A computer-based mapping system. Maps, including Ordnance Survey, linked to associated databases, e.g. census surveys. Graph Plotter Software which will draw on screen the graph of a mathematical function. Graphical Calculator A calculator that can be programmed to draw graphs of mathematical functions. Graphics Tablet A device connected to a computer that enables the user to create pictures on screen by hand using a stylus.
Computers store images in a variety of ways.
These generally fall into one of two categories. They are bitmap or vector graphics. A picture can be stored as a simple copy of the original. This is a collection of very small rectangles, rather like making a picture by colouring individual squares on graph paper, called a bitmap image. If it is enlarged, the small rectangles are simply made bigger and the image loses its sharpness.