Chart Legend: Checkboxes not Clickable

[buchi]

Hi

Toggling the visibility of certain series by using the corresponding checkboxes of the legend seems to fail under some special circumstances.

Imagine a series gets (invisibly) painted even beyond the chart axes. If such a line crosses the location of a checkbox, this checkbox is no longer clickable. Please take a look at the beautiful "TeePaperChart" attached to this post for further clarification.

Unfortunately we stick at version 2.0.2987.19069 as our reporting component has some issues with nested controls and just does not display the charts when using newer TeeCharts versions.

May I ask you for your assistance to find a workarround to get those checkboxes working under all circumstances? We would higly apprechiate your help.

Thank you very much

Manuel

[Yeray]

Hi Manuel,

I've tried to reproduce the problem with the following code but I can't.
Note that I'm drawing a line at AfterDraw event over the series line to see if the hidden part of the series passes for the legend checkbox.

Code: Select all

public Form1()
        {
            InitializeComponent();

            CreateChart();
            InitializeChart();
        }

        private Steema.TeeChart.TChart tChart1;
        private void CreateChart()
        {
            this.Width = 900;
            this.Height = 600;

            Steema.TeeChart.Commander chartController1 = new Steema.TeeChart.Commander();
            chartController1.Dock = DockStyle.Top;

            tChart1 = new Steema.TeeChart.TChart();
            tChart1.Dock = DockStyle.Fill;

            chartController1.Chart = tChart1;

            this.Controls.Add(tChart1);
            this.Controls.Add(chartController1);
        }


        private Steema.TeeChart.Styles.Line series;
        private void InitializeChart()
        {
            tChart1.Aspect.View3D = false;

            new Steema.TeeChart.Styles.Line(tChart1.Chart);
            new Steema.TeeChart.Styles.Line(tChart1.Chart);

            series = new Steema.TeeChart.Styles.Line(tChart1.Chart);
            series.LinePen.Width = 3;
            series.Add(10);
            series.Add(0);
            series.Add(10);
            series.Add(0);

            tChart1.Axes.Bottom.SetMinMax(0, 3);
            tChart1.Axes.Left.SetMinMax(1.5, 10);

            tChart1.Panel.MarginBottom = 7;
            tChart1.Legend.CheckBoxes = true;
            tChart1.Legend.Alignment = Steema.TeeChart.LegendAlignments.Bottom;
            tChart1.Legend.CustomPosition = true;
            tChart1.Legend.Left = 330;
            tChart1.Legend.Top = 510;

            tChart1.AfterDraw += new Steema.TeeChart.PaintChartEventHandler(tChart1_AfterDraw);
        }

        void tChart1_AfterDraw(object sender, Steema.TeeChart.Drawing.Graphics3D g)
        {
            if (tChart1[1].Active)
            {
                g.Pen.Width = 1;
                g.Pen.Color = Color.Black;
                g.Line(series.CalcXPos(0), series.CalcYPos(0), series.CalcXPos(1), series.CalcYPos(1));
                g.Line(series.CalcXPos(1), series.CalcYPos(1), series.CalcXPos(2), series.CalcYPos(2));
            }
        }

I couldn't reproduce it either in TeeChart v4 nor v2.

[buchi]

Hi Yeray
Thank you for your message. Please find attached a small sample project which easily shows the issue described in my first post.
Best regards,
Manuel

[buchi]

Hi Yeray

I am quite surprised that your example is working. I looked at the differences and figured out that two additional conditions must be met:

• There must be a handler for the ClickSeries event of the chart
• Legend.CustomPosition must be false

Please find the modified code below.

