javascript canvas draw

URL of the Dataurl format is obtained from the File,blob object, and then the dataurl image data is drawn to the canvasfunction (dataurl){ varnew Image(); function(){ canvas.drawImage(img); }; img.src = dataurl;});Different methods are used to construct different types of URLs (Dataurl, Objecturl (Bloburl), Filesystemurl, respectively). This is not described here, but only in the case of Dataurl.Filesystemurl does not refer to the form of a local file URL (file:///...), but r

This component allows you to draw arrows Based on the coordinate at the start and end of arrows. Currently, you can set the arrow shape (size and angle) for the widget ). Example: Put the following code directly: Arrow. js /*** Implement the function of drawing arrows between two points * @ author mapleque@163.com * @ version 1.0 * @ date 2013.05.23 */; (function (window, document) {if (window. mapleque = undefined) window. mapleque ={}; if (window

, 1, 2, 3, 4, 5, 6, 7, 8]; function Start () { var guess = new Array (); var count = 0; while (Count var temp = parseint (Math.random () * 54) + 1; for (var i = 0; i if (temp = guess) {//If you repeat, do not temp = 100; break; } } if (temp!= 100) { Guess[count] = temp; Data[count] = new Image (); data[count].src = "images/" + temp + ". gif"; count++; } } } function Draw () { canvas = docum

, SRC is Dataurl, and the picture onload is drawn to the canvasvar img = new Image();img.onload = function(){ canvas.drawImage(img);};img.src = dataurl;File,blob picture file data is drawn to canvasConvert to a URL first, then construct the image object, SRC is Dataurl, and the picture onload is drawn to the canvasUsing the Readblobasdataurl function above, the URL of the Dataurl format is obtained from the File,blob object, and then the dataurl image data is drawn to the canvasfunction (dataurl

This article mainly introduces the use of js to draw geometric graphics series of tutorials in the painting tangent, very convenient we have a good understanding of javascript, it is recommended to everyone example: http://www.zhaojz.com.cn/demo/draw9.html The code is as follows: // Draw the tangent// Point a point outside the circle// Dot Center// R radiusFun

This article mainly introduces the use of js to draw geometric graphics series of tutorials in the painting tangent, very convenient we have a good understanding of javascript, it is recommended to everyone example: http://www.zhaojz.com.cn/demo/draw9.html The Code is as follows: // Draw the tangent// Point a point outside the circle// Dot Center// R radiusFun

This article mainly introduces the beautiful circle Effect Based on canvas, and analyzes the dynamic graph rendering techniques of JavaScript and html5 canvas in the form of a complete example, if you need it, refer to the example in this article to describe the beautiful circle Effect Based on canvas. We will share th

This is a simple drawing application implemented on canvas using javascript. You can draw images in the following area using a html5-supported Browser: Your browser does not support canvas! The function is very simple. The principle is similar to that of drag-and-drop. There are mainly three events: 1. Bind The mousedo

Sample Example: Less nonsense, directly on the code: Arrow.js /** * To achieve the function of two-point arrow @author mapleque@163.com * @version 1.0 * @date 2013.05.23/;(function (window,document) {if ( window.mapleque==undefined) window.mapleque={}; if (window.mapleque.arrow!=undefined) return; /** * Component External interface/var proc={/** * Receive Canvas object, and on this draw arrow (

their locations with canvas? then I click download to download the image to a local device. 3. or what php plug-in can be used to achieve stroke? Reply content: Stroke size can be set Currently, the QR code is automatically generated in the background, and text is also automatically generated. it has been integrated in the center of the image by css. The code structure is as follows: I am a stroke font The style of print.css is as follows:

A complete example of the arc swing effect drawn by JavaScript + html5 canvas, html5canvas This article describes how to swing an arc drawn by JavaScript + html5 canvas. We will share this with you for your reference. The details are as follows: The running effect is as follows: The Code is as follows: