lazy-widgets/dist/helpers/mergeRects.js

Typescript retained mode GUI for the HTML canvas API

export function mergeRects(rects) {
    const rectCount = rects.length;
    if (rectCount === 0) {
        return null;
    }
    else if (rectCount === 1) {
        return rects[0];
    }
    else {
        const firstRect = rects[0];
        let minX = firstRect[0];
        let minY = firstRect[1];
        let maxX = firstRect[2] + minX;
        let maxY = firstRect[3] + minY;
        for (let i = 1; i < rectCount; i++) {
            const rect = rects[i];
            const x = rect[0];
            const y = rect[1];
            minX = Math.min(minX, x);
            minY = Math.min(minY, y);
            maxX = Math.max(maxX, x + rect[2]);
            maxY = Math.max(maxY, y + rect[3]);
        }
        return [minX, minY, maxX - minX, maxY - minY];
    }
}
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