slideruleimages 0.0.3

A Python package, with no dependencies, producing SVG images of Slide Rule scales

slideruleimages

Python package to produce Slide Rule SVG images

A typical example might be:

from slideruleimages import Rule

# xvalue is where the C scale index is placed over the D value
# right is True if the mid scale is moved to the right
# right is False if the mid scale is moved to the left
# hairline is where the hairline cursor is placed over the D value,
# or zero if no hairline is used 

rl = Rule(xvalue = 2.0, right = True, hairline=6.0,
          topruleheight = 0,                        # No top rule
          midruleheight = 120,                      # middle slider 120px high
          btmruleheight = 120)                      # bottom rule 120 px high

# Add a C scale
rl.addCscale(midrule=20)  # indicates this scale is put on the middle rule
                          # 20 pixels down from the top of the middle rule

# Add a D scale
rl.addDscale(btmrule=0)   # indicates this scale is put on the bottom rule
                          # 0 pixels down from the top of the bottom rule

filename = "twoxthree.svg"

rl.write(filename)

print(f'{filename} created')

This would produce:

This package is intended to produce images useful for documents or web sites which illustrate logarithms or Slide Rules. One such web site is available at:

https://bernie-skipole.github.io/sliderule/

The package has one class, Rule, which is illustrated above and has the methods:

write(filename) This saves the image file.

addAscale(btmrule=-1, midrule=-1, toprule=-1)

addBscale(btmrule=-1, midrule=-1, toprule=-1)

addCscale(btmrule=-1, midrule=-1, toprule=-1)

addCFscale(btmrule=-1, midrule=-1, toprule=-1)

addDscale(btmrule=-1, midrule=-1, toprule=-1)

addDFscale(btmrule=-1, midrule=-1, toprule=-1)

addLL0scale(btmrule=-1, midrule=-1, toprule=-1)

addLL1scale(btmrule=-1, midrule=-1, toprule=-1)

addLL2scale(btmrule=-1, midrule=-1, toprule=-1)

addLL3scale(btmrule=-1, midrule=-1, toprule=-1)

Only one of the arguments btmrule, midrule or toprule should be given a non -1 argument which indicates which rule the scale should appear on, and the integer number of pixels down from the top of that rule.

Note each scale is 100px high, so in the example a midruleheight of 120 with a midrule of 20, sets the C scale onto the midrule, with a 20px space at the top of the rule, and the actual scale sitting against the bottom of the rule.

The package is available on Pypi at:

https://pypi.org/project/slideruleimages/