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import {
pointFromPair,
type GlobalPoint,
type LocalPoint,
} from "@excalidraw/math";
export const getSizeFromPoints = (
points: readonly (GlobalPoint | LocalPoint)[],
) => {
const xs = points.map((point) => point[0]);
const ys = points.map((point) => point[1]);
return {
width: Math.max(...xs) - Math.min(...xs),
height: Math.max(...ys) - Math.min(...ys),
};
};
/** @arg dimension, 0 for rescaling only x, 1 for y */
export const rescalePoints = <Point extends GlobalPoint | LocalPoint>(
dimension: 0 | 1,
newSize: number,
points: readonly Point[],
normalize: boolean,
): Point[] => {
const coordinates = points.map((point) => point[dimension]);
const maxCoordinate = Math.max(...coordinates);
const minCoordinate = Math.min(...coordinates);
const size = maxCoordinate - minCoordinate;
const scale = size === 0 ? 1 : newSize / size;
let nextMinCoordinate = Infinity;
const scaledPoints = points.map((point): Point => {
const newCoordinate = point[dimension] * scale;
const newPoint = [...point];
newPoint[dimension] = newCoordinate;
if (newCoordinate < nextMinCoordinate) {
nextMinCoordinate = newCoordinate;
}
return newPoint as Point;
});
if (!normalize) {
return scaledPoints;
}
if (scaledPoints.length === 2) {
// we don't translate two-point lines
return scaledPoints;
}
const translation = minCoordinate - nextMinCoordinate;
const nextPoints = scaledPoints.map((scaledPoint) =>
pointFromPair<Point>(
scaledPoint.map((value, currentDimension) => {
return currentDimension === dimension ? value + translation : value;
}) as [number, number],
),
);
return nextPoints;
};
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