updated to utils th plot and convert to image solution

utils.py

@@ -208,4 +208,70 @@ def html_to_image(html_path, img_path, width=800, height=600, delay=2, driver_pa
         print(f"Image saved to: {img_path}")
     except Exception as e:
         print(f"Error converting HTML to image: {e}")
-        driver.quit()
+        driver.quit()
+
+def process_preview_util(
+    project_name,
+    RESOURCES_FOLDER,
+    label,
+    progress,
+    popup,
+    preview_image_widget,
+    set_preview_image_path,
+    Clock,
+    width=800,
+    height=600
+):
+    import folium
+    import os
+    import json
+    from utils import html_to_image
+
+    try:
+        project_folder = os.path.join(RESOURCES_FOLDER, "projects", project_name)
+        positions_path = os.path.join(project_folder, "positions.json")
+        html_path = os.path.join(project_folder, "preview.html")
+        img_path = os.path.join(project_folder, "preview.png")
+
+        if not os.path.exists(positions_path):
+            label.text = "positions.json not found!"
+            progress.value = 100
+            return
+
+        with open(positions_path, "r") as f:
+            positions = json.load(f)
+
+        if not positions:
+            label.text = "No positions to preview."
+            progress.value = 100
+            return
+
+        coords = [(pos['latitude'], pos['longitude']) for pos in positions]
+        m = folium.Map(
+            location=coords[0],
+            width=width,
+            height=height
+        )
+        folium.PolyLine(coords, color="blue", weight=4.5, opacity=1).add_to(m)
+        folium.Marker(coords[0], tooltip="Start", icon=folium.Icon(color="green")).add_to(m)
+        folium.Marker(coords[-1], tooltip="End", icon=folium.Icon(color="red")).add_to(m)
+        m.fit_bounds(coords)
+        m.save(html_path)
+
+        html_to_image(html_path, img_path, width=width, height=height)
+
+        set_preview_image_path(img_path)
+        preview_image_widget.reload()
+        label.text = "Preview ready!"
+        progress.value = 100
+
+        def close_popup(dt):
+            popup.dismiss()
+        Clock.schedule_once(close_popup, 1)
+
+    except Exception as e:
+        label.text = f"Error: {e}"
+        progress.value = 100
+        def close_popup(dt):
+            popup.dismiss()
+        Clock.schedule_once(close_popup, 2)