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authortoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
committertoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
commit47d455dd55be855e4cc691c32f687f723d9247ee (patch)
tree52e236aaa2576bdb3840ebede26619692fed6d7d /kpovmodeler/pmsplinesegment.h
downloadtdegraphics-47d455dd55be855e4cc691c32f687f723d9247ee.tar.gz
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Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.
BUG:215923 git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdegraphics@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
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+//-*-C++-*-
+/*
+**************************************************************************
+ description
+ --------------------
+ copyright : (C) 2002 by Andreas Zehender
+ email : zehender@kde.org
+**************************************************************************
+
+**************************************************************************
+* *
+* This program is free software; you can redistribute it and/or modify *
+* it under the terms of the GNU General Public License as published by *
+* the Free Software Foundation; either version 2 of the License, or *
+* (at your option) any later version. *
+* *
+**************************************************************************/
+
+
+#ifndef PMSPLINESEGMENT_H
+#define PMSPLINESEGMENT_H
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "pmvector.h"
+#include <qvaluelist.h>
+
+/**
+ * Helper class for splines
+ *
+ * Each instance of this class represents one spline segment. A point
+ * on the segment is given by the equation
+ *
+ * fi(t) = A[i] * t^3 + B[i] * t^2 + C[i] * t + D[i]
+ *
+ * with t ranging from 0 to 1.
+ */
+class PMSplineSegment
+{
+public:
+ /**
+ * Standard constructor
+ */
+ PMSplineSegment( )
+ {
+ m_a[0] = m_b[0] = m_c[0] = m_d[0] = 0.0;
+ m_a[1] = m_b[1] = m_c[1] = m_d[1] = 0.0;
+ }
+ /**
+ * Copy constructor
+ */
+ PMSplineSegment( const PMSplineSegment& s )
+ {
+ int i;
+ for( i = 0; i < 2; i++ )
+ {
+ m_a[i] = s.m_a[i];
+ m_b[i] = s.m_b[i];
+ m_c[i] = s.m_c[i];
+ m_d[i] = s.m_d[i];
+ }
+ }
+ /**
+ * Assigns s to the segment
+ */
+ PMSplineSegment& operator= ( const PMSplineSegment& s )
+ {
+ int i;
+ for( i = 0; i < 2; i++ )
+ {
+ m_a[i] = s.m_a[i];
+ m_b[i] = s.m_b[i];
+ m_c[i] = s.m_c[i];
+ m_d[i] = s.m_d[i];
+ }
+ return *this;
+ }
+
+ /**
+ * Returns a 2D vector with the point on the spline segment
+ */
+ PMVector point( double t ) const;
+ /**
+ * Returns the gradient on the spline
+ */
+ PMVector gradient( double t ) const;
+
+ /**
+ * Calculates the spline parameters for the linear spline type
+ */
+ void calculateLinear( const PMVector& p1, const PMVector& p2 );
+ /**
+ * Calculates the spline parameters for the quadratic spline type
+ */
+ void calculateQuadratic( const PMVector& p1, const PMVector& p2,
+ const PMVector& p3 );
+ /**
+ * Calculates the spline parameters for the cubic spline type
+ */
+ void calculateCubic( const PMVector& p1, const PMVector& p2,
+ const PMVector& p3, const PMVector& p4 );
+ /**
+ * Calculates the spline parameters for the bezier spline type
+ */
+ void calculateBezier( const PMVector& p1, const PMVector& p2,
+ const PMVector& p3, const PMVector& p4 );
+ /**
+ * Calculates the spline parameters for the quadric bezier
+ */
+ void calculateQuadricBezier( const PMVector& p1, const PMVector& p2,
+ const PMVector& p3 );
+
+private:
+ double m_a[2], m_b[2], m_c[2], m_d[2];
+};
+
+typedef QValueList<PMSplineSegment> PMSegmentList;
+typedef QValueList<PMSegmentList> PMSegmentListList;
+
+#endif