# HG changeset patch
# User Sebastien Jodogne <s.jodogne@gmail.com>
# Date 1541069745 -3600
# Node ID a7de01c8fd29509cea9c59a3529d52419bb0dd12
# Parent  ef31240a73f6d799fa95e1a55ace3145c0a68e4a
new enum BitmapAnchor

diff -r ef31240a73f6 -r a7de01c8fd29 Applications/Samples/SimpleViewerApplicationSingleFile.h
--- a/Applications/Samples/SimpleViewerApplicationSingleFile.h	Wed Oct 31 18:10:29 2018 +0100
+++ b/Applications/Samples/SimpleViewerApplicationSingleFile.h	Thu Nov 01 11:55:45 2018 +0100
@@ -172,6 +172,14 @@
             widget.FitContent();
             break;
 
+          case 'l':
+            application_.currentTool_ = Tools_LineMeasure;
+            break;
+
+          case 'c':
+            application_.currentTool_ = Tools_CircleMeasure;
+            break;
+
           default:
             break;
           }
diff -r ef31240a73f6 -r a7de01c8fd29 Framework/Layers/CircleMeasureTracker.cpp
--- a/Framework/Layers/CircleMeasureTracker.cpp	Wed Oct 31 18:10:29 2018 +0100
+++ b/Framework/Layers/CircleMeasureTracker.cpp	Thu Nov 01 11:55:45 2018 +0100
@@ -71,8 +71,7 @@
     cairo_stroke(cr);
     cairo_restore(cr);
 
-    //context.SetSourceColor(0, 255, 0);
-    context.DrawText(font_, FormatRadius(), x, y);
+    context.DrawText(font_, FormatRadius(), x, y, BitmapAnchor_Center);
   }
     
 
diff -r ef31240a73f6 -r a7de01c8fd29 Framework/StoneEnumerations.cpp
--- a/Framework/StoneEnumerations.cpp	Wed Oct 31 18:10:29 2018 +0100
+++ b/Framework/StoneEnumerations.cpp	Thu Nov 01 11:55:45 2018 +0100
@@ -72,4 +72,66 @@
         throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
     }
   }
+
+  
+  void ComputeAnchorTranslation(double& deltaX,
+                                double& deltaY,
+                                BitmapAnchor anchor,
+                                unsigned int bitmapWidth,
+                                unsigned int bitmapHeight)
+  {
+    double dw = static_cast<double>(bitmapWidth);
+    double dh = static_cast<double>(bitmapHeight);
+
+    switch (anchor)
+    {
+      case BitmapAnchor_TopLeft:
+        deltaX = 0;
+        deltaY = 0;
+        break;
+        
+      case BitmapAnchor_TopCenter:
+        deltaX = -dw / 2.0;
+        deltaY = 0;
+        break;
+        
+      case BitmapAnchor_TopRight:
+        deltaX = -dw;
+        deltaY = 0;
+        break;
+        
+      case BitmapAnchor_CenterLeft:
+        deltaX = 0;
+        deltaY = -dh / 2.0;
+        break;
+        
+      case BitmapAnchor_Center:
+        deltaX = -dw / 2.0;
+        deltaY = -dh / 2.0;
+        break;
+        
+      case BitmapAnchor_CenterRight:
+        deltaX = -dw;
+        deltaY = -dh / 2.0;
+        break;
+        
+      case BitmapAnchor_BottomLeft:
+        deltaX = 0;
+        deltaY = -dh;
+        break;
+        
+      case BitmapAnchor_BottomCenter:
+        deltaX = -dw / 2.0;
+        deltaY = -dh;
+        break;
+        
+      case BitmapAnchor_BottomRight:
+        deltaX = -dw;
+        deltaY = -dh;
+        break;
+        
+      default:
+        throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
+    }    
+  }
 }
diff -r ef31240a73f6 -r a7de01c8fd29 Framework/StoneEnumerations.h
--- a/Framework/StoneEnumerations.h	Wed Oct 31 18:10:29 2018 +0100
+++ b/Framework/StoneEnumerations.h	Thu Nov 01 11:55:45 2018 +0100
@@ -102,6 +102,19 @@
     SopClassUid_RTDose
   };
 
+  enum BitmapAnchor
+  {
+    BitmapAnchor_BottomLeft,
+    BitmapAnchor_BottomCenter,
+    BitmapAnchor_BottomRight,
+    BitmapAnchor_CenterLeft,
+    BitmapAnchor_Center,
+    BitmapAnchor_CenterRight,
+    BitmapAnchor_TopLeft,
+    BitmapAnchor_TopCenter,
+    BitmapAnchor_TopRight
+  };
+
   bool StringToSopClassUid(SopClassUid& result,
                            const std::string& source);
 
@@ -110,4 +123,10 @@
                         ImageWindowing windowing,
                         float defaultCenter,
                         float defaultWidth);
+
+  void ComputeAnchorTranslation(double& deltaX /* out */,
+                                double& deltaY /* out */,
+                                BitmapAnchor anchor,
+                                unsigned int bitmapWidth,
+                                unsigned int bitmapHeight);
 }
diff -r ef31240a73f6 -r a7de01c8fd29 Framework/Viewport/CairoContext.cpp
--- a/Framework/Viewport/CairoContext.cpp	Wed Oct 31 18:10:29 2018 +0100
+++ b/Framework/Viewport/CairoContext.cpp	Thu Nov 01 11:55:45 2018 +0100
@@ -100,7 +100,7 @@
                             cairo_image_surface_get_data(surface_));
     }
 
-    void Fill(cairo_t* cr,
+    void Blit(cairo_t* cr,
               double x,
               double y)
     {
@@ -114,8 +114,10 @@
   void CairoContext::DrawText(const Orthanc::Font& font,
                               const std::string& text,
                               double x,
-                              double y)
+                              double y,
+                              BitmapAnchor anchor)
   {
+    // Render a bitmap containing the text
     unsigned int width, height;
     font.ComputeTextExtent(width, height, text);
     
@@ -125,6 +127,11 @@
     surface.GetAccessor(accessor);
     font.Draw(accessor, text, 0, 0, 255);
 
+    // Correct the text location given the anchor location
+    double deltaX, deltaY;
+    ComputeAnchorTranslation(deltaX, deltaY, anchor, width, height);
+
+    // Cancel zoom/rotation before blitting the text onto the surface
     double pixelX = x;
     double pixelY = y;
     cairo_user_to_device(context_, &pixelX, &pixelY);
@@ -132,8 +139,8 @@
     cairo_save(context_);
     cairo_identity_matrix(context_);
 
-    surface.Fill(context_, pixelX, pixelY);
-
+    // Blit the text bitmap
+    surface.Blit(context_, pixelX + deltaX, pixelY + deltaY);
     cairo_restore(context_);
   }
 }
diff -r ef31240a73f6 -r a7de01c8fd29 Framework/Viewport/CairoContext.h
--- a/Framework/Viewport/CairoContext.h	Wed Oct 31 18:10:29 2018 +0100
+++ b/Framework/Viewport/CairoContext.h	Thu Nov 01 11:55:45 2018 +0100
@@ -22,6 +22,7 @@
 #pragma once
 
 #include "CairoSurface.h"
+#include "../StoneEnumerations.h"
 
 #include <Core/Images/Font.h>
 
@@ -69,6 +70,7 @@
     void DrawText(const Orthanc::Font& font,
                   const std::string& text,
                   double x,
-                  double y);      
+                  double y,
+                  BitmapAnchor anchor);      
   };
 }