D3 Examples - Piano Roll With Lacking Selector Brush

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<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html;charset=utf-8">
    <title>Chronological Diagram of Asia</title>
    <script type="text/javascript" src="nexusUI.js"></script>
    <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/d3@2.10.3/d3.v2.js"></script>
    <!--<script src="https://d3js.org/d3.v4.min.js"></script>-->
    <script type="text/javascript" src="notesOnlyJSON.js"></script>
    <script src="Tone.js"></script>
    <style type="text/css">
        .chart {
            shape-rendering: crispEdges;
        }
​
        .mini text {
            font: 9px sans-serif;
        }
​
        .main text {
            font: 12px sans-serif;
        }
​
        .miniItem0 {
            fill: darksalmon;
            stroke: black;
            stroke-width: 2;
        }
​
        .miniItem1 {
            fill: darkolivegreen;
            fill-opacity: .7;
            stroke: black;
            stroke-width: 2
        }
​
        .miniItem2 {
            fill: slategray;
            fill-opacity: .7;
            stroke: black;
            stroke-width: 2;
        }
        .miniItem3 {
            fill: #59e95e;
            fill-opacity: .7;
            stroke: black;
            stroke-width: 2;
        }
        .miniItem4 {
            fill: slategray;
            fill-opacity: .7;
            stroke: black;
            stroke-width: 2;
        }
        .miniItem5 {
            fill: #e94cbb;
            fill-opacity: .7;
            stroke: black;
            stroke-width: 2;
        }
        .miniItem6 {
            fill: #59e95e;
            fill-opacity: .7;
            stroke: black;
            stroke-width: 2;
        }
        .miniItem7 {
            fill: #2e907f;
            fill-opacity: .7;
            stroke: black;
            stroke-width: 2;
        }
        .miniItem8 {
            fill: #b077e9;
            fill-opacity: .7;
            stroke: black;
            stroke-width: 2;
        }
        .miniItem9 {
            fill: #64326b;
            fill-opacity: .7;
            stroke: black;
            stroke-width: 2;
        }
        .miniItem10 {
            fill: darksalmon;
            stroke: black;
            stroke-width: 2;
        }
​
        .miniItem11{
            fill: darkolivegreen;
            fill-opacity: .7;
            stroke: black;
            stroke-width: 2
        }
​
        .miniItem12 {
            fill: #e9e245;
            fill-opacity: .7;
            stroke: black;
            stroke-width: 2;
        }
        .miniItem13 {
            fill: #59e95e;
            fill-opacity: .7;
            stroke: black;
            stroke-width: 2;
        }
        .miniItem14 {
            fill: #905113;
            fill-opacity: .7;
            stroke: black;
            stroke-width: 2;
        }
        .miniItem15 {
            fill: #e94cbb;
            fill-opacity: .7;
            stroke: black;
            stroke-width: 2;
        }
        .miniItem16 {
            fill: #59e95e;
            fill-opacity: .7;
            stroke: black;
            stroke-width: 2;
        }
        .miniItem17 {
            fill: #319043;
            fill-opacity: .7;
            stroke: black;
            stroke-width: 2;
        }
        .miniItem18 {
            fill: #b077e9;
            fill-opacity: .7;
            stroke: black;
            stroke-width: 2;
        }
        .miniItem19 {
            fill: #64326b;
            fill-opacity: .7;
            stroke: black;
            stroke-width: 2;
        }
        .miniItem20 {
            fill: #64326b;
            fill-opacity: .7;
            stroke: black;
            stroke-width: 2;
        }
​
        .brush .selection {
            fill: none;
        }
​
​
    </style>
</head>
<body>
​
<div id="option2">
    <input name="SelectRegion"
           type="button"
           value="PlaySelectedRegion"
           onclick="playSection()" />
</div>
​
​
<script type="text/javascript">
    //data
    var lanes = ["C3","D3","E3","F3","G3","A3","B3","C4","D4","E4","F4","G4","A4","B4","C5","D5","E5","F5","G5", "A5", "B5"], //21 pitches
​
​
        laneLength = lanes.length,
        timeBegin = 0,
        timeEnd = 65.33326800000005;
​
​
</script>
<script type="text/javascript">
    var m = [20, 15, 15, 120], //top right bottom left
        //m = [20, 5, 15, 120],
        //w = 960 - m[1] - m[3],
        w = 1000 - m[1] - m[3],
        h = 500 - m[0] - m[2],
        miniHeight = laneLength * 18,  //removed *12
        mainHeight = h - miniHeight - 50;
​
    //scales
    var x = d3.scale.linear() //where is this positioned? at the top or bottom? this might be for main
        .domain([timeBegin, timeEnd])
        .range([0, w]);
​
    var y2 = d3.scale.linear()
        .domain([0, laneLength])
        .range([0, miniHeight]);
​
    var zoom = d3.behavior.zoom()
