掌握Angular 2：从基础到高级实战

Angular
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"《Pro Angular 2nd Edition》是一本由畅销作者Adam Freeman撰写的专业指南，专为希望创建动态JavaScript应用程序的Web开发者设计。本书深入浅出地讲解了Angular 2框架，这是构建现代Web应用的领先工具。读者将从MVC（模型-视图-控制器）模式的基础理解开始，了解到其优势，并逐步学习如何在实际项目中运用Angular。 书中涵盖了从基础知识到高级特性的全面教学，包括HTML、CSS、JavaScript和TypeScript的入门，以及如何构建体育商店（SportsStore）这样的实际应用。读者会学习如何创建数据绑定、内置指令、事件处理、组件、管道、服务、模块、路由和导航、动画等核心概念，掌握Angular项目的开发和测试。 本书适合已具备HTML和JavaScript基础的开发者，旨在帮助他们提升客户端应用的丰富性和动态性。章节安排循序渐进，不仅深入剖析每个主题，还提供了常见问题的解决方案，确保读者能避免常见陷阱，实现高效开发。此外，作者还探讨了Angular的Reactive Extensions和异步HTTP请求，以及如何进行单元测试，确保代码质量。 《Pro Angular 2nd Edition》是一本实用的教程，旨在为读者提供扎实的Angular 2技能，使他们能够充分利用现代浏览器的能力，构建出强大且易于维护的Web应用。无论是初学者还是经验丰富的开发者，都能从中获益匪浅。"

Rails.Angular.Postgres.and.Bootstrap.2nd.Edition

2016-10-25 上传
This second edition is updated to cover Angular 2 - a completely reworked front-end framework - and dives into new Postgres 9.5 features such as UPSERT. Also new is Webpack coverage, to develop the ...

Learning.Web.Development.with.Bootstrap.and.Angular.2nd.Edition.epub

2016-12-12 上传
Build, develop, and customize your application using Angular.js and Bootstrap Packed with tips to help you avoid potential stumbling blocks while developing Book Description Two of the most popular ...

Packt.Angular.2.Cookbook.2nd.Edition.2017

2017-01-24 上传
### Angular 2 Cookbook 第二版 (2017) 关键知识点解析 #### 章节一：升级至 Angular 2 的策略 ##### 组件化指令利用 `controllerAs` 封装 - **简介**：介绍了如何将 Angular 1.x 的指令(component 或 directive)...

#include "ros/ros.h" #include <geometry_msgs/Twist.h> int main(int argc, char *argv[]) { double PI = 3.141592653589793653589793; ros::init(argc, argv, "heart_shape"); ros::NodeHandle n; ros::Publisher vel_pub = n.advertise<geometry_msgs::Twist>("/turtle1/cmd_vel", 10); geometry_msgs::Twist vel_cmd; ros::Rate loopRate(2); int count = 0; int i = 0; while (ros::ok()) { geometry_msgs::Twist msg; msg.linear.x = 1; msg.angular.z = 1; i++; if (i ==9 ) { msg.linear.x = 0; msg.angular.z = 2*PI; } if (i == 16) { ; msg.linear.x = 1.0; msg.angular.z = 2; } if (i >= 17) { ; msg.linear.x = 1; msg.angular.z = 0; i++; if (i >= 27) { msg.linear.x = 0.15; msg.linear.y = 1; i++; if (i >= 43) { msg.linear.x = 0; msg.linear.y = 0; } } } vel_pub.publish(msg); ROS_INFO_STREAM("Sending random velocity command: " << "linear = " << msg.linear.x << " angular = " << msg.angular.z); loopRate.sleep(); } return 0; }修改为循环画无限符号

2023-05-25 上传
msg.angular.z = 1; i++; if (i == 9) { msg.linear.x = 0; msg.angular.z = 2 * PI; } else if (i == 16) { msg.linear.x = 1.0; msg.angular.z = 2; } else if (i >= 17 && i ) { msg.linear.x = ...

cmd_vel_.angular.z

2023-04-04 上传
However, based on what I understand, cmd_vel_.angular.z is likely a variable or attribute in a software program that controls the angular velocity (rotation) of a robot or vehicle. The "z" likely ...

while not rospy.is_shutdown(): poscom.header.stamp = rospy.Time.now() poscom.header.frame_id = "world" # 机器人运动的参考坐标系是世界坐标系 poscom.pose.position.x = 2.5 * math.sin(math.pi * i / 400) poscom.pose.position.y = 5 * math.sin(math.pi * i / 800) poscom.pose.position.z = 2 # 设置位置控制消息的时间戳和坐标系 poscom_twist = TwistStamped() poscom_twist.twist.linear.x = 0 poscom.header.stamp = rospy.Time.now() poscom.header.frame_id = "base_link" # 设置位置控制消息的速度、加速度、偏航角和加加速度 poscom.twist.linear.y = 0 poscom.twist.linear.z = 0 poscom.twist.angular.x = 0 poscom.twist.angular.y = 0 poscom.twist.angular.z = 0 poscom.twist.angular.w = 0 # 发布位置控制消息 local_pos_pub3.publish(poscom) 更正后代码出现下列错误poscom.twist.linear.y = 0 AttributeError: 'PoseStamped' object has no attribute 'twist'

2023-06-13 上传
poscom_twist.twist.angular.x = 0 poscom_twist.twist.angular.y = 0 poscom_twist.twist.angular.z = 0 local_pos_pub3.publish(poscom) local_pos_pub3.publish(poscom_twist) ``` 希望这可以帮助你解决...

