[Backport release_3.34] More images to visualize expressions (#9122)

docs/user_manual/expressions/expression_help/GeometryGroup.rst

@@ -1518,6 +1518,12 @@ Returns the portion of a line (or curve) geometry which falls between the specif
  - * ``geom_to_wkt(line_substring(geometry:=geom_from_wkt('LineString(0 0, 10 0)'),start_distance:=2,end_distance:=6))`` → 'LineString (2 0,6 0)'
 
 
+.. figure:: /docs/user_manual/processing_algs/qgis/img/substring.png
+ :align: center
+ :width: 100%
+
+ Substring line with starting distance set at 0 meters and the ending distance at 250 meters.
+
 .. end_line_substring_section
 
 .. _expression_function_GeometryGroup_m:
@@ -2810,6 +2816,12 @@ Simplifies a geometry by removing nodes using a distance based threshold (ie, th
  - * ``geom_to_wkt(simplify(geometry:=geom_from_wkt('LineString(0 0, 5 0.1, 10 0)'),tolerance:=5))`` → 'LineString(0 0, 10 0)'
 
 
+.. figure:: /docs/user_manual/processing_algs/qgis/img/simplify_geometries.png
+ :align: center
+ :width: 100%
+
+ From left to right, source layer and increasing simplification tolerances
+
 .. end_simplify_section
 
 .. _expression_function_GeometryGroup_simplify_vw:
@@ -2944,6 +2956,12 @@ Constructs square/rectangular waves along the boundary of a geometry.
  - * ``square_wave(geom_from_wkt('LineString(0 0, 10 0)'), 3, 1)`` → Square waves with wavelength 3 and amplitude 1 along the linestring
 
 
+.. figure:: /docs/user_manual/expressions/expression_help/img/square_wave.*
+ :align: center
+ :width: 100%
+
+ Symbolizing features with square waves
+
 .. end_square_wave_section
 
 .. _expression_function_GeometryGroup_square_wave_randomized:
@@ -2971,6 +2989,12 @@ Constructs randomized square/rectangular waves along the boundary of a geometry.
  - * ``square_wave_randomized(geom_from_wkt('LineString(0 0, 10 0)'), 2, 3, 0.1, 0.2)`` → Randomly sized square waves with wavelengths between 2 and 3 and amplitudes between 0.1 and 0.2 along the linestring
 
 
+.. figure:: /docs/user_manual/expressions/expression_help/img/square_wave_randomized.*
+ :align: center
+ :width: 100%
+
+ Symbolizing features with square randomized waves
+
 .. end_square_wave_randomized_section
 
 .. _expression_function_GeometryGroup_start_point:
@@ -3161,6 +3185,12 @@ Constructs triangular waves along the boundary of a geometry.
  - * ``triangular_wave(geom_from_wkt('LineString(0 0, 10 0)'), 3, 1)`` → Triangular waves with wavelength 3 and amplitude 1 along the linestring
 
 
+.. figure:: /docs/user_manual/expressions/expression_help/img/triangular_wave.*
+ :align: center
+ :width: 100%
+
+ Symbolizing features with triangular waves
+
 .. end_triangular_wave_section
 
 .. _expression_function_GeometryGroup_triangular_wave_randomized:
@@ -3188,6 +3218,12 @@ Constructs randomized triangular waves along the boundary of a geometry.
  - * ``triangular_wave_randomized(geom_from_wkt('LineString(0 0, 10 0)'), 2, 3, 0.1, 0.2)`` → Randomly sized triangular waves with wavelengths between 2 and 3 and amplitudes between 0.1 and 0.2 along the linestring
 
 
+.. figure:: /docs/user_manual/expressions/expression_help/img/triangular_wave_randomized.*
+ :align: center
+ :width: 100%
+
+ Symbolizing features with triangular randomized waves
+
 .. end_triangular_wave_randomized_section
 
 .. _expression_function_GeometryGroup_union:
@@ -3234,6 +3270,12 @@ Constructs rounded (sine-like) waves along the boundary of a geometry.
  - * ``wave(geom_from_wkt('LineString(0 0, 10 0)'), 3, 1)`` → Sine-like waves with wavelength 3 and amplitude 1 along the linestring
 
 
+.. figure:: /docs/user_manual/expressions/expression_help/img/wave.*
+ :align: center
+ :width: 100%
+
+ Symbolizing features with waves
+
 .. end_wave_section
 
