By François Chauvineau - Monday, January 14, 2013
Hi,
I try to select points of my chart.
I draw an rectangle and obtains the coordinate of my rectangle.
Then, I use the method HitTest of my ChartControl, and obtains always no results.
Here is my code :
void customDataZoom_EndDrag(object sender, EventArgs e)
{
//PointDebut is define on mouse down
PointFin = new Point(Cursor.Position.X, Cursor.Position.Y);
Point monPointDansGraphDeb = nChartControl1.PointToClient(PointDebut);
Point monPointDansGraphFin = nChartControl1.PointToClient(PointFin);
NRectangleF maZone = new NRectangleF((float)monPointDansGraphDeb.X,
(float)monPointDansGraphDeb.Y,
Math.Abs((float)monPointDansGraphDeb.X - (float)monPointDansGraphFin.X),
Math.Abs((float)monPointDansGraphDeb.Y - (float)monPointDansGraphFin.Y));
NHitTestResult[] mesPoints = nChartControl1.HitTest(maZone, true);
//--> mesPoints is alway empty
}
Thanks for your help.
François
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By François Chauvineau - Tuesday, January 15, 2013
I contacted the support.
Here the solution :
using System;
using System.Drawing;
using System.Windows.Forms;
using Nevron.Chart;
using Nevron.Chart.WinForm;
using Nevron.GraphicsCore;
namespace WindowsFormsApplication10
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
NRangeSelection m_RangeSelection;
NPointSeries m_Point;
///
/// Overrides the standard data zoom tool.
///
class NCustomDataZoom : NDataZoomTool
{
public NCustomDataZoom()
{
}
public override void OnEndDrag(object sender, MouseEventArgs e)
{
// just hide the range selection and repaint (no zooming is performed)
base.HideRangeSelections();
base.Deactivate();
base.RepaintOverlay();
}
}
private void Form1_Load(object sender, EventArgs e)
{
// create a chart with some dummy data
NCartesianChart chart1 = (NCartesianChart)nChartControl1.Charts[0];
m_Point = new NPointSeries();
m_Point.DataLabelStyle.Visible = false;
m_Point.UseXValues = true;
Random rand = new Random();
for (int i = 0; i < 100; i++)
{
m_Point.Values.Add(rand.Next(100));
m_Point.XValues.Add(rand.Next(100));
}
chart1.Series.Add(m_Point);
m_RangeSelection = new NRangeSelection();
chart1.RangeSelections.Add(m_RangeSelection);
nChartControl1.Controller.Tools.Add(new NSelectorTool());
NCustomDataZoom dataZoomTool = new NCustomDataZoom();
dataZoomTool.EndDrag +=new EventHandler(dataZoomTool_EndDrag);
nChartControl1.Controller.Tools.Add(dataZoomTool);
}
void dataZoomTool_EndDrag(object sender, EventArgs e)
{
// get the selected ranges
NRange1DD xRange = m_RangeSelection.HorizontalAxisRange;
NRange1DD yRange = m_RangeSelection.VerticalAxisRange;
xRange.Normalize();
yRange.Normalize();
int count = m_Point.Values.Count;
m_Point.FillStyles.Clear();
for (int i = 0; i < count; i++)
{
// color the data point in red if contained in the selection
bool contained = xRange.Contains((double)m_Point.XValues[i]) && yRange.Contains((double)m_Point.Values[i]);
if (contained)
{
m_Point.FillStyles[i] = new NColorFillStyle(Color.Red);
}
}
nChartControl1.Refresh();
}
}
}
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