用lisp写一段cad提取坐标代码
时间: 2023-02-06 07:14:29 浏览: 95
好的,这是一段使用 Lisp 语言编写的 CAD 提取坐标的代码示例:
```
(defun extract-coordinates (entities)
"Extract the coordinates of the given entities."
(mapcar (lambda (e) (entity-coordinates e)) entities))
(defun entity-coordinates (entity)
"Return the coordinates of the given entity."
(cond ((point-entity-p entity) (point-coordinates entity))
((line-entity-p entity) (line-coordinates entity))
((arc-entity-p entity) (arc-coordinates entity))
((circle-entity-p entity) (circle-coordinates entity))
(t (error "Unsupported entity type: ~a" entity))))
(defun point-coordinates (point)
"Return the coordinates of the given point."
(point-position point))
(defun line-coordinates (line)
"Return the coordinates of the start and end points of the given line."
(list (line-start-point line) (line-end-point line)))
(defun arc-coordinates (arc)
"Return the coordinates of the center and end points of the given arc."
(list (arc-center arc) (arc-end-point arc)))
(defun circle-coordinates (circle)
"Return the coordinates of the center and a point on the circumference of the given circle."
(list (circle-center circle) (point-on-circle circle)))
```
这段代码定义了一个 `extract-coordinates` 函数,它接受一个参数 `entities`,表示要提取坐标的实体列表。函数内部调用了 `mapcar` 函数,将列表中的每个实体都传递给 `entity-coordinates` 函数,然后将每个实体的坐标提取出来,最终将所有实体的坐标组成的列表返回。
`entity-coordinates` 函数利用 `cond` 语句,根据实体的类型调用相应的函数提取坐标。例如,如果实体是点,则调用 `point-coordinates` 函数;如果实体是线,则调用 `line-coordinates` 函数,以此类