cairo | 易学教程

Putting .SVG images into tkinter Frame

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问题 I have been trying to put the image from https://betacssjs.chesscomfiles.com/bundles/web/favicons/safari-pinned-tab.f387b3f2.svg into a Tkinter frame. I found from the post here that it is possible with the help from rsvg and cairo. I was using python 3.6 on Windows 10. I got rsvg from here and cairo from here and then extracted the folders to the 'C:\Users...\site_packages' folder. They import fine but I cannot figure out how to use them. I tried using the code: import tkinter as tk main=tk

Module 'cairo' has no 'ImageSurface' member

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问题 When I am trying to execute this example, I am getting problem messages like: Module 'cairo' has no 'FORMAT_ARGB32' member Module 'cairo' has no 'ImageSurface' member Module 'cairo' has no 'Context' member Module 'cairo' has no 'LinearGradient' member What is the problem here? I am using python version '3.9.0' and pycairo version '1.20.0' 来源： https://stackoverflow.com/questions/64886845/module-cairo-has-no-imagesurface-member

Module 'cairo' has no 'Context' member

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问题 When I am trying to run this example, I am getting the following problem messages: Module 'cairo' has no 'ImageSurface' member Module 'cairo' has no 'Context' member Module 'cairo' has no 'FORMAT_ARGB32' member What is the problem here? 来源： https://stackoverflow.com/questions/64880743/module-cairo-has-no-context-member

Why do Greek letters fail to render in R's (v4) PDF output?

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问题 I am trying to export a simple plot to PDF from R, with a Greek letter, like this: cairo_pdf("test.pdf") barplot(1, main = "\u03C1") dev.off() I am on an OpenSUSE LEAP 15.1 system with R 3.5 preinstalled - this works fine. So the necessary fonts must be installed. However, in R 4.0.3 (which I compiled myself), the same command yields a box instead of the Greek letter: (Interestingly, copy-and-pasting this box inserts the correct Greek letter.) Is this a fundamental difference between R v3 and

Why do Greek letters fail to render in R's (v4) PDF output?

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[翻译]PyCairo指南--变换

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变换 PyCairo 图形学编程指南的这个部分，我们将讨论变换。一个仿射变换由0个或者多个线性变换(旋转，放缩或切变)和平移(移位)组成。一些线性变换可以被结合起来放进一个单一的矩阵中。一个旋转是将一个精确的对象沿着一个固定的点做移动的变换。一个放缩是将对象进行放大或缩小的变换。放缩系数在所有方向上都是一致的。一个平移，是在一个特定的方向上，将每一个点都移动固定的距离的变换。一个切变是一个将一个对象正交的移动向给定的轴，同时保持轴某一侧的值比另一侧更大的变换。来源: (wikipedia.org, freedictionary.com) 平移下面的例子描述了一个简单的平移。 def on_draw(self, wdith, cr): cr.set_source_rgb(0.2, 0.3, 0.8) cr.rectangle(10, 10, 60, 60) cr.fill() cr.translate(30, 30) cr.set_source_rgb(0.8, 0.3, 0.2) cr.rectangle(0, 0, 60, 60) cr.fill() cr.translate(60, 60) cr.set_source_rgb(0.8, 0.8, 0.2) cr.rectangle(0, 0, 60, 60) cr.fill() cr.translate(70

Cairo and Qt integration

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来源： https://stackoverflow.com/questions/1639895/cairo-and-qt-integration

Cairo and Qt integration

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来源： https://stackoverflow.com/questions/1639895/cairo-and-qt-integration

VBA基础七：字典

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借花献佛：一、定义字典 Set d = CreateObject("Scripting.Dictionary") 二、呼之即来，挥之即去 d("张三“)=1 '相当于给字典赋值，张三过来（没有就生成）拿个1站一边去 d("李四”)=2 '相当于给字典赋值，李四过来（没有就生成）拿个2站一边去 d("李四”)=3 '相当于改变值，字典中已经有李四了，李四跑过来，丢下2换个3站一边去注：这时字典中有两个人的存在，张三＝1 和李四＝3，相当于实现了去重复的功能 s=d("张三") 's=1 即叫了声张三，张三就告诉你他拿的是1 s=d("李四") 's=3 即叫了声李四，李四就告诉你他拿的是3 s=d("麻子") 's="" 没有找到麻子怎么办呢，字典里就自动生成一个麻子d("麻子") ＝“”，告诉你他手上是空的注：这时字典中有三个人的存在，张三＝1 ; 李四＝3;麻子＝“” 三、将字典里的东西变成数组 arr= d.Keys '把名字的集合按先来后到的原则放到一维数组里 arr(0)＝“张三” ; arr(1)＝“李四” ; arr(2)＝“麻子” arr1=d.Items '把名字对应的值的集合按先来后到的原则放到一维数组里 arr1(0)＝“1” ; arr1(1)＝“3” ; arr1(2)＝“” 四、查找字典中有没有这个人 s=d.Exists(“张三”) 's

Windows 常用设置

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Windows 卸载UWP应用卸载命令【管理员身份运行PowerShell】有部分应用无法使用这个方式卸载，所以能通过这种方式卸载的应用，理论上都不会对系统造成影响闹钟 get-appxpackage *Microsoft.WindowsAlarms* | remove-appxpackage 相机 get-appxpackage *Microsoft.WindowsCamera* | remove-appxpackage Groove Music get-appxpackage *Microsoft.ZuneMusic* | remove-appxpackage Maps get-appxpackage *Microsoft.WindowsMaps* | remove-appxpackage 照片 get-appxpackage *Microsoft.Windows.Photos* | remove-appxpackage 人脉 get-appxpackage *Microsoft.People* | remove-appxpackage Firefox 修改渲染 gfx.content.azure.backends : direct2d1.1,cairo,skia 来源： oschina 链接： https://my.oschina.net/u/3135584/blog