geometry

Radius of projected sphere in screen space

由 蓝咒 提交于 2021-02-17 22:09:41
问题 I'm trying to find the visible size of a sphere in pixels, after projection to screen space. The sphere is centered at the origin with the camera looking right at it. Thus the projected sphere should be a perfect circle in two dimensions. I am aware of this 1 existing question. However, the formula given there doesn't seem to produce the result I want. It is too small by a few percent. I assume this is because it is not correctly taking perspective into account. After projecting to screen

How to find two points that form closest distance between two rectangles?

由 跟風遠走 提交于 2021-02-17 05:07:27
问题 I'm trying to find algorithm that will find two points that represent closest distance between two rectangles. Like points C and J that form smallest distance on image below: I'm trying to not reinvent the wheel here and use something that is already battletested like boost::geometry::distance, but it only return distance and not also the points. 回答1: Not making things overly generic (by assuming floating point coordinates and cartesian coordinate system), here's an implementation of point-to

How to find two points that form closest distance between two rectangles?

由 隐身守侯 提交于 2021-02-17 05:06:48
问题 I'm trying to find algorithm that will find two points that represent closest distance between two rectangles. Like points C and J that form smallest distance on image below: I'm trying to not reinvent the wheel here and use something that is already battletested like boost::geometry::distance, but it only return distance and not also the points. 回答1: Not making things overly generic (by assuming floating point coordinates and cartesian coordinate system), here's an implementation of point-to

How to find two points that form closest distance between two rectangles?

由 折月煮酒 提交于 2021-02-17 05:05:24
问题 I'm trying to find algorithm that will find two points that represent closest distance between two rectangles. Like points C and J that form smallest distance on image below: I'm trying to not reinvent the wheel here and use something that is already battletested like boost::geometry::distance, but it only return distance and not also the points. 回答1: Not making things overly generic (by assuming floating point coordinates and cartesian coordinate system), here's an implementation of point-to

ArcGIS JS API4.x的本地部署

由 允我心安 提交于 2021-02-16 22:27:41
1.下载ArcGIS API（编辑时最新版本为4.11） 下载地址 2.部署IIS 把下载的arcgis api 4.x 离线包解压拷贝到 C:\inetpub\wwwroot 目录下 配置 init.js 文件，修改里面的路径 C:\inetpub\wwwroot\arcgis_js_api\library\4.10\init.js ； init.js 文件里面，搜索 [HOSTNAME_AND_PATH_TO_JSAPI] ，然后替换成本机的部署路径 例如我的： http://localhost/arcgis_js_api/library/4.11/dojo 3.检测是否部署成功 编辑一个简单的例子检测是否部署成功。 1 <! DOCTYPE html > 2 < html > 3 < head > 4 < meta charset ="utf-8" /> 5 < meta 6 name ="viewport" 7 content ="initial-scale=1,maximum-scale=1,user-scalable=no" 8 /> 9 < title > Sketch in 3D - 4.11 已经完成 </ title > 10 11 < link rel ="stylesheet" href ="http://localhost/arcgis_js_api

Pinch/pucker an image in canvas

由 女生的网名这么多〃 提交于 2021-02-16 13:39:25
问题 How can I pinch/pucker some area of an image in canvas? I've made a solar system animation some time ago, and I started rewriting it. Now, I want to add gravity effect to masses. To make the effect visible, I turned the background into a grid and I'll be modifying it. Desired effect is something like this (made in PS) context.background("rgb(120,130,145)"); context.grid(25, "rgba(255,255,255,.1)"); var sun = { fill : "rgb(220,210,120)", radius : 30, boundingBox : 30*2 + 3*2, position : { x :

