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lib/information/rs_infoarea.h

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+/****************************************************************************
+**
+** This file is part of the LibreCAD project, a 2D CAD program
+**
+** Copyright (C) 2010 R. van Twisk (librecad@rvt.dds.nl)
+** Copyright (C) 2001-2003 RibbonSoft. All rights reserved.
+**
+**
+** This file may be distributed and/or modified under the terms of the
+** GNU General Public License version 2 as published by the Free Software
+** Foundation and appearing in the file gpl-2.0.txt included in the
+** packaging of this file.
+**
+** 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
+**
+** This copyright notice MUST APPEAR in all copies of the script!
+**
+**********************************************************************/
+
+#ifndef RS_INFOAREA_H
+#define RS_INFOAREA_H
+
+#include <vector>
+#include "rs_vector.h"
+
+class QPolygon;
+/**
+ * Class for getting information about an area.
+ *
+ * @author Andrew Mustun
+ */
+class RS_InfoArea {
+public:
+	RS_InfoArea();
+
+    void reset();
+    void push_back(const RS_Vector& p);
+    //whether the point p is already in contour
+    bool duplicated(const RS_Vector& p);
+    void pop_back();
+	double getArea() const;
+	double getCircumference();
+	int size();
+	const RS_Vector& at(int i) const;
+    /**
+     * @brief getArea of polygon
+     * @param polygon
+     * @return area
+     */
+    static double getArea(const QPolygon& polygon);
+
+private:
+    void calculate();
+    double calcSubArea(const RS_Vector& p1, const RS_Vector& p2);
+
+	std::vector<RS_Vector> thePoints;
+    double baseY;
+    double area;
+    double circumference;
+    bool calculationNeeded;
+};
+
+#endif