Download A Web for Everyone: Designing Accessible User Experiences by Whitney Quesenbery, Sarah Horton PDF

By Whitney Quesenbery, Sarah Horton

While you're in control of the person adventure, improvement, or procedure for a website, an online for everybody can help you're making your website obtainable with out sacrificing layout or innovation. Rooted in common layout ideas, this publication offers strategies: sensible suggestion and examples of ways to create websites that everybody can use.

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Additional info for A Web for Everyone: Designing Accessible User Experiences (1st Edition)

Example text

Whereas raster graphics cannot be scaled without losing or resampling the image data, vector graphics may be rendered at any scale without a loss of quality. When we talk about vector graphics, we are actually referring to vector graphic file formats. Vector-based display devices (such as oscilloscopes or the old Vectrex video game console) are rare these days. All of the images that we cover in this book become rasterized in the end, whether it is by the display software, video card, or printer.

All rights reserved. Circles are drawn with the arc( ) method, which draws an arc between two angles centered at a specific point on the canvas. The arc( ) method actually takes two diameter parameters (one for the width and one for the height) so that you can draw ellipses. The text in this example is drawn using a 48 pt TrueType font. It is drawn at an angle of 0 degrees (it may be rotated to other angles), with the left margin of the text’s baseline positioned at the point (40, 120). You must specify the full path to TrueType fonts; if you don’t have TrueType fonts available, you can use GD’s builtin bitmapped fonts (see the “Strings and Fonts” section later in this chapter).

The algorithm used is virtually identical to the Quantize( ) method of the Image::Magick module. Brushes, Styles, and Tiles GD defines four alternatives to drawing or filling shapes with simple solid colors. These special “color” variables are: gdBrushed gdStyled gdStyledBrushed gdTiled The following three methods allow you to define the behavior of these special colors. 44 | Chapter 2: On-the-Fly Graphics with GD This is the Title of the Book, eMatter Edition Copyright © 2013 O’Reilly & Associates, Inc.

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