swOperation/node_modules/@antv/coord/esm/transforms/shear.js

function cot(theta) {
    return 1 / Math.tan(theta);
}
/**
 * Applies shear transformation for the first dimension of vector2.
 * @param params [tx, ty]
 * @param x x of the the bounding box of coordinate
 * @param y y of the the bounding box of coordinate
 * @param width width of the the bounding box of coordinate
 * @param height height of the the bounding box of coordinate
 * @returns transformer
 */
export var shearX = function (params, x, y, width, height) {
    var theta = params[0];
    var sx = cot(theta);
    return {
        transform: function (vector) {
            var x = vector[0], y = vector[1];
            var xx = x + y * sx;
            return [xx, y];
        },
        untransform: function (vector) {
            var xx = vector[0], y = vector[1];
            var x = xx - y * sx;
            return [x, y];
        },
    };
};
/**
 * Applies shear transformation for the second dimension of vector2.
 * @param params [tx, ty]
 * @param x x of the the bounding box of coordinate
 * @param y y of the the bounding box of coordinate
 * @param width width of the the bounding box of coordinate
 * @param height height of the the bounding box of coordinate
 * @returns transformer
 */
export var shearY = function (params, x, y, width, height) {
    var theta = params[0];
    var sy = cot(theta);
    return {
        transform: function (vector) {
            var x = vector[0], y = vector[1];
            var yy = y + x * sy;
            return [x, yy];
        },
        untransform: function (vector) {
            var x = vector[0], yy = vector[1];
            var y = yy - x * sy;
            return [x, y];
        },
    };
};
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