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curvedText.js
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curvedText.js
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/***** Required : http://fabricjs.com *****/
//https://github.com/Skritz/fabric.curvedText
var CurvedText = (function() {
/**
* Constructor
* @method curvedText
* @param canvas
* @param {object} options
*/
function CurvedText( canvas, options ){
// Options
this.opts = options || {};
for ( var prop in CurvedText.defaults ) {
if (prop in this.opts) { continue; }
this.opts[prop] = CurvedText.defaults[prop];
}
this.canvas = canvas;
this.group = new fabric.Group([], {selectable: this.opts.selectable});
this.canvas.add( this.group ) ;
this._forceGroupUpdate();
this.setText( this.opts.text );
}
/**
* @method set
* @param {string} param
* @param value
* @return false if the param name is unknown
*/
CurvedText.prototype.set = function( param, value ) {
if ( this.opts[param] !== undefined ) {
this.opts[param] = value;
if ( param === 'fontSize' || param === 'fontWeight' ) {
this._setFontStyles();
}
if ( param === 'selectable' ) {
this.group.selectable = value;
}
if ( param === 'angle' ) {
this._forceGroupUpdate();
}
this._render();
return true;
} else {
return false;
}
};
/**
* @method get
* @param {string} param
* @return value of param, or false if unknown
*/
CurvedText.prototype.get = function( param ) {
this._render();
if ( this.opts[param] !== undefined ) {
return this.opts[param];
} else {
return false;
}
};
/**
* @method getParams
* @return {object} value of every options
*/
CurvedText.prototype.getParams = function() {
this._render();
return this.opts;
};
/**
* Center the group in canvas
* @method center
* @return {object} with top and left
*/
CurvedText.prototype.center = function() {
this.opts.top = this.canvas.height / 2;
this.opts.left = this.canvas.width / 2;
this._render();
return { top:this.opts.top, left:this.opts.left };
};
/**
* Remove all letters from canvas
* @method remove
*/
CurvedText.prototype.remove = function() {
var size = this.group.size();
for ( var i=size; i>=0; i-- ){
this.group.remove( this.group.item(i) );
}
this.canvas.renderAll();
};
/**
* Used to change the text
* @method setText
* @param {string} newText
*/
CurvedText.prototype.setText = function( newText ) {
while ( newText.length !== 0 && this.group.size() >= newText.length ) {
this.group.remove( this.group.item( this.group.size()-1 ) );
}
for ( var i=0; i<newText.length; i++ ){
if ( this.group.item(i) === undefined ){
var letter = new fabric.Text(newText[i], {
selectable: true
});
this.group.add( letter );
}
else{
this.group.item(i).text = newText[i];
}
}
this.opts.text = newText;
this._setFontStyles();
this._render();
};
/**
* Update font size and weight
* @private
* @method _setFontStyles
*/
CurvedText.prototype._setFontStyles = function() {
for ( var i=0; i<this.group.size(); i++ ){
this.group.item(i).setFontSize( this.opts.fontSize );
this.group.item(i).fontWeight = this.opts.fontWeight ;
}
};
/**
* Force update group scale and angles
* @private
* @method _forceGroupUpdate
*/
CurvedText.prototype._forceGroupUpdate = function() {
this.group.setAngle( this.opts.angle );
this.group.scaleX = this.opts.scaleX;
this.group.scaleY = this.opts.scaleY;
this._render();
};
/**
* calculate the position and angle of each letter
* @private
* @method _render
*/
CurvedText.prototype._render = function() {
var curAngle=0,angleRadians=0, align=0;
// Object may have been moved with drag&drop
if ( this.group.hasMoved() ) {
this.opts.top = this.group.top;
this.opts.left = this.group.left;
}
this.opts.angle = this.group.getAngle();
this.opts.scaleX = this.group.scaleX;
this.opts.scaleY = this.group.scaleY;
// Text align
if ( this.opts.align === 'center' ) {
align = ( this.opts.spacing / 2) * ( this.group.size() - 1) ;
} else if ( this.opts.align === 'right' ) {
align = ( this.opts.spacing ) * ( this.group.size() - 1) ;
}
for ( var i=0; i<this.group.size(); i++) {
// Find coords of each letters (radians : angle*(Math.PI / 180)
if ( this.opts.reverse ) {
curAngle = (-i * parseInt( this.opts.spacing, 10 )) + align;
angleRadians = curAngle * (Math.PI / 180);
this.group.item(i).set( 'top', (Math.cos( angleRadians ) * this.opts.radius) );
this.group.item(i).set( 'left', (-Math.sin( angleRadians ) * this.opts.radius) );
} else {
curAngle = (i * parseInt( this.opts.spacing, 10)) - align;
angleRadians = curAngle * (Math.PI / 180);
this.group.item(i).set( 'top', (-Math.cos( angleRadians ) * this.opts.radius) );
this.group.item(i).set( 'left', (Math.sin( angleRadians ) * this.opts.radius) ) ;
}
this.group.item(i).setAngle( curAngle );
}
// Update group coords
this.group._calcBounds();
this.group._updateObjectsCoords();
this.group.top = this.opts.top;
this.group.left = this.opts.left;
this.group.saveCoords();
this.canvas.renderAll();
};
/**
* Default options
*/
CurvedText.defaults = {
top: 0,
left: 0,
scaleX: 1,
scaleY: 1,
angle: 0,
spacing: 20,
radius: 50,
text: 'Curved text',
align: 'center',
reverse: false,
fontSize: 20,
fontWeight: 'normal',
selectable: true
};
return CurvedText;
})();