private static RectangleF GetRect(FlexChart flexChart, Line line)
{
var start = AnnoPointToCoords(flexChart, line, line.Start);
var end = AnnoPointToCoords(flexChart, line, line.End);
var x = Math.Min(start.X, end.X);
var y = Math.Min(start.Y, end.Y);
var width = Math.Abs(start.X - end.X);
var height = Math.Abs(start.Y - end.Y);
SizeF contentSize = new SizeF();
if (!string.IsNullOrEmpty(line.Content))
{
using (var g = flexChart.CreateGraphics())
{
contentSize = g.MeasureString(line.Content, line.ContentStyle.Font);
}
}
if (height == 0) //Horizontal line
{
height = line.Style.StrokeWidth + contentSize.Height;
y = y - height;
}
else if (width == 0) //Vertical line
{
width = line.Style.StrokeWidth + contentSize.Height;
}
return(new RectangleF(x, y, width, height));
}
private bool LineHitTest(PointF pt, int minDist = 0)
{
var line = annotation as Line;
var start = Helpers.AnnoPointToCoords(flexChart, line, line.Start);
var end = Helpers.AnnoPointToCoords(flexChart, line, line.End);
//Horizontal or Vertical lines
if (start.X == end.X || start.Y == end.Y)
{
return(BoundingRectangle.Contains(pt));
}
else
{
var lineWidth = line.Style.StrokeWidth;
double textHeight = 0;
if (!string.IsNullOrEmpty(line.Content))
{
using (var g = flexChart.CreateGraphics())
{
textHeight = g.MeasureString(line.Content, line.ContentStyle.Font).Height;
}
}
return((-pt.X * (start.Y - end.Y) - (start.X * end.Y - end.X * start.Y)) / (end.X - start.X) - (minDist + lineWidth / 2 + textHeight) < pt.Y &&
pt.Y < (-pt.X * (start.Y - end.Y) - (start.X * end.Y - end.X * start.Y)) / (end.X - start.X) + (minDist + lineWidth / 2));
}
}
