d3.js - Mirror d3 graph horizontally in JavaScript/html -


i'm trying flip graph in js without changing axis. javascript isn't specialty , after googling 4 hours i'm starting think isn't possible. can point me in right direction please?

var width = 960,     height = 500;  d3.json("data2.json", function(error, heatmap) {   var dx = heatmap[0].length,       dy = heatmap.length;    // fix aspect ratio.   // var ka = dy / dx, kb = height / width;   // if (ka < kb) height = width * ka;   // else width = height / ka;    var x = d3.scale.linear()       .domain([0, dx])       .range([0, width]);    var y = d3.scale.linear()       .domain([0, dy])       .range([height, 0]);    var color = d3.scale.linear()       .domain([null, 0, 30, 60, 90, 120])       .range(["#ffffff", "#ff0000", "#ff9933", "#ffff00", "#99ff33", "#00ff00"]);    var xaxis = d3.svg.axis()       .scale(x)       .orient("top")       .ticks(20);    var yaxis = d3.svg.axis()       .scale(y)       .orient("right");    d3.select("body").append("canvas")       .attr("width", dx)       .attr("height", dy)       .style("width", width + "px")       .style("height", height + "px")       .call(drawimage);    var svg = d3.select("body").append("svg")       .attr("width", width)       .attr("height", height);    svg.append("g")       .attr("class", "x axis")       .attr("transform", "translate(0," + height + ")")       .call(xaxis)       .call(removezero);    svg.append("g")       .attr("class", "y axis")       .call(yaxis)       .call(removezero);     function drawimage(canvas) {     var context = canvas.node().getcontext("2d"),         image = context.createimagedata(dx, dy);            (var y = 0, p = -1; y < dy; ++y) {       (var x = 0; x < dx; ++x) {         var c = d3.rgb(color(heatmap[y][x]));         image.data[++p] = c.r;         image.data[++p] = c.g;         image.data[++p] = c.b;         image.data[++p] = 255;       }     }      context.putimagedata(image, 0, 0);   }    function removezero(axis) {     axis.selectall("g").filter(function(d) { return !d; }).remove();   }   });

i see you're not using d3 part of code makes image itself. in nested loops, when you're manually producing bitmap image, can traverse data in reverse. instead of indexing row heatmap[y] directly on x, should index on dx - x - 1, column number counting right.

jsfiddle

as aside, seems little strange mixing svg , canvas drawing techniques here. depending on how data you're showing, may valuable draw heatmap svg well, allow use single api draw chart , enable interactions well. alternatively, go drawing whole thing on canvas, if static image more appropriate, instance if scale of data massive.


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