GPencil: Alt-S can now be used to adjust the pressure values (i.e. thickness) of strokes

source/blender/editors/gpencil/gpencil_ops.c

@@ -210,6 +210,10 @@ static void ed_keymap_gpencil_editing(wmKeyConfig *keyconf)
 	WM_keymap_add_item(keymap, "TRANSFORM_OT_shear", SKEY, KM_PRESS, KM_ALT | KM_CTRL | KM_SHIFT, 0);
 	RNA_boolean_set(kmi->ptr, "gpencil_strokes", true);
 	
+	kmi = WM_keymap_add_item(keymap, "TRANSFORM_OT_transform", SKEY, KM_PRESS, KM_ALT, 0);
+	RNA_enum_set(kmi->ptr, "mode", TFM_GPENCIL_SHRINKFATTEN);
+	RNA_boolean_set(kmi->ptr, "gpencil_strokes", true);
+	
 	/* Proportional Editing */
 	ED_keymap_proportional_cycle(keyconf, keymap);
 	ED_keymap_proportional_editmode(keyconf, keymap, true);

source/blender/editors/include/ED_transform.h

@@ -73,6 +73,7 @@ enum TfmMode {
 	TFM_BONE_ENVELOPE,
 	TFM_CURVE_SHRINKFATTEN,
 	TFM_MASK_SHRINKFATTEN,
+	TFM_GPENCIL_SHRINKFATTEN,
 	TFM_BONE_ROLL,
 	TFM_TIME_TRANSLATE,
 	TFM_TIME_SLIDE,

source/blender/editors/transform/transform.c

@@ -139,6 +139,9 @@ static void applyCurveShrinkFatten(TransInfo *t, const int mval[2]);
 static void initMaskShrinkFatten(TransInfo *t);
 static void applyMaskShrinkFatten(TransInfo *t, const int mval[2]);
 
+static void initGPShrinkFatten(TransInfo *t);
+static void applyGPShrinkFatten(TransInfo *t, const int mval[2]);
+
 static void initTrackball(TransInfo *t);
 static void applyTrackball(TransInfo *t, const int mval[2]);
 
@@ -2165,6 +2168,9 @@ bool initTransform(bContext *C, TransInfo *t, wmOperator *op, const wmEvent *eve
 		case TFM_MASK_SHRINKFATTEN:
 			initMaskShrinkFatten(t);
 			break;
+		case TFM_GPENCIL_SHRINKFATTEN:
+			initGPShrinkFatten(t);
+			break;
 		case TFM_TRACKBALL:
 			initTrackball(t);
 			break;
@@ -4668,6 +4674,83 @@ static void applyMaskShrinkFatten(TransInfo *t, const int UNUSED(mval[2]))
 /** \} */
 
