Wt

When I added or removed a series, the zoomRangeChanged didn't fire. It only fires when I zoom the chart.

The problem can be tested under ChartsExample.c

I added the code to subscribe zoom chart.

  chart->axis(Wt::Chart::Axis::Y).zoomRangeChanged().connect([](double min, double max) {
    Wt::log("deeebug") << "y-min:" << min;
    Wt::log("deeebug") << "y-max:" << max;
    });

Then I clicked at the table to add a series. The Y axis range changed but no feedback to zoomRangeChanged()

Note that the xaxis.maximum()/maximum() is not exactly equal to xaxis.zoomMinimum()/zoomMaximum(). I need precise displayed range info. I have to rely on zoomRangeChanged().

Here is my quick-and-dirty patch to overcome the issue

diff --git a/src/js/WCartesianChart.js b/src/js/WCartesianChart.js
index 20c23432..1a515d5d 100644
--- a/src/js/WCartesianChart.js
+++ b/src/js/WCartesianChart.js
@@ -414,6 +414,25 @@ WT_DECLARE_WT_MEMBER_BIG
         }
       }, TRANSFORM_CHANGED_TIMEOUT);
     }
+
+    function setTransformChangedWithoutOldCheck() {
+
+      if (!notifyAnyTransform())
+        return;
+
+      if (config.notifyTransform.x) {
+        APP.emit(target.widget, "xTransformChanged");
+        assign(oldXTransform, xTransform());
+      }
+      for (var i = 0; i < yAxisCount(); ++i) {
+        if (config.notifyTransform.y[i]) {
+          APP.emit(target.widget, "yTransformChanged" + i);
+          assign(oldYTransforms[i], yTransform(i));
+        }
+      }
+    }
+
+
     var tAssign = function(a, b) {
       assign(a,b);
       setTransformChangedTimeout();
@@ -1634,6 +1653,7 @@ WT_DECLARE_WT_MEMBER_BIG
       refreshPenColors();
       repaint();
       notifyAreaChanged();
+      setTransformChangedWithoutOldCheck();
     }

     this.updateConfig({});