- Qt 6.8
- Qt Charts
- Customizing Chart Views with QML
- Qt Charts | Commercial or GPLv3

# Customizing Chart Views with QML

Note: This is part of the Charts with QML Gallery example.

Here we show you how to create a wheel of fortune by customizing a pie series.

First we create the ChartView and a couple of series.

     ChartView {
         id: chartView
         anchors.fill: parent
         title: "Wheel of Fortune"
         legend.visible: false
         antialiasing: true

         PieSeries {
             id: wheelOfFortune
             horizontalPosition: 0.3
         }

         SplineSeries {
             id: splineSeries
         }

         ScatterSeries {
             id: scatterSeries
         }
     }

The application data is generated in Component.onCompleted of the main rectangle:

     Component.onCompleted: {
         __intervalCoefficient = Math.random() + 0.25;

         for (var i = 0; i < 20; i++)
             wheelOfFortune.append("", 1);

         var interval = 1;
         for (var j = 0; interval < 800; j++) {
             interval = __intervalCoefficient * j * j;
             splineSeries.append(j, interval);
         }
         chartView.axisX(scatterSeries).max = j;
         chartView.axisY(scatterSeries).max = 1000;
     }

The following customizations are done repeatedly with a timer. To highlight one of the pie slices at time we modify its exploded property:

     wheelOfFortune.at(index).exploded = false;
     root.__activeIndex++;
     index = root.__activeIndex % wheelOfFortune.count;
     wheelOfFortune.at(index).exploded = true;

Then an animation using a scatter series with one data point:

     scatterSeries.clear();
     scatterSeries.append(root.__activeIndex, interval);
     scatterSeries.color = Qt.tint(scatterSeries.color, "#05FF0000");
     scatterSeries.markerSize += 0.5;

When the wheel of fortune has stopped, we make the active slice blink by modifying its colors.

     // Switch the colors of the slice and the border
     wheelOfFortune.at(index).borderWidth = 2;
     switchColor = wheelOfFortune.at(index).borderColor;
     wheelOfFortune.at(index).borderColor = wheelOfFortune.at(index).color;
     wheelOfFortune.at(index).color = switchColor;