public static UIImage ComposeButtonImage(UIImage thumbImage, float alpha = 1.0f)
{
// Get images and masks
var maskImage = thumbImage;
var invertedImage = thumbImage.Inverted();
var thumbnailImage = thumbImage;
if (invertedImage != null)
{
thumbnailImage = invertedImage;
}
// Compose a button image based on a white background and the inverted thumbnail image.
UIGraphics.BeginImageContextWithOptions(maskImage.Size, false, 0.0f);
var maskDrawRect = new CGRect(CGPoint.Empty, maskImage.Size);
var thumbDrawRect = new CGRect(CGPointExtensions.FromSize(maskImage.Size.Subtract(thumbImage.Size).Divide(2f)), thumbImage.Size);
maskImage.Draw(maskDrawRect, CGBlendMode.Normal, alpha);
thumbnailImage.Draw(thumbDrawRect, CGBlendMode.Normal, alpha);
var composedImage = UIGraphics.GetImageFromCurrentImageContext();
UIGraphics.EndImageContext();
// Return results
return(composedImage);
}
public void UpdateTranslation(VirtualObject virtualObject, CGPoint midpoint)
{
if (!TranslationThresholdPassed)
{
var initialLocationToCurrentLocation = midpoint.Subtract(InitialMidpoint);
var distanceFromStartLocation = initialLocationToCurrentLocation.Length();
// Check if the translate gesture has crossed the threshold.
// If the user is already rotating and or scaling we use a bigger threshold.
var threshold = TranslationThreshold;
if (RotationThresholdPassed || TranslationThresholdPassed)
{
threshold = TranslationThresholdHarder;
}
if (distanceFromStartLocation >= threshold)
{
TranslationThresholdPassed = true;
var currentObjectLocation = CGPointExtensions.FromVector(SceneView.ProjectPoint(virtualObject.Position));
DragOffset = midpoint.Subtract(currentObjectLocation);
}
}
if (TranslationThresholdPassed)
{
var offsetPos = midpoint.Subtract(DragOffset);
manager.Translate(virtualObject, SceneView, offsetPos, false, true);
LastUsedObject = virtualObject;
}
}
