I want to create an editable tree graph using Vega. What's the best way to do this?
So far, my approach is to create an overlay layer with inputs for nodes titles (Figure 1). I see the same approach being used in tools like Miro or Whimsical.
The way I do this is I grab vegaView, get nodes layout coordinates (vegaView.data('tree')) and draw my inputs overlay based on it.
Is there a better approach to do this? I'm new to Vega, and I don't know a lot of things about it. Perhaps, I could use triggers or event streams for this somehow. Although, from what I saw so far – Vega can only draw inputs outside of its main drawing area (those bound to signals).
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I am looking for tips on how to approach creating an editable graphic that looks like a pie chart and can be modified by sliding nodes along specific axes. The resulting graphic would look like the image below (created in illustrator).
The closest I have come to finding something similar is a windrose chart.
I have thought of using Bezier.js or something similar but wondering if anyone might know of an existing library that might get close to what I need.
Thank you.
How can I draw a Bezier Line between two non-static DOM elements, like this:
The two lines should be drawn between the
<div class="brick small">Line starts here</div>
and the
<div class="brick small">Line ends here</div>
of this CodePen: https://codepen.io/anon/pen/XeamWe
Note that the boxes can be dragged. If one of the elements changes its position, the line should be updated accordingly.
If I'm not wrong I can't use a canvas, right? What can I use instead?
Let me point you toward the answer I beleve you're looking for, it's a dom element type called 'SVG' which is supported by most if not all web browsers of today (so you won't need to plug in anything external), in which you can draw lines, shapes, apply graphical filters much like in Photoshop and many other useful things, but the one to be pointed out here is the so called 'path', a shape that can consist of both straight lines with sharp corners, or curved lines (bezier) or both combined.
The easiest way to create such paths is to first draw them in for example Illustrator, save the shape in the SVG format, open that file in a text editor and pretty much just copy the generated markup code and paste it into your html, as it is supported there. This will result in the drawn shape to be displayed on your site. But in your case, you won't come around the a little bit complex structuring of the paths, because you wish to have control of it using javascript, so I would suggest first making a few simple paths in this way by exporting from Illustrator, study these in code, then manipulate their bezier values in javascript until you get the hang of how they work, once you've done that you will be able to create the accurate bezier shape you have in mind and (knowing the positions of the elements you want to connect) position them so that they connect your boxes.
Paths can even be decorated with markers, like an arrowhead in the end or beginning of the path, you can even design your own markers as you like them to look and much more if you would dig deeper into it.
Good luck! :)
I need to create a data visualization in a web application, I wanted to use Highcharts since I have some previews experience, the problem is that the visualization I need to create is more custom, based on my investigation I'd need to use something like D3 which allows to do more things, but maybe someone has done something similar using a library with a smaller learning curve.
Is it possible to create a visualization like this (the image to the right) without using D3? Each of the small boxes inside the bars is an element that should be clickable to show it's details inside a card-like HTML element.
I saw this example with Highcharts, but it's not quite what I want and I'm not sure if what I need can also be done.
Thanks in advance for any help.
I am trying to make a visualization using d3 which is basically a scatter plot with links between the points. (I have attached a .gif of the existing java based visualization)
The points can be added by double clicking other points. On hovering over a point, I wish to have links drawn between the point and all its partners on screen.
I have the part where on double clicking a node, its partners are added. What I need help with is drawing the links (primarily I am not able to understand how can I get the x1,y1,x2,y2 values required to draw the links).
This is what my DOM looks like:
I have seen a lot of examples online but somehow not able to figure the solution - if anyone could link me to a similar visualization or share a fiddle/ give some pointers on how this can be achieved I would be really grateful.
First the simple stuff: here are 2 mechanisms for drawing the lines.
Next, in terms of the data representation of the lines, check out how links are typically drawn when working with the force directed layout.
Important: Do not get distracted by the existence of the force layout in this example and by the fact that the force layout works with these links (which are passed into it by calling force.links(links)). That aspect of the example probably doesn't have an equivalent in what you're trying to achieve.
However, do notice how the links array is constructed —— with each element of the array being an object with pointers to source and target datums. In your case, you'll want to work with a similar links array, where source is the node under the mouse and target is a node that's connected to it. So you'll end up with an array of links who all have the same source datum but unique target datums.
You can then bind the links array (via the usual .data() method) to a d3 selection of line or path elements. Once you bind, you can use the usual enter, update, exit pattern to append, update and remove (on mouse out) the drawn lines.
Given a source and target datums, you can calculate the x and y of the endpoints in the same way you currently calculate the translation of each <g> element, presumably using a d3 scale.
I need to create an interactive world map on the front page of a site, the view portal will be about 650x200 pixels. The interactivity would include the following, mouse-over a country would highlight (the countries are will literally be filled with "red" for example) that country and display the countries' name (preferably text in a div), I will also be linking the highlighting event with a that will highlight a country when selected.
I am having a difficult time finding a suitable solution, I refuse to use or learn a proprietry technology such as flash so it is not an option. I created a simple mockup using openlayers and a custom map image but the countries' markers load too slowly in IE6.
Also svg seems too large, as I tried to use RaphaelJS, but abondoned it when I realised the world map data is 1.2mb which is totally un acceptable for the front page of a site..
I am really at a loss on how I am going to do this, my last resort is to manually create 250+ (however many countries there are) pngs and apply mouseover events to hotspots in the image... but this is probably going to be a dead end too.. desperately seeking a solution, any helpful comments will be appreciated!
I developed jVectorMap for that purpose.
Why reinvent the wheel. Google Charts already does this.
I finaly settled with RaphaelJS, importing all the paths from an svg in inkscape, works amazingly well!
We've developed Highmaps, related to Highcharts, to easily solve data visualization problems like this. We also supply a map collection of over 350 maps, optimized for size to keep things lightweight.
For a drilldown example (loading more detailed map on mouse click) see this demo.
Highmaps is free for non-commercial use.
Do you have country coordinate data stored somewhere?
If so setting up functions to parse through the passed in data and create 250+ paths should not be that large.