Basic SVG Elements and Shapes

Aug 26, 2002

📄 Contents

␡

The line Element
The rect Element
The circle Element
The ellipse Element
The polyline Element
The polygon Element
Color in SVG
Gradients in SVG
SVG Patterns
SVG DOM Interfaces for the SVG Basic Shapes
Other SVG DOM Interfaces
Summary

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The polygon Element

The polygon element is designed to create closed shapes, the edges of which consist of multiple (that is, three or more) straight lines. The syntax of the polygon element is essentially identical to that of the polyline element. Listing 3.14, SimplePolygons.svg, was created by simply replacing polyline with polygon in the start tags of Listing 3.13.

Listing 3.14 SimplePolygons.svg—Two Simple Polygon Shapes

<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20010904//EN"
"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
<svg width="500" height="300">
<polygon style="stroke:#000000; stroke-width:2; fill:#CCCCCC;"
 points="30,200 30,50 130,50 30,200" />
<polygon style="stroke:#000000; stroke-width:2; fill:none;"
 points="230,200 230,50 330,50 230,200" />
</svg>

Not surprisingly, the visual appearance produced is identical to that shown in Figure 3.11 in the preceding section, except that zooming in on the bottom vertex of either triangle shows that the polygon element produces a sharp, neat line join.

A polygon element may be animated by any of the SVG animation elements—animate, set, animateColor, animateMotion, or animateTransform—which are described in Chapter 11.

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