Issue with leaflet.js "viewreset" map not zooming out properly - d3.js

I am new to Leaflet.js. I am trying add a layer to an OSM using Leaflet and D3. I can see one dot but when I zoom out to see if other dots are showing the map is does not redraw properly and I'm getting a "TypeError: t is undefined" message as well.
Here is bulk of my code:
/* We simply pick up the SVG from the map object */
var svg = d3.select("#map").select("svg"),
g = svg.append("g");
d3.tsv("DH_Doig.tsv", function(data) {
/* Add a LatLng object to each item in the dataset */
data.forEach(function(d) {
if (d.SoundLat && d.SoundLong) {
d.SoundLat = +d.SoundLat;
d.SoundLong = +d.SoundLong;
d.SoundLatLong = new L.LatLng(d.SoundLat, d.SoundLong);
//d.LatLng = new L.LatLng(d.circle.coordinates[0],
//d.circle.coordinates[1])
//console.log(d.SoundLatLong)
}
//console.log(d.SoundLatLong);
})
var feature = g.selectAll("circle")
.data(data)
.enter().append("circle")
.style("stroke", "black")
.style("opacity", .6)
.style("fill", "red")
.attr("r", 20);
map.on("viewreset", update);
update();
function update() {
feature.attr("transform",
function(d) {
console.log(d.SoundLatLong); //added to see lat long
return "translate("+
map.latLngToLayerPoint(d.SoundLatLong).x +","+
map.latLngToLayerPoint(d.SoundLatLong).y +")";
}
)
}
})
The typeError message has is referencing this line:
map.latLngToLayerPoint(d.SoundLatLong).x +","+
I am using this example as a basis: Map using leaflet.js and d3 combined.
Here is the plunk of my code.

The issue was that I had some null rows in my tsv, I thought the if (d.SoundLat && d.SoundLong) had caught the nulls but apparently not.

Related

Making a simple table Using D3 in meteor

I am testing d3.js in meteor.
While trying to make a simple table for test,I met a trouble.
Here is my codes
<template name="ob">
<h4>Table test- {{name}}</h4>
<svg id="obTable"><table><tr></tr></table></svg>
</template>
And below is javascript file for template above...
Template.ob.onRendered(function() {
//Width and height
var w = 600;
var h = 350;
//Define key function, to be used when binding data
var key = function (d) {
return d.index;
};
//Create SVG element
var svg = d3.select("#obTable")
.attr("width", w)
.attr("height", h);
var dataset = require('../data/ob.json');
// var dataset = Bars.find({}).fetch();
//Select…
var table = svg.selectAll('table').append('table')
.style("border-collapse", "collapse")
.style("border", "2px black solid");
// .data(dataset, key);
console.log(table);
var rows = table.selectAll('tr')
.data(dataset, key)
.enter()
.append('tr');
console.log(rows);
rows.selectAll('td')
.data(function(d){ console.log(d); return d;} )
.enter()
.append('td')
.text(function(d) {console.log("here"); return d;})
.style("border", "1px black solid")
.style("padding", "10px")
.style("font-size","12px");
});
I've got no errors from those code above, but when I execute my app, I could not see any table or table contents. ( since I can see in contents well, I am sure there is no problem on showing template itself)
Things that I can't most understand is that I can see log messages from rows.selectAll('td').data(function(d){ console.log(d); return d;} ) well, but I can't see any log from .text(function(d) {console.log("here"); return d;})
I doubt this could be a reason for not showing table, but could not solve further.
I installed d3 from npm and it's version is 4.10.0
Any advice would be greatly appreciated.
I had this problem as well. Issue is that the dom is getting rewritten due to reactive updates, and your on render select is getting destroyed.
How I solved this was to do a template helper at the end of the template. Something like this...
<template name="ob">
<h4>Table test- {{name}}</h4>
<svg id="obTable"><table><tr></tr></table></svg>
{{doD3Stuff}}
</template>
Template.ob.helpers(function() {
doD3Stuff: function() {
// all your on render code here
//Width and height
var w = 600;
var h = 350;
//Define key function, to be used when binding data
var key = function (d) {
return d.index;
};
//Create SVG element
var svg = d3.select("#obTable")
.attr("width", w)
.attr("height", h);
var dataset = require('../data/ob.json');
// var dataset = Bars.find({}).fetch();
//Select…
var table = svg.selectAll('table').append('table')
.style("border-collapse", "collapse")
.style("border", "2px black solid");
// .data(dataset, key);
console.log(table);
var rows = table.selectAll('tr')
.data(dataset, key)
.enter()
.append('tr');
console.log(rows);
rows.selectAll('td')
.data(function(d){ console.log(d); return d;} )
.enter()
.append('td')
.text(function(d) {console.log("here"); return d;})
.style("border", "1px black solid")
.style("padding", "10px")
.style("font-size","12px");
}

