--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Samples/WebAssembly/BasicScene.cpp	Thu May 02 13:27:41 2019 +0200
@@ -0,0 +1,253 @@
+/**
+ * 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/>.
+ **/
+
+
+
+#include <emscripten.h>
+#include <emscripten/html5.h>
+
+// From Stone
+#include "../../Applications/Sdl/SdlOpenGLWindow.h"
+#include "../../Framework/Scene2D/CairoCompositor.h"
+#include "../../Framework/Scene2D/ColorTextureSceneLayer.h"
+#include "../../Framework/Scene2D/OpenGLCompositor.h"
+#include "../../Framework/Scene2D/PanSceneTracker.h"
+#include "../../Framework/Scene2D/RotateSceneTracker.h"
+#include "../../Framework/Scene2D/Scene2D.h"
+#include "../../Framework/Scene2D/ZoomSceneTracker.h"
+#include "../../Framework/StoneInitialization.h"
+#include "../../Framework/OpenGL/WebAssemblyOpenGLContext.h"
+
+// From Orthanc framework
+#include <Core/Images/Image.h>
+
+#include <stdio.h>
+
+static const unsigned int FONT_SIZE = 32;
+
+
+void PrepareScene(OrthancStone::Scene2D& scene)
+{
+  using namespace OrthancStone;
+
+  // Texture of 2x2 size
+  if (1)
+  {
+    Orthanc::Image i(Orthanc::PixelFormat_RGB24, 2, 2, false);
+    
+    uint8_t *p = reinterpret_cast<uint8_t*>(i.GetRow(0));
+    p[0] = 255;
+    p[1] = 0;
+    p[2] = 0;
+
+    p[3] = 0;
+    p[4] = 255;
+    p[5] = 0;
+
+    p = reinterpret_cast<uint8_t*>(i.GetRow(1));
+    p[0] = 0;
+    p[1] = 0;
+    p[2] = 255;
+
+    p[3] = 255;
+    p[4] = 0;
+    p[5] = 0;
+
+    scene.SetLayer(12, new ColorTextureSceneLayer(i));
+
+    std::auto_ptr<ColorTextureSceneLayer> l(new ColorTextureSceneLayer(i));
+    l->SetOrigin(-3, 2);
+    l->SetPixelSpacing(1.5, 1);
+    l->SetAngle(20.0 / 180.0 * M_PI);
+    scene.SetLayer(14, l.release());
+  }
+
+  // Texture of 1x1 size
+  if (1)
+  {
+    Orthanc::Image i(Orthanc::PixelFormat_RGB24, 1, 1, false);
+    
+    uint8_t *p = reinterpret_cast<uint8_t*>(i.GetRow(0));
+    p[0] = 255;
+    p[1] = 0;
+    p[2] = 0;
+
+    std::auto_ptr<ColorTextureSceneLayer> l(new ColorTextureSceneLayer(i));
+    l->SetOrigin(-2, 1);
+    l->SetAngle(20.0 / 180.0 * M_PI);
+    scene.SetLayer(13, l.release());
+  }
+
+  // Some lines
+  {
+    std::auto_ptr<PolylineSceneLayer> layer(new PolylineSceneLayer);
+
+    layer->SetThickness(1);
+
+    PolylineSceneLayer::Chain chain;
+    chain.push_back(ScenePoint2D(0 - 0.5, 0 - 0.5));
+    chain.push_back(ScenePoint2D(0 - 0.5, 2 - 0.5));
+    chain.push_back(ScenePoint2D(2 - 0.5, 2 - 0.5));
+    chain.push_back(ScenePoint2D(2 - 0.5, 0 - 0.5));
+    layer->AddChain(chain, true);
+
+    chain.clear();
+    chain.push_back(ScenePoint2D(-5, -5));
+    chain.push_back(ScenePoint2D(5, -5));
+    chain.push_back(ScenePoint2D(5, 5));
+    chain.push_back(ScenePoint2D(-5, 5));
+    layer->AddChain(chain, true);
+
+    double dy = 1.01;
+    chain.clear();
+    chain.push_back(ScenePoint2D(-4, -4));
+    chain.push_back(ScenePoint2D(4, -4 + dy));
