By M. M. Novak (auth.)
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Extra resources for Advanced Graphics with the Commodore 128
The location in the display file corresponding to a given point is found in lines 200-210. The line segments joining the points as supplied by a function are coded in lines 230--350. The printer dump routine begins in line 370. Symbols E$, G$, and M$ are the printer control codes. The type of resolution is selected through the M$ parameter. This string is specified by M$ = CHR$(Z), where Z can have any value as follows: Zvalue Resolution 0 1 2 3 4 5 60 dots/inch 120 dots/inch 120 dots/inch 240 dots/inch 80 dots/inch 72 dots/inch 90 dots/inch 6 When Z = 2 is selected, the computer requires as much time and memory as for Z = 1 (double-density mode), but the printing time is reduced by half, as the output appears in normal density.
This is done by two consecutive POKEs. The number 320 in line 180 refers to number of bytes in a row. This loop is similar to the one in line 160 and builds the other half of expanded characters in another row. Expanded printer output It seems appropriate now to include a routine that produces an enlarged printout of the display file. Once again, only one dimension is expanded. 11. 4. The essential difference is in lines 170 where the CHR$(W) is added twice to the resulting ZR$. As the number of 44 Advanced Graphics with the Commodore 128 characters in this string exceeds the allowable maximum, the string is sent to the printer whenever it exceeds 230 characters, as seen in line 180.
M. 1 The principle involved in displaying input data in the form of a histogram is quite simple. The independent variable (frequently time) varies along, say, the x-axis. The value of the dependent variable is represented by the height of a bar. There are many ways to build a bar. In this book we shall concentrate solely on constructing histograms within the high-resolution graphics mode. Although the execution time needed is somewhat longer, we gain fine control over the final display, as is amply illustrated in the next pages.