        .scaleExtent([1, 10])
        .on("zoom", zoomed);
​
    var //xAxis = d3.svg.axis().scale(x1).orient("bottom"),
        xAxis2 = d3.svg.axis().scale(x).orient("bottom"),
​
​
        drag = d3.behavior.drag() //when moving rect from left side, other components of rectangle need to be resized   //so we must include this...i think
            .on("drag", dragmove);
​
​
    var brush = d3.svg.brush();
​
    //brush.on('brushend', bindSelect)
​
​
    chart = d3.select("body")
        .append("svg")
        .attr("width", w + m[1] + m[3])
        .attr("height", h + m[0] + m[2])
        .attr("class", "chart")
        .attr('id','mySVG')
        //.call(brush)
        .call(zoom);
​
    var mini = chart.append("g")
        .attr("transform", "translate(" + m[3] + "," + (mainHeight + m[0]) + ")")
        .attr("width", w)
        .attr("height", miniHeight)
        .attr("class", "mini")
        .call(brush.x(x).y(y2).on('brush',notesSelected));
​
    //mini lanes and texts
    mini.append("g").selectAll(".laneLines")
        .data(minimalNotesFinal)
        //.data(notes)
        .enter().append("line")
        .attr("x1", m[1])
        .attr("y1", function(d) {return y2(d.lane);})
        .attr("x2", w)
        .attr("y2", function(d) {return y2(d.lane);})
        .attr("stroke", "lightgray");
​
    mini.append("g").selectAll(".laneText")
        .data(lanes)
        .enter().append("text")
        .text(function(d) {return d;})
        .attr("x", -m[1])
        .attr("y", function(d, i) {return y2(i + .5);})
        .attr("dy", ".5ex")
        .attr("text-anchor", "end")
        .attr("class", "laneText");
​
    mini.append("g")
        .attr("class", "x axis")
        .attr("transform", "translate(0," + miniHeight + ")")
        .call(xAxis2);
​
​
    //mini item rects soon to be brushes
    mini.append("g").selectAll("miniItems")
        .data(minimalNotesFinal)
        .enter().append("rect") //"brush"
        .attr("class", function(d) {return "miniItem" + d.lane;}) //midi
        .attr("x", function(d) {return x(d.time);}) //time
        .attr("y", function(d) {return y2(d.lane + .5) - 5;}) //midi
        .attr("width", function(d) {
            return x(d.duration);})
        .attr("height", 10)
        .on('click', noteClicked)
        .call(drag);
​
    var synth = new Tone.FMSynth().toMaster();
​
    var noteStartTimes = [];
    var notePitch = [];
    var noteDuration = [];
​
    var note;
​
    function notesSelected() {
        note = 0;
        if(brush.empty()){
            note = 0;
        } else{
            var extent = brush.extent();
            var x0 = extent[0][0],
                y0 = extent[0][1],
                x1 = extent[1][0],
                y1 = extent[1][1];
​
            minimalNotesFinal.forEach(function (d, i){
​
                if(x0 <= d.time && d.time <= x1 && y0 <= d.lane+ .5 && d.lane+ .5 <= y1) {  //conflicted on what y should measure up to
                    note += 1;
​
                    noteStartTimes.push(d.time);
                    notePitch.push(d.name);
                    noteDuration.push(d.duration);
​
                    noteStartTimes.length = note;
                    notePitch.length = note;
                    noteDuration.length = note;
​
                }
​
            });
​
​
        }
​
    }
​
    function playSection(){
​
​
        console.log("Selected notes" + note);
​
​
​
        //console.log("Start Time: " + noteStartTimes);
        //console.log("Current Selection Pitches: " + notePitch);
        //console.log("Current Selection Note Duration: " + noteDuration);
​
​
        var noteProperties = [];
​
        for (var i = 0; i <= (note-1); i++){
​
            noteProperties.push({
​
                "startTime" : noteStartTimes[i], //what does this [i] do?
                "pitch" : notePitch[i],
                "duration": noteDuration[i]
            });
​
​
        }
​
        var notePropertiesSorted = noteProperties.sort(function (a,b) {
​
            return a["startTime"] - b["startTime"]
​
        });
​
​
​
        for(var i = 0; i <= (note-1); i++){
​
            notePropertiesSorted.forEach(function (d) {
​
                return synth.triggerAttackRelease(d.pitch, d.duration, d.startTime)
​
            });
​
        }
​
        notePropertiesArray = JSON.stringify(notePropertiesSorted);
        console.log(notePropertiesArray);
​
    }
​
​
​
​
​
    function noteClicked(d, i) { //
        if (d3.event.defaultPrevented) return; // dragged
​
        console.log(d.time);
        console.log(d.duration);
        console.log(d.name);
​
        d3.select(this);
        synth.triggerAttackRelease(d.name, d.duration)
​
​
    }
​
​
​
    function dragmove(d) {
​
        d3.select(this)
​
            .attr("x", d.x = Math.max(0, d3.event.x));
​
    }
​
    function zoomed() {
        mini.attr("transform", "translate(" + d3.event.translate + ")scale(" + d3.event.scale + ")"); }
​
​
​
​
​
</script>
​
</body>
</html>
    