Steema Central

Posted: **Mon Feb 14, 2011 6:42 am**

Greetings and salutations,

I have the need to draw a free form triangle on a chart, and have a drag handle at each vertex.

Is there any way to do such a shape, I thought of using 3 Drawlines but they will overlap at the vertices and one handle will never be clicked and my triangle will come apart when dragged at a vertex.

Is there an existing tool that has 3 "handles " in which case I could make a copy of that class and adapt it to draw what I need, as I have done with the Drawline.cs class.

The drawing of a triangle I am not bothered with its getting a decent interaction with the mouse, i.e. selecting and dragging the points on the chart.

Regards Phil.

Posted: **Mon Feb 14, 2011 6:19 pm**

Hello Phil,

I have made a simple example using a line series and Drag Point Tool and you can use it as do in below line:

Code: Select all

        Steema.TeeChart.Styles.Line line1;
        Steema.TeeChart.Tools.DragPoint drag;
        private void InitializeChart()
        {
            tChart1.Aspect.View3D = false;
            line1 = new Steema.TeeChart.Styles.Line(tChart1.Chart);
            chartController1.Chart = tChart1;
            drag = new Steema.TeeChart.Tools.DragPoint(tChart1.Chart);
            line1.XValues.Order = Steema.TeeChart.Styles.ValueListOrder.None;
            line1.Pointer.Visible = true;
            line1.Add(1, 1);
            line1.Add(2, 2);
            line1.Add(3, 1);
            line1.Add(1, 1);
            drag.Series = line1;

            tChart1.Axes.Left.SetMinMax(0, 4);
            tChart1.Axes.Bottom.SetMinMax(0, 6);
            tChart1.MouseMove += new MouseEventHandler(tChart1_MouseMove);
            drag.Drag += new Steema.TeeChart.Tools.DragPointEventHandler(drag_Drag); 

        }

        void drag_Drag(Steema.TeeChart.Tools.DragPoint sender, int index)
        {
            int index1 = line1.Count - 1;
            if (line1.Clicked(X, Y) != -1)
            {
               
                    drag.Series.XValues.Value[0] = drag.Series.XScreenToValue(X);
                    drag.Series.YValues.Value[0] = drag.Series.XScreenToValue(Y);
                    drag.Series.XValues.Value[index1] = drag.Series.XScreenToValue(X);
                    drag.Series.YValues.Value[index1] = drag.Series.XScreenToValue(Y);

            }
        }
        int X;
        int Y;
        void tChart1_MouseMove(object sender, MouseEventArgs e)
        {
            X = e.X;
            Y = e.Y;
        }

Could you please, tell us if previous code works as you want?

I hope will helps.

Thanks,

Steema Central

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