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JpGraph 1.26 (Stable branch)
06-19-2008
JpGraph is an OO Graph drawing library for PHP 4.3.x and above. Highlights of the available features are: text, integer/linear, and log scales for both the X and Y axes; anti-aliasing of lines; color-gradient fills; support for GIF, JPG, and PNG formats; support for two Y axes, spider plots (a.k.a Web plots), pie-charts, lineplots, filled line plots, impulse plots, bar plots, error plots, and polar plots; Gantt charts; support for multiple plot types in one graph; intelligent autoscaling; and extensive documentation (150 pages). License: Free for non-commercial use Changes:|
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pnmshear(1) General Commands Manual pnmshear(1) NAME
pnmshear - shear a portable anymap by some angle SYNOPSIS
pnmshear [-noantialias] angle [pnmfile] DESCRIPTION
Reads a portable anymap as input. Shears it by the specified angle and produces a portable anymap as output. If the input file is in color, the output will be too, otherwise it will be grayscale. The angle is in degrees (floating point), and measures this: +-------+ +-------+ | | | | OLD | | NEW | | |an +-------+ |gle+-------+ If the angle is negative, it shears the other way: +-------+ |-an+-------+ | | |gl/ / | OLD | |e/ NEW / | | |/ / +-------+ +-------+ The angle should not get too close to 90 or -90, or the resulting anymap will be unreasonably wide. The shearing is implemented by looping over the source pixels and distributing fractions to each of the destination pixels. This has an "anti-aliasing" effect - it avoids jagged edges and similar artifacts. However, it also means that the original colors or gray levels in the image are modified. If you need to keep precisely the same set of colors, you can use the -noantialias flag. This does the shearing by moving pixels without changing their values. If you want anti-aliasing and don't care about the precise colors, but still need a lim- ited *number* of colors, you can run the result through ppmquant. All flags can be abbreviated to their shortest unique prefix. SEE ALSO
pnmrotate(1), pnmflip(1), pnm(5), ppmquant(1) AUTHOR
Copyright (C) 1989, 1991 by Jef Poskanzer. 12 January 1991 pnmshear(1)