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