Description
Describe a glyph's ink overhang relative to its supplied advance and origin.
Graphic-design metadata distinguishes font metrics, variable-font axes, fill rules, color labels and design-token units. Numeric axis differences and text labels do not render a font or apply a color profile. The source convention must match before comparing metrics or resolving a design-system reference.
Describe a glyph's ink overhang relative to its supplied advance and origin.
When to use this tool
Use Glyph Overhang Optical Margin Term when checking the stated font, color or design-token convention.
How to use the tool and how it works
- Enter advanceWidth, inkLeft, inkRight. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read leftOverhang, rightOverhang. Use the output convention below.
Require advanceWidth>=0 and inkRight>=inkLeft. Return max(0,-inkLeft) and max(0,inkRight-advanceWidth) as left/right overhang.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| advanceWidth | Advance Width | Required. Finite number; minimum 0. |
| inkLeft | Signed left ink bound relative to glyph origin. | Required. Finite number. |
| inkRight | Right ink bound in the same origin/units, at least inkLeft. | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| leftOverhang | Left Overhang | Required. Finite number. |
| rightOverhang | Right Overhang | Required. Finite number. |
{
"input": {
"advanceWidth": 10,
"inkLeft": -2,
"inkRight": 12
},
"output": {
"leftOverhang": 2,
"rightOverhang": 2
}
}Limitations and assumptions
- Ink coordinates are relative to the glyph origin; overhang is not a kerning recommendation or a rendered text-layout assessment.
- 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
Inspect actual fonts, rendered paths, color profiles and the complete applicable design-system specification for visual or production decisions.
References
Similar or alternative tools
- Glyph Side Bearing Difference
Compare the supplied side bearings of a glyph.
- Variable Font Optical Size Reference Pair
Calculate a variable font's optical-size axis offset from a supplied reference coordinate.