public DiamondShapeInfo <TCell> FatRectangle(int width, int height)
{
int diamondSize = width + GLMathf.FloorDiv(height, 2);
var storageBottomLeft = new DiamondPoint(0, 1 - width);
return(Shape(diamondSize, diamondSize, p => IsInsideFatRectangle(p, width, height), storageBottomLeft));
}
/// <summary>
/// Gives a new point that represents the
/// first point multiplied by the second point
/// component-wise.
///
/// Since version 1.6 (Rect)
/// Since version 1.7 (other)
/// </summary>
public DiamondPoint Mul(DiamondPoint otherPoint)
{
var x = X * otherPoint.X;
var y = Y * otherPoint.Y;
return(new DiamondPoint(x, y));
}
/// <summary>
/// Gives a new point that represents the
/// first point divided by the second point
/// component-wise. The division is integer
/// division.
///
/// Since version 1.6 (Rect)
/// Since version 1.7 (other)
/// </summary>
public DiamondPoint Div(DiamondPoint otherPoint)
{
var x = GLMathf.FloorDiv(X, otherPoint.X);
var y = GLMathf.FloorDiv(Y, otherPoint.Y);
return(new DiamondPoint(x, y));
}
public IEnumerable <DiamondPoint> GetSpiralIterator(DiamondPoint origin, int ringCount)
{
var point = origin;
if (Contains(point))
{
yield return(point);
}
for (var k = 1; k < ringCount; k++)
{
point += DiamondPoint.North;
for (var i = 0; i < 4; i++)
{
for (var j = 0; j < 2 * k; j++)
{
point += SpiralIteratorDirections[i];
if (Contains(point))
{
yield return(point);
}
}
}
}
}
private static bool IsInsideParallelogram(DiamondPoint point, int width, int height)
{
return
(point.X >= 0 &&
point.X < width &&
point.Y >= 0 &&
point.Y < height);
}
public IEnumerable <DiamondPoint> GetEdges()
{
DiamondPoint edgeAnchor = GetEdgeAnchor();
return
(from edgeDirection in EdgeDirections
select edgeDirection + edgeAnchor);
}
public DiamondShapeInfo <TCell> Rectangle(int width, int height)
{
//Note: this fit is not the tightest possible.
int diamondSize = width + GLMathf.FloorDiv(height, 2);
var storageBottomLeft = new DiamondPoint(0, 1 - width);
return(Shape(diamondSize, diamondSize, p => IsInsideRaggedRectangle(p, width, height), storageBottomLeft));
}
public static bool DefaultContains(DiamondPoint point, int width, int height)
{
ArrayPoint storagePoint = ArrayPointFromGridPoint(point);
return
(storagePoint.X >= 0 &&
storagePoint.X < width &&
storagePoint.Y >= 0 &&
storagePoint.Y < height);
}
private static bool IsInsideThinRectangle(DiamondPoint point, int width, int height)
{
int x = GLMathf.FloorDiv(point.X - point.Y, 2);
int y = point.X + point.Y;
return
(x >= 0 &&
x < width - GLMathf.FloorMod(y, 2) &&
y >= 0 &&
y < height);
}
/// <summary>
/// Gives a coloring of the grid such that
/// if a point p has color k, then all points
/// p + m[ux, 0] + n[vx, vy] have the same color
/// for any integers a and b.
///
/// More information anout grid colorings:
/// http://gamelogic.co.za/2013/12/18/what-are-grid-colorings/
///
/// Since version 1.7
/// </summary>
public int __GetColor__ReferenceImplementation(int ux, int vx, int vy)
{
var u = new DiamondPoint(ux, 0);
var v = new DiamondPoint(vx, vy);
int colorCount = u.PerpDot(v);
float a = PerpDot(v) / (float)colorCount;
float b = -PerpDot(u) / (float)colorCount;
int m = Mathf.FloorToInt(a);
int n = Mathf.FloorToInt(b);
int baseVectorX = m * u.X + n * v.X;
int baseVectorY = n * u.Y + n * v.Y;
int offsetX = GLMathf.FloorMod(X - baseVectorX, ux);
int offsetY = Y - baseVectorY;
int colorIndex = Mathf.FloorToInt(offsetX + offsetY * ux);
return(colorIndex);
}
public DiamondPoint MoveBy(DiamondPoint translation)
{
return(Translate(translation));
}
/**
* Use this function to create shapes to ensure they fit into memory.
