D3.js (or similar) Overlapping Bar Chart? - javascript

Using D3.js Is there an option to overlay one bar over another?
I need two independent columns to indicate start and end time (x axis) against a count (y axis). I want BOTH columns to be overlaid over each other (similar start time e.g x1=8:45am, x2=10:05, and same end times. y1=90, y2=108), both columns will have transparency around 0.5, so each column can be seen over the common time/count range.
A similar example using Highcharts:
http://jsfiddle.net/gopinaghr/q8Udk/
// This page provides an example in highcharts
{ I need same for D3}
I need to create a chart where
Column width dependant on (end_time - start_time)
Column x origin is dependant on start time
Column height dependant on y value
The columns need opacity less than 1.

d3.js requires you to explicitly place your bars at coordinates, so, you can put your bars where ever you like:
// create a group for your overlapped bars
var g = svg.selectAll(".bars")
.data(data)
.enter().append("g")
// place the first bar
g.append("rect")
.attr("class", "bar1")
.attr("x", function(d) {
return x(d.letter) + 10; // center it
})
.attr("width", x.rangeBand() - 20) // make it slimmer
.attr("y", function(d) {
return y(d.col1);
})
.attr("height", function(d) {
return height - y(d.col1);
});
// place the second bar on top of it
g.append("rect")
.attr("class", "bar2")
.attr("x", function(d) {
return x(d.letter);
})
.attr("width", x.rangeBand())
.attr("y", function(d) {
return y(d.col2);
})
.attr("height", function(d) {
return height - y(d.col2);
});
Here's a quick example.
EDITS
To add in time, you have to make a number of changes.
Set up a time formatter, to parse your date/times out of your file:
// say date/times are local 20160622 15:00
var timeFormatter = d3.time.format("%Y%m%d %H:%M")
Set up a time x-scale for your axis:
// x scale showing 1 day - 06/22/2015
var x = d3.time.scale()
.range([0,width])
.domain([timeFormatter.parse("20150621 00:00"), timeFormatter.parse("20150622 00:00")])
And when you draw the rect, with width is the number of pixels from endTime to startTime:
g.append("rect")
.attr("class", "bar1")
.attr("x", function(d) {
return x(d.startTime1); // start at startTime
})
.attr("width", function(d,i){
return x(d.endTime1) - x(d.startTime1); // pixel width from end to start
})
.attr("y", function(d) {
return y(d.col1);
})
.attr("height", function(d) {
return height - y(d.col1);
});
Example here.

