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About Vector Graphics
The drawing tools create simple line-based vector graphics that are each a separate object on the slide. For example, if you make a drawing consisting of four rectangles, an oval, and several lines, each of those is separately movable or resizable. You can stack them to create a more complex drawing, format each one individually, and/or group them (by choosing Draw⇨Group) to create a single object that can be formatted, moved, and resized as a single unit.
A vector graphic is one that is based on a mathematical formula, like in geometry class. For example, if you draw a vector graphic line, the application stores the line start point, line end point, and line properties (width, color, and so on) as numeric values. When you move or resize the line, those numbers are updated. Clip art is also a vector graphic type. In contrast, a scanned image or a photo is a bitmap graphic, in which each individual colored dot is represented by a separate numeric value.
| XREF | For more on clip art, turn to Chapter 9, and for more on scanned images photos, turn to Chapter 8. |
The most important advantages of using vector graphics are the following:
Size. Vector graphics don't take up much disk space to store because not every pixel of the image needs to be represented numerically.
Scalability. When you resize a vector graphic, the math is recalculated and the shape is redrawn. That means the picture is never distorted and its lines never get jagged the way bitmap graphics do.
The main drawback to vector graphics is Sack of realism No matter how good an artist you are, a vector graphic will always have a flat, cartoon quality to it.
| Note | 3-D graphics programs such as AutoCAD are based on vector graphics too. They start out with a wireframe image of a 3-D object (such as a cube), combine it with other wireframe images to make an object, and then use a rendering tool to cover the wireframe with a color, pattern, or texture that makes it look like a real object. Many popular video games also use vector graphics, like The Sims, for example. |
