void PaintLinkLine(Link link, RenderArgs e)
{
Rectangle rect1 = link.From.Bounds;
Rectangle rect2 = link.Target.Bounds;
// if bounds changed, rebuild layout info
if (rect1 != link.LayoutData.StartBounds || rect2 != link.LayoutData.EndBounds)
{
link.RefreshLayout();
}
// draw line
var layout = link.LayoutData;
Color color = link.Color.IsEmpty ? e.Chart.LinkLineColor : link.Color;
var pen = e.Graphics.Pen(color, link.LineWidth, link.LineStyle);
e.Graphics.DrawBezier(pen, layout.StartPoint, layout.ControlPoint1, layout.ControlPoint2, layout.EndPoint,
link.StartCap, link.EndCap);
//text
if (!string.IsNullOrEmpty(link.Text))
{
var pt = BezierHelper.GetPoint(layout.StartPoint, layout.ControlPoint1, layout.ControlPoint2, layout.EndPoint, 0.5f);
var size = Size.Ceiling(e.Graphics.MeasureString(link.Text, e.Font));
var rectText = new Rectangle(pt.X - size.Width / 2, pt.Y - size.Height / 2, size.Width, size.Height);
if (!e.Chart.BackColor.IsEmpty)
{
e.Graphics.FillRectangle(e.Graphics.SolidBrush(Color.FromArgb(180, e.Chart.BackColor)), rectText);
}
if (!e.Chart.ForeColor.IsEmpty)
{
var font2 = e.Font;
if (!string.IsNullOrEmpty(link.Hyperlink))
{
font2 = e.Graphics.Font(e.Font, e.Font.Style | FontStyle.Underline);
}
var sf = PaintHelper.SFCenter;
e.Graphics.DrawString(link.Text, font2, e.Graphics.SolidBrush(e.Chart.ForeColor), rectText, sf);
}
link.LayoutData.TextBounds = rectText;
}
else
{
link.LayoutData.TextBounds = Rectangle.Empty;
}
// remark-icon
if (e.ShowRemarkIcon && link.HaveRemark)
{
Image iconRemark = Properties.Resources.note_small;
Point pt = BezierHelper.GetPoint(layout.StartPoint, layout.ControlPoint1, layout.ControlPoint2, layout.EndPoint, 0.5f);
Rectangle rectRemark = new Rectangle(pt.X - iconRemark.Width / 2, pt.Y - iconRemark.Height / 2, iconRemark.Width, iconRemark.Height);
e.Graphics.DrawImage(iconRemark, rectRemark, 0, 0, iconRemark.Width, iconRemark.Height);
}
}
BezierLayoutInfo GetLayoutInfo(BezierControlPoint controlPoint1, BezierControlPoint controlPoint2)
{
var layout = new BezierLayoutInfo();
layout.CP1 = controlPoint1;
layout.CP2 = controlPoint2;
Point cp1, cp2;
Rectangle rect1 = From.Bounds;
Rectangle rect2 = Target.Bounds;
Point pts = PaintHelper.CenterPoint(rect1);
Point ptd = PaintHelper.CenterPoint(rect2);
rect1.Inflate(2, 2);
rect2.Inflate(2, 2);
if (StartCap != LineAnchor.None)
{
rect1.Inflate(Layouter.LineAnchorSize, Layouter.LineAnchorSize);
}
if (EndCap != LineAnchor.None)
{
rect2.Inflate(Layouter.LineAnchorSize, Layouter.LineAnchorSize);
}
if (pts == ptd)
{
cp1 = pts;
cp2 = ptd;
layout.Bounds = Rectangle.Empty;
layout.Region = null;
}
else
{
cp1 = BezierHelper.GetControlPoint(pts, controlPoint1);
cp2 = BezierHelper.GetControlPoint(ptd, controlPoint2);
//Point[] controlPoints = GetControlPoints(pts, ptd);
Shape sShape = Shape.GetShaper(From);
pts = sShape.GetBorderPoint(rect1, cp1);
Shape dShape = Shape.GetShaper(Target);
ptd = sShape.GetBorderPoint(rect2, cp2);
GraphicsPath gp = new GraphicsPath();
gp.AddBezier(pts, cp1, cp2, ptd);
Pen penWiden = new Pen(Color.Black, LineWidth + 5);
gp.Widen(penWiden);
var rect = gp.GetBounds();
rect.Inflate(LineWidth, LineWidth);
layout.Bounds = rect;
layout.Region = new Region(gp);
}
Point ptCenter = BezierHelper.GetPoint(pts, cp1, cp2, ptd, 0.5f);
Rectangle textBounds = layout.TextBounds;
textBounds.X = ptCenter.X - layout.TextBounds.Width / 2;
textBounds.Y = ptCenter.Y - layout.TextBounds.Height / 2;
// cache layout info
layout.StartBounds = rect1;
layout.EndBounds = rect2;
layout.StartPoint = pts;
layout.EndPoint = ptd;
layout.ControlPoint1 = cp1;
layout.ControlPoint2 = cp2;
layout.TextBounds = textBounds;
return(layout);
}
