Text rotation in HTML5 plotting

Source: Internet
Author: User

Text rotation in HTML5 plotting
Text rotation in HTML5 plotting

Text rotation in GDI/GDI + is a relatively easy task. The rotation in HTML5 Canvas is slightly different from that in GDI/GDI +. First, let's look at a figure:

Sample Code of text Rotation
Ctx. beginPath (); ctx. fillStyle = "#000000"; ctx. font = "52pt Calibri"; ctx. textAlign = "center"; ctx. fillText (this. end, endX, endY); ctx. save (); ctx. translate (endX, endY); ctx. rotate (Math. PI/6); ctx. fillText ("text 2", 0, 0); ctx. restore ();
Code Description

The rotate of canvas is for the canvas. It can also be understood as the state machine of OPENGS, which is global for the canvas. Therefore, if you want to rotate the text at a specified position, first move the source of the image to this position, then rotate the canvas, and finally output the text at (0, 0). Remember that it must be (0, 0) location.

Related Article

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.

A Free Trial That Lets You Build Big!

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

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

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

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