d3.js Y axis doesn't extend to value - d3.js

I have a barchart which is populated by values from a JSON variable. The chart is dynamic because the values are retrieved from an SQL query by doing a count. So my data gets fed back in like :
[{"Fruit":"Apple","COUNT( Fruit )":"12"},{"Fruit":"Orange","COUNT( Fruit )":"6"},{"Fruit":"Pear","COUNT( Fruit )":"1"},{"Fruit":"Blank","COUNT( Fruit )":"1"},{"Fruit":"Pineapple","COUNT( Fruit )":"1"},{"Fruit":"Kiwi","COUNT( Fruit )":"1"}]
For the most part my graphs seem to be displaying properly. However some are returning values that exceed the Y Axis, I dont think it's the values that are causing the issues I believe its the axis that isnt calculating the right height. For instance
If Orange count is 14, sometimes the Y axis stops at a number less than this and that column extends the graph.
By viewing it in google chrome developer console, I can see the height of the bar is
<rect id="Orange" y="-520px" x="94px" height="1040px" width="162"></rect>
which far extends my SVG height of 600px - Margins(top + bottom) of 80px!
Does anyone know why my Y Axis isn't getting the right Max value?
Code here:
var canv = document.getElementById("exportCanvas");
canv.width = screen.width;
var margin ={top:40, right:0, bottom:40, left:40},
width=screen.width - 250,
height=600-margin.top-margin.bottom;
var jsplit = jdata.split('"');
var keyX = jsplit[1];
var keyY = "";
var data = JSON.parse(jdata);
for (k in data[0]) {
if (k!=keyX) keyY=k;
}
console.log("keyX = " + keyX);
console.log(keyY);
console.log(data[0]);
// scale to ordinal because x axis is not numerical
var x = d3.scale.ordinal()
.domain(['Orange','Apple','Pear']) //Added this in temporarilly. this should be calculated from the data.
.rangeRoundBands([0, width], 0.25,0.25);
//scale to numerical value by height
// var y = d3.scale.linear().range([height, 0]);
var y = d3.scale.linear()
.range([height, 0]);
console.log(data);
x.domain(data.map(function(d){ return d[keyX]}));
y.domain([0, d3.max(data, function(d){return d[keyY]})]);
var chart = d3.select("#chart")
.append("svg") //append svg element inside #chart
.attr("width", width+ margin.left+margin.right) //set width
// .attr("width", width+(2*margin.left)+margin.right) //set width
.attr("height", height+margin.top+margin.bottom); //set height
// .attr("transform", "translate(" + Math.min(width,height) / 2 + "," + Math.min(width,height) / 2 + ")");
var xAxis = d3.svg.axis()
.scale(x)
.orient("bottom"); //orient bottom because x-axis will appear below the bars
var yAxis = d3.svg.axis()
.scale(y)
.orient("left")
.ticks(10).tickFormat(function(d) {
if (d % 1 == 0) {
return d3.format('.f')(d)
} else {
return ""
}
});
var bar = chart.selectAll("g")
.data(data)
.enter()
.append("g");
//you're moving the group and then moving the rect below as well
//one or the other not both need to be moved.
//.attr("transform", function(d, i){
// return "translate("+x(d[keyX])+", 0)";
//});
bar.append("rect")
.attr("id", function(d) {
return d[keyX];
})
.attr("y", function(d) {
return y(d[keyY]) + "px";
})
.attr("x", function(d,i){
//AB - Adjusted this so it correcly places the bar along the X
//x.range is an array of x values for each bar
//calculated in the var x = line above , with the .rangeRoundBands([0, width], 0.25,0.25);
//setting the width of the bars (an equal division of width) with margins of 0.25 at the start
//and end of the graph and 0.25 between each bar.
return x.range()[i] + margin.left + "px";
})
.attr("height", function(d) {
return height - y(d[keyY]) +"px";
})
.attr("width", x.rangeBand()); //set width base on range on ordinal data
bar.append("text")
.attr("x",function(d,i){
//similar to above but adding half the width of the bar to the x position
//to roughly center it on the bar. only rough as doesnt take account of length of text.
return x.range()[i] + margin.left + (x.rangeBand()/2)+ "px";
})
.attr("y", function(d) { return y(d[keyY]) +20; })
.attr("dy", ".75em")
.style("fill","white")
.style("font-weight", "bold")
.text(function(d) { return d[keyY]; });
chart.append("g")
.attr("class", "x axis")
.attr("transform", "translate("+margin.left+","+ height+")")
.call(xAxis);
chart.append("g")
.attr("class", "y axis")
.attr("transform", "translate("+margin.left+",0)")
.call(yAxis)
.append("text")
.attr("transform", "rotate(-90)")
.attr("y", 6)
.attr("dy", ".71em")
.style("text-anchor", "end")
.text(keyY);
Apologies for commented out code, I have been playing with it alot to try and suss this out.

You need to recalculate y.domain() when your dataset refreshes. So when you update your data, you can try something like:
y.domain([0, d3.max(data, function(d){return d[keyY]})]);
chart.select(".y.axis")
.call(yAxis.scale(y));

Related

d3.js lines not showing for part of filtered then nested data (added plot images)

I have a data that is filtered by year then nested by group. The first few years there is one group, while the remaining years have seven to eight groups for which the lines are plotted. Along with lines I also plot points of actual data.
here is the plot for the year 2007 that has only one group:
2007 line plot
Notice the y-axis is missing and only the points are showing but no lines.
Here is the plot for the year 2010 that has eight groups:
2010 lines plot
Notice the y-axis, all points and lines are showing.
Here is the associated code:
Defining line
var line = d3.svg.line()
.x(function(d) { return LoanAmount_scale(d['amount_mean']); })
.y(function(d) { return Investor_scale(d['Investors_mean']); });
var svg = d3.select("body")
.append("svg")
.attr("width", width + margin.left + margin.right )
.attr("height", height + margin.top + margin.bottom);
var plot = svg.append("g")
.attr("class", "chart")
.attr("width" , width- margin.left)
.attr("height", height)
.attr("transform","translate ("+ margin.left + "," + margin.top + ")");
menu selection
// setting stage for dropdown menu
// years
var years = ['Select Year'];
var i= 2006;
for( i = 2006; i<= 2014; i++){
years.push(i);
}
// selecting an option
var select = d3.select('body')
.append('select')
.attr('class','select')
.attr('id','select_id')
.on('change',change);
// available options on dropdown menu
var option = select.selectAll('option')
.data(years)
.enter()
.append('option')
.text(function(d){ return d});
// menu selection of year
function change(){
var select_year = d3.select('select')
.property('value')
// reset chart before updating year
update(data,'Select Year');
// update year
update(data,select_year);
}
Update function filters year and nests by group, then plots lines and points
function update(data, year){
var Filtered = data.filter(function(d){ return d["LoanOrig_Yr"] == year});
var nested_by_rating = d3.nest()
.key(function(d) {
return d['ProsperRating']
}).sortKeys(d3.ascending)
.entries(Filtered);
// add lines for each rating
var lines = plot.selectAll("path")
.data(nested_by_rating)
// remove old lines
lines.exit().remove();
plot.selectAll("circle")
.data(nested_by_rating)
.exit().remove();
nested_by_rating.forEach( function(d,i){
var prosperR = d.key
// entering data
lines.enter()
.append("path")
.attr("class", "line")
.attr("d", line(d.values))
.attr("stroke", RatingColor(prosperR))
.attr("stroke-width", 3)
.attr("stroke-opacity",0.3)
.attr("fill","none");
debugger;
plot.selectAll("path.dot")
.data(d.values)
.enter().append("circle")
.attr("class", "dot")
.attr("cx", line.x())
.attr("cy", line.y())
.attr("r", 3.5)
.attr("fill","Black");
debugger;
// dynamic legend
svg.append("text")
.attr("x", 1300)
.attr("y", 100 + i*20)
.attr("class", "legend") // style the legend
.style("fill", function() { // Add the colours dynamically
return d.color = RatingColor(prosperR); })
.text(prosperR);
Reset chart between year selection
// reseting chart between years
if (year == 'Select Year'){
gX.call(xAxis);
gY.call(yAxis);
svg.append("text")
.attr("x", 1300)
.attr("y", 100)
.attr("class", "legend") // style the legend
.style("fill", "white")
.text(["NR"]);
svg.selectAll("legend_text")
.data(["1.AA","2.A","3.B","4.C","5.D","6.E","7.HR","NR"])
.enter()
.append("text")
.attr("class","legend")
.attr("x", 1300)
.attr("y", function(d,i){return 100 + i*20;
})
.attr("class", "legend") // style the legend
.style("fill", "white")
.style("stroke","white")
.text(function(d,i){return d;});
} \\ end if statement
} \\end .forEach statement
When tracking data entry and exit using the browser inspector, I find the data in both cases move in and out as expected. Observe the points data are passed using line.x() and line.y(), so it is very strange that the line does not show in the year 2007 and other similar years with one group.
I would appreciate any help fixing this bug. Thank you.
You delete the lines by selecting all paths, and the axis line is a path.
Also the update of the legend was adding each time a lot of entries.
Black legend text is hidden/shown by setting fill to white or black.
The axis do not need update drawing for the Select Year, they stay the same for all graphs.
var data = d3.csv.parse(d3.select("#dataset").text());
data.forEach(function(d){
d.LoanOrig_Yr = parseInt(+d.LoanOrig_Yr);
d.amount_median = parseFloat(+d.amount_median);
d.Investors_median = parseInt(+d.Investors_median);
});
function draw(data) {
var margin = {top: 5, right: 100, bottom: 150, left: 80},
width = 1460 - margin.left - margin.right,
height = 600 - margin.top - margin.bottom;
var margin2 = {top: 430, right: 200, bottom: 110, left:80},
height2 = 600 - margin2.top - margin2.bottom;
var margin3 = {top: 40, right:20, bottom: 80, left:180},
width2 = 1300 - margin3.left - margin3.right;
// display title
d3.select("body")
.append("h2")
.text("Funding low risk loans is shared by more investors than high risk loans");
// guiding text
d3.select("body")
.append("p")
.text("An investor may fund the whole loan or fractions of several loans with minimum"+
" investment amount of $25."+
" Prosper rating started in July 2009." +
" Prosper Rating (ordered): AA (lowest risk), A, B, C, D, E, HR (high risk), NR (not rated)." +
" Points on the line reflect loan amount average computed by "+
" agregating loans over brackets of size $1500, starting at $1000." +
" Data for 2014 is only for the first quarter."
);
var Investor_extent = d3.extent(data, function(d){
return d.Investors_median;
});
var Investor_scale = d3.scale.linear()
.domain(Investor_extent)
.range([height,margin.top]);
var LoanAmount_extent = d3.extent(data, function(d){
return d.amount_median;
});
var LoanAmount_scale = d3.scale.linear()
.range([margin.left, width])
.domain(LoanAmount_extent);
var ProsperRating = ["1.AA","2.A","3.B","4.C","5.D","6.E","7.HR","NR"];
var colors = ['Brown','Red','Orange','Yellow','Green','Blue','Purple','Gray'];
var RatingColor = d3.scale.ordinal()
.domain(ProsperRating)
.range(colors);
var xAxis = d3.svg.axis()
.scale(LoanAmount_scale)
.orient("bottom")
.ticks(12);
var yAxis = d3.svg.axis()
.scale(Investor_scale)
.orient("left")
.ticks(10);
var line = d3.svg.line()
.x(function(d) { return LoanAmount_scale(d.amount_median); })
.y(function(d) { return Investor_scale(d.Investors_median); });
var svg = d3.select("body")
.append("svg")
.attr("width", width + margin.left + margin.right )
.attr("height", height + margin.top + margin.bottom);
var plot = svg.append("g")
.attr("class", "chart")
.attr("width" , width- margin.left)
.attr("height", height)
.attr("transform","translate ("+ margin.left + "," + margin.top + ")");
var div = d3.select("body")
.append("div")
.attr("class","tooltip")
.style("opacity",0);
// setting stage for dropdown menu
// years
var years = ['Select Year', 2007, 2010];
// selecting an option
var select = d3.select('body')
.append('select')
.attr('class','select')
.attr('id','select_id')
.on('change',change);
// available options on dropdown menu
var option = select.selectAll('option')
.data(years)
.enter()
.append('option')
.text(function(d){ return d});
// menu selection of year
function change(){
var select_year = d3.select('select')
.property('value')
// reset chart before updating year
update(data,'Select Year');
// update year
update(data,select_year);
}
// add x axis
var gX = plot.append("g")
.attr("class","x axis")
.attr("transform","translate (0 " + height + ")")
.call(xAxis);
// add y axis
var gY = plot.append("g")
.attr("class", "y axis")
.attr("transform" , "translate( " + margin.left + " ,0)")
