By Jurg Nievergelt, J. Craig Farrar, Edward M. Reingold
ISBN-10: 0131648551
ISBN-13: 9780131648555
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Additional resources for Computer Approaches to Mathematical Problems (Prentice-Hall Series in Automatic Computation)
Sample text
A programmer wishing to output the same sound to both speakers must thus send the sound simultaneously to two of the available four audio channels; no other facility for stereo mixing is provided. Playing a basic sound from a programming standpoint consists of filling a block of memory with eight-bit sample data and requesting that Agnus and Paula play said sample at a given sample rate through a given sound channel. They will then process the request autonomously; in a process akin to that of painting the display, Agnus fetches the sample data from memory and passes them to Paula one byte a time, who in turn passes them through her DACs and on to the external speakers.
At this point, the ball has moved considerably from its initial state near the top center of the screen to a position closer to the bottom right. The viewport at this instant has an X scroll of -37, which has the effect of shifting the view to the left 37 pixels and thus makes the ball appear to have moved to the right; and a Y scroll of -54, which has the effect of shifting the view upward 54 lines and thus makes the ball appear to have shifted toward the bottom of the screen. Note that this Y scroll is given in the opposite of normal mathematical notation, with numbers increasing rather than decreasing in value as they move downward on the Y axis.
Next, the ball itself is drawn into the newly blank playfield. A programmer working on the Amiga after it became an established computing platform would most likely have drawn the ball in one of the many available paint programs, such as EA’s Deluxe Paint series (the subject of chapter 3), and then saved the image data for importation into her program. I in fact took this approach in re-creating the demo in preparation for this chapter. However, applications such as Deluxe Paint did not yet exist in early 1984, so Luck and Mical were forced to do things the hard way, drawing the ball programmatically in the demo itself using trigonometry functions.
Computer Approaches to Mathematical Problems (Prentice-Hall Series in Automatic Computation) by Jurg Nievergelt, J. Craig Farrar, Edward M. Reingold
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