(1)使用matplotlib采用交互式的绘制方式,自定义一个多边形(定点数大于6),并采用有效边表算法填充该多边形。要求:左键采集各顶点的坐标(采集时取整数坐标),并绘制多边形的轮廓,右键采用有效边
时间: 2024-10-19 09:13:43 浏览: 162
python实现扫描线填充算法,可以画凹多边形,采用matplotlib模块绘制图形
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在Python中,可以使用matplotlib库结合tkinter模块实现交互式绘图,并通过numpy处理多边形数据。首先,我们需要导入必要的库:
```python
import matplotlib.pyplot as plt
import numpy as np
from matplotlib.widgets import Button, PolygonSelector
import tkinter as tk
```
然后创建一个简单的窗口,嵌入绘图区域:
```python
fig, ax = plt.subplots()
ax.set_title("Polygon Drawing")
canvas = fig.canvas
# 初始化顶点列表为空
vertices = []
def onclick(event):
if event.button == 1: # 左键点击添加顶点
x, y = int(event.xdata), int(event.ydata)
vertices.append((x, y))
ax.plot(x, y, 'ro') # 添加红色圆点表示新顶点
if len(vertices) > 6:
polygon = PolygonSelector(ax, on_polygon_select, useblit=True,
button=1, minspanx=5, minspany=5,
interactive=True)
else:
print("Not enough vertices to form a polygon.")
elif event.button == 3: # 右键点击填充多边形
if len(vertices) >= 3:
poly = plt.Polygon(vertices, fill=False)
ax.add_patch(poly)
# 清除已有的选择器
if polygon is not None:
polygon.disconnect_events()
def on_polygon_select(polygon):
# 如果用户已经选择了某个多边形,则显示填充
ax.fill(*polygon.extents, color='blue')
polygon.disconnect_events()
button_left = Button(left=0.1, bottom=0.05, width=0.1, height=0.05, text="Left Click")
button_left.on_clicked(onclick)
button_right = Button(right=0.2, bottom=0.05, width=0.1, height=0.05, text="Right Click")
button_right.on_clicked(on_polygon_select)
canvas.mpl_connect('button_press_event', onclick)
plt.show()
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