.call(yAxis);
//add x axis label
plot.append("text")
.attr("class", "x label")
.attr("text-anchor", "middle")
.attr("x", width/2 )
.attr("y", height + 40)
.text("Loan Amount median (US dollars)");
//add y axis label
plot.append("text")
.attr("class", "y label")
.attr("text-anchor", "middle")
.attr("x",0-(height/2))
.attr("y", 20)
.attr("dy", "1em")
.attr("transform", "rotate(-90)")
.text("Median number of investors who share funding one loan");
// legend title
svg.append("text")
.attr("x",1300)
.attr("y",70)
.attr("class","legend_title")
.style("fill","white")
.text("Legend: Prosper Rating");
svg.append("text")
.attr("x",1300)
.attr("y",30)
.attr("class","legend_title")
.style("fill","white")
.text("point mouse at line to determine rating");
function update(data, year){
var Filtered = data.filter(function(d){ return d.LoanOrig_Yr == year});
var nested_by_rating = d3.nest()
.key(function(d) { return d.ProsperRating })
.sortKeys(d3.ascending)
.entries(Filtered);
// add lines for each rating
var lines = plot.selectAll(".line")
.data(nested_by_rating)
// remove old lines
lines.exit().remove();
plot.selectAll("circle")
.data(nested_by_rating)
.exit().remove();
nested_by_rating.forEach( function(d,i){
var prosperR = d.key;
// entering data
lines.enter()
.append("path")
.attr("class", "line")
.attr("d", line(d.values))
.attr("stroke", RatingColor(prosperR))
.attr("stroke-width", 3)
.attr("stroke-opacity",0.3)
.attr("fill","none");
plot.selectAll("path.dot")
.data(d.values)
.enter().append("circle")
.attr("class", "dot")
.attr("cx", line.x())
.attr("cy", line.y())
.attr("r", 3.5)
.attr("fill","Black");
// dynamic legend
svg.append("text")
.attr("x", 1300)
.attr("y", 100 + i*20)
.attr("class", "legend") // style the legend
.style("fill", function() { return RatingColor(prosperR); }) // Add the colours dynamically
.text(prosperR);
// mouse hover tip tool
lines.on("mouseover", function(d){
div.transition()
.duration(200)
.style("opacity", 0.9);
div.html("Prosper Rating : " + prosperR)
.style("left", (d3.event.pageX) + "px")
style("top", (d3.event.pageY - 2) + "px");
})
.on("mouseout", function(d) {
div.transition()
.duration(500)
.style("opacity", 0);
})
});
// reseting chart between years
if (year == 'Select Year'){
svg.selectAll(".legend_title").style("fill","white");
svg.selectAll(".legend").remove();
} else {
svg.selectAll(".legend_title").style("fill","black");
}
}
}
draw(data);

Horizontal gradient in a bar chart

I have a bar chart.
function svg_render(data, svg) {
var node = d3.select(svg).append("svg")
.attr("class", "chart")
.attr("width", width)
.attr("height", height);
var y = d3.scale.linear().range([height, -height]);
var max_val = d3.max(data, function(d) {
return d;
});
y.domain([-max_val, max_val]);
var x = d3.scale.linear().domain([0, data.length]);
var bar_width = width / data.length;
var chart = node.attr("width", width).attr("height", height);
var bar = chart.selectAll("g")
.data(data)
.enter().append("g") // svg "group"
.attr("transform", function(d, i) {
return "translate(" + i * bar_width + ",0)";
});
bar.append("rect")
.attr("y", function(d) {
var yv = height - Math.abs(y(d) / 2) - height / 2 + 2;
return yv;
})
.attr("height", function(d) {
return Math.abs(y(d));
})
.attr("width", bar_width);
var axis = d3.svg.axis()
.scale(y)
.ticks(12)
.orient("left");
d3.select(".svg").append("svg")
.attr("class", "axis")
.attr("width", 60)
.attr("height", height)
.append("g")
.attr("transform", "translate(40," + (height / 2) + ")")
.call(axis);
}
would be great to be able to have a gradient towards the chart. An horizontal one.
Something like
Each bar can have a specific rgb code, but would be better if it was all calculated with a single gradient.