Related

D3js legend color does not match to the map color javascript

I have a map already drawed. I would like to add a legend using d3.js. For example when filering by length, the map should show differents colors. Since a week, I couldn't achieve this task. My map color seem to be good but the legend does not match.
Could anybody help me with my draw link function ?
https://jsfiddle.net/aba2s/xbn9euh0/12/)
I think it's the error is about the legend function.
Here is the function that change my map color Roads.eachLayer(function (layer) {layer.setStyle({fillColor: colorscale(layer.feature.properties.length)})});
function drawLinkLegend(dataset, colorscale, min, max) {
// Show label
linkLabel.style.display = 'block'
var legendWidth = 100
legendMargin = 10
legendLength = document.getElementById('legend-links-container').offsetHeight - 2*legendMargin
legendIntervals = Object.keys(colorscale).length
legendScale = legendLength/legendIntervals
// Add legend
var legendSvg = d3.select('#legend-links-svg')
.append('g')
.attr("id", "linkLegendSvg");
var bars = legendSvg.selectAll(".bars")
//.data(d3.range(legendIntervals), function(d) { return d})
.data(dataset)
.enter().append("rect")
.attr("class", "bars")
.attr("x", 0)
.attr("y", function(d, i) { return legendMargin + legendScale * (legendIntervals - i-1); })
.attr("height", legendScale)
.attr("width", legendWidth-50)
.style("fill", function(d) { return colorscale(d) })
// create a scale and axis for the legend
var legendAxis = d3.scaleLinear()
.domain([min, max])
.range([legendLength, 0]);
legendSvg.append("g")
.attr("class", "legend axis")
.attr("transform", "translate(" + (legendWidth - 50) + ", " + legendMargin + ")")
.call(d3.axisRight().scale(legendAxis).ticks(10))
}
D3 expects your data array to represent the elements you are creating. It appears you are passing an array of all your features: but you want your scale to represent intervals. It looks like you have attempted this approach, but you haven't quite got it.
We want to access the minimum and maximum values that will be provided to the scale. To do so we can use scale.domain() which returns an array containing the extent of the domain, the min and max values.
We can then create a dataset that contains values between (and including) these two endpoints.
Lastly, we can calculate their required height based on how high the visual scale is supposed to be by dividing the height of the visual scale by the number of values/intervals.
Then we can supply this information to the enter/update/exit cycle. The enter/update/exit cycle expects one item in the data array for every element in the selection - hence why need to create a new dataset.
Something like the following shold work:
var dif = colorscale.domain()[1] - colorscale.domain()[0];
var intervals = d3.range(20).map(function(d,i) {
return dif * i / 20 + colorscale.domain()[0]
})
intervals.push(colorscale.domain()[1]);
var intervalHeight = legendLength / intervals.length;
var bars = legendSvg.selectAll(".bars")
.data(intervals)
.enter().append("rect")
.attr("class", "bars")
.attr("x", 0)
.attr("y", function(d, i) { return Math.round((intervals.length - 1 - i) * intervalHeight) + legendMargin; })
.attr("height", intervalHeight)
.attr("width", legendWidth-50)
.style("fill", function(d, i) { return colorscale(d) })
In troubleshooting your existing code, you can see you have too many elements in the DOM when representing the scale. Also, Object.keys(colorscale).length won't produce information useful for generating intervals - the keys of the scale are not dependent on the data.
eg

Updating chart data, but not all bars redrawing

I'm working on a bar chart that updates its data based on the mouseover of another element. When the chart updates, if there are less bars in the new chart, the chart permanently has fewer bars and changing the data back does not add them back in. I've added a gif to show this - when it gets down to 3 bars, they never come back.
Here's my code:
var scatter_versus_dataset; // the main set
var scatter_versus_dataset_filtered;
// set versus y scale
scatter_versus_y = d3.scaleBand().range([0, SCATTER_VERSUS_HEIGHT])
// set versus x scale
scatter_versus_x_fatal = d3.scaleLinear().range([0, SCATTER_VERSUS_WIDTH / 3]);
scatter_versus_x_nonfatal = d3.scaleLinear().range([-1 * SCATTER_VERSUS_WIDTH / 3, 0 ])
// set the versus colors
scatter_versus_z = d3.scaleOrdinal().range(STACK_COLOURS);
...
function updateScatterVersus(code){
// filter the set
scatter_versus_dataset_filtered = scatter_versus_dataset.filter(function (d) { return (d.majorOccCodeGroup == code) })
scatter_versus_y.domain(scatter_versus_dataset_filtered.map(function (d) { return d.occupation; })).padding(BAR_PADDING);
scatter_versus_x_fatal.domain([0, d3.max(scatter_versus_dataset_filtered, function (d) { return d.f_total_rate; })]).nice();
scatter_versus_x_nonfatal.domain([d3.min(scatter_versus_dataset_filtered, function (d) { return +-1 * d.nf_total_rate; }), 0]).nice();
var bars = d3.selectAll("#scatter_versus_fatal_rect")
.data(scatter_versus_dataset_filtered)
bars.exit()
.remove()
bars.transition()
.duration(600)
.attr("y", function (d) {
return scatter_versus_y(d.occupation);
})
.attr("x", function (d) {
return scatter_versus_x_fatal(0) + SCATTER_VERSUS_GAP_HALF;
})
.attr("width", function (d) {
return scatter_versus_x_fatal(d.f_total_rate);
})
.attr("height", scatter_versus_y.bandwidth())
bars.enter()
.append("rect")
.attr('id', 'scatter_versus_fatal_rect')
.classed("bar", true)
.attr("y", function (d) {
return scatter_versus_y(d.occupation);
})
.attr("x", function (d) {
return scatter_versus_x_fatal(0) + SCATTER_VERSUS_GAP_HALF;
})
.attr("width", function (d) {
return scatter_versus_x_fatal(d.f_total_rate);
})
.attr("height", scatter_versus_y.bandwidth())
}
The process for redrawing the other side of the chart is exactly the same. The problem is still there if i only draw one of the sides.
The data is just from a csv, and I don't think it's the problem - the filtered set has the right number of entries and it's fine in other charts. It's probably something to do with the removal and redrawing but I can't find many examples of this. Or perhaps a key? I can upload some data if needed but it's a pretty big CSV.
id in HTML is unique, only 1 tag should have it.
Select the div for the bars, then selectAll tags with class is bar and bind data.
Remove the id you add to the rects.
var bars = d3.select("#scatter_versus_fatal_rect")
.selectAll(".bar")
.data(scatter_versus_dataset_filtered);
bars.enter()
.append("rect")
// .attr('id', 'scatter_versus_fatal_rect')
.classed("bar", true)
......

