@antv/coord/lib/transforms/shear.js

Toolkit for mapping elements of sets into geometric objects.

"use strict";
var __read = (this && this.__read) || function (o, n) {
    var m = typeof Symbol === "function" && o[Symbol.iterator];
    if (!m) return o;
    var i = m.call(o), r, ar = [], e;
    try {
        while ((n === void 0 || n-- > 0) && !(r = i.next()).done) ar.push(r.value);
    }
    catch (error) { e = { error: error }; }
    finally {
        try {
            if (r && !r.done && (m = i["return"])) m.call(i);
        }
        finally { if (e) throw e.error; }
    }
    return ar;
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.shearY = exports.shearX = void 0;
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
 */
var shearX = function (params, x, y, width, height) {
    var _a = __read(params, 1), theta = _a[0];
    var sx = cot(theta);
    return {
        transform: function (vector) {
            var _a = __read(vector, 2), x = _a[0], y = _a[1];
            var xx = x + y * sx;
            return [xx, y];
        },
        untransform: function (vector) {
            var _a = __read(vector, 2), xx = _a[0], y = _a[1];
            var x = xx - y * sx;
            return [x, y];
        },
    };
};
exports.shearX = shearX;
/**
 * 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
 */
var shearY = function (params, x, y, width, height) {
    var _a = __read(params, 1), theta = _a[0];
    var sy = cot(theta);
    return {
        transform: function (vector) {
            var _a = __read(vector, 2), x = _a[0], y = _a[1];
            var yy = y + x * sy;
            return [x, yy];
        },
        untransform: function (vector) {
            var _a = __read(vector, 2), x = _a[0], yy = _a[1];
            var y = yy - x * sy;
            return [x, y];
        },
    };
};
exports.shearY = shearY;
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