Added panning and zooming functionality to transfer function UI prototype code.

2013-11-18 12:46:00 +00:00
parent 80c45ad46a
commit d7442e7456
6 changed files with 859 additions and 105 deletions
--- a/examples/osgtransferfunction/TransferFunctionWidget.h
+++ b/examples/osgtransferfunction/TransferFunctionWidget.h
@@ -0,0 +1,73 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2013 Robert Osfield
+ *
+ * This library is open source and may be redistributed and/or modified under
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ *
+ * This library 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
+ * OpenSceneGraph Public License for more details.
+*/
+
+#ifndef OSGUI_TRANSFERFUNCTIONWIDGET
+#define OSGUI_TRANSFERFUNCTIONWIDGET
+
+#include <osg/Group>
+#include <osg/TransferFunction>
+
+#include "Widget.h"
+
+#define OSGUI_EXPORT
+
+namespace osgUI
+{
+
+class OSGUI_EXPORT TransferFunctionWidget : public osgUI::Widget
+{
+public:
+    TransferFunctionWidget(osg::TransferFunction1D* tf=0);
+    TransferFunctionWidget(const TransferFunctionWidget& tfw, const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY);
+    META_Node(osgUI, TransferFunctionWidget);
+
+    void traverse(osg::NodeVisitor& nv);
+
+    virtual bool handle(osgGA::EventVisitor* ev, osgGA::Event* event);
+
+    void setTransferFunction(const osg::TransferFunction1D* tf);
+    osg::TransferFunction1D* getTransferFunction() { return _transferFunction.get(); }
+    const osg::TransferFunction1D* getTransferFunction() const { return _transferFunction.get(); }
+
+    void resetVisibleRange();
+    void setVisibleRange(float left, float right);
+    void translateVisibleRange(float delta);
+    void scaleVisibleRange(float center, float delta);
+
+    virtual void createGraphics();
+
+protected:
+    virtual ~TransferFunctionWidget() {}
+
+    osg::ref_ptr<osg::TransferFunction1D> _transferFunction;
+
+    osg::ref_ptr<osg::Geode>            _geode;
+    osg::ref_ptr<osg::Geometry>         _geometry;
+    osg::ref_ptr<osg::Vec3Array>        _vertices;
+    osg::ref_ptr<osg::Vec4Array>        _colours;
+    osg::ref_ptr<osg::DrawElementsUShort> _background_primitives;
+    osg::ref_ptr<osg::DrawElementsUShort> _historgram_primitives;
+    osg::ref_ptr<osg::DrawElementsUShort> _outline_primitives;
+
+    float       _min;
+    float       _max;
+    float       _left;
+    float       _right;
+
+    bool        _startedDrag;
+    float       _previousDragPosition;
+};
+
+}
+
+#endif