piechart over a map point using d3.js

I want to draw a pie chart for every point on the map instead of a circle.
The map and the points are displaying well but the pie chart is not showing over the map points. There is no error also. I can see the added pie chart code inside map also.
Below is the code snippet .
var w = 600;
var h = 600;
var bounds = [[78,30], [87, 8]]; // rough extents of India
var proj = d3.geo.mercator()
.scale(800)
.translate([w/2,h/2])
.rotate([(bounds[0][0] + bounds[1][0]) / -2,
(bounds[0][1] + bounds[1][1]) / -2]); // rotate the project to bring India into view.
var path = d3.geo.path().projection(proj);
var map = d3.select("#chart").append("svg:svg")
.attr("width", w)
.attr("height", h);
var india = map.append("svg:g")
.attr("id", "india");
var gDataPoints = map.append("g"); // appended second
d3.json("data/states.json", function(json) {
india.selectAll("path")
.data(json.features)
.enter().append("path")
.attr("d", path);
});
d3.csv("data/water.csv", function(csv) {
console.log(JSON.stringify(csv))
gDataPoints.selectAll("circle")
.data(csv)
.enter()
.append("circle")
.attr("id", function (d,i) {
return "chart"+i;
})
.attr("cx", function (d) {
return proj([d.lon, d.lat])[0];
})
.attr("cy", function (d) {
return proj([d.lon, d.lat])[1];
})
.attr("r", function (d) {
return 3;
})
.each(function (d,i) {
barchart("chart"+i);
})
.style("fill", "red")
//.style("opacity", 1);
});
function barchart(id){
var data=[15,30,35,20];
var radius=30;
var color=d3.scale.category10()
var svg1=d3.select("#"+id)
.append("svg").attr('width',100).attr('height',100);
var group=svg1.append('g').attr("transform","translate(" + radius + "," + radius + ")");
var arc=d3.svg.arc()
.innerRadius('0')
.outerRadius(radius);
var pie=d3.layout.pie()
.value(function(d){
return d;
});
var arcs=group.selectAll(".arc")
.data(pie(data))
.enter()
.append('g')
.attr('class','arc')
arcs.append('path')
.attr('d',arc)
.attr("fill",function(d,i){
return color(d.data);
//return colors[i]
});
}
water.csv:
lon,lat,quality,complaints
80.06,20.07,4,17
72.822,18.968,2,62
77.216,28.613,5,49
92.79,87.208,4,3
87.208,21.813,1,12
77.589,12.987,2,54
16.320,75.724,4,7
In testing your code I was unable to see the pie charts rendering, at all. But, I believe I still have a solution for you.
You do not need a separate pie chart function to call on each point. I'm sure that there are a diversity of opinions on this, but d3 questions on Stack Overflow often invoke extra functions that lengthen code while under-utilizing d3's strengths and built in functionality.
Why do I feel this way in this case? It is hard to preserve the link between data bound to svg objects and your pie chart function, which is why you have to pass the id of the point to your function. This will be compounded if you want to have pie chart data in your csv itself.
With d3's databinding and selections, you can do everything you need with much simpler code. It took me some time to get the hang of how to do this, but it does make life easier once you get the hang of it.
Note: I apologize, I ported the code you've posted to d3v4, but I've included a link to the d3v3 code below, as well as d3v4, though in the snippets the only apparent change may be from color(i) to color[i]
In this case, rather than calling a function to append pie charts to each circle element with selection.each(), we can append a g element instead and then append elements directly to each g with selections.
Also, to make life easier, if we initially append each g element with a transform, we can use relative measurements to place items in each g, rather than finding out the absolute svg coordinates we would need otherwise.
d3.csv("water.csv", function(error, water) {
// Append one g element for each row in the csv and bind data to it:
var points = gDataPoints.selectAll("g")
.data(water)
.enter()
.append("g")
.attr("transform",function(d) { return "translate("+projection([d.lon,d.lat])+")" })
.attr("id", function (d,i) { return "chart"+i; })
.append("g").attr("class","pies");
// Add a circle to it if needed
points.append("circle")
.attr("r", 3)
.style("fill", "red");
// Select each g element we created, and fill it with pie chart:
var pies = points.selectAll(".pies")
.data(pie([0,15,30,35,20]))
.enter()
.append('g')
.attr('class','arc');
pies.append("path")
.attr('d',arc)
.attr("fill",function(d,i){
return color[i];
});
});
Now, what if we wanted to show data from the csv for each pie chart, and perhaps add a label. This is now done quite easily. In the csv, if there was a column labelled data, with values separated by a dash, and a column named label, we could easily adjust our code to show this new data:
d3.csv("water.csv", function(error, water) {
var points = gDataPoints.selectAll("g")
.data(water)
.enter()
.append("g")
.attr("transform",function(d) { return "translate("+projection([d.lon,d.lat])+")" })
.attr("class","pies")
points.append("text")
.attr("y", -radius - 5)
.text(function(d) { return d.label })
.style('text-anchor','middle');
var pies = points.selectAll(".pies")
.data(function(d) { return pie(d.data.split(['-'])); })
.enter()
.append('g')
.attr('class','arc');
pies.append("path")
.attr('d',arc)
.attr("fill",function(d,i){
return color[i];
});
});
The data we want to display is already bound to the initial g that we created for each row in the csv. Now all we have to do is append the elements we want to display and choose what properties of the bound data we want to show.
The result in this case looks like:
I've posted examples in v3 and v4 to show a potential implementation that follows the above approach for the pie charts:
With one static data array for all pie charts as in the example: v4 and v3
And by pulling data from the csv to display: v4 and v3

