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Presenting Work: Graphics and Charts. Letts Chapter 14. Computer Graphics. Computer graphics refers to any pictures or graphs produced using a computer. Drawing and Design Packages. Drawing and design packages include packages for: freehand drawing and ‘painting’;

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Presenting Work: Graphics and Charts


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    1. Presenting Work: Graphics and Charts Letts Chapter 14

    2. Computer Graphics Computer graphics refers to any pictures or graphs produced using a computer.

    3. Drawing and Design Packages Drawing and design packages include packages for: • freehand drawing and ‘painting’; • image manipulation; • 3-D modelling; • animation.

    4. Picture Storage Storage of pictures can be: • pixel based (bit-mapped) - a picture stored as a set of dots; • object based (vector or line) - each picture is stored as a set of shapes.

    5. Paint Packages A paint package is a general term for any program which allows freehand drawing and colouring.

    6. Computer Aided Design A computer aided design (CAD) system allows the user to produce accurate drawings. Hardware for CAD usually includes: • a microcomputer with a large hard disk and main store; • a graphics tablet with a stylus; • a high resolution monitor; • a plotter or at least a laser printer;

    7. CAD and CAM • CAM is computer aided manufacture. • CAD/CAM is a CAD system integrated with a CAM system.

    8. Graphs and Charts Graphs and charts are often referred to as “business graphics”. Types of graph include: • a bar chart, made up of rectangular; blocks or bars; • a pie chart, in the form of a circle with lines drawn out from the centre; • a line graph, which has a set of points joined by a line; • a scatter graph, produced when two different quantities are plotted against one another.

    9. These types of graphs are used as follows: • bar chart - to show the relative sizes of separate values; • pie chart - to show how something is shared; • line graph - to show how a quantity is changing; • scatter graph - to show how different quantities are related;