refactor: split builtin and freeform masks

Made-with: Cursor

1 files changed, 146 insertions, 0 deletions

diff --git a/apps/web/src/masks/builtin/definitions/star.ts b/apps/web/src/masks/builtin/definitions/star.ts
new file mode 100644
index 00000000..62e9cbc4
--- /dev/null
+++ b/apps/web/src/masks/builtin/definitions/star.ts
@@ -0,0 +1,146 @@
+import type { MaskDefinition } from "@/masks/types";
+import {
+	BOX_LIKE_MASK_PARAMS,
+	buildBoxMaskInteraction,
+	computeBoxMaskParamUpdate,
+	getBoxLikeGeometry,
+	getDefaultSquareMaskParams,
+	getStrokeOffset,
+	rotatePoint,
+} from "../box-like";
+
+const STAR_INNER_RADIUS_RATIO = 0.45;
+const STAR_VERTEX_COUNT = 10;
+
+function buildStarPath({
+	centerX,
+	centerY,
+	halfWidth,
+	halfHeight,
+	rotationRad,
+}: {
+	centerX: number;
+	centerY: number;
+	halfWidth: number;
+	halfHeight: number;
+	rotationRad: number;
+}): Path2D {
+	const path = new Path2D();
+
+	for (let index = 0; index < STAR_VERTEX_COUNT; index++) {
+		const isOuterVertex = index % 2 === 0;
+		const radiusX = isOuterVertex
+			? halfWidth
+			: halfWidth * STAR_INNER_RADIUS_RATIO;
+		const radiusY = isOuterVertex
+			? halfHeight
+			: halfHeight * STAR_INNER_RADIUS_RATIO;
+		const angle = (index * Math.PI) / 5 - Math.PI / 2;
+		const point = rotatePoint({
+			x: centerX + radiusX * Math.cos(angle),
+			y: centerY + radiusY * Math.sin(angle),
+			centerX,
+			centerY,
+			rotationRad,
+		});
+
+		if (index === 0) {
+			path.moveTo(point.x, point.y);
+		} else {
+			path.lineTo(point.x, point.y);
+		}
+	}
+
+	path.closePath();
+	return path;
+}
+
+function buildOverlayStarPath({
+	width,
+	height,
+}: {
+	width: number;
+	height: number;
+}): string {
+	const centerX = width / 2;
+	const centerY = height / 2;
+	const halfWidth = width / 2;
+	const halfHeight = height / 2;
+	const segments: string[] = [];
+
+	for (let index = 0; index < STAR_VERTEX_COUNT; index++) {
+		const isOuterVertex = index % 2 === 0;
+		const radiusX = isOuterVertex
+			? halfWidth
+			: halfWidth * STAR_INNER_RADIUS_RATIO;
+		const radiusY = isOuterVertex
+			? halfHeight
+			: halfHeight * STAR_INNER_RADIUS_RATIO;
+		const angle = (index * Math.PI) / 5 - Math.PI / 2;
+		const x = centerX + radiusX * Math.cos(angle);
+		const y = centerY + radiusY * Math.sin(angle);
+		segments.push(`${index === 0 ? "M" : "L"} ${x},${y}`);
+	}
+
+	return `${segments.join(" ")} Z`;
+}
+
+export const starMaskDefinition: MaskDefinition<"star"> = {
+	type: "star",
+	name: "Star",
+	features: {
+		hasPosition: true,
+		hasRotation: true,
+		sizeMode: "width-height",
+	},
+	params: BOX_LIKE_MASK_PARAMS,
+	interaction: buildBoxMaskInteraction({
+		sizeMode: "width-height",
+		buildOverlayPath({ width, height }) {
+			return buildOverlayStarPath({ width, height });
+		},
+	}),
+	buildDefault(context) {
+		return {
+			type: "star",
+			params: getDefaultSquareMaskParams(context),
+		};
+	},
+	computeParamUpdate: computeBoxMaskParamUpdate,
+	renderer: {
+		body: {
+			kind: "fillPath",
+			buildPath({ resolvedParams, width, height }) {
+				const params = resolvedParams;
+				const { centerX, centerY, maskWidth, maskHeight, rotationRad } =
+					getBoxLikeGeometry({ params, width, height });
+				return buildStarPath({
+					centerX,
+					centerY,
+					halfWidth: maskWidth / 2,
+					halfHeight: maskHeight / 2,
+					rotationRad,
+				});
+			},
+		},
+		stroke: {
+			kind: "strokeFromPath",
+			buildStrokePath({ resolvedParams, width, height }) {
+				const params = resolvedParams;
+				const { centerX, centerY, maskWidth, maskHeight, rotationRad } =
+					getBoxLikeGeometry({ params, width, height });
+				const offset = getStrokeOffset({
+					strokeAlign: params.strokeAlign,
+					strokeWidth: params.strokeWidth,
+				});
+				return buildStarPath({
+					centerX,
+					centerY,
+					halfWidth: Math.max(maskWidth / 2 + offset, 1),
+					halfHeight: Math.max(maskHeight / 2 + offset, 1),
+					rotationRad,
+				});
+			},
+		},
+	},
+};