// NEED TO IMPLEMENT ROUNDING
private static PdfRectangle GetBoundingBoxOther(Letter letter)
{
// not very useful, need axis aligned bbox anyway
// -> rotate back? or normalise?
var points = new[]
{
letter.StartBaseLine,
letter.EndBaseLine,
letter.GlyphRectangle.TopLeft,
letter.GlyphRectangle.TopRight
};
// Candidates bounding boxes
var obb = GeometryExtensions.MinimumAreaRectangle(points);
var obb1 = new PdfRectangle(obb.BottomLeft, obb.TopLeft, obb.BottomRight, obb.TopRight);
var obb2 = new PdfRectangle(obb.BottomRight, obb.BottomLeft, obb.TopRight, obb.TopLeft);
var obb3 = new PdfRectangle(obb.TopRight, obb.BottomRight, obb.TopLeft, obb.BottomLeft);
// Find the orientation of the OBB, using the baseline angle
// Assumes line order is correct
var baseLineAngle = Distances.BoundAngle180(Distances.Angle(letter.GlyphRectangle.BottomLeft, letter.GlyphRectangle.BottomRight));
double deltaAngle = Math.Abs(Distances.BoundAngle180(obb.Rotation - baseLineAngle));
double deltaAngle1 = Math.Abs(Distances.BoundAngle180(obb1.Rotation - baseLineAngle));
if (deltaAngle1 < deltaAngle)
{
deltaAngle = deltaAngle1;
obb = obb1;
}
double deltaAngle2 = Math.Abs(Distances.BoundAngle180(obb2.Rotation - baseLineAngle));
if (deltaAngle2 < deltaAngle)
{
deltaAngle = deltaAngle2;
obb = obb2;
}
double deltaAngle3 = Math.Abs(Distances.BoundAngle180(obb3.Rotation - baseLineAngle));
if (deltaAngle3 < deltaAngle)
{
obb = obb3;
}
return(obb);
}
/// <summary>
/// Helper function to compute the within line angle between the pivot's bottom
/// right and the candidate's bottom left points, taking in account the pivot's rotation.
/// <para>-90 ≤ θ ≤ 90.</para>
/// </summary>
private static double AngleWL(Word pivot, Word candidate)
{
var angle = Distances.BoundAngle180(Distances.Angle(pivot.BoundingBox.BottomRight, candidate.BoundingBox.BottomLeft) - pivot.BoundingBox.Rotation);
// Angle is kept within [-90;90] degree to handle overlapping words
if (angle > 90)
{
angle -= 180;
}
else if (angle < -90)
{
angle += 180;
}
return(angle);
}
