Dev中ChartControl——事件

1、CustomDrawAxisLabel ： 接管此事件来获得轴标签。定制轴标签

private void chartControl1_CustomDrawAxisLabel(object sender, CustomDrawAxisLabelEventArgs e)
{
    AxisBase axis = e.Item.Axis;
    if (axis is AxisY || axis is AxisY3D || axis is RadarAxisY)
    {
        double axisValue = (double)e.Item.AxisValue;
        if (axisValue < 0)
        {
            e.Item.TextColor = Color.Red;
        }
        else if (axisValue > 0)
        {
            e.Item.Text = "+" + e.Item.Text;
            e.Item.TextColor = Color.Green;
        }
        else if (axisValue == 0)
        {
            e.Item.Text = "Zero";
        }
    }
}

2、ObjectHotTracked：鼠标指针悬停位置

private void chartControl1_ObjectHotTracked(object sender, HotTrackEventArgs e)
{
    if (e.AdditionalObject is AxisTitle)
    {
        MessageBox.Show(e.AdditionalObject.GetType().ToString());
    }
}

3、CustomDrawSeries ：自定义绘制系列

private void chartControl1_CustomDrawSeries(object sender, CustomDrawSeriesEventArgs e)
{
    // Find all Bar Series by their view type,and fill them with Aqua color.
    if (e.Series.View is BarSeriesView)
        e.SeriesDrawOptions.Color = Color.Aqua;

    // Find the series by its name,  and change its line style to dash-dot-dot. (Here it's assumed that the series view type is LineSeriesView).
    if (e.Series.Name == "Line Series")
        ((LineDrawOptions)e.SeriesDrawOptions).LineStyle.DashStyle = DevExpress.XtraCharts.DashStyle.DashDotDot;

    // Find all Point Series by the type of its DrawOptions, and change their marker kind to diamond.
    if (e.SeriesDrawOptions.GetType() == typeof(PointDrawOptions))
        ((PointDrawOptions)e.SeriesDrawOptions).Marker.Kind =
        MarkerKind.Diamond;
}

4、CustomDrawSeriesPoint：自定义绘制系列点

private void chartControl1_CustomDrawSeriesPoint(object sender, CustomDrawSeriesPointEventArgs e)
{
    // These changes will be applied to Bar Series only.
    BarDrawOptions drawOptions = e.SeriesDrawOptions as BarDrawOptions;
    if (drawOptions == null)
        return;


    // Get the fill options for the series point.
    drawOptions.FillStyle.FillMode = DevExpress.XtraCharts.FillMode.Gradient;
    RectangleGradientFillOptions options =drawOptions.FillStyle.Options as RectangleGradientFillOptions;
    if (options == null)
        return;


    // Get the value at the current series point.
    double val = e.SeriesPoint[0];
    // If the value is less than 1, hide the point's label.
    if (e.SeriesPoint[0] < 1)
    {
        e.LabelText = "";
    }
    // If the value is less than 2.5, then fill the bar with green colors.
    if (val < 2.5)
    {
        options.Color2 = Color.FromArgb(154, 196, 84);
        drawOptions.Color = Color.FromArgb(81, 137, 3);
        drawOptions.Border.Color = Color.FromArgb(100, 39, 91, 1);
    }
    // ... if the value is less than 5.5, then fill the bar with yellow colors.
    else if (val < 5.5)
    {
        options.Color2 = Color.FromArgb(254, 233, 124);
        drawOptions.Color = Color.FromArgb(249, 170, 15);
        drawOptions.Border.Color = Color.FromArgb(60, 165, 73, 5);
    }
    // ... if the value is greater, then fill the bar with red colors.
    else
    {
        options.Color2 = Color.FromArgb(242, 143, 112);
        drawOptions.Color = Color.FromArgb(199, 57, 12);
        drawOptions.Border.Color = Color.FromArgb(100, 155, 26, 0);
    }
}