Its nested stop elements define fairly abrupt gradations from the center towards the edge-from black to blue and then to white-followed by a more gradual transition to pink around the edge of the circle. The circle element’s fill attribute uses CSS’s url() function to reference the id of the radialGradient element.
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As an alternative, you can implement the entire eyeball as a large circle, within which a radial gradient builds a series of concentric rings: The concentric circles provide a good way to implement the edge of the iris and pupil, but are not good for the slight bloodshot color towards the edge of the eye. (See SVG deployment for different ways to apply CSS.) Applying a gradient Placing this CSS in the eyeballs.css file referenced from the HTML applies it to the slightly pared-down SVG markup that follows: #eyeball Īs you’ll see below, there are some cases where you want to avoid using style sheets.
Doing so actually takes precedence over the value of presentation attributes, so this example changes the eye color to brown: Īs in HTML, you can consolidate CSS within style sheets to separate it from markup. Since fill is a CSS property, You can also modify it locally via the style attribute. The fill property provides much the same capabilities in SVG as the background-color and background-image properties do for HTML. Some behave like CSS properties that you apply to HTML, but are named differently. Some, like font-size, apply to both SVG and HTML. Many CSS properties such as fill and stroke apply only to SVG content. Other than the tendency of longer CSS property names to use dashes-between-lowercase-words rather than camelCase for attribute names, there may be no way to tell the difference by looking at them. These are simply CSS properties that happen to be expressed as attributes. In this example, the id, cx, cy, and r are all ordinary attributes, while the fill and stroke are known as presentation attributes. (See SVG shapes for more about basic graphic elements such as circles, ellipses, rectangles, and polygons.) Styling via CSS Declaring the larger circles first prevents them from obscuring the smaller ones: To add the iris and pupil, you can add more circles that specify different fill colors. Adding a fill attribute allows you to color the background white, and a stroke attribute helps clarify the edge of the shape: The cx and cy attributes position its center point, and the r sizes it relative to that point: īy default, it’s filled black. (See SVG deployment for different ways to render SVG content.) The eyeballĪdding this line within the svg region produces a circle. You can add title and desc elements wherever necessary to comment your markup.
The basic markup looks like this, with an svg element encapsulating the graphics: SVG grand tour demo eyeballs interactive demo showcasing several SVG features Examples used throughout this guide feature inline SVG that’s directly embedded within HTML, which allows you to flexibly apply CSS and JavaScript to both the SVG graphic and the HTML content. There are several ways to deploy SVG, with various options outlined in the section at the bottom of this page.
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It focuses on the unique way you can build complex interactive graphics from reusable components, and how to flexibly resize them and place them within various drawing surfaces.Īs part of a grand tour to get a feel for SVG markup, you’ll stroll through an example that shows how to build a pair of eyes, and how to move them around and make them blink. It highlights some notable differences, and provides a quick tour of many SVG features that are covered in more detail in other sections. This section of the guide shows how SVG is deployed along with other core web standards, with which you should already be familiar. Since SVG renders within the browser’s DOM, each graphic component can be styled through CSS, manipulated with JavaScript through core APIs, and can appear comfortably within HTML pages. Use SVG if you want to freely interact with portions of a graphic. In contrast, raster or paint-style images consist of a series of pixels that may not display well when zoomed at high resolution. Vector or drawing-style graphics are implemented as pure shapes that render crisply at any magnification. SVG is a standard markup format, like HTML and XML, that renders Scalable Vector Graphics within web browsers. It shows how to maintain a set of reusable graphic components, and provides essential context on SVG transforms and coordinate spaces. This guide shows you how to build a pair of animating eyeballs, providing a comprehensive tour of SVG features detailed in other tutorials.
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