Intersects the rectangles. If they intersect the intersection rectangle is returned. LMin is the empty rectangle / intersection and LMax is the infinite plane.

data RectEdge Source

Edge of a rectangle.

Constructors

E_Top
E_Bottom
E_Left
E_Right

data Limit a Source

Constructors

LMin
LValue a
LMax

Instances

Show a => Show (Limit a)

type PointMapFn x y = (Limit x, Limit y) -> Point Source

A function mapping between points.

Paths

data Path Source

The path type used by Charts.

A path can consist of several subpaths. Each is started by a MoveTo operation. All subpaths are open, except the last one, which may be closed using the Close operation. When filling a path all subpaths are closed implicitly.

Closing a subpath means that a line is drawn from the end point to the start point of the subpath.

If a Arc (or ArcNeg) is drawn a implicit line from the last end point of the subpath is drawn to the beginning of the arc. Another implicit line is drawn from the end of an arc to the beginning of the next path segment.

The beginning of a subpath is either (0,0) or set by a MoveTo instruction. If the first subpath is started with an arc the beginning of that subpath is the beginning of the arc.

Constructors

MoveTo Point Path
LineTo Point Path
Arc Point Double Double Double Path
ArcNeg Point Double Double Double Path
End
Close

Instances

Monoid Path

Paths are monoids. After a path is closed you can not append anything to it anymore. The empty path is open. Use close to close a path.

lineTo :: Point -> Path Source

Move the paths pointer to the given location and draw a straight line while doing so.

moveTo :: Point -> Path Source

Move the paths pointer to the given location.

lineTo' :: Double -> Double -> Path Source

Short-cut for lineTo, if you don't want to create a Point.

moveTo' :: Double -> Double -> Path Source

Short-cut for moveTo, if you don't want to create a Point.

arc Source

Arguments

:: Point	Center point of the circle arc.
-> Double	Radius of the circle.
-> Double	Angle to start drawing at, in radians.
-> Double	Angle to stop drawing at, in radians.
-> Path

Draw the arc of a circle. A straight line connects the end of the previous path with the beginning of the arc. The zero angle points in direction of the positive x-axis. Angles increase in clock-wise direction. If the stop angle is smaller then the start angle it is increased by multiples of 2 * pi until is is greater or equal.

arc' :: Double -> Double -> Double -> Double -> Double -> Path Source

Short-cut for arc, if you don't want to create a Point.

arcNeg :: Point -> Double -> Double -> Double -> Path Source

Like arc, but draws from the stop angle to the start angle instead of between them.

arcNeg' :: Double -> Double -> Double -> Double -> Double -> Path Source

Short-cut for arcNeg, if you don't want to create a Point.

close :: Path Source

A closed empty path. Closes a path when appended.

foldPath Source

Arguments

:: Monoid m
=> (Point -> m)	MoveTo
-> (Point -> m)	LineTo
-> (Point -> Double -> Double -> Double -> m)	Arc
-> (Point -> Double -> Double -> Double -> m)	ArcNeg
-> m	Close
-> Path	Path to fold
-> m

Fold the given path to a monoid structure.

makeLinesExplicit :: Path -> Path Source

Enriches the path with explicit instructions to draw lines, that otherwise would be implicit. See Path for details about what lines in paths are implicit.