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A tiny optimization to ImLineClosestPoint. Removed unnecessary sqrtf call.

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ab_lenSqr -> ab_len_sqr
Moved line where ab_len_sqr is computed after the first return
This commit is contained in:
Podgorskiy
2018-02-21 23:18:25 -05:00
parent 16ff9faf51
commit 94466745bb
1 changed files with 3 additions and 4 deletions
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7
imgui.cpp
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@@ -950,14 +950,13 @@ ImVec2 ImLineClosestPoint(const ImVec2& a, const ImVec2& b, const ImVec2& p)
{ {
ImVec2 ap = p - a; ImVec2 ap = p - a;
ImVec2 ab_dir = b - a; ImVec2 ab_dir = b - a;
float ab_len = sqrtf(ab_dir.x * ab_dir.x + ab_dir.y * ab_dir.y);
ab_dir *= 1.0f / ab_len;
float dot = ap.x * ab_dir.x + ap.y * ab_dir.y; float dot = ap.x * ab_dir.x + ap.y * ab_dir.y;
if (dot < 0.0f) if (dot < 0.0f)
return a; return a;
if (dot > ab_len) float ab_len_sqr = ab_dir.x * ab_dir.x + ab_dir.y * ab_dir.y;
if (dot > ab_len_sqr)
return b; return b;
return a + ab_dir * dot; return a + ab_dir * dot / ab_len_sqr;
} }
bool ImTriangleContainsPoint(const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& p) bool ImTriangleContainsPoint(const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& p)