{"version":3,"file":"BezierUtils.mjs","sources":["../../src/utils/BezierUtils.ts"],"sourcesContent":["import { curves } from '../const';\n\n/**\n * Utilities for bezier curves\n * @private\n */\nexport class BezierUtils\n{\n /**\n * Calculate length of bezier curve.\n * Analytical solution is impossible, since it involves an integral that does not integrate in general.\n * Therefore numerical solution is used.\n * @private\n * @param fromX - Starting point x\n * @param fromY - Starting point y\n * @param cpX - Control point x\n * @param cpY - Control point y\n * @param cpX2 - Second Control point x\n * @param cpY2 - Second Control point y\n * @param toX - Destination point x\n * @param toY - Destination point y\n * @returns - Length of bezier curve\n */\n static curveLength(\n fromX: number, fromY: number,\n cpX: number, cpY: number,\n cpX2: number, cpY2: number,\n toX: number, toY: number): number\n {\n const n = 10;\n let result = 0.0;\n let t = 0.0;\n let t2 = 0.0;\n let t3 = 0.0;\n let nt = 0.0;\n let nt2 = 0.0;\n let nt3 = 0.0;\n let x = 0.0;\n let y = 0.0;\n let dx = 0.0;\n let dy = 0.0;\n let prevX = fromX;\n let prevY = fromY;\n\n for (let i = 1; i <= n; ++i)\n {\n t = i / n;\n t2 = t * t;\n t3 = t2 * t;\n nt = (1.0 - t);\n nt2 = nt * nt;\n nt3 = nt2 * nt;\n\n x = (nt3 * fromX) + (3.0 * nt2 * t * cpX) + (3.0 * nt * t2 * cpX2) + (t3 * toX);\n y = (nt3 * fromY) + (3.0 * nt2 * t * cpY) + (3 * nt * t2 * cpY2) + (t3 * toY);\n dx = prevX - x;\n dy = prevY - y;\n prevX = x;\n prevY = y;\n\n result += Math.sqrt((dx * dx) + (dy * dy));\n }\n\n return result;\n }\n\n /**\n * Calculate the points for a bezier curve and then draws it.\n *\n * Ignored from docs since it is not directly exposed.\n * @ignore\n * @param cpX - Control point x\n * @param cpY - Control point y\n * @param cpX2 - Second Control point x\n * @param cpY2 - Second Control point y\n * @param toX - Destination point x\n * @param toY - Destination point y\n * @param points - Path array to push points into\n */\n static curveTo(\n cpX: number, cpY: number,\n cpX2: number, cpY2: number,\n toX: number, toY: number,\n points: Array): void\n {\n const fromX = points[points.length - 2];\n const fromY = points[points.length - 1];\n\n points.length -= 2;\n\n const n = curves._segmentsCount(\n BezierUtils.curveLength(fromX, fromY, cpX, cpY, cpX2, cpY2, toX, toY)\n );\n\n let dt = 0;\n let dt2 = 0;\n let dt3 = 0;\n let t2 = 0;\n let t3 = 0;\n\n points.push(fromX, fromY);\n\n for (let i = 1, j = 0; 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