Also, bonus question, why i have that white lines as a border of my bars if i actually didn't specify any border at all (feels like aliasing svg issue)
So, i managed to achieve that by doing
var color = d3.scale.linear()
.domain([0, width])
.range(["hsl(62,100%,90%)", "hsl(222,30%,20%)"]);
And later on, for each bar element append
.style("fill", function(d, i) {
return color(i);
});
wonder if it's the fast way to do this

d3 line chart using path is not showing anything

I am trying to draw a path that means line chart using d3.js. I am using the following code
var data;
d3.csv("myfile.csv",function(datagot){data=datagot;});
var format = d3.time.format("%Y/%m/%d %H:%M:%S");
data.forEach(function (e){
e.dist = +e.dist;
e.speed = +e.speed;
e.lat=+e.lat;
e.lon=+e.lon;
e.dd=format.parse(e.time);
});
var xScale = d3.time.scale().range([margin.left, width - margin.right]).domain([d3.min(dataset,function(d){return d.dd}),d3.max(dataset,function(d){ return d.dd})]),
yScale = d3.scale.linear().range([height - margin.top, margin.bottom]).domain([d3.min(dataset,function(d){return d.dist;}),d3.max(dataset,function(d){return d.dist;})]),
xAxis = d3.svg.axis()
.scale(xScale).ticks(10).tickFormat(d3.time.format("%H:%M")).tickPadding(2),
yAxis = d3.svg.axis()
.scale(yScale).orient("left").tickPadding(5).ticks(5);
var svg = d3.select("body").append("svg")
.attr("width", width-50 )
.attr("height", height -60);
svg.append("svg:g")
.attr("class","axis")
.attr("transform", "translate(0," + (height - margin.bottom) + ")")
.call(xAxis);
// x axis label
svg.append("text")
.attr("x", width / 2 )
.attr("y", height - 60)
.style("text-anchor", "middle")
.text("Time");
svg.append("svg:g")
.attr("class","axis")
.attr("transform", "translate(" + (margin.left-10) + ",-90)")
.call(yAxis);
// Y axis label
svg.append("text")
.attr("transform", "rotate(-90)")
.attr("y", 15)
.attr("x",70- (height / 2))
.attr("dy", "1em")
.style("text-anchor", "middle")
.text("Distance");
// svg.append("g")
//.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var x = d3.scale.linear()
.range([0, width]);
var y = d3.scale.linear()
.range([height, 0]);
lineh = d3.svg.line().x(function(d) {
return x(d.dd);
}).y(function(d) {
return y(d.dist);
});
var line = svg.append("g").attr("transform", "translate(" + margin.left + "," + (-margin.top) + ")").selectAll(".hour")
.data(outputf)
.enter().append("path")
//.attr("x", function(d) { return (d.dd.getMinutes())*15 ; })
// .attr("cx", function(d) { return (d.dd.getMinutes())*10 ; })
//.attr("y", function(d) { return (d.dist)*50 ; })
// .attr("cy", function(d) { return height-100-(d.dist)*50 ; })
//.attr("r",3)
/* .attr("rx", 2)
.attr("ry", 2)*/
.attr("d",lineh)
.attr("class", "line");
But its actually not plotting anything. I am giving the jsfiddle for your help to understand. http://jsfiddle.net/1b0gn0r2/. The jsfiddle is not well organized but it contains my code and the csv data I am using is at the bottom. Can anyone help me to find the error?
In my actual code the output is the following
There's a lot that seems to be wrong in your code! Having various things missing (like margin, height, width, other variables, the CSS etc), makes it very painful to answer your question.
To start with, if you're struggling with jsfiddle you may prefer Plunker, which makes it easier to organise your code and data.
I've created a plunk that works with your code here: http://plnkr.co/edit/ZEi7U6qQ8pxq06FdDIW6?p=preview
...but it involved quite a few changes, which I'll try to summarise:
Loading is asynchronous, so this line:
d3.csv("myfile.csv",function(datagot){data=datagot;});
will not do what you expect. The rest of the code will go off and execute (eg drawing axes) without data having been properly set. So you try to draw the line before the data is ready. Fix this by inserting the main code into the data load function.
Defining scales. You seem to define 4 different scales:
xScale = d3.time.scale()
yScale = d3.scale.linear()
x = d3.scale.linear()
y = d3.scale.linear()
That causes problems later in your line drawing function (more to come on that). I've got rid of x and y here
The line drawing function lineh expects the scales to be x and y, but I suggest using the xScale and yScale ones you've defined before.
