/// <summary>
/// Calculates a rectangle around a screen location that depicts the touchable area which will count a path point as
/// hit if the user taps it
/// </summary>
/// <returns>The validation rect.</returns>
/// <param name="screenPoint">Screen point.</param>
/// <param name="validationRectSize">Validation rect size.</param>
internal static KSPictureLoginValidationRect GetValidationRect(this PointF screenPoint, SizeF validationRectSize)
{
float halfWidth = validationRectSize.Width / 2f;
float halfHeight = validationRectSize.Height / 2f;
var rect = new KSPictureLoginValidationRect(screenPoint.X - halfWidth, screenPoint.Y - halfHeight, validationRectSize.Width, validationRectSize.Height);
return rect;
}
public bool IntersectsWith(KSPictureLoginValidationRect otherRect)
{
return this.rect.IntersectsWith(otherRect.rect);
}
public override void TouchesMoved(NSSet touches, UIEvent evt)
{
base.TouchesMoved (touches, evt);
// If there isn't an active path gesture, create one now.
if(this.currentPathGesture == null)
{
this.currentPathGesture = this.Factory.CreateGesture<KSPictureLoginPathGesture> ();
this.currentPathGesture.Path.Add (this.touchStartLocation.NormalizePoint(this.PictureLoginView.DrawingAreaView.Bounds.Size));
}
UITouch touch = touches.AnyObject as UITouch;
var viewLocation = touch.LocationInView (this.PictureLoginView.DrawingAreaView);
// Don't allow drawing outside of the image.
viewLocation = viewLocation.LimitValues (this.PictureLoginView.DrawingAreaView.Bounds);
this.PictureLoginView.DrawingAreaView.SetGestureVisualizationLayerPosition (viewLocation);
this.PictureLoginView.DrawingAreaView.EnableGestureVisualizationLayer = true;
// We only store the point if it does not collide with the previous validation rectangle.
// This reduces the amount of points being stored.
var currentRasterizationRect = viewLocation.GetValidationRect (KSPictureLoginController.GridRectSize);
if (previousRasterizationRect == null || !currentRasterizationRect.IntersectsWith (this.previousRasterizationRect))
{
// The current rect is different from the previous validation rect. Store the center of the rect as a new location.
var normalizedPoint = currentRasterizationRect.Center.NormalizePoint (this.PictureLoginView.DrawingAreaView.Bounds.Size);
this.currentPathGesture.Path.Add (normalizedPoint);
this.PictureLoginView.DrawingAreaView.ContinuePathGesture (currentRasterizationRect.Center);
// Remember the current validation rect for the next iteration.
this.previousRasterizationRect = currentRasterizationRect;
// Update the view.
this.PictureLoginView.DrawingAreaView.SetNeedsDisplay();
}
}