I'm trying to use the AxisBreaksTool to hide a particular area on the chart. i.e., particular range of values on the Y-Axis.
But the tChart1.Axes.Left.CalcPosPoint() method malfunctions after adding an AxisBreak.
Here is the sample code for your reference.
Code: Select all
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 Steema.TeeChart.Styles;
using Steema.TeeChart.Tools;
namespace AxisBreakTest
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
tChart1.Aspect.View3D = false;
}
private void Form1_Load(object sender, EventArgs e)
{
FastLine series = new FastLine(tChart1.Chart);
FillSampleValues(series, 100);
tChart1.Axes.Left.SetMinMax(1, 10);
tChart1.Zoom.Allow = false;
axisBreaksTool1.GapSize = 0;
}
private void FillSampleValues(FastLine series, int count)
{
Random r = new Random(0);
for (int i = 1; i <= count; i++)
{
series.Add(i, r.Next(100));
}
}
private void tChart1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == System.Windows.Forms.MouseButtons.Left)
{
double minimum = 1;
double maximum = 10;
// NOTE: This is where the problem occurs.
double yValue = tChart1.Axes.Left.CalcPosPoint(e.Y);
if (yValue >= maximum)
{
// If the user has clicked on or above the top edge of the chart,
// apply a break from 9-10
minimum = 9;
}
else
{
minimum = Math.Floor(yValue);
maximum = minimum + 1;
}
MessageBox.Show(minimum + " --> " + maximum);
AxisBreak categoryBreak = new AxisBreak(axisBreaksTool1);
categoryBreak.StartValue = minimum;
categoryBreak.EndValue = maximum;
categoryBreak.Style = AxisBreakStyle.None;
categoryBreak.Enabled = true;
}
else if (e.Button == System.Windows.Forms.MouseButtons.Right)
{
axisBreaksTool1.Breaks.Clear();
}
}
}
}
1. Display a chart with YRange 1-10.
2. Whenever user clicks on the chart, capture the mouse position and find the corresponding Y value on the left axis using
double yValue = tChart1.Axes.Left.CalcPosPoint(e.Y)
3. Based on the yValue hide a particular region on the left axis. Say if the user has clicked on 5.5, then hide the range 5-6 in the left axis.
4. Clear the breaks on right click.
This works fine if I click on 5.5 first and then click on 4.5, then 3.5 etc.,
But tChart1.Axes.Left.CalcPosPoint() gives invalid Y Values when I do it in vice versa. i.e., first 3.5 and then 4.5.
Could you please help me out on this ?
Is there any other way through which I can achieve this functionality ?
Thanks in advance.
