private static BaseLabel CreateLabel(FeatureDataRow fdr, IGeometry feature, string text, float rotation, int priority, LabelStyle style, MapViewport map, Graphics g, GetLocationMethod _getLocationMethod)
{
if (feature == null)
{
return(null);
}
BaseLabel lbl = null;
var font = style.GetFontForGraphics(g);
SizeF size = VectorRenderer.SizeOfString(g, text, font);
if (feature is ILineal)
{
var line = feature as ILineString;
if (line != null)
{
if (style.IsTextOnPath == false)
{
if (size.Width < 0.95 * line.Length / map.PixelWidth || style.IgnoreLength)
{
var positiveLineString = PositiveLineString(line, false);
var lineStringPath = LineStringToPath(positiveLineString, map /*, false*/);
var rect = lineStringPath.GetBounds();
if (style.CollisionDetection && !style.CollisionBuffer.IsEmpty)
{
var cbx = style.CollisionBuffer.Width;
var cby = style.CollisionBuffer.Height;
rect.Inflate(2 * cbx, 2 * cby);
rect.Offset(-cbx, -cby);
}
var labelBox = new LabelBox(rect);
lbl = new PathLabel(text, lineStringPath, 0, priority, labelBox, style);
}
}
else
{
//get centriod
System.Drawing.PointF position2 = map.WorldToImage(feature.EnvelopeInternal.Centre);
lbl = new Label(text, position2, rotation, priority, style);
if (size.Width < 0.95 * line.Length / map.PixelWidth || !style.IgnoreLength)
{
CalculateLabelAroundOnLineString(line, ref lbl, map, g, size);
}
}
}
return(lbl);
}
var worldPosition = _getLocationMethod == null
? feature.EnvelopeInternal.Centre
: _getLocationMethod(fdr);
if (worldPosition == null)
{
return(null);
}
var position = map.WorldToImage(worldPosition);
var location = new PointF(
position.X - size.Width * (short)style.HorizontalAlignment * 0.5f,
position.Y - size.Height * (short)(2 - (int)style.VerticalAlignment) * 0.5f);
if (location.X - size.Width > map.Size.Width || location.X + size.Width < 0 ||
location.Y - size.Height > map.Size.Height || location.Y + size.Height < 0)
{
return(null);
}
if (!style.CollisionDetection)
{
lbl = new Label(text, location, rotation, priority, null, style)
{
LabelPoint = position
}
}
;
else
{
//Collision detection is enabled so we need to measure the size of the string
lbl = new Label(text, location, rotation, priority,
new LabelBox(location.X - style.CollisionBuffer.Width,
location.Y - style.CollisionBuffer.Height,
size.Width + 2f * style.CollisionBuffer.Width,
size.Height + 2f * style.CollisionBuffer.Height), style)
{
LabelPoint = position
};
}
/*
* if (feature is LineString)
* {
* var line = feature as LineString;
*
* //Only label feature if it is long enough, or it is definately wanted
* if (line.Length / map.PixelSize > size.Width || style.IgnoreLength)
* {
* CalculateLabelOnLinestring(line, ref lbl, map);
* }
* else
* return null;
* }
*/
return(lbl);
}
private static BaseLabel CreateLabelDefinition(FeatureDataRow fdr, IGeometry geom, string text, float rotation,
int priority, LabelStyle style, MapViewport map, Graphics g, GetLocationMethod getLocationMethod)
{
//ONLY atomic geometries
Debug.Assert(!(geom is IGeometryCollection));
if (geom == null)
{
return(null);
}
BaseLabel lbl;
var font = style.GetFontForGraphics(g);
var size = VectorRenderer.SizeOfString(g, text, font);
if (geom is ILineString ls)
{
return(CreatePathLabel(ls, text, size, priority, style, map));
}
var worldPosition = getLocationMethod == null
? geom.EnvelopeInternal.Centre
: getLocationMethod(fdr);
if (worldPosition == null)
{
return(null);
}
var position = map.WorldToImage(worldPosition);
var location = new PointF(
position.X - size.Width * (short)style.HorizontalAlignment * 0.5f,
position.Y - size.Height * (short)(2 - (int)style.VerticalAlignment) * 0.5f);
if (location.X - size.Width > map.Size.Width || location.X + size.Width < 0 ||
location.Y - size.Height > map.Size.Height || location.Y + size.Height < 0)
{
return(null);
}
if (!style.CollisionDetection)
{
lbl = new Label(text, location, rotation, priority, null, style)
{
LabelPoint = position
}
}
;
else
{
//Collision detection is enabled so we need to measure the size of the string
lbl = new Label(text, location, rotation, priority,
new LabelBox(location.X - style.CollisionBuffer.Width,
location.Y - style.CollisionBuffer.Height,
size.Width + 2f * style.CollisionBuffer.Width,
size.Height + 2f * style.CollisionBuffer.Height), style)
{
LabelPoint = position
};
}
return(lbl);
}
