/// <summary>
/// Gets the boundaries (top, left, bottom, right) of this chart's visible
/// data in the same units as the data. The ZoomChanged callback provides
/// the same data.
/// </summary>
/// <param name="ptrChart">The chart.</param>
/// <returns>Boundaries (<see cref="ChartExtents"/>) of the chart.</returns>
public static ChartExtents GetBoundariesOfVisibleData(this Chart ptrChart)
{
if (ptrChart.ChartAreas.Count < 1)
{
throw new InvalidOperationException("Missing chart area");
}
ChartArea ptrChartArea = ptrChart.ChartAreas[0];
ChartExtents extents = ExtentsFromCurrentView(ptrChartArea);
return(extents);
}
private static ChartExtents ExtentsFromDataCoordinates(double left, double top, double right,
double bottom)
{
//NOTE: Height needs to be negative because we always
// specify the *top* left corner
var rect = new RectangleF((float)left, (float)top,
(float)(right - left), (float)(bottom - top));
var extents = new ChartExtents
{
PrimaryExtents = rect
};
return(extents);
}
private void ZoomChanged(ChartExtents extents)
{
RectangleF e = extents.PrimaryExtents;
lblZoomExtents.Text = string.Format(ZoomChangedDisplayFormatLeftRightTopBottom,
e.Left, e.Right, e.Top, e.Bottom);
}
private static ChartExtents ExtentsFromDataCoordinates(double left, double top, double right,
double bottom)
{
//NOTE: Height needs to be negative because we always
// specify the *top* left corner
var rect = new RectangleF((float) left, (float) top,
(float) (right - left), (float) (bottom - top));
var extents = new ChartExtents
{
PrimaryExtents = rect
};
return extents;
}
