void OnAxisCursorValueChanged(object sender, EventArgs e)
{
m_Point.XValues.Clear();
m_Point.Values.Clear();
double xValue = m_HorizontalAxisCursor.Value;
List <double> intersections = m_Line.IntersectWithXValue(xValue);
for (int i = 0; i < intersections.Count; i++)
{
m_Point.XValues.Add(xValue);
m_Point.Values.Add(intersections[i]);
}
double yValue = m_VerticalAxisCursor.Value;
intersections = m_Line.IntersectWithYValue(yValue);
for (int i = 0; i < intersections.Count; i++)
{
m_Point.XValues.Add(intersections[i]);
m_Point.Values.Add(yValue);
}
nChartControl1.Refresh();
}
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
// fill the combo
WebExamplesUtilities.FillComboWithValues(XValueDropDownList, 10, 90, 10);
WebExamplesUtilities.FillComboWithValues(YValueDropDownList, 10, 90, 10);
}
nChartControl1.BackgroundStyle.FrameStyle.Visible = false;
nChartControl1.Settings.JitterMode = JitterMode.Enabled;
// set a chart title
NLabel title = nChartControl1.Labels.AddHeader("Intersect Line With X/Y Value");
title.TextStyle.FontStyle = new NFontStyle("Times New Roman", 14, FontStyle.Italic);
title.TextStyle.ShadowStyle.Type = ShadowType.LinearBlur;
NChart chart = nChartControl1.Charts[0];
// 2D line chart
chart.BoundsMode = BoundsMode.Stretch;
chart.Axis(StandardAxis.PrimaryX).ScaleConfigurator = GetScaleConfigurator();
chart.Axis(StandardAxis.PrimaryY).ScaleConfigurator = GetScaleConfigurator();
chart.Axis(StandardAxis.Depth).Visible = false;
NAxisCollection axes = chart.Axes;
// add point series
NPointSeries point = (NPointSeries)chart.Series.Add(SeriesType.Point);
point.UseXValues = true;
point.FillStyle = new NColorFillStyle(Color.Red);
point.DataLabelStyle.Visible = false;
point.Size = new NLength(2);
NLineSeries line = new NLineSeries();
chart.Series.Add(line);
line.Name = "Point 1";
line.FillStyle = new NColorFillStyle(Color.Red);
line.BorderStyle.Color = Color.Pink;
line.DataLabelStyle.Visible = false;
line.UseXValues = true;
line.InflateMargins = true;
// fill with data
Random rand = new Random();
double radius = 0;
double angle = 0;
int dataPointCount = 1000;
double rStep = 50.0 / dataPointCount;
double aStep = 10.0;
for (int i = 0; i < dataPointCount; i++)
{
double y = Math.Sin(angle * 0.0174533f) * radius;
double x = Math.Cos(angle * 0.0174533f) * radius;
line.XValues.Add(50.0 + x);
line.Values.Add(50.0 + y);
radius += rStep;
angle += aStep;
}
point.XValues.Clear();
point.Values.Clear();
NAxisConstLine horizontalAxisCursor = new NAxisConstLine();
NAxisConstLine verticalAxisCursor = new NAxisConstLine();
chart.Axis(StandardAxis.PrimaryX).ConstLines.Add(horizontalAxisCursor);
chart.Axis(StandardAxis.PrimaryY).ConstLines.Add(verticalAxisCursor);
double xValue = (XValueDropDownList.SelectedIndex + 1) * 10;
double yValue = (YValueDropDownList.SelectedIndex + 1) * 10;
horizontalAxisCursor.Value = xValue;
List <double> intersections = line.IntersectWithXValue(xValue);
for (int i = 0; i < intersections.Count; i++)
{
point.XValues.Add(xValue);
point.Values.Add(intersections[i]);
}
verticalAxisCursor.Value = yValue;
intersections = line.IntersectWithYValue(yValue);
for (int i = 0; i < intersections.Count; i++)
{
point.XValues.Add(intersections[i]);
point.Values.Add(yValue);
}
// apply layout
ApplyLayoutTemplate(0, nChartControl1, chart, title, null);
}