System.Windows.Forms.DataVisualization.Charting.Chart问题

Question

使用System.Windows.Forms.DataVisualization.Charting.Chart画个24小时的曲线图

比如画0-23小时的图,横坐标使用日期时间,纵坐标使用double值,如下:

 targetchart.ChartArea[0].AxisX.IntervalType = DateTimeIntervalType.Hours;
 targetchart.ChartArea[0].AxisX.Interval = 1;

在增加点的时候

for (int i = 0; i <= 23;i++ )
{
   targetchart.Series[0].Points.AddXY(DateTime.Parse("2013-5-8 0:00:00").AddHours(i), random.Next(5, 75));
}

在实际情况中,如果0点的值缺了,chart将不会画出这个点,直接从1点开始画,横标作也是从1点开始

现在的问题就是:如果0点的值缺了,我仍然需要画出0点的横坐标,也就是横坐标从0点开始,而实际的点从1点开始画,怎样实现?

Answer 1

能贴多些代码么?

这问题与您 ChartArea 的 index 和 for 里边的 int i 有关，

得添个 flag 才行

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Best regards

Answer 2

就一个ChartArea 和一个Series

//设置刻度
        public void InitChartAreaAxis(Chart targetChart)
        {
            ChartArea TempChartArea = targetChart.ChartAreas[0];
            // Enable X axis margin
            TempChartArea.AxisX.IsMarginVisible = false;

            TempChartArea.AxisX.IntervalType = DateTimeIntervalType.Hours;
            TempChartArea.AxisX.IsMarksNextToAxis = true;
            TempChartArea.AxisX.Interval = 4;
            TempChartArea.AxisX.IntervalOffsetType = DateTimeIntervalType.Hours;
            TempChartArea.AxisX.IntervalOffset = 2;
            TempChartArea.AxisX.IntervalAutoMode = IntervalAutoMode.FixedCount;
            //TempChartArea.AxisX.;
            TempChartArea.AxisX.LabelStyle.Font = new Font("微软雅黑", 18);
            TempChartArea.AxisX.LabelStyle.Format = "HH";

            TempChartArea.AxisX.LineWidth = 0;
            TempChartArea.AxisX.MajorGrid.LineWidth = 0;
            TempChartArea.AxisX.MajorGrid.Enabled = false;
            TempChartArea.AxisX.MajorTickMark.Enabled = false;
            TempChartArea.AxisX.MajorGrid.Interval = 4;
            TempChartArea.AxisX.MajorGrid.IntervalOffsetType = DateTimeIntervalType.Hours;
            TempChartArea.AxisX.MajorGrid.IntervalOffset = 2;

            TempChartArea.AxisX.IntervalOffset = 0;
            TempChartArea.AxisX.IntervalAutoMode = IntervalAutoMode.VariableCount;

            //TempChartArea.AxisX.Enabled =AxisEnabled.True;
           
            //Y轴 风速
            TempChartArea.AxisY.IsMarginVisible = false;
            //TempChartArea.AxisY.
            TempChartArea.AxisY.Title = "";
            TempChartArea.AxisY.TitleFont = new Font("微软雅黑", 18);
            TempChartArea.AxisY.LabelStyle.Font = new Font("微软雅黑", 16);
            TempChartArea.AxisY.LineWidth = 0;
            TempChartArea.AxisY.MajorGrid.LineWidth = 0;
            TempChartArea.AxisY.MajorGrid.Enabled = false;
            TempChartArea.AxisY.MajorTickMark.Enabled = false;
            TempChartArea.AxisY.Enabled = AxisEnabled.True;
        }

