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single underline pixel perfect works with ratio
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| **/.sass-cache/* |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| var multiplyValue = function(value, multiplier){ | ||
| var str = value; | ||
| var m = multiplier; | ||
| var result = str.match(/(\d*\.?\d*)(.*)/); | ||
| //http://stackoverflow.com/questions/2868947/split1px-into-1px-1-px-in-javascript | ||
| return result[1] * m + result[2]; | ||
| } | ||
|
|
||
| var optimalStrokeWidthPos = function(strokeWidth, posY){ | ||
| if ( strokeWidth < 1) { | ||
| posY = Math.round(posY - 0.5) + 0.5; | ||
| } else if ( strokeWidth >= 1 ) { | ||
| strokeWidth = Math.round( strokeWidth ); | ||
| if ( strokeWidth % 2 ){ | ||
| // odd, posY -> 0.5 | ||
| posY = Math.round(posY - 0.5) + 0.5; | ||
| } else { | ||
| // even, posY -> 1 | ||
| posY = Math.round(posY); | ||
| } | ||
| } | ||
| return { | ||
| strokeWidth: strokeWidth, | ||
| posY: posY | ||
| } | ||
| } | ||
|
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| function SingleUnderline(element, underlineStyles, elementStyles) { | ||
| //ctor | ||
| this.element = element; | ||
|
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||
| this.text = this.element.textContent; | ||
|
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| this.underlineStyles = underlineStyles; | ||
|
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| this.elementStyles = elementStyles; | ||
| this.redrawActive = false; | ||
|
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| this.canvas = document.createElement("canvas"); | ||
| this.ctx = this.canvas.getContext('2d'); | ||
|
|
||
| this.ratio = window.devicePixelRatio; | ||
| this.canvas.width = this.elementStyles.width*this.ratio; | ||
| this.canvas.height = this.elementStyles.height*this.ratio; | ||
| this.element.appendChild(this.canvas); | ||
| this.canvas.style.width = this.elementStyles.width + 'px'; | ||
|
|
||
| this.ctx.font = this.font = this.elementStyles.fontStyle + ' ' | ||
| + multiplyValue(this.elementStyles.fontSize, this.ratio) + ' ' | ||
| + this.elementStyles.fontFamily; | ||
|
|
||
| // determine the text-underline-width / strokeWidth | ||
| dotWidth = this.ctx.measureText('.')['width']; | ||
| if (this.underlineStyles['text-underline-width'] == "auto") { | ||
| // if set to auto, calculate the optimized width based on font | ||
| this.strokeWidth = dotWidth/6; | ||
| } else { | ||
| //if set to px value, todo: other unit such as em? | ||
| this.strokeWidth = this.underlineStyles['text-underline-width']; | ||
| //get number value | ||
| this.strokeWidth = parseFloat(this.strokeWidth)*this.ratio; | ||
| } | ||
|
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|
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| // determine the text-underline-position / underlinePosition | ||
| // text-underline-position in ratio, todo: default and user set position ratio | ||
| this.underlinePosition = parseFloat(this.elementStyles.height) * this.ratio * | ||
| (1 - this.elementStyles.baselinePositionRatio | ||
| + this.underlineStyles['text-underline-position']); | ||
|
|
||
| var adjustValue = optimalStrokeWidthPos(this.strokeWidth, this.underlinePosition); | ||
| this.strokeWidth = adjustValue.strokeWidth; | ||
| this.underlinePosition = adjustValue.posY; | ||
|
|
||
| this.textWidth = this.ctx.measureText(this.text).width; | ||
|
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| this.myString = new GuitarString(this.ctx, | ||
| new Point(0, this.underlinePosition), | ||
| new Point(this.textWidth, this.underlinePosition), | ||
| this.strokeWidth, this.underlineStyles['text-underline-color'], this.ratio); | ||
| this.drawHoles(); | ||
|
|
||
| } | ||
|
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| SingleUnderline.prototype.clear = function(){ | ||
| this.redrawActive = this.myString.redrawActive; | ||
| // clear | ||
| if(this.myString.redrawActive) { | ||
| // this.myString.clear(); | ||
| this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height); | ||
| } | ||
| }; | ||
|
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||
|
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| SingleUnderline.prototype.update = function(){ | ||
| // update | ||
| if(this.myString.redrawActive) { | ||
| this.myString.update(); | ||
| // this.drawHoles(); | ||
| } | ||
| }; | ||
|
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|
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| SingleUnderline.prototype.draw = function(){ | ||
| // draw | ||
| if(this.redrawActive) { | ||
| this.drawUnderline(); | ||
| this.drawHoles(); | ||
| } | ||
| }; | ||
|
|
||
| SingleUnderline.prototype.drawUnderline = function(){ | ||
| // draw the underline | ||
| this.myString.draw(); | ||
| } | ||
|
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||
| SingleUnderline.prototype.drawHoles = function(){ | ||
|
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||
| // draw the font stroke | ||
| this.ctx.font = this.font; | ||
| this.ctx.textBaseline = 'top'; | ||
|
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| this.ctx.globalCompositeOperation = "destination-out"; | ||
|
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| this.ctx.lineWidth = 2*this.ratio + this.strokeWidth*2; | ||
| console.log(this.ctx.lineWidth); | ||
| this.ctx.strokeStyle = 'blue'; | ||
| this.ctx.beginPath(); | ||
| this.ctx.strokeText(this.text, 0, 0); | ||
|
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||
| this.ctx.fillStyle = 'green'; | ||
| this.ctx.beginPath(); | ||
| this.ctx.fillText(this.text, -1, 0); | ||
| } | ||
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