--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Layers/CircleMeasureTracker.cpp	Fri Oct 14 15:34:11 2016 +0200
@@ -0,0 +1,122 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * In addition, as a special exception, the copyright holders of this
+ * program give permission to link the code of its release with the
+ * OpenSSL project's "OpenSSL" library (or with modified versions of it
+ * that use the same license as the "OpenSSL" library), and distribute
+ * the linked executables. You must obey the GNU General Public License
+ * in all respects for all of the code used other than "OpenSSL". If you
+ * modify file(s) with this exception, you may extend this exception to
+ * your version of the file(s), but you are not obligated to do so. If
+ * you do not wish to do so, delete this exception statement from your
+ * version. If you delete this exception statement from all source files
+ * in the program, then also delete it here.
+ * 
+ * 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+#define _USE_MATH_DEFINES  // To access M_PI in Visual Studio
+#include <cmath>
+
+#include "CircleMeasureTracker.h"
+
+#include "../Viewport/CairoFont.h"
+
+#include <stdio.h>
+
+namespace OrthancStone
+{
+  CircleMeasureTracker::CircleMeasureTracker(IStatusBar* statusBar,
+                                             const SliceGeometry& slice,
+                                             double x, 
+                                             double y,
+                                             uint8_t red,
+                                             uint8_t green,
+                                             uint8_t blue,
+                                             unsigned int fontSize) :
+    statusBar_(statusBar),
+    slice_(slice),
+    x1_(x),
+    y1_(y),
+    x2_(x),
+    y2_(y),
+    fontSize_(fontSize)
+  {
+    color_[0] = red;
+    color_[1] = green;
+    color_[2] = blue;
+  }
+    
+
+  void CircleMeasureTracker::Render(CairoContext& context,
+                                    double zoom)
+  {
+    double x = (x1_ + x2_) / 2.0;
+    double y = (y1_ + y2_) / 2.0;
+
+    Vector tmp;
+    GeometryToolbox::AssignVector(tmp, x2_ - x1_, y2_ - y1_);
+    double r = boost::numeric::ublas::norm_2(tmp) / 2.0;
+
+    context.SetSourceColor(color_[0], color_[1], color_[2]);
+
+    cairo_t* cr = context.GetObject();
+    cairo_save(cr);
+    cairo_set_line_width(cr, 2.0 / zoom);
+    cairo_translate(cr, x, y);
+    cairo_arc(cr, 0, 0, r, 0, 2 * M_PI);
+    cairo_stroke_preserve(cr);
+    cairo_stroke(cr);
+    cairo_restore(cr);
+
+    if (fontSize_ != 0)
+    {
+      cairo_move_to(cr, x, y);
+      CairoFont font("sans-serif", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
+      font.Draw(context, FormatRadius(), static_cast<double>(fontSize_) / zoom);
+    }
+  }
+    
+
+  double CircleMeasureTracker::GetRadius() const  // In millimeters
+  {
+    Vector a = slice_.MapSliceToWorldCoordinates(x1_, y1_);
+    Vector b = slice_.MapSliceToWorldCoordinates(x2_, y2_);
+    return boost::numeric::ublas::norm_2(b - a) / 2.0;
+  }
+
+
+  std::string CircleMeasureTracker::FormatRadius() const
+  {
+    char buf[64];
+    sprintf(buf, "%0.01f cm", GetRadius() / 10.0);
+    return buf;
+  }
+
+  void CircleMeasureTracker::MouseMove(double x,
+                                       double y)
+  {
+    x2_ = x;
+    y2_ = y;
+
+    if (statusBar_ != NULL)
+    {
+      statusBar_->SetMessage("Circle radius: " + FormatRadius());
+    }
+  }
+}