JDR VI8 for CS725@ODU

color_map.js

// http://colorbrewer2.org/

function ColorMap()
{
    // public methods
    this.byConference = function(conference) // no restrictions
    {
        if (bigFive.indexOf(conference) >= 0)
        {
            return colors0[0];
        }

        if (groupOfFive.indexOf(conference) >= 0)
        {
            return colors0[1];
        }

        return colors0[2];
    }

    this.getConferenceColors = function()
    {
        return [
            { category: 'Big Five', color: colors0[0] },
            { category: 'Group Of Five', color: colors0[1] },
            { category: 'Independent', color: colors0[2] }
        ];
    }

    this.byConferenceBlindSafe = function(conference)
    {
        if (bigFive.indexOf(conference) >= 0)
        {
            return colors1[0];
        }

        if (groupOfFive.indexOf(conference) >= 0)
        {
            return colors1[1];
        }

        return colors1[2];
    }

    this.getConferenceBlindSafeColors = function()
    {
        return [
            { category: 'Big Five', color: colors1[0] },
            { category: 'Group Of Five', color: colors1[1] },
            { category: 'Independent', color: colors1[2] }
        ];
    }

    this.byConferencePhotocopySafe = function(conference)
    {
        if (bigFive.indexOf(conference) >= 0)
        {
            return colors2[0];
        }

        if (groupOfFive.indexOf(conference) >= 0)
        {
            return colors2[1];
        }

        return colors2[2];
    }

    this.getConferencePhotocopySafeColors = function()
    {
        return [
            { category: 'Big Five', color: colors2[0] },
            { category: 'Group Of Five', color: colors2[1] },
            { category: 'Independent', color: colors2[2] }
        ];
    }

    this.byBigFive = function(conference) // no restrictions
    {
        var i = bigFive.indexOf(conference);

        if (i >= 0)
        {
            return bigFiveColors[i];
        }
    }

    this.inBigFive = function(conference)
    {
        return bigFive.indexOf(conference) >= 0;
    }

    this.getBigFiveColors = function()
    {
        var categories = [];
        bigFive.forEach(function(v, i) {
            categories.push(
                { category: v, color: bigFiveColors[i] }
            );
        });
        return categories;
    }

    // expect rank, one of { 0, 1, 2, 3, 4 }
    this.fiveByMultiHue = function(rank)
    {
        if (rank < fiveMultiHue.length)
        {
            return fiveMultiHue[rank];
        }
    }

    this.getMultiHueColors = function()
    {
        var categories = [];
        fiveMultiHue.forEach(function(v, i) {
            categories.push(
                { category: 'Rank ' + (i + 1), color: v }
            );
        });
        return categories;
    }

    // see above for rank
    this.fiveBySingleHue = function(rank)
    {
        if (rank < fiveSingleHue.length)
        {
            return fiveSingleHue[rank];
        }
    }

    this.getSingleHueColors = function()
    {
        var categories = [];
        fiveSingleHue.forEach(function(v, i) {
            categories.push(
                { category: 'Rank ' + (i + 1), color: v }
            );
        });
        return categories;
    }

    // private variables
    var bigFive = [ 'SEC', 'ACC', 'Big 12', 'Pac-12', 'Big Ten' ];

    var groupOfFive = [ 'American', 'Sun Belt', 'MWC', 'MAC', 'CUSA' ];

    var fiveMultiHue = [
        '#253494',
        '#2c7fb8',
        '#41b6c4',
        '#a1dab4',
        '#ffffcc'
    ];

    var fiveSingleHue = [
        '#a50f15',
        '#de2d26',
        '#fb6a4a',
        '#fcae91',
        '#fee5d9'
    ];

    var colors0 = [ '#e41a1c', '#377eb8', '#4daf4a' ];
    var colors1 = [ '#1b9e77', '#d95f02', '#7570b3' ];
    var colors2 = [ '#f0f0f0', '#bdbdbd', '#636363' ];
    var bigFiveColors = [ '#e41a1c', '#377eb8', '#4daf4a', '#984ea3', 
                          '#ff7f00'];
}

d3.min.js

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index.html

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8" />
        <title>CS725 VI8</title>
        <script src="d3.min.js" type="text/javascript"></script>
        <style type="text/css">
            .axis path,
            .axis line 
            {
                fill: none;
                stroke: black;
                shape-rendering: crispEdges;
            }

            .axis text,
            .legend-text
            {
                font-family: sans-serif;
                font-size: 10px;
            }

