1 files changed, 62 insertions, 0 deletions
diff --git a/kig/objects/curve_imp.h b/kig/objects/curve_imp.h
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+// Copyright (C)  2002  Dominique Devriese <devriese@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.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+// 02110-1301, USA.
+
+#ifndef KIG_OBJECTS_CURVE_IMP_H
+#define KIG_OBJECTS_CURVE_IMP_H
+
+#include "object_imp.h"
+
+/**
+ * This class represents a curve: something which is composed of
+ * points, like a line, a circle, a locus...
+ */
+class CurveImp
+  : public ObjectImp
+{
+public:
+  typedef ObjectImp Parent;
+
+  /**
+   * Returns the ObjectImpType representing the CurveImp type.
+   */
+  static const ObjectImpType* stype();
+
+  Coordinate attachPoint() const;
+
+  // param is between 0 and 1.  Note that 0 and 1 should be the
+  // end-points.  E.g. for a Line, getPoint(0) returns a more or less
+  // infinite point.  getPoint(0.5) should return the point in the
+  // middle.
+  virtual double getParam( const Coordinate& point, const KigDocument& ) const = 0;
+  // this should be the inverse function of getPoint().
+  // Note that it should also do something reasonable when p is not on
+  // the curve.  You can return an invalid Coordinate(
+  // Coordinate::invalidCoord() ) if you need to in some cases.
+  virtual const Coordinate getPoint( double param, const KigDocument& ) const = 0;
+
+  virtual CurveImp* copy() const = 0;
+
+  /**
+   * Return whether this Curve contains the given point.  This is
+   * implemented as a numerical approximation.  Implementations
+   * can/should use the value test_threshold in common.h as a
+   * threshold value.
+   */
+  virtual bool containsPoint( const Coordinate& p, const KigDocument& ) const = 0;
+};
+
+#endif