public CGRect AddPointOfType(PointType pointType, UITouch touch)
{
var previousPoint = Points.LastOrDefault ();
var previousSequenceNumber = previousPoint != null ? previousPoint.SequenceNumber : -1;
var point = new LinePoint (touch, previousSequenceNumber + 1, pointType);
if (point.EstimationUpdateIndex != null && point.EstimatedPropertiesExpectingUpdates != 0)
pointsWaitingForUpdatesByEstimationIndex [point.EstimationUpdateIndex] = point;
Points.Add (point);
return UpdateRectForLinePoint (point, previousPoint);
}
public CGRect AddPointAtLocation (CGPoint location, CGPoint preciseLocation, nfloat force, double timestamp, PointType type)
{
var point = new LinePoint (timestamp, force, location, preciseLocation, type);
var updateRect = UpdateRectForLinePoint (point);
var last = points.LastOrDefault ();
if (last != null) {
var lastRect = UpdateRectForLinePoint (last);
updateRect.UnionWith (lastRect);
}
points.Add (point);
return updateRect;
}
static CGRect UpdateRectForLinePoint (LinePoint point)
{
var rect = new CGRect (point.Location, CGSize.Empty);
// The negative magnitude ensures an outset rectangle
var magnitude = -3 * point.Magnitude - 2;
rect = rect.Inset (magnitude, magnitude);
return rect;
}
static CGRect UpdateRectForLinePoint(LinePoint point, LinePoint previousPoint)
{
var rect = new CGRect (point.Location, CGSize.Empty);
var pointMagnitude = point.Magnitude;
if (previousPoint != null) {
pointMagnitude = NMath.Max (pointMagnitude, previousPoint.Magnitude);
rect = rect.UnionWith (new CGRect (previousPoint.Location, CGSize.Empty));
}
// The negative magnitude ensures an outset rectangle.
var magnitude = -3 * pointMagnitude - 2;
rect = rect.Inset (magnitude, magnitude);
return rect;
}
public void DrawInContext(CGContext context, bool isDebuggingEnabled, bool usePreciseLocation)
{
LinePoint maybePriorPoint = null;
foreach (var point in points)
{
if (maybePriorPoint == null)
{
maybePriorPoint = point;
continue;
}
var priorPoint = maybePriorPoint;
var color = UIColor.Black;
if (isDebuggingEnabled)
{
if (point.Properties.Contains(PointType.Cancelled))
{
color = UIColor.Red;
}
else if (point.Properties.Contains(PointType.NeedsUpdate))
{
color = UIColor.Orange;
}
else if (point.Properties.Contains(PointType.Finger))
{
color = UIColor.Purple;
}
else if (point.Properties.Contains(PointType.Coalesced))
{
color = UIColor.Green;
}
else if (point.Properties.Contains(PointType.Predicted))
{
color = UIColor.Blue;
}
}
else
{
if (point.Properties.Contains(PointType.Cancelled))
{
color = UIColor.Clear;
}
else if (point.Properties.Contains(PointType.Finger))
{
color = UIColor.Purple;
}
if (point.Properties.Contains(PointType.Predicted) && !point.Properties.Contains(PointType.Cancelled))
{
color = color.ColorWithAlpha(0.5f);
}
}
var location = usePreciseLocation ? point.PreciseLocation : point.Location;
var priorLocation = usePreciseLocation ? priorPoint.PreciseLocation : priorPoint.Location;
context.SetStrokeColor(color.CGColor);
context.BeginPath();
context.MoveTo(priorLocation.X, priorLocation.Y);
context.AddLineToPoint(location.X, location.Y);
context.SetLineWidth(point.Magnitude);
context.StrokePath();
maybePriorPoint = point;
}
}