Is it possible to add labeled points to a dc.js line chart?

I like dcjs, http://bl.ocks.org/d3noob/6584483 but the problem is I see no labels anywhere for the line chart (Events Per Hour). Is it possible to add a label that shows up just above the data point, or even better, within a circular dot at the tip of each data point?
I attempted to apply the concepts in the pull request and came up with:
function getLayers(chart){
var chartBody = chart.chartBodyG();
var layersList = chartBody.selectAll('g.label-list');
if (layersList.empty()) {
layersList = chartBody.append('g').attr('class', 'label-list');
}
var layers = layersList.data(chart.data());
return layers;
}
function addDataLabelToLineChart(chart){
var LABEL_FONTSIZE = 50;
var LABEL_PADDING = -19;
var layers = getLayers(chart);
layers.each(function (d, layerIndex) {
var layer = d3.select(this);
var labels = layer.selectAll('text.lineLabel')
.data(d.values, dc.pluck('x'));
labels.enter()
.append('text')
.attr('class', 'lineLabel')
.attr('text-anchor', 'middle')
.attr('x', function (d) {
return dc.utils.safeNumber(chart.x()(d.x));
})
.attr('y', function (d) {
var y = chart.y()(d.y + d.y0) - LABEL_PADDING;
return dc.utils.safeNumber(y);
})
.attr('fill', 'white')
.style('font-size', LABEL_FONTSIZE + "px")
.text(function (d) {
return chart.label()(d);
});
dc.transition(labels.exit(), chart.transitionDuration())
.attr('height', 0)
.remove();
});
}
I changed the "layers" to be a new group rather than using the existing "stack-list" group so that it would be added after the data points and therefore render on top of them.
Here is a fiddle of this hack: https://jsfiddle.net/bsx0vmok/

