Added to the Parameter Editor mode new stroke geometry modifier `Blueprint'

that produces a blueprint using circular, elliptic, and square contour strokes.
Related changes and bug fixes were made as follows:

* The randomness in radius and center has been transformed into optional
parameters of the pyBluePrintCirclesShader and pyBluePrintEllipsesShader.
Also a new optional parameter to control the randomness of backbone
stretching has been added to the pyBluePrintSquaresShader.

* A bug in the pyBluePrintSquaresShader that invisible stroke vertices at
corners of rectangular contour strokes were not properly drawn.  The problem
was due to the changes of the / operator between Python 2.x to 3.x.  Even
when the two operands of the division operator are integers, Python 3.x
gives a floating-point number when the quotient is not an integer.  The fix
was just to replace the / operator by the // operator for integer division.

* An unpleasant discontinuity in circular and elliptical contour strokes
was fixed.

* The length parameter of the Backbone Stretcher geometry modifier has been
renamed to `backbone_length' in line with the parameter of the same name in
the pyBluePrintSquaresShader.

1 files changed, 20 insertions, 2 deletions

diff --git a/source/blender/makesdna/DNA_linestyle_types.h b/source/blender/makesdna/DNA_linestyle_types.h
index a34a4285e55..a73dd707caa 100644
--- a/source/blender/makesdna/DNA_linestyle_types.h
+++ b/source/blender/makesdna/DNA_linestyle_types.h
@@ -64,7 +64,8 @@ typedef struct LineStyleModifier {
 #define LS_MODIFIER_CALLIGRAPHY            13
 #define LS_MODIFIER_POLYGONIZATION         14
 #define LS_MODIFIER_GUIDING_LINES          15
-#define LS_MODIFIER_NUM                    16
+#define LS_MODIFIER_BLUEPRINT              16
+#define LS_MODIFIER_NUM                    17
 
 /* LineStyleModifier::flags */
 #define LS_MODIFIER_ENABLED     1
@@ -284,7 +285,7 @@ typedef struct LineStyleGeometryModifier_PerlinNoise2D {
 typedef struct LineStyleGeometryModifier_BackboneStretcher {
 	struct LineStyleModifier modifier;
 
-	float amount;
+	float backbone_length;
 	int pad;
 
 } LineStyleGeometryModifier_BackboneStretcher;
@@ -313,6 +314,23 @@ typedef struct LineStyleGeometryModifier_GuidingLines {
 
 } LineStyleGeometryModifier_GuidingLines;
 
+/* LineStyleGeometryModifier_BluePrintLines::shape */
+#define LS_MODIFIER_BLUEPRINT_CIRCLES   1
+#define LS_MODIFIER_BLUEPRINT_ELLIPSES  2
+#define LS_MODIFIER_BLUEPRINT_SQUARES   4
+
+typedef struct LineStyleGeometryModifier_Blueprint {
+	struct LineStyleModifier modifier;
+
+	int flags;
+	unsigned int rounds;
+	float backbone_length;
+	unsigned int random_radius;
+	unsigned int random_center;
+	unsigned int random_backbone;
+
+} LineStyleGeometryModifier_Blueprint;
+
 /* Calligraphic thickness modifier */
 
 typedef struct LineStyleThicknessModifier_Calligraphy {