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actions/rs_actiondrawlineorthtan.h

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+
+/****************************************************************************
+**
+ * This action class can handle user events to draw tangents normal to lines
+
+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_ACTIONDRAWLINEORTHTAN_H
+#define RS_ACTIONDRAWLINEORTHTAN_H
+
+#include "rs_previewactioninterface.h"
+
+class RS_Line;
+
+/**
+ * This action class can handle user events to draw tangents normal to lines
+ *
+ * @author Dongxu Li
+ */
+class RS_ActionDrawLineOrthTan : public RS_PreviewActionInterface {
+        Q_OBJECT
+private:
+    enum Status {
+        SetLine,     /**< Choose the line orthogonal to the tangent line */
+		SetCircle    /**< Choose the arc/circle/ellipse to create its tangent line*/
+    };
+
+public:
+    RS_ActionDrawLineOrthTan(RS_EntityContainer& container,
+                             RS_GraphicView& graphicView);
+
+	void trigger() override;
+	void finish(bool updateTB = true) override;
+
+	void mouseMoveEvent(QMouseEvent* e) override;
+	void mouseReleaseEvent(QMouseEvent* e) override;
+
+	void updateMouseButtonHints() override;
+	void updateMouseCursor() override;
+
+private:
+	void clearLines();
+    /** normal to tangent. */
+    RS_Line* normal; // the select normal line
+    /** tangent. */
+    RS_Line* tangent; //holds the tangent line for preview
+    /** arc/circle/ellipse to generate tangent */
+    RS_Entity* circle;
+};
+
+#endif