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import {directions, type Directed} from '../direction.js'
import {normalizeStruts, type Struts} from '../struts.js'
/**
* An object with a possibly zero padding at every direction.
* @category drawing
*/
export type DirectedPad = Directed<number>
/**
* An object with a possibly zero padding at every direction and a strut for
* each such padding: a pair of _vertical_ struts for the _top_ and _bottom_,
* and a pair of _horizontal_ struts for the _left_ and _right_.
* @category drawing
*/
export interface Padded {
/** How wide/tall should padding be in every direction? */
pad: DirectedPad
/** With what do we fill available pad space in every direction? */
padStruts: Struts
}
/**
* Upgrade a partial {@link DirectedPad} into a total one, filling in empty
* slots with zeros.
* @category drawing
* @function
*/
export const normalizePad = (padded?: Partial<DirectedPad>): DirectedPad => ({
...monoRecord(0)(...directions),
...filterDefined(padded ?? {}),
})
/**
* Upgrade a partial {@link Padded} into a total one, filling in with defaults.
* @category drawing
* @function
*/
export const normalizePadded = (
padded?: Partial<{
pad?: Partial<DirectedPad>
padStruts?: Partial<Struts>
}>,
): Padded => ({
padStruts: normalizeStruts(padded?.padStruts),
pad: normalizePad(padded?.pad),
})
/**
* Compute pad width for the given {@link Padded}.
* @category drawing
* @function
*/
export const computePadWidth = ({pad: {left, right}}: Padded): number =>
left + right
/**
* Compute pad height for the given {@link Padded}.
* @category drawing
* @function
*/
export const computePadHeight = ({pad: {top, bottom}}: Padded): number =>
top + bottom
/**
* Add the width of the given padded to the given width.
* @category drawing
* @function
*/
export const addPadWidth =
({pad: {left, right}}: Padded) =>
(width: number): number =>
left + width + right
/**
* Add the height of the given padded to the given height.
* @category drawing
* @function
*/
export const addPadHeight =
({pad: {top, bottom}}: Padded) =>
(height: number): number =>
top + height + bottom
/**
* Compute padding width/hight for the given {@link Padded}.
* @category drawing
* @function
*/
export const computePadSize = (
padded: Padded,
): [width: number, height: number] => [
computePadWidth(padded),
computePadHeight(padded),
]
/**
* Add the given width and height to the given {@link Padded}.
* @category drawing
* @function
*/
export const addPadSize =
(padded: Padded) =>
(width: number, height: number): [width: number, height: number] => [
width + computePadWidth(padded),
height + computePadHeight(padded),
]
/**
* Build a padding entry for every direction from a partial list of values.
* @category drawing
* @function
*/
export const padding = (
top: number,
right?: number,
bottom?: number,
left?: number,
): DirectedPad =>
right === undefined
? monoRecord(top)(...directions)
: bottom === undefined
? {
...monoRecord(top)('top', 'bottom'),
...monoRecord(right)('left', 'right'),
}
: left === undefined
? {top, bottom, ...monoRecord(right)('left', 'right')}
: {top, right, bottom, left}
/**
* A {@link DirectedPad} of zero padding in all directions.
* @category drawing
*/
export const noPadding: DirectedPad = monoRecord(0)(...directions)
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