用 QML 自定义图表视图

注：这是QML 图表图库示例的一部分。

在此，我们将向您展示如何通过自定义饼系列来创建幸运轮。

首先，我们创建ChartView 和几个系列。

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
    }
}

应用程序数据在主矩形的 Component.onCompleted 中生成：

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;
}

以下自定义操作通过计时器反复进行。为了每次都能突出显示其中一个饼片，我们修改了它的 exploded 属性：

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

然后使用一个数据点的散点系列动画：

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

当幸运转盘停止时，我们通过修改颜色使活动切片闪烁。

// 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;

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