void Place(LabelState label)
{
if (label.IsVisible && label.IsMovable)
{
var sz = label.Size;
var min_offset = Math.Sqrt(sz.Width * sz.Width + sz.Height * sz.Height);
var range = MaxOffset - min_offset;
if (range < 0)
{
range = 0;
}
var offset = min_offset + rnd.NextDouble() * range;
double angle = 0;
if (Angles != null && Angles.Count > 0)
{
angle = Angles[rnd.Next(Angles.Count)] * Math.PI / 180;
}
else
{
angle = rnd.NextDouble() * Math.PI * 2;
}
var center = new Point(label.Point.X + offset * Math.Cos(angle), label.Point.Y + offset * Math.Sin(angle));
label.Position = new Point(center.X - 0.5 * sz.Width, center.Y - 0.5 * sz.Height);
}
}
// set label position relatively to anchor point
static void SetPosition(LabelState label, LabelPosition position)
{
if (!label.IsMovable)
{
return;
}
var sz = label.Size;
switch (position)
{
case LabelPosition.TopLeft:
label.Position = label.Point;
break;
case LabelPosition.TopRight:
label.Position = new Point(label.Point.X - sz.Width, label.Point.Y);
break;
case LabelPosition.BottomLeft:
label.Position = new Point(label.Point.X, label.Point.Y - sz.Height);
break;
case LabelPosition.BottomRight:
label.Position = new Point(label.Point.X - sz.Width, label.Point.Y - sz.Height);
break;
}
}
static double GetDistanceFromBorder(LabelState label, Rect border)
{
var pt = label.Point;
var dx = Math.Min(pt.X - border.Left, border.Right - pt.X);
var dy = Math.Min(pt.Y - border.Top, border.Bottom - pt.Y);
return(Math.Min(dx, dy));
}
internal static LabelState[] CreateState(IList<ILabel> labels)
{
int cnt = labels.Count;
var state = new LabelState[cnt];
for (int i = 0; i < cnt; i++)
state[i] = new LabelState(labels[i]);
return state;
}
// verify whether the current label position is good relatively to the other labels
static bool IsGoodPosition(LabelState lbl, Rect border, LabelState[] labels, IList <Rect> rects, int index)
{
// check border
if (!Contains(lbl, border))
{
return(false);
}
if (rects != null)
{
int cnt = rects.Count;
for (int i = 0; i < cnt; i++)
{
if (Intersect(lbl, rects[i]))
{
return(false);
}
}
}
// check other anchor points
int len = labels.Length;
for (int i = 0; i < len; i++)
{
if (i != index)
{
if (IntersectPoint(lbl, labels[i].Point))
{
return(false);
}
}
}
for (int i = 0; i < index; i++)
{
// check already placed labels
if (labels[i].IsVisible)
{
// label rectangle
if (Intersect(lbl, labels[i]))
{
return(false);
}
// connecting lines
if (!LabelHelper.Intersect(lbl.Point, lbl.GetConnectingPoint(), labels[i].Point, labels[i].GetConnectingPoint()).IsEmpty())
{
return(false);
}
}
}
return(true);
}
internal static LabelState[] CreateState(IList <ILabel> labels)
{
int cnt = labels.Count;
var state = new LabelState[cnt];
for (int i = 0; i < cnt; i++)
{
state[i] = new LabelState(labels[i]);
}
return(state);
}
// set label position relatively to anchor point with specified angle and offset
static void SetPosition(LabelState label, double angle, double offset)
{
if (!label.IsMovable)
{
return;
}
angle = angle * Math.PI / 180;
var sz = label.Size;
var center = new Point(label.Point.X + offset * Math.Cos(angle), label.Point.Y + offset * Math.Sin(angle));
label.Position = new Point(center.X - 0.5 * sz.Width, center.Y - 0.5 * sz.Height);
}
static int CompareLabelsByDistanceFromBorder(LabelState label1, LabelState label2)
{
return(Math.Sign(label1.DistanceFromBorder - label2.DistanceFromBorder));
}
// set label position relatively to anchor point with specified angle and offset
static void SetPosition(LabelState label, double angle, double offset)
{
if (!label.IsMovable)
return;
angle = angle * Math.PI / 180;
var sz = label.Size;
var center = new Point(label.Point.X + offset * Math.Cos(angle), label.Point.Y + offset * Math.Sin(angle));
label.Position = new Point(center.X - 0.5 * sz.Width, center.Y - 0.5 * sz.Height);
}
// set label position relatively to anchor point
static void SetPosition(LabelState label, LabelPosition position)
{
if (!label.IsMovable)
return;
var sz = label.Size;
switch (position)
{
case LabelPosition.TopLeft:
label.Position = label.Point;
break;
case LabelPosition.TopRight:
label.Position = new Point(label.Point.X - sz.Width, label.Point.Y);
break;
case LabelPosition.BottomLeft:
label.Position = new Point(label.Point.X, label.Point.Y - sz.Height);
break;
case LabelPosition.BottomRight:
label.Position = new Point(label.Point.X - sz.Width, label.Point.Y - sz.Height);
break;
}
}
// verify whether the current label position is good relatively to the other labels
static bool IsGoodPosition(LabelState lbl, Rect border, LabelState[] labels, IList<Rect> rects, int index)
{
// check border
if( !Contains(lbl, border))
return false;
if (rects != null)
{
int cnt = rects.Count;
for (int i = 0; i < cnt; i++)
{
if (Intersect(lbl, rects[i]))
return false;
}
}
// check other anchor points
int len = labels.Length;
for (int i = 0; i < len; i++)
{
if (i != index)
{
if (IntersectPoint(lbl, labels[i].Point))
return false;
}
}
for (int i = 0; i < index; i++)
{
// check already placed labels
if (labels[i].IsVisible)
{
// label rectangle
if (Intersect(lbl, labels[i]))
return false;
// connecting lines
if (!LabelHelper.Intersect(lbl.Point, lbl.GetConnectingPoint(), labels[i].Point, labels[i].GetConnectingPoint()).IsEmpty())
return false;
}
}
return true;
}
static double GetDistanceFromBorder(LabelState label, Rect border)
{
var pt = label.Point;
var dx = Math.Min(pt.X - border.Left, border.Right - pt.X);
var dy = Math.Min(pt.Y - border.Top, border.Bottom - pt.Y);
return Math.Min(dx, dy);
}
static int CompareLabelsByDistanceFromBorder(LabelState label1, LabelState label2)
{
return Math.Sign( label1.DistanceFromBorder - label2.DistanceFromBorder);
}
void Place(LabelState label)
{
if( label.IsVisible && label.IsMovable)
{
var sz = label.Size;
var min_offset = Math.Sqrt(sz.Width * sz.Width + sz.Height * sz.Height);
var range = MaxOffset - min_offset;
if (range < 0)
range = 0;
var offset = min_offset + rnd.NextDouble() * range;
double angle = 0;
if (Angles != null && Angles.Count > 0)
angle = Angles[rnd.Next(Angles.Count)] * Math.PI / 180;
else
angle = rnd.NextDouble() * Math.PI * 2;
var center = new Point(label.Point.X + offset * Math.Cos(angle), label.Point.Y + offset * Math.Sin(angle));
label.Position = new Point(center.X - 0.5 * sz.Width, center.Y - 0.5 * sz.Height);
}
}