SVG Circuit_macros examples, Version XXX

This file shows diagrams in .svg format produced without the use of LaTeX or equivalent. The diagrams have been selected and 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.
• Diagrams such as these contain text labels that have to be treated differently from the LaTeX-compatible versions; for example, 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>" at the end 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 (typically of the form &#nnn; so care is required when used in a macro argument):

    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(`#')|

• 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.