textblotter.js

calculateMetrics: function(options) {
        // TODO: Normalize line lengths so there are no single-word remainders
        var text = options.text;
        var lines = [];
        var words = text.split(' ');
        var space = fontMap[' '];
        var lineWidth = 0, lineChars = [], maxLineWidth = 0;
        for(var w = 0; w < words.length; w++) {
            var word = words[w];
            if(word == '') continue; // Skip empty words
            var wordWidth = 0;
            var wordChars = [];
            if(lineChars.length > 0) { // Add space before word unless starting a line
                wordChars.push({ x: lineWidth, char: space, w: space.w });
                wordWidth += space.w;
            }
            if(word.length > 1 && fontMap[word]) { // Icon codes
                wordChars.push({ 
                    x: lineWidth + wordWidth, char: fontMap[word], w: fontMap[word].w, oy: -2 
                });
                wordWidth += fontMap[word].w;
            } else {
                for(var a = 0; a < word.length; a++) {
                    var ltr = fontMap[word[a]] || space;
                    wordChars.push({ 
                        x: lineWidth + wordWidth, char: ltr, w: ltr.w, oy: ltr.oy 
                    });
                    wordWidth += ltr.w;
                }
            }
            if(options.maxWidth && lineWidth + wordWidth > options.maxWidth) {
                if(wordWidth > options.maxWidth) { // Word is longer than maxWidth, won't fit any line
                    if(lineWidth > 0) {
                        lines.push({ w: lineWidth, chars: lineChars });
                        maxLineWidth = Math.max(lineWidth, maxLineWidth);
                        lineWidth = 0; lineChars = [];
                    }
                    wordChars = [];
                    wordWidth = 0;
                    for(var b = 0; b < word.length; b++) {
                        var ltrB = fontMap[word[b]] || space;
                        if(lineWidth + wordWidth + ltrB.w < options.maxWidth) {
                            wordChars.push({ 
                                x: lineWidth + wordWidth, char: ltrB, w: ltrB.w, oy: ltrB.oy 
                            });
                            wordWidth += ltrB.w;
                        } else {
                            var trimWidth = (lineWidth + wordWidth + ltrB.w) - options.maxWidth;
                            wordChars.push({ 
                                x: lineWidth + wordWidth, char: ltrB, w: ltrB.w - trimWidth, oy: ltrB.oy 
                            });
                            wordWidth += ltrB.w - trimWidth;
                            break;
                        }
                    }
                    lineWidth += wordWidth;
                    lineChars = lineChars.concat(wordChars);
                } else { // Word can be pushed to next line
                    w--;
                }
                lines.push({ w: lineWidth, chars: lineChars });
                maxLineWidth = Math.max(lineWidth, maxLineWidth);
                lineWidth = 0; lineChars = [];
            } else { // Word fits on line
                lineWidth += wordWidth;
                lineChars = lineChars.concat(wordChars);
                if(w == words.length - 1) {
                    lines.push({ w: lineWidth, chars: lineChars });
                    maxLineWidth = Math.max(lineWidth, maxLineWidth);
                }
            }
        }
        return { lines: lines, text: text, w: maxLineWidth };
    }