|Maintainer||Stephen Tetley <email@example.com>|
Common core for shapes
- data Shape t u
- type DShape t = Shape t Double
- shapeMap :: (t u -> t' u) -> Shape t u -> Shape t' u
- makeShape :: InterpretUnit u => LocThetaQuery u (t u) -> LocThetaQuery u (AbsPath u) -> Shape t u
- strokedShape :: InterpretUnit u => Shape t u -> LocImage u (t u)
- dblStrokedShape :: InterpretUnit u => Shape t u -> LocImage u (t u)
- filledShape :: InterpretUnit u => Shape t u -> LocImage u (t u)
- borderedShape :: InterpretUnit u => Shape t u -> LocImage u (t u)
- rstrokedShape :: InterpretUnit u => Shape t u -> LocThetaImage u (t u)
- rfilledShape :: InterpretUnit u => Shape t u -> LocThetaImage u (t u)
- rborderedShape :: InterpretUnit u => Shape t u -> LocThetaImage u (t u)
- roundCornerShapePath :: (Real u, Floating u, InterpretUnit u, Tolerance u) => u -> [Point2 u] -> Query u (AbsPath u)
- updatePathAngle :: (Radian -> Radian) -> Shape t u -> Shape t u
- setDecoration :: LocThetaGraphic u -> Shape t u -> Shape t u
- data ShapeCTM u
- makeShapeCTM :: Point2 u -> Radian -> ShapeCTM u
- ctmCenter :: ShapeCTM u -> Point2 u
- ctmAngle :: ShapeCTM u -> Radian
- projectFromCtr :: (Real u, Floating u) => Vec2 u -> ShapeCTM u -> Anchor u
Shape is a record of three LocTheta functions - functions from Point and Angle to answer.
shape_path_fun returns a path. When the Shape is drawn,
the rendering function (
strokedShape, etc.) uses the path for
drawing and returns the polymorphic answer
a of the
shape_ans_fun. Lastly the
shape_decoration function can
instantiated to add decoration (e.g. text) to the Shape as it
a of the
shape_ans_fun represents some concrete shape
object (e.g. a Rectangle, Triangle etc.). Crucial for shape
objects is that they support Anchors - this allows connectors
to address specific locations on the Shape border so
"node and link" diagrams can be made easily.
Note - this is simplistic double stroking - draw a background line with triple thickness and draw a white line on top.
I think this is what TikZ does, but it works better for TikZ where the extra thickness seems to be accounted for by the anchors. For Wumpus, arrows cut into the outside black line.
Probably Wumpus should calculate two paths instead.
Draw the shape path with round corners.
The path angle can be modified. This allows inverse versions of shapes (e.g. InvTriangle) to be made by wrapping a base Shape but rotating the path prior to drawing it.
Only the Path needs rotating, the decoration takes the original angle. The anchors are typically implemented by rotating the correspoding anchor of the wrapped Shape about its center.