 .. _expression_function_GeometryGroup_wave_randomized:
@@ -3261,6 +3303,12 @@ Constructs randomized curved (sine-like) waves along the boundary of a geometry.
  - * ``wave_randomized(geom_from_wkt('LineString(0 0, 10 0)'), 2, 3, 0.1, 0.2)`` → Randomly sized curved waves with wavelengths between 2 and 3 and amplitudes between 0.1 and 0.2 along the linestring
 
 
+.. figure:: /docs/user_manual/expressions/expression_help/img/wave_randomized.*
+ :align: center
+ :width: 100%
+
+ Symbolizing features with randomized waves
+
 .. end_wave_randomized_section
 
 .. _expression_function_GeometryGroup_wedge_buffer:
@@ -3287,6 +3335,12 @@ Returns a wedge shaped buffer originating from a point geometry.
  - * ``wedge_buffer(center:=geom_from_wkt('POINT(1 2)'),azimuth:=90,width:=180,outer_radius:=1)`` → A wedge shaped buffer centered on the point (1,2), facing to the East, with a width of 180 degrees and outer radius of 1.
 
 
+.. figure:: /docs/user_manual/processing_algs/qgis/img/wedge_buffers.png
+ :align: center
+ :width: 100%
+
+ Wedge buffering features
+
 .. end_wedge_buffer_section
 
 .. _expression_function_GeometryGroup_within:

docs/user_manual/expressions/expression_help/img/images_list.json

@@ -41,6 +41,10 @@
  "caption": "Interpolated point at 500m of the beginning of the line",
  "img": "",
  "alg_img": "interpolated_point" },
+ "expression_function_GeometryGroup_line_substring": {
+ "caption": "Substring line with starting distance set at 0 meters and the ending distance at 250 meters.",
+ "img": "",
+ "alg_img": "substring" },
  "expression_function_GeometryGroup_offset_curve": {
  "caption": "In blue the source layer, in red the offset one",
  "img": "",
@@ -61,6 +65,10 @@
  "caption": "Rotating features",
  "img": "rotate",
  "alg_img": "" },
+ "expression_function_GeometryGroup_simplify": {
+ "caption": "From left to right, source layer and increasing simplification tolerances",
+ "img": "",
+ "alg_img": "simplify_geometries" },
  "expression_function_GeometryGroup_single_sided_buffer": {
  "caption": "Left versus right side buffer on the same vector line layer",
  "img": "",
@@ -69,12 +77,40 @@
  "caption": "Increasing number of iterations causes smoother geometries",
  "img": "",
  "alg_img": "smooth_geometry_1" },
+ "expression_function_GeometryGroup_square_wave": {
+ "caption": "Symbolizing features with square waves",
+ "img": "square_wave",
+ "alg_img": "" },
+ "expression_function_GeometryGroup_square_wave_randomized": {
+ "caption": "Symbolizing features with square randomized waves",
+ "img": "square_wave_randomized",
+ "alg_img": "" },
  "expression_function_GeometryGroup_tapered_buffer": {
  "caption": "Tapered buffer on line features",
  "img": "",
  "alg_img": "tapered_buffer" },
  "expression_function_GeometryGroup_translate": {
  "caption": "Translating features",
  "img": "",
- "alg_img": "translate_geometry" }
+ "alg_img": "translate_geometry" },
+ "expression_function_GeometryGroup_triangular_wave": {
+ "caption": "Symbolizing features with triangular waves",
+ "img": "triangular_wave",
+ "alg_img": "" },
+ "expression_function_GeometryGroup_triangular_wave_randomized": {
+ "caption": "Symbolizing features with triangular randomized waves",
+ "img": "triangular_wave_randomized",
+ "alg_img": "" },
+ "expression_function_GeometryGroup_wave": {
+ "caption": "Symbolizing features with waves",
+ "img": "wave",
+ "alg_img": "" },
+ "expression_function_GeometryGroup_wave_randomized": {
+ "caption": "Symbolizing features with randomized waves",
+ "img": "wave_randomized",
+ "alg_img": "" },
+ "expression_function_GeometryGroup_wedge_buffer": {
+ "caption": "Wedge buffering features",
+ "img": "",
+ "alg_img": "wedge_buffers" }
 }

docs/user_manual/processing_algs/qgis/vectorgeometry.rst

@@ -6145,8 +6145,7 @@ distance based (the "Douglas-Peucker" algorithm), area based
 .. figure:: img/simplify_geometries.png
  :align: center
 
- Clockwise from top left: source layer and increasing
- simplification tolerances
+ From left to right, source layer and increasing simplification tolerances
 
 |checkbox| Allows :ref:`features in-place modification <processing_inplace_edit>`
 of line and polygon features