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15 lines
4.7 KiB
JavaScript
15 lines
4.7 KiB
JavaScript
function lineGraph(parent,xAccessor,yAccessor){const width=620;const height=420;const gutter=40;const pixelsPerTick=30;function numericTransformer(dataMin,dataMax,pxMin,pxMax){var dataDiff=dataMax-dataMin,pxDiff=pxMax-pxMin,dataRatio=pxDiff/dataDiff,coordRatio=dataDiff/pxDiff;return{toCoord:function(data){return(data-dataMin)*dataRatio+pxMin;},toData:function(coord){return(coord-pxMin)*coordRatio+dataMin;}};}
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function axisRenderer(orientation,transform){var axisGroup=document.createElementNS("http://www.w3.org/2000/svg","g");var axisPath=document.createElementNS("http://www.w3.org/2000/svg","path");axisGroup.setAttribute("class",orientation+"-axis");var xMin=gutter;var xMax=width-gutter;var yMin=height-gutter;var yMax=gutter;if(orientation==="x"){axisPath.setAttribute("d","M "+xMin+" "+yMin+" L "+xMax+" "+yMin);for(var i=xMin;i<=xMax;i++){if((i-xMin)%(pixelsPerTick*3)===0&&i!==xMin){var text=document.createElementNS("http://www.w3.org/2000/svg","text");text.innerHTML=new Date(Math.floor(transform(i))).toLocaleTimeString();text.setAttribute("x",i);text.setAttribute("y",yMin);text.setAttribute("dy","1em");axisGroup.appendChild(text);}}}else{axisPath.setAttribute("d","M "+xMin+" "+yMin+" L "+xMin+" "+yMax);for(var i=yMax;i<=yMin;i++){if((i-yMin)%pixelsPerTick===0&&i!==yMin){var tickGroup=document.createElementNS("http://www.w3.org/2000/svg","g");var gridLine=document.createElementNS("http://www.w3.org/2000/svg","path");text=document.createElementNS("http://www.w3.org/2000/svg","text");text.innerHTML=Math.floor(transform(i));text.setAttribute("x",xMin);text.setAttribute("y",i);text.setAttribute("dx","-.5em");text.setAttribute("dy",".3em");gridLine.setAttribute("d","M "+xMin+" "+i+" L "+xMax+" "+i);tickGroup.appendChild(gridLine);tickGroup.appendChild(text);axisGroup.appendChild(tickGroup);}}}
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axisGroup.appendChild(axisPath);parent.appendChild(axisGroup);}
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function lineRenderer(xAccessor,yAccessor,xTransform,yTransform){var line=document.createElementNS("http://www.w3.org/2000/svg","path");xAccessor.reset();yAccessor.reset();if(!xAccessor.hasNext()||!yAccessor.hasNext()){return;}
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var pathString="M "+xTransform(xAccessor.next())+" "+yTransform(yAccessor.next());while(xAccessor.hasNext()&&yAccessor.hasNext()){pathString+=" L "+
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xTransform(xAccessor.next())+
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" "+
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yTransform(yAccessor.next());}
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line.setAttribute("class","series");line.setAttribute("d",pathString);parent.appendChild(line);}
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function pointRenderer(xAccessor,yAccessor,xTransform,yTransform){var pointGroup=document.createElementNS("http://www.w3.org/2000/svg","g");pointGroup.setAttribute("class","data-points");xAccessor.reset();yAccessor.reset();if(!xAccessor.hasNext()||!yAccessor.hasNext()){return;}
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while(xAccessor.hasNext()&&yAccessor.hasNext()){var xDataValue=xAccessor.next();var x=xTransform(xDataValue);var yDataValue=yAccessor.next();var y=yTransform(yDataValue);var circle=document.createElementNS("http://www.w3.org/2000/svg","circle");circle.setAttribute("cx",x);circle.setAttribute("cy",y);circle.setAttribute("r","4");var text=document.createElementNS("http://www.w3.org/2000/svg","text");text.innerHTML=Math.floor(xDataValue)+" / "+Math.floor(yDataValue);text.setAttribute("x",x);text.setAttribute("y",y);text.setAttribute("dx","1em");text.setAttribute("dy","-.7em");pointGroup.appendChild(circle);pointGroup.appendChild(text);}
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parent.appendChild(pointGroup);}
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xTransform=numericTransformer(xAccessor.min(),xAccessor.max(),0+gutter,width-gutter);yTransform=numericTransformer(yAccessor.min(),yAccessor.max(),height-gutter,0+gutter);axisRenderer("x",xTransform.toData);axisRenderer("y",yTransform.toData);lineRenderer(xAccessor,yAccessor,xTransform.toCoord,yTransform.toCoord);pointRenderer(xAccessor,yAccessor,xTransform.toCoord,yTransform.toCoord);}
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function renderGraphSvg(dataArray,renderId){var figure=document.getElementById(renderId);while(figure.hasChildNodes()){figure.removeChild(figure.lastChild);}
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var svg=document.createElementNS("http://www.w3.org/2000/svg","svg");svg.setAttribute("viewBox","0 0 640 440");svg.setAttribute("preserveAspectRatio","xMidYMid meet");lineGraph(svg,(function(data,min,max){var i=0;return{hasNext:function(){return i<data.length;},next:function(){return data[i++].x;},reset:function(){i=0;},min:function(){return min;},max:function(){return max;}};})(dataArray,Math.min.apply(Math,dataArray.map(function(o){return o.x;})),Math.max.apply(Math,dataArray.map(function(o){return o.x;}))),(function(data,min,max){var i=0;return{hasNext:function(){return i<data.length;},next:function(){return data[i++].y;},reset:function(){i=0;},min:function(){return min;},max:function(){return max;}};})(dataArray,Math.min.apply(Math,dataArray.map(function(o){return o.y;})),Math.max.apply(Math,dataArray.map(function(o){return o.y;}))));figure.appendChild(svg);} |