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SVG Circuit_macros examples, Version XXX

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This file shows diagrams in .svg format produced without the use of LaTeX or equivalent. The diagrams have been adapted from the Circuit_macros examples in order to test the svg output of dpic. Generating svg line art is straightforward but formatting text is not because TeX, LaTeX, and related word processors do not produce svg directly. Either less-sophisticated text formatting must be employed for svg or an intermediate format such as pdf can be produced, followed by an additional processing step to convert to svg. Two possibilities for the latter are dvisvgm and pdf2svg. However, many circuit and similar diagrams intended for the web do not require sophisticated labels; the examples shown below might be representative.

Click on the link to view the source of each diagram.

There are other issues:

  • The default font face is not specified in all of these diagrams but is inherited from the enclosing document, so the appearance of labels can differ depending on the browser. Some of these diagrams set the font at the beginning of the diagram source.
  • The <svg tag may require modification from the default used for this test.
  • Diagrams such as these contain text labels that have to be treated differently from the LaTeX-compatible versions. Apparently there is no direct way to know the bounding box of arbitrary svg text. Consequently, text placement is approximate and may require manual adjustment. Rather than patch the original source files for svg production, edited copies have been used. The configuration file svg.m4 read by m4 prior to libcct.m4 contains the following macros defined for svg. Others could be defined to exercise some of the media capabilties of svg. They are subject to change:
    • m4tt`'svg_font(font-face,nominal size[:dptextratio],textoffset, dpic commands`'m4tt): Change font face, size, textratio and dpic textoffset parameters. Change font face and dpic m4tt`'textht, m4tt`'dptextratio, and m4tt`'textoffset parameters. If arg4 is blank, the font is changed and requires m4tt`'command "</g>" to cancel the font change.
      Note: Nominal height = text height in drawing units; actual height = nominal ht x m4tt`'dptextratio.
      Examples:
      m4tt`'svg_font(Times)
      m4tt`'svg_font(Times,14bp__)
      m4tt`'svg_font(sans-serif,14bp__:0.71)
      m4tt`'svg_font(Times,11bp__,1bp__,"text" at A)
      m4tt`'svg_font(font-family="Times")
      m4tt`'svg_font(font-family="Times" font-style="italic")
      m4tt`'svg_font(style="font-family:Times; font-style:italic")
    • m4tt svgfontratio(font name`'m4tt); Reasonable m4tt`'dptextratio value for common fonts, used by m4tt`'svg_font.
    • m4tt svg_tspan(text attributes, text`'m4tt); e.g. m4tt`'svg_tspan(font-style="italic" font-size="75%",XYZ)
    • m4tt svg_it(text`'m4tt): for italics
    • m4tt svg_tt(text`'m4tt): for monospace (courier)
    • m4tt svg_sf(text`'m4tt): sans-serif (Helvetica)
    • m4tt svg_norm(text`'m4tt): for normal text
    • m4tt svg_bf(text`'m4tt): for bold face
    • m4tt svg_small(text, percent`'m4tt): to set a smaller text size, default 66
    • m4tt svg_fsize(text, percent`'m4tt): for setting larger or smaller text size, default 100
    • m4tt svg_sub(text, size percent, y displ, x displ`'m4tt): subscript
    • m4tt svg_ul(text`'m4tt): underlined text
    • m4tt svg_ol(text`'m4tt): overlined text
    • m4tt svg_sup(text, size percent, y displ, x displ`'m4tt): superscript
    • m4tt svg_hat(character`'m4tt): circumflex-accented character
    • m4tt svg_frac(numerator[:wid], denominator[:wid]`'m4tt): basic fraction, wid in drawing units
    • m4tt svg_rot(degrees, "text" [at position]`'m4tt): Rotate text degrees (default 90) ccw. Requires m4tt`'svg_rot_init(filename`'m4tt) and the source must be processed twice.