//设置系列
        public void InitChartSeries(Chart targetChart)
        {
            //设置系列 Series
            targetChart.Series.Clear();

            targetChart.Series.Add("Series1");

            foreach (Series TempSeries in targetChart.Series)
            {
                // Set series chart type
                TempSeries.ChartType = SeriesChartType.Line;
                TempSeries.BorderWidth = 8;
                TempSeries.ShadowColor = System.Drawing.Color.Black;
                TempSeries.ShadowOffset = 1;
                TempSeries.BorderColor = this.ChartColorsList[index].SeriesBorderColor;
                //系列上点的大小
                TempSeries.MarkerSize = 16;
                //系列上点的形状
                TempSeries.MarkerStyle = MarkerStyle.Circle;
                // Set point labels
                TempSeries.IsValueShownAsLabel = false;
                //系列的X值的类型
                TempSeries.XValueType = ChartValueType.DateTime;
                //系列的Y值的类型
                TempSeries.YValueType = ChartValueType.Double;
                //系列的刻度值
                TempSeries.Legend = targetChart.Legends[0].Name;
                //系列的图标区域
                TempSeries.ChartArea = targetChart.ChartAreas[0].Name;

                TempSeries.MarkerColor = Color.FromArgb(243,90,3);
                TempSeries.Color = Color.FromArgb(255,144,0);
            }
        }

//设置数据
        public void SetChartData( Chart targetChart, DataView view)
        {
            targetChart.Series[0].Points.Clear();
            for (int i = 0; i < view.Count; i = i + 2)
            {
                targetChart.Series[0].Points.AddXY(DateTime.Parse(view[i][1].ToString()), (float.Parse(view[i][2].ToString())).ToString("f1"));
            }
        }

现在的问题就是前面的问题了:就是DataView里面的数据都是有效的,但有缺测时次数据,如果缺测时次为第一个和最后一个,横坐标将从实际有的数据的横坐标开始显示,但我仍然希望横坐标从缺测时次开始显示,而实际显示曲线的时候从实际有数据的点开始画

麻烦你能写个简单的处理代码吗?

Answer 3

不知您合不合用：

//设置数据
public void SetChartData(Chart targetChart, DataView view)
{
    targetChart.Series[0].Points.Clear();

    DateTime startDateTime = DateTime.Parse(view[0][1].ToString());

    if (startDateTime.Hour != 0)
    {
        for (int i = startDateTime.Hour; i > 0; i--)
        {
            targetChart.Series[0].Points.AddXY(startDateTime.AddHours(-i), 0);
        }
    }

    for (int i = 0; i < view.Count; i++)
    {
        targetChart.Series[0].Points.AddXY(DateTime.Parse(view[i][1].ToString()), (float.Parse(view[i][2].ToString())).ToString("f1"));
    }
}

同时建议您做两个修正：

TempChartArea.AxisX.Interval = 1;
TempChartArea.AxisX.MajorGrid.Interval = 1;

效果会是这样：

---

Best regards

Answer 4

对不住，方才误解您了，

您试试这段吧：

//设置数据
public void SetChartData(Chart targetChart, DataView view)
{
    targetChart.Series[0].Points.Clear();

    object[][] completeHourData = new object[24][];

    for (int i = 0; i < view.Count; i++)
    {
        DateTime tempDateTime = DateTime.Parse(view[i][1].ToString());
        float tempSpeed = float.Parse(view[i][2].ToString());
        completeHourData[tempDateTime.Hour] = new object[] { tempDateTime, tempSpeed };
    }

    DateTime firstDateTime = (DateTime)completeHourData.First(x => x != null)[0];

    for (int i = 0; i < 24; i++)
    {
        if (completeHourData[i] == null)
        {
            targetChart.Series[0].Points.AddXY(firstDateTime.AddHours(i - firstDateTime.Hour), 0);
        }
        else
        {
            targetChart.Series[0].Points.AddXY(DateTime.Parse(completeHourData[i][0].ToString()), (float.Parse(completeHourData[i][1].ToString())).ToString("f1"));
        }
    }
}

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Best regards

Answer 5

如上图,我的意思是01-11,18-23之间的点我都不用画出来,直接画00点到12点,17点以后的点我也不用画出来,17点就是最后一个点,但我仍然需要01-11,18-23段的横坐标刻度和标签