'use strict';

exports.__esModule = true;
exports.default = buildRoundedRectangle;

var _earcut = require('earcut');

var _earcut2 = _interopRequireDefault(_earcut);

var _buildLine = require('./buildLine');

var _buildLine2 = _interopRequireDefault(_buildLine);

var _utils = require('../../../utils');

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**
 * Builds a rounded rectangle to draw
 *
 * Ignored from docs since it is not directly exposed.
 *
 * @ignore
 * @private
 * @param {PIXI.WebGLGraphicsData} graphicsData - The graphics object containing all the necessary properties
 * @param {object} webGLData - an object containing all the webGL-specific information to create this shape
 * @param {object} webGLDataNativeLines - an object containing all the webGL-specific information to create nativeLines
 */
function buildRoundedRectangle(graphicsData, webGLData, webGLDataNativeLines) {
    var rrectData = graphicsData.shape;
    var x = rrectData.x;
    var y = rrectData.y;
    var width = rrectData.width;
    var height = rrectData.height;

    var radius = rrectData.radius;

    var recPoints = [];

    recPoints.push(x, y + radius);
    quadraticBezierCurve(x, y + height - radius, x, y + height, x + radius, y + height, recPoints);
    quadraticBezierCurve(x + width - radius, y + height, x + width, y + height, x + width, y + height - radius, recPoints);
    quadraticBezierCurve(x + width, y + radius, x + width, y, x + width - radius, y, recPoints);
    quadraticBezierCurve(x + radius, y, x, y, x, y + radius + 0.0000000001, recPoints);

    // this tiny number deals with the issue that occurs when points overlap and earcut fails to triangulate the item.
    // TODO - fix this properly, this is not very elegant.. but it works for now.

    if (graphicsData.fill) {
        var color = (0, _utils.hex2rgb)(graphicsData.fillColor);
        var alpha = graphicsData.fillAlpha;

        var r = color[0] * alpha;
        var g = color[1] * alpha;
        var b = color[2] * alpha;

        var verts = webGLData.points;
        var indices = webGLData.indices;

        var vecPos = verts.length / 6;

        var triangles = (0, _earcut2.default)(recPoints, null, 2);

        for (var i = 0, j = triangles.length; i < j; i += 3) {
            indices.push(triangles[i] + vecPos);
            indices.push(triangles[i] + vecPos);
            indices.push(triangles[i + 1] + vecPos);
            indices.push(triangles[i + 2] + vecPos);
            indices.push(triangles[i + 2] + vecPos);
        }

        for (var _i = 0, _j = recPoints.length; _i < _j; _i++) {
            verts.push(recPoints[_i], recPoints[++_i], r, g, b, alpha);
        }
    }

    if (graphicsData.lineWidth) {
        var tempPoints = graphicsData.points;

        graphicsData.points = recPoints;

        (0, _buildLine2.default)(graphicsData, webGLData, webGLDataNativeLines);

        graphicsData.points = tempPoints;
    }
}

/**
 * Calculate a single point for a quadratic bezier curve.
 * Utility function used by quadraticBezierCurve.
 * Ignored from docs since it is not directly exposed.
 *
 * @ignore
 * @private
 * @param {number} n1 - first number
 * @param {number} n2 - second number
 * @param {number} perc - percentage
 * @return {number} the result
 *
 */
function getPt(n1, n2, perc) {
    var diff = n2 - n1;

    return n1 + diff * perc;
}

/**
 * Calculate the points for a quadratic bezier curve. (helper function..)
 * Based on: https://stackoverflow.com/questions/785097/how-do-i-implement-a-bezier-curve-in-c
 *
 * Ignored from docs since it is not directly exposed.
 *
 * @ignore
 * @private
 * @param {number} fromX - Origin point x
 * @param {number} fromY - Origin point x
 * @param {number} cpX - Control point x
 * @param {number} cpY - Control point y
 * @param {number} toX - Destination point x
 * @param {number} toY - Destination point y
 * @param {number[]} [out=[]] - The output array to add points into. If not passed, a new array is created.
 * @return {number[]} an array of points
 */
function quadraticBezierCurve(fromX, fromY, cpX, cpY, toX, toY) {
    var out = arguments.length > 6 && arguments[6] !== undefined ? arguments[6] : [];

    var n = 20;
    var points = out;

    var xa = 0;
    var ya = 0;
    var xb = 0;
    var yb = 0;
    var x = 0;
    var y = 0;

    for (var i = 0, j = 0; i <= n; ++i) {
        j = i / n;

        // The Green Line
        xa = getPt(fromX, cpX, j);
        ya = getPt(fromY, cpY, j);
        xb = getPt(cpX, toX, j);
        yb = getPt(cpY, toY, j);

        // The Black Dot
        x = getPt(xa, xb, j);
        y = getPt(ya, yb, j);

        points.push(x, y);
    }

    return points;
}
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