#include <ros/ros.h> #include <geometry_msgs/Twist.h> #include <math.h> int main(int argc, char** argv) { ros::init(argc, argv, "turtle_triangle"); ros::NodeHandle node; // 创建一个发布器，用于发布速度消息 ros::Publisher pub = node.advertise<geometry_msgs::Twist>("/turtle1/cmd_vel", 1000); // 设置循环频率，每秒10次 ros::Rate rate(10); // 初始化速度消息 geometry_msgs::Twist vel_msg; vel_msg.linear.x = 0; vel_msg.linear.y = 0; vel_msg.linear.z = 0; vel_msg.angular.x = 0; vel_msg.angular.y = 0; vel_msg.angular.z = 0; // 设定三角形边长和角度 double side_length = 1.0; double angle = M_PI / 3.0; // 循环绘制三角形 for (int i = 0; i < 3; i++) { // 线速度为正，角速度为0，直行一段距离 vel_msg.linear.x = side_length; pub.publish(vel_msg); double t0 = ros::Time::now().toSec(); double current_distance = 0.0; while (current_distance < side_length) { pub.publish(vel_msg); double t1 = ros::Time::now().toSec(); current_distance = vel_msg.linear.x * (t1 - t0); } // 线速度为0，角速度为正，原地旋转一定角度 vel_msg.linear.x = 0; vel_msg.angular.z = angle; pub.publish(vel_msg); double t2 = ros::Time::now().toSec(); double current_angle = 0.0; while (current_angle < angle) { pub.publish(vel_msg); double t3 = ros::Time::now().toSec(); current_angle = vel_msg.angular.z * (t3 - t2); } // 重置角速度 vel_msg.angular.z = 0; } return 0; }改成循环运行三次

2023-05-25 上传
可以将代码修改为： ... current_angle = vel_msg.angular.z * (t3 - t2); } // 重置角速度 vel_msg.angular.z = 0; } } return 0; } ``` 这样就可以让代码循环运行三次，绘制出三个等边三角形了。

将下列Python代码更正local_pos_pub3 = rospy.Publisher('mavros/setpoint_position/local', PoseStamped, queue_size=10) # poscom = PoseStamped() #消息类型PositionCommand() 改成PoseStamped() rate = rospy.Rate(20.0) i = 0 while not rospy.is_shutdown(): poscom.header.stamp = rospy.Time.now() poscom.header.frame_id = "world" poscom.pose.position.x = 2.5 * math.sin(math.pi * i / 400) poscom.pose.position.y = 5 * math.sin(math.pi * i / 800) poscom.pose.position.z = 2 poscom_twist = TwistStamped() poscom_twist.header.stamp = rospy.Time.now() poscom_twist.header.frame_id = "base_link" poscom_twist.twist.linear.x = 0 poscom_twist.twist.linear.y = 0 poscom_twist.twist.linear.z = 0 poscom_twist.twist.angular.x = 0 poscom_twist.twist.angular.y = 0 poscom_twist.twist.angular.z = 0 local_pos_pub3.publish(poscom) local_pos_pub4.publish(poscom_twist)

2023-06-13 上传
poscom_twist.twist.angular.x = 0 poscom_twist.twist.angular.y = 0 poscom_twist.twist.angular.z = 0 local_pos_pub3.publish(poscom) local_pos_pub4.publish(poscom_twist) i += 1 rate.sleep() ```...

if (cmd_vel.linear.x < vp_min+1500) cmd_vel.linear.x = vp_min+1500; if (mapPathNum <= 0) { //if now the path is empty then v=kv ROS_WARN("---------------NO PATH TO GO"); cmd_vel.linear.x = 115; //cmd_vel.angular.z = anglelast + 0.1; } if (cmd_vel.linear.x > vp_max_base+1500) cmd_vel.linear.x = vp_max_base+1500; if (cmd_vel.angular.z > 135) cmd_vel.angular.z = 135; else if (cmd_vel.angular.z < 45) cmd_vel.angular.z = 45; ROS_INFO("Lfw = %.2f", Lfw); ROS_INFO("eta = %.2f", eta * 180 / PI); ROS_INFO("encoder_v = %.2f", encoder_speed); ROS_INFO("out_speed = %.2f", cmd_vel.linear.x); ROS_INFO("out_angle = %.2f", cmd_vel.angular.z); ROS_INFO("------------------------"); } } }

2023-06-07 上传
输出语句用于输出一些调试信息，包括前视距离 Lfw、当前航向角 eta、小车的编码器速度 encoder_speed、输出的线速度和角速度 cmd_vel.linear.x 和 cmd_vel.angular.z 等信息。 这些限制条件和输出语句可以帮助我们...

#include "ros/ros.h" #include "geometry_msgs/Twist.h" int main(int argc, char * argv[]) { ros::init(argc,argv,"pub"); ros::NodeHandle nodeHandle; ros::Publisher publisher = nodeHandle.advertise<geometry_msgs::Twist>("/turtle1/cmd_vel",10); geometry_msgs::Twist message; //线速度————控制前后移动，正数前进，负数后退 message.linear.x = 2.0;//线速度 message.linear.y = 0.0; message.linear.z = 0.0; //角速度————控制旋转，正数顺时针，负数逆时针 message.angular.x = 0.0; message.angular.y = 0.0; message.angular.z = 1.0; ros::Rate rate(1); while(ros::ok()) { publisher.publish(message); rate.sleep(); } return 0; }这个代码怎么修改成让乌龟走正方形

2023-05-24 上传
message.angular.z = 0.0; ros::Rate rate(1); int count = 0; while(count ) { // 循环4次，每次走直线和转弯 // 走直线 double t1 = ros::Time::now().toSec(); double distance = 0.0; while(distance ) ...
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