line

问题 I have an a line and plane in 3D space. I want to place plane's width and length line as perpendicular by line. Please see my jsFiddle. I am newbie at both three.js and vector calculation. Current 2. Desired result Please advice me. (Apologies for my bad English) JS code: let renderer; let camera; let controls; let scene = new THREE.Scene(); camera = new THREE.PerspectiveCamera(54, window.innerWidth / window.innerHeight, 0.1, 1000); renderer = new THREE.WebGLRenderer({ antialias: true });

问题 I have an a line and plane in 3D space. I want to place plane's width and length line as perpendicular by line. Please see my jsFiddle. I am newbie at both three.js and vector calculation. Current 2. Desired result Please advice me. (Apologies for my bad English) JS code: let renderer; let camera; let controls; let scene = new THREE.Scene(); camera = new THREE.PerspectiveCamera(54, window.innerWidth / window.innerHeight, 0.1, 1000); renderer = new THREE.WebGLRenderer({ antialias: true });

问题 I've been trying to carry out line simplification on polygons belonging to maps with the help of this CGAL guide, e.g. South Korea. This is a screenshot of South Korea after line simplification with CGAL. I carried out the line simplification by adding each polygon to CGAL::Constrained_triangulation_plus_2<CDT> ct and then running CGAL::Polyline_simplification_2::simplify(ct, Cost(), Stop(0.5)); . The outer boundaries will get simplified but the inner/shared boundaries (between provinces)

问题 I am trying to make it such that when I click a QPushButton a line is drawn. However the code I have right now makes the line at the beginning when the code is initiated and not after . The QPushButton doesn't seem to do any drawing. I also don't quite understand why when drawing you need an 'event' argument in the function. import sys from PyQt5 import QtCore, QtWidgets from PyQt5.QtWidgets import QMainWindow, QGridLayout,QPushButton, QApplication, QWidget from PyQt5.QtCore import QSize,

问题 I was wondering if there is a way to create linestring from two points given in the same row in a dataframe in a new geometry column. In other words longitudes and latitudes of the two points are given in a dataframe like the following: df <- data.frame(id = c("a", "b"), lon1 = c(1,2), lat1 = c(3,4), lon2 = c(5,6), lat2 = c(7,8)) where lon1 and lat1 represent the coordinates of the first point and lon2 and lat2 are the coordinates of the second point. The desired dataframe would have two rows

问题 I'm making simple Node.js app and I need to delete first line in file. Please is any way how to do it? I think that It will be possible with fs.write, but how? 回答1: Here is streamed version of removing first line from file. As it uses streams, means you don't need to load whole file in memory, so it is way more efficient and fast, as well can work on very large files without filling memory on your hardware. var Transform = require('stream').Transform; var util = require('util'); // Transform

问题 I have a csv-file, now i need to bring it in another form. I want to have a line break \r\n after a specific pattern. All patterns look like this: true or false; int number between 0 and 100; decimal number with two or three digits after the point; true or false; For example: false;2;23.987;false; true;0;8.37;false; false;8;166.987;false; and after the last semicolon, i want to have a line break. I am using notepad++. Thanks for your help 回答1: You may use \b(?:true|false);\d+;\d+\.\d+;(?:true

问题 I have a csv-file, now i need to bring it in another form. I want to have a line break \r\n after a specific pattern. All patterns look like this: true or false; int number between 0 and 100; decimal number with two or three digits after the point; true or false; For example: false;2;23.987;false; true;0;8.37;false; false;8;166.987;false; and after the last semicolon, i want to have a line break. I am using notepad++. Thanks for your help 回答1: You may use \b(?:true|false);\d+;\d+\.\d+;(?:true

问题 I have a csv-file, now i need to bring it in another form. I want to have a line break \r\n after a specific pattern. All patterns look like this: true or false; int number between 0 and 100; decimal number with two or three digits after the point; true or false; For example: false;2;23.987;false; true;0;8.37;false; false;8;166.987;false; and after the last semicolon, i want to have a line break. I am using notepad++. Thanks for your help 回答1: You may use \b(?:true|false);\d+;\d+\.\d+;(?:true

问题 I want to draw line from unityUI. (i dont want to use Line Renderer in unity). So I figured out the coding below, but my problem is the line sizes are not constant. public class MyUILineRenderer : Graphic { public Vector2[] pointPos; public float[] angles; public MyUIGridRenderer gridRenderer; public Vector2Int gridSize = new Vector2Int(1, 1); public float lineThickness = 0.5f; public float width; public float height; public float unitWidth; public float unitHeight; public float angleHelp;