sd & d vector graphics

Vector GraphicsVector graphics store an image using geometrical objects like points, curves and polygons. Each object is saved as a set of attributes - a description of how it is to be drawn.


image_no, shape_type, startx, starty, length, height, line, fill

or

1, rectangle, 20, 30, 400, 80, 3, 26


image_no, shape, centrex, centrey, radius, line, fill

or

2, oval, 250, 520, 80, 6, 92

Vector GraphicsThe computer changes the information in the set of attributes if...

...an object is moved to a new position on the screen.


...an object is resized.


...the fill pattern of the object is changed.


...the line thickness of the object is changed.

Vector Graphics

• change the colour of part of the object

• delete part of the object

It is not possible to:

Advantages of Vector Graphics

• Small file size

• Actual objects are created which can be moved and re-sized

• The file is resolution independent. If it is sent to a printer which has a higher resolution then it is printed at that higher resolution

600 dpi

300 dpi

Disadvantages of Vector Graphics

• The file size increases rapidly as more shapes are added to the graphic

• Cannot edit part of an object

CreditsHigher Computing – Data Representation – Vector Graphics

Produced by P. Greene and adapted by R. G. Simpson for the City of Edinburgh Council 2004

Adapted by M. Cunningham 2010

All images licenced under Creative Commons 3.0• flikr1609 by flikr / Kelbv (flickr)• flikr2001 by flikr / Kelbv (flickr)

sd & d vector graphics

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