47 lines
1.4 KiB
TypeScript
47 lines
1.4 KiB
TypeScript
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import { Point } from "./types";
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export function getSizeFromPoints(points: readonly Point[]) {
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const xs = points.map(point => point[0]);
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const ys = points.map(point => point[1]);
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return {
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width: Math.max(...xs) - Math.min(...xs),
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height: Math.max(...ys) - Math.min(...ys),
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};
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}
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export function rescalePoints(
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dimension: 0 | 1,
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nextDimensionSize: number,
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prevPoints: readonly Point[],
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): readonly Point[] {
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const prevDimValues = prevPoints.map(point => point[dimension]);
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const prevMaxDimension = Math.max(...prevDimValues);
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const prevMinDimension = Math.min(...prevDimValues);
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const prevDimensionSize = prevMaxDimension - prevMinDimension;
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const dimensionScaleFactor = nextDimensionSize / prevDimensionSize;
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let nextMinDimension = Infinity;
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const scaledPoints = prevPoints.map(prevPoint =>
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prevPoint.map((value, currentDimension) => {
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if (currentDimension !== dimension) {
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return value;
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}
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const scaledValue = value * dimensionScaleFactor;
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nextMinDimension = Math.min(scaledValue, nextMinDimension);
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return scaledValue;
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}),
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);
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const translation = prevMinDimension - nextMinDimension;
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const nextPoints = scaledPoints.map(
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scaledPoint =>
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scaledPoint.map((value, currentDimension) => {
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return currentDimension === dimension ? value + translation : value;
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}) as [number, number],
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);
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return nextPoints;
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}
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