// line function
lineh = d3.svg.line()
.x(function(d) {
return xScale(d.dd); // <- do not use d(d.dd)
})...
Calling the line function should be done in a completely different way: Your code:
var line = svg.append("g")
.data(outputf)
.enter().append("path")
.attr("d",lineh)
.attr("class", "line");
Not sure what outputf is so I ignored that. lineh (defines how to draw the line) should be called with the data. I changed the call to:
var line = svg.append("g")
.append("path")
.attr("d", lineh(dataset)) // <- Note the change
.attr("class", "line");
Finally I reorganised the code to bring some variable definitions to the top of the file and make it easier to follow.

Reading tsv file with a filter

I am trying to plot a simple bar graph from a tsv file and would appreciate some help.
First of all, here is a sample input file:
ind count
0 1228
1 0
2 238
3 9
I need to plot number of records (y-axis) vs. "count" (x-axis).
The user has the option via the HTML page to decide at what "count" value to
suppress the data. For example, suppress all records where count=0. Changing the number of records and with that the range of data affects the scales of both axes.
I have no problem getting all the data and setting up the scales for the axes. I do that as the first step right after reading in the data from the file (d3.tsv...). But how do I do that when I only want to use partial data of the input file? I use
d3.max(data, function(d){ return +d.indx}
to get the number of records in my input file.
I did play with the filter() method a bit but (besides being unsuccessful so far) I still think that the right place to filter data out would be right away - when reading the input file.
Chances are this is so obvious that the answer will make me blush but
my brain has given up. With that, thank you for responding!
And now, here is some of my code:
function drawBarGraph( minCountNum){
d3.tsv("../../data/test.tsv", function( error, data){ //get the number of rows and the largest number of the "total" column for scaling purposes
//y-axis: use number of lines in input file
var bar_num = d3.max(data, function(d) { return +d.indx;} ); //use plus sign (+) in front of a variable to ensure conversion to a numeric value.
//x-axis: use largest value of "total reads" from input file;
var data_max = d3.max(data, function(d) { return +d.total;} );
//set up canvas size
var margin = { top: 30, right: 20, bottom: 40, left: 50},
width = 800 - margin.left - margin.right,
height = 2 * bar_num + 2; //each bar is 1px high and spaced by 1px; add 2px to the bottom to allow a little space between the xAxis and the first data point
var bar_height = 1; //yes, draw the bars 1px high
//set up the x and y scales
var xScale = d3.scale.linear()
.domain([0, data_max]) //define original range with min and max
.range([0, width]); //define what resulting range should be
var yScale = d3.scale.linear()
.domain([0, bar_num*2])
.range([0, height]);
//set up the x and y axes
var xAxis = d3.svg.axis()
.scale( xScale)
.orient("bottom")
//.ticks( 5); //let d3 decide on the number of ticks used or calculate based on longest x-value
var yAxis = d3.svg.axis()
.scale( yScale)
.orient("left")
.ticks( 0); //no ticks or make them the index or node id's
var canvas = d3.select("body")
.append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var div = d3.select("body").append("div")
.attr("class", "tooltip") //add the CSS tooltip
.style("opacity", 0);
canvas.selectAll("rect")
.data(data)
.enter()
//.filter(function(d) { return +d.total > 0; }) //this returns 'undefined'
.append("svg:a")
.attr("xlink:show", "new")
.attr("xlink:href", function(d){return ncbi_url + d.taxon_id;})
.append("rect")
.attr("width", function(d) { return xScale(d.total);})
.attr("height", bar_height)
.attr("y", function(d,i){ return i * (bar_height + 1);})
.attr("fill", function(d) { return d.color;})
.on("mouseover", function(d){
div.transition()
.duration(200)
.style("opacity", .9);
div.html(
"Node ID: " + d.id + "<br/>Tot. Reads: " + d.total)
.style("left", (d3.event.pageX) + "px")
.style("top", (d3.event.pageY - 28) + "px");
})
.on("mouseout", function(d){
div.transition()
.duration(500)
.style("opacity", 0);
});
canvas.append("g")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
canvas.append("text") //add the x-axis label
.attr("x", (width / 2))
.attr("y", height + margin.bottom)
.style("text-anchor", "middle")
.text("Total Reads");
canvas.append("g")
.call(yAxis);
canvas.append("text") //add the y-axis label
.attr("transform", "rotate(-90)")
.attr("y", 0 - margin.left + 20)
.attr("x", 0 - (height / 2))
.attr("dy", "1em")
.style("text-anchor", "middle")
.text("Node #");
canvas.append("text") //add a title
.attr("x", (width / 2))
.attr("y", 0 - (margin.top / 2))
.attr("text-anchor", "middle")
.style("font-size", "20px")
.style("text-decoration", "underline")
.text("Node Plot");
})
}
Yes, the best way to do this would be right after getting the data to make sure that all subsequent operations consider only the subset that you want. You can use the .filter() function for this.
