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simplify

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This commit is contained in:
Ryan Di 2023-11-29 18:13:51 +08:00
parent 02dc00a47e
commit de32256466
1 changed files with 24 additions and 12 deletions
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36
src/zindex.ts
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@ -519,13 +519,13 @@ const randomNumInBetween = (start: number, end: number) => {
return Math.random() * (end - start) + start;
};
export const generateFractionalIndex = ({
start = FRACTIONAL_INDEX_FLOOR,
end = FRACTIONAL_INDEX_CEILING,
}: {
start?: number;
end?: number;
}) => {
export const generateFractionalIndex = (
predecessorElement: ExcalidrawElement | undefined,
successorElement: ExcalidrawElement | undefined,
) => {
const start = getFractionalIndex(predecessorElement, FRACTIONAL_INDEX_FLOOR);
const end = getFractionalIndex(successorElement, FRACTIONAL_INDEX_CEILING);
const nextTemp = randomNumInBetween(start, end);
return (
(randomNumInBetween(nextTemp, end) + randomNumInBetween(start, nextTemp)) /
@ -533,12 +533,24 @@ export const generateFractionalIndex = ({
);
};
/**
*
*/
export const getNextFractionalIndexAt = (
index: number,
allElements: ExcalidrawElement[],
) => {
const predecessor = allElements[index - 1];
const successor = allElements[index + 1];
return generateFractionalIndex(predecessor, successor);
};
/**
* normalize the fractional indicies of the elements in the given array such that
* a. all elements have a fraction index between floor and ceiling as defined above
* b. for every element, its fractional index is greater than its predecessor's and smaller than its successor's
*/
export const normalizeFractionalIndexing = (
allElements: readonly ExcalidrawElement[],
) => {
@ -558,10 +570,10 @@ export const normalizeFractionalIndexing = (
successorElement,
)
) {
const nextFractionalIndex = generateFractionalIndex({
start: getFractionalIndex(predecessorElement, FRACTIONAL_INDEX_FLOOR),
end: getFractionalIndex(successorElement, FRACTIONAL_INDEX_CEILING),
});
const nextFractionalIndex = generateFractionalIndex(
predecessorElement,
successorElement,
);
normalizedElements.push({
...element,