/// <summary>
/// Checks if two ink annotations are matched by comparing their colors and ink points.
/// </summary>
/// <param name="loadedInk">The ink annotation in the pdf file.</param>
/// <param name="appInk">The ink annotation constructed by the app.</param>
/// <returns>If the two annotations are matched, true. Otherwise false.</returns>
private bool MatchInkAnnotations(PdfLoadedInkAnnotation loadedInk, PdfInkAnnotation appInk)
{
// Color
if (loadedInk.Color.R != appInk.Color.R ||
loadedInk.Color.G != appInk.Color.G ||
loadedInk.Color.B != appInk.Color.B)
{
return(false);
}
// Points
List <float> points1 = loadedInk.InkList;
List <float> points2 = appInk.InkList;
if (points1.Count != points2.Count)
{
return(false);
}
for (int i = 0; i < points1.Count; i++)
{
double threshold = 0.5;
if (Math.Abs(points1[i] - points2[i]) > threshold)
{
return(false);
}
}
return(true);
}
/// <summary>
/// Converts an ink annotation (from the PDF file) to an ink stroke (to be displayed on the screen).
/// </summary>
/// <param name="inkAnnotation"></param>
/// <param name="mapping"></param>
/// <returns></returns>
public InkStroke InkAnnotation2InkStroke(PdfLoadedInkAnnotation inkAnnotation)
{
List <float> strokePoints = inkAnnotation.InkList;
InkStrokeBuilder builder = new InkStrokeBuilder();
List <Point> InkPoints = new List <Point>();
// Construct ink points
for (int i = 0; i < strokePoints.Count; i = i + 2)
{
if ((i + 1) >= strokePoints.Count)
{
// TODO: Something must be wrong.
break;
}
double X = 0, Y = 0;
float W = strokePoints[i];
float Z = strokePoints[i + 1];
switch (Rotation)
{
case 0: // No rotation
{
X = W;
Y = PageSize.Height - Z;
break;
}
case 1: // 90-degree rotation
{
X = Z;
Y = W;
break;
}
case 2: // 180-degree rotation
{
X = PageSize.Width - W;
Y = Z;
break;
}
case 3: // 270-degree rotation
{
X = PageSize.Width - Z;
Y = PageSize.Height - W;
break;
}
}
double pointX = (X - Offset.X) / ScaleRatio;
double pointY = (Y - Offset.Y) / ScaleRatio;
InkPoints.Add(new Point(pointX, pointY));
}
InkStroke stroke = builder.CreateStroke(InkPoints);
Windows.UI.Color color = ColorToUI(inkAnnotation.Color);
double width = inkAnnotation.BorderWidth;
if (width < InkingPreference.MIN_PEN_SIZE)
{
width = InkingPreference.MIN_PEN_SIZE;
}
width = width / ScaleRatio;
Size size = new Size(width, width);
if (inkAnnotation.Opacity == InkingManager.HighlighterOpacity)
{
stroke.DrawingAttributes = InkingManager.HighlighterDrawingAttributes(color, size);
}
else
{
stroke.DrawingAttributes = InkingManager.PencilDrawingAttributes(color, size);
}
return(stroke);
}