var threshold = ...;
var newdata = data.filter(function(d) { return +d.total > threshold; });
(I've taken total as the field to filter on like in the code you've posted).

Maximum width for column in bar chart

I'm looking for a way of limiting the column width in a chart, I'm sure this ought to be relatively easy but I cant find a way of doing it.
I'm populating a chart from some dynamic data, where the number of columns can vary quite dramatically - between 1 and 20.
e.g: sample of csv
Location,Col1
"Your house",20
Location,Col1,Col2,Col3,Col4,Col5
"My House",12,5,23,1,5
This is working fine, and the col widths are dynamic, however when there is only one column in the data, I end up with one bar of width 756 (the whole chart), and I dont like the way this looks.
What I'd like to do is only ever have a maximum column of width 100px irrespective of the number of columns of data.
Below is my script for the chart
Many thanks,
<script>
var margin = {
top : 40,
right : 80,
bottom : 80,
left : 40
},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
var x = d3.scale.linear().range([ 0, width ]);
var y = d3.scale.linear().range([ height, 0 ]);
var x0 = d3.scale.ordinal()
.rangeRoundBands([0, width], .05);
var x1 = d3.scale.ordinal();
var y = d3.scale.linear()
.range([height, 0]);
var chart = d3.select("body").append("svg")
.attr("class","chart")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var legendChart = d3.select("body").append("svg")
.attr("class","chart")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
d3.csv("/sampledata.csv.txt", function(error, data) {
// Use the first row of csv for header names
var reasonNames = d3.keys(data[0]).filter(function(key) {
return key !== "Location";
});
//console.log(reasonNames);
data.forEach(function(d) {
d.reasons = reasonNames.map(function(name) {
return {
name : name,
value : +d[name]
};
});
//console.log(d.reasons);
});
x0.domain(data.map(function(d) {return d.Location; }));
x1.domain(reasonNames).rangeRoundBands([0, x0.rangeBand()]);
console.log(x0.rangeBand());
y.domain([0, d3.max(data, function(d) { return d3.max(d.reasons, function(d) { return d.value; }); })]);
var maxVal = d3.max(data, function(d) { return d3.max(d.reasons, function(d) { return d.value; }); });
//console.log(maxVal);
var xAxis = d3.svg.axis()
.scale(x0)
.orient("bottom");
var yAxis = d3.svg.axis()
.scale(y)
.orient("left")
//.tickFormat(d3.format(".2s"));
chart.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
chart.append("g")
.attr("class", "y axis")
.call(yAxis);
var location = chart.selectAll(".name")
.data(data)
.enter().append("g")
.attr("class", "g")
.attr("transform", function(d) { return "translate(" + x0(d.Location) + ",0)"; });
location.selectAll("rect")
.data(function(d) { return d.reasons; })
.enter().append("rect")
.attr("width", x1.rangeBand()-2)
.attr("x", function(d) { return x1(d.name); })
.attr("y", function(d) { return y(d.value); })
.attr("height", function(d) { return height - y(d.value); })
.style("fill", function(d,i) { return "#"+3+"9"+i; /*color(d.name);*/ });
chart.selectAll("text")
.data(data)
.enter().append("text")
.attr("x", function(d) { return x1(d.name)+ x.rangeBand() / 2; })
.attr("y", function(d) { return y(d.value); })
.attr("dx", -3) // padding-right
.attr("dy", ".35em") // vertical-align: middle
.attr("text-anchor", "end") // text-align: right
.text("String");
var legend = legendChart.selectAll(".legend")
.data(reasonNames.slice().reverse())
.enter()
.append("g")
.attr("class", "legend")
.attr("transform", function(d, i) { return "translate(0," + i * 20 + ")";
});
legend.append("rect")
//.attr("x", width - 18)
.attr("x", 18)
.attr("width", 18)
.attr("height", 18)
.style("fill", function(d, i) {/*console.log(i);*/return "#" + 3 + "9" + i;
});
legend.append("text")
//.attr("x", width - 24)
.attr("x", 48)
.attr("y", 9).attr("dy",".35em")
//.style("text-anchor", "end")
//.text(function(d,i) { return String.fromCharCode((65+i))+i; });
.text(function(d) { return d; });
});
</script>
The easiest way to achieve this is by changing the line
.attr("width", x1.rangeBand()-2)
to
.attr("width", Math.min(x1.rangeBand()-2, 100))
You might also want to adjust the starting position and/or padding.
