Creates a square bounding box from an array of x and y points

vertices-to-square.js

/**
 * Create a square bounding box from an array of x and y points
 * @param {array} A collection of objects with x and y coordinates {x, y}
 * @returns {object} Square formatted as {x, y, width, height} from the given vertices
 */
function getBoundingBox (vertices) {
    // Setup basic test properties
    var xMin = Number.POSITIVE_INFINITY,
        yMin = Number.POSITIVE_INFINITY,
        xMax = 0,
        yMax = 0;

    // Loop through and test all vertices to generate x and y coordinates
    for (var i = vertices.length; i--;) {
        // Test x
        if (vertices[i][0] < xMin) {
            xMin = vertices[i][0];
        }
        if (vertices[i][0] > xMax) {
            xMax = vertices[i][0];
        }

        // Test y
        if (vertices[i][1] < yMin) {
            yMin = vertices[i][1];
        }
        if (vertices[i][1] > yMax) {
            yMax = vertices[i][1];
        }
    }

    // Create a square from the passed data
    return {
        x: xMin,
        y: yMin,
        width: xMax - xMin,
        height: yMax - yMin
    };
}