    • m4tt svg_rot_init(filename`'m4tt): filename is the basename of the output of m4tt`'dpic -v filename.pic > filename.svg`'m4tt
    • m4tt svg_symbol(text`'m4tt): allow quoted pound sign in text, e.g., m4tt`'svg_symbol(10&`#'176;) produces 10°
    • m4tt svgLink(URL, drawing object, m4tt[B]): link to external file using <a xlink:href=...>...</a> (default is m4tt`'target="_blank" unless arg 3 = B)
    • m4tt svgLinkString as above but for strings attached to objects
    • Greek and other symbols:
      m4tt svg_alpha changecom(,)&`#'945;changecom(`#') m4tt svg_beta changecom(,)&`#'946;changecom(`#') m4tt svg_Gamma changecom(,)&`#'915;changecom(`#') m4tt svg_gamma changecom(,)&`#'947;changecom(`#') m4tt svg_Delta changecom(,)&`#'916;changecom(`#') m4tt svg_delta changecom(,)&`#'948;changecom(`#') m4tt svg_epsilon changecom(,)&`#'949;changecom(`#') m4tt svg_zeta changecom(,)&`#'950;changecom(`#')
      m4tt svg_eta changecom(,)&`#'951;changecom(`#') m4tt svg_Theta changecom(,)&`#'920;changecom(`#') m4tt svg_theta changecom(,)&`#'952;changecom(`#') m4tt svg_iota changecom(,)&`#'953;changecom(`#') m4tt svg_kappa changecom(,)&`#'954;changecom(`#') m4tt svg_Lambda changecom(,)&`#'923;changecom(`#') m4tt svg_lambda changecom(,)&`#'955;changecom(`#') m4tt svg_mu changecom(,)&`#'956;changecom(`#')
      m4tt svg_nu changecom(,)&`#'957;changecom(`#') m4tt svg_Xi changecom(,)&`#'926;changecom(`#') m4tt svg_xi changecom(,)&`#'958;changecom(`#') m4tt svg_Pi changecom(,)&`#'928;changecom(`#') m4tt svg_pi changecom(,)&`#'960;changecom(`#') m4tt svg_rho changecom(,)&`#'961;changecom(`#') m4tt svg_Sigma changecom(,)&`#'931;changecom(`#') m4tt svg_sigma changecom(,)&`#'963;changecom(`#')
      m4tt svg_tau changecom(,)&`#'964;changecom(`#') m4tt svg_upsilon changecom(,)&`#'965;changecom(`#') m4tt svg_Phi changecom(,)&`#'934;changecom(`#') m4tt svg_phi changecom(,)&`#'966;changecom(`#') m4tt svg_chi changecom(,)&`#'967;changecom(`#') m4tt svg_Psi changecom(,)&`#'936;changecom(`#') m4tt svg_psi changecom(,)&`#'968;changecom(`#') m4tt svg_Omega changecom(,)&`#'937;changecom(`#')
      m4tt svg_omega changecom(,)&`#'969;changecom(`#') m4tt svg_micro changecom(,)&`#'956;changecom(`#') m4tt svg_ohm changecom(,)&`#'937;changecom(`#') m4tt svg_lt changecom(,)&`#'60;changecom(`#') m4tt svg_gt changecom(,)&`#'62;changecom(`#') m4tt svg_leq changecom(,)&`#'8804;changecom(`#') m4tt svg_geq changecom(,)&`#'8805;changecom(`#') m4tt svg_prime changecom(,)&`#'8242;changecom(`#')
      m4tt svg_backsl changecom(,)&`#'92;changecom(`#') m4tt svg_pound changecom(,)&`#'35;changecom(`#') m4tt svg_comma changecom(,)&`#'44;changecom(`#') m4tt svg_lparen changecom(,)&`#'40;changecom(`#') m4tt svg_rparen changecom(,)&`#'41;changecom(`#') m4tt svg_circ changecom(,)&`#'710;changecom(`#') m4tt svg_deg changecom(,)&`#'176;changecom(`#') m4tt svg_grave changecom(,)&`#'96;changecom(`#')
      m4tt svg_emsp |changecom(,)&`#'8195;changecom(`#')| m4tt svg_ensp |changecom(,)&`#'8194;changecom(`#')| m4tt svg_thinsp |changecom(,)&`#'8201;changecom(`#')| m4tt svg_equiv changecom(,)&`#'8801;changecom(`#') m4tt svg_tilde changecom(,)&`#'126;changecom(`#') m4tt svg_uscore changecom(,)&`#'95;changecom(`#')
  • Inkscape: It may be efficient to define elements by macro and to place them using a wysiwyg graphics editor. A draft page intended for Inkscape is included. A reasonable variety of elements is defined but many more could be added and they should be customized for particular applications. Adjustments may also have to be made to obtain the proper snap-to actions.
  • Link experiments: Click on the resistor or source of quickDPV to go to external files in new windows. Click on "n-port" in NportDPV to replace the diagram and then "back" to return.
  • Some of the assumptions used to create this draft may be na&`#'239;ve. Comments are welcome.
cfig(XXXXX)