GPencil: New Dots gradient

This commit adds support for drawing Dots strokes with a gradient factor to get artistic effects like watercolor.

Currently, the option is only supported by Dots materials, and in the future will be added to line strokes, but now there is a limitation on drawing engine and we will keep disabled on Line materials.

Also, added the option to align Dots and Boxes strokes textures aligned with the drawing path to get more fluid strokes.

1 files changed, 18 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_gpencil.c b/source/blender/makesrna/intern/rna_gpencil.c
index 73203beb3e2..d154f8de4ad 100644
--- a/source/blender/makesrna/intern/rna_gpencil.c
+++ b/source/blender/makesrna/intern/rna_gpencil.c
@@ -998,6 +998,24 @@ static void rna_def_gpencil_stroke(BlenderRNA *brna)
 	RNA_def_property_ui_text(prop, "Thickness", "Thickness of stroke (in pixels)");
 	RNA_def_property_update(prop, NC_GPENCIL | ND_DATA, "rna_GPencil_update");
 
+	/* gradient control along y */
+	prop = RNA_def_property(srna, "gradient_factor", PROP_FLOAT, PROP_FACTOR);
+	RNA_def_property_float_sdna(prop, NULL, "gradient_f");
+	RNA_def_property_range(prop, 0.001f, 1.0f);
+	RNA_def_property_float_default(prop, 1.0f);
+	RNA_def_property_ui_text(prop, "Border Opacity Factor",
+		"Amount of gradient along section of stroke");
+	RNA_def_parameter_clear_flags(prop, PROP_ANIMATABLE, 0);
+	RNA_def_property_update(prop, NC_GPENCIL | ND_DATA, "rna_GPencil_update");
+
+	/* gradient shape ratio */
+	prop = RNA_def_property(srna, "gradient_shape", PROP_FLOAT, PROP_XYZ);
+	RNA_def_property_float_sdna(prop, NULL, "gradient_s");
+	RNA_def_property_array(prop, 2);
+	RNA_def_property_range(prop, 0.01f, 1.0f);
+	RNA_def_property_float_default(prop, 1.0f);
+	RNA_def_property_ui_text(prop, "Aspect Ratio", "");
+	RNA_def_property_update(prop, NC_GPENCIL | ND_DATA, "rna_GPencil_update");
 }
 
 static void rna_def_gpencil_strokes_api(BlenderRNA *brna, PropertyRNA *cprop)