            .hover-label
            {
                font-family: sans-serif;
                font-size: 9px;
                font-weight: bold;
            }
        </style>
    </head>
    <body style="text-align: center;">
        <script src="legend.js" type="text/javascript"></script>
        <script src="setup.js" type="text/javascript"></script>
        <script src="text.js" type="text/javascript"></script>
        <script src="scatterplot.js" type="text/javascript"></script>
        <script src="color_map.js" type="text/javascript"></script>
        <script src="main.js" type="text/javascript"></script>
    </body>
</html>

legend.js

function Legend(g,
                mw = 25,
                mh = 25,
                mp = 10)
{
    // public methods
    this.draw = function(marks)
    {
        var marks = group.selectAll('.legend')
            .data(marks)
            .enter()
            .append('g')
            .attr('class', 'legend');

        marks.append('rect')
            .attr('x', 0)
            .attr('y', function(d, i) {
                return (markHeight + markPadding) * i;
            })
            .attr('width', markWidth)
            .attr('height', markHeight)
            .attr('fill', function(d, i) {
                return d.color;
            });

        marks.append('text')
            .attr('transform', function(d, i) { 
                var x = markWidth + markPadding;
                var y = (markHeight + markPadding) * i;
                y += 16;
                return 'translate(' + x + ',' + y + ')';
            })
            .attr('class', 'legend-text')
            .text(function(d) {
                return d.category;
            });
    }

    // private variables
    var that = this;
    var group = g;
    var markWidth = mw;
    var markHeight = mh;
    var markPadding = mp;
}

LICENSE

main.js

d3.csv('z_passing-stats-2014.csv', function(error, raw) 
{
    function readLabels(d, i)
    {
        return d.name + ', ' + d.school + ', ' + d.conference;
    }

    var dataset = [];
    var color = new ColorMap();

    raw.forEach(function(v, i) {
        dataset.push({ x: Number(v['Passing Attempts']), 
                       y: Number(v['Passing Yards']),
                       name: v['Player'],
                       school: v['School'],
                       conference: v['Conf'] });
    });

    d3.select('body')
        .append('h1')
        .text('JDR VI8 for CS725@ODU');

    d3.select('body')
        .append('h4')
        .text(intro);

    // -------------------------------------------------------------------------

    d3.select('body')
        .append('p')
        .text(problem0);

    var plot0 = new Scatterplot(dataset);
    plot0.draw();

    raw.forEach(function(v, i) {
        dataset[i].color = color.byConference(v['Conf']);
    });

    plot0.recolor();
    plot0.makeHoverLabels(readLabels);

    d3.select('body')
        .append('p')
        .text(explanation0);

    d3.select('body')
        .append('hr');

    // -------------------------------------------------------------------------

    d3.select('body')
        .append('p')
        .text(problem1);

    var plot1 = new Scatterplot(dataset);
    plot1.draw();

    raw.forEach(function(v, i) {
        dataset[i].color = color.byConferenceBlindSafe(v['Conf']);
    });

    plot1.recolor();
    plot1.makeHoverLabels(readLabels);

    d3.select('body')
        .append('p')
        .text(explanation1);

    d3.select('body')
        .append('hr');

    // -------------------------------------------------------------------------
    
    d3.select('body')
        .append('p')
        .text(problem2);

    var plot2 = new Scatterplot(dataset);
    plot2.draw();

    raw.forEach(function(v, i) {
        dataset[i].color = color.byConferencePhotocopySafe(v['Conf']);
    });

    plot2.recolor();
    plot2.makeHoverLabels(readLabels);

    d3.select('body')
        .append('p')
        .text(explanation2);

    d3.select('body')
        .append('hr');

    // -------------------------------------------------------------------------

    d3.select('body')
        .append('p')
        .text(problem3);

    var fiveDataset = [];
    raw.forEach(function(v, i) {
        if (color.inBigFive(v['Conf']))
        {
            fiveDataset.push(dataset[i]);
        }
    });

    var plot3 = new Scatterplot(fiveDataset);
    plot3.draw();

    fiveDataset.forEach(function(v, i) {
        v.color = color.byBigFive(v.conference);
    });

    plot3.recolor();
    plot3.makeHoverLabels(readLabels);

    d3.select('body')
        .append('p')
        .text(explanation3);

    d3.select('body')
        .append('p')
        .text(extraQuestion);

    d3.select('body')
        .append('p')
        .text(extraAnswer);

    d3.select('body')
        .append('hr');

    // -------------------------------------------------------------------------

    d3.select('body')
        .append('p')
        .text(problem4);

    var topFive = [];
    for (var i = 0; i < 5 && i < raw.length; ++i)
    {
        topFive.push(dataset[i]);
    }

    var plot4 = new Scatterplot(topFive);
    plot4.draw();

    topFive.forEach(function(v, i) {
        v.color = color.fiveByMultiHue(i);
    });

    plot4.recolor();
    plot4.makeHoverLabels(readLabels);

    d3.select('body')
        .append('p')
        .text(explanation4);

    d3.select('body')
        .append('hr');