D3.js: Understanding Zoom in terms of svg

I have been looking into this d3.js block Timeline with Zoom. However, I am not able to figure out how the zoom function is actually implemented. Could somebody help me understand?
Frankly, there is no zoom happening.
var brush = d3.svg.brush()
.x(x)
.on("brush", display);//this calls display function on brush event drag.
Inside display function.
minExtent = brush.extent()[0],//this give the brush extent min
maxExtent = brush.extent()[1],//this give the brush extent max
Based on the max and min of the brush filter the data:
visItems = items.filter(function(d) {return d.start < maxExtent && d.end > minExtent;});
Reset the domain with the brush's max and min.
x1.domain([minExtent, maxExtent]);
Select all rectangles in the upper area not having the brush associate data to the DOM.
update it with the new scale values
rects = itemRects.selectAll("rect")
.data(visItems, function(d) { return d.id; })
.attr("x", function(d) {return x1(d.start);})
.attr("width", function(d) {return x1(d.end) - x1(d.start);});
create any new rectangles if the data is present but DOM is not present.
rects.enter().append("rect")
.attr("class", function(d) {return "miniItem" + d.lane;})
.attr("x", function(d) {return x1(d.start);})
.attr("y", function(d) {return y1(d.lane) + 10;})
.attr("width", function(d) {return x1(d.end) - x1(d.start);})
.attr("height", function(d) {return .8 * y1(1);});
Remove all the rectangle outsside the brush extent or not in the filtered item list visItems
rects.exit().remove();
Exactly the same for labels as done for rectangles above.
Hope this clears all your doubts.
I'm not sure but I think this is just a trick with D3 scales.
What happens is that it gets the selection below (which is a projection a 100% of with from time 0 to time 100) and plots into a new scale from time 50 to time 80 with the same width.
This will make the scale change in a way that looks like you zoomed on that time moment in time.

