1 files changed, 63 insertions, 0 deletions
diff --git a/packages/excalidraw/points.ts b/packages/excalidraw/points.ts
new file mode 100644
index 0000000..9d48857
--- /dev/null
+++ b/packages/excalidraw/points.ts
@@ -0,0 +1,63 @@
+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;
+};