private static MaskF Transform(MaskF mask, Matrix3x2 transformation)
{
var original = mask.UnderlayingArray;
var transformedPoints = new Vector2[original.Length];
// Initializing the transformed bounds
double sumX = 0;
double sumY = 0;
var first = Vector2.Transform(original[0], transformation);
float left = first.X;
float top = first.Y;
float right = first.X;
float bottom = first.Y;
// Calculating the transformed coordinates
for (int i = 0; i < original.Length; i++)
{
var pt = Vector2.Transform(original[i], transformation);
sumX += pt.X;
sumY += pt.Y;
UpdateBoundaries(pt, ref left, ref top, ref right, ref bottom);
transformedPoints[i] = pt;
}
Vector2 transformedCenter = new Vector2((float)(sumX / original.Length),
(float)(sumY / original.Length));
MaskF transformedMask = FromArrayAndProperties(transformedPoints, transformedCenter, left, top, right, bottom);
return transformedMask;
}
// public enum CoordinateColisionOption { AllowCollisions, AssignToEmptyNeighbor }
public static Mask ConvertToMask(MaskF mask)
{
if (mask == null)
throw new ArgumentNullException(nameof(mask));
var original = mask.UnderlayingArray;
var usedPoints = new HashSet<Point>();
for (int i = 0; i < original.Length; i++)
{
var convertedPoint = original[i].ToPoint();
if (!usedPoints.Add(convertedPoint))
{
// Testing the 8 closest coordinates
int x = convertedPoint.X;
int y = convertedPoint.Y;
if (usedPoints.Add(new Point(x - 1, y - 1)) ||
usedPoints.Add(new Point(x - 1, y)) ||
usedPoints.Add(new Point(x - 1, y + 1)) ||
usedPoints.Add(new Point(x, y - 1)) ||
usedPoints.Add(new Point(x, y + 1)) ||
usedPoints.Add(new Point(x + 1, y - 1)) ||
usedPoints.Add(new Point(x + 1, y)) ||
usedPoints.Add(new Point(x + 1, y + 1))
)
continue;
}
}
var convertedMask = new Mask(usedPoints);
return convertedMask;
}
public static MaskF Translate(MaskF mask, float xOffset, float yOffset)
{
if (mask == null)
throw new ArgumentNullException(nameof(mask));
var translation = Matrix3x2.CreateTranslation(xOffset, yOffset);
return Transform(mask, translation);
}
/// <remarks>The rotation is clockwise.</remarks>
public static MaskF Rotate(MaskF mask, float radians, Vector2 center)
{
if (mask == null)
throw new ArgumentNullException(nameof(mask));
var rotation = Matrix3x2.CreateRotation(radians, center);
return Transform(mask, rotation);
}
