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-rw-r--r--apps/web/src/masks/freeform/path.ts835
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diff --git a/apps/web/src/masks/freeform/path.ts b/apps/web/src/masks/freeform/path.ts
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+++ b/apps/web/src/masks/freeform/path.ts
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+import type { ElementBounds } from "@/preview/element-bounds";
+
+export interface FreeformPathPoint {
+ id: string;
+ x: number;
+ y: number;
+ inX: number;
+ inY: number;
+ outX: number;
+ outY: number;
+}
+
+function isFreeformPathPoint(value: unknown): value is FreeformPathPoint {
+ if (!value || typeof value !== "object") {
+ return false;
+ }
+
+ return (
+ "id" in value &&
+ typeof value.id === "string" &&
+ "x" in value &&
+ typeof value.x === "number" &&
+ "y" in value &&
+ typeof value.y === "number" &&
+ "inX" in value &&
+ typeof value.inX === "number" &&
+ "inY" in value &&
+ typeof value.inY === "number" &&
+ "outX" in value &&
+ typeof value.outX === "number" &&
+ "outY" in value &&
+ typeof value.outY === "number"
+ );
+}
+
+export function parseFreeformPath({
+ path,
+}: {
+ path: string;
+}): FreeformPathPoint[] {
+ if (!path) {
+ return [];
+ }
+
+ try {
+ const parsed = JSON.parse(path);
+ return Array.isArray(parsed) ? parsed.filter(isFreeformPathPoint) : [];
+ } catch {
+ return [];
+ }
+}
+
+export function serializeFreeformPath({
+ points,
+}: {
+ points: FreeformPathPoint[];
+}): string {
+ return JSON.stringify(points);
+}
+
+export function removeFreeformPathPoints({
+ points,
+ pointIds,
+}: {
+ points: FreeformPathPoint[];
+ pointIds: string[];
+}): FreeformPathPoint[] {
+ if (pointIds.length === 0) {
+ return points;
+ }
+ const pointIdsToRemove = new Set(pointIds);
+ return points.filter((point) => !pointIdsToRemove.has(point.id));
+}
+
+export function getFreeformPathClosedStateAfterPointRemoval({
+ wasClosed,
+ remainingPointCount,
+}: {
+ wasClosed: boolean;
+ remainingPointCount: number;
+}): boolean {
+ return wasClosed && remainingPointCount >= 3;
+}
+
+function rotatePoint({
+ x,
+ y,
+ rotationDegrees,
+}: {
+ x: number;
+ y: number;
+ rotationDegrees: number;
+}): { x: number; y: number } {
+ const angleRad = (rotationDegrees * Math.PI) / 180;
+ const cos = Math.cos(angleRad);
+ const sin = Math.sin(angleRad);
+ return {
+ x: x * cos - y * sin,
+ y: x * sin + y * cos,
+ };
+}
+
+export function getFreeformCenterCanvasPoint({
+ centerX,
+ centerY,
+ bounds,
+}: {
+ centerX: number;
+ centerY: number;
+ bounds: ElementBounds;
+}): { x: number; y: number } {
+ return {
+ x: bounds.cx + centerX * bounds.width,
+ y: bounds.cy + centerY * bounds.height,
+ };
+}
+
+export function freeformLocalPointToCanvas({
+ point,
+ centerX,
+ centerY,
+ rotation,
+ scale,
+ bounds,
+}: {
+ point: { x: number; y: number };
+ centerX: number;
+ centerY: number;
+ rotation: number;
+ scale: number;
+ bounds: ElementBounds;
+}): { x: number; y: number } {
+ const center = getFreeformCenterCanvasPoint({ centerX, centerY, bounds });
+ const scaledLocal = {
+ x: point.x * bounds.width * scale,
+ y: point.y * bounds.height * scale,
+ };
+ const rotated = rotatePoint({
+ x: scaledLocal.x,
+ y: scaledLocal.y,
+ rotationDegrees: rotation,
+ });
+
+ return {
+ x: center.x + rotated.x,
+ y: center.y + rotated.y,
+ };
+}
+
+export function freeformCanvasPointToLocal({
+ point,
+ centerX,
+ centerY,
+ rotation,
