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210 lines
6.1 KiB
JavaScript
210 lines
6.1 KiB
JavaScript
// JS
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var $ = window.$ || require('jquery');
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var px = window.px || require('../javascripts/modules/caravel.js');
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var d3 = require('d3');
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d3.tip = require('d3-tip'); //using window.d3 doesn't capture events properly bc of multiple instances
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// CSS
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require('./heatmap.css');
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// Inspired from http://bl.ocks.org/mbostock/3074470
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// https://jsfiddle.net/cyril123/h0reyumq/
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function heatmapVis(slice) {
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var margins = {
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t: 10,
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r: 10,
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b: 50,
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l: 60
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};
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function refresh() {
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var width = slice.width();
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var height = slice.height();
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var hmWidth = width - (margins.l + margins.r);
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var hmHeight = height - (margins.b + margins.t);
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var fp = d3.format('.3p');
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d3.json(slice.jsonEndpoint(), function (error, payload) {
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var matrix = {};
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if (error) {
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slice.error(error.responseText);
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return '';
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}
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var fd = payload.form_data;
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var data = payload.data;
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function ordScale(k, rangeBands, reverse) {
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if (reverse === undefined) {
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reverse = false;
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}
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var domain = {};
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$.each(data, function (i, d) {
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domain[d[k]] = true;
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});
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domain = Object.keys(domain).sort(function (a, b) {
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return b - a;
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});
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if (reverse) {
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domain.reverse();
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}
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if (rangeBands === undefined) {
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return d3.scale.ordinal().domain(domain).range(d3.range(domain.length));
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} else {
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return d3.scale.ordinal().domain(domain).rangeBands(rangeBands);
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}
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}
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var xScale = ordScale('x');
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var yScale = ordScale('y', undefined, true);
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var xRbScale = ordScale('x', [0, hmWidth]);
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var yRbScale = ordScale('y', [hmHeight, 0]);
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var X = 0,
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Y = 1;
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var heatmapDim = [xRbScale.domain().length, yRbScale.domain().length];
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var color = px.color.colorScalerFactory(fd.linear_color_scheme);
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var scale = [
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d3.scale.linear()
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.domain([0, heatmapDim[X]])
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.range([0, hmWidth]),
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d3.scale.linear()
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.domain([0, heatmapDim[Y]])
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.range([0, hmHeight])
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];
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var container = d3.select(slice.selector)
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.style("left", "0px")
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.style("position", "relative")
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.style("top", "0px");
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var canvas = container.append("canvas")
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.attr("width", heatmapDim[X])
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.attr("height", heatmapDim[Y])
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.style("width", hmWidth + "px")
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.style("height", hmHeight + "px")
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.style("image-rendering", fd.canvas_image_rendering)
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.style("left", margins.l + "px")
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.style("top", margins.t + "px")
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.style("position", "absolute");
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var svg = container.append("svg")
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.attr("width", width)
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.attr("height", height)
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.style("left", "0px")
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.style("top", "0px")
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.style("position", "absolute");
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var rect = svg.append('g')
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.attr("transform", "translate(" + margins.l + "," + margins.t + ")")
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.append('rect')
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.style('fill-opacity', 0)
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.attr('stroke', 'black')
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.attr("width", hmWidth)
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.attr("height", hmHeight);
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var tip = d3.tip()
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.attr('class', 'd3-tip')
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.offset(function () {
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var k = d3.mouse(this);
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var x = k[0] - (hmWidth / 2);
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return [k[1] - 20, x];
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})
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.html(function (d) {
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var k = d3.mouse(this);
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var m = Math.floor(scale[0].invert(k[0]));
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var n = Math.floor(scale[1].invert(k[1]));
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if (m in matrix && n in matrix[m]) {
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var obj = matrix[m][n];
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var s = "";
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s += "<div><b>" + fd.all_columns_x + ": </b>" + obj.x + "<div>";
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s += "<div><b>" + fd.all_columns_y + ": </b>" + obj.y + "<div>";
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s += "<div><b>" + fd.metric + ": </b>" + obj.v + "<div>";
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s += "<div><b>%: </b>" + fp(obj.perc) + "<div>";
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return s;
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}
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});
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rect.call(tip);
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var xAxis = d3.svg.axis()
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.scale(xRbScale)
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.tickValues(xRbScale.domain().filter(
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function (d, i) {
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return !(i % (parseInt(fd.xscale_interval, 10)));
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}))
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.orient("bottom");
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var yAxis = d3.svg.axis()
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.scale(yRbScale)
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.tickValues(yRbScale.domain().filter(
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function (d, i) {
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return !(i % (parseInt(fd.yscale_interval, 10)));
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}))
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.orient("left");
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svg.append("g")
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.attr("class", "x axis")
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.attr("transform", "translate(" + margins.l + "," + (margins.t + hmHeight) + ")")
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.call(xAxis)
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.selectAll("text")
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.style("text-anchor", "end")
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.attr("transform", "rotate(-45)")
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.style("font-weight", "bold");
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svg.append("g")
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.attr("class", "y axis")
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.attr("transform", "translate(" + margins.l + ", 0)")
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.call(yAxis);
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rect.on('mousemove', tip.show);
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rect.on('mouseout', tip.hide);
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var context = canvas.node().getContext("2d");
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context.imageSmoothingEnabled = false;
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createImageObj();
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// Compute the pixel colors; scaled by CSS.
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function createImageObj() {
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var imageObj = new Image();
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var image = context.createImageData(heatmapDim[0], heatmapDim[1]);
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var pixs = {};
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$.each(data, function (i, d) {
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var c = d3.rgb(color(d.perc));
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var x = xScale(d.x);
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var y = yScale(d.y);
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pixs[x + (y * xScale.domain().length)] = c;
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if (matrix[x] === undefined) {
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matrix[x] = {};
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}
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if (matrix[x][y] === undefined) {
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matrix[x][y] = d;
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}
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});
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var p = -1;
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for (var i = 0; i < heatmapDim[0] * heatmapDim[1]; i++) {
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var c = pixs[i];
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var alpha = 255;
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if (c === undefined) {
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c = d3.rgb('#F00');
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alpha = 0;
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}
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image.data[++p] = c.r;
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image.data[++p] = c.g;
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image.data[++p] = c.b;
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image.data[++p] = alpha;
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}
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context.putImageData(image, 0, 0);
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imageObj.src = canvas.node().toDataURL();
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}
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slice.done();
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});
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}
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return {
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render: refresh,
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resize: refresh
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};
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}
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module.exports = heatmapVis;
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