+    chain.push_back(ScenePoint2D(-4, -4 + 2.0 * dy));
+    chain.push_back(ScenePoint2D(4, 2));
+    layer->AddChain(chain, false);
+
+    layer->SetColor(0,255, 255);
+    scene.SetLayer(50, layer.release());
+  }
+
+  // Some text
+  if (1)
+  {
+    std::auto_ptr<TextSceneLayer> layer(new TextSceneLayer);
+    layer->SetText("Hello");
+    scene.SetLayer(100, layer.release());
+  }
+}
+
+
+
+
+
+class WebAssemblyCanvas : public boost::noncopyable
+{
+private:
+  OrthancStone::OpenGL::WebAssemblyOpenGLContext  context_;
+  OrthancStone::Scene2D                           scene_;
+  OrthancStone::OpenGLCompositor                  compositor_;
+
+public:
+  WebAssemblyCanvas(const std::string& canvas) :
+    context_(canvas),
+    compositor_(context_, scene_)
+  {
+    compositor_.SetFont(0, Orthanc::EmbeddedResources::UBUNTU_FONT, 
+                        FONT_SIZE, Orthanc::Encoding_Latin1);
+  }
+
+  OrthancStone::Scene2D& GetScene()
+  {
+    return scene_;
+  }
+
+  void UpdateSize()
+  {
+    context_.UpdateSize();
+    compositor_.UpdateSize();
+    Refresh();
+  }
+
+  void Refresh()
+  {
+    compositor_.Refresh();
+  }
+};
+
+
+
+std::auto_ptr<WebAssemblyCanvas>  canvas1_;
+std::auto_ptr<WebAssemblyCanvas>  canvas2_;
+std::auto_ptr<WebAssemblyCanvas>  canvas3_;
+
+
+EM_BOOL OnWindowResize(int eventType, const EmscriptenUiEvent *uiEvent, void *userData)
+{
+  if (canvas1_.get() != NULL)
+  {
+    canvas1_->UpdateSize();
+  }
+  
+  if (canvas2_.get() != NULL)
+  {
+    canvas2_->UpdateSize();
+  }
+  
+  if (canvas3_.get() != NULL)
+  {
+    canvas3_->UpdateSize();
+  }
+  
+  return true;
+}
+
+
+EM_BOOL OnMouseClick(int eventType, const EmscriptenMouseEvent *mouseEvent, void *userData)
+{
+  if (userData != NULL)
+  {
+    WebAssemblyCanvas& canvas = *reinterpret_cast<WebAssemblyCanvas*>(userData);
+
+    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);
+    canvas.GetScene().SetLayer(100, layer.release());
+    canvas.Refresh();
+  }
+
+  return true;
+}
+
+
+extern "C"
+{
+  int main(int argc, char const *argv[]) 
+  {
+    OrthancStone::StoneInitialize();
+    EM_ASM(window.dispatchEvent(new CustomEvent("WebAssemblyLoaded")););
+  }
+
+  EMSCRIPTEN_KEEPALIVE
+  void Initialize()
+  {
+    canvas1_.reset(new WebAssemblyCanvas("mycanvas1"));
+    PrepareScene(canvas1_->GetScene());
+    canvas1_->UpdateSize();
+
+    canvas2_.reset(new WebAssemblyCanvas("mycanvas2"));
+    PrepareScene(canvas2_->GetScene());
+    canvas2_->UpdateSize();
+
+    canvas3_.reset(new WebAssemblyCanvas("mycanvas3"));
+    PrepareScene(canvas3_->GetScene());
+    canvas3_->UpdateSize();
+
+    emscripten_set_resize_callback("#window", NULL, false, OnWindowResize);
+    emscripten_set_click_callback("mycanvas1", canvas1_.get(), false, OnMouseClick);
+    emscripten_set_click_callback("mycanvas2", canvas2_.get(), false, OnMouseClick);
+    emscripten_set_click_callback("mycanvas3", canvas3_.get(), false, OnMouseClick);
+  }
+}