/// <summary>
/// Applies Affine transformation to point
/// </summary>
/// <param name="point"></param>
/// <param name="transormationMatrix"></param>
/// <returns></returns>
private Point Transform(Point point, Matrix transormationMatrix)
{
var transformMatrix = new AffineTransform(transormationMatrix[Matrix.I11], transormationMatrix[Matrix.I12],
transormationMatrix[Matrix.I21], transormationMatrix[Matrix.I22],
transormationMatrix[Matrix.I31], transormationMatrix[Matrix.I32]);
var dst = new Point2D.Float();
transformMatrix.Transform(new Point2D.Float(point.X, point.Y), dst);
if (_pageRotation == 0)
{
return(new Point(dst.x, _pageHeight - dst.y));
}
if (_pageRotation == 90)
{
return(new Point(dst.x, dst.y));
}
throw new Exception("Current page rotation is not handled");
}
//TODO: Add logic to analyze lines as delimeters
/// <summary>
/// Tries to construct a rectangle from current points
/// </summary>
/// <param name="ctm"></param>
private void ConstructShape(Matrix ctm)
{
if (_currentPoints.Count > 0)
{
if (((_currentPoints.Count == 5) && _currentPoints[0].IsEqual(_currentPoints[4])) ||
(_currentPoints.Count == 4))
{
var point = new Point[3];
point[0] = Transform(_currentPoints[0], ctm);
point[1] = Transform(_currentPoints[1], ctm);
point[2] = Transform(_currentPoints[2], ctm);
var maxY = point.Max(x => x.Y);
var minY = point.Min(x => x.Y);
var maxX = point.Max(x => x.X);
var minX = point.Min(x => x.X);
_rectangles.Add(new Rectangle
{
X = minX,
Y = maxY,
Height = maxY - minY,
Width = maxX - minX
});
return;
}
}
if (_currentPoints.Count == 0)
{
return;
}
var points =
_currentPoints.Select(currentPoint => Transform(currentPoint, ctm))
.DistinctBy(p => new { p.X, p.Y })
.ToList();
//we have a rectangle
if (points.Count == 4)
{
var sortedPoints = points.OrderBy(x => x.X).ThenByDescending(x => x.Y).ToList();
_rectangles.Add(new Rectangle
{
X = sortedPoints[1].X,
Y = sortedPoints[1].Y,
Height = Math.Abs(sortedPoints[1].Y - sortedPoints[0].Y),
Width = sortedPoints[2].X - sortedPoints[0].X
});
return;
}
if (_currentPoints.Count == 2)
{
var beginPoint = Transform(_currentPoints[0], ctm);
var endPoint = Transform(_currentPoints[1], ctm);
_lines.Add(new Line(beginPoint, endPoint));
}
}