[Bf-blender-cvs] [b22204fa370] master: Cleanup: Simplify vector direction comparison

[Antonio Vazquez]

Commit: b22204fa370d93e4b484407942d35aaa2ad986a1
Author: Antonio Vazquez
Date:   Wed Feb 24 16:43:18 2021 +0100
Branches: master
https://developer.blender.org/rBb22204fa370d93e4b484407942d35aaa2ad986a1

Cleanup: Simplify vector direction comparison

Multiply the two number together. If the sign of the result is positive, then the sign was the same. If the sign of the result is negative, then the signs were different.

===================================================================

M	source/blender/editors/gpencil/gpencil_interpolate.c

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diff --git a/source/blender/editors/gpencil/gpencil_interpolate.c b/source/blender/editors/gpencil/gpencil_interpolate.c
index ff5ce7101f1..ae3dae326c0 100644
--- a/source/blender/editors/gpencil/gpencil_interpolate.c
+++ b/source/blender/editors/gpencil/gpencil_interpolate.c
@@ -237,8 +237,8 @@ static bool gpencil_stroke_need_flip(Depsgraph *depsgraph,
     float v1[2], v2[2];
     sub_v2_v2v2(v1, v_from_end, v_from_start);
     sub_v2_v2v2(v2, v_to_end, v_to_start);
-    if (((v1[0] > 0.0f && v2[0] < 0.0f) || (v1[0] < 0.0f && v2[0] > 0.0f)) &&
-        ((v1[1] > 0.0f && v2[1] < 0.0f) || (v1[1] < 0.0f && v2[1] > 0.0f))) {
+    mul_v2_v2v2(v1, v1, v2);
+    if ((v1[0] < 0.0f) && (v1[1] < 0.0f)) {
       return true;
     }
   }