I have got an aplication like this: With the textboxes below the chart the user can set the min and max of the X-Axis of the Chart. This is the code for it:
private void textBoxXaxisMin_TextChanged(object sender, EventArgs e)
{
double x;
//checks if the input is a double and smaller than the max value
//if (Double.TryParse(this.textBoxXaxisMin.Text, out x) && x < chart1.ChartAreas[0].AxisX.Maximum)
if (Double.TryParse(this.textBoxXaxisMin.Text, out x))
{
this.textBoxXaxisMin.BackColor = Color.White;
chart1.ChartAreas[0].AxisX.Minimum = Convert.ToDouble(this.textBoxXaxisMin.Text);
//changeYScalaMin(chartCharacteristicCurvesThermoelemts, Convert.ToDouble(this.textBoxCharacteristicCurvesThermoelementXmin.Text), Convert.ToDouble(this.textBoxCharacteristicCurvesThermoelementXmax.Text));
//method to scale y axis
}
else
//if the textbox is not highlighted
this.textBoxXaxisMin.BackColor = Color.Orange;
//calls the Max Function to update the chart if the Max-value is now valid
double y;
//checks if the input is a double and greater than the min value
if (Double.TryParse(this.textBoxXaxisMax.Text, out y) && y > chart1.ChartAreas[0].AxisX.Minimum)
{
this.textBoxXaxisMax.BackColor = Color.White;
chart1.ChartAreas[0].AxisX.Maximum = Convert.ToDouble(this.textBoxXaxisMax.Text);
//method to scale y axis
}
else
//if the textbox is not highlighted
this.textBoxXaxisMax.BackColor = Color.Orange;
}
Now I would like to have the Y-axis scaled automatically. Y-min should be calulated as the min value of all series in the section of (X-min and X-max) and the Y-max as the maximum of all series in the selected section. My problem is the implementation.
In this example, Y-min should be changed to about 50.
I hosted the hole exampleproject here at GitHup .
This will scale the Y-Axis to the Minimum and Maximum values between the Minimum and Maximum values[0] of the X-Axis for all series from 0 to 1:
double max = Double.MinValue;
double min = Double.MaxValue;
double leftLimit = chart1.ChartAreas[0].AxisX.Minimum;
double rightLimit = chart1.ChartAreas[0].AxisX.Maximum;
for (int s = 0; s <= 1; s++)
{
foreach (DataPoint dp in chart1.Series[s].Points)
{
if (dp.XValue >= leftLimit && dp.XValue <= rightLimit)
{
min = Math.Min(min, dp.YValues[0]);
max = Math.Max(max, dp.YValues[0]);
}
}
}
chart1.ChartAreas[0].AxisY.Maximum = max;
chart1.ChartAreas[0].AxisY.Minimum = min;
Edit: While testing I noticed that resetting the Min&Max Values is not quite obvious. Here is how:
chart1.ChartAreas[0].AxisY.Minimum = Double.NaN;
chart1.ChartAreas[0].AxisY.Maximum = Double.NaN;
chart1.ChartAreas[0].AxisX.Minimum = Double.NaN;
chart1.ChartAreas[0].AxisX.Maximum = Double.NaN;
轴最小值自动设置为0,只需使用IsStartesFromZero属性:
chart.ChartAreas[0].AxisY.IsStartedFromZero = false;
The code I used for my project is: (based on @TaW's answer)
private void changeYScala(object chart)
{
double max = Double.MinValue;
double min = Double.MaxValue;
Chart tmpChart = (Chart)chart;
double leftLimit = tmpChart.ChartAreas[0].AxisX.Minimum;
double rightLimit = tmpChart.ChartAreas[0].AxisX.Maximum;
for (int s = 0; s < tmpChart.Series.Count(); s++)
{
foreach (DataPoint dp in tmpChart.Series[s].Points)
{
if (dp.XValue >= leftLimit && dp.XValue <= rightLimit)
{
min = Math.Min(min, dp.YValues[0]);
max = Math.Max(max, dp.YValues[0]);
}
}
}
//tmpChart.ChartAreas[0].AxisY.Maximum = max;
tmpChart.ChartAreas[0].AxisY.Maximum = (Math.Ceiling((max / 10)) * 10);
tmpChart.ChartAreas[0].AxisY.Minimum = (Math.Floor((min / 10)) * 10);
//tmpChart.ChartAreas[0].AxisY.Minimum = min;
}
This method is called in the question code above with:
changeYScala(chart1);
don't forget to include:
using System.Windows.Forms.DataVisualization.Charting;
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