Wumpus.Basic.Kernel.Base.Anchors

Anchor points on shapes, bounding boxes, etc.

Anchors are addressable positions, an examplary use is taking anchors on node shapes to get the start and end points for connectors in a network (graph) diagram.

Anchors

class CenterAnchor t where

Center of an object.

Methods

center :: DUnit t ~ u => t -> Point2 u

Instances

Fractional u => CenterAnchor (BoundingBox u)

class CardinalAnchor t where

Cardinal (compass) positions on an object.

Note - in TikZ cardinal anchors are not necessarily at the equivalent radial position, for instance reactangle north-east is the top-right corner whether or not this is incident at 45deg.

Wumpus generally follows the TikZ convention.

Methods

north :: DUnit t ~ u => t -> Point2 u

south :: DUnit t ~ u => t -> Point2 u

east :: DUnit t ~ u => t -> Point2 u

west :: DUnit t ~ u => t -> Point2 u

Instances

Fractional u => CardinalAnchor (BoundingBox u)

class CardinalAnchor2 t where

Secondary group of cardinal (compass) positions on an object.

It seems possible that for some objects defining the primary compass points (north, south,...) will be straight-forward whereas defining the secondary compass points may be problemmatic, hence the compass points are split into two classes.

Methods

northeast :: DUnit t ~ u => t -> Point2 u

southeast :: DUnit t ~ u => t -> Point2 u

southwest :: DUnit t ~ u => t -> Point2 u

northwest :: DUnit t ~ u => t -> Point2 u

Instances

Fractional u => CardinalAnchor2 (BoundingBox u)

class RadialAnchor t where

Anchor on a border that can be addressed by an angle.

The angle is counter-clockwise from the right-horizontal, i.e. 0 is east.

Methods

radialAnchor :: DUnit t ~ u => Radian -> t -> Point2 u

Extended anchor points

northwards :: (Real u, Floating u, CenterAnchor t, CardinalAnchor t, u ~ DUnit t) => u -> t -> Point2 u

northwards : dist * object -> Point

Project the anchor along a line from the center that goes through the north anchor.

If the distance is zero the answer with be the north anchor.

If the distance is negative the answer within the object before the north anchor.

If the distance is positive the anchor outside the object.

southwards :: (Real u, Floating u, CenterAnchor t, CardinalAnchor t, u ~ DUnit t) => u -> t -> Point2 u

southwards : dist * object -> Point

Variant of the function northwards, but projecting the line southwards from the center of the object.

eastwards :: (Real u, Floating u, CenterAnchor t, CardinalAnchor t, u ~ DUnit t) => u -> t -> Point2 u

eastwards : dist * object -> Point

Variant of the function northwards, but projecting the line eastwards from the center of the object.

westwards :: (Real u, Floating u, CenterAnchor t, CardinalAnchor t, u ~ DUnit t) => u -> t -> Point2 u

westwards : dist * object -> Point

Variant of the function northwards, but projecting the line westwards from the center of the object.

northeastwards :: (Real u, Floating u, CenterAnchor t, CardinalAnchor2 t, u ~ DUnit t) => u -> t -> Point2 u

northeastwards : dist * object -> Point

Variant of the function northwards, but projecting the line northeastwards from the center of the object.

southeastwards :: (Real u, Floating u, CenterAnchor t, CardinalAnchor2 t, u ~ DUnit t) => u -> t -> Point2 u

southeastwards : dist * object -> Point

Variant of the function northwards, but projecting the line southeastwards from the center of the object.

southwestwards :: (Real u, Floating u, CenterAnchor t, CardinalAnchor2 t, u ~ DUnit t) => u -> t -> Point2 u

southwestwards : dist * object -> Point

Variant of the function northwards, but projecting the line southwestwards from the center of the object.

northwestwards :: (Real u, Floating u, CenterAnchor t, CardinalAnchor2 t, u ~ DUnit t) => u -> t -> Point2 u

northwestwards : dist * object -> Point

Variant of the function northwards, but projecting the line northwestwards from the center of the object.

radialConnectorPoints :: (Real u, Floating u, CenterAnchor t1, RadialAnchor t1, CenterAnchor t2, RadialAnchor t2, u ~ DUnit t1, DUnit t1 ~ DUnit t2) => t1 -> t2 -> (Point2 u, Point2 u)

radialConnectorPoints : object_a * object_b -> (Point_a, Point_b)

Find the radial connectors points for objects a and b along the line joining their centers.