Several changes:

 - Added a feature example demonstrating WServer::postAll()
 - Fixed spelling error in locale example README
 - take into account the marker scale-factor for the tooltip area

Author: RockinRoel

examples/feature/CMakeLists.txt

@@ -11,6 +11,7 @@ SUBDIRS(
   oauth
   oidc
   paypal
+  postall
   scrollvisibility
   serverpush
   socketnotifier

examples/feature/postall/CMakeLists.txt

@@ -0,0 +1,2 @@
+WT_ADD_EXAMPLE(postall.wt postall.C)
+INCLUDE_DIRECTORIES(${WT_SOURCE_DIR}/src)

examples/feature/postall/README.md

@@ -0,0 +1,16 @@
+postAll feature example
+-----------------------
+
+This is an example that demonstrates how WServer::postAll can be used
+to send a message to all active sessions.
+
+How to run
+----------
+
+See the README in the parent directory.
+
+What it illustrates
+-------------------
+
+- How WServer::postAll() can be used to send messages to all sessions.
+- the user of the server push API

examples/feature/postall/postall.C

@@ -0,0 +1,56 @@
+#include <Wt/WApplication.h>
+#include <Wt/WBreak.h>
+#include <Wt/WContainerWidget.h>
+#include <Wt/WLineEdit.h>
+#include <Wt/WPushButton.h>
+#include <Wt/WServer.h>
+#include <Wt/WString.h>
+
+#include <cassert>
+
+class PostAllExample : public Wt::WApplication {
+public:
+  PostAllExample(const Wt::WEnvironment &env)
+    : WApplication{env}
+  {
+    // Enable server push
+    enableUpdates(true);
+
+    auto msgEdit = root()->addWidget(Wt::cpp14::make_unique<Wt::WLineEdit>());
+    auto sendBtn = root()->addWidget(
+          Wt::cpp14::make_unique<Wt::WPushButton>("Send message"));
+    root()->addWidget(Wt::cpp14::make_unique<Wt::WBreak>());
+    lastMsg_ = root()->addWidget(
+          Wt::cpp14::make_unique<Wt::WText>("No messages received yet."));
+
+    sendBtn->clicked().connect([msgEdit]{
+      auto server = Wt::WServer::instance();
+      Wt::WString msg = msgEdit->text();
+
+      // Send msg to all active sessions with WServer::postAll()
+      server->postAll([msg]{
+        auto app = dynamic_cast<PostAllExample*>(Wt::WApplication::instance());
+        assert(app != nullptr);
+        app->updateMsg(msg);
+
+        // Push the changes to the client
+        app->triggerUpdate();
+      });
+    });
+  }
+
+  void updateMsg(Wt::WString msg)
+  {
+    lastMsg_->setText(Wt::WString{"Last received message: {1}"}.arg(msg));
+  }
+
+private:
+  Wt::WText *lastMsg_;
+};
+
+int main(int argc, char *argv[])
+{
+  return Wt::WRun(argc, argv, [](const Wt::WEnvironment &env){
+    return Wt::cpp14::make_unique<PostAllExample>(env);
+  });
+}

src/Wt/Chart/WCartesianChart.C

@@ -1032,7 +1032,12 @@ public:
 
 	    std::unique_ptr<WCircleArea> circleArea(new WCircleArea());
 	    circleArea->setCenter(WPointF(p.x(), p.y()));
-	    circleArea->setRadius(5);
+	    const double *scaleFactorP = series.model()
+	      ->markerScaleFactor(yRow, yColumn);
+	    double scaleFactor = scaleFactorP != 0 ? *scaleFactorP : 1.0;
+	    if (scaleFactor < 1.0)
+	      scaleFactor = 1.0;
+	    circleArea->setRadius(int(scaleFactor * 5.0));
 	    circleArea->setToolTip(toolTip);
 
 	    const_cast<WCartesianChart&>(chart_)
@@ -1152,13 +1157,20 @@ public:
     if (matchedSeries_)
       return; // we already have a match
     if (!Utils::isNaN(x) && !Utils::isNaN(y)) {
+      const double *scaleFactorP = series.model()->markerScaleFactor(yRow, yColumn);
+      double scaleFactor = scaleFactorP != 0 ? *scaleFactorP : 1.0;
+      if (scaleFactor < 1.0)
+	scaleFactor = 1.0;
+      double scaledRx = scaleFactor * rX_;
+      double scaledRy = scaleFactor * rY_;
+      
       WPointF p = chart_.map(x, y, series.axis(), currentXSegment(), currentYSegment());
       double dx = p.x() - matchX_;
       double dy = p.y() - matchY_;
       double dx2 = dx * dx;
       double dy2 = dy * dy;
-      double rx2 = rX_ * rX_;
-      double ry2 = rY_ * rY_;
+      double rx2 = scaledRx * scaledRx;
+      double ry2 = scaledRy * scaledRy;
       if (dx2/rx2 + dy2/ry2 <= 1) {
 	matchedXRow_ = xRow;
 	matchedXColumn_ = xColumn;