Canvas vs SVG

By Xah Lee. Date: . Last updated: .

Here's a summary of differences of HTML5 Canvas and Scalable Vector Graphics (SVG).

What's the Difference Between Canvas and SVG

• Canvas is bitmap based, SVG is vector graphics tech. (this basically means, SVG graphics can be resized without getting fuzzy.)

• Canvas is just a bitmapped paint area. You use JavaScript to paint things on it. That's all it can do for you. For example, once you've drawn a circle, you can't just delete that circle. You have to draw something to cover up the circle. The circle isn't some object you can manipulate. It's just old paint on the wall. Everything in canvas is like this. Suppose if you want to know if user clicked on the circle. To do this, you have to calculate the click's coordinate, and you have to write code to check if mouse point is in the circle. Suppose you want to move the circle, then you have to draw something to cover up the old circle, and draw the circle again somewhere else. Canvas is very low level.

• SVG is XML. Each graphics element you created can be scripted with JavaScript for interactivity as part of XML/CSS/DOM. For example, onclick, onmouseover, ….

• The language of Canvas is low level and procedural, while SVG is declarative and higher level. In procedural style, you give commands to draw as if telling a paint brush where to move. In declarative style, you state your graphics shape and size.

// canvas.

// draw some lines
xx.moveTo(9,9);             // move point to
xx.lineTo(20,20);           // draw line to here
xx.strokeStyle = "#ff0000"; // specify color
xx.stroke();                // actually draw it
<!-- svg path element -->
<path d="M 0 0 L 50 0 L 0 50 L 90 90"
style="stroke:black; fill:yellow; stroke-width:5" />

• with Canvas, once a image is drawn, it's dead image, like paint on wall. With SVG, it's live: changes in code or object parameters are rendered in real-time.

• Canvas is relative new, part of HTML5. Canvas is invented by Apple in 2004 as proprietary tech to replace Flash, and is well supported in Apple's mobile devices. SVG started in 1999. All current browsers supports SVG, including IE9. (A light version of SVG is supported for years in mobile devices)

• SVG also supports bitmapped images.

What's Canvas Good For?

Because Canvas is very primitive, so it's fast. It is suitable for bitmapped games, such as DOOM, Quake, where all you want to do is painting the screen. (but as of , there's no robust 3D graphics (WebGL) support yet)

For chart, map, interactive illustration, board game, SVG is much more suitable.

Sample Animated SVG

Here's is a animated SVG.

soccer ball rotating
rotating soccer ball in SVG. image source

Works in all browsers as of .

SVG Tutorial

Practical SVG Tutorial

Canvas Tutorial

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