html5 canvas clock

Recently on the Internet to see a CSS3 implementation of the lovely clock, feel very nice, and then want to use canvas to try to achieve this clock effect.First, the clock needs to be calculated first to calculate the size of the entire circle.Because a circle is 360 degrees, so the number is 360/12=30, so the code tha

HTML5 website http:// This scenario is mentioned in diveintohtml5.org:The code is as follows: function Canvassupport () { return!! Document.createelement (' canvas '). GetContext; } function Canvasapp () { if (!canvassupport ()) { return; } } Our favorite approach is to use the Modernizr.js library (found in http://www.modernizr.com). Modernizr is an easy-to-use lightweight JavaScript library

+pathradius* (i) *math.cos (Angle),canvas.height/2+pathradius* (i) *math.sin (Angle), circleradius,0,math.pi*2,true);Set RGB values for changesContext.fillstyle = ' rgb (' +rgb+ ', ' +math.floor (RGB/4) + ', ' + (255-RGB) + ') ';Context.fill ();}}}function Draw () {Erase the result of the last drawing circle so that the change of the small circle seems to be dynamicIf you do not understand, comment out the following line, and then look at the effectContext.clearrect (0,0,canvas.width,canvas.heig

This article mainly introduces some new HTML5 features and the sorting of common Canvas attributes. CanvasAPI is an important part of HTML5 for drawing graphics. For more information, see 1. HTML5 content type Content type Description Embedded Add other types of content to the document,

Drawing stepsget the canvas objectvar Ocanvas = document.getElementById ("Canvas");Get Contextual contextvar context = Ocanvas.getcontext ("2d");Draw a graphicSelect a method based on demandDraw Rectangle / border / fill colorcontext.linewidth=1;Context.fillrect (X,y,width,height);Context.strokerect (X,y,width,height);HTML> Head> MetaCharSet= "UTF-8"> title>

Canvas clock, First step. Then var c=document.getElementById("myCanvas"); var ctx=c.getContext("2d"); Define a function that draws a clock every second by using a timer. By default, a function name is called once and then called by a timer. Because if you start calling the timer directly, it will be 1 s slower than the actual time. drawfun();setInterval(drawfu

+ Rectangle width/2, round y= rectangle y+ Rectangle Height/2. So they are absolutely aligned.Although ARC does not have a direct drawing of the method so good-I imagine the direct drawing of the method only need 3 parameters, that is, the center of the coordinates of the radius-but arc can not only draw a circle, but also can draw semicircular what, so the function is more powerful, use also will.Since there is a circle, there should be an ellipse, but there is not even a formal circle function

Javascript + html5: How to Use canvas to draw empty text in a canvas 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: ? 1 2 3 4 5 6

A Canvas implemented by Javascript HTML5 Canvas, html5canvas This article provides an example of a Canvas Code implemented by HTML5 Canvas for your reference. The details are as follows: The above is all the content of this artic

We all know how to draw a static picture (JPEG, PNG, etc.) on a canvas canvas of HTML5, and just use the DrawImage method in canvas, so how do I draw a motion picture (GIF)? I believe we all know that the dynamic picture is dynamic, because it is a lot of pictures in a certain number of frames in order to play, so we c

Javascript HTML5 canvas implements brick-hitting games and html5 brick-hitting games This example shows a small game, based on the canvas in HTML5. The game is mainly used to bounce a small ball and hit a small square. In the code, we mainly implement the generation of small

The company's mobile page, upload pictures when the thumbnail is generated by the back-end, but with the current mobile phone more and more cattle x (camera than the digital camera is also fierce ~), the picture volume is also getting larger. A few m of the graph, maybe we just used to generate a 100*100 small map, upload to the back end and then generate thumbnails is greatly wasted, and the waiting time to submit the form is not long, the user experience is not good. Ordinary Web Forms, uplo

Currently, HTML5 is favored by many industry giants. Many Web developers are also trying to useHTML5To create various Web applications. The HTML5 specification introduces many new features. One of the most promising features is the Canvas Element.JavaScriptThe method of drawing a graph is very powerful. Today, this article collects 20 amazing

HTML5 clock, html5 Instance: http://download.csdn.net/download/l294333475/7941639 The color of the Code in the html5 clock remains unchanged. Set a style for the body tagHow to make a clock in html

H5+canvas Drawing an animated clock, this is, can move,The code is as follows:Summarize:There are several ways to note:1,ctx.save (); Ctx.restore (); Two methods for painting complex graphics,2,ctx.translate (140, 140); set (140,140) as relative reference origin (0,0)3,ctx.rotate (-MATH.PI/2); rotation angle, because the 0° angle is to the right, we need 0 points when the angle is -90°, so rotate the angle

the same.Now draw an S-shaped curve to prove that Beziercurveto is different:The code is as follows:var x1 = 150In fact, just change the coordinates of the control point 1 a bit. If the coordinates of Control point 1 and Control point 2 are on both sides of the baseline, the curve of the S-shape is drawn, and if it is on one side of the baseline, it is similar to the Quadraticcurveto effect.The case is relatively simple, the base line (the starting point to the end point) is vertical, but most

HTML5 Development Notes: first glance at CANVAS, upload canvas images to the server, The project provides the image cropping function, which allows users to crop an image when uploading it, and select an appropriate size position as the Avatar. The crop. js plug-in is used, and canvas is used to directly draw the cropp

The example in this article describes how to delete a block area in the HTML5 canvas canvas. Share to everyone for your reference, specific as follows: The screenshot of the running effect is as follows: Attached: The black small square is the deleted block area in the picture The specific code is as follows: Index.html: Canvas.js: (funct

explore, the circle continues to grow, the starting point and the distance between the 1th shortened.The code is as follows:var // ... ctx.arcto (x1,y1,x2,y2,//Originally is a hook, now be abruptly bend, also broke to the opposite direction! It's kind of like a bottle rack.However, you see, this circle is still tangent to two lines! Just now the length of the two lines can not meet the circle! He's already wired up both lines!When does this hook handle reverse? If you have a good geometry, you

[Original] a canvas written based on the new html5 label canvas, html5canvas I recently learned canvas and wrote a small application exercise. Source code 1 Running Effect There are still some problems: The actual painting position is different from the mouse position when the browser location is changed. A breakpoin