private void custom_OnMouseMove(object sender, MouseEventArgs e)
{
Point mousePoint;
double yPosition = 0, xPosition = 0, chartAreaYSpan = 0;
int seriesIndex = 0;
if (CurrentSeriesIndex >= 0 && CurrentSeriesIndex < this.Series.Count)
{
seriesIndex = CurrentSeriesIndex;
}
// Call HitTest
HitTestResult result = this.HitTest(e.X, e.Y);
ChartArea chartMainArea;
DataPoint point;
double resolution = 1;
if (this.Series.Count > 0)
{
if (firstMouseEntry == true)
{
setAxisCursorStyle();
firstMouseEntry = false;
}
// Get the chart Area object
chartMainArea = this.ChartAreas[0];
//Set Y-axis cursor interval
resolution = Helpers.MinimumDifference(this.Series[seriesIndex].Points.Select(pt => pt.YValues[0]).ToList());
if (resolution > 0)
{
chartMainArea.CursorY.Interval = resolution;
}
//Set X-axis cursor interval
resolution = Helpers.MinimumDifference(this.Series[seriesIndex].Points.Select(pt => pt.XValue).ToList());
if (resolution > 0)
{
chartMainArea.CursorX.Interval = resolution;
}
if (this.Series[seriesIndex].ChartType == SeriesChartType.Line)
{
//width of the inner chart area
double chartAreaWidth = chartMainArea.AxisX.ValueToPixelPosition(chartMainArea.AxisX.Maximum) -
chartMainArea.AxisX.ValueToPixelPosition(chartMainArea.AxisX.Minimum);
//height of the inner chart area
double chartAreaHeight = chartMainArea.AxisY.ValueToPixelPosition(chartMainArea.AxisY.Minimum) -
chartMainArea.AxisY.ValueToPixelPosition(chartMainArea.AxisY.Maximum);
//position (in pixels) of the cursor from the minimum inner chart x-position
double testposition = e.X - chartMainArea.AxisX.ValueToPixelPosition(chartMainArea.AxisX.Minimum);
if (this.Series.Count > 0)
{
//limit the cursor position to within the chart area
if (testposition < 0)
{
testposition = 0;
}
else if (testposition > chartAreaWidth)
{
testposition = chartAreaWidth;
}
//Gets the array index of the point (in the chart series) at the relative x-position of the cursor
double pt_index = (testposition / chartAreaWidth) * (double)this.Series[seriesIndex].Points.Count;
//make sure the array index is in bounds
if (pt_index >= (double)this.Series[seriesIndex].Points.Count)
{
pt_index = (double)this.Series[seriesIndex].Points.Count - 1;
}
if (pt_index >= 0)
{
//Set cursor to display as cross
if (this.Cursor != Cursors.WaitCursor)
{
this.Cursor = Cursors.Cross;
}
//Get the data point at the point index
point = this.Series[seriesIndex].Points[(int)pt_index];
if (lastPoint != null)
{
lastPoint.MarkerStyle = MarkerStyle.None;
if (point != lastPoint)
{
CurrentPoint = point;
CurrentPointIndex = (int)pt_index;
OnSelectedPointChanged(EventArgs.Empty);
}
}
//set the last point
lastPoint = point;
//Highlight the point at the current x-position
point.BackSecondaryColor = Color.White;
point.BackHatchStyle = ChartHatchStyle.Percent25;
point.MarkerStyle = MarkerStyle.Diamond;
point.MarkerSize = 5;
//Get the y-position (in pixels) of the highlighted data point
chartAreaYSpan = chartMainArea.AxisY.Maximum - chartMainArea.AxisY.Minimum;
yPosition = chartMainArea.AxisY.ValueToPixelPosition(point.YValues[0]);
xPosition = e.X;
}
}
}
else if (this.Series[seriesIndex].ChartType == SeriesChartType.Point)
{
xPosition = (double)e.X;
yPosition = (double)e.Y;
if (result.PointIndex > 0)
{
//point = (DataPoint)this.Series[seriesIndex].Points[result.PointIndex];
//if (lastPoint != null)
//{
// lastPoint.MarkerStyle = MarkerStyle.None;
//}
////set the last point
//lastPoint = point;
//lastPointIsHovered = true;
////Highlight the point at the current x-position
//point.BackSecondaryColor = Color.White;
//point.BackHatchStyle = ChartHatchStyle.Percent25;
//point.MarkerStyle = MarkerStyle.Diamond;
//point.MarkerColor = Color.Black;
//point.MarkerSize = 10;
}
else
{
lastPointIsHovered = false;
}
}
// Move the crosshair cursor
mousePoint = new Point((int)xPosition, (int)yPosition);
chartMainArea.CursorX.SetCursorPixelPosition(mousePoint, true);
chartMainArea.CursorY.SetCursorPixelPosition(mousePoint, true);
}
//this.Invalidate();
}
