LineBreakMeasurer.js
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/**
* Word wrapping
*
* @author (Javascript) Dmitry Farafonov
*/
var AttributedStringIterator = function(text){
//this.text = this.rtrim(this.ltrim(text));
text = text.replace(/(\s)+/, " ");
this.text = this.rtrim(text);
/*
if (beginIndex < 0 || beginIndex > endIndex || endIndex > length()) {
throw new IllegalArgumentException("Invalid substring range");
}
*/
this.beginIndex = 0;
this.endIndex = this.text.length;
this.currentIndex = this.beginIndex;
//console.group("[AttributedStringIterator]");
var i = 0;
var string = this.text;
var fullPos = 0;
//console.log("string: \"" + string + "\", length: " + string.length);
this.startWordOffsets = [];
this.startWordOffsets.push(fullPos);
// TODO: remove i 1000
while (i<1000) {
var pos = string.search(/[ \t\n\f-\.\,]/);
if (pos == -1)
break;
// whitespace start
fullPos += pos;
string = string.substr(pos);
////console.log("fullPos: " + fullPos + ", pos: " + pos + ", string: ", string);
// remove whitespaces
var pos = string.search(/[^ \t\n\f-\.\,]/);
if (pos == -1)
break;
// whitespace end
fullPos += pos;
string = string.substr(pos);
////console.log("fullPos: " + fullPos);
this.startWordOffsets.push(fullPos);
i++;
}
//console.log("startWordOffsets: ", this.startWordOffsets);
//console.groupEnd();
};
AttributedStringIterator.prototype = {
getEndIndex: function(pos){
if (typeof(pos) == "undefined")
return this.endIndex;
var string = this.text.substr(pos, this.endIndex - pos);
var posEndOfLine = string.search(/[\n]/);
if (posEndOfLine == -1)
return this.endIndex;
else
return pos + posEndOfLine;
},
getBeginIndex: function(){
return this.beginIndex;
},
isWhitespace: function(pos){
var str = this.text[pos];
var whitespaceChars = " \t\n\f";
return (whitespaceChars.indexOf(str) != -1);
},
isNewLine: function(pos){
var str = this.text[pos];
var whitespaceChars = "\n";
return (whitespaceChars.indexOf(str) != -1);
},
preceding: function(pos){
//console.group("[AttributedStringIterator.preceding]");
for(var i in this.startWordOffsets) {
var startWordOffset = this.startWordOffsets[i];
if (pos < startWordOffset && i>0) {
//console.log("startWordOffset: " + this.startWordOffsets[i-1]);
//console.groupEnd();
return this.startWordOffsets[i-1];
}
}
//console.log("pos: " + pos);
//console.groupEnd();
return this.startWordOffsets[i];
},
following: function(pos){
//console.group("[AttributedStringIterator.following]");
for(var i in this.startWordOffsets) {
var startWordOffset = this.startWordOffsets[i];
if (pos < startWordOffset && i>0) {
//console.log("startWordOffset: " + this.startWordOffsets[i]);
//console.groupEnd();
return this.startWordOffsets[i];
}
}
//console.log("pos: " + pos);
//console.groupEnd();
return this.startWordOffsets[i];
},
ltrim: function(str){
var patt2=/^\s+/g;
return str.replace(patt2, "");
},
rtrim: function(str){
var patt2=/\s+$/g;
return str.replace(patt2, "");
},
getLayout: function(start, limit){
return this.text.substr(start, limit - start);
},
getCharAtPos: function(pos) {
return this.text[pos];
}
};
var LineBreakMeasurer = function(paper, x, y, text, fontAttrs){
this.paper = paper;
this.text = new AttributedStringIterator(text);
this.fontAttrs = fontAttrs;
if (this.text.getEndIndex() - this.text.getBeginIndex() < 1) {
throw {message: "Text must contain at least one character.", code: "IllegalArgumentException"};
}
//this.measurer = new TextMeasurer(paper, this.text, this.fontAttrs);
this.limit = this.text.getEndIndex();
this.pos = this.start = this.text.getBeginIndex();
this.rafaelTextObject = this.paper.text(x, y, this.text.text).attr(fontAttrs).attr("text-anchor", "start");
this.svgTextObject = this.rafaelTextObject[0];
};
LineBreakMeasurer.prototype = {
nextOffset: function(wrappingWidth, offsetLimit, requireNextWord) {
//console.group("[nextOffset]");
var nextOffset = this.pos;
if (this.pos < this.limit) {
if (offsetLimit <= this.pos) {
throw {message: "offsetLimit must be after current position", code: "IllegalArgumentException"};
}
var charAtMaxAdvance = this.getLineBreakIndex(this.pos, wrappingWidth);
//charAtMaxAdvance --;
//console.log("charAtMaxAdvance:", charAtMaxAdvance, ", [" + this.text.getCharAtPos(charAtMaxAdvance) + "]");
if (charAtMaxAdvance == this.limit) {
nextOffset = this.limit;
//console.log("charAtMaxAdvance == this.limit");
} else if (this.text.isNewLine(charAtMaxAdvance)) {
//console.log("isNewLine");
nextOffset = charAtMaxAdvance+1;
} else if (this.text.isWhitespace(charAtMaxAdvance)) {
// TODO: find next noSpaceChar
//return nextOffset;
nextOffset = this.text.following(charAtMaxAdvance);
} else {
// Break is in a word; back up to previous break.
