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By M. M. Novak (auth.)

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Extra resources for Advanced Graphics with the Commodore 128

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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. The remaining string at the end of a column is printed in line 190. Ultra-high-resolution dump As we now know, the resolution attained with the C-128 is 320 dots in the horizontal direction and 200 dots in the vertical direction.

If this is not done, the final image may not be what you intended. For instance, translating an object first and then rotating it produces an image that is different from the one produced if the object is first rotated and then translated. 5. 5 Transformations and matrices As we have seen, transformations can be described by simple mathematical operations. However, this simplicity soon disappears if several transformations are concatenated and, the resultant relations become rather cumbersome. In order to preserve simplicity, we use matrices to perform transformations.

The transfer of this pattern from ROM into the display file is accomplished in the loops in lines 160-200. The idea behind the large characters is to display each byte defining a character twice, thus effectively doubling its size. 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.

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