我有一个这样的应用:
@H_301_2@使用图表下方的文本框,用户可以设置图表的X轴的最小值和最大值.这是它的代码:
@H_301_2@现在我想让Y轴自动缩放.应将Y-min计算为(X-min和X-max)部分中所有系列的最小值,并将Y-max计算为所选部分中所有系列的最大值.我的问题是实施. @H_301_2@在此示例中,Y-min应更改为大约50. @H_301_2@我在GitHup处主持了这个漏洞示例项目.
- 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;
- }
解决方法
对于从0到1的所有系列,这会将Y轴缩放到X轴的最小值和最大值[0]之间的最小值和最大值:
@H_301_2@编辑:测试时我注意到重置最小值和最大值并不是很明显.方法如下:
- 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;
- 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;