    // -------------------------------------------------------------------------

    d3.select('body')
        .append('p')
        .text(problem5);

    var plot5 = new Scatterplot(topFive);
    plot5.draw();

    topFive.forEach(function(v, i) {
        v.color = color.fiveBySingleHue(i);
    });

    plot5.recolor();
    plot5.makeHoverLabels(readLabels);

    d3.select('body')
        .append('p')
        .text(explanation5);

    // -------------------------------------------------------------------------

    plot0.drawAxisLabels('Passing Yards', 'Passing Attempts');
    plot1.drawAxisLabels('Passing Yards', 'Passing Attempts');
    plot2.drawAxisLabels('Passing Yards', 'Passing Attempts');
    plot3.drawAxisLabels('Passing Yards', 'Passing Attempts');
    plot4.drawAxisLabels('Passing Yards', 'Passing Attempts');
    plot5.drawAxisLabels('Passing Yards', 'Passing Attempts');

    // -------------------------------------------------------------------------

    var mw = 25;
    var mh = 25;
    var mp = 10;
    plot0.drawLegend(color.getConferenceColors(), mw, mh, mp);
    plot1.drawLegend(color.getConferenceBlindSafeColors(), mw, mh, mp);
    plot2.drawLegend(color.getConferencePhotocopySafeColors(), mw, mh, mp);
    plot3.drawLegend(color.getBigFiveColors(), mw, mh, mp);
    plot4.drawLegend(color.getMultiHueColors(), mw, mh, mp);
    plot5.drawLegend(color.getSingleHueColors(), mw, mh, mp);
});

scatterplot.js

function Scatterplot(data,    // object { x, y }
                     w = 640, // width
                     h = 480, // height
                     p = 50,  // padding
                     t = 5,   // ticks
                     r = 4)
{
    // public methods
    this.draw = function()
    {
        if (svg == null)
        {
            // create svg element
            svg = d3.select('body')
                .append('svg')
                .attr('width', width)
                .attr('height', height);

            // create circles
            marks = svg.selectAll('circle')
                .data(dataset)
                .enter()
                .append('circle')
                .attr('cx', function(d) {
                    return xScale(d.x);
                })
                .attr('cy', function(d) {
                    return yScale(d.y);
                })
                .attr('r', radius);

            // create x axis
            svg.append('g')
                .attr('class', 'axis x-axis')
                .attr('transform', 'translate(0,' + (height - padding) + ')')
                .call(xAxis);

            // create y axis
            svg.append('g')
                .attr('class', 'axis y-axis')
                .attr('transform', 'translate(' + padding + ',0)')
                .call(yAxis);
        }
    }

    this.recolor = function()
    {
        if (marks != null)
        {
            marks.style('fill', function(d) { return d.color; });
        }
    }

    // readData: returns text from data by reading implementation-specific 
    // text variables
    this.makeHoverLabels = function(readData)
    {
        if (hoverLabels == null)
        {
            hoverLabels = svg.selectAll('.hover-label')
                .data(dataset)
                .enter()
                .append('text')
                .attr('class', 'hover-label')
                .attr('transform', function(d, i) {
                    return 'translate(' + (xScale(d.x) - 55) + ',' + 
                           (yScale(d.y) - 10) + ')';
                });

            marks.on('mouseover', function(d, i) {
                hoverLabels.each(function(d, j) {
                    if (i == j)
                    {
                        d3.select(this)
                            .text(function(d, i) {
                                return readData(d, i);
                            });
                    }
                })
            })
            .on('mouseout', function(d, i) {
                hoverLabels.each(function(d, j) {
                    if (i == j)
                    {
                        d3.select(this).text('');
                    }
                })
            });
        }
    }

    this.drawAxisLabels = function(vertical, horizontal)
    {
        if (svg != null)
        {
            svg.select('.x-axis')
                .append('text')
                .attr('x', width * 0.80 / 2 )
                .attr('y', -5)
                .text(horizontal);

            svg.select('.y-axis')
                .append('text')
                .attr('transform', 'rotate(-90)')
                .attr('x', -height * 1.10 / 2)
                .attr('y', 10)
                .text(vertical);
        }
    }

    this.drawLegend = function(marks, width, height, padding)
    {
        if (legend == null)
        {
            var group = svg.append('g')
                .attr('transform', 'translate(100, 50)')
            legend = new Legend(group, width, height, padding);
            legend.draw(marks);
        }
    }

