var attitude = $.flightIndicator("#attitude", "attitude", { roll: 0, pitch: 0, });语法是什么意思
时间: 2023-07-15 15:13:51 浏览: 38
这段代码是使用 jQuery 插件 Flight Indicator 来创建一个飞行仪器的显示。具体来说:
- `$.flightIndicator` 是一个 jQuery 插件的调用,它用于创建一个 Flight Indicator 控件。
- `"#attitude"` 是一个 CSS 选择器,用来指定一个 DOM 元素作为飞行仪器的容器。
- `"attitude"` 是控件的类型,表示这是一个姿态仪器,用于显示飞机的翻滚 (roll) 和俯仰 (pitch) 状态。
- `{ roll: 0, pitch: 0 }` 是一个配置对象,用于指定控件的初始状态,这里的值都是 0。
综合起来,这段代码的作用就是在一个指定的 DOM 元素中创建一个 Flight Indicator 控件,用于显示飞机的翻滚和俯仰状态,并将其初始化为零。
相关问题
img = Image.open('C:\yingxiang\DJI_20230322140516_0026_V.JPG') # 获取 EXIF 数据 exif_data = img._getexif() # 获取方位元素信息 orientation = exif_data.get(274) # 方向信息标签为274 if orientation == 1: # 没有方向信息 pass elif orientation == 2: img = img.transpose(Image.FLIP_LEFT_RIGHT) elif orientation == 3: img = img.rotate(180) elif orientation == 4: img = img.rotate(180).transpose(Image.FLIP_LEFT_RIGHT) elif orientation == 5: img = img.rotate(-90).transpose(Image.FLIP_LEFT_RIGHT) elif orientation == 6: img = img.rotate(-90) elif orientation == 7: img = img.rotate(90).transpose(Image.FLIP_LEFT_RIGHT) elif orientation == 8: img = img.rotate(90) # 获取航向角、俯仰角和滚转角 roll = exif_data.get(204) / 100.0 # 滚转角标签为204,单位为1/100度 pitch = exif_data.get(206) / 100.0 # 俯仰角标签为206,单位为1/100度 yaw = exif_data.get(208) / 100.0 # 航向角标签为208,单位为1/100度 print(roll,pitch,yaw)这段代码怎么改可以确保变量不为空,再进行除法运算
你可以使用异常处理来确保变量不为空,再进行除法运算。例如,你可以使用try-except语句来捕获可能引发ZeroDivisionError或TypeError异常的情况,并在出现异常时进行处理。具体代码如下所示:
```
img = Image.open('C:\yingxiang\DJI_20230322140516_0026_V.JPG')
# 获取 EXIF 数据
exif_data = img._getexif()
# 获取方位元素信息
orientation = exif_data.get(274)
# 方向信息标签为274
if orientation == 1:
# 没有方向信息
pass
elif orientation == 2:
img = img.transpose(Image.FLIP_LEFT_RIGHT)
elif orientation == 3:
img = img.rotate(180)
elif orientation == 4:
img = img.rotate(180).transpose(Image.FLIP_LEFT_RIGHT)
elif orientation == 5:
img = img.rotate(-90).transpose(Image.FLIP_LEFT_RIGHT)
elif orientation == 6:
img = img.rotate(-90)
elif orientation == 7:
img = img.rotate(90).transpose(Image.FLIP_LEFT_RIGHT)
elif orientation == 8:
img = img.rotate(90)
# 获取航向角、俯仰角和滚转角
try:
roll = exif_data.get(204) / 100.0 # 滚转角标签为204,单位为1/100度
pitch = exif_data.get(206) / 100.0 # 俯仰角标签为206,单位为1/100度
yaw = exif_data.get(208) / 100.0 # 航向角标签为208,单位为1/100度
except (ZeroDivisionError, TypeError):
print("发生除零或类型错误异常,无法计算角度值。")
roll, pitch, yaw = None, None, None
print(roll, pitch, yaw)
```
在这个代码中,我们使用try-except语句来捕获可能引发ZeroDivisionError或TypeError异常的情况。如果出现异常,我们会在控制台上打印一条错误消息,并将变量roll、pitch、yaw设置为None。这样可以确保变量不为空,避免了除以0或类型错误的情况。
