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SVG & DOM Manipulation via Javascript

Learn about SVG as an alternative to <canvas> and WebGL for 2D graphics in the browser. Explore SVG usage, XML-based syntax, creating shapes, formatting with CSS, animation, and abstract animation concepts.

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SVG &amp; DOM Manipulation via Javascript

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  1. SVG & DOM Manipulation via Javascript IGME 230 Fall 2016

  2. SVG (scalable vector graphics) alternative to <canvas> and WebGL for 2D graphics in the browser.

  3. SVG : where is it used?

  4. SVG = XML They look like HTML, but behave a bit differently.

  5. Drawing shapes <!-- start tag and size attributes --><svg width='500' height='500'><!-- draw some stuff --><circle id='d' cx='100' cy='100' r='50' /><circle id='e' cx='200' cy='200' r='25' /></svg><!-- end tag -->

  6. Formatting (with CSS) <style> #d {fill: red;stroke-width:10;stroke:green; }</style><svg width='500' height='500'><circle id='d' cx='100' cy='100' r='50'/><circle id='e' cx='200' cy='200' r='25'/></svg>

  7. SVG Element Reference

  8. JavaScript and SVG Assuming a single SVG that fills the screen, draw one rectangle var xmlns ='http://www.w3.org/2000/svg';var svg =document.querySelector('svg');var rect =document.createElementNS(xmlns, 'rect');rect.setAttribute('x', 0 );rect.setAttribute('y', 0 );rect.setAttribute('width', 40); rect.setAttribute('height', 40); svg.appendChild( circle );

  9. JavaScript and SVG Assuming a single SVG that fills the screen, draw a hundred randomly sized, randomly colored red circles. var xmlns ='http://www.w3.org/2000/svg';var svg =document.querySelector('svg');var circles =[];for(var i =0; i <100; i++){var circle =document.createElementNS( xmlns, 'circle'); circle.setAttribute('cx', Math.random()*window.innerWidth ); circle.setAttribute('cy', Math.random()*window.innerHeight ); circle.setAttribute('r' , Math.random()*40); svg.appendChild( circle );};

  10. Animating SVG elements Assuming a single SVG that fills the screen, draw a thousand randomly sized, randomly colored circles that move across the screen. • Create helper functions that randomly color, position, and set the speed of individual circle elements. • Create a thousand circle elements and store them in an array • Call our helper functions on each item our array of circles to create variation between individual elements • Create a function to move a single circle according to its speed • 60 times per second, call our circle moving function on every circle in our array.

  11. ICE: Abstract Animation Create an abstract animation. Use at least four different types of SVG elements in your composition. All SVG elements (with the exception of the container <svg> tag) should be dynamically added via JavaScript. Try to create at least two different “scenes”, moments where the animation changes in a significant way. Place the resulting HTML file (and any external resources if needed) on Banjo and provide a link from your homepage.

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