neo-blessed/lib/widgets/bigtext.js

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/**
* bigtext.js - bigtext element for blessed
* Copyright (c) 2013-2015, Christopher Jeffrey and contributors (MIT License).
* https://github.com/chjj/blessed
*/
/**
* Modules
*/
var fs = require('fs');
var helpers = require('../helpers');
var Node = require('./node');
var Box = require('./box');
/**
* BigText
*/
function BigText(options) {
if (!(this instanceof Node)) {
return new BigText(options);
}
options = options || {};
options.font = options.font
|| __dirname + '/../../usr/fonts/ter-u14n.json';
options.fontBold = options.font
|| __dirname + '/../../usr/fonts/ter-u14b.json';
this.fch = options.fch;
this.ratio = {};
this.font = this.loadFont(options.font);
this.fontBold = this.loadFont(options.font);
Box.call(this, options);
if (this.style.bold) {
this.font = this.fontBold;
}
}
BigText.prototype.__proto__ = Box.prototype;
BigText.prototype.type = 'bigtext';
BigText.prototype.loadFont = function(filename) {
var self = this
, data
, font;
data = JSON.parse(fs.readFileSync(filename, 'utf8'));
this.ratio.width = data.width;
this.ratio.height = data.height;
function convertLetter(ch, lines) {
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var line, i;
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while (lines.length > self.ratio.height) {
lines.shift();
lines.pop();
}
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lines = lines.map(function(line) {
var chs = line.split('');
chs = chs.map(function(ch) {
return ch === ' ' ? 0 : 1;
});
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while (chs.length < self.ratio.width) {
chs.push(0);
}
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return chs;
});
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while (lines.length < self.ratio.height) {
line = [];
for (i = 0; i < self.ratio.width; i++) {
line.push(0);
}
lines.push(line);
}
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return lines;
}
font = Object.keys(data.glyphs).reduce(function(out, ch) {
var lines = data.glyphs[ch].map;
out[ch] = convertLetter(ch, lines);
return out;
}, {});
delete font[' '];
return font;
};
BigText.prototype.setContent = function(content) {
this.content = '';
this.text = content || '';
};
BigText.prototype.render = function() {
if (this.position.width == null || this._shrinkWidth) {
// if (this.width - this.iwidth < this.ratio.width * this.text.length + 1) {
this.position.width = this.ratio.width * this.text.length + 1;
this._shrinkWidth = true;
// }
}
if (this.position.height == null || this._shrinkHeight) {
// if (this.height - this.iheight < this.ratio.height + 0) {
this.position.height = this.ratio.height + 0;
this._shrinkHeight = true;
// }
}
var coords = this._render();
if (!coords) return;
var lines = this.screen.lines
, left = coords.xi + this.ileft
, top = coords.yi + this.itop
, right = coords.xl - this.iright
, bottom = coords.yl - this.ibottom;
var dattr = this.sattr(this.style)
, bg = dattr & 0x1ff
, fg = (dattr >> 9) & 0x1ff
, flags = (dattr >> 18) & 0x1ff
, attr = (flags << 18) | (bg << 9) | fg;
for (var x = left, i = 0; x < right; x += this.ratio.width, i++) {
var ch = this.text[i];
if (!ch) break;
var map = this.font[ch];
if (!map) continue;
for (var y = top; y < Math.min(bottom, top + this.ratio.height); y++) {
if (!lines[y]) continue;
var mline = map[y - top];
if (!mline) continue;
for (var mx = 0; mx < this.ratio.width; mx++) {
var mcell = mline[mx];
if (mcell == null) break;
if (this.fch && this.fch !== ' ') {
lines[y][x + mx][0] = dattr;
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lines[y][x + mx][1] = mcell === 1 ? this.fch : this.ch;
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} else {
lines[y][x + mx][0] = mcell === 1 ? attr : dattr;
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lines[y][x + mx][1] = mcell === 1 ? ' ' : this.ch;
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}
}
lines[y].dirty = true;
}
}
return coords;
};
/**
* Expose
*/
module.exports = BigText;