A graphics port.

A path specification.

A real number.

A real number.

A boolean.

A boolean.

One of the keywords `:even-odd`

and `:winding`

.

graphics-state parameters passed as keyword arguments.

The function `draw-path`

draws the path `
path`
at (`
x`
`
y`
) in `
port`
.

When `
closed`
is non-nil, a line is drawn from the last point in the path to the start of the last figure in the path. When `
filled`
is non-nil, the path is filled, otherwise its outline is drawn; the `
closed`
argument is ignored if `
filled`
is non-nil. `
transform`
, `
foreground`
, `
background`
, `
thickness`
, `
scale-thickness`
, `
dashed`
, `
dash`
, `
line-end-style`
, `
line-joint-style`
and `
mask`
from `
port`
's graphics state (see graphics-state) are all used. `
fill-rule`
specifies how overlapping regions are filled. Possible values for `
fill-rule`
are `:even-odd`

and `:winding`

.

`
path`
is a path specification, which consists of path elements that describe a number of disconnected figures. The origin of the path is (`
x`
`
y`
), so all other coordinates within the path are translated relative to that point.

The following formats of path specification are supported:

- A sequence of lists, each of which is a path element as described below.
- A function designator to generate the path elements. Graphics ports calls the function when it wants to obtain the path elements. The function takes a single argument, which is a function that should be called with each path elements as its arguments.

The following path elements can be used:

Closes the current figure by adding a straight line from the current point to the start point.

Closes the current figure and starts a new one at (`
x`
`
y`
).

Adds a straight line to the current figure, from the current point to (`
x`
`
y`
) and makes (`
x`
`
y`
) be the current point.

`:arc `

`
x`
` `

`
y`
` `

`
width`
` `

`
height`
` `

`
start-angle`
` `

`
sweep`
` &optional `

`
movep`

Adds an elliptical arc to the current figure, contained in the rectangle from (`
x`
`
y`
) to (`
x+width`
`
y+width`
) from `
start-angle`
to `
start-angle+sweep-angle`
. Both angles are specified in radians and positive values mean anticlockwise. If `
movep`
is `nil`

(the default), then a straight line is also added from the current point to the start of the arc, otherwise a new figure is started from the start of the arc. The end of the arc becomes the new current point.

Adds a cubic Bézier curve to the current figure, from the current point to (`
x`
`
y`
) using control points (`
cx1`
`
cy1`
) and (`
cx2`
`
cy2`
).

Adds a self contained figure, a rectangle from (`
x`
`
y`
) to (`
x+width`
`
y+width`
).

`:ellipse `

`
x`
` `

`
y`
` `

`
x-radius`
` `

`
y-radius`

Adds a self contained figure, an ellipse of the given radii centered on (`
x`
`
y`
).

Adds the path elements `
elements`
, scaling them by `
sx`
and `
sy`
.

Adds the path elements `
elements`
, rotating them `
theta`
radians about the origin. If `
theta`
is positive, then the rotation is clockwise.

Adds the path elements `
elements`
, translating them by `
dx`
and `
dy`
.

Adds the path elements `
elements`
, transformed by `
transform`
.

Draws two lines from (40 30) to (140 30) and from (140 30) to (140 130):

```
(draw-path port '((:line 100 0) (:line 100 100)) 40 30)
```

Draws an outline triangle with vertices (40 30), (140 30) and (140 130):

(draw-path port '((:line 100 0) (:line 100 100))

40 30 :closed t)

Draws a filled triangle with vertices (40 30), (140 30) and (140 130):

(draw-path port '((:line 100 0) (:line 100 100))

40 30 :filled t)

Draws a filled triangle exactly as in the previous example but using a function to generate the path elements:

(flet ((generate (fn)

(funcall fn :line 100 0)

(funcall fn :line 100 100)))

(draw-path port #'generate 40 30 :filled t))

Draws 6 copies of a shape consisting of two lines and an arc:

(labels ((generate-1 (fn)

(funcall fn :line 50 0)

(funcall fn :line 50 50)

(funcall fn :arc 0 -50 100 100

(/ pi -2) (/ pi -2)))

(generate-6 (fn)

(dotimes (x 6)

(funcall fn :rotate (* 2 pi (/ x 6))

#'generate-1))))

(draw-path port #'generate-6 80 80))

```
(example-edit-file "capi/graphics/paths")
```

There are further examples in Self-contained examples.

*CAPI User Guide and Reference Manual (Unix version) - 3 Aug 2017*