用Python写一个等分切割矢量多边形的脚本
时间: 2024-04-18 18:25:37 浏览: 123
以下是使用 Python 编写的一个简单示例脚本,用于等分切割矢量多边形:
```python
from shapely.geometry import Polygon, LineString
def split_polygon(polygon, cutting_line):
intersections = polygon.exterior.intersection(cutting_line)
if intersections.is_empty:
return [polygon]
if intersections.geom_type == 'Point':
intersections = [intersections]
else:
intersections = list(intersections)
sorted_intersections = sorted(intersections, key=lambda p: polygon.exterior.project(p))
polygons = []
previous_intersection = None
for intersection in sorted_intersections:
if previous_intersection is None:
start_point = polygon.exterior.interpolate(0.0, normalized=True)
else:
start_point = previous_intersection
end_point = intersection
sub_polygon = Polygon([start_point] + list(polygon.exterior.coords)[polygon.exterior.coords.index(start_point.coords[0])+1 : polygon.exterior.coords.index(end_point.coords[0])+1] + [end_point])
polygons.append(sub_polygon)
previous_intersection = intersection
return polygons
# 示例用法
polygon = Polygon([(0, 0), (0, 5), (5, 5), (5, 0)]) # 定义一个矩形多边形
cutting_line = LineString([(1, 3), (4, 3)]) # 定义切割线
result = split_polygon(polygon, cutting_line)
for sub_polygon in result:
print(sub_polygon)
```
这个示例使用了 Shapely 库来处理矢量几何对象。它定义了一个名为 `split_polygon` 的函数,该函数接受一个多边形和一个切割线作为输入,并返回切割后的子多边形列表。示例用法中的多边形是一个矩形,切割线是从 (1, 3) 到 (4, 3) 的直线。程序将切割结果打印出来。
请注意,此示例仅处理多边形的外环,并且假设切割线不会与多边形的内环相交。如果需要处理更复杂的情况,可能需要进一步的逻辑和算法来处理内环或自相交等情况。
阅读全文