refactor: packages/

1 files changed, 219 insertions, 0 deletions

diff --git a/packages/excalidraw/components/Stats/utils.ts b/packages/excalidraw/components/Stats/utils.ts
new file mode 100644
index 0000000..61555ba
--- /dev/null
+++ b/packages/excalidraw/components/Stats/utils.ts
@@ -0,0 +1,219 @@
+import type { Radians } from "@excalidraw/math";
+import { pointFrom, pointRotateRads } from "@excalidraw/math";
+import {
+  bindOrUnbindLinearElements,
+  updateBoundElements,
+} from "../../element/binding";
+import { mutateElement } from "../../element/mutateElement";
+import { getBoundTextElement } from "../../element/textElement";
+import {
+  isFrameLikeElement,
+  isLinearElement,
+  isTextElement,
+} from "../../element/typeChecks";
+import type {
+  ElementsMap,
+  ExcalidrawElement,
+  NonDeletedExcalidrawElement,
+  NonDeletedSceneElementsMap,
+} from "../../element/types";
+import {
+  getSelectedGroupIds,
+  getElementsInGroup,
+  isInGroup,
+} from "../../groups";
+import type Scene from "../../scene/Scene";
+import type { AppState } from "../../types";
+
+export type StatsInputProperty =
+  | "x"
+  | "y"
+  | "width"
+  | "height"
+  | "angle"
+  | "fontSize"
+  | "gridStep";
+
+export const SMALLEST_DELTA = 0.01;
+
+export const isPropertyEditable = (
+  element: ExcalidrawElement,
+  property: keyof ExcalidrawElement,
+) => {
+  if (property === "height" && isTextElement(element)) {
+    return false;
+  }
+  if (property === "width" && isTextElement(element)) {
+    return false;
+  }
+  if (property === "angle" && isFrameLikeElement(element)) {
+    return false;
+  }
+  return true;
+};
+
+export const getStepSizedValue = (value: number, stepSize: number) => {
+  const v = value + stepSize / 2;
+  return v - (v % stepSize);
+};
+
+export type AtomicUnit = Record<string, true>;
+export const getElementsInAtomicUnit = (
+  atomicUnit: AtomicUnit,
+  elementsMap: ElementsMap,
+  originalElementsMap?: ElementsMap,
+) => {
+  return Object.keys(atomicUnit)
+    .map((id) => ({
+      original: (originalElementsMap ?? elementsMap).get(id),
+      latest: elementsMap.get(id),
+    }))
+    .filter((el) => el.original !== undefined && el.latest !== undefined) as {
+    original: NonDeletedExcalidrawElement;
+    latest: NonDeletedExcalidrawElement;
+  }[];
+};
+
+export const newOrigin = (
+  x1: number,
+  y1: number,
+  w1: number,
+  h1: number,
+  w2: number,
+  h2: number,
+  angle: number,
+) => {
+  /**
+   * The formula below is the result of solving
+   *   rotate(x1, y1, cx1, cy1, angle) = rotate(x2, y2, cx2, cy2, angle)
+   * where rotate is the function defined in math.ts
+   *
+   * This is so that the new origin (x2, y2),
+   * when rotated against the new center (cx2, cy2),
+   * coincides with (x1, y1) rotated against (cx1, cy1)
+   *
+   * The reason for doing this computation is so the element's top left corner
+   * on the canvas remains fixed after any changes in its dimension.
+   */
+
+  return {
+    x:
+      x1 +
+      (w1 - w2) / 2 +
+      ((w2 - w1) / 2) * Math.cos(angle) +
+      ((h1 - h2) / 2) * Math.sin(angle),
+    y:
+      y1 +
+      (h1 - h2) / 2 +
+      ((w2 - w1) / 2) * Math.sin(angle) +
+      ((h2 - h1) / 2) * Math.cos(angle),
+  };
+};
+
+export const moveElement = (
+  newTopLeftX: number,
+  newTopLeftY: number,
+  originalElement: ExcalidrawElement,
+  elementsMap: NonDeletedSceneElementsMap,
+  elements: readonly NonDeletedExcalidrawElement[],
+  scene: Scene,
+  originalElementsMap: ElementsMap,
+  shouldInformMutation = true,
+) => {
+  const latestElement = elementsMap.get(originalElement.id);
+  if (!latestElement) {
+    return;
+  }
+  const [cx, cy] = [
+    originalElement.x + originalElement.width / 2,
+    originalElement.y + originalElement.height / 2,
+  ];
+  const [topLeftX, topLeftY] = pointRotateRads(
+    pointFrom(originalElement.x, originalElement.y),
+    pointFrom(cx, cy),
+    originalElement.angle,
+  );
+
+  const changeInX = newTopLeftX - topLeftX;
+  const changeInY = newTopLeftY - topLeftY;
+
+  const [x, y] = pointRotateRads(
+    pointFrom(newTopLeftX, newTopLeftY),
+    pointFrom(cx + changeInX, cy + changeInY),
+    -originalElement.angle as Radians,
+  );
+
+  mutateElement(
+    latestElement,
+    {
+      x,
+      y,
+    },
+    shouldInformMutation,
+  );
+  updateBindings(latestElement, elementsMap, elements, scene);
+
+  const boundTextElement = getBoundTextElement(
+    originalElement,
+    originalElementsMap,
+  );
+  if (boundTextElement) {
+    const latestBoundTextElement = elementsMap.get(boundTextElement.id);
+    latestBoundTextElement &&
+      mutateElement(
+        latestBoundTextElement,
+        {
+          x: boundTextElement.x + changeInX,
+          y: boundTextElement.y + changeInY,
+        },
+        shouldInformMutation,
+      );
+  }
+};
+
+export const getAtomicUnits = (
+  targetElements: readonly ExcalidrawElement[],
+  appState: AppState,
+) => {
+  const selectedGroupIds = getSelectedGroupIds(appState);
+  const _atomicUnits = selectedGroupIds.map((gid) => {
+    return getElementsInGroup(targetElements, gid).reduce((acc, el) => {
+      acc[el.id] = true;
+      return acc;
+    }, {} as AtomicUnit);
+  });
+  targetElements
+    .filter((el) => !isInGroup(el))
+    .forEach((el) => {
+      _atomicUnits.push({
+        [el.id]: true,
+      });
+    });
+  return _atomicUnits;
+};
+
+export const updateBindings = (
+  latestElement: ExcalidrawElement,
+  elementsMap: NonDeletedSceneElementsMap,
+  elements: readonly NonDeletedExcalidrawElement[],
+  scene: Scene,
+  options?: {
+    simultaneouslyUpdated?: readonly ExcalidrawElement[];
+    newSize?: { width: number; height: number };
+    zoom?: AppState["zoom"];
+  },
+) => {
+  if (isLinearElement(latestElement)) {
+    bindOrUnbindLinearElements(
+      [latestElement],
+      elementsMap,
+      elements,
+      scene,
+      true,
+      [],
+      options?.zoom,
+    );
+  } else {
+    updateBoundElements(latestElement, elementsMap, options);
+  }
+};