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How create a line with borders in HTML5 canvas properly

由 a 夏天 提交于 2021-01-29 16:26:40
问题 I want to draw a path of lines with borders in html, to render the streets in a map, but I could not find any standard way to do that, so I resourced to draw two superposed lines, the first one thicker than the second. The first attempt actually worked well: <!DOCTYPE html> <html> <body> <canvas id="myCanvas" width="1000" height="1000" style="border:1px solid #000000;"> Your browser does not support the HTML5 canvas tag. </canvas> <script> var c=document.getElementById("myCanvas"); var ctx=c

Three JS - why is line length equal to zero?

由 守給你的承諾、 提交于 2021-01-29 16:16:09
问题 New to three js. Exploring working with line segments. I'm trying to determine the length of a line. I'm using the computeLineDistances(); method to get the line length. The line is drawn along the x-axis ending at x=10. For some reason the log console returns a zero value. Does anyone have an explanation why the length returned in the console = 0; var myLength =0 ; //a line start point (0,0,0), end point (10,0,0) var points = []; // x, y, z points.push( new THREE.Vector3( 0, 0, 0 ) ); //

Three.js rope / cable effect - animating thick lines

由 南楼画角 提交于 2021-01-29 05:20:31
问题 With Three.js I want to create the effect of an object swinging from a cable or rope. It doesn't require real physics as the "swinging" object simply follows a fixed animation. The easiest solution is using the THREE.Line, however the problem is that THREE.Line can only be 1px thick and looks kinda awful. In the three.js examples there is a "fat lines" example : https://threejs.org/examples/?q=lines#webgl_lines_fat however the problem is that once I have created the line using LineGeometry()

In doxygen documentation how to create a link to a specific line of a file

由 匆匆过客 提交于 2021-01-26 08:05:12
问题 There are several doxygen commands whose purpose is to create links in the documentation (@link, @ref). I am currently using the @ref command to create a link to a custom file, written in a language not supported by doxygen (xml). I would like to alter this link so that it points to a precise line in the file. Is there a doxygen command that allows to do that ? 回答1: I'm not sure that \ref or \link can do this. However, if they could, one problem of adopting this approach is that the links

python - Draw a transparent Line in pygame

由 南笙酒味 提交于 2021-01-03 06:41:49
问题 I made a little game in which i need a background pattern with lines. Because of a better performance I would like to draw the pattern in python instead of taking an image. The problem is that I can't find a way to draw the lines with transparency...there are solutions for surfaces, but not for lines. here is the pattern code: import pygame from math import pi pygame.init() size = [600, 600] screen = pygame.display.set_mode(size) while True: for i in range(0, 600, 20): pygame.draw.aaline

python - Draw a transparent Line in pygame

由 孤人 提交于 2021-01-03 06:41:22
问题 I made a little game in which i need a background pattern with lines. Because of a better performance I would like to draw the pattern in python instead of taking an image. The problem is that I can't find a way to draw the lines with transparency...there are solutions for surfaces, but not for lines. here is the pattern code: import pygame from math import pi pygame.init() size = [600, 600] screen = pygame.display.set_mode(size) while True: for i in range(0, 600, 20): pygame.draw.aaline

python - Draw a transparent Line in pygame

由 坚强是说给别人听的谎言 提交于 2021-01-03 06:41:17
问题 I made a little game in which i need a background pattern with lines. Because of a better performance I would like to draw the pattern in python instead of taking an image. The problem is that I can't find a way to draw the lines with transparency...there are solutions for surfaces, but not for lines. here is the pattern code: import pygame from math import pi pygame.init() size = [600, 600] screen = pygame.display.set_mode(size) while True: for i in range(0, 600, 20): pygame.draw.aaline

R: connect points on a graph (ggplot2)

由 孤街浪徒 提交于 2021-01-01 09:26:53
问题 Suppose I have data in the following form: library(ggplot2) Data <- data.frame( "ID" = c("ABC111", "ABC111", "ABC111", "ABC111", "ABC112", "ABC112", "ABC112", "ABC113", "ABC113", "ABC114", "ABC115"), "color" = c("red", "red", "red", "red", "blue", "blue", "blue", "green", "green", "black", "yellow"), "start_date" = c("2005/01/01", "2006/01/01", "2007/01/01", "2008/01/01", "2009/01/01", "2010/01/01", "2011/01/01", "2012/01/01", "2013/01/01", "2014/01/01", "2015/01/01"), "end_date" = c("2005/09

How can I draw a pattern along a stroke or a path in svg?

由 假如想象 提交于 2020-12-30 02:14:48
问题 I need to draw pattern along SVG path. I tried using SVG markers but there is a problem with their orientation along the path. Is there any alternative way to accomplish this? If yes, what should be my approach? The expected result is something like this- 回答1: The idea to use unicodes for drawing chain links came at once, as I read the question. I searched for a suitable unicode character for a long time. Could not use the unicode character of the chain. The unicode character of the U+26D3 ⛓

How can I draw a pattern along a stroke or a path in svg?

由 杀马特。学长 韩版系。学妹 提交于 2020-12-30 02:13:55
问题 I need to draw pattern along SVG path. I tried using SVG markers but there is a problem with their orientation along the path. Is there any alternative way to accomplish this? If yes, what should be my approach? The expected result is something like this- 回答1: The idea to use unicodes for drawing chain links came at once, as I read the question. I searched for a suitable unicode character for a long time. Could not use the unicode character of the chain. The unicode character of the U+26D3 ⛓
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