--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Samples/WebAssembly/dev.h	Wed May 29 16:48:56 2019 +0200
@@ -0,0 +1,271 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2019 Osimis S.A., Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Affero General Public License
+ * as published by the Free Software Foundation, either version 3 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
+ * Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+#pragma once
+
+#include "../../Framework/OpenGL/WebAssemblyOpenGLContext.h"
+#include "../../Framework/Scene2D/OpenGLCompositor.h"
+#include "../../Framework/Scene2D/PanSceneTracker.h"
+#include "../../Framework/Scene2D/RotateSceneTracker.h"
+#include "../../Framework/Scene2D/ZoomSceneTracker.h"
+#include "../../Framework/Scene2DViewport/ViewportController.h"
+
+#include <Core/OrthancException.h>
+
+#include <emscripten/html5.h>
+
+static const unsigned int FONT_SIZE = 32;
+
+namespace OrthancStone
+{
+  class WebAssemblyViewport : public boost::noncopyable
+  {
+  private:
+    // the construction order is important because compositor_
+    // will hold a reference to the scene that belong to the 
+    // controller_ object
+    OpenGL::WebAssemblyOpenGLContext       context_;
+    boost::shared_ptr<ViewportController>  controller_;
+    OpenGLCompositor                       compositor_;
+
+    void SetupEvents(const std::string& canvas);
+
+  public:
+    WebAssemblyViewport(MessageBroker& broker,
+                        const std::string& canvas) :
+      context_(canvas),
+      controller_(new ViewportController(broker)),
+      compositor_(context_, *controller_->GetScene())
+    {
+      compositor_.SetFont(0, Orthanc::EmbeddedResources::UBUNTU_FONT, 
+                          FONT_SIZE, Orthanc::Encoding_Latin1);
+      SetupEvents(canvas);
+    }
+
+    Scene2D& GetScene()
+    {
+      return *controller_->GetScene();
+    }
+
+    const boost::shared_ptr<ViewportController>& GetController()
+    {
+      return controller_;
+    }
+
+    void UpdateSize()
+    {
+      context_.UpdateSize();
+      compositor_.UpdateSize();
+      Refresh();
+    }
+
+    void Refresh()
+    {
+      compositor_.Refresh();
+    }
+
+    void FitContent()
+    {
+      GetScene().FitContent(context_.GetCanvasWidth(), context_.GetCanvasHeight());
+    }
+
+    const std::string& GetCanvasIdentifier() const
+    {
+      return context_.GetCanvasIdentifier();
+    }
+
+    ScenePoint2D GetPixelCenterCoordinates(int x, int y) const
+    {
+      return compositor_.GetPixelCenterCoordinates(x, y);
+    }
+
+    unsigned int GetCanvasWidth() const
+    {
+      return context_.GetCanvasWidth();
+    }
+
+    unsigned int GetCanvasHeight() const
+    {
+      return context_.GetCanvasHeight();
+    }
+  };
+
+  class ActiveTracker : public boost::noncopyable
+  {
+  private:
+    boost::shared_ptr<IFlexiblePointerTracker> tracker_;
+    std::string                             canvasIdentifier_;
+    bool                                    insideCanvas_;
+    
+  public:
+    ActiveTracker(const boost::shared_ptr<IFlexiblePointerTracker>& tracker,
+                  const WebAssemblyViewport& viewport) :
+      tracker_(tracker),
+      canvasIdentifier_(viewport.GetCanvasIdentifier()),
+      insideCanvas_(true)
+    {
+      if (tracker_.get() == NULL)
+      {
+        throw Orthanc::OrthancException(Orthanc::ErrorCode_NullPointer);
+      }
+    }
+
+    bool IsAlive() const
+    {
+      return tracker_->IsAlive();
+    }
+
+    void PointerMove(const PointerEvent& event)
+    {
+      tracker_->PointerMove(event);
+    }
+
+    void PointerUp(const PointerEvent& event)
+    {
+      tracker_->PointerUp(event);
+    }
+  };
+}
+
