grass.jupyter: add SeriesMap and tests (OSGeo#3036)

SeriesMap creates a ipywidgets Slider for scrolling between a list of rasters and/or vectors.

python/.pylintrc

@@ -95,7 +95,8 @@ disable=raw-checker-failed,
         file-ignored,
         suppressed-message,
         deprecated-pragma,
-        use-symbolic-message-instead
+        use-symbolic-message-instead,
+        duplicate-code
 
 # Enable the message, report, category or checker with the given id(s). You can
 # either give multiple identifier separated by comma (,) or put this option

python/grass/jupyter/Makefile

@@ -11,6 +11,7 @@ MODULES = \
 	interactivemap \
 	region \
 	map3d \
+	seriesmap \
 	reprojection_renderer \
 	utils \
 	timeseriesmap

python/grass/jupyter/__init__.py

@@ -103,3 +103,4 @@
 from .map3d import Map3D
 from .setup import init
 from .timeseriesmap import TimeSeriesMap
+from .seriesmap import SeriesMap

python/grass/jupyter/region.py

@@ -215,6 +215,78 @@ def set_region_from_command(self, module, **kwargs):
             return
 
 
+class RegionManagerForSeries:
+    """Region manager for SeriesMap"""
+
+    def __init__(self, use_region, saved_region, width, height, env):
+        """Manages region during rendering.
+
+        :param use_region: if True, use either current or provided saved region,
+                          else derive region from rendered layers
+        :param saved_region: if name of saved_region is provided,
+                            this region is then used for rendering
+        :param width: rendering width
+        :param height: rendering height
+        :param env: environment for rendering
+        """
+        self._env = env
+        self._width = width
+        self._height = height
+        self._use_region = use_region
+        self._saved_region = saved_region
+        self._extent_set = False
+        self._resolution_set = False
+
+    def set_region_from_rasters(self, rasters):
+        """Sets computational region for rendering from a series of rasters.
+
+        This function sets the region from a series of rasters. If the extent or
+        resolution has already been set by calling this function previously or by the
+        set_region_from vectors() function, this function will not modify it.
+
+        If user specified the name of saved region during object's initialization,
+        the provided region is used. If it's not specified
+        and use_region=True, current region is used.
+        """
+        if self._saved_region:
+            self._env["GRASS_REGION"] = gs.region_env(
+                region=self._saved_region, env=self._env
+            )
+            return
+        if self._use_region:
+            # use current
+            return
+        if self._resolution_set and self._extent_set:
+            return
+        if not self._resolution_set and not self._extent_set:
+            self._env["GRASS_REGION"] = gs.region_env(raster=rasters, env=self._env)
+            self._extent_set = True
+            self._resolution_set = True
+        elif not self._resolution_set:
+            self._env["GRASS_REGION"] = gs.region_env(align=rasters[0], env=self._env)
+            self._resolution_set = True
+
+    def set_region_from_vectors(self, vectors):
+        """Sets computational region extent for rendering from a series of vectors
+
+        If the extent and resolution has already been set by set_region_from_rasters,
+        or by using the saved_region or use_region arguments, the region is not modified
+        """
+        if self._saved_region:
+            self._env["GRASS_REGION"] = gs.region_env(
+                region=self._saved_region, env=self._env
+            )
+            return
+        if self._use_region:
+            # use current
+            return
+        if self._resolution_set and self._extent_set:
+            return
+        if not self._resolution_set and not self._extent_set:
+            self._env["GRASS_REGION"] = gs.region_env(vector=vectors, env=self._env)
+            self._extent_set = True
+
+
 class RegionManagerFor3D:
     """Region manager for 3D displays (gets region from m.nviz.image command)"""