trying to rotate a globe in d3, centering on a particular country

There is probably a simple answer to this question... . I'm using d3 to create a globe, showing all countries. I also have a div with the name of all the countries in it. When I click on a country name, I want the globe to spin to that country. But I'm having trouble getting the syntax right. Can anyone help, please?
var feature;
var projection = d3.geo.azimuthal()
.scale(zoom)
.origin([-71.03,42.37])
.mode("orthographic")
.translate([380, 450]);
var circle = d3.geo.greatCircle()
.origin(projection.origin());
var scale = {
orthographic: 380,
stereographic: 380,
gnomonic: 380,
equidistant: 380 / Math.PI * 2,
equalarea: 380 / Math.SQRT2
};
var path = d3.geo.path()
.projection(projection);
var svg = d3.select("#globe").append("svg:svg")
.attr("width", 800)
.attr("height", 800)
.on("dblclick", dblclick)
.on("mousedown", mousedown);
var g = svg.append("g");
d3.json("simplified.geojson", function(collection) {
g.append("g")
.attr("id", "countries")
g.append("g")
.selectAll("path")
.data(collection.features)
.enter().append("svg:path")
.attr("d", clip)
.attr("id", function(d) { return d.properties.ISO3; })
.attr("fill", function(d) { return d.properties.FILL; }) //change color and make clickable if data on this country exists
.on("mouseover", pathOver)
.on("mouseout", pathOut)
.on( "dblclick", dblclick)
.on("mousewheel.zoom", null)
.on("click", click);
feature = svg.selectAll("path");
feature.append("svg:title")
.text(function(d) { return d.properties.NAME; });
//here is where I want to be able to click a country name in the div and have the globe rotate to that country:
$('.represented').click(function(){
var countryabbrev = $(this).attr('id');
projection.origin(projection.invert(#path.centroid(#CAN))); //this line is wrong
refresh(1500);
showPerson(countryabbrev)
});
I've gotten it to find the country and rotate. Now the rotate is sketchy, but at least there's progress:
$('.represented').click(function(){
var countryabbrev = $(this).attr('id');
getCentroid(d3.select("#" + countryabbrev));
//projection.origin(projection.invert(#path.centroid(#CAN)));
projection.origin(getCentroid(d3.select("#" + countryabbrev)));
refresh(1500);
//showPerson(countryabbrev)
});
function getCentroid(selection) {
// get the DOM element from a D3 selection
// you could also use "this" inside .each()
var element = selection.node(),
// use the native SVG interface to get the bounding box
bbox = element.getBBox();
// return the center of the bounding box
return [bbox.x + bbox.width/2, bbox.y + bbox.height/2];
}

D3.js - layouts - value accessor

I'm just starting out with D3.js. I've created a simple enough donut chart using this example. My problem is, if I have an array of objects as my data source - data points for ex. would be a1.foo or a1.bar - and I want to switch between them, how would i go about doing this? My current solution looks ugly and it can't be the proper way of doing it - code below.
//Call on window change event
//Based on some parameter, change the data for the document
//vary d.foo to d.bar and so on
var donut = d3.layout.pie().value(function(d){ return d.foo})
arcs = arcs.data(donut(data)); // update the data
Is there a way I can set the value accessor at run time other than defining a new pie function?
Generally to switch the data that is being displayed you would create a redraw() function that would then update the data for the chart. In the redraw you'll need to make sure to handle the three cases - what should be done when data elements are modified, what should be done when new data elements are added, and what should be done when data elements are removed.
It usually looks something like this (this example changes the data set through panning, but it doesn't really matter). See the full code at http://bl.ocks.org/1962173.
function redraw () {
var rects, labels
, minExtent = d3.time.day(brush.extent()[0])
, maxExtent = d3.time.day(brush.extent()[1])
, visItems = items.filter(function (d) { return d.start < maxExtent && d.end > minExtent});
...
// upate the item rects
rects = itemRects.selectAll('rect')
.data(visItems, function (d) { return d.id; }) // update the data
.attr('x', function(d) { return x1(d.start); })
.attr('width', function(d) { return x1(d.end) - x1(d.start); });
rects.enter().append('rect') // draw the new elements
.attr('x', function(d) { return x1(d.start); })
.attr('y', function(d) { return y1(d.lane) + .1 * y1(1) + 0.5; })
.attr('width', function(d) { return x1(d.end) - x1(d.start); })
.attr('height', function(d) { return .8 * y1(1); })
.attr('class', function(d) { return 'mainItem ' + d.class; });
rects.exit().remove(); // remove the old elements
}

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