Hi,

I have a graph with 2 Y axis, one left one right and when I zoom I would like to zoom on both of them not just on the primary one. Could you tell me what I need to set for that?

Regards,
Daniel

The following code shows how to create a chart that zooms simultaneously on two axes (PrimaryY and SecondaryY):

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Nevron.Chart;
using Nevron.GraphicsCore;
using Nevron.Chart.WinForm;
using Nevron.SmartShapes;
using System.IO;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        NRangeSelection m_RangeSelection;
        NCartesianChart m_Chart;

        private void Form1_Load(object sender, EventArgs e)
        {
            m_Chart = (NCartesianChart)nChartControl1.Charts[0];
            m_RangeSelection = new NRangeSelection();
            m_Chart.RangeSelections.Add(m_RangeSelection);

            NLineSeries line1 = new NLineSeries();
            NLineSeries line2 = new NLineSeries();

            for (int i = 0; i < 10; i++)
            {
                line1.Values.Add(i);
                line2.Values.Add((10 - i) * 10);
            }

            m_Chart.Series.Add(line1);
            m_Chart.Series.Add(line2);

            line2.DisplayOnAxis(StandardAxis.PrimaryY, false);
            line2.DisplayOnAxis(StandardAxis.SecondaryY, true);

            m_Chart.Axis(StandardAxis.SecondaryY).Visible = true;

            nChartControl1.Controller.Tools.Add(new NSelectorTool());

            NDataZoomTool dzt = new NDataZoomTool();
            dzt.EndDrag += new EventHandler(dzt_EndDrag);
            nChartControl1.Controller.Tools.Add(dzt);
        }

        void dzt_EndDrag(object sender, EventArgs e)
        {
            NRange1DD horzRange = m_RangeSelection.HorizontalAxisRange;
            NRange1DD vertRange = m_RangeSelection.VerticalAxisRange;

            // gt relative y disposition of selected range
            double beginYFactor = m_Chart.Axis(StandardAxis.PrimaryY).Scale.ViewRange.GetValueFactor(horzRange.Begin);
            double endYFactor = m_Chart.Axis(StandardAxis.PrimaryY).Scale.ViewRange.GetValueFactor(horzRange.End);

            NRange1DD axisRange = m_Chart.Axis(StandardAxis.SecondaryY).Scale.ViewRange;

            double beginValue = axisRange.Begin + (axisRange.End - axisRange.Begin) * beginYFactor;
            double endValue = axisRange.Begin + (axisRange.End - axisRange.Begin) * endYFactor;

            if (m_RangeSelection.IsZoomIn())
            {
                m_Chart.Axis(StandardAxis.SecondaryY).PagingView.ZoomIn(new NRange1DD(beginValue, endValue), 0.0001);
            }
            else
            {
                m_Chart.Axis(StandardAxis.SecondaryY).PagingView.ZoomOut(new NRange1DD(beginValue, endValue), 0.0001);
            }
        }
    }
}

The idea is simple:
1. Intercept the EndDrag event of the data zoom tool.
2. Compute the relative position of the zoomed range vs the axis range.
3. Compute the zoom range based on the secondary axis range using this relative position.
4. Zoom In / Zoom out.

Best Regards,
Nevron Support Team

Thank you for the code,

It is half working. It zooms on the X axis for both but not on the Y axis. Is it working fine for you?

I have attached pictures about the graph in general and after zooming. As you can see it is zooms on the primary Y but no on the secondary.

Regards
Daniel