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Scan Converting a sStraight Line

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Scan Converting a Straight Line A straight line may be defined by two endpoints & an equation. In fig the two endpoints are described by (x 1 ,y 1 ) and (x 2 ,y 2 ). The equation of the line is used to determine the x, y coordinates of all the points that lie between these two endpoints. Using the equation of a straight line, y = mx + b where m = & b = the y interrupt, we can find values of y by incrementing x from x =x 1 , to x = x 2 . By scan-converting these calculated x, y values, we represent the line as a sequence of pixels. Properties of Good Line Drawing Algorithm: 1. Line should appear Straight: We must appropriate the line by choosing addressable points close to it. If we choose well, the line will appear straight, if not, we shall produce crossed lines. The lines must be generated parallel or at 45° to the x and y-axes. Other lines cause a problem: a line segment through it starts and finishes at addressable points, may happen to pass through no an...
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Computer Mouse

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Computer mouse From Wikipedia, the free encyclopedia Jump to navigation Jump to search This article is about the item of computer hardware. For the pointer it controls, see Pointer (user interface) . For other uses, see Mouse (disambiguation) . A computer mouse with the most common features: two buttons (left and right) and a scroll wheel, which can also act as a third button. A computer mouse , often simply referred to as a mouse , is a hand-held pointing device that detects two-dimensional motion relative to a surface. This motion is typically translated into the motion of a pointer on a display , which allows a smooth control of the graphical user interface . The first public demonstration of a mouse controlling a computer system was in 1968. Originally wired to a computer, many modern mice are cordless, relying on short-range radio communication with the connected system. Mice originally used a ball rolling on a surface to detect motion,...
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