d3 zoom: disable mouse drag? - user-interface

I want zoom + brush on a bar chart. I was able to implement zooming ok: demo here, but I found out that after zooming, when you mouse down to drag, the bar chart moves. I don't want the bar chart to move on mouse drag. I want the bar chart to stay in its original place and I want to use the mouse drag for brushing. The bar chart could probably scroll left and right, but it should not be dragged left and right.
How do I make the bar chart stay in its original place?
My code snippet is below. Full script here (134 lines)
var zoom = d3.behavior.zoom()
.x(x)
.scaleExtent([0.8, 10])
.on("zoom", zoomed);
function zoomed() {
// scale x axis
svg.select(".x.axis").call(xAxis);
// scale the bars
var width_scaled = columnwidth * d3.event.scale;
svg.selectAll(".bargroup rect")
.attr("x", function(d) {return x(d.date) - width_scaled/2;})
.attr("width", width_scaled);
}
var brush = d3.svg.brush()
.x(x)
.on("brush", brushed);
function brushed() {
//console.log(brush.extent());
}
var svg = d3.select("#timeline").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")")
.call(zoom);
svg.append("g")
.attr("class", "x brush")
.call(brush)
.selectAll("rect")
.attr("y", -6)
.attr("height", height + 7);

Related

Mouseover event for barchart in D3

I am having trouble creating a mouseOver event for my D3 visualization for a class. I have a bar chart I created and want to make it so when I mouse over each bar, it displays a small div with the actual values of the bar inside. I have created the barchart I want and am trying integrate a section of code from one of our earlier labs in class, where we added this hover functionality to the barchart visualization but I am just not able to get anything to work.
Here is the code for my index.html with a working graph
<!DOCTYPE html>
<meta charset="utf-8">
<!-- Load d3.js -->
<script src="https://d3js.org/d3.v4.js"></script>
<!-- Create a div where the graph will take place -->
<div id="my_dataviz"></div>
<div style ="float:right; padding-right:300px" id="tooltip"></div>
<script>
// set the dimensions and margins of the graph
var margin = {top: 30, right: 30, bottom: 70, left: 60},
width = 460 - margin.left - margin.right,
height = 400 - margin.top - margin.bottom;
// append the svg object to the body of the page
var svg = d3.select("#my_dataviz")
.append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform",
"translate(" + margin.left + "," + margin.top + ")");
// Parse the Data
d3.csv("Embiid3pt.csv", function(data) {
// X axis
var x = d3.scaleBand()
.range([ 0, width ])
.domain(data.map(function(d) { return d.player; }))
.padding(0.2);
svg.append("g")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x))
.selectAll("text")
.attr("transform", "translate(-10,0)rotate(-45)")
.style("text-anchor", "end");
svg.append("text")
.attr("transform",
"translate(" + (width/2) + " ," +
(height + margin.top + 25) + ")")
.style("text-anchor", "middle")
.text("Player Name");
// Add Y axis
var y = d3.scaleLinear()
.domain([0, 0.7])
.range([ height, 0]);
svg.append("g")
.call(d3.axisLeft(y));
// text label for the y axis
svg.append("text")
.attr("transform", "rotate(-90)")
.attr("y", 0 - margin.left)
.attr("x",0 - (height / 2))
.attr("dy", "1em")
.style("text-anchor", "middle")
.text("Three Point Percentage");
// Bars
svg.selectAll("mybar")
.data(data)
.enter()
.append("rect")
.attr("x", function(d) { return x(d.player); })
.attr("y", function(d) { return y(d.percentage); })
.attr("width", x.bandwidth())
.attr("height", function(d) { return height - y(d.percentage); })
.attr("fill", "#69b3a2")
})
</script>
And here is the CSV data I'm loading in:
player,percentage
Joel Embiid,0.377
Bam Adebayo