1 files changed, 140 insertions, 0 deletions
diff --git a/tools/source/generic/line.cxx b/tools/source/generic/line.cxx
new file mode 100644
index 000000000..26465c5c8
--- /dev/null
+++ b/tools/source/generic/line.cxx
@@ -0,0 +1,140 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <tools/line.hxx>
+#include <tools/helpers.hxx>
+
+#include <cmath>
+
+namespace tools
+{
+
+double Line::GetLength() const
+{
+    return hypot( maStart.X() - maEnd.X(), maStart.Y() - maEnd.Y() );
+}
+
+bool Line::Intersection( const Line& rLine, Point& rIntersection ) const
+{
+    double  fX, fY;
+    bool    bRet;
+
+    if( Intersection( rLine, fX, fY ) )
+    {
+        rIntersection.setX( FRound( fX ) );
+        rIntersection.setY( FRound( fY ) );
+        bRet = true;
+    }
+    else
+        bRet = false;
+
+    return bRet;
+}
+
+bool Line::Intersection( const tools::Line& rLine, double& rIntersectionX, double& rIntersectionY ) const
+{
+    const double    fAx = maEnd.X() - maStart.X();
+    const double    fAy = maEnd.Y() - maStart.Y();
+    const double    fBx = rLine.maStart.X() - rLine.maEnd.X();
+    const double    fBy = rLine.maStart.Y() - rLine.maEnd.Y();
+    const double    fDen = fAy * fBx - fAx * fBy;
+    bool            bOk = false;
+
+    if( fDen != 0. )
+    {
+        const double    fCx = maStart.X() - rLine.maStart.X();
+        const double    fCy = maStart.Y() - rLine.maStart.Y();
+        const double    fA = fBy * fCx - fBx * fCy;
+        const bool      bGreater = ( fDen > 0. );
+
+        bOk = true;
+
+        if ( bGreater )
+        {
+            if ( ( fA < 0. ) || ( fA > fDen ) )
+                bOk = false;
+        }
+        else if ( ( fA > 0. ) || ( fA < fDen ) )
+            bOk = false;
+
+        if ( bOk )
+        {
+            const double fB = fAx * fCy - fAy * fCx;
+
+            if ( bGreater )
+            {
+                if ( ( fB < 0. ) || ( fB > fDen ) )
+                    bOk = false;
+            }
+            else if ( ( fB > 0. ) || ( fB < fDen ) )
+                bOk = false;
+
+            if( bOk )
+            {
+                const double fAlpha = fA / fDen;
+
+                rIntersectionX = ( maStart.X() + fAlpha * fAx );
+                rIntersectionY = ( maStart.Y() + fAlpha * fAy );
+            }
+        }
+    }
+
+    return bOk;
+}
+
+double Line::GetDistance( const double& rPtX, const double& rPtY ) const
+{
+    double fDist;
+
+    if( maStart != maEnd )
+    {
+        const double    fDistX = maEnd.X() - maStart.X();
+        const double    fDistY = maEnd.Y() - maStart.Y();
+        const double    fACX = maStart.X() - rPtX;
+        const double    fACY = maStart.Y() - rPtY;
+        const double    fL2 = fDistX * fDistX + fDistY * fDistY;
+        const double    fR = ( fACY * -fDistY - fACX * fDistX ) / fL2;
+        const double    fS = ( fACY * fDistX - fACX * fDistY ) / fL2;
+
+        if( fR < 0.0 )
+        {
+            fDist = hypot( maStart.X() - rPtX, maStart.Y() - rPtY );
+
+            if( fS < 0.0 )
+                fDist *= -1.0;
+        }
+        else if( fR <= 1.0 )
+            fDist = fS * sqrt( fL2 );
+        else
+        {
+            fDist = hypot( maEnd.X() - rPtX, maEnd.Y() - rPtY );
+
+            if( fS < 0.0 )
+                fDist *= -1.0;
+        }
+    }
+    else
+        fDist = hypot( maStart.X() - rPtX, maStart.Y() - rPtY );
+
+    return fDist;
+}
+
+} //namespace tools
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */