javascript canvas draw

I haven't written a blog for almost half a year. Some people may have known that the canvas element is determined by the W3C html5.0 solution. Unfortunately, ie does not support this element,Firefox supports this element in earlier versions. Below are some browsers that support Canvas Element preview. Firefox Safari Opera Assumercanvas 2.0 ○ 2.0 ○ 9.2

1. Basic usageTo use the Using the Todataurl () method, you can export an image drawn on the var Drawing=document.getelementbyid ("drawing");//determine browser support 2.2D context(1), fill, and strokeFill: Fills the shape with the specified style; stroke: simply draw a line at the edge of the graphic. The values of the two properties of FillStyle and Strokestyle can be strings, gradient objects, or pattern objects.var Drawing=document.getelementbyid

Last week we spent half a day developing the next app that was ready to be put into Mozilla marketplace. One application is now very hot, that is, Instagram,facebook spent 1 million of dollars to buy it. We also wanted to have $1 million in my pocket, and I decided to develop an Instagram-style app, which I'll show you how to copy a picture into a canvas, and in turn, how to save the canvas content in a pic

(); C.translate (center.x, CENTER.Y); C.rotate (3/2*MATH.PI); C.rotate (H*hourangle); C.beginpath (); C.moveto (0, 0); C.lineto (hourhandlength, 0); C.stroke (); C.restore (); }; /* Draw the Minute hand (M: current) * * This.drawminhand = function (m) { m = m = = 0? 60:m; C.save (); C.translate (center.x, CENTER.Y); C.rotate (3/2*MATH.PI); C.rotate (M*minangle); C.beginpath (); C.moveto (0, 0); C.lineto (minhandlength, 0); C.strok

('canvas _ dp '), context = canvas. getContext ('D'), image = new Image (), // document. getElementById ('myimg '), imageData, scale, // scaling ratio: rubberbandRectangle = {left:, top:, width:, height:}, resize =; oldRubberbandRectangle = {}; dragging = false, extending = false, mousedown ={}; // Functions .. ........................................ ........... Function windowToCanvas (

This is just a simple JavaScript and HTML5 applet, did not realize the Man-machine battle.A two-dimensional array of gobang checkerboard drop points. The elements of the array correspond to drop points. For example, an array element value of 0 means that the element corresponding to the drop point does not have a pawn, the array element value of 1 means that the element corresponding to the drop point has a white pawn, the array element value of 2 mea

Because these two years HTML5 fire's positive heat, therefore studied a bit, recently had an idea also to use the related function which the HTML, therefore also must study well. Take a good look at the function of canvas, feel HTML5 in the client interactive function more and more strong, today looked at the canvas drawing, below is a few examples, write down for later use. 1, using

Javascript + html5: canvas: The method for drawing the empty font text of a volume, This document describes how to use JavaScript + html5 to draw empty text in the canvas. Share it with you for your reference. The specific implementation method is as follows: I hope this

For H5, canvas can be said to be its most characteristic of a place, with it after we can freely in the Web page to draw a variety of graphics, do some small games ah what. Canvas the use of this label, there are a lot of tutorials on the web, there is no introduction. Today we use canvas to make a small clock. The com

Canvas Draw Rectanglevar drawing = document.getElementById (' drawing '); if (Drawing.getcontext) {var context = Drawing.getcontext (' 2d ');// Draw Rectangle Context.fillstyle = ' #0000ff '; Context.fillrect (10, 10, 50, 50);//Draw Translucent red rectangle Context.fillstyle = ' Rgba (255,0,0,0.5) ' ; Context.fillrect

In this article, we will share with you how to use limited code to draw an octal diagram, which is an assessment of your understanding of javascript. We recommend it to you here for your reference. One statement: Build a 1024*1024 color matrix with limited code to show you the beauty of programming and art. It originated from a problem on stackexchange. Here we made a slight extension to support more progr

Maybe you've seen HTML5 pictures broken animation effects, the principle of implementation is quite simple. But you should not have seen the video can also be broken into a reorganization, this HTML5 animation is to use the relevant characteristics of canvas, to achieve the click of the mouse to make video fragmentation reorganization effect. Click the mouse in the video area, you can let the video of the area broken, after a period of time, the broke

I have been paying attention to Zhao's jscex for a long time. jscex uses the infinite possibilities of eval (str), from "$ async" to "async", and never supports if else or if else ·, jscex is constantly being improved and optimized. Jscex can be fully invested in the production environment. I finished talking about pi yesterday. Let's draw a circle today! In a browser that supports html 5Run the following code: > html> body> canvasid="my

Code:functionCreateseal (id,company,name) {varCanvas =document.getElementById (ID); varcontext = Canvas.getcontext (' 2d '); //draw a seal border varWIDTH=CANVAS.WIDTH/2;varHEIGHT=CANVAS.HEIGHT/2; Context.linewidth=7; Context.strokestyle= "#f00"; Context.beginpath (); Context.arc (Width,height,110,0,math.pi*2); Context.stroke (); //Draw a PentagramCreate5star (context,width,height,30, "#f00", 0); /

On Weibo, we can rotate the picture to the left and turn right, so that the user can appreciate the picture effect from different angles. This article will combine examples to explain how you can use JavaScript to combine related techniques to achieve a picture's rotation effect. We use the HTML5 canvas tag to rotate the picture, and for ie6,7,8 browsers that do not support HTML5, we use IE's unique filter

The rotation of the picture can be said to be an effect, but the gradual rotation has not only belong to the visual effects of that category, it is more functional, functionality. Photos sometimes need to be taken sideways, and we need to rotate when we preview or share them on the web. In the past, this operation may have been more to the software to complete, and then rotated to the normal angle of the picture published to the web. On Weibo, we can rotate the picture to the left and turn righ

To obtain the image of the img tag on the UIWebView page, you can obtain the URL and download it again. The image consumes traffic, time, and cannot pass verification. Here we use the stringByEvaluatingJavaScriptFromString function of UIWebView to execute a javascript code and return the image to be obtained from the img tag on the UIWebView page. The method on the Internet is to obtain the URL and download it again, traffic consumption and time consu