public static List<PointF> ParsePolygonString(String polygonString, String componentType, ICoordinateTransform coordinateTransformer)
{
List<PointF> returnList = new List<PointF>();
// left, center, right referring to ( , ) which wraps a point (1 , 2)
int searchFrom = 0;
while (searchFrom != -1 && polygonString.Length > 0)
{
int left = polygonString.IndexOf("(", searchFrom);
int center = polygonString.IndexOf(",", searchFrom);
int right = polygonString.IndexOf(")", searchFrom);
int leftPlusPlus = left + 1;
int centerPlusPlus = center + 1;
String xString = polygonString.Substring(leftPlusPlus, center - leftPlusPlus);
String yString = polygonString.Substring(centerPlusPlus, right - centerPlusPlus);
xString = xString.Replace("\r\n","").Trim();
yString = yString.Replace("\r\n","").Trim();
if (xString.Length > 0 && yString.Length > 0)
{
float xPoly = float.Parse(xString);
float yPoly = float.Parse(yString);
// use transform
xPoly = coordinateTransformer.RetrieveX(xPoly);
yPoly = coordinateTransformer.RetrieveY(yPoly);
returnList.Add(new PointF(xPoly, yPoly));
}
searchFrom = polygonString.IndexOf(",", right) + 1;
if (searchFrom == 0)
{
searchFrom = -1; // index returns 0 as failure, but we want 0 on the first iteration, so use -1
}
} // point load while
coordinateTransformer.PostProcessPolygon(returnList, componentType);
return returnList;
}