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actions/rs_actiondrawlinetangent1.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_ACTIONDRAWLINETANGENT1_H
+#define RS_ACTIONDRAWLINETANGENT1_H
+
+#include "rs_previewactioninterface.h"
+
+class RS_Line;
+/**
+ * This action class can handle user events to draw tangents from points
+ * to circles.
+ *
+ * @author Andrew Mustun
+ */
+class RS_ActionDrawLineTangent1 : public RS_PreviewActionInterface {
+	Q_OBJECT
+private:
+    enum Status {
+        SetPoint,     /**< Choose the startpoint. */
+        SetCircle      /**< Choose the circle / arc. */
+    };
+
+public:
+    RS_ActionDrawLineTangent1(RS_EntityContainer& container,
+                              RS_GraphicView& graphicView);
+	~RS_ActionDrawLineTangent1() override;
+
+	void trigger() override;
+	
+	void mouseMoveEvent(QMouseEvent* e) override;
+	void mouseReleaseEvent(QMouseEvent* e) override;
+	
+	void coordinateEvent(RS_CoordinateEvent* e) override;
+	
+	void updateMouseButtonHints() override;
+	void updateMouseCursor() override;
+
+private:
+    /** Closest tangent. */
+	std::unique_ptr<RS_Line> tangent;
+    /** Chosen startpoint */
+	std::unique_ptr<RS_Vector> point;
+    /** Chosen entity */
+    RS_Entity* circle;
+
+    //list of entity types supported by current action
+    const EntityTypeList circleType = EntityTypeList{ RS2::EntityArc,
+                RS2::EntityCircle,
+                RS2::EntityEllipse,
+                RS2::EntitySplinePoints };
+};
+
+#endif