 
+/* -------------------------------------------------------------------- */
+/* Transform (GPencil Shrink/Fatten) */
+
+/** \name Transform GPencil Strokes Shrink/Fatten
+ * \{ */
+
+static void initGPShrinkFatten(TransInfo *t)
+{
+	t->mode = TFM_GPENCIL_SHRINKFATTEN;
+	t->transform = applyGPShrinkFatten;
+
+	initMouseInputMode(t, &t->mouse, INPUT_SPRING);
+
+	t->idx_max = 0;
+	t->num.idx_max = 0;
+	t->snap[0] = 0.0f;
+	t->snap[1] = 0.1f;
+	t->snap[2] = t->snap[1] * 0.1f;
+
+	copy_v3_fl(t->num.val_inc, t->snap[1]);
+	t->num.unit_sys = t->scene->unit.system;
+	t->num.unit_type[0] = B_UNIT_NONE;
+
+	t->flag |= T_NO_ZERO;
+#ifdef USE_NUM_NO_ZERO
+	t->num.val_flag[0] |= NUM_NO_ZERO;
+#endif
+
+	t->flag |= T_NO_CONSTRAINT;
+}
+
+static void applyGPShrinkFatten(TransInfo *t, const int UNUSED(mval[2]))
+{
+	TransData *td = t->data;
+	float ratio;
+	int i;
+	char str[MAX_INFO_LEN];
+
+	ratio = t->values[0];
+
+	snapGridIncrement(t, &ratio);
+
+	applyNumInput(&t->num, &ratio);
+
+	/* header print for NumInput */
+	if (hasNumInput(&t->num)) {
+		char c[NUM_STR_REP_LEN];
+
+		outputNumInput(&(t->num), c, &t->scene->unit);
+		BLI_snprintf(str, MAX_INFO_LEN, IFACE_("Shrink/Fatten: %s"), c);
+	}
+	else {
+		BLI_snprintf(str, MAX_INFO_LEN, IFACE_("Shrink/Fatten: %3f"), ratio);
+	}
+
+	for (i = 0; i < t->total; i++, td++) {
+		if (td->flag & TD_NOACTION)
+			break;
+
+		if (td->flag & TD_SKIP)
+			continue;
+
+		if (td->val) {
+			*td->val = td->ival * ratio;
+			/* apply PET */
+			*td->val = (*td->val * td->factor) + ((1.0f - td->factor) * td->ival);
+			if (*td->val <= 0.0f) *td->val = 0.001f;
+		}
+	}
+
+	recalcData(t);
+
+	ED_area_headerprint(t->sa, str);
+}
+/** \} */
+
+
 /* -------------------------------------------------------------------- */
 /* Transform (Push/Pull) */
 

source/blender/editors/transform/transform_conversions.c

@@ -7502,6 +7502,12 @@ static void createTransGPencil(bContext *C, TransInfo *t)
 							
 							if (pt->flag & GP_SPOINT_SELECT)
 								td->flag |= TD_SELECTED;
+								
+							/* for other transform modes (e.g. shrink-fatten), need to additional data */
+							if (t->mode == TFM_GPENCIL_SHRINKFATTEN) {
+								td->val = &pt->pressure;
+								td->ival = pt->pressure;
+							}
 							
 							/* configure 2D points so that they don't play up... */
 							if (gps->flag & (GP_STROKE_2DSPACE | GP_STROKE_2DIMAGE)) {

source/blender/editors/transform/transform_ops.c

@@ -142,6 +142,7 @@ EnumPropertyItem transform_mode_types[] =
 	{TFM_BONE_ENVELOPE, "BONE_ENVELOPE", 0, "Bone_Envelope", ""},
 	{TFM_CURVE_SHRINKFATTEN, "CURVE_SHRINKFATTEN", 0, "Curve_Shrinkfatten", ""},
 	{TFM_MASK_SHRINKFATTEN, "MASK_SHRINKFATTEN", 0, "Mask_Shrinkfatten", ""},
+	{TFM_GPENCIL_SHRINKFATTEN, "GPENCIL_SHRINKFATTEN", 0, "GPencil_Shrinkfatten", ""},
 	{TFM_BONE_ROLL, "BONE_ROLL", 0, "Bone_Roll", ""},
 	{TFM_TIME_TRANSLATE, "TIME_TRANSLATE", 0, "Time_Translate", ""},
 	{TFM_TIME_SLIDE, "TIME_SLIDE", 0, "Time_Slide", ""},
@@ -974,7 +975,7 @@ static void TRANSFORM_OT_transform(struct wmOperatorType *ot)
 
 	RNA_def_float_vector(ot->srna, "value", 4, NULL, -FLT_MAX, FLT_MAX, "Values", "", -FLT_MAX, FLT_MAX);
 
-	Transform_Properties(ot, P_AXIS | P_CONSTRAINT | P_PROPORTIONAL | P_MIRROR | P_ALIGN_SNAP);
+	Transform_Properties(ot, P_AXIS | P_CONSTRAINT | P_PROPORTIONAL | P_MIRROR | P_ALIGN_SNAP | P_GPENCIL_EDIT);
 }
 
 void transform_operatortypes(void)