I'm working on a map that is created by D3.js. I figured out how to zoom in the map and add labels by following Mike Bostock's tutorial. However, after I zoomed in the map, I don't know how to recalculate the coordinates of the labels.
I don't really understand how projection(data.geometry.coordinates) works. It seems projection() will recreate a pair of new coordinates based on the current svg, and somehow automatically place the labels for you. Thus, I tried to run projection() again in the clicked() function, but it doesn't work.
Here is the code that I'm working on, and I'm using d3 version 4, instead of 3.
If you add your towns to the g selection (instead of the svg selection), then it should work fine, as the zoom applies to that selection.
var selection = g
.selectAll("g.classTown")
.data(towns);
updated code: http://plnkr.co/edit/xJvh6LVweZqQUs7GFFH7?p=preview
Related
I am trying to add a movable scale or axis inside a plot. For instance: in this example of stacked plot: Click-to-view
I want to include a movable y-axis scale so, if we hover the graph and put the mouse pointer on the beginning of the orange color of any bar, the a-xis will begin from that bar. (Specifically, moving x=0 line.)
I meant something like this example (of d3).
https://observablehq.com/#d3/index-chart
But, here I want to change the value of x-axis by moving the line. Is it possible to do it using vegalite? If somebody has any similar example in vegalite, can you refer it?
Thank you!
AFAIK, there is no animation in Vega Lite. However, you may check out Gemini which aims to extend the grammar of data viz to some simple animations of single-view Vega/Vega-Lite charts
I am building a version of this parallel coordinate view in d3.js v4.
https://bl.ocks.org/syntagmatic/05a5b0897a48890133beb59c815bd953
In my example I have a predefined selection (in the form of a [min,max] array that I would like to set programatically as a brush in one or more of the axes, after the plot has loaded. But I cannot seem to find a way to do it. Most examples I found on setting a brush from code are using d3 v3 and use setting extent but that does not work anymore in v4 it seems.
can someone give me some tips and a simple example hot to do this in this case (so with multiple axes and brushes active) ?
thanks
Select your brush group and call brush.move, then also pass an array with the start and end coordinates. Your brush move event will then take care of the rest.
d3.select(".brush").call(brush.move, [[startX, endX], [startY, endY]]);
I created a grouped-stacked composite chart using dc.js.
I am wondering if I can add a filterHandler to a composite chart.
I want to filter on each stacks.
It seems that, there is no straight forward way to build a composite chart and hook the parent chart to the volumeChart that would filter all the individual child components at once via dc.js, as Gordon suggested. I came up with a solution for one of my dashboards which is not so modular but works fine & also keep in mind the downsides to this approach pointed out below.
For the above dashboard to work, I defined 3 barCharts and 3 lineCharts overlaid on top the barCharts and chaining them all together linearly to volumeChart.
Although this works fine with a fixed y-axis scale, lineChart fails to align with the barCharts when the I set elasticY(true) on all of them, since the lineChart components seem to pic its own yMax and when I pass the yMax value as window.value from barCharts to the lineChart via .on('renderlet'..., again I fail to read these values due the misalignment of individual chart render times. And of course when I overlay the lineCharts I intrinsically loose/block the interaction with the barCharts and use the line moving average tooltips to view bar data.
I have not tried this yet but found a better way to do the same from Scott Miller - https://stackoverflow.com/a/25188909/5743716
Hope it helps!
In D3 I am working on customizing and adding to #Rengel's timeline (link shown in JS Fiddle.
I've successfully created a similar timeline based on tracks, and it also allows users to filter project data based on checkbox values. Each piece of data now has a tooltip, and there are letters from another dataset populating underneath the projects in the same svg container. Now finally I want to add a brush like this one - wrobstory's from the blocks website.
I have only recently started to work on brush events so I am very much a noob, which is why I am unsure how I am going wrong. There is a JS Fiddle I created at: https://jsfiddle.net/rootseire/2vq8028o/2/ which shows everything working before the brush gets called. When I select a section of the timeline, the brush appears, it calculates indexes and extent. But it changes the y state of the year and the year text then transitions down the page.
I have been trying to see why this is happening, but I think I need to step back from the code as it might be just that I am not referencing the correct element. Here is the code for when the mouse pointer drags over the interface:
vis.on('mousedown', function(){
brush_elm = vis.select(".brush").node();
new_click_event = new Event('mousedown');
new_click_event.pageX = d3.event.pageX;
new_click_event.clientX = d3.event.clientX;
new_click_event.pageY = d3.event.pageY;
new_click_event.clientY = d3.event.clientY;
brush_elm.dispatchEvent(new_click_event);
});
But I think it might have something to do with the .points selector. How can I make the brush target the x-axis, the project rectangles and the letters together?
Thanks in advance,
P
I have an annotated timeline chart that gets new data over ajax. It's working fine, new points come in and I redraw the graph. My graph has two lines, so there are two labels in the legend on top. For whatever stupid reason, every single time the graph is redrawn, the legend labels swap places! So it will say
Foo 5.2 Bar 3.6
And then I'll refresh (and there will be no new data, so the call to redraw is 100% identical to the previous one) and now it says
Bar 3.6 Foo 5.2
In the respective red and blue, of course. What on earth would possess the applet to do this? Is there any way I can control the order of legend labels? I couldn't find anything about it in the official documentation.
Try using google.visualization.DataTable. For example:
dataTable = new google.visualization.DataTable({cols:graphColumns, rows:graphRows});
chart = new google.visualization.AnnotatedTimeLine($('#chart_div')[0]);
chart.draw(dataTable)
I use it this way and don't have any problems with my legend values.