Pale Vertical Band Position Calculator
Center a vertical pale band inside a caller rectangular field envelope.
Description
A pale is a vertical band whose width and centering can be expressed geometrically.
A pale is a vertical band whose width and centering can be expressed geometrically.1
A rectangular-envelope calculation supplies edges without determining a heraldic convention's preferred proportion.
When to use Pale Vertical Band Position Calculator
Use this tool to calculate or review the supplied observations under the stated rules. Establish the source tradition, viewing frame, coordinate units and independently annotated features.
How to use Pale Vertical Band Position Calculator and understand its results
- Establish the source tradition, viewing frame, coordinate units and independently annotated features.
- Enter fieldWidth, paleWidth, using the field meanings and rules below, then run the tool.
- Read result.leftEdgeX, result.rightEdgeX, using the output meanings and calculation rules below.
- Correct any reported input issue and run again. Before using a successful result, check the stated units, signs, reference scope and observation coverage.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| fieldWidth | Field width | number | Required |
| paleWidth | Pale width | number | Required |
Require a positive field width and positive pale width no greater than it. Center the band by returning (fieldWidth−paleWidth)/2 and (fieldWidth+paleWidth)/2.
left=(w−p)/2; right=(w+p)/2 Use the matching field units and the exact boundary, ordering and reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| result | Calculated observation or reference | object |
| result.leftEdgeX | left Edge X | number |
| result.rightEdgeX | right Edge X | number |
{
"input": {
"fieldWidth": 100,
"paleWidth": 20
},
"output": {
"result": {
"leftEdgeX": 40,
"rightEdgeX": 60
}
}
}Limitations and assumptions
No default ordinary width or shield-contour clipping is supplied. Use a common unit for both measurements.
Missing required fields, unknown fields, wrong types and violated rules return input issues. Numeric values and outputs must be finite. Extremely large composite outputs are rejected.
Alternative or Complementary methods
For a related step, use Ordinary Width Proportion Checker (chief/fess/pale/bend): Ordinary-width review depends on the selected drawing and proportion standard. For a complementary comparison, use Fess Center Line Offset Calculator: A fess center can be compared with the field's geometric mid-height.
References
-
Pale Vertical Band Position Calculator — tool.io
Similar or alternative tools
- Ordinary Width Proportion Checker (chief/fess/pale/bend)
Ordinary-width review depends on the selected drawing and proportion standard.
- Fess Center Line Offset Calculator
A fess center can be compared with the field's geometric mid-height.