/// <summary>
/// Finds a point inside the polygon.
/// </summary>
public PointF GetInternalPoint()
{
int cvi = FindConvexVertex();
int prev = cvi > 0 ? cvi - 1 : _points.Count - 1;
int next = (cvi + 1) % _points.Count;
PointF v = _points[cvi];
PointF a = _points[prev];
PointF b = _points[next];
PointList pl = new PointList();
pl.Add(a); pl.Add(v); pl.Add(b);
Polygon avb = new Polygon(pl);
float minDist = float.MaxValue;
PointF intPt = v;
for (int i = 0; i < _points.Count; ++i)
{
if (i == cvi) continue;
if (i == prev) continue;
if (i == next) continue;
PointF q = _points[i];
if (avb.Contains(q))
{
float dist = (float)Math.Sqrt((q.X-v.X)*(q.X-v.X) + (q.Y-v.Y)*(q.Y-v.Y));
if (dist < minDist)
{
minDist = dist;
intPt = q;
}
}
}
if (intPt == v)
return new PointF((a.X + b.X) / 2, (a.Y + b.Y) / 2);
else
return new PointF((v.X + intPt.X)/ 2, (v.Y + intPt.Y) / 2);
}
private bool DoLayout(Text text, Polygon polygon, LayoutOptions options)
{
// Initialize internal variables
_text = text;
_polygon = polygon;
_options = options;
_bounds = _polygon.Bounds;
_fits = false;
// Build the h-lines according to the layout settings
BuildLines();
// Find out the starting line and the total number
// of lines needed to layout the text.
_totalLines = 1;
_startLine = FirstLine(_totalLines);
if (GetHLines(_totalLines).Count == 0)
return false;
do
{
// Check if the text fits within the h-lines
// in the range [_startLine, _startLine + _totalLines)
int iword = 0;
PointList hLine = null;
for (int i = _startLine; i < _startLine + _totalLines; i++)
{
hLine = GetHLines(_totalLines)[i] as PointList;
for (int j = 0; j < hLine.Count; j += 2)
{
PointF pt1 = hLine[j];
PointF pt2 = hLine[j + 1];
RectangleF rc = new RectangleF(
pt1.X, pt1.Y, pt2.X - pt1.X, pt2.Y - pt1.Y);
bool newLine = false;
iword = FitTextInRect(iword, rc, ref newLine);
if (newLine)
break;
if (iword >= _text.Words.Count)
{
_fits = true;
return true;
}
}
}
// If the text does not fit, increase the total
// number of lines and recalculate the starting
// line depending on v-alignment.
_totalLines++;
if (_totalLines > GetHLines(_totalLines).Count)
{
_totalLines--;
return false;
}
_startLine = FirstLine(_totalLines);
ArrayList hLines = GetHLines(_totalLines);
if (_startLine + _totalLines > hLines.Count)
{
ArrayList hLines2 = GetHLines(_totalLines + 1);
if (_totalLines > hLines2.Count)
{
// The text would not fit in the
// polygon, so use all of the available
// space to layout as much text as possible
_totalLines = Math.Max(hLines.Count, hLines2.Count);
_startLine = 0;
return false;
}
}
}
while ((_startLine = FirstLine(_totalLines)) != -1);
return false;
}
internal override PointF getInitialPt()
{
PointF point = box.getCenter();
if (box.Style == BoxStyle.Shape && !box.containsPoint(point))
{
PointList points = box.getPolygon();
if (points != null && points.Count > 2)
{
Polygon poly = new Polygon(points);
return poly.GetInternalPoint();
}
}
return point;
}