*
* The test function can test shapes anywhere in space. If you specify the bottom corner
* (in terms of the storage rectangle), the shape is automatically translated in memory
* to fit, assuming memory width and height is big enough.
*
* Strategy for implementing new shapes:
* - First, determine the test function.
* - Next, draw a storage rectangle that contains the shape.
* - Determine the storgae rectangle width and height.
* - Finally, determine the grid-space coordinate of the left bottom corner of the storage rectangle.
*
* Then define your function as follows:
*
* \code{cs}
* public DiamondShapeInfo<TCell> MyShape()
* {
* Shape(stargeRectangleWidth, storageRectangleHeight, isInsideMyShape, storageRectangleBottomleft);
* }
* \endcode
*
* \param width The widh of the storage rectangle
* \param height The height of the storage rectangle
* \param isInside A function that returns true if a passed point lies inside the shape being defined
* \param bottomLeftCorner The grid-space coordinate of the bottom left corner of the storage rect.
*
*/
public DiamondShapeInfo <TCell> Shape(int width, int height, Func <DiamondPoint, bool> isInside, DiamondPoint bottomLeftCorner)
{
var shapeInfo = MakeShapeStorageInfo <DiamondPoint>(width, height, x => isInside(x + bottomLeftCorner));
return(new DiamondShapeInfo <TCell>(shapeInfo).Translate(bottomLeftCorner));
}
public InspectableVectorPoint(DiamondPoint point)
{
x = point.X;
y = point.Y;
}
/**
* A test function that returns true if the point for which the given
* vertexPoint is a vertex, is inside this grid.
*/
private bool IsInsideVertexGrid(DiamondPoint vertexPoint)
{
var faces = (vertexPoint as IVertex <DiamondPoint>).GetVertexFaces();
return(faces.Any(Contains));
}
protected override DiamondGrid <TCell> MakeShape(int x, int y, Func <DiamondPoint, bool> isInside, DiamondPoint offset)
{
return(new DiamondGrid <TCell>(x, y, isInside, offset));
}
public static ArrayPoint ArrayPointFromGridPoint(DiamondPoint point)
{
return(new ArrayPoint(point.X, point.Y));
}
/**
* Construct a new grid whose cells are determined by the given test function.
*
* The function should only return true for points within the bounds of the rectangle when
* the given transforms are applied to them.
*
* Normally, the static factory methods or shape building methods should be used to create grids.
* These constructors are provided for advanced usage.
*
* @link_constructing_grids
*/
public DiamondGrid(int width, int height, Func <DiamondPoint, bool> isInside, DiamondPoint offset) :
this(width, height, isInside, x => x.MoveBy(offset), x => x.MoveBackBy(offset), DiamondPoint.MainDirections)
{
}
/// <summary>
/// Subtracts the other point from this point, and returns the result.
/// </summary>
public DiamondPoint Subtract(DiamondPoint other)
{
return(new DiamondPoint(x - other.X, y - other.Y));
}
/// <summary>
/// This is a norm defined on the point, such that `p1.Difference(p2).Abs()` is equal to
/// `p1.DistanceFrom(p2)`.
/// </summary>
public DiamondPoint Translate(DiamondPoint translation)
{
return(new DiamondPoint(x + translation.X, y + translation.Y));
}
public bool Equals(DiamondPoint other)
{
bool areEqual = (x == other.X) && (y == other.Y);
return(areEqual);
}
/// <summary>
/// The lattice distance from this point to the other.
/// </summary>
public int DistanceFrom(DiamondPoint other)
{
return(Subtract(other).Magnitude());
}
protected override ArrayPoint ArrayPointFromGridPoint(DiamondPoint point)
{
return(DiamondGrid <TCell> .ArrayPointFromGridPoint(point));
}
public DiamondPoint MoveBackBy(DiamondPoint translation)
{
return(Translate(translation.Negate()));
}
protected override ArrayPoint ArrayPointFromPoint(DiamondPoint point)
{
return(ArrayPointFromGridPoint(point));
}
public int Dot(DiamondPoint other)
{
return(x * other.X + y * other.Y);
}
public int PerpDot(DiamondPoint other)
{
return(x * other.Y - y * other.x);
}
/**
* A test function that returns true if the point for which the given
* vertexPoint is a vertex, is inside this grid.
*/
private bool IsInsideEdgeGrid(DiamondPoint edgePoint)
{
var faces = (edgePoint as IEdge <RectPoint>).GetEdgeFaces();
return(faces.Any(Contains));
}