Advanced Graphics with the Commodore 128 by M. M. Novak (auth.)

By M. M. Novak (auth.)

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Similar considerations apply to T3$. The CHAR command is very useful and it will suffice on most occasions. However, sometimes the size of the available characters will be too small. We shall now find a way of partially removing this limitation. The characters that we now create are enlarged in the vertical direction only; the horizontal expansion is somewhat more involved and is not discussed here. The new characters appear on the screen occupying the 8 x 16 grid. To continue, we must first learn something about the character ROM.

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. Once again, only one dimension is expanded.

Scaling The effect of this transformation is either to change the size or to alter the overall proportions of the original image. 2. 2 0 X Two-dimensional Transformations 51 Y1 =Y•Sy X1 =X•Sx where Sx and Sy are the scaling factors in the x- and y-directions, respectively. If Sx and Sy have the same value, then the overall shape of the transformed image is preserved, though its size is affected. If the value of the scaling factors is larger than unity then the image is expanded; if ius smaller then the image shrinks.

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