layer | 易学教程

Insert Layer underneath existing layers in ggplot2 object

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问题 Given an Existing plot object is it possible to add a layer UNDERNEATH an existing layer? Example, in the graph below, is it possible to add geom_boxplot() to P such that the boxplot appears underneath geom_point() ? ## Starting from: library(ggplot2) P <- ggplot(data=dat, aes(x=id, y=val)) + geom_point() ## This adds boxplot, but obscures some of the points P + geom_boxplot() Expected Output: # Which is essentially ggplot(data=dat, aes(x=id, y=val)) + geom_boxplot() + geom_point() ## However

Drawing gradient over image in ios

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问题 How to create gradient colour look like following image programatically. 回答1: When you say "apply it over the image as a gradient", do you mean as a mask (revealing the image at the top, having it fade the image to transparent at the bottom)? If that's the case, you can apply that gradient as a mask, using CAGradientLayer : CAGradientLayer *gradientMask = [CAGradientLayer layer]; gradientMask.frame = self.imageView.bounds; gradientMask.colors = @[(id)[UIColor whiteColor].CGColor, (id)[UIColor

Specifying the order of matplotlib layers

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问题 Suppose I run the following script: import matplotlib.pyplot as plt lineWidth = 20 plt.figure() plt.plot([0,0],[-1,1], lw=lineWidth, c='b') plt.plot([-1,1],[-1,1], lw=lineWidth, c='r') plt.plot([-1,1],[1,-1], lw=lineWidth, c='g') plt.show() This produces the following: How can I specify the top-to-bottom order of the layers instead of having Python pick for me? 回答1: I don't know why zorder has that behavior and it's likely that might be a bug or, at the very least, a badly documented feature.

geoserver 连接 postgis 发布Layer

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本文测试环境为Windows 10。首先安装geoserver，官方网站 http://geoserver.org/ 。浏览器输入地址 http://localhost:8080/geoserver/web/ ，输入账号密码admin和geoserver。登录界面如下所示：点击数据存储，添加新的数据存储，PostGIS，选择工作区，填写连接参数，点击保存。本机测试数据库环境IP为192.168.126.128。点击Layer Preview，找到自定义创建存储，点击 OpenLayers 按钮，就可以看到已有自定义地图。温馨提示：可以使用在postgis下载postgis-bundle工具，导入shp文件到postgis。来源： oschina 链接： https://my.oschina.net/u/1011130/blog/3036380

Domain Driven Design - how the layers should be organized?

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问题 I'm very much new to software development. I think layered architecture is a great way to reduce the complexities that arise in the process of object oriented software development and, not to mention, to keep your code organized. I'm interested to learn about Domain Driven Design approach and I've run into some problems to get myself introduced to it (of course, beginner level ones). Here it is - I want to build an application to save person related data in database and display person details

WinForm UI components layer order

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问题 When we add any UI or container in WinForms, the later added component comes over the earlier added components, we can say it is in a higher layer. How to change that layer order or component order after adding components? 回答1: Is it when you load components dynamically in code or in the designer? If it is in the designer you can use the Format -> Order -> Send to Back and Format -> Order -> Bring to Front commands. Send to Back and Bring to Front are also available in the context menu when

什么是trunk端口？

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什么是iis7服务器监控工具Trunk端口基本概念 Trunk类型的端口可以允许多个VLAN通过，可以接收和发送多个VLAN的报文，一般用于交换机之间连接的端口；处理流程 trunk端口收报文：收到一个报文，判断是否有VLAN信息，如果没有则打上端口的PVID，并进行交换转发；如果有判断该trunk端口是否允许该 VLAN的数据进入：如果允许则报文携带原有VLAN标记进行转发，否则丢弃该报文。 trunk端口发报文：比较端口的PVID和将要发送报文的VLAN信息，如果两者相等则剥离VLAN信息，再发送，否则报文将携带原有的VLAN标记进行转发。总结 1、Access 端口可接受并转发的数据来源： 1）来自PC的无VLAN信息数据包； 2）从一个Access口入打上VLAN标记在交换机内转交给相同VLAN的access口去掉标记的无VLAN信息数据包； 3）Access 端口发送出去的数据包无VLAN信息，可被PC接受或Access口接受。示例：上图中，pc1不能ping通pc2，因为同一交换机内从pc1进入交换机A的access口的数据包被打上了VLAN10的标记，而和pc2相连的access的是VLAN20，从上面总结的2）条不满足，无法ping通。同理，pc1和pc3也不能ping通。上图中，pc2和pc3能互ping通

IText edit or remove the layer on PDF

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问题 H All, I am Using IText for adding text layers on PDF. Now i want to edit the existing layers on the PDF, layers are also created by IText only. Seems IText dont have such methods to suppport. I thought of other way around is remove existing Layer and place new layer on its place. Seems remove also not supported by IText. Any way todo these? Thanks in adavance. 回答1: As it turned out in comments, the layers in question are what iText indeed calls layers but what actually in PDF lingo is called

How to maintain multi layers of ImageViews and keep their aspect ratio based on the largest one?

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Suppose I have multiple Images that I need to put one on top of the other, some might have some kind of animation appearing and some might even be draggable. the largest one which usually takes the whole screen would be the bottom in the Z-coordinate (let's call it the backgroundImageView ), while all of the rest appear on top of it (and on top of others). like so: backgroundImageView imageView1 , centered. imageView2 , at 60%,60% of the top left corner ... If I use a FrameLayout (which seems like the best solution), the backgroundImageView would have its size fit nicely, but how can I force

SetPixel is too slow. Is there a faster way to draw to bitmap?

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问题 I have a small paint program that I am working on. I am using SetPixel on a bitmap to do that drawing of lines. When the brush size gets large, like 25 pixels across there is a noticeable performance drop. I am wondering if there is a faster way to draw to a bitmap. Here is a bit of the background of the project: I am using bitmaps so that I can utilise layers, like in Photoshop or The GIMP. Lines are being drawn manually because this will eventually use graphics tablet pressure to alter the