Write a piece of pseudo-code that override the onTouchEvent function in a View to perform “rotation” of the View content. You should use the appropriate event actions. No code needed for the object drawing

时间: 2023-07-16 07:17:03 浏览: 75
Here is an example of how to override the onTouchEvent function in a View to perform rotation of the View content: ``` public class MyView extends View { private float mLastTouchX; private float mLastTouchY; public MyView(Context context) { super(context); } @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: mLastTouchX = event.getX(); mLastTouchY = event.getY(); break; case MotionEvent.ACTION_MOVE: float dx = event.getX() - mLastTouchX; float dy = event.getY() - mLastTouchY; float angle = (float) Math.atan2(dy, dx); setRotation(angle * 180 / (float) Math.PI); break; } return true; } } ``` This code creates a custom View called `MyView` and overrides its `onTouchEvent` function. When the user touches down on the view, the code saves the coordinates of the touch. When the user moves their finger across the screen, the code calculates the angle between the initial touch position and the current touch position, and uses that angle to set the rotation of the view. The `setRotation` method is a built-in method of the View class that sets the rotation of the view in degrees. Note that this code assumes that the View already has content to rotate. No code is provided for drawing the object itself.

相关推荐

Before Playstation, there was Pong, at one time the ultimate in video game entertainment. For those of you not familiar with this game please refer to the Wikipedia entry (http://en.wikipedia.org/wiki/Pong) and the many fine websites extolling the game and its virtues. Pong is not so very different in structure from the Billiard ball simulation that you developed earlier in the course. They both involve a ball moving and colliding with obstacles. The difference in this case is that two of the obstacles are under user control. The goal of this project is to develop your own version of Pong in MATLAB using the keyboard as input, for example, one player could move the left paddle up and down using the q and a keys while the right paddle is controlled with the p and l keys. You may check the code for the Lunarlander game which demonstrates some of the techniques you can use to capture user input. You will also probably find the plot, set, line and text commands useful in your program. You have used most of these before in the billiard simulation and you can use Matlabs online help to get more details on the many options these functions offer. Your program should allow you to play a game to 11 keeping track of score appropriately. The general structure of the code is outlined below in pseudo code While not done Update Ball State (position and velocity) taking into account collisions with walls and paddles Check for scoring and handle appropriately Update Display Note that in this case it is implicitly assumed that capturing the user input and moving the paddles is being handled with callback functions which removes that functionality from the main loop. For extra credit you could consider adding extra features like spin or gravity to the ball flight or providing a single player mode where the computer controls one of the paddles.

最新推荐

recommend-type

JavaScript获取伪元素(Pseudo-Element)属性的方法技巧

主要介绍了JavaScript获取伪元素(Pseudo-Element)属性的方法技巧,本文直接给出实现代码,需要的朋友可以参考下
recommend-type

z-blog模板网站导航网站源码 带后台管理.rar

z-blog模板网站导航网站源码 带后台管理.rarz-blog模板网站导航网站源码 带后台管理.rar
recommend-type

基于TI的MSP430单片机的无叶风扇控制器+全部资料+详细文档(高分项目).zip

【资源说明】 基于TI的MSP430单片机的无叶风扇控制器+全部资料+详细文档(高分项目).zip基于TI的MSP430单片机的无叶风扇控制器+全部资料+详细文档(高分项目).zip基于TI的MSP430单片机的无叶风扇控制器+全部资料+详细文档(高分项目).zip 【备注】 1、该项目是个人高分项目源码,已获导师指导认可通过,答辩评审分达到95分 2、该资源内项目代码都经过测试运行成功,功能ok的情况下才上传的,请放心下载使用! 3、本项目适合计算机相关专业(人工智能、通信工程、自动化、电子信息、物联网等)的在校学生、老师或者企业员工下载使用,也可作为毕业设计、课程设计、作业、项目初期立项演示等,当然也适合小白学习进阶。 4、如果基础还行,可以在此代码基础上进行修改,以实现其他功能,也可直接用于毕设、课设、作业等。 欢迎下载,沟通交流,互相学习,共同进步!
recommend-type

1124905257887411C++图书管理系统.zip

1124905257887411C++图书管理系统.zip
recommend-type

node-v4.1.0-linux-armv7l.tar.xz

Node.js,简称Node,是一个开源且跨平台的JavaScript运行时环境,它允许在浏览器外运行JavaScript代码。Node.js于2009年由Ryan Dahl创立,旨在创建高性能的Web服务器和网络应用程序。它基于Google Chrome的V8 JavaScript引擎,可以在Windows、Linux、Unix、Mac OS X等操作系统上运行。 Node.js的特点之一是事件驱动和非阻塞I/O模型,这使得它非常适合处理大量并发连接,从而在构建实时应用程序如在线游戏、聊天应用以及实时通讯服务时表现卓越。此外,Node.js使用了模块化的架构,通过npm(Node package manager,Node包管理器),社区成员可以共享和复用代码,极大地促进了Node.js生态系统的发展和扩张。 Node.js不仅用于服务器端开发。随着技术的发展,它也被用于构建工具链、开发桌面应用程序、物联网设备等。Node.js能够处理文件系统、操作数据库、处理网络请求等,因此,开发者可以用JavaScript编写全栈应用程序,这一点大大提高了开发效率和便捷性。 在实践中,许多大型企业和组织已经采用Node.js作为其Web应用程序的开发平台,如Netflix、PayPal和Walmart等。它们利用Node.js提高了应用性能,简化了开发流程,并且能更快地响应市场需求。
recommend-type

zigbee-cluster-library-specification

最新的zigbee-cluster-library-specification说明文档。
recommend-type

管理建模和仿真的文件

管理Boualem Benatallah引用此版本:布阿利姆·贝纳塔拉。管理建模和仿真。约瑟夫-傅立叶大学-格勒诺布尔第一大学,1996年。法语。NNT:电话:00345357HAL ID:电话:00345357https://theses.hal.science/tel-003453572008年12月9日提交HAL是一个多学科的开放存取档案馆,用于存放和传播科学研究论文,无论它们是否被公开。论文可以来自法国或国外的教学和研究机构,也可以来自公共或私人研究中心。L’archive ouverte pluridisciplinaire
recommend-type

实现实时数据湖架构:Kafka与Hive集成

![实现实时数据湖架构:Kafka与Hive集成](https://img-blog.csdnimg.cn/img_convert/10eb2e6972b3b6086286fc64c0b3ee41.jpeg) # 1. 实时数据湖架构概述** 实时数据湖是一种现代数据管理架构,它允许企业以低延迟的方式收集、存储和处理大量数据。与传统数据仓库不同,实时数据湖不依赖于预先定义的模式,而是采用灵活的架构,可以处理各种数据类型和格式。这种架构为企业提供了以下优势: - **实时洞察:**实时数据湖允许企业访问最新的数据,从而做出更明智的决策。 - **数据民主化:**实时数据湖使各种利益相关者都可
recommend-type

list根据id查询pid 然后依次获取到所有的子节点数据

可以使用递归的方式来实现根据id查询pid并获取所有子节点数据。具体实现可以参考以下代码: ``` def get_children_nodes(nodes, parent_id): children = [] for node in nodes: if node['pid'] == parent_id: node['children'] = get_children_nodes(nodes, node['id']) children.append(node) return children # 测试数
recommend-type

JSBSim Reference Manual

JSBSim参考手册,其中包含JSBSim简介,JSBSim配置文件xml的编写语法,编程手册以及一些应用实例等。其中有部分内容还没有写完,估计有生之年很难看到完整版了,但是内容还是很有参考价值的。