add tests to timeseries

README.md

@@ -192,6 +192,7 @@ The test suite includes:
 - **test_colormaps**: Color mapping functions
 - **test_term_render_mode**: Terminal render mode parsing/cycling helpers
 - **test_range_popup**: Range popup logic (symmetric computation, value parsing)
+- **test_timeseries**: Time series reading, multi-file concatenation, and CF time unit conversion
 - **test_file_netcdf**: NetCDF file I/O
 - **test_file_zarr**: Zarr file I/O (when built with `WITH_ZARR=1`)
 - **test_integration**: End-to-end workflow tests
@@ -211,6 +212,12 @@ The test suite includes:
   - **Minimum/Maximum**: Editable text fields for exact values
   - **Symmetric about Zero**: Sets range to [-max(|min|,|max|), max(|min|,|max|)]
   - **Reset to Global Values**: Restores the variable's full data range
+- **Time series plot**: Click on the image to show a time series popup at that location:
+  - Displays value vs time for the selected variable at the clicked grid point
+  - Y-axis with numeric tick labels, X-axis with CF time date formatting (when detected)
+  - Blue data line with dots at data points; gaps shown for fill/missing values
+  - Works with both single files and multi-file datasets
+  - When files have different time epochs, values are automatically normalized to a common reference
 - **Dimension panel**: Shows dimension names, ranges, current values
 - **Colorbar**: Min/max and intermediate labels update as you adjust range
 

tests/Makefile

@@ -47,7 +47,7 @@ endif
 SRCDIR = ../src
 
 # Test executables
-TEST_TARGETS = test_kdtree test_mesh test_regrid test_colormaps test_file_netcdf test_integration test_term_render_mode test_range_popup
+TEST_TARGETS = test_kdtree test_mesh test_regrid test_colormaps test_file_netcdf test_integration test_term_render_mode test_range_popup test_timeseries
 
 # Add zarr test if enabled
 ifdef WITH_ZARR
@@ -103,6 +103,9 @@ RANGE_UTILS_OBJ = $(SRCDIR)/interface/range_utils.c
 test_range_popup: test_range_popup.c $(RANGE_UTILS_OBJ)
 	$(CC) $(CFLAGS) -o $@ $^ $(LIBS)
 
+test_timeseries: test_timeseries.c $(FILE_NETCDF_OBJ) $(MESH_DEPS) $(KDTREE_OBJ)
+	$(CC) $(CFLAGS) -o $@ $^ $(LIBS)
+
 # Zarr test (only built with WITH_ZARR=1)
 test_file_zarr: test_file_zarr.c $(FILE_ZARR_OBJ) $(CJSON_OBJ) $(MESH_DEPS) $(KDTREE_OBJ)
 	$(CC) $(CFLAGS) -o $@ $^ $(LIBS)
@@ -157,6 +160,9 @@ test-term-render-mode: test_term_render_mode
 test-range-popup: test_range_popup
 	./test_range_popup
 
+test-timeseries: test_timeseries
+	./test_timeseries
+
 test-zarr: test_file_zarr
 	./test_file_zarr
 
@@ -194,6 +200,7 @@ help:
 	@echo "  test-integration - Run Integration tests only"
 	@echo "  test-term-render-mode - Run terminal render mode tests only"
 	@echo "  test-range-popup - Run range popup logic tests only"
+	@echo "  test-timeseries  - Run timeseries reading tests only"
 	@echo "  memcheck     - Run valgrind memory check on all tests"
 	@echo "  clean        - Remove test executables and temp files"
 	@echo "  help         - Show this help message"