+ scale,
+ bounds,
+}: {
+ point: { x: number; y: number };
+ centerX: number;
+ centerY: number;
+ rotation: number;
+ scale: number;
+ bounds: ElementBounds;
+}): { x: number; y: number } {
+ const center = getFreeformCenterCanvasPoint({ centerX, centerY, bounds });
+ const translated = {
+ x: point.x - center.x,
+ y: point.y - center.y,
+ };
+ const rotated = rotatePoint({
+ x: translated.x,
+ y: translated.y,
+ rotationDegrees: -rotation,
+ });
+
+ return {
+ x: bounds.width === 0 ? 0 : rotated.x / (bounds.width * scale),
+ y: bounds.height === 0 ? 0 : rotated.y / (bounds.height * scale),
+ };
+}
+
+export function getFreeformCanvasGeometry({
+ points,
+ centerX,
+ centerY,
+ rotation,
+ scale,
+ bounds,
+}: {
+ points: FreeformPathPoint[];
+ centerX: number;
+ centerY: number;
+ rotation: number;
+ scale: number;
+ bounds: ElementBounds;
+}) {
+ const anchors = points.map((point) => ({
+ id: point.id,
+ anchor: freeformLocalPointToCanvas({
+ point: { x: point.x, y: point.y },
+ centerX,
+ centerY,
+ rotation,
+ scale,
+ bounds,
+ }),
+ inHandle: freeformLocalPointToCanvas({
+ point: { x: point.x + point.inX, y: point.y + point.inY },
+ centerX,
+ centerY,
+ rotation,
+ scale,
+ bounds,
+ }),
+ outHandle: freeformLocalPointToCanvas({
+ point: { x: point.x + point.outX, y: point.y + point.outY },
+ centerX,
+ centerY,
+ rotation,
+ scale,
+ bounds,
+ }),
+ }));
+
+ const geometryPoints = anchors.flatMap((point) => [
+ point.anchor,
+ point.inHandle,
+ point.outHandle,
+ ]);
+ if (geometryPoints.length === 0) {
+ return {
+ anchors,
+ bounds: null,
+ };
+ }
+
+ const geometryBounds = getCanvasPointBounds({
+ points: geometryPoints,
+ });
+
+ return {
+ anchors,
+ bounds: geometryBounds,
+ };
+}
+
+export interface CanvasPoint {
+ x: number;
+ y: number;
+}
+
+function getCanvasPointBounds({ points }: { points: CanvasPoint[] }): {
+ minX: number;
+ maxX: number;
+ minY: number;
+ maxY: number;
+ width: number;
+ height: number;
+ centerX: number;
+ centerY: number;
+} | null {
+ if (points.length === 0) {
+ return null;
+ }
+
+ const [firstPoint, ...restPoints] = points;
+ let minX = firstPoint.x;
+ let maxX = firstPoint.x;
+ let minY = firstPoint.y;
+ let maxY = firstPoint.y;
+
+ for (const point of restPoints) {
+ minX = Math.min(minX, point.x);
+ maxX = Math.max(maxX, point.x);
+ minY = Math.min(minY, point.y);
+ maxY = Math.max(maxY, point.y);
+ }
+
+ return {
+ minX,
+ maxX,
+ minY,
+ maxY,
+ width: Math.max(1, maxX - minX),
+ height: Math.max(1, maxY - minY),
+ centerX: (minX + maxX) / 2,
+ centerY: (minY + maxY) / 2,
+ };
+}
+
+export interface FreeformCanvasSegment {
+ index: number;
+ startPointId: string;
+ endPointId: string;
+ start: CanvasPoint;
+ startOut: CanvasPoint;
+ endIn: CanvasPoint;
+ end: CanvasPoint;
+ pathData: string;
+}
+
+function clampUnit(value: number): number {
+ return Math.min(1, Math.max(0, value));
+}
+
+function getDistanceSquared({
+ a,
+ b,
+}: {
+ a: CanvasPoint;
+ b: CanvasPoint;
+}): number {
+ const dx = a.x - b.x;
+ const dy = a.y - b.y;
+ return dx * dx + dy * dy;
+}
+
+function lerpPoint({
+ a,
+ b,
+ t,
+}: {
+ a: CanvasPoint;
+ b: CanvasPoint;
+ t: number;
+}): CanvasPoint {
+ return {
+ x: a.x + (b.x - a.x) * t,
+ y: a.y + (b.y - a.y) * t,
+ };
+}
+
+function evaluateCubicBezier({
+ p0,
+ p1,
+ p2,
+ p3,
+ t,
+}: {
+ p0: CanvasPoint;
+ p1: CanvasPoint;
+ p2: CanvasPoint;
+ p3: CanvasPoint;
+ t: number;
+}): CanvasPoint {
+ const oneMinusT = 1 - t;
+ return {
