ -745,8 +774,8 @@ gtk_mapserver_on_motion_notify_event (GtkWidget *widget,
        gint y;
        GdkModifierType state;
 
-       GtkMapserver *gtk_mapserver = GTK_MAPSERVER (user_data);
-       GtkMapserverPrivate *priv = GTK_MAPSERVER_GET_PRIVATE (gtk_mapserver);
+       GtkMapserver *gtkm = GTK_MAPSERVER (user_data);
+       GtkMapserverPrivate *priv = GTK_MAPSERVER_GET_PRIVATE (gtkm);
 
        if (event->is_hint)
                {