+static OrthancStone::PointerEvent* ConvertMouseEvent(
+  const EmscriptenMouseEvent&        source,
+  OrthancStone::WebAssemblyViewport& viewport)
+{
+  std::auto_ptr<OrthancStone::PointerEvent> target(
+    new OrthancStone::PointerEvent);
+
+  target->AddPosition(viewport.GetPixelCenterCoordinates(
+    source.targetX, source.targetY));
+  target->SetAltModifier(source.altKey);
+  target->SetControlModifier(source.ctrlKey);
+  target->SetShiftModifier(source.shiftKey);
+
+  return target.release();
+}
+
+std::auto_ptr<OrthancStone::ActiveTracker> tracker_;
+
+EM_BOOL OnMouseEvent(int eventType, 
+                     const EmscriptenMouseEvent *mouseEvent, 
+                     void *userData)
+{
+  if (mouseEvent != NULL &&
+      userData != NULL)
+  {
+    OrthancStone::WebAssemblyViewport& viewport = 
+      *reinterpret_cast<OrthancStone::WebAssemblyViewport*>(userData);
+
+    switch (eventType)
+    {
+      case EMSCRIPTEN_EVENT_CLICK:
+      {
+        static unsigned int count = 0;
+        char buf[64];
+        sprintf(buf, "click %d", count++);
+
+        std::auto_ptr<OrthancStone::TextSceneLayer> layer(new OrthancStone::TextSceneLayer);
+        layer->SetText(buf);
+        viewport.GetScene().SetLayer(100, layer.release());
+        viewport.Refresh();
+        break;
+      }
+
+      case EMSCRIPTEN_EVENT_MOUSEDOWN:
+      {
+        boost::shared_ptr<OrthancStone::IFlexiblePointerTracker> t;
+
+        {
+          std::auto_ptr<OrthancStone::PointerEvent> event(
+            ConvertMouseEvent(*mouseEvent, viewport));
+
+          switch (mouseEvent->button)
+          {
+            case 0:  // Left button
+              emscripten_console_log("Creating RotateSceneTracker");
+              t.reset(new OrthancStone::RotateSceneTracker(
+                viewport.GetController(), *event));
+              break;
+
+            case 1:  // Middle button
+              emscripten_console_log("Creating PanSceneTracker");
+              LOG(INFO) << "Creating PanSceneTracker" ;
+              t.reset(new OrthancStone::PanSceneTracker(
+                viewport.GetController(), *event));
+              break;
+
+            case 2:  // Right button
+              emscripten_console_log("Creating ZoomSceneTracker");
+              t.reset(new OrthancStone::ZoomSceneTracker(
+                viewport.GetController(), *event, viewport.GetCanvasWidth()));
+              break;
+
+            default:
+              break;
+          }
+        }
+
+        if (t.get() != NULL)
+        {
+          tracker_.reset(
+            new OrthancStone::ActiveTracker(t, viewport));
+          viewport.Refresh();
+        }
+
+        break;
+      }
+
+      case EMSCRIPTEN_EVENT_MOUSEMOVE:
+        if (tracker_.get() != NULL)
+        {
+          std::auto_ptr<OrthancStone::PointerEvent> event(
+            ConvertMouseEvent(*mouseEvent, viewport));
+          tracker_->PointerMove(*event);
+          viewport.Refresh();
+        }
+        break;
+
+      case EMSCRIPTEN_EVENT_MOUSEUP:
+        if (tracker_.get() != NULL)
+        {
+          std::auto_ptr<OrthancStone::PointerEvent> event(
+            ConvertMouseEvent(*mouseEvent, viewport));
+          tracker_->PointerUp(*event);
+          viewport.Refresh();
+          if (!tracker_->IsAlive())
+            tracker_.reset();
+        }
+        break;
+
+      default:
+        break;
+    }
+  }
+
+  return true;
+}
+
+
+void OrthancStone::WebAssemblyViewport::SetupEvents(const std::string& canvas)
+{
+  emscripten_set_mousedown_callback(canvas.c_str(), this, false, OnMouseEvent);
+  emscripten_set_mousemove_callback(canvas.c_str(), this, false, OnMouseEvent);
+  emscripten_set_mouseup_callback(canvas.c_str(), this, false, OnMouseEvent);
+}