Code for adjusting starting position if anyone is stuck on it:
.attr("x", function(d, i) { return x1(d.seriesName) + (x1.rangeBand() - 100)/2 ;})
P.S. : referring answer from Lars.
Setting an absolute maximum width for the columns doesn't allow proper rendering for different screen resolutions, div sizes, etc.
In my case, I just wanted the columns not to look so large when the number of columns itself is small
I found it easier and more straight-forward to play with the scale definition, by changing the maximum width (where all columns will fit), their inner and outer paddings.
var w = 600
// var w = parseInt(d3.select(parentID).style('width'), 10) // retrieve the div width dynamically
var inner_padding = 0.1
var outer_padding = 0.8
var xScale = d3.scale.ordinal().rangeRoundBands([0, w], inner_padding, outer_padding)
When rendering the plot, I just ran a switch/if-else statement, which assigns different padding values. The lower the number of columns to plot, the greater the outer_padding (and eventually inner-padding) values I use.
This way, I keep the plots responsive.
I am able to change the width of the bar using the above answer. But unfortunately, my X Axis labels are not aligned when there is a single bar in the chart and it uses the max width set.
var tradeGroup = svg.selectAll("g.trade")
.data(trades)
.enter()
.append("svg:g")
.attr("class", "trade")
.style("fill", function (d, i) {
return self.color(self.color.domain()[i]);
})
.style("stroke", function (d, i) {
return d3.rgb(self.color(self.color.domain()[i])).darker();
});
var aWidth = Math.min.apply(null, [x.rangeBand(), 100]);
// Add a rect for each date.
var rect = tradeGroup.selectAll("rect")
.data(Object)
.enter()
.append("svg:rect")
.attr("x", function (d) {
return x(d.x);
})
.attr("y", function (d) { return y( (d.y || 0) + (d.y0 || 0)); })
.attr("height", function (d) { return y(d.y0 || 0) - y((d.y || 0) + (d.y0 || 0)); })
.attr("width", Math.min.apply(null, [x.rangeBand(), 100]));
For completeness the full answer would look like this:
svg.selectAll(".bar")
.data(data)
.enter().append("rect")
.attr("class", "bar")
.attr("x", (d) -> x1(d.name) + (x1.rangeBand() - d3.min([x1.rangeBand(), 100]))/2)
.attr("width", d3.min([x1.rangeBand(), 100]))
.attr("y", (d) -> y(d.grade) )
.attr("height", (d)-> height - y(d.value) )
(coffeescript syntax)
Note this include the full answer, the 'width' and the 'x' settings. Also 'x' settings is accounting for a when 100 width is not the min value.
Thought I'd share that I came up with a slightly different answer to this. I didn't want to hard code in a maximum bar width because 1) it wasn't responsive to different screen sizes and 2) it also required playing with the x-coordinate attribute or accepting some irregular spacing.
Instead, I just set a minimum number of bars, based on the point where the bars became too wide (in my case, I found that less than 12 bars made my chart look weird). I then adjusted the scaleBand's range attribute, proportionately, if there were less than that number of bars. So, for example, if the minimum was set to 12 and there were only 5 items in the data, rather than rendering each of them at 1/5th of the full width, I scaled the range down to 5/12ths of the original width.
Basically, something like this:
// x is a scaleBand() that was previously defined, and this would run on update
var minBarSlots = 12;
if (data.length < minBarSlots) {
x.range([0, width*(data.length/minBarSlots)])
}
else {
x.range([0, width])
}`

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