将C++#include <ros/ros.h> #include <ros/package.h> #include <quadrotor_msgs/PositionCommand.h> #include <nav_msgs/Odometry.h> #include <sensor_msgs/Joy.h> #include<mavros_msgs/AttitudeTarget.h> #include <tf/tf.h> #include <math.h> using namespace std; int main(int argc, char **argv) { ros::init(argc, argv, "traj_pub"); //##节点名traj_pub ros::NodeHandle nh; // ros::Publisher local_pos_pub3 = nh.advertise<quadrotor_msgs::PositionCommand> ("/position_cmd", 10); //##话题名字为/——position_cmd 10为缓存长度 quadrotor_msgs::PositionCommand poscom; //ros::Publisher local_pos_pub3 = nh.advertise<mavros_msgs::AttitudeTarget> // ("/mavros/setpoint_raw/attitude", 10); //mavros_msgs::AttitudeTarget msg; ros::Rate rate(20.0); //##循环频率20 int i = 0; while(ros::ok()) { poscom.position.x = 2.5*sin(M_PI*i/400); poscom.position.y = 5*sin(M_PI*i/800); poscom.position.z = 2; poscom.velocity.x = 0; poscom.velocity.y = 0; poscom.velocity.z = 0; poscom.acceleration.x = 0; poscom.acceleration.y = 0; poscom.acceleration.z = 0; poscom.yaw = 0; poscom.jerk.x=0; poscom.jerk.y=0; poscom.jerk.z=0; local_pos_pub3.publish(poscom); // tf::Quaternion q = tf::createQuaternionFromRPY(0, 0, 0.5); // msg.type_mask = msg.IGNORE_ROLL_RATE || msg.IGNORE_PITCH_RATE || msg.IGNORE_YAW_RATE; // msg.orientation.x = q.x(); // msg.orientation.y = q.y(); // msg.orientation.z = q.z(); // msg.orientation.w = q.w(); // msg.thrust = 0.75; // local_pos_pub3.publish(msg); ros::spinOnce(); rate.sleep(); i++; } } 转成pyrhon
以下是将C++代码转换为Python代码的结果:
```python
import rospy
import rospkg
from quadrotor_msgs.msg import PositionCommand
from nav_msgs.msg import Odometry
from sensor_msgs.msg import Joy
from mavros_msgs.msg import AttitudeTarget
from tf.transformations import euler_from_quaternion
import math
rospy.init_node('traj_pub')
local_pos_pub3 = rospy.Publisher('/position_cmd', PositionCommand, queue_size=10)
poscom = PositionCommand()
rate = rospy.Rate(20.0)
i = 0
while not rospy.is_shutdown():
poscom.position.x = 2.5 * math.sin(math.pi * i / 400)
poscom.position.y = 5 * math.sin(math.pi * i / 800)
poscom.position.z = 2
poscom.velocity.x = 0
poscom.velocity.y = 0
poscom.velocity.z = 0
poscom.acceleration.x = 0
poscom.acceleration.y = 0
poscom.acceleration.z = 0
poscom.yaw = 0
poscom.jerk.x = 0
poscom.jerk.y = 0
poscom.jerk.z = 0
local_pos_pub3.publish(poscom)
# Uncomment the following code to publish attitude target message
# msg = AttitudeTarget()
# q = tf.transformations.quaternion_from_euler(0, 0, 0.5)
# msg.type_mask = msg.IGNORE_ROLL_RATE | msg.IGNORE_PITCH_RATE | msg.IGNORE_YAW_RATE
# msg.orientation.x = q[0]
# msg.orientation.y = q[1]
# msg.orientation.z = q[2]
# msg.orientation.w = q[3]
# msg.thrust = 0.75
# local_pos_pub3.publish(msg)
rate.sleep()
i += 1
```
请注意,由于Python语言的特点,代码的结构和语法与C++可能略有不同。此外,需要针对Python的ROS库进行适当的调整。同时请注意,由于Python中没有命名空间的概念,因此不需要使用`using namespace std;`。