/*
var testPos = charAtMaxAdvance + 1;
if (testPos == this.limit) {
console.error("hbz...");
} else {
nextOffset = this.text.preceding(charAtMaxAdvance);
}
*/
nextOffset = this.text.preceding(charAtMaxAdvance);
if (nextOffset <= this.pos) {
nextOffset = Math.max(this.pos+1, charAtMaxAdvance);
}
}
}
if (nextOffset > offsetLimit) {
nextOffset = offsetLimit;
}
//console.log("nextOffset: " + nextOffset);
//console.groupEnd();
return nextOffset;
},
nextLayout: function(wrappingWidth) {
//console.groupCollapsed("[nextLayout]");
if (this.pos < this.limit) {
var requireNextWord = false;
var layoutLimit = this.nextOffset(wrappingWidth, this.limit, requireNextWord);
//console.log("layoutLimit:", layoutLimit);
if (layoutLimit == this.pos) {
//console.groupEnd();
return null;
}
var result = this.text.getLayout(this.pos, layoutLimit);
//console.log("layout: \"" + result + "\"");
// remove end of line
//var posEndOfLine = this.text.getEndIndex(this.pos);
//if (posEndOfLine < result.length)
// result = result.substr(0, posEndOfLine);
this.pos = layoutLimit;
//console.groupEnd();
return result;
} else {
//console.groupEnd();
return null;
}
},
getLineBreakIndex: function(pos, wrappingWidth) {
//console.group("[getLineBreakIndex]");
//console.log("pos:"+pos + ", text: \""+ this.text.text.replace(/\n/g, "_").substr(pos, 1) + "\"");
var bb = this.rafaelTextObject.getBBox();
var charNum = -1;
try {
var svgPoint = this.svgTextObject.getStartPositionOfChar(pos);
//var dot = this.paper.ellipse(svgPoint.x, svgPoint.y, 1, 1).attr({"stroke-width": 0, fill: Color.blue});
svgPoint.x = svgPoint.x + wrappingWidth;
//svgPoint.y = bb.y;
//console.log("svgPoint:", svgPoint);
//var dot = this.paper.ellipse(svgPoint.x, svgPoint.y, 1, 1).attr({"stroke-width": 0, fill: Color.red});
charNum = this.svgTextObject.getCharNumAtPosition(svgPoint);
} catch (e){
console.warn("getStartPositionOfChar error, pos:" + pos);
/*
var testPos = pos + 1;
if (testPos < this.limit) {
return testPos
}
*/
}
//console.log("charNum:", charNum);
if (charNum == -1) {
//console.groupEnd();
return this.text.getEndIndex(pos);
} else {
// When case there is new line between pos and charnum then use this new line
var newLineIndex = this.text.getEndIndex(pos);
if (newLineIndex < charNum ) {
console.log("newLineIndex <= charNum, newLineIndex:"+newLineIndex+", charNum:"+charNum, "\"" + this.text.text.substr(newLineIndex+1).replace(/\n/g, "?") + "\"");
//console.groupEnd();
return newLineIndex;
}
//var charAtMaxAdvance = this.text.text.substring(charNum, charNum + 1);
var charAtMaxAdvance = this.text.getCharAtPos(charNum);
//console.log("!!charAtMaxAdvance: " + charAtMaxAdvance);
//console.groupEnd();
return charNum;
}
},
getPosition: function() {
return this.pos;
}
};