fix: resuse temp directory

ORStools/gui/ORStoolsDialog.py

@@ -469,7 +469,8 @@ def __init__(self, iface, parent=None):
         self.checkBox_elevation_profile.toggled.connect(self.toggle_elevation_profile)
 
     def update_elevation_profile(self):
-        Elevation(self).make_image()
+        elev = Elevation(self)
+        elev.make_image()
 
     def toggle_elevation_profile(self):
         if self.routing_fromline_list.count() not in [0, 1]:

ORStools/utils/elevation.py

@@ -52,7 +52,6 @@ def __init__(self, dlg):
         self.route = None
 
         self.base()
-        self.make_image()
 
     def base(self):
         basepath = os.path.dirname(__file__)
@@ -200,7 +199,17 @@ def make_image(self):
             ax.set_xlabel("Distance [km]")
             ax.set_ylabel("Elevation [m]")
 
-            temp_dir = tempfile.mkdtemp(prefix="ORS_qgis_plugin_")
+            present = None
+            prefix = "ORS_qgis_plugin_"
+            for dirpath, dirnames, filenames in os.walk(tempfile.gettempdir()):
+                for dirname in dirnames:
+                    if prefix in dirname:
+                        temp_dir = os.path.join(dirpath, dirname)
+                        present = True
+
+            if not present:
+                temp_dir = tempfile.mkdtemp(prefix=prefix)
+
             temp_image_path = os.path.join(temp_dir, "elevation_profile.jpg")
             fig.savefig(temp_image_path, dpi=100)