126 lines
2.1 KiB
JavaScript
126 lines
2.1 KiB
JavaScript
/**
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* Expose `Progress`.
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*/
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module.exports = Progress;
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/**
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* Initialize a new `Progress` indicator.
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*/
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function Progress() {
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this.percent = 0;
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this.size(0);
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this.fontSize(11);
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this.font('helvetica, arial, sans-serif');
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}
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/**
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* Set progress size to `n`.
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*
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* @param {Number} n
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* @return {Progress} for chaining
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* @api public
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*/
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Progress.prototype.size = function(n){
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this._size = n;
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return this;
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};
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/**
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* Set text to `str`.
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*
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* @param {String} str
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* @return {Progress} for chaining
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* @api public
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*/
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Progress.prototype.text = function(str){
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this._text = str;
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return this;
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};
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/**
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* Set font size to `n`.
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*
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* @param {Number} n
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* @return {Progress} for chaining
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* @api public
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*/
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Progress.prototype.fontSize = function(n){
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this._fontSize = n;
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return this;
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};
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/**
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* Set font `family`.
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*
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* @param {String} family
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* @return {Progress} for chaining
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*/
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Progress.prototype.font = function(family){
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this._font = family;
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return this;
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};
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/**
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* Update percentage to `n`.
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*
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* @param {Number} n
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* @return {Progress} for chaining
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*/
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Progress.prototype.update = function(n){
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this.percent = n;
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return this;
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};
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/**
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* Draw on `ctx`.
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*
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* @param {CanvasRenderingContext2d} ctx
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* @return {Progress} for chaining
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*/
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Progress.prototype.draw = function(ctx){
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try {
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var percent = Math.min(this.percent, 100)
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, size = this._size
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, half = size / 2
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, x = half
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, y = half
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, rad = half - 1
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, fontSize = this._fontSize;
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ctx.font = fontSize + 'px ' + this._font;
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var angle = Math.PI * 2 * (percent / 100);
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ctx.clearRect(0, 0, size, size);
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// outer circle
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ctx.strokeStyle = '#9f9f9f';
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ctx.beginPath();
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ctx.arc(x, y, rad, 0, angle, false);
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ctx.stroke();
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// inner circle
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ctx.strokeStyle = '#eee';
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ctx.beginPath();
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ctx.arc(x, y, rad - 1, 0, angle, true);
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ctx.stroke();
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// text
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var text = this._text || (percent | 0) + '%'
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, w = ctx.measureText(text).width;
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ctx.fillText(
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text
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, x - w / 2 + 1
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, y + fontSize / 2 - 1);
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} catch (ex) {} //don't fail if we can't render progress
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return this;
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};
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