Constructor:Seam algebra
- Measuring lengths in "Seam algebra"
- Results of calculations of the «Seam algebra»
- «Calculator»
- Measurement and Calculation Methods
- Examples of Calculations Made by “Calculator”
The program has a system of measurements and calculations called “Seam algebra”, which allows to make different measurements of a piece, as well as complex calculations for fitting value, piece correction according to the measurement table, etc. The measurement functions of “Seam algebra” are located on the lower panel of the program’s working window:
and 
- selection of the measurement
sign to add or subtract measurement values.
- measure a section as a whole
(between End points).
- measure between two points
or notches of one section along a curve.
- measure between any two
points of a piece along a straight line.
, 
- projection of measured
distance between two arbitrary points on axes Х', 'У'.'
- measure distance along a
curve from a point to crossing with any line
- measure a part of a section
between crossing with lines on both sides.
- “Calculator”.
- display of values of section
lengths and distance between notches on a specified contour.
- clear the measurement
window. The measurement window must be cleared before every new measurement cycle,
so that previous measurement results do not affect the new results.
- clear selected lines in the
measurement window. In case of error measurement, the line with an incorrectly
measured parameter is selected with a mouse click and is deleted with the help
of this command.
- recalculate measurement
results after changing length of a measured section;
restore
the screen highlighting for measured sections (when switched off after screen
redrafting)
- open the table with
measurement results in all sizes.
When
clicking a piece section with a free cursor, the section length is displayed
in the window with measurement results.
When clicking the End point, the values of two adjacent sections are displayed (on the green background)
The result of measurements is displayed for a working size in the window with lengths (on the white background), as sum or difference. When clicking the line with length, the measured section is highlighted on the screen.
When clicking
the piece section, measurement is hidden (green background of the window). To
restore the measurement results, click the window with lengths or select the
command for recalculation. 
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