Best regards,
Manuel

Code: Select all

        public Form2()
        {
            InitializeComponent();

            CreateChart();
            InitializeChart();
        }

        private Steema.TeeChart.TChart tChart1;
        private void CreateChart()
        {
            this.Width = 900;
            this.Height = 600;

            Steema.TeeChart.Commander chartController1 = new Steema.TeeChart.Commander();
            chartController1.Dock = DockStyle.Top;

            tChart1 = new Steema.TeeChart.TChart();
            tChart1.Dock = DockStyle.Fill;

            chartController1.Chart = tChart1;

            this.Controls.Add(tChart1);
            this.Controls.Add(chartController1);
        }


        private Steema.TeeChart.Styles.Line series;
        private void InitializeChart()
        {
            tChart1.Aspect.View3D = false;

            new Steema.TeeChart.Styles.Line(tChart1.Chart);
            new Steema.TeeChart.Styles.Line(tChart1.Chart);

            series = new Steema.TeeChart.Styles.Line(tChart1.Chart);
            series.LinePen.Width = 3;
            series.Add(10);
            series.Add(0);
            series.Add(10);
            series.Add(0);

            tChart1.Axes.Bottom.SetMinMax(0, 3);
            tChart1.Axes.Left.SetMinMax(1.5, 10);

            tChart1.Panel.MarginBottom = 7;
            tChart1.Legend.CheckBoxes = true;
            tChart1.Legend.Alignment = Steema.TeeChart.LegendAlignments.Bottom;
            //tChart1.Legend.CustomPosition = true;
            //tChart1.Legend.Left = 330;
            //tChart1.Legend.Top = 510;

            tChart1.AfterDraw += new Steema.TeeChart.PaintChartEventHandler(tChart1_AfterDraw);

            tChart1.ClickSeries += new Steema.TeeChart.TChart.SeriesEventHandler(tChart1_ClickSeries);
        }

        void tChart1_ClickSeries(object sender, Steema.TeeChart.Styles.Series s, int valueIndex, MouseEventArgs e)
        {
            Console.WriteLine("Series clicked");
        }

        void tChart1_AfterDraw(object sender, Steema.TeeChart.Drawing.Graphics3D g)
        {
            if (tChart1[1].Active)
            {
                g.Pen.Width = 1;
                g.Pen.Color = Color.Black;
                g.Line(series.CalcXPos(0), series.CalcYPos(0), series.CalcXPos(1), series.CalcYPos(1));
                g.Line(series.CalcXPos(1), series.CalcYPos(1), series.CalcXPos(2), series.CalcYPos(2));
            }
        }

[Sandra]

Hello Manuel,

I have checked yeray's code again, and work well using either version 4 or version 2. Can you please explain us because previous code doesn't work fine for you? Because we can so we try to find a solution for your problem.


Thanks,

[buchi]

Hi Sandra

Yeray's code is working fine. The problem is that we do not want to position the legend manually and that we need the series click event. As soon as you change those two things in Yeray's code it will expose the same issue as my code currently has. Please try out either the modified version of Yeray's code or the sample project I have provided earlier.

Thank you

Best regards,
Manuel

[Yeray]

Hi Manuel,

I could reproduce the problem now. It seems that the ClickSeries event may conflict with the legend checkboxes in the situation you described (the part of the series out of the chart rect would be over the legend). I've added it to the defect list to be fixed in future releases (TF02015147).

In the meanwhile you could try using MouseMove event in combination with series' click method instead of the ClickSeries event.

[buchi]

Hi Yeray

Unfortunately, the series click event causes the same problem.
Based on the chart's MouseClick event and the Clicked method of the series it seems possible to implement a workarround:

Code: Select all

        void tChart1_MouseClick(object sender, MouseEventArgs e)
        {
            Rectangle chartR = tChart1.Chart.ChartRect;
            if (chartR.Contains(e.Location))
            {
                for (int i = tChart1.Series.Count - 1; i >= 0 ; i--)
                {
                    if (tChart1[i].Visible && tChart1[i].Clicked(e.X, e.Y) != -1)
                    {
                        Debug.WriteLine("Series " + i + " clicked");
                        break;
                    }
                }
            }
        }

Best regards,
Manuel

[Sandra]

Hello buchi,

Thanks for your information. I have checked your workaround and it seems that works fine here too .

Thanks,