A demo for guitar chord blocks
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June 30, 2016 04:26
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Chord Block
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| height: 200 |
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| <html> | |
| <head> | |
| <script src="https://d3js.org/d3.v4.0.0-alpha.40.min.js"></script> | |
| </head> | |
| <body> | |
| <svg id=block></svg><P> | |
| <button onClick='update()'>Change</button> | |
| <script> | |
| var data1 = { | |
| name:"C", | |
| quality:"maj", | |
| strings:[ | |
| {marker:0}, | |
| {marker:3}, | |
| {marker:2}, | |
| {marker:0}, | |
| {marker:1}, | |
| {marker:0} | |
| ] | |
| } | |
| var data2 = { | |
| name:"G", | |
| quality:"maj", | |
| strings:[ | |
| {marker:3}, | |
| {marker:2}, | |
| {marker:0}, | |
| {marker:0}, | |
| {marker:3}, | |
| {marker:3} | |
| ] | |
| } | |
| var data = data2; | |
| var height = 100; | |
| var width = 100; | |
| var block = d3.select("#block") | |
| .attr("width",width+50) | |
| .attr("height",height+50) | |
| .append("g") | |
| .attr("transform","translate(25,25)"); | |
| var grid = block.append("g"); | |
| for(var i=0;i<data.strings.length;i++){ | |
| var xSpacing = width / (data.strings.length-1); | |
| grid.append("line") | |
| .attr("x1",i*xSpacing) | |
| .attr("y1",0) | |
| .attr("x2",i*xSpacing) | |
| .attr("y2",height) | |
| .style("stroke","black"); | |
| } | |
| var frets = d3.max(data.strings,function(d){return d.marker;}); | |
| for(var i=0;i<=frets;i++){ | |
| var ySpacing = height / frets; | |
| grid.append("line") | |
| .attr("x1",0) | |
| .attr("y1",i*ySpacing) | |
| .attr("x2",width) | |
| .attr("y2",i*ySpacing) | |
| .style("stroke","black"); | |
| } | |
| var stringScale = d3.scaleLinear() | |
| .domain([0,data.strings.length-1]) | |
| .range([0,width]); | |
| var fretScale = d3.scaleLinear() | |
| .domain([0,frets]) | |
| .range([0-height/frets/2,height-height/frets/2]); | |
| var markerGroup = block.append("g").classed("markers",true); | |
| markers = markerGroup.selectAll("cirlce").data(data.strings,function(d,i){return i;}); | |
| markers.enter().append("circle") | |
| .attr("cx",function(d,i){ | |
| return stringScale(i); | |
| }) | |
| .attr("cy",function(d,i){ | |
| return fretScale(d.marker); | |
| }) | |
| .attr("r",function(d,i){ | |
| if(d.marker == 0) {return 0;} | |
| return 10; | |
| }) | |
| .style("stroke","red"); | |
| var inc = 0; | |
| function update(){ | |
| if(inc % 2 == 0){ | |
| data = data1; | |
| } else { | |
| data = data2; | |
| } | |
| inc++; | |
| d3.select(".markers").selectAll("circle") | |
| .data(data.strings,function(d,i){return i;}) | |
| .transition() | |
| .duration(750) | |
| .attr("cx",function(d,i){ | |
| return stringScale(i); | |
| }) | |
| .attr("cy",function(d,i){ | |
| return fretScale(d.marker); | |
| }) | |
| .attr("r",function(d,i){ | |
| if(d.marker == 0) {return 0;} | |
| return 10; | |
| }); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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