/*=========================================================================================

    File Name: focus-context.js

    Description: d3 focust + context via brushing chart

    ----------------------------------------------------------------------------------------

    Item Name: Modern Admin - Clean Bootstrap 4 Dashboard HTML Template

    Author: PIXINVENT

    Author URL: http://www.themeforest.net/user/pixinvent

==========================================================================================*/



// Focus context chart

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

$(window).on("load", function(){



    var ele = d3.select("#focus-context"),

    margin = {top: 10, right: 10, bottom: 100, left: 40},

    margin2 = {top: 430, right: 10, bottom: 20, left: 40},

    width = ele.node().getBoundingClientRect().width - margin.left - margin.right,

    height = 500 - margin.top - margin.bottom;

    height2 = 500 - margin2.top - margin2.bottom;



    var parseDate = d3.time.format("%b %Y").parse;





    // Scales

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



    var x = d3.time.scale().range([0, width]),

        x2 = d3.time.scale().range([0, width]),

        y = d3.scale.linear().range([height, 0]),

        y2 = d3.scale.linear().range([height2, 0]);



    // Axis

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

    var xAxis = d3.svg.axis().scale(x).orient("bottom"),

        xAxis2 = d3.svg.axis().scale(x2).orient("bottom"),

        yAxis = d3.svg.axis().scale(y).orient("left");



    // Brush

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

    var brush = d3.svg.brush()

        .x(x2)

        .on("brush", brushed);



    // Chart

    var area = d3.svg.area()

        .interpolate("monotone")

        .x(function(d) { return x(d.date); })

        .y0(height)

        .y1(function(d) { return y(d.price); });



    var area2 = d3.svg.area()

        .interpolate("monotone")

        .x(function(d) { return x2(d.date); })

        .y0(height2)

        .y1(function(d) { return y2(d.price); });



    var container = ele.append("svg");



    var svg = container

        .attr("width", width + margin.left + margin.right)

        .attr("height", height + margin.top + margin.bottom);



    svg.append("defs").append("clipPath")

        .attr("id", "clip")

    .append("rect")

        .attr("width", width)

        .attr("height", height);



    var focus = svg.append("g")

        .attr("class", "focus")

        .attr("transform", "translate(" + margin.left + "," + margin.top + ")");



    var context = svg.append("g")

        .attr("class", "context")

        .attr("transform", "translate(" + margin2.left + "," + margin2.top + ")");



    // Load data

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



    d3.csv("../../../app-assets/data/d3/line/focus-context.csv", type, function(error, data) {

        if (error) throw error;



        x.domain(d3.extent(data.map(function(d) { return d.date; })));

        y.domain([0, d3.max(data.map(function(d) { return d.price; }))]);

        x2.domain(x.domain());

        y2.domain(y.domain());





        focus.append("path")

            .datum(data)

            .attr("class", "d3-area d3-focus-area")

            .attr("d", area)

            .style("fill", "#5C6BC0");



        focus.append("g")

            .attr("class", "d3-axis d3-xaxis")

            .attr("transform", "translate(0," + height + ")")

            .call(xAxis);



        focus.append("g")

            .attr("class", "d3-axis d3-yaxis")

            .call(yAxis);



        context.append("path")

            .datum(data)

            .attr("class", "d3-area d3-context-area")

            .attr("d", area2)

            .style("fill", "#5C6BC0");



        context.append("g")

            .attr("class", "d3-axis d3-xaxis")

            .attr("transform", "translate(0," + height2 + ")")

            .call(xAxis2);



        context.append("g")

            .attr("class", "d3-xbrush")

            .call(brush)

        .selectAll("rect")

            .attr("y", -6)

            .attr("height", height2 + 7)

            .style("fill-opacity", ".225");

    });



    function brushed() {

        x.domain(brush.empty() ? x2.domain() : brush.extent());

        focus.select(".d3-area").attr("d", area);

        focus.select("d3-xaxis").call(xAxis);

    }



    function type(d) {

        d.date = parseDate(d.date);

        d.price = +d.price;

        return d;

    }



    // Resize chart

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



    // Call function on window resize

    $(window).on('resize', resize);



    // Call function on sidebar width change

    $('.menu-toggle').on('click', resize);



    // Resize function

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

    function resize() {



        width = ele.node().getBoundingClientRect().width - margin.left - margin.right;



        // Main svg width

        container.attr("width", width + margin.left + margin.right);



        // Width of appended group

        svg.attr("width", width + margin.left + margin.right);





        // Axis

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

        x.range([0, width]);

        x2.range([0, width]);

        svg.selectAll('.d3-xaxis').call(xAxis);





        svg.selectAll('.d3-focus-area').attr("d", area);

        svg.selectAll('.d3-context-area').attr("d", area2);

    }

});