Rolling hills

_.md

[ Launch: Tributary inlet ] 4747891 by enjalot

See Previous Inlet [ Gist ]

config.json

{"description":"Rolling hills","endpoint":"","display":"svg","public":true,"require":[],"fileconfigs":{"_.md":{"default":true,"vim":false,"emacs":false,"fontSize":12},"config.json":{"default":true,"vim":false,"emacs":false,"fontSize":12},"inlet.js":{"default":true,"vim":false,"emacs":false,"fontSize":12},"inlet.svg":{"default":true,"vim":false,"emacs":false,"fontSize":12},"img.svg":{"default":true,"vim":false,"emacs":false,"fontSize":12}},"fullscreen":false,"play":false,"loop":false,"restart":false,"autoinit":true,"pause":true,"loop_type":"period","bv":false,"nclones":15,"clone_opacity":0.4,"duration":3000,"ease":"linear","dt":0.01,"editor_editor":{"coffee":false,"vim":false,"emacs":false,"width":600,"height":300,"hide":false},"thumbnail":"http://i.imgur.com/IjvKuKS.png"}

img.svg

inlet.js

//Try changing all these parameters
//Layout properties
var n = 16;
var m = 30;
trib.spacing = 13.92307;
trib.opacity = 0.69888; trib_options.opacity = {"min":0, "max":1};
trib.stroke_width = 4;

//Sin wave function
//y = amplitude * sin( omega * theta + phase)
trib.amplitude = 22;
trib.theta = 10;
trib.omega = 0.273;
trib.phase = 0.71802;

var dy = -397;


var colors = [
    '#DD076F'
    , '#C8DF4D'
    , '#FFA300'
    , '#C59008'
    
]

var svg = d3.select("svg");

svg.select("#hills")
.attr({
  width: tributary.sw,
  height: tributary.sh
})

//interpolate over multiple colors
var color_scale = function(i) {
    var num_interps = colors.length -1
    
    var ord = d3.scale.linear()
        .domain([0, n])
        .range([0, num_interps])
    
    var section = parseInt(ord(i))
    //console.log("section", section)
    var section_size = n / num_interps
    //get the two colors we want to interpolate between
    var col_range = [colors[section], colors[section+1]]
    
    var col_scale = d3.scale.linear()
        .domain([section * section_size, (section+1) * section_size])
        //.interpolate(d3.interpolateRgb)
        .interpolate(d3.interpolateHsl)
        .range(col_range)
    
    return col_scale(i)
    
}
/*
var color = d3.scale.linear()
    .domain([0, n])
    //.interpolate(d3.interpolateRgb)
    .interpolate(d3.interpolateHsl)
    .range(['#D40067', '#4DA9DF'])
*/    
var color = color_scale



var sw = tributary.sw * 1.1;//parseInt(d3.select("svg").style("width"))
//make the sin waves extend past the width a little
//sw += .1 * sw
var sh = tributary.sh;//parseInt(d3.select("svg").style("height"))


var lines = [ ];
for (i in d3.range(n)) {

    var data = d3.range(m) 
    lines.push({ 
        index: i-n,
        data: data
    })
}

var xscale = d3.scale.linear()
    .domain([0, m])
    .range([-.1*sw, sw])

function line_maker( data ) {
    var freq = trib.omega * data.index
    var svgline = d3.svg.line()
        .x(function(d,i) {
            return xscale(d);
        })
        .y(function(d,i) {
            var th = d/m * trib.theta
            var ph = (n-data.index) * trib.phase
            var y = trib.amplitude * Math.sin(freq * th + ph );
            return y
        })
        .interpolate("basis")
        //.interpolate("linear")
    return svgline(data.data);
}

function lineenter(d, i) {
    d3.select(this).selectAll("path.path")
        .data([d])
        .enter()
    .append("svg:path")
        .attr("class", "path")
        .attr("stroke-width", trib.stroke_width)
        //.attr("stroke-width", function(e,i) { return e.width;})
        .attr("stroke", "#fff")
        .attr("fill", "none")
    update_spacing()
}

function update_spacing()
{
    var th = trib.spacing * n;
    var hscale = d3.scale.linear()
        .domain([0, n])
        .range([0, sh])
    d3.selectAll("g.line path")
        .attr("transform", function(d, i) { 
            //return "translate(" + [0, th - spacing * d.index] + ")"; 
            return "translate(" + [0, 10+sh/2 + th / 2 - trib.spacing * d.index] + ")"; 
        })
}


var g = svg.append("g")
.attr("transform", "translate(" + [0, dy] + ")");

var line = g.selectAll("g.line")
    .data(lines)
  .enter().append("svg:g")
    .attr("class", "line")
    .each(lineenter);




/*
var opacity = d3.scale.linear()
    .domain([0, n])
    .range([1, .4])
*/
  
d3.selectAll("g.line path") 
    .attr("d", function(d,i) {
        return line_maker(d) 
    })
    .attr("stroke", function(d,i) { return color(d.index+n);})
    .attr("opacity", trib.opacity);