Graphical Input TechniquesWe have seen several input devices, which bear resemblance to pens and pencils example light pens, joysticks etc. To some extent they are intentionally made toresemble thedevice that the user isfamiliar with.For example, writing on a pad with a pen like stylus is more convenient for the user. However, there is a basic difference between the targets of such inputsi.e. a material written with a pen are targeted towards the human user, while the graphical input derives are targeted towards the computer. Herein lies the difference. The human can understand variations of input to a large extent. For example the letter A may be written in different ways by different people or for that matter, the same person may write it in different ways at different times. While a human can understand the variations, a computer normally cannot. In other words, the input to human can vary over a range, while the inputs to a computer needs to be precise.Similarly while drawing a circle;if the twoends do not meet properly, a human being can still consider it as a circle, whereas a computer may not. At the same time, training a person to say, precisely write ...
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