+ x:
+ oneMinusT ** 3 * p0.x +
+ 3 * oneMinusT ** 2 * t * p1.x +
+ 3 * oneMinusT * t ** 2 * p2.x +
+ t ** 3 * p3.x,
+ y:
+ oneMinusT ** 3 * p0.y +
+ 3 * oneMinusT ** 2 * t * p1.y +
+ 3 * oneMinusT * t ** 2 * p2.y +
+ t ** 3 * p3.y,
+ };
+}
+
+function getFreeformSegmentIndices({
+ points,
+ segmentIndex,
+ closed,
+}: {
+ points: FreeformPathPoint[];
+ segmentIndex: number;
+ closed: boolean;
+}): { startIndex: number; endIndex: number } | null {
+ const segmentCount = getFreeformSegmentCount({ points, closed });
+ if (segmentIndex < 0 || segmentIndex >= segmentCount) {
+ return null;
+ }
+
+ return {
+ startIndex: segmentIndex,
+ endIndex: (segmentIndex + 1) % points.length,
+ };
+}
+
+export function getFreeformSegmentCount({
+ points,
+ closed,
+}: {
+ points: FreeformPathPoint[];
+ closed: boolean;
+}): number {
+ if (points.length < 2) {
+ return 0;
+ }
+ return closed ? points.length : points.length - 1;
+}
+
+export function getFreeformCanvasSegments({
+ points,
+ centerX,
+ centerY,
+ rotation,
+ scale,
+ bounds,
+ closed,
+}: {
+ points: FreeformPathPoint[];
+ centerX: number;
+ centerY: number;
+ rotation: number;
+ scale: number;
+ bounds: ElementBounds;
+ closed: boolean;
+}): FreeformCanvasSegment[] {
+ const geometry = getFreeformCanvasGeometry({
+ points,
+ centerX,
+ centerY,
+ rotation,
+ scale,
+ bounds,
+ });
+ const segmentCount = getFreeformSegmentCount({ points, closed });
+
+ return Array.from({ length: segmentCount }, (_, segmentIndex) => {
+ const start = geometry.anchors[segmentIndex];
+ const end = geometry.anchors[(segmentIndex + 1) % geometry.anchors.length];
+ return {
+ index: segmentIndex,
+ startPointId: start.id,
+ endPointId: end.id,
+ start: start.anchor,
+ startOut: start.outHandle,
+ endIn: end.inHandle,
+ end: end.anchor,
+ pathData: `M ${start.anchor.x},${start.anchor.y} C ${start.outHandle.x},${start.outHandle.y} ${end.inHandle.x},${end.inHandle.y} ${end.anchor.x},${end.anchor.y}`,
+ };
+ });
+}
+
+export function findClosestPointOnFreeformSegment({
+ points,
+ segmentIndex,
+ canvasPoint,
+ centerX,
+ centerY,
+ rotation,
+ scale,
+ bounds,
+ closed,
+}: {
+ points: FreeformPathPoint[];
+ segmentIndex: number;
+ canvasPoint: CanvasPoint;
+ centerX: number;
+ centerY: number;
+ rotation: number;
+ scale: number;
+ bounds: ElementBounds;
+ closed: boolean;
+}): { t: number; point: CanvasPoint } | null {
+ const segment = getFreeformCanvasSegments({
+ points,
+ centerX,
+ centerY,
+ rotation,
+ scale,
+ bounds,
+ closed,
+ }).find((candidate) => candidate.index === segmentIndex);
+ if (!segment) {
+ return null;
+ }
+
+ const sampleCount = 24;
+ let bestT = 0;
+ let bestDistanceSquared = getDistanceSquared({
+ a: canvasPoint,
+ b: segment.start,
+ });
+
+ for (let step = 0; step <= sampleCount; step++) {
+ const t = step / sampleCount;
+ const point = evaluateCubicBezier({
+ p0: segment.start,
+ p1: segment.startOut,
+ p2: segment.endIn,
+ p3: segment.end,
+ t,
+ });
+ const distanceSquared = getDistanceSquared({ a: canvasPoint, b: point });
+ if (distanceSquared < bestDistanceSquared) {
+ bestDistanceSquared = distanceSquared;
+ bestT = t;
+ }
+ }
+
+ let searchStep = 1 / sampleCount;
+ for (let iteration = 0; iteration < 8; iteration++) {
+ const candidates = [bestT - searchStep, bestT, bestT + searchStep]
+ .map(clampUnit)
+ .map((t) => ({
+ t,
+ point: evaluateCubicBezier({
+ p0: segment.start,
+ p1: segment.startOut,
+ p2: segment.endIn,
+ p3: segment.end,
