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import BBox from '../glyph/BBox';
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import * as Script from '../layout/Script';
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/**
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* Represents a run of Glyph and GlyphPosition objects.
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* Returned by the font layout method.
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*/
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export default class GlyphRun {
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constructor(glyphs, features, script, language, direction) {
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/**
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* An array of Glyph objects in the run
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* @type {Glyph[]}
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*/
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this.glyphs = glyphs;
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/**
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* An array of GlyphPosition objects for each glyph in the run
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* @type {GlyphPosition[]}
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*/
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this.positions = null;
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/**
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* The script that was requested for shaping. This was either passed in or detected automatically.
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* @type {string}
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*/
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this.script = script;
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/**
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* The language requested for shaping, as passed in. If `null`, the default language for the
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* script was used.
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* @type {string}
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*/
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this.language = language || null;
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/**
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* The direction requested for shaping, as passed in (either ltr or rtl).
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* If `null`, the default direction of the script is used.
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* @type {string}
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*/
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this.direction = direction || Script.direction(script);
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/**
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* The features requested during shaping. This is a combination of user
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* specified features and features chosen by the shaper.
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* @type {object}
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*/
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this.features = {};
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// Convert features to an object
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if (Array.isArray(features)) {
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for (let tag of features) {
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this.features[tag] = true;
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}
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} else if (typeof features === 'object') {
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this.features = features;
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}
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}
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/**
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* The total advance width of the run.
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* @type {number}
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*/
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get advanceWidth() {
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let width = 0;
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for (let position of this.positions) {
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width += position.xAdvance;
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}
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return width;
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}
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/**
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* The total advance height of the run.
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* @type {number}
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*/
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get advanceHeight() {
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let height = 0;
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for (let position of this.positions) {
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height += position.yAdvance;
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}
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return height;
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}
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/**
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* The bounding box containing all glyphs in the run.
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* @type {BBox}
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*/
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get bbox() {
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let bbox = new BBox;
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let x = 0;
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let y = 0;
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for (let index = 0; index < this.glyphs.length; index++) {
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let glyph = this.glyphs[index];
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let p = this.positions[index];
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let b = glyph.bbox;
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bbox.addPoint(b.minX + x + p.xOffset, b.minY + y + p.yOffset);
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bbox.addPoint(b.maxX + x + p.xOffset, b.maxY + y + p.yOffset);
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x += p.xAdvance;
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y += p.yAdvance;
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}
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return bbox;
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}
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}
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