D3.js Rotate Vertical Bar Graph Labels

I'm new to D3.js and using following example from D3.js to create a simple dashboard for one of my web application.
http://bl.ocks.org/NPashaP/96447623ef4d342ee09b
My requirement is to rotate top value labels of each bar vertically by 90 degrees.
I changed following method by adding "transform" attribute. Then the labels do not align properly.
//Create the frequency labels above the rectangles.
bars.append("text").text(function(d){ return d3.format(",")(d[1])})
.attr("x", function(d) { return x(d[0])+x.rangeBand()/2; })
.attr("y", function(d) { return y(d[1])-5; })
.attr("text-anchor", "middle")
.attr("transform", function(d) { return "rotate(-90)" });
I tried to find a solution for long time but couldn't. Links to my codes are given below.
https://jsfiddle.net/vajee555/7udmyj1k/
Can anybody please give me an idea how to archive this?
Thanks!
EDIT:
I have solved the problem here.
http://jsfiddle.net/vajee555/7udmyj1k/5/
Remember that when you rotate an element, the x and y coordinates are changed: they are no longer with respect to that of the chart, but with respect to the new rotated orientation of the element. Therefore, you will need to compute the x and y attributes differently.
By rotating -90deg, your x axis will be flipped to y, and the y will be flipped to -x:
I have made some small pixel adjustments to make it appear aesthetically pleasing, such as the +8 I have added to the y coordinate and the +5 I have added to the x coordinate, but the fine tuning is up to you.
// Create the frequency labels above the rectangles.
bars.append("text").text(function(d){ return d3.format(",")(d[1])})
.attr('transform', 'rotate(-90)')
.attr("y", function(d) { return x(d[0]) + x.rangeBand()/2 + 4; })
.attr("x", function(d) { return -y(d[1]) + 5; });
Also, change how the coordinates are calculated in the hG.update() function:
// transition the frequency labels location and change value.
bars.select("text").transition().duration(500)
.text(function(d){ return d3.format(",")(d[1])})
.attr("x", function(d) { return -y(d[1]) + 5; });
See working fiddle here: https://jsfiddle.net/teddyrised/7udmyj1k/2/
//Create the frequency labels above the rectangles.
bars.append("text").text(function(d){ return d3.format(",")(d[1])})
.attr("x", function(d) { return x(d[0])+x.rangeBand()/2; })
.attr("y", function(d) { return y(d[1])-5; })
.attr("text-anchor", "middle")
.attr("transform", "rotate(-90,0,0)" );
Change the last line as above.

d3.js Bubble Force Chart application

http://jsfiddle.net/pPMqQ/146/
I'm developing a bubble chart application that is a derivative of a force chart to provide a little bit of movement.
Here is some of the code. As I create the svg - I also set up the viewBox - which I think could be used to adjust the size of the chart - but I've not been able to adjust the ratios properly to get the correct scaling.
I've also added here the code that adds the nodes - as the node size is calculated - its using a scale variable to affect the size of the orbs.
var svg = d3.select(selector)
.append("svg")
.attr("class", "bubblechart")
.attr("width", parseInt(w + margin.left + margin.right,10))
.attr("height", parseInt(h + margin.top + margin.bottom,10))
.attr('viewBox', "0 0 "+parseInt(w + margin.left + margin.right,10)+" "+parseInt(h + margin.top + margin.bottom,10))
.attr('perserveAspectRatio', "xMinYMid")
.append("g")
.attr("transform", "translate(0,0)");
methods.force = d3.layout.force()
.charge(1000)
.gravity(100)
.size([methods.width, methods.height])
var bubbleholder = svg.append("g")
.attr("class", "bubbleholder")
var bubbles = bubbleholder.append("g")
.attr("class", "bubbles")
var labelbubble = bubbleholder.append("g")
.attr("class", "labelbubble")
// Enter
nodes.enter()
.append("circle")
.attr("class", "node")
.attr("cx", function (d) { return d.x; })
.attr("cy", function (d) { return d.y; })
.attr("r", 1)
.style("fill", function (d) { return methods.fill(d.label); })
.call(methods.force.drag);
// Update
nodes
.transition()
.delay(300)
.duration(1000)
.attr("r", function (d) { return d.radius*scale; })
// Exit
nodes.exit()
.transition()
.duration(250)
.attr("cx", function (d) { return d.x; })
.attr("cy", function (d) { return d.y; })
.attr("r", 1)
.remove();
I have the remaining issues
scaling is an issue
I've set the width/heights via data attributes - currently I have a scaling variable set to adjust the size of the orbs depending on the width of the chart. I would like to find a more scientific way of ensuring the chart is resized accordingly and also that the elements always remain central (don't become obscured).
ensuring the smaller elements are on top of the big elements
I've also noticed that small objects may randomly fall underneath larger orbs, is there a way to organize the rendering of the orbs dependant on size, so bigger elements always sit at the bottom layer.
I've solved the second problem by sorting the data via value.
http://jsfiddle.net/pPMqQ/149/
data = data.sort(function(a, b) {return b.value - a.value})
Currently I have a scale variable depending on the width of the chart - var scale = methods.width*.005;
but its not very scientific per say
If the chart is 150 width
http://jsfiddle.net/pPMqQ/150/
the chart renders - but the bubbles no longer fit in the space.
the chart at 250 px
http://jsfiddle.net/pPMqQ/151/

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