ltspice2svg 2021.2

Converting LTspice file to SVG

ltspice2svg 2021.01.01

Many times engineers need high resolution images of LTspice schematics. Specially in case of large schematics, the inbuilt option of 'Copy to Clipboard' picks up raster images which are uneasy to use. Also in case of using schematics in Documents, the raster images are not good to render.

This tool can be used to convert LTspice schematic .asc files to SVG files, which can then be fine tuned for beautiful schematics.

Words of Developer

This is the first version of this library, however being frank to users, this version is not able to detect the GND, COM, directional flag envelopes and flag directions. I would appreciate any developer from any community who wants to contribute to this project.

Being a graduation student, I am unable to work over it for long. I will try to release next version having the above features as soon as possible.

Features

The following attributes of SVG drawing can be manipulated from defaults. With syntax written along with.

Color of different parts of Schematic

Function called 'colour' can be used to manipulate the colors.

Color variable	Default Value	Description
symbColor	#000000	Color of stroke of basic shapes viz. Rectangle, Circle, Line and Arc used for making Symbols or Components
symbTextColor	#42f5aa	Color of text used for making Symbols or Components
symbAttrColor	#f59e42	Color of attributes of Symbols or Components
symbPinColor	#8742f5	Color of pin symbols of Symbols or Components, here circle is used to represent it
symbFillColor	#fff9eb	Color of rectangle fill color used to make Symbols or Components
flagColor	#77fc03	Color of Text flags
gndColor	#fc0352	Color of GROUND/GND symbol
comColor	#03bafc	Color of COMMON/COM symbol
wireColor	#524e63	Color of wires
intsecColor	#0000ff	Color of junctions symbols, here square is used to represent it
textColor	#eb3464	Color of Text/Comment
busTapColor	#ec03fc	Color of bus taps

Syntax:

colour( isBW=False, symbColor="#000000", symbTextColor="#42f5aa", symbAttrColor="#f59e42", symbPinColor="#8742f5", symbFillColor="#fff9eb", flagColor="#77fc03", gndColor="#fc0352", comColor="#03bafc", wireColor="#524e63", intsecColor="#0000ff", textColor="#eb3464", busTapColor="#ec03fc")

Example:

from ltspice2svg import *
colour (gndColor ="#20fc03", comColor ="#00bbff")

There is a special variable in colour settings described as follows which holds a special importance:

Variable	Default Value	Description
isBW	False	If isBW is set to True then all colors are set to Black, hence generating Black and White SVGs.

For all color variables any valid hex-coded color value is acceptable, wheras for isBW only Boolean values are accepted.

Font properties

Function called 'setFont' can be used to manipulate the font properties.

Variable	Default Value	Description
fontSize	12	Font size of Text/Comments in pt
fontWeight	"bold"	Font weight of Text/Comments/Flags
fontFamily	"Tahoma"	Font family of Text/Comments/Flags
flagFontSize	10	Font size of Flag texts in pt
pinFontSize	6	Font size for pin text in pt
pinFontWeight	"normal"	Font weight for pin text
pinFontFamily	"Arial"	Font family for pin text

Syntax:

setFont (fontSize=12, fontWeight="bold", fontFamily="Tahoma", flagFontSize=10, pinFontSize=6, pinFontWeight="normal", pinFontFamily="Arial")

Example:

from ltspice2svg import *
setFont (fontSize =12, pinFontWeight ='Normal', fontFamily ="SimSun")

For all font sizes any integer value from 1 to 144 are acceptable. Font weight can be either 'Normal' or 'Bold'. Also font family can be any font from those mentioned below:

Arial	Bahnschrift	Calibri	Cambria	Candara
Comic Sans MS	Consolas	Constantia	Corbel	Courier New
Ebrima	Franklin Gothic Medium	Gabriola	Gadugi	Impact
Ink Free	Javanese Text	Leelawadee UI	Lucida Console	Malgun Gothic
Microsoft Himalaya	Mongolian Baiti	MS Gothic	MV Boli	Myanmar Text
Nirmala UI	Segoe Print	SimSun	Sitka Text	Sylfaen
Tahoma	Times New Roman	Trebuchet MS

Pen properties

Function called 'setPen' can be used to manipulate the pen.

Variable	Default Value	Description
lineWidth	0.3	Width of stroke of basic shapes
ISside	4	Junction square side in pt
PPradius	2	Pin circle radius in pt

Syntax:

setPen (lineWidth=0.3, ISside=4, PPradius=2)

Example:

from ltspice2svg import *
setPen (width =0.6)

All three parameters can be Float or Integer value with stroke width, junction square side, pin circle radius from 0 to 5, 1 to 20 and 1 to 20 respectively.

Drawing SVG

SVG can be drawn using 'draw' function with attributes set (as described above). If none attribute is set, then default values are used. Syntax:

draw (spiceFileAddress, saveAddress)

Example:

from ltspice2svg import *
draw (r'starter.asc', r'schematic.svg')