barcodewriter zxing c# Note A full list of SVG implementations is available from the W3C pages at in Font

Generator PDF-417 2d barcode in Font Note A full list of SVG implementations is available from the W3C pages at

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http://www.w3.org/Graphics/SVG/SVG-Implementations.htm8.
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For example, try viewing the simple SVG graphic in Listing 16-1 (circle.svg) after installing SVG Viewer. Listing 16-1. circle.svg <svg width="12cm" height="4cm" viewBox="0 0 1200 400" xmlns="http://www.w3.org/2000/svg"> <circle r="100" cx="600" cy="200" fill="#C00" stroke="black" stroke-width="10" </svg>
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You should see a red circle with a black border in the browser window, as shown in Figure 16-1.
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Figure 16-1. Viewing circle.svg in Internet Explorer
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This looks just the same as a bitmap image. For example, Figure 16-2 shows circle.bmp in Microsoft Paint at a normal zoom.
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CHAPTER 16 CREATING SVG
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Figure 16-2. Viewing circle.bmp in Paint at normal zoom The bitmap circle looks smooth at this resolution, but when you zoom in to the circle s edge, you start to see the pixels that make up the picture, as shown in Figure 16-3.
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CHAPTER 16 CREATING SVG
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If, using Adobe s SVG Viewer, you bring up the context menu for the SVG graphic in Internet Explorer (right-click the picture), then you ll see various useful options, including the ability to zoom in to the image. You can use this context menu to zoom in to the edge of the circle, as shown in Figure 16-4.
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Figure 16-4. Viewing circle.svg in Internet Explorer at 8x zoom Notice that no matter how closely you zoom in to the image, the edge never becomes pixilated. This demonstrates the advantage of vector graphics over bitmaps. Like any other markup language, SVG uses namespaces to distinguish between elements that are part of SVG and elements that are part of other markup languages (which might be included in the SVG graphic, such as XHTML or XLink). The namespace for SVG elements is http://www.w3.org/2000/svg
You may notice that some SVG graphics don t include a namespace declaration for this namespace. Tip
That s because the DTD for SVG includes an attribute declaration for an attribute named xmlns that effectively declares the default namespace. I recommend that you always include the namespace declaration explicitly, so that the SVG graphic is readable even if the DTD isn t available for some reason.
The document element of an SVG document is an <svg> element. Inside the <svg> element are the elements used to construct the image. But before we start looking at how graphics are k within SVG.
CHAPTER 16 CREATING SVG
Lengths and Coordinates
Aside from the namespace declaration, the <svg> element can define the size of the SVG graphic using the height and width attributes. These attributes describe the default size of the canvas, which is the area in which the graphic is displayed. These values may be overridden when the SVG graphic is embedded within an HTML page (or even within another SVG graphic). You can also specify a viewBox attribute on the <svg> element, which holds four numbers separated by spaces: minimum x-coordinate, minimum y-coordinate, width, and height. The viewBox attribute defines a coordinate system used when defining lengths within the graphic and defines the size of a user unit. For example, in circle.svg the viewBox attribute defined a coordinate system starting at (0, 0), spanning 1200 user units in width and 400 user units in height. This sets up a grid as shown in Figure 16-5.
0 100 200 300 400 500 600 700 800 900 1000 1100 1200
0 100 200 300 400
Figure 16-5. A 1200 400 view box
The graphic as a whole has a width of 12 cm and a height of 4 cm, corresponding to the width of 1200 user units and the height of 400 user units. Thus 100 user units on the grid correspond to 1 cm in the page. If the width had instead been set to 24 cm and the height to 8 cm, then 100 user units on the grid would correspond to 2 cm in the page; if the width had been set to 600 mm and the height to 200 mm, then 100 user units would correspond to 50 mm. In the rest of the image, most lengths and coordinates are described relative to this grid. For example, take another look at the definition of the circle: <circle r="100" cx="600" cy="200" fill="#C00" stroke="black" stroke-width="10" /> The radius of the circle (specified with the r attribute) is defined as 100 user units and the center of the circle (specified with the cx and cy attributes) is at the coordinate (600, 200), which is the center of the grid. When displayed in the page, the circle should have a 1 cm radius and be placed 6 cm across and 2 cm down the page, because 100 user units is equivalent to 1 cm. If the width of the image is 12 cm and the height 8 cm (such that the ratio of units to length on the width is different from the ratio of units to length on the height), then the preserveAspectRatio attribute comes into play. Usually, one user unit will be the same distance horizontally and vertically, with the grid aligned in the center of the image, as in Figure 16-6, which shows circle2.svg.
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