    // private variables
    var that = this;

    var dataset = data;

    var width = w;
    var height = h;
    var padding = p;
    var radius = r;

    var ticks = t;

    var xScale = d3.scale.linear()
        .domain([ d3.min(dataset, function(d) { return d.x }) - 50,
                  d3.max(dataset, function(d) { return d.x }) + 50])
        .range([ padding, width - padding * 2]); 

    var yScale = d3.scale.linear()
        .domain([ d3.min(dataset, function(d) { return d.y }) - 50,
                  d3.max(dataset, function(d) { return d.y }) + 50])
        .range([ height - padding, padding ]);

    var xAxis = d3.svg.axis()
        .scale(xScale)
        .orient('bottom')
        .ticks(t);

    var yAxis = d3.svg.axis()
        .scale(yScale)
        .orient('left')
        .ticks(t);

    var svg = null;
    var marks = null;
    var hoverLabels = null;

    var legend = null;
}

setup.js

// expand frame element
d3.select(self.frameElement).style('height', '4100px');

text.js

var intro = 'The data being plotted is Passing Yards vs Passing Attempts.';

var problem0 = '1. Color the marks by if the QB\'s school is in the Big Five, \
                Group of Five, or Independent. -- no restrictions';

var problem1 = '2. Color the marks by if the QB\'s school is in the Big Five, \
                Group of Five, or Independent. -- color-blind safe';

var problem2 = '3. Color the marks by if the QB\'s school is in the Big Five, \
                Group of Five, or Independent. -- photocopy safe';

var problem3 = '4. Plot only QBs from schools in the Big Five conferences. \
                Color the marks by conference. -- no restrictions';

var problem4 = '5. Plot only the top 5 QBs by rank and color the marks by \
                rank. -- choose a multi-hue colormap';

var problem5 = '6. Plot only the top 5 QBs by rank and color the marks by \
                rank. -- choose a single-hue colormap';

var explanation0 = 'Distinctive \
                    hues are appropriate for categorical data, without \
                    implicit ordering. Since this is a small region, \
                    bright, highly saturated colors are used to ensure that \
                    the color coding is distinguishable. The hue channel has \
                    about 6 or 7 discriminable steps. Our categorical data has \
                    3 distinct categories.';

var explanation1 = 'The colors chosen here avoid using only the hue channel \
                    to encode information: the color scheme generated by \
                    ColorBrewer varies in saturation and luminance. \
                    Using alternate channels to encode information produces \
                    color-blind safe visualizations.';

var explanation2 = 'To withstand black and white photocopy we must effectively \
                    manipulate the luminance channel with the colors chosen. \
                    The color scheme chosen achieves this by preserving \
                    differences in lightness between the colors selected.';

var explanation3 = 'Again, we pick distinctive hues for categorical data. \
                    There are only 5 conferences in the Big Five, so we\'re \
                    still good with the 6 to 7 discriminable steps from the \
                    hue channel.';

var explanation4 = 'The color scheme chosen here is appropriate for the \
                    reasons explained in problems 1 and 4. We\'re only \
                    plotting the top 5 ranks, so we\'re within the 6 or 7 \
                    discriminable step limit of the hue channel. The catch is \
                    that hue\'s not particularly suited to encoding order. \
                    A distinct color is associated to each rank, but to \
                    discover which colors are associated to higher ranks \
                    and which to lower ranks, you\'ll have to hover your \
                    mouse over the marks or rely on positioning in the \
                    scatterplot.';

var explanation5 = 'By using only a single color hue, we can rely on the \
                    luminance and saturation channels to encode rank. \
                    These channels are suited for encoding ordered data. \
                    The luminance channel (the one used in this plot) \
                    has 5 or less discriminable steps, \
                    which is enough to encode our top 5 ranks. Darker colors \
                    have been associated with higher ranks (Marcus Mariota), \
                    and lighter colors have been associated with lower ranks \
                    (Jake Waters).';

var extraQuestion = 'Can you do a color-blind safe or photocopy safe version? \
                     why or why not?';

var extraAnswer = 'If the data being encoded were sequential, we might be able \
                   to get away with making only a color-blind safe version of \
                   the plot by encoding via the luminance channel, which can \
                   have up to 5 discriminable steps. But, because the data \
                   being encoded is qualitative we do not obtain enough \
                   discriminable steps from either the luminance \
                   or saturation channels to encode our 5 categories. \
                   Encoding via saturation is not possible because this \
                   channel has at most 3 discriminable steps. \
                   In any case, photocopy versions cannot be made of this \
                   plot. The book suggests avoiding grayscale (luminance) \
                   if more than two to four bins are required. The luminance \
                   channel must be preserved for photocopy safe vis design.';

z_passing-stats-2014.csv