layer | 易学教程

Clear WMS layer before redraw on OpenLayers

阅读更多关于 Clear WMS layer before redraw on OpenLayers

问题 I'm currently successfully displaying multiple layers using OpenLayers (Vector and WMS). My application allow the user to modify some parameters, which will : * modify bound * modify map center * modify the WMS image I use Ajax to avoid page reload, it works nicely, however when some layers take a while to load, the others which are not yet redrawn are still shown in the background (but aren't related at all to my new context). I would like to clear WMS layers (if possible) before re-asking

Leaflet.js - Create layers and add markers depending on geojson category data?

阅读更多关于 Leaflet.js - Create layers and add markers depending on geojson category data?

问题 I have a .js file with coordinates for internships: var internships = [{ "features": [ {"type":"Feature","properties":{"category":"entretient","Name":"green"},"geometry":{"type":"Point","coordinates":[50.807149, 3.162994]}}, {"type":"Feature","properties":{"category":"securité","Name":"blue"},"geometry":{"type":"Point","coordinates":[50.334421, 3.290146]}}, {"type":"Feature","properties":{"category":"secretaria","Name":"red"},"geometry":{"type":"Point","coordinates":[50.744787, 2.256216]}} ]

JESD204B学习之关键点问答

阅读更多关于 JESD204B学习之关键点问答

【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> JESD204B Survival Guide 中文版 JESD204B学习之关键点问答 1.概述本文是用于记录JESD204B学习中的关键点，以问答的形式陈诉便于理清思路。 2.参考文档 1.《pg066-jesd204》 2.《ug476_7Series_GTX_GTH_Transceivers》 3.《AD9680》 4.《AD9144》 3.JESD204B关键问题 3.1 JESD204有多少个子类，怎么设置？ JESD204有3个子类： Subclass 0：主要用于JESD204A； Subclass 1：用于JESD204B，有确定性延时，带sysref与sync； Subclass 2：用于JESD204B，有确定性延时，值需要sync信号即可。在IP核设置中，是通过AXI-LITE设置寄存器subclass mode，如下图。在AD或者DA芯片中是通过SPI等配置芯片的寄存器来设置。IP的设置与AD,DA芯片的设置需要一一对应。 3.2 IP核设置中的F/K依据是什么？ F：每帧的8位个数； K：每个多帧的帧数； F与K的设置是需要根据AD或者DA芯片的寄存器设置相互对应的。比如下图中是AD9680的配置选项图。 3.3 IP核设置中的参考时钟（reference clock）

how to darken a UIImageView

阅读更多关于 how to darken a UIImageView

问题 I need to darken a UIImageView when it gets touched, almost exactly like icons on the springboard (home screen). Should I be added UIView with a 0.5 alpha and black background. This seems clumsy. Should I be using Layers or something (CALayers). 回答1: How about subclassing UIView and adding a UIImage ivar (called image)? Then you could override -drawRect: something like this, provided you had a boolean ivar called pressed that was set while touched. - (void)drawRect:(CGRect)rect { [image

Showing sets of markers on different layers of Google map

阅读更多关于 Showing sets of markers on different layers of Google map

问题 I need to show a set of markers on a Google map. I know markers can be added directly on a Google map but given that I have 3 sets of markers, one for shops, one for parks and another one for hotels, how can I show them on 3 different layers and so that later on using javascript, I be able to hide one set of markers by doing sort of: myLayer2.setMap(null); I have checked Panoramio layer but it needs the images first to be uploaded to panoramio, but in my case for some particular security

How to apply Perspective 3d Transform on image and save that image in document directory

阅读更多关于 How to apply Perspective 3d Transform on image and save that image in document directory

问题 I am applying 3D transform on a image layer by follow code. UIImageView *view = (UIImageView *)[recognizer view]; CGPoint translation = [recognizer translationInView:self.view]; CGPoint newCenter = view.center; newCenter.x += translation.x; newCenter.y += translation.y; view.center = newCenter; [recognizer setTranslation:CGPointZero inView:self.view]; Following is the from which the points are converted to transform. UIView+Quadrilateral [self.view transformToFitQuadTopLeft:self

HTTPS是什么？SSL/TLS又是什么？

阅读更多关于 HTTPS是什么？SSL/TLS又是什么？

【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> HTTPS是什么？SSL/TLS又是什么？什么是安全？通常认为，如果通信过程具备了四个特性，就可以认为是“安全”的，这四个特性是：机密性（Secrecy/Confidentiality）、完整性（Integrity，也叫一致性），身份认证（Authentication）和不可否认（Non-repudiation/Undeniable）。 SSL/TLS SSL 即安全套接层（Secure Sockets Layer） TLS（传输层安全，Transport Layer Security），正式标准化，版本号从 1.0 重新算起，所以 TLS1.0 实际上就是 SSLv3.1。密码套件 “ECDHE-RSA-AES256-GCM-SHA384”。基本的形式是“密钥交换算法 + 签名算法 + 对称加密算法 + 摘要算法”，比如刚才的密码套件的意思就是： “握手时使用 ECDHE 算法进行密钥交换，用 RSA 签名和身份认证，握手后的通信使用 AES 对称算法，密钥长度 256 位，分组模式是 GCM，摘要算法 SHA384 用于消息认证和产生随机数。” 机密性由对称加密AES保证，完整性由SHA384摘要算法保证，身份认证和不可否认由RSA非对称加密保证 OpenSSL 是著名的开源密码学工具包，是

Where to define the interfaces for a repository in an layered architecture?

阅读更多关于 Where to define the interfaces for a repository in an layered architecture?

问题 Background I'm trying to create a simple application to really understand the whole stack of DDD+TDD+etc. My goal is to dynamically inject the DAL repository classes at runtime. This keeps my Domain and Application Services layers testable. I plan on using "poor man's DI" to accomplish this for now ... so I would do this in a simple Console application near startup: // Poor man's DI, injecting DAL repository classes at runtime var productRepository = new SimpleOrder.Repository

Where to define the interfaces for a repository in an layered architecture?

阅读更多关于 Where to define the interfaces for a repository in an layered architecture?

How can I map click events to elements in multiple layers?

阅读更多关于 How can I map click events to elements in multiple layers?

问题 I have multiple SVG elements that are in separate groups. They overlap each other. Example: <svg id="board" width="100%" height="80%"> <g id="terrain" class="layer"> <path d="M-32,-32L32,-32 32,32 -32,32Z" transform="translate(0, 0)" class="mote terrain hill"></path> </g> <g id="guy" class="layer"> <path d="M-21...Z" transform="translate(192, 448)" class="mote guy"></path> </g> </svg> When an x, y position that matches both is clicked, I want to know all that both were clicked. If I bind each