Transform: map mouse input to shear direction

1 files changed, 12 insertions, 0 deletions

diff --git a/source/blender/editors/transform/transform_input.c b/source/blender/editors/transform/transform_input.c
index 971b9f74c65..cdac18f7584 100644
--- a/source/blender/editors/transform/transform_input.c
+++ b/source/blender/editors/transform/transform_input.c
@@ -137,6 +137,18 @@ void setCustomPoints(TransInfo *UNUSED(t), MouseInput *mi, const int mval_start[
 	data[3] = mval_end[1];
 }
 
+void setCustomPointsFromDirection(TransInfo *t, MouseInput *mi, const float dir[2])
+{
+	BLI_ASSERT_UNIT_V2(dir);
+	const int win_axis = t->ar ? ((abs(t->ar->winx * dir[0]) + abs(t->ar->winy * dir[1])) / 2) : 1;
+	const int mval_start[2] = {
+		mi->imval[0] + dir[0] * win_axis,
+		mi->imval[1] + dir[1] * win_axis,
+	};
+	const int mval_end[2] = {mi->imval[0], mi->imval[1]};
+	setCustomPoints(t, mi, mval_start, mval_end);
+}
+
 static void InputCustomRatioFlip(TransInfo *UNUSED(t), MouseInput *mi, const double mval[2], float output[3])
 {
 	double length;