From 8081c067a611b147b9bde00ce1b7aec92fabaa69 Mon Sep 17 00:00:00 2001
From: Marc Zinnschlag <marc@zpages.de>
Date: Tue, 25 Feb 2014 13:09:37 +0100
Subject: [PATCH] moving the camera with W and S keys

---
 apps/opencs/view/render/scenewidget.cpp | 61 +++++++++++++++++++++++--
 apps/opencs/view/render/scenewidget.hpp | 14 +++++-
 2 files changed, 71 insertions(+), 4 deletions(-)

diff --git a/apps/opencs/view/render/scenewidget.cpp b/apps/opencs/view/render/scenewidget.cpp
index 88493fd76..280a85fd4 100644
--- a/apps/opencs/view/render/scenewidget.cpp
+++ b/apps/opencs/view/render/scenewidget.cpp
@@ -2,6 +2,7 @@
 
 #include <QEvent>
 #include <QResizeEvent>
+#include <QTimer>
 
 #include <OgreRoot.h>
 #include <OgreRenderWindow.h>
@@ -10,16 +11,18 @@
 
 namespace CSVRender
 {
-
     SceneWidget::SceneWidget(QWidget *parent)
         : QWidget(parent)
         , mWindow(NULL)
         , mCamera(NULL)
-        , mSceneMgr(NULL), mNavigationMode (NavigationMode_Free)
+        , mSceneMgr(NULL), mNavigationMode (NavigationMode_Free), mUpdate (false)
+        , mKeyForward (false), mKeyBackward (false)
     {
         setAttribute(Qt::WA_PaintOnScreen);
         setAttribute(Qt::WA_NoSystemBackground);
 
+        setFocusPolicy (Qt::StrongFocus);
+
         mSceneMgr = Ogre::Root::getSingleton().createSceneManager(Ogre::ST_GENERIC);
 
         // Throw in a random color just to make sure multiple scenes work
@@ -44,6 +47,11 @@ namespace CSVRender
         mCamera->lookAt(0,0,0);
         mCamera->setNearClipDistance(0.1);
         mCamera->setFarClipDistance(3000);
+
+        QTimer *timer = new QTimer (this);
+
+        connect (timer, SIGNAL (timeout()), this, SLOT (update()));
+        timer->start (20); /// \todo make this configurable
     }
 
     void SceneWidget::updateOgreWindow()
@@ -93,7 +101,6 @@ namespace CSVRender
         e->accept();
     }
 
-
     QPaintEngine* SceneWidget::paintEngine() const
     {
         // We don't want another paint engine to get in the way.
@@ -130,4 +137,52 @@ namespace CSVRender
         return QWidget::event(e);
     }
 
+    void SceneWidget::keyPressEvent (QKeyEvent *event)
+    {
+        switch (event->key())
+        {
+            case Qt::Key_W: mKeyForward = true; break;
+            case Qt::Key_S: mKeyBackward = true; break;
+            default: QWidget::keyPressEvent (event);
+        }
+    }
+
+    void SceneWidget::keyReleaseEvent (QKeyEvent *event)
+    {
+        switch (event->key())
+        {
+            case Qt::Key_W: mKeyForward = false; break;
+            case Qt::Key_S: mKeyBackward = false; break;
+            default: QWidget::keyReleaseEvent (event);
+        }
+    }
+
+    void SceneWidget::focusOutEvent (QFocusEvent *event)
+    {
+        mKeyForward = false;
+        mKeyBackward = false;
+
+        QWidget::focusOutEvent (event);
+    }
+
+    void SceneWidget::update()
+    {
+        if (mKeyForward && !mKeyBackward)
+        {
+            mCamera->move (mCamera->getDirection());
+            mUpdate = true;
+        }
+
+        if (!mKeyForward && mKeyBackward)
+        {
+            mCamera->move (-mCamera->getDirection());
+            mUpdate = true;
+        }
+
+        if (mUpdate)
+        {
+            mUpdate = false;
+            mWindow->update();
+        }
+    }
 }
diff --git a/apps/opencs/view/render/scenewidget.hpp b/apps/opencs/view/render/scenewidget.hpp
index deba47fbb..777398353 100644
--- a/apps/opencs/view/render/scenewidget.hpp
+++ b/apps/opencs/view/render/scenewidget.hpp
@@ -12,7 +12,6 @@ namespace Ogre
 
 namespace CSVRender
 {
-
     class SceneWidget : public QWidget
     {
         Q_OBJECT
@@ -34,6 +33,12 @@ namespace CSVRender
             void resizeEvent(QResizeEvent* e);
             bool event(QEvent* e);
 
+            void keyPressEvent (QKeyEvent *event);
+
+            void keyReleaseEvent (QKeyEvent *event);
+
+            void focusOutEvent (QFocusEvent *event);
+
             void updateOgreWindow();
 
             Ogre::Camera*	    mCamera;
@@ -41,6 +46,13 @@ namespace CSVRender
             Ogre::RenderWindow* mWindow;
 
             NavigationMode mNavigationMode;
+            bool mUpdate;
+            int mKeyForward;
+            int mKeyBackward;
+
+        private slots:
+
+            void update();
     };
 }