From 5dec06277e22ff050bc978adb7095cd597c85d35 Mon Sep 17 00:00:00 2001
From: mauro <alberti.m65@gmail.com>
Date: Sun, 19 Aug 2018 11:48:57 +0200
Subject: [PATCH] Vers. 0.4.2 RC 1

---
 config/settings.py   |  3 +++
 gis_utils/profile.py |  1 +
 qProf_QWidget.py     | 23 +++++++++++++++++++++--
 qProf_main.py        | 14 ++++++++++++++
 4 files changed, 39 insertions(+), 2 deletions(-)
 create mode 100644 config/settings.py

diff --git a/config/settings.py b/config/settings.py
new file mode 100644
index 0000000..1dc7074
--- /dev/null
+++ b/config/settings.py
@@ -0,0 +1,3 @@
+
+
+pt_num_threshold = 10000
\ No newline at end of file
diff --git a/gis_utils/profile.py b/gis_utils/profile.py
index a8dbf89..342742d 100644
--- a/gis_utils/profile.py
+++ b/gis_utils/profile.py
@@ -267,6 +267,7 @@ def topoline_from_dem(resampled_trace2d, bOnTheFlyProjection, project_crs, dem,
 
 def topoprofiles_from_dems(canvas, source_profile_line, sample_distance, selected_dems, selected_dem_parameters,
                            invert_profile):
+    
     # get project CRS information
     on_the_fly_projection, project_crs = get_on_the_fly_projection(canvas)
 
diff --git a/qProf_QWidget.py b/qProf_QWidget.py
index 088e50e..b5ab187 100644
--- a/qProf_QWidget.py
+++ b/qProf_QWidget.py
@@ -29,6 +29,7 @@
 
 from .string_utils.utils_string import clean_string
 
+from .config.settings import *
 from .config.output import dem_header_common, dem_single_dem_header, gpx_header
 
 from .qProf_plotting import plot_geoprofiles
@@ -69,7 +70,6 @@ def __init__(self, plugin_name, canvas):
         self.profile_windows = []  # used to maintain alive the plots, i.e. to avoid the C++ objects being destroyed
 
         self.plane_attitudes_colors = []
-        #self.curve_colors = []
 
         self.setup_gui()
 
@@ -207,6 +207,25 @@ def stop_rubberband():
 
             if topo_source_type == self.demline_source:  # sources are DEM(s) and line
 
+                # check total number of points in line(s) to create
+                estimated_total_num_pts = 0
+                for profile_line in source_profile_lines:
+
+                    profile_length = profile_line.length_2d
+                    profile_num_pts = profile_length / sample_distance
+                    estimated_total_num_pts += profile_num_pts
+
+                estimated_total_num_pts = int(ceil(estimated_total_num_pts))
+
+                if estimated_total_num_pts > pt_num_threshold:
+                    warn(
+                        parent=self,
+                        header=self.plugin_name,
+                        msg="There are {} estimated points (limit is {}) in profile(s) to create.".format(estimated_total_num_pts, pt_num_threshold) +
+                            "\nPlease increase sample distance value"
+                    )
+                    return
+
                 for profile_line in source_profile_lines:
 
                     try:
@@ -265,7 +284,7 @@ def stop_rubberband():
             else:  # source error
                 error(self,
                       self.plugin_name,
-                     "Algorithm error: profile calculation not defined")
+                     "Debug: profile calculation not defined")
                 return
 
             info(self,
diff --git a/qProf_main.py b/qProf_main.py
index 2dd7b8c..3e36e7e 100644
--- a/qProf_main.py
+++ b/qProf_main.py
@@ -3,13 +3,18 @@
 import os
 import webbrowser
 
+from qgis.core import *
+
 from qgis.PyQt.QtCore import *
 from qgis.PyQt.QtGui import *
 from qgis.PyQt.QtWidgets import *
 
 from . import resources
 
+
+from .qt_utils.tools import info, warn, error, update_ComboBox
 from .qgis_utils.utils import create_action
+
 from .qProf_QWidget import qprof_QWidget
 
 _plugin_name_ = "qProf"
@@ -45,6 +50,15 @@ def unload(self):
 
     def open_qprof(self):
 
+        project = QgsProject.instance()
+
+        if project.count() == 0:
+            warn(
+                parent=None,
+                header=_plugin_name_,
+                msg="No project/layer available.\nPlease open project and add layers.")
+            return
+
         qprof_DockWidget = QDockWidget(self.plugin_name,
                                        self.interface.mainWindow())
         qprof_DockWidget.setAttribute(Qt.WA_DeleteOnClose)