Download A PostScript Cookbook by Barry Thomas (auth.) PDF

By Barry Thomas (auth.)

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Another variable is used for this string - in this case, defmed within the main procedure. This is to ensure that it is cleared before being used for each section. The section itself is then drawn and the graphics state saved, the section filled and the outline restored. Lastly, the vertical position is updated to the bottom of the next section, ready for the next value pair. Times-Roman at 24 points is selected as the font for the chart title. The title is centred at the bottom of the page. The font is then selected for the section labels.

To use solid characters, remove the oshow procedure and replace the single occurrence of oshow in the main program with the show operator. Times is selected and scaled to the given point size. The origin is moved to the center of the A4 page, this is also the center of the base circle around which the text falls. The full width of the given string is then calculated. This is used to center the text around the vertical, rather than starting at the top of the circle and rolling around to some unspecified end.

Each bit in the supplied data provides one pixel of the image - a 1 makes a black pixel and a 0 does nothing. Note that zeros do not render a white pixel, blotting out any previous material underneath; they simply do not have any effect other than to provide blank space between the 1's in the data. In the program a gray square is first drawn and filled, providing a visible background over which the binary image is rendered. For further details of the imagemask operator, see chapter 5.

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