Hello,
It sounds like you may be heading in a different direction, but I thought I would offer my 2 cents. One possibility would be to update the point in the data array based on the mouse position in the MouseMove callback, and then replot the data. While it may not fully meet all your needs, a simple example of how to do this is below. Hopefully it can be of some use to you.
public partial class Form1 : Form
{
private Double[] xData = { 2, 4, 7, 8, 5, 4, 2 };
private Double[] yData = { 5, 8, 9, 6, 3, 2, 5 };
private int pointIndex;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
scatterGraph1.PlotXY(xData, yData);
}
private void scatterGraph1_MouseDown(object sender, MouseEventArgs e)
{
double xPoint;
double yPoint;
scatterPlot1.InverseMapDataPoint(scatterGraph1.Bounds, e.Location, out xPoint, out yPoint);
// This XYCursor is transparent in color, and it's
// SnapMode is set to NearestPoint
xyCursor1.MoveCursor(xPoint, yPoint);
Cursor.Current = Cursors.Hand;
}
private void scatterGraph1_AfterMoveCursor(object sender, NationalInstruments.UI.AfterMoveXYCursorEventArgs e)
{
pointIndex = xyCursor1.GetCurrentIndex();
}
private void scatterGraph1_MouseMove(object sender, MouseEventArgs e)
{
double xPoint;
double yPoint;
if (Cursor.Current == Cursors.Hand)
{
scatterPlot1.InverseMapDataPoint(scatterGraph1.Bounds, e.Location, out xPoint, out yPoint);
xData[pointIndex] = xPoint;
yData[pointIndex] = yPoint;
scatterGraph1.PlotXY(xData, yData);
}
}
private void scatterGraph1_MouseUp(object sender, MouseEventArgs e)
{
Cursor.Current = Cursors.Default;
}
}
NickB
National Instruments
