Python用turtle画圆角矩形
时间: 2023-11-16 19:58:26 浏览: 690
Python中的turtle库可以用来绘制各种图形,包括圆角矩形。下面是一个简单的示例代码,可以画出一个圆角矩形:
```python
import turtle
# 设置画笔颜色和填充颜色
turtle.color("red", "yellow")
# 开始填充
turtle.begin_fill()
# 画圆角矩形
turtle.forward(100)
turtle.left(90)
turtle.circle(20, 90)
turtle.forward(60)
turtle.circle(20, 90)
turtle.forward(100)
turtle.circle(20, 90)
turtle.forward(60)
turtle.circle(20, 90)
# 结束填充
turtle.end_fill()
# 隐藏画笔
turtle.hideturtle()
# 显示绘图窗口
turtle.done()
```
这段代码首先导入了turtle库,然后设置了画笔颜色和填充颜色。接着开始填充,画出了一个圆角矩形,最后隐藏画笔并显示绘图窗口。
相关问题
python画圆角矩形
要在Python中画圆角矩形,可以使用Python的turtle或者pygame模块。下面是使用pygame模块画圆角矩形的示例代码:
```python
import pygame
pygame.init()
screen = pygame.display.set_mode((400, 400))
pygame.display.set_caption("Round Rectangle")
def round_rect(x, y, width, height, radius, color):
# 创建一个矩形对象
rect = pygame.Rect(x, y, width, height)
# 创建一个矩形对象,用于绘制圆角
corner = pygame.Rect(0, 0, radius*2, radius*2)
# 将圆角矩形分为四个部分
top_left = corner.copy()
top_right = corner.copy()
bottom_left = corner.copy()
bottom_right = corner.copy()
# 将圆角矩形的四个角都绘制成圆形
top_left.center = rect.topleft
top_right.center = rect.topright
bottom_left.center = rect.bottomleft
bottom_right.center = rect.bottomright
# 绘制圆角矩形
pygame.draw.rect(screen, color, rect)
pygame.draw.circle(screen, color, top_left.center, radius)
pygame.draw.circle(screen, color, top_right.center, radius)
pygame.draw.circle(screen, color, bottom_left.center, radius)
pygame.draw.circle(screen, color, bottom_right.center, radius)
# 绘制一个红色的圆角矩形
round_rect(100, 100, 200, 100, 20, (255, 0, 0))
pygame.display.update()
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
exit()
```
这段代码使用了pygame.Rect对象来表示圆角矩形和圆角。使用pygame.draw.rect方法和pygame.draw.circle方法来绘制圆角矩形。你可以根据需要调整圆角矩形的位置、大小、圆角半径和颜色等参数。
ros2乌龟画圆角矩形
在ROS 2 (Robot Operating System) 中,乌龟图元通常用于演示简单的机器人行为或者可视化操作。要让乌龟绘制带圆角的矩形,你可以使用` turtlesim`包中的`turtlebot2d`节点,并配合`geometry_msgs/PoseArray`消息。以下是一个简单的步骤:
1. 首先,确保已安装`turtlesim`和相关依赖。可以使用`ros2 pkg list | grep turtlesim`检查是否已经安装。
2. 创建一个Python脚本,例如`draw_round_rectangle.py`,导入必要的库并设置乌龟的位置、方向以及圆角半径。
```python
import rclpy
from rclpy.node import Node
from turtlesim.srv import SetPen, ClearScreen
from geometry_msgs.msg import PoseArray
class DrawRoundRectangle(Node):
def __init__(self):
super().__init__('draw_round_rectangle')
self.set_pen_client = self.create_client(SetPen, 'turtle/set_pen')
self.clear_screen_client = self.create_client(ClearScreen, 'turtle/clear')
self.rounded_rectangle_pose_array = PoseArray()
# 定义矩形的尺寸和圆角半径
self.width = 5.0
self.height = 4.0
self.radius = 0.5
def draw_rounded_rectangle(self):
# 设置圆角笔
request = SetPen.Request()
request.color = 255
request.fill = True
request.width = 1.0
self.get_logger().info('Setting pen for rounded rectangle...')
future = self.set_pen_client.call_async(request)
self.create_future(future)
# 生成带圆角的矩形路径
poses = []
for x in range(int(self.width / self.radius)):
for y in range(int(self.height / self.radius)):
pose = PoseArray.poses.append(
Pose(position=self.create_point(x * self.radius, y * self.radius), orientation=Pose.orientation.z))
poses.append(pose)
# 发送每个点作为pose到Turtlebot
for pose in poses:
future = self.publish_pose(pose)
self.create_future(future)
# 清除画布
request = ClearScreen.Request()
self.clear_screen_client.call_async(request)
def create_point(self, x, y):
return Point(x=x, y=y)
def publish_pose(self, pose_msg):
future = self.get_node_base_interface().get_topic('/turtle_pose').publish(pose_msg)
return future
def main(args=None):
rclpy.init(args=args)
node = DrawRoundRectangle()
try:
node.draw_rounded_rectangle()
except Exception as e:
node.get_logger().error('Error occurred while drawing:', cause=e)
finally:
rclpy.shutdown()
if __name__ == '__main__':
main()
```
运行这个脚本,乌龟会按照矩形路径绘制出带圆角的形状。注意,实际效果可能会因为乌龟移动的速度限制而显得不太圆滑。
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