Home > Developer > JavaScript

How to draw lines between two points in js

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

How to draw lines between two points in js

This article describes how to draw lines between two points in JavaScript. Share it with you for your reference. The specific analysis is as follows:

I have been bored recently. I have been thinking about it for a long time and thought of the idea of killing time, that is, the js version of continuous viewing.

Draw a line between two points is only part of the most basic function of the link, so the line I draw is only a line, but also can only fold to the left, the line direction will be determined based on the position of the picture in the continuous view.

?

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

<! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN"

Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd>

<Html xmlns = "http://www.w3.org/1999/xhtml">

<Head>

<Meta http-equiv = "Content-Type" content = "text/html; charset = gb2312"/>

<Title> draw a line between two points </title>

<Style type = "text/css">

Body {

Font-size: 12px;

}

</Style>

</Head>

<Script type = "text/javascript">

<! --

Var dot = new Array ();

Document. onmousedown = function ()

{

// Delete a div if it exists

If (document. getElementById ('line _ div ')){

Var clearDiv = document. getElementById ("line_div ");

ClearDiv. parentNode. removeChild (clearDiv );

}

// Create an event when you press it.

If (! A) a = window. event;

// Obtain the X and Y axes

Var x = a. clientX;

Var y = a. clientY;

// When the array length is greater than or equal to 4, clear the Array

If (dot. length> = 4) dot. splice (0, 4 );

// Add x and y to the array. The array stores two sets of coordinate values, which are equivalent to two points on the page: A (x1, y1) and B (x2, y2 ).

Dot. push (x, y );

// Draw a line when the array length is 4.

If (dot. length = 4 ){

// Calculate the length and width of the div

Var width = Math. abs (dot [0]-dot [2]);

Var height = Math. abs (dot [1]-dot [3]);

// Locate the specific position in the upper left corner of the div on the page

Var left = dot [0]-dot [2] <0? Dot [0]: dot [2];

Var top = dot [1]-dot [3] <0? Dot [1]: dot [3];

// Create a div

Var div = document. createElement ("div ");

Div. innerHTML = '<div id = "line_div" style = "width:' + width + 'px; height: '+ height + 'px; position: absolute; visibility: visible; left: '+ left + 'px; top:' + top + 'px; border-left: 1px solid # cdcdcd; border-top: 1px solid # cdcdcd; "> </div> ';

Document. body. appendChild (div );

}

}

-->

</Script>

<Body>

</Body>

</Html>

I hope this article will help you design javascript programs.

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
how to find difference between two dates in php draw lines how to comment multiple lines in php how to comment multiple lines in python how to separate lines in html how to comment multiple lines in unix how to comment multiple lines in html
Related Article
JavaScript solution to the eight Queens Problem method summar...
The difference between single and double quotes in JavaScript...
Http status code: 301, 302 redirection, 302 redirection
The html space symbol nbsp; ensp; emsp; introduces and implem...
Ajax and 302 response code Testing
Ajax and 302 response code test_javascript-js tutorial

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

What's Trending
Top 10 Tags
datastax versions naming convention zookeeper client class definition md5 microsoft sql server 2005 data structures exception handling error handling
Top 10 Keywords
microsoft download center down wordpress address url site address url wordpress address url windows installer 4 0 download 302 not found web address url definition site address url wordpress db2 integer mac os installation step by step pdf abbreviation for return

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    Open a Ticket

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

    Learn More