From ce28e056c20bf2723f565bbf464b87781ec248a2 Mon Sep 17 00:00:00 2001
From: Jacek Antonelli
Date: Fri, 15 Aug 2008 23:45:42 -0500
Subject: Second Life viewer sources 1.20.2

---
 linden/indra/llmath/llline.h | 75 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 linden/indra/llmath/llline.h

(limited to 'linden/indra/llmath/llline.h')

diff --git a/linden/indra/llmath/llline.h b/linden/indra/llmath/llline.h
new file mode 100644
index 0000000..ca454c5
--- /dev/null
+++ b/linden/indra/llmath/llline.h
@@ -0,0 +1,75 @@
+// llline.h
+/**
+ * @file llline.cpp
+ * @author Andrew Meadows
+ * @brief Simple line for computing nearest approach between two infinite lines
+ *
+ * $LicenseInfo:firstyear=2006&license=internal$
+ * 
+ * Copyright (c) 2006-2008, Linden Research, Inc.
+ * 
+ * The following source code is PROPRIETARY AND CONFIDENTIAL. Use of
+ * this source code is governed by the Linden Lab Source Code Disclosure
+ * Agreement ("Agreement") previously entered between you and Linden
+ * Lab. By accessing, using, copying, modifying or distributing this
+ * software, you acknowledge that you have been informed of your
+ * obligations under the Agreement and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_LINE_H
+#define LL_LINE_H
+
+#include <iostream>
+#include "stdtypes.h"
+#include "v3math.h"
+
+const F32 DEFAULT_INTERSECTION_ERROR = 0.000001f;
+
+class LLLine
+{
+public:
+	LLLine();
+	LLLine( const LLVector3& first_point, const LLVector3& second_point );
+	virtual ~LLLine() {};
+
+	void setPointDirection( const LLVector3& first_point, const LLVector3& second_point );
+	void setPoints( const LLVector3& first_point, const LLVector3& second_point );
+
+	bool intersects( const LLVector3& point, F32 radius = DEFAULT_INTERSECTION_ERROR ) const;
+
+	// returns the point on this line that is closest to some_point
+	LLVector3 nearestApproach( const LLVector3& some_point ) const;
+
+	// returns the point on this line that is closest to other_line
+	LLVector3 nearestApproach( const LLLine& other_line ) const;
+
+	friend std::ostream& operator<<( std::ostream& output_stream, const LLLine& line );
+
+	// returns 'true' if this line intersects the plane
+	// on success stores the intersection point in 'result'
+	bool intersectsPlane( LLVector3& result, const LLLine& plane ) const;
+
+	// returns 'true' if planes intersect, and stores the result 
+	// the second and third arguments are treated as planes
+	// where mPoint is on the plane and mDirection is the normal
+	// result.mPoint will be the intersection line's closest approach 
+	// to first_plane.mPoint
+	static bool getIntersectionBetweenTwoPlanes( LLLine& result, const LLLine& first_plane, const LLLine& second_plane );
+
+	const LLVector3& getPoint() const { return mPoint; }
+	const LLVector3& getDirection() const { return mDirection; }
+
+protected:
+	// these are protected because some code assumes that the normal is 
+	// always correct and properly normalized.
+	LLVector3 mPoint;
+	LLVector3 mDirection;
+};
+
+
+#endif
-- 
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