TrafficAccidentVis/heatmap.js at main · arg1998/TrafficAccidentVis · GitHub

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// Labels of row and columns
var myVars = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"]
var myGroups = ["2017", "2018", "2019", "2020", "2021"]


var heatmap_margin = { top: 30, right: 30, bottom: 30, left: 30 },
    width = 800 - heatmap_margin.left - heatmap_margin.right,
    height = 600 - heatmap_margin.top - heatmap_margin.bottom;


svg = d3.select(".calviz")
    .append("svg")
    .attr("width", width + heatmap_margin.left + heatmap_margin.right)
    .attr("height", height + heatmap_margin.top + heatmap_margin.bottom)
    .append("g")
    .attr("transform",
        "translate(" + heatmap_margin.left + "," + heatmap_margin.top + ")");
// Build X scales and axis:
var x = d3.scaleBand()
    .range([0, width])
    .domain(myVars)
    .padding(0.1)

svg.append("g")
    .attr("transform", "translate(0," + 0 + ")")
    .style("font", "14px times")
    .call(d3.axisTop(x).tickSizeInner(0))
    .call(g => g.select(".domain").remove())


// Build X scales and axis:
var y = d3.scaleBand()
    .range([height, 0])
    .domain(myGroups)
    .padding(0.25);
svg.append("g")
    .call(d3.axisLeft(y))
    .call(d3.axisLeft(y).tickSizeInner(0))
    .call(g => g.select(".domain").remove());


function handleRegionChange(region) {
    file_location = ""
    if (region.value == "north"){
        file_location = "../Data/xlsx/north_heatmap.csv"
    }
    else if (region.value == 'mid'){
        file_location = "../Data/xlsx/mid_heatmap.csv"
    }
    else{
        file_location = "../Data/xlsx/south_heatmap.csv"
    }
    drawChart(file_location)
}

async function drawChart(location) {
    function getMinMax() {
        return d3.csv(location).then(function (data) {
            var minVal = d3.min(data, function (d) { return d.value; });
            var maxVal = d3.max(data, function (d) { return d.value; });
            return [minVal, maxVal]
        })
    }

    var minMaxVals = await getMinMax()
    // Build color scale
    var myColor = d3.scaleLinear()
        .range(["#d4e8fa", "#0384ff"])
        .domain([0, 6])


    d3.csv(location).then(function (data) {

        svg.selectAll()
            .data(data, function (d) { return d.year + ':' + d.month; })
            .join("rect")
            .attr("rx", 10)
            .attr("x", function (d) { return x(d.month) })
            .attr("y", function (d) { return y(d.year) })
            .attr("width", x.bandwidth())
            .attr("height", y.bandwidth())
            .style("fill", function (d) { return myColor(d.value) })
        })
}


//Legend Stuff
var svg_legend = d3.select(".calviz_legend")
    .append("svg")
    .attr("width", 500)
    .attr("height", 100)
    .append("g");
// append title
svg_legend.append("text")
    .attr("class", "legendTitle")
    .attr("x", 90)
    .attr("y", 20)
    .text("Accidents Caused Due To Snow/Ice");

svg_legend.append("text")
    .attr("class", "legnedLeft")
    .attr("x", 10)
    .attr("y", 75)
    .style("text-anchor", "left")
    .text("less");

svg_legend.append("text")
    .attr("class", "legnedLeft")
    .attr("x", 385)
    .attr("y", 75)
    .text("more");
// draw the rectangle and fill with gradient
svg_legend.append("rect")
    .attr("x", 10)
    .attr("y", 40)
    .attr("width", 400)
    .attr("height", 15)
    .style("fill", "url(#linear-gradient)");


svg_legend
    .attr("class", "axis")
    .append("g")
    .attr("transform", "translate(0, 40)")


const defs = svg_legend.append("defs")

const linearGradient = defs.append("linearGradient")
    .attr("id", "linear-gradient");

linearGradient
    .attr("x1", "0%")
    .attr("y1", "0%")
    .attr("x2", "100%")
    .attr("y2", "0%");


linearGradient.selectAll("stop")
    .data([
        { offset: "0%", color: "#d4e8fa" },
        { offset: "25%", color: "#a8d6ff" },
        { offset: "50%", color: "#73bdff" },
        { offset: "75%", color: "#359CFF" },
        { offset: "100%", color: "#0384ff" }
    ])
    .enter().append("stop")
    .attr("offset", function (d) {
        return d.offset;
    })
    .attr("stop-color", function (d) {
        return d.color;
    });