1 files changed, 172 insertions, 0 deletions
diff --git a/modules/render/render_osg_camera_manipulator.cpp b/modules/render/render_osg_camera_manipulator.cpp
new file mode 100644
index 0000000..3dca0f1
--- /dev/null
+++ b/modules/render/render_osg_camera_manipulator.cpp
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+/*
+ * render_osg_camera_manipulator.cpp - supports 3D interactive manipulators
+ *
+ *  Copyright (c) 2018 Intel Corporation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Author: Zong Wei <wei.zong@intel.com>
+ */
+
+#include "render_osg_camera_manipulator.h"
+
+namespace XCam {
+
+RenderOsgCameraManipulator::RenderOsgCameraManipulator ()
+    : osgGA::StandardManipulator::StandardManipulator ()
+    , mAngle (osg::PI)
+    , mLookAtOffset (0.0f)
+    , mMaxLookAtOffset (osg::PI_4)
+    , mLength (4.0f)
+    , mWidth (3.0f)
+    , mHeight (1.6f)
+    , mMaxHeight (4.0f)
+    , mMinHeight (0.6)
+    , mEyePosScale (1.0f)
+    , mUp (osg::Vec3d(0.0f, 0.0f, 1.0f))
+{
+    setAllowThrow (false);
+    setAutoComputeHomePosition (false);
+}
+
+RenderOsgCameraManipulator::~RenderOsgCameraManipulator ()
+{
+}
+
+osg::Matrixd
+RenderOsgCameraManipulator::getInverseMatrix () const
+{
+    osg::Vec3d eyePos;
+    getEyePosition (eyePos);
+    osg::Vec3d lookAtPos;
+    getLookAtPosition (lookAtPos);
+    return osg::Matrixd::lookAt (eyePos, lookAtPos, mUp);
+}
+
+osg::Matrixd
+RenderOsgCameraManipulator::getMatrix () const
+{
+    osg::Matrixd matrix = getInverseMatrix ();
+    return osg::Matrixd::inverse (matrix);
+}
+
+void
+RenderOsgCameraManipulator::home (double /*currentTime*/)
+{
+    mAngle = osg::PI;
+    mLookAtOffset = 0.0f;
+    mEyePosScale = 1.0f;
+}
+
+void
+RenderOsgCameraManipulator::rotate (float deltaAngle)
+{
+    if (deltaAngle > 0.) {
+        if (mLookAtOffset < mMaxLookAtOffset) {
+            mLookAtOffset = std::min (mLookAtOffset + deltaAngle, mMaxLookAtOffset);
+        } else {
+            mAngle += deltaAngle;
+        }
+    } else {
+        if (mLookAtOffset > -mMaxLookAtOffset) {
+            mLookAtOffset = std::max (mLookAtOffset + deltaAngle, -mMaxLookAtOffset);
+        } else {
+            mAngle += deltaAngle;
+        }
+    }
+    if (mAngle > 2 * osg::PI) {
+        mAngle -= 2 * osg::PI;
+    } else if (mAngle < 0.0f) {
+        mAngle += 2 * osg::PI;
+    }
+}
+
+void
+RenderOsgCameraManipulator::modifyHeight (float delta)
+{
+    if (delta > 0.0) {
+        mHeight = std::min (mHeight + delta, mMaxHeight);
+    } else {
+        mHeight = std::max (mHeight + delta, mMinHeight);
+    }
+}
+
+void
+RenderOsgCameraManipulator::getEyePosition (osg::Vec3d &eyePos) const
+{
+    float indentFactor = 1.0f - (0.1f * ((mHeight - mMinHeight) / (mMaxHeight - mMinHeight)));
+    eyePos[0] = cos (mAngle) * mLength * indentFactor;
+    eyePos[1] = sin (mAngle) * mWidth * indentFactor;
+    eyePos[2] = mHeight;
+    eyePos *= mEyePosScale;
+}
+
+void
+RenderOsgCameraManipulator::getLookAtPosition (osg::Vec3d &lookAtPos) const
+{
+    float lookAtAngle = mAngle + mLookAtOffset;
+    lookAtPos[0] = cos (lookAtAngle) * mLength * 0.5f;
+    lookAtPos[1] = sin (lookAtAngle) * mWidth * 0.5f;
+    lookAtPos[2] = mHeight * 0.25f;
+}
+
+bool
+RenderOsgCameraManipulator::handleKeyDown (const osgGA::GUIEventAdapter &ea, osgGA::GUIActionAdapter &us)
+{
+    (void)us;
+    bool eventHandled = false;
+    int key = ea.getKey ();
+    if (key == osgGA::GUIEventAdapter::KEY_Space) {
+        home (ea.getTime ());
+
+        eventHandled = true;
+    } else if (key == osgGA::GUIEventAdapter::KEY_Left) {
+        rotate (-0.1);
+        eventHandled = true;
+    } else if (key == osgGA::GUIEventAdapter::KEY_Right) {
+        rotate (0.1);
+        eventHandled = true;
+    }
+
+    return eventHandled;
+}
+
+bool
+RenderOsgCameraManipulator::handleMouseWheel (const osgGA::GUIEventAdapter &ea, osgGA::GUIActionAdapter &us)
+{
+    (void)us;
+    bool eventHandled = false;
+    osgGA::GUIEventAdapter::ScrollingMotion sm = ea.getScrollingMotion();
+
+    if (sm == osgGA::GUIEventAdapter::SCROLL_DOWN || sm == osgGA::GUIEventAdapter::SCROLL_RIGHT) {
+        rotate (0.1);
+        eventHandled = true;
+    } else if (osgGA::GUIEventAdapter::SCROLL_UP || sm == osgGA::GUIEventAdapter::SCROLL_LEFT) {
+        rotate (-0.1);
+        eventHandled = true;
+    }
+
+    return eventHandled;
+}
+
+bool
+RenderOsgCameraManipulator::performMovementLeftMouseButton (const double eventTimeDelta, const double dx, const double dy)
+{
+    (void)eventTimeDelta;
+
+    rotate (-2.0 * dx);
+    modifyHeight (-dy);
+    return true;
+}
+
+} // namespace XCam