/// <summary>
/// Gets the data point from the specified point
/// </summary>
/// <param name="point"></param>
/// <returns></returns>
protected int GetDataPointIndexFromPoint(NPoint point)
{
NPointSeries pointSeries = m_DragPlane.PointSeries;
NChart chart = pointSeries.Chart;
NModel3DToViewTransformation model3DToViewTransformation = new NModel3DToViewTransformation(GetView().Context, chart.Projection);
float xHotSpotArea = 10;
float yHotSpotArea = 10;
int dataPointIndex = -1;
for (int i = 0; i < pointSeries.Values.Count; i++)
{
double x = (double)pointSeries.XValues[i];
double y = (double)pointSeries.Values[i];
double z = (double)pointSeries.ZValues[i];
NVector3DF vecModelPoint;
vecModelPoint.X = chart.Axis(StandardAxis.PrimaryX).TransformScaleToModel(false, x);
vecModelPoint.Y = chart.Axis(StandardAxis.PrimaryY).TransformScaleToModel(false, y);
vecModelPoint.Z = chart.Axis(StandardAxis.Depth).TransformScaleToModel(false, z);
NPointF viewPoint = NPointF.Empty;
model3DToViewTransformation.Transform(vecModelPoint, ref viewPoint);
if (Math.Abs(viewPoint.X - point.X) < xHotSpotArea &&
Math.Abs(viewPoint.Y - point.Y) < yHotSpotArea)
{
dataPointIndex = i;
break;
}
}
return(dataPointIndex);
}
public override void OnAfterPaint(NPanel panel, NPanelPaintEventArgs eventArgs)
{
if (m_Parent.m_bUpdateWatermark == false)
{
return;
}
// intercepts the on chart after paint event and converts
// point or XYZ coordniates to chart viewport coordinates
// used to position the custom watermark
NChartControl chartControl = m_Parent.nChartControl1;
NWatermark watermark = chartControl.Watermarks[0];
NChart chart = m_Parent.nChartControl1.Charts[0];
NPointF viewPoint = new NPointF();
NVector3DF vecModelPoint = new NVector3DF();
NModel3DToViewTransformation model3DToViewTransformation = new NModel3DToViewTransformation(chartControl.View.Context, chart.Projection);
switch (m_Parent.WatermarkPositionComboBox.SelectedIndex)
{
case 0:
vecModelPoint.X = chart.Axis(StandardAxis.PrimaryX).TransformScaleToModel(false, (double)m_Parent.XPositionNumericUpDown.Value);
vecModelPoint.Y = chart.Axis(StandardAxis.PrimaryY).TransformScaleToModel(false, (double)m_Parent.YPositionNumericUpDown.Value);
vecModelPoint.Z = chart.Axis(StandardAxis.Depth).TransformScaleToModel(false, (double)m_Parent.ZPositionNumericUpDown.Value);
break;
case 1:
NVector3DF vecPoint = new NVector3DF();
int nIndex = (int)m_Parent.DataPointNumericUpDown.Value;
vecPoint.X = (float)(double)(m_Parent.m_Point.XValues[nIndex]);
vecPoint.Y = (float)(double)(m_Parent.m_Point.Values[nIndex]);
vecPoint.Z = (float)(double)(m_Parent.m_Point.ZValues[nIndex]);
vecModelPoint.X = chart.Axis(StandardAxis.PrimaryX).TransformScaleToModel(false, vecPoint.X);
vecModelPoint.Y = chart.Axis(StandardAxis.PrimaryY).TransformScaleToModel(false, vecPoint.Y);
vecModelPoint.Z = chart.Axis(StandardAxis.Depth).TransformScaleToModel(false, vecPoint.Z);
break;
}
model3DToViewTransformation.Transform(vecModelPoint, ref viewPoint);
// convert the view point to parent pixel coordinates
watermark.TransformViewPointToParent(ref viewPoint);
watermark.Location = new NPointL(
new NLength(viewPoint.X, NGraphicsUnit.Pixel),
new NLength(viewPoint.Y, NGraphicsUnit.Pixel));
m_Parent.nChartControl1.RecalcLayout();
}
/// <summary>
/// Return true if dragging can start
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
/// <returns></returns>
public override bool CanBeginDrag(object sender, Nevron.Chart.Windows.NMouseEventArgs e)
{
if (!base.CanBeginDrag(sender, e))
{
return(false);
}
NPoint point = new NPoint(e.X, e.Y);
NPointSeries pointSeries = m_DragPlane.PointSeries;
NChart chart = pointSeries.Chart;
NModel3DToViewTransformation model3DToViewTransformation = new NModel3DToViewTransformation(GetView().Context, chart.Projection);
float xHotSpotArea = 10;
float yHotSpotArea = 10;
int dataPointIndex = -1;
for (int i = 0; i < pointSeries.Values.Count; i++)
{
double x = (double)pointSeries.XValues[i];
double y = (double)pointSeries.Values[i];
double z = (double)pointSeries.ZValues[i];
NVector3DF vecModelPoint;
vecModelPoint.X = chart.Axis(StandardAxis.PrimaryX).TransformScaleToModel(false, x);
vecModelPoint.Y = chart.Axis(StandardAxis.PrimaryY).TransformScaleToModel(false, y);
vecModelPoint.Z = chart.Axis(StandardAxis.Depth).TransformScaleToModel(false, z);
NPointF viewPoint = NPointF.Empty;
model3DToViewTransformation.Transform(vecModelPoint, ref viewPoint);
if (Math.Abs(viewPoint.X - point.X) < xHotSpotArea &&
Math.Abs(viewPoint.Y - point.Y) < yHotSpotArea)
{
dataPointIndex = i;
break;
}
}
if (dataPointIndex == -1)
{
return(false);
}
m_DataPointIndex = dataPointIndex;
m_OriginalPosition = m_DragPlane.GetVectorFromPoint(m_DataPointIndex);
return(true);
}