Oracle Ora 错误解决方案合集

由 我与影子孤独终老i 提交于 2021-02-16 12:28:45
注：本文来源于 《 Oracle学习笔记 --- Oracle ORA错误解决方案 》 ORA-00001: 违反唯一约束条件 (.) 错误说明：当在唯一索引所对应的列上键入重复值时，会触发此异常。 ORA-00017: 请求会话以设置跟踪事件 ORA-00018: 超出最大会话数 ORA-00019: 超出最大会话许可数 ORA-00020: 超出最大进程数 () ORA-00021: 会话附属于其它某些进程；无法转换会话 ORA-00022: 无效的会话 ID；访问被拒绝 ORA-00023: 会话引用进程私用内存；无法分离会话 ORA-00024: 单一进程模式下不允许从多个进程注册 ORA-00025: 无法分配 ORA-00026: 丢失或无效的会话 ID ORA-00027: 无法删去当前会话 ORA-00028: 您的会话己被删去 ORA-00029: 会话不是用户会话 ORA-00030: 用户会话 ID 不存在。 ORA-00031: 标记要删去的会话 ORA-00032: 无效的会话移植口令 ORA-00033: 当前的会话具有空的移植口令 ORA-00034: 无法在当前 PL/SQL 会话中 ORA-00035: LICENSE_MAX_USERS 不能小于当前用户数 ORA-00036: 超过递归 SQL () 级的最大值 ORA-00037:

《Java程序设计》 第四周学习总结

由 浪子不回头ぞ 提交于 2021-02-14 15:55:54
学号 20175313 《Java程序设计》第四周学习总结 教材学习内容总结 第五章主要内容 了解子类的继承性 子类和父类在同一包中的继承性（除private外其余都继承） 子类和父类不在同一包中的继承性（只继承public和protected） 掌握成员变量的隐藏和方法重写 成员变量的隐藏：注意与this的区别。 用关键字super对其进行操作。 通过调用从父类继承的方法对其进行操作。 方法重写：注意与方法重载的区别。 语法规则：这个方法的名字、参数个数、参数类型和父类的方法要完全相同，但是方法的类型可以是父类方法类型的子类。 重写目的：通过方法重写可以隐藏继承的方法，或是把父类的状态和行为改变成自身的状态和行为。 理解何为多态性以及如何产生多态 所谓多态就是指父类的某个方法被其子类重写时，可以各自产生自己的功能的行为。（后面的abstract会用到） 将子类创建的对象的引用放到一个父类的对象中，就得到了该对象的一个上转型对象，那么这个上转型对象在调用这个方法时就可能具有多种形态。 熟悉abstract的使用以及相关规则 对于abstract方法，只允许声明，没有方法体。 不允许用final和static修饰abstract类或方法。 abstract类不能用new运算符创建对象。但该对象可以成为其子类对象的上转型对象调用子类重写的方法。 学会面向抽象编程 目的

ROS入门学习（基于Ubuntu16.04+kinetic）

由 ≯℡__Kan透↙ 提交于 2021-02-13 16:35:18
本文主要部分全部来源于ROS官网的Tutorials. Setup roscore # making sure that we have roscore running rosrun turtlesim turtlesim_node rosrun turtlesim turtle_teleop_key # Now you can use the arrow keys of the keyboard to drive the turtle around. ROS Topics sudo apt-get install ros-kinetic- rqt sudo apt-get install ros-kinetic-rqt-common- plugins rosrun rqt_graph rqt_graph rostopic - h rostopic echo /turtle1/cmd_vel # you will now see topic datas when you press the arrow key in turtle_teleop_key terminal rostopic list -h # figure out what argument the list sub- command needs rostopic list -v # displays a

Building a spider-chart with turtle or tkinter

由 ♀尐吖头ヾ 提交于 2021-02-11 15:13:46
问题 I recently did 2 beginner courses in python coding at university for my Minor, which were followed by an intro to databases and a basic course about CRUD development in PHP. The python course was decent enough and touched on most of the basics. I've been trying to teach myself by making small applications to do things that I have to do for my remaining courses in linguistics. Now I wanted to write a small python application and that takes user input to create a Language profile for that
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