Transform axis value to pixel value and vice versa
18 Nov 20181 minute to read
SfChart offers two utility methods for converting your data points into pixel values (device coordinates).
- ValueToPoint(ChartAxis axis, double value)
- PointToValue(ChartAxis axis, Point point)
private void LineChart_MouseMove(object sender, MouseEventArgs e)
{
Point mousePoint = new Point
{
X = e.GetPosition(LineChart).X - LineChart.SeriesClipRect.Left,
Y = e.GetPosition(LineChart).Y - LineChart.SeriesClipRect.Top
};
// Converts mouse co-ordinate points into a value related to ChartAxis.
double xValue = this.LineChart.PointToValue(this.LineChart.PrimaryAxis, mousePoint);
double yValue = this.LineChart.PointToValue(this.LineChart.SecondaryAxis, mousePoint);
// Converts the data point value of the chart to Chart coordinate.
double chartPointX = this.LineChart.ValueToPoint(this.LineChart.PrimaryAxis, xValue);
double chartPointY = this.LineChart.ValueToPoint(this.LineChart.SecondaryAxis, yValue);
}