d3.js - Using D3, how can I transition a line one point at time? -


i'm working on visualization project in 1 component line chart overlayed on bar graph. delayed bar transitions @ time. line transition each point on line remains "attached" bar.

here's code line:

var line = d3.svg.line()  .x(function(d, i) {     return xscale(i) + 20;  })  .y(function(d) {     return h - yscale(parsefloat(d.performance));  });  svg1.append("svg:path").attr("d", line(dataset[0].months));

and here's transition it:

svg1.select("path")     .transition()     .ease("linear")     .duration(1000)     .attr("d", line(dataset[count].months));

i've seen other questions addressing d3 line transitions none seem address issue, hope i'm not repeater. in advance!

note: did try putting delay() function in after transition didn't work. i'm assuming because line single <path> instead of multiple <rect> elements...

so fell off radar while, had time other day , figured out 1 approach doing delayed transition...

here pen wrote. generated random data , created simple line chart showing stock prices play around with. trick here instead of iterating through selection of elements using transition, iterate through dataset updating point point , transitioning line go:

dataset.foreach(function(item, index) {   let set = dataset.slice();    // update current point in copy   set[index].price = newprice();    stock_line.transition()             .delay(index * 500)             .attr('d', line_generator(set)); });

admittedly bit hacky , possibly overkill, update whole line @ once. @lars mentioned possibility of using stroke-dashoffset trick accomplish well. have played around method animate drawing line i'm not sure how i'd use accomplish same delayed animation shown in pen. if there less hacky implementation please let me know , i'll update answer.


Comments

Post a Comment

Popular posts from this blog

get url and add instance to a model with prefilled foreign key :django admin -

Image
i have page in each contest shown in row. each row contains contest id , link other model names have foreign key contest. news model: class news(models.model): title = models.charfield(max_length=50, null=true) description = models.textfield() time = models.timefield( default= datetime.datetime.now().time()) contest = models.foreignkey(contest) i want use admin adding , changing these models. want when user clicks on 'news' has foreign key contest id=1, shows list of news value foreign key. use {% instance in instances %} <tr class="{% cycle 'row1' 'row2' %}"> <td>{{ instance.title }}</td> <td>{{ instance.starttime }}</td> <td>{{ instance.timespan }}</td> <td>{{ instance.date }}</td> <td><a href="/adm...
Read more

android - Keyboard hides my half of edit-text and button below it even in scroll view -

i having trouble keyboard covers edit-text , half of button in scroll view. here's layout , please tell me how should resolve problem. many questions on topic none of them s working me. <?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:background="@drawable/bg" android:layout_height="match_parent"> <scrollview android:layout_width="match_parent" android:fillviewport="true" android:layout_height="match_parent"> <relativelayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical"> <linearlayout android:layout_width="match_parent" android:layout_height="w...
Read more

css - Make div keyboard-scrollable in jQuery Mobile? -

from can tell, although jquery-mobile-powered pages can contain divs overflow set scroll or auto, , these divs can scrolled one-screen bar or mouse wheel, cannot scrolled using arrow keys, page-up/page-down, or home/end. instead, official "page" div (with data-role="page") absorbs input. perhaps other divs can't acquire focus, i'm not sure. is there way around this? edit: jsfiddle of simple example: https://jsfiddle.net/qogz0shx/ <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script> <script src="https://ajax.googleapis.com/ajax/libs/jquerymobile/1.4.5/jquery.mobile.min.js"> </script> <link rel="stylesheet" href="https://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.css"/> <style> #outer { overflow:scroll; height: 50vh; width: 50vw; } #inner { height: 500vh; width: 500vw; } ...
Read more