Description
Add signed allowance to seamlineCoordinate for cutlineCoordinate.
Garment and pattern calculations use measurements, allowances, fold conventions, and repeat positions. A local calculation is one pattern component; fabric behavior, fit, and manufacturing tolerances require separate assessment.
Add signed allowance to seamlineCoordinate for cutlineCoordinate.
When to use this tool
Use Seam Allowance Cutline Offset when you need a bounded pattern, spacing, or allowance component using consistent length units.
How to use the tool and how it works
- Enter seamlineCoordinate, allowance, outwardSign. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read cutlineCoordinate. Use the output convention below.
Require nonnegative allowance and outwardSign equal to -1 or +1. Add signed allowance to seamlineCoordinate for cutlineCoordinate.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| seamlineCoordinate | Seamline Coordinate | Required. Finite number. |
| allowance | Allowance | Required. Finite number; minimum 0. |
| outwardSign | Outward Sign | Required. Safe integer. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| cutlineCoordinate | Cutline Coordinate | Required. Finite number. |
{
"input": {
"seamlineCoordinate": 20,
"allowance": 1.5,
"outwardSign": 1
},
"output": {
"cutlineCoordinate": 21.5
}
}Limitations and assumptions
- This is one-axis offset arithmetic, not a full curved seam offset, corner treatment, pattern fit, or cutting plan.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Check the complete pattern and test fit or material behavior before production.
References
Similar or alternative tools
- Hem Fold Fabric Takeup
Multiply depth by count for totalTakeup and add to finishedLength for cutLength.
- Garment Size Spec Single Tolerance
Return measured minus nominal as deviation and test measured within nominal minus lowerTolerance through nominal plus upperTolerance, including both boundaries.