I have a run-of-the-mill nvd3 line chart. Sometimes the data represented by the chart is patchy. I would like to be able to style part of the lines differently to represent this, such as in this example:
Here, the dots are joined by a dashed line when far apart and a full line when close together. Is it possible to apply stroke-dasharray only to certain parts of a path, or do I have to trick nvd3 into creating a new line for each segment where the styling changes?
You can't apply stroke dasharray to part of a path, but you can create a very long stroke dash array that equals the length of your path and carefully calculate the locations of the dashes in JavaScript so that the dashes line up with the part of your path that you would like dashed.
Related
I have changed this code https://bl.ocks.org/nanu146/df39c69d1d0cb1b71429b2cd47e2a189
according to my need. But the x-axis has on first and last position empty line. How can I get rid of it?
I tried to play with xScale but no success. my heatmap result
Thanks for help!
To remove those ticks just do:
axis.tickSizeOuter(0);
According to the API, tickSizeOuter():
...controls the length of the square ends of the domain path, offset from the native position of the axis. Thus, the “outer ticks” are not actually ticks but part of the domain path, and their position is determined by the associated scale’s domain extent [...] An outer tick size of 0 suppresses the square ends of the domain path, instead producing a straight line.
Here is the bl.ocks you linked with that change: https://bl.ocks.org/GerardoFurtado/a5153b4a293d72325c1aaee0b9aaac0c/52d701ca5d5a79809316eef39eafa2ccfc70879b
I'm using Segment Plot to show multiple lines on the chart. How can I make these lines have arrows on their ends?
You can do this with some SVG + DOM hacking. You can define a "marker element" that can be placed at the beginning, middle or end of a line (see http://tutorials.jenkov.com/svg/marker-element.html for details on markers).
This means manipulating the SVG generated by Plottable. To get the underlying DOM elements, you need to get hold of the d3 "selection" representing each line.
Add a marker definition to the <svg> element where you are rendering the plot. I am pretty sure plottable won't overwrite entities already inside, but if it does you can always add it after rendering the plot.
Use Segment#entities to get all "PlotEntity" objects from the plot (http://plottablejs.org/docs/classes/plottable.plots.segment.html#entities).
Use the PlotEntity#selection property (http://plottablejs.org/docs/interfaces/plottable.plots.plotentity.html#selection) to get the set of DOM elements representing each segment.
The "Selection" interface is just a d3 selection (https://github.com/mbostock/d3/wiki/Selections). You can then add the appropriate "marker-end" attribute to each element, which should give you the arrow heads you want.
On the off-chance these lines are vertical, I have a super easy hack. Use .symbol() to create a scatter plot where the points are either up or down arrows, and place them at the ends of the segments.
Otherwise, you may have to draw the arrows yourself. You can get the pixel locations of the ends of the segments like this:
locX = xScale.invert(endpointXValue)
locY = yScale.invert(endpointYValue)
And then you could append an arrow shape to the foreground (see the crosshair container in this example)
I am new to d3 and I am trying to do something like this. Here is what I have done so far JSFiddle, but I don't know how to align the lines to put them like in the picture and also how to put an information box below the chart.
var x=d3.scale.linear().domain([0,r]).range([0,w])
var y=d3.scale.linear().domain([r,0]).range([h,0])
center_group.append('line').attr("x1",x(r/4)).attr("y1",0);
center_group.append('line').attr("x1",x(-r/4)).attr("y1",0);
center_group.append('line').attr("x1",0).attr("y1",x(25));
center_group.append('line').attr("x1",0).attr("y1",x(-r/4));
Thanks!
If I understand correctly, you're trying to align the reticle lines within the circle. I've created a fiddle which should demonstrate a solution to the two issues in your original fiddle.
//circle svg drawn above this point...
center_group.append('line').attr("x1",x(r/6)).attr("y1",0).attr("x2",x(r/5.1));
center_group.append('line').attr("x1",x(-r/6)).attr("y1",0).attr("x2",x(-r/5.1));
center_group.append('line').attr("x1",0).attr("y1",x(19.7)).attr("y2",x(r/6));
center_group.append('line').attr("x1",0).attr("y1",x(-r/6)).attr("y2",x(-r/5.1));
//then include table, as shown here: http://bl.ocks.org/gka/17ee676dc59aa752b4e6
The first issue is that the lines were being drawn before the (white-filled) circle (so any line within the circle was covered). Second issue was that the lines were unbounded, so i added x2 and y2 attributes where needed. See picture link for results.
Regarding the information box, you could simply append a text element under the chart and drop your data in there, but for something more robust, you could include a table, as shown in the example linked in my code above (only two links allowed apparently).
I am creating a line chart with grid lines. Here's the similar example: http://bl.ocks.org/hunzy/11110940
I need to change the background of vertical space between X(2) to X(4), X(8) to X(10) and X(12) to X(14) on mouse hover. But I am not able to understand how to use D3 to reference those spaces between the grid lines.
There is nothing there to click on/hover over. The normal axis/grid creates lines, not rectangles. You would need to change the default behave of the axis objects to create "invisible, but clickable" rectangles in order to be able to attach a mouse event to those spaces.
I don't know if this is the recommended approach but it seems like it could work. After the axis has been created:
something
.attr('class','xaxis')
.call(xAxis)
You could select the ticks with something like this:
d3.select(svg).select('.xaxis g.tick').each(function(){
// this.transform will be "translate(X,Y)"
})
In the function you can query the existing properties of the g elements and extract the transform attribute which will contain the X and Y offset for the "tick". This can be used to determine one dimension of your rectangle objects. The other dimension is determined by the size of the other axis or something like that.
I would like to display a marker on a bullet chart even when the number is zero; however, I can't find the area in either bullet.js or bulletChart.js where I can keep it from removing the marker. This is the example that I'm implementing in my project: http://nvd3.org/examples/bullet.html
The charts work otherwise, but I just can't get that to work.
Set it to the text "0", rather than the number.
Since you're using dynamic data, you'll need to do a special case check.