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import type {
MaskDefaultContext,
MaskDefinition,
RectangleMaskParams,
} from "@/masks/types";
import {
BOX_LIKE_MASK_PARAMS,
buildBoxMaskInteraction,
computeBoxMaskParamUpdate,
getDefaultBaseMaskParams,
getStrokeOffset,
rotatePoint,
} from "./box-like";
function getDefaultCinematicBarsMaskParams({
elementSize,
}: MaskDefaultContext): RectangleMaskParams {
const absWidth = Math.abs(elementSize?.width ?? 0);
const absHeight = Math.abs(elementSize?.height ?? 0);
const diagonal =
absWidth > 0 && absHeight > 0
? Math.sqrt(absWidth ** 2 + absHeight ** 2)
: 0;
const fullSpanWidth =
absWidth > 0 ? diagonal / absWidth : Math.SQRT2;
return {
...getDefaultBaseMaskParams(),
centerX: 0,
centerY: 0,
width: Math.max(fullSpanWidth, 1),
height: 0.6,
rotation: 0,
scale: 1,
};
}
function buildBandPath({
centerX,
centerY,
halfWidth,
halfHeight,
rotationRad,
}: {
centerX: number;
centerY: number;
halfWidth: number;
halfHeight: number;
rotationRad: number;
}): Path2D {
const corners = [
{ x: centerX - halfWidth, y: centerY - halfHeight },
{ x: centerX + halfWidth, y: centerY - halfHeight },
{ x: centerX + halfWidth, y: centerY + halfHeight },
{ x: centerX - halfWidth, y: centerY + halfHeight },
].map((point) =>
rotatePoint({
...point,
centerX,
centerY,
rotationRad,
}),
);
const path = new Path2D();
path.moveTo(corners[0].x, corners[0].y);
for (const corner of corners.slice(1)) {
path.lineTo(corner.x, corner.y);
}
path.closePath();
return path;
}
export const cinematicBarsMaskDefinition: MaskDefinition<RectangleMaskParams> = {
type: "cinematic-bars",
name: "Cinematic Bars",
features: {
hasPosition: true,
hasRotation: true,
sizeMode: "height-only",
},
params: BOX_LIKE_MASK_PARAMS,
interaction: buildBoxMaskInteraction({
sizeMode: "height-only",
buildOverlayPath({ width, height }) {
return `M 0,0 H ${width} V ${height} H 0 Z`;
},
}),
buildDefault(context) {
return {
type: "cinematic-bars",
params: getDefaultCinematicBarsMaskParams(context),
};
},
computeParamUpdate: computeBoxMaskParamUpdate,
renderer: {
buildPath({ resolvedParams, width, height }) {
const params = resolvedParams as RectangleMaskParams;
const centerX = width / 2 + params.centerX * width;
const centerY = height / 2 + params.centerY * height;
const maskWidth = Math.max(params.width * width, width);
const maskHeight = Math.max(params.height, 0.01) * height;
const rotationRad = (params.rotation * Math.PI) / 180;
return buildBandPath({
centerX,
centerY,
halfWidth: maskWidth / 2,
halfHeight: maskHeight / 2,
rotationRad,
});
},
buildStrokePath({ resolvedParams, width, height }) {
const params = resolvedParams as RectangleMaskParams;
const centerX = width / 2 + params.centerX * width;
const centerY = height / 2 + params.centerY * height;
const rotationRad = (params.rotation * Math.PI) / 180;
const offset = getStrokeOffset({
strokeAlign: params.strokeAlign,
strokeWidth: params.strokeWidth,
});
return buildBandPath({
centerX,
centerY,
halfWidth: Math.max((Math.max(params.width * width, width) / 2) + offset, 1),
halfHeight: Math.max(
(Math.max(params.height, 0.01) * height) / 2 + offset,
1,
),
rotationRad,
});
},
},
};
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