Canvas - HTML 5
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The canvas element allows drawing graphics on a web page via scripting like JavaScript. It is supported by most modern browsers and uses a <canvas> tag with a script to access a drawing context. Common methods for drawing include beginPath(), moveTo(), lineTo(), and stroke() to draw lines, and the lineWidth and strokeStyle properties control the appearance of lines.
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This document discusses HTML5 features including new elements, CSS3, animation, touch events, JavaScript, and how to develop for smartphones. It covers topics such as new HTML5 elements, CSS3 transitions, animations and fonts, audio/video elements, the canvas element and 2D drawing, touch event handling, JavaScript APIs, and optimizing for mobile performance and limitations. The goal is to understand and utilize the latest web technologies to build engaging applications and sites, including for smartphones.
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- HTML5 is the 5th version of the HTML standard by the W3C and is still under development but supported by many browsers.
- HTML5 introduces new semantic elements, video and audio tags, 2D/3D graphics using <canvas>, and new JavaScript APIs for features like geolocation, offline web apps, and drag and drop.
- The document provides examples of using new HTML5 features like video playback, semantic elements, geolocation API, and drawing on a canvas with JavaScript.
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Html5 canvas
The document discusses HTML5 canvas, which allows drawing graphics on a web page using JavaScript. It provides a simple example of adding a <canvas> element to an HTML page with width and height attributes. The canvas initially appears blank, and a script is needed to access the rendering context to draw on the canvas. The document then lists examples of things that can be drawn on a canvas, such as rectangles, paths, lines, curves, images, gradients, text, patterns, and animations.
CANVAS, SVG, WebGL, CSS3, WebEvent
This document summarizes several web technologies including:
- HTML5 Canvas and 2D context for drawing graphics
- Scalable Vector Graphics (SVG) for 2D graphics
- WebGL for 3D graphics in the browser
- Cascading Style Sheets (CSS) for styling web pages
- Web Open Font Format (WOFF) for optimizing web font delivery
- Touch Events for detecting touch input on mobile devices
HTML5, the new buzzword
The document is a presentation about HTML5. It discusses what HTML5 is, some of the new elements it introduces like canvas, video, audio, and geolocation. It also covers new features like CSS3 media queries, web fonts using WOFF, and whether HTML5 is ready for use. The presentation encourages trying out HTML5 and provides some resources for learning more.
The canvas tag
The document discusses the <canvas> tag which allows drawing on an HTML page using JavaScript. It provides an example of drawing a red rectangle on a canvas and lists some of the capabilities of the <canvas> tag such as drawing primitives, transformations, and animation. The document concludes by providing contact information for Dave Ross who organized the meetup on the <canvas> tag.
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- 2. The HTML5 <canvas> element is used to draw graphics, on the fly, via scripting (usually JavaScript).
- 3. Browser Support • Internet Explorer 9+, Firefox, Opera, Chrome, and Safari
- 4. HTML5 Canvas Template <body> <canvas id="myCanvas" width="500" height="250"></canvas> <script> var canvas = document.getElementById('myCanvas'); var context = canvas.getContext('2d'); // do stuff here </script> </body>
- 5. • To draw a line using HTML5 Canvas, we can use the beginPath(), moveTo(), lineTo(), and stroke() methods.
- 8. HTML5 Canvas Line Width Tutorial • To define the width of an HTML5 Canvas line, we can use the lineWidth property of the canvas context. The lineWidth property must be set before calling stroke().
- 9. context.beginPath(); context.moveTo(100, 150); context.lineTo(450, 50); context.lineWidth = 15; context.stroke();
- 10. HTML5 Canvas Line Color // set line color context.strokeStyle = '#ff0000'; context.stroke();