Greenwood press
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book-20600
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- CARTESIAN COORDINATES
ASYMPTOTE
9 A graph describing the hourly rate to drill a hole as a function of its depth. The drilling cost becomes insurmountable as the depth approaches 1,000 feet, because it is too difficult and dangerous to dig at that depth. Scaling the Internet Web servers The terminal velocity of coffee filters Time travel? The twisted pendulum experiment ▲ ▼ ▲ CARTESIAN COORDINATES Coordinates are useful to determine relative position and distances. For example, pixels (dots of light) on a computer are identified by their horizontal and vertical components, where (0,0) is at the corner of the screen. The coordi- nates of the pixels are useful for animations that require starting and ending points for each vertex in a diagram. Given this information, the computer will predict intermittent coordinates of the vertices to help render the animation, with- out having to input the coordinates for every second on the screen. Coordinates are also useful in computer programming to plot points on the screen or define regions on a blueprint or graphic. For example, an image map is a graphic that links certain portions of a Web page to different pages on a Web- site. Image maps are used to enhance the colors on a screen or to provide a larger region to click a list of items. The image map will probably look like a series of buttons that are defined by geometric regions, such as rectangles or circles. When the cursor is moved to a coordinate within a defined region on the image map, it will move to a new page once the mouse is clicked. Suppose a rectangular region is defined so that its upper-left coordinate is (12,35) and lower-right coordinate is (40,70), as shown in the illustration below. This will create a hot spot region Download 1.81 Mb. Do'stlaringiz bilan baham: |
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