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actions/rs_actiondrawellipse4points.h

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+/****************************************************************************
+**
+ * Draw ellipse by foci and a point on ellipse
+
+Copyright (C) 2011 Dongxu Li (dongxuli2011@gmail.com)
+Copyright (C) 2011 R. van Twisk (librecad@rvt.dds.nl)
+
+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 RS_ACTIONDRAWELLIPSE4POINTS_H
+#define RS_ACTIONDRAWELLIPSE4POINTS_H
+
+#include "rs_previewactioninterface.h"
+
+struct RS_CircleData;
+struct RS_EllipseData;
+
+/**
+ * Draw ellipse in XY direction by 4 points on ellipse
+ *
+ * @author Dongxu Li
+ */
+class RS_ActionDrawEllipse4Points : public RS_PreviewActionInterface {
+        Q_OBJECT
+public:
+    /**
+     * Action States.
+     */
+    enum Status {
+        SetPoint1,   //  Setting the First Point.  */
+        SetPoint2,   //  Setting the Second Point.  */
+        SetPoint3,   //  Setting the Third Point.  */
+        SetPoint4   //  Setting the Last Point.  */
+    };
+
+public:
+    RS_ActionDrawEllipse4Points(RS_EntityContainer& container,
+                                RS_GraphicView& graphicView);
+	~RS_ActionDrawEllipse4Points() override;
+
+	void init(int status=0) override;
+
+	void trigger() override;
+	bool preparePreview();
+
+	void mouseMoveEvent(QMouseEvent* e) override;
+	void mouseReleaseEvent(QMouseEvent* e) override;
+
+	void coordinateEvent(RS_CoordinateEvent* e) override;
+	//    void commandEvent(RS_CommandEvent* e) override;
+	QStringList getAvailableCommands() override;
+
+	void updateMouseButtonHints() override;
+	void updateMouseCursor() override;
+
+protected:
+	// 4 points on ellipse
+	struct Points;
+	std::unique_ptr<Points> pPoints;
+};
+
+#endif