+ t,
+ }),
+ }));
+ for (const candidate of candidates) {
+ const distanceSquared = getDistanceSquared({
+ a: canvasPoint,
+ b: candidate.point,
+ });
+ if (distanceSquared < bestDistanceSquared) {
+ bestDistanceSquared = distanceSquared;
+ bestT = candidate.t;
+ }
+ }
+ searchStep /= 2;
+ }
+
+ const clampedT = Math.min(0.999, Math.max(0.001, bestT));
+ return {
+ t: clampedT,
+ point: evaluateCubicBezier({
+ p0: segment.start,
+ p1: segment.startOut,
+ p2: segment.endIn,
+ p3: segment.end,
+ t: clampedT,
+ }),
+ };
+}
+
+export function insertPointIntoFreeformSegment({
+ points,
+ segmentIndex,
+ pointId,
+ t,
+ closed,
+}: {
+ points: FreeformPathPoint[];
+ segmentIndex: number;
+ pointId: string;
+ t: number;
+ closed: boolean;
+}): FreeformPathPoint[] {
+ const indices = getFreeformSegmentIndices({
+ points,
+ segmentIndex,
+ closed,
+ });
+ if (!indices) {
+ return points;
+ }
+
+ const startPoint = points[indices.startIndex];
+ const endPoint = points[indices.endIndex];
+ const clampedT = Math.min(0.999, Math.max(0.001, t));
+ const p0 = { x: startPoint.x, y: startPoint.y };
+ const p1 = {
+ x: startPoint.x + startPoint.outX,
+ y: startPoint.y + startPoint.outY,
+ };
+ const p2 = {
+ x: endPoint.x + endPoint.inX,
+ y: endPoint.y + endPoint.inY,
+ };
+ const p3 = { x: endPoint.x, y: endPoint.y };
+ const p01 = lerpPoint({ a: p0, b: p1, t: clampedT });
+ const p12 = lerpPoint({ a: p1, b: p2, t: clampedT });
+ const p23 = lerpPoint({ a: p2, b: p3, t: clampedT });
+ const p012 = lerpPoint({ a: p01, b: p12, t: clampedT });
+ const p123 = lerpPoint({ a: p12, b: p23, t: clampedT });
+ const splitPoint = lerpPoint({ a: p012, b: p123, t: clampedT });
+
+ const nextPoints = [...points];
+ nextPoints[indices.startIndex] = {
+ ...startPoint,
+ outX: p01.x - startPoint.x,
+ outY: p01.y - startPoint.y,
+ };
+ nextPoints[indices.endIndex] = {
+ ...endPoint,
+ inX: p23.x - endPoint.x,
+ inY: p23.y - endPoint.y,
+ };
+ nextPoints.splice(indices.endIndex, 0, {
+ id: pointId,
+ x: splitPoint.x,
+ y: splitPoint.y,
+ inX: p012.x - splitPoint.x,
+ inY: p012.y - splitPoint.y,
+ outX: p123.x - splitPoint.x,
+ outY: p123.y - splitPoint.y,
+ });
+ return nextPoints;
+}
+
+export function getFreeformLocalBounds({
+ points,
+ bounds,
+}: {
+ points: FreeformPathPoint[];
+ bounds: ElementBounds;
+}) {
+ if (points.length === 0) {
+ return null;
+ }
+
+ const values = points.flatMap((point) => [
+ { x: point.x * bounds.width, y: point.y * bounds.height },
+ {
+ x: (point.x + point.inX) * bounds.width,
+ y: (point.y + point.inY) * bounds.height,
+ },
+ {
+ x: (point.x + point.outX) * bounds.width,
+ y: (point.y + point.outY) * bounds.height,
+ },
+ ]);
+
+ const localBounds = getCanvasPointBounds({
+ points: values,
+ });
+ if (!localBounds) {
+ return null;
+ }
+
+ return {
+ width: localBounds.width,
+ height: localBounds.height,
+ };
+}
+
+export function recenterFreeformPath({
+ points,
+ centerX,
+ centerY,
+ rotation,
+ scale,
+ bounds,
+}: {
+ points: FreeformPathPoint[];
+ centerX: number;
+ centerY: number;
+ rotation: number;
+ scale: number;
+ bounds: ElementBounds;
+}) {
+ if (points.length === 0) {
+ return { centerX, centerY, points };
+ }
+
+ const geometry = getFreeformCanvasGeometry({
+ points,
+ centerX,
+ centerY,
+ rotation,
+ scale,
+ bounds,
+ });
+ if (!geometry.bounds) {
+ return { centerX, centerY, points };
+ }
+
+ const nextCenterCanvas = {
+ x: geometry.bounds.centerX,
+ y: geometry.bounds.centerY,
