| Copyright | (c) 2013 diagrams-lib team (see LICENSE) |
|---|---|
| License | BSD-style (see LICENSE) |
| Maintainer | diagrams-discuss@googlegroups.com |
| Safe Haskell | None |
| Language | Haskell2010 |
Diagrams.Trace
Description
"Traces", aka embedded raytracers, for finding points on the edge of a diagram. See Diagrams.Core.Trace for internal implementation details.
Synopsis
- data Trace (v :: Type -> Type) n
- class (Additive (V a), Ord (N a)) => Traced a
- trace :: (Metric v, OrderedField n, Semigroup m) => Lens' (QDiagram b v n m) (Trace v n)
- setTrace :: (OrderedField n, Metric v, Semigroup m) => Trace v n -> QDiagram b v n m -> QDiagram b v n m
- withTrace :: (InSpace v n a, Metric v, OrderedField n, Monoid' m, Traced a) => a -> QDiagram b v n m -> QDiagram b v n m
- traceV :: (n ~ N a, Num n, Traced a) => Point (V a) n -> V a n -> a -> Maybe (V a n)
- traceP :: (n ~ N a, Traced a, Num n) => Point (V a) n -> V a n -> a -> Maybe (Point (V a) n)
- maxTraceV :: (n ~ N a, Num n, Traced a) => Point (V a) n -> V a n -> a -> Maybe (V a n)
- maxTraceP :: (n ~ N a, Num n, Traced a) => Point (V a) n -> V a n -> a -> Maybe (Point (V a) n)
- boundaryFrom :: (OrderedField n, Metric v, Semigroup m) => Subdiagram b v n m -> v n -> Point v n
- boundaryFromMay :: (Metric v, OrderedField n, Semigroup m) => Subdiagram b v n m -> v n -> Maybe (Point v n)
Types
data Trace (v :: Type -> Type) n #
Every diagram comes equipped with a trace. Intuitively, the trace for a diagram is like a raytracer: given a line (represented as a base point and a direction vector), the trace computes a sorted list of signed distances from the base point to all intersections of the line with the boundary of the diagram.
Note that the outputs are not absolute distances, but multipliers
relative to the input vector. That is, if the base point is p
and direction vector is v, and one of the output scalars is
s, then there is an intersection at the point p .+^ (s *^ v).
Instances
| Show (Trace v n) | |
| Ord n => Semigroup (Trace v n) | Traces form a semigroup with pointwise minimum as composition.
Hence, if |
| Ord n => Monoid (Trace v n) | |
| (Additive v, Ord n) => Traced (Trace v n) | |
| (Additive v, Num n) => Transformable (Trace v n) | |
Defined in Diagrams.Core.Trace | |
| (Additive v, Num n) => HasOrigin (Trace v n) | |
Defined in Diagrams.Core.Trace | |
| Wrapped (Trace v n) | |
| (Metric v, OrderedField n) => Alignable (Trace v n) # | |
Defined in Diagrams.Align Methods alignBy' :: (InSpace v0 n0 (Trace v n), Fractional n0, HasOrigin (Trace v n)) => (v0 n0 -> Trace v n -> Point v0 n0) -> v0 n0 -> n0 -> Trace v n -> Trace v n # defaultBoundary :: (V (Trace v n) ~ v0, N (Trace v n) ~ n0) => v0 n0 -> Trace v n -> Point v0 n0 # alignBy :: (InSpace v0 n0 (Trace v n), Fractional n0, HasOrigin (Trace v n)) => v0 n0 -> n0 -> Trace v n -> Trace v n # | |
| Rewrapped (Trace v n) (Trace v' n') | |
Defined in Diagrams.Core.Trace | |
| type V (Trace v n) | |
Defined in Diagrams.Core.Trace | |
| type N (Trace v n) | |
Defined in Diagrams.Core.Trace | |
| type Unwrapped (Trace v n) | |
Defined in Diagrams.Core.Trace | |
class (Additive (V a), Ord (N a)) => Traced a #
Traced abstracts over things which have a trace.
