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                            **文字換行**
CanvasRenderingContext2D.prototype.wrapText \=  function (text, x, y, maxWidth, lineHeight) {

if (typeof text !=  'string'  ||  typeof x !=  'number'  ||  typeof y !=  'number') {

return;

}

var context \=  this;

var canvas \= context.canvas;

if (typeof maxWidth \==  'undefined') {

maxWidth \= (canvas && canvas.width) ||  300;

}

if (typeof lineHeight \==  'undefined') {

lineHeight \= (canvas && parseInt(window.getComputedStyle(canvas).lineHeight)) || parseInt(window.getComputedStyle(document.body).lineHeight);

}

// 字符分隔為數組

var arrText \= text.split('');

var line \=  '';

for (var n \=  0; n < arrText.length; n++) {

var testLine \= line + arrText\[n\];

var metrics \= context.measureText(testLine);

var testWidth \= metrics.width;

if (testWidth \> maxWidth && n \>  0) {

context.fillText(line, x, y);

line \= arrText\[n\];

y += lineHeight;

} else {

line \= testLine;

}

}

context.fillText(line, x, y);

};
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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