+ };
+ const nextCenterLocal = {
+ x: bounds.width === 0 ? 0 : (nextCenterCanvas.x - bounds.cx) / bounds.width,
+ y:
+ bounds.height === 0
+ ? 0
+ : (nextCenterCanvas.y - bounds.cy) / bounds.height,
+ };
+
+ const nextPoints = geometry.anchors.map((point) => {
+ const anchor = freeformCanvasPointToLocal({
+ point: point.anchor,
+ centerX: nextCenterLocal.x,
+ centerY: nextCenterLocal.y,
+ rotation,
+ scale,
+ bounds,
+ });
+ const inHandle = freeformCanvasPointToLocal({
+ point: point.inHandle,
+ centerX: nextCenterLocal.x,
+ centerY: nextCenterLocal.y,
+ rotation,
+ scale,
+ bounds,
+ });
+ const outHandle = freeformCanvasPointToLocal({
+ point: point.outHandle,
+ centerX: nextCenterLocal.x,
+ centerY: nextCenterLocal.y,
+ rotation,
+ scale,
+ bounds,
+ });
+
+ return {
+ id: point.id,
+ x: anchor.x,
+ y: anchor.y,
+ inX: inHandle.x - anchor.x,
+ inY: inHandle.y - anchor.y,
+ outX: outHandle.x - anchor.x,
+ outY: outHandle.y - anchor.y,
+ };
+ });
+
+ return {
+ centerX: nextCenterLocal.x,
+ centerY: nextCenterLocal.y,
+ points: nextPoints,
+ };
+}
+
+export function buildFreeformPath2D({
+ points,
+ centerX,
+ centerY,
+ rotation,
+ scale,
+ bounds,
+ closed,
+}: {
+ points: FreeformPathPoint[];
+ centerX: number;
+ centerY: number;
+ rotation: number;
+ scale: number;
+ bounds: ElementBounds;
+ closed: boolean;
+}): Path2D {
+ const path = new Path2D();
+ if (points.length === 0) {
+ return path;
+ }
+
+ const geometry = getFreeformCanvasGeometry({
+ points,
+ centerX,
+ centerY,
+ rotation,
+ scale,
+ bounds,
+ });
+ const anchors = geometry.anchors;
+ path.moveTo(anchors[0].anchor.x, anchors[0].anchor.y);
+
+ for (let index = 1; index < anchors.length; index++) {
+ const previous = anchors[index - 1];
+ const current = anchors[index];
+ path.bezierCurveTo(
+ previous.outHandle.x,
+ previous.outHandle.y,
+ current.inHandle.x,
+ current.inHandle.y,
+ current.anchor.x,
+ current.anchor.y,
+ );
+ }
+
+ if (closed && anchors.length > 1) {
+ const last = anchors[anchors.length - 1];
+ const first = anchors[0];
+ path.bezierCurveTo(
+ last.outHandle.x,
+ last.outHandle.y,
+ first.inHandle.x,
+ first.inHandle.y,
+ first.anchor.x,
+ first.anchor.y,
+ );
+ path.closePath();
+ }
+
+ return path;
+}
+
+export function buildFreeformSvgPath({
+ points,
+ centerX,
+ centerY,
+ rotation,
+ scale,
+ bounds,
+ closed,
+}: {
+ points: FreeformPathPoint[];
+ centerX: number;
+ centerY: number;
+ rotation: number;
+ scale: number;
+ bounds: ElementBounds;
+ closed: boolean;
+}): string {
+ if (points.length === 0) {
+ return "";
+ }
+
+ const geometry = getFreeformCanvasGeometry({
+ points,
+ centerX,
+ centerY,
+ rotation,
+ scale,
+ bounds,
+ });
+ const anchors = geometry.anchors;
+ const segments = [`M ${anchors[0].anchor.x},${anchors[0].anchor.y}`];
+
+ for (let index = 1; index < anchors.length; index++) {
+ const previous = anchors[index - 1];
+ const current = anchors[index];
+ segments.push(
+ `C ${previous.outHandle.x},${previous.outHandle.y} ${current.inHandle.x},${current.inHandle.y} ${current.anchor.x},${current.anchor.y}`,
+ );
+ }
+
+ if (closed && anchors.length > 1) {
+ const last = anchors[anchors.length - 1];
+ const first = anchors[0];
+ segments.push(
+ `C ${last.outHandle.x},${last.outHandle.y} ${first.inHandle.x},${first.inHandle.y} ${first.anchor.x},${first.anchor.y}`,
+ );
+ segments.push("Z");
+ }
+
+ return segments.join(" ");
+}
generated by cgit v1.3.1 (git 2.54.0) at 2026-10-17 10:36:46 +0000