Minimal complete definition
Instances
| Traced b => Traced [b] | |
| Traced b => Traced (Set b) | |
| Traced t => Traced (TransInv t) | |
| (RealFloat n, Ord n) => Traced (CSG n) # | |
| (RealFloat n, Ord n) => Traced (Frustum n) # | |
| (Fractional n, Ord n) => Traced (Box n) # | |
| OrderedField n => Traced (Ellipsoid n) # | |
| (Traced a, Num (N a)) => Traced (Located a) # | The trace of a |
| (Traced a, Traced b, SameSpace a b) => Traced (a, b) | |
| Traced b => Traced (Map k b) | |
| (Additive v, Ord n) => Traced (Trace v n) | |
| (Additive v, Ord n) => Traced (Point v n) | The trace of a single point is the empty trace, i.e. the one which returns no intersection points for every query. Arguably it should return a single finite distance for vectors aimed directly at the given point, but due to floating-point inaccuracy this is problematic. Note that the envelope for a single point is not the empty envelope (see Diagrams.Core.Envelope). |
| OrderedField n => Traced (FixedSegment V2 n) # | |
Defined in Diagrams.TwoD.Segment Methods getTrace :: FixedSegment V2 n -> Trace (V (FixedSegment V2 n)) (N (FixedSegment V2 n)) # | |
| RealFloat n => Traced (Trail V2 n) # | |
| RealFloat n => Traced (Path V2 n) # | |
| TypeableFloat n => Traced (BoundingBox V3 n) # | |
Defined in Diagrams.BoundingBox Methods getTrace :: BoundingBox V3 n -> Trace (V (BoundingBox V3 n)) (N (BoundingBox V3 n)) # | |
| RealFloat n => Traced (BoundingBox V2 n) # | |
Defined in Diagrams.BoundingBox Methods getTrace :: BoundingBox V2 n -> Trace (V (BoundingBox V2 n)) (N (BoundingBox V2 n)) # | |
| OrderedField n => Traced (Segment Closed V2 n) # | |
| (Metric v, OrderedField n, Semigroup m) => Traced (QDiagram b v n m) | |
| (OrderedField n, Metric v, Semigroup m) => Traced (Subdiagram b v n m) | |
Defined in Diagrams.Core.Types Methods getTrace :: Subdiagram b v n m -> Trace (V (Subdiagram b v n m)) (N (Subdiagram b v n m)) # | |
Diagram traces
setTrace :: (OrderedField n, Metric v, Semigroup m) => Trace v n -> QDiagram b v n m -> QDiagram b v n m #
Replace the trace of a diagram.
withTrace :: (InSpace v n a, Metric v, OrderedField n, Monoid' m, Traced a) => a -> QDiagram b v n m -> QDiagram b v n m #
Use the trace from some object as the trace for a diagram, in place of the diagram's default trace.
Querying traces
traceV :: (n ~ N a, Num n, Traced a) => Point (V a) n -> V a n -> a -> Maybe (V a n) #
Compute the vector from the given point p to the "smallest"
boundary intersection along the given vector v. The
"smallest" boundary intersection is defined as the one given by
p .+^ (s *^ v) for the smallest (most negative) value of
s. Return Nothing if there is no intersection. See also
traceP.
See also rayTraceV which uses the smallest positive
intersection, which is often more intuitive behavior.
traceP :: (n ~ N a, Traced a, Num n) => Point (V a) n -> V a n -> a -> Maybe (Point (V a) n) #
Compute the "smallest" boundary point along the line determined
by the given point p and vector v. The "smallest" boundary
point is defined as the one given by p .+^ (s *^ v) for
the smallest (most negative) value of s. Return Nothing if
there is no such boundary point. See also traceV.
See also rayTraceP which uses the smallest positive
intersection, which is often more intuitive behavior.
maxTraceV :: (n ~ N a, Num n, Traced a) => Point (V a) n -> V a n -> a -> Maybe (V a n) #
Like traceV, but computes a vector to the "largest" boundary
point instead of the smallest. (Note, however, the "largest"
boundary point may still be in the opposite direction from the
given vector, if all the boundary points are, as in the third
example shown below.)
maxTraceP :: (n ~ N a, Num n, Traced a) => Point (V a) n -> V a n -> a -> Maybe (Point (V a) n) #
Like traceP, but computes the "largest" boundary point
instead of the smallest. (Note, however, the "largest" boundary
point may still be in the opposite direction from the given
vector, if all the boundary points are.)
Subdiagram traces
boundaryFrom :: (OrderedField n, Metric v, Semigroup m) => Subdiagram b v n m -> v n -> Point v n #
Compute the furthest point on the boundary of a subdiagram,
beginning from the location (local origin) of the subdiagram and
moving in the direction of the given vector. If there is no such
point, the origin is returned; see also boundaryFromMay.
boundaryFromMay :: (Metric v, OrderedField n, Semigroup m) => Subdiagram b v n m -> v n -> Maybe (Point v n) #
Compute the furthest point on the boundary of a subdiagram,
beginning from the location (local origin) of the subdiagram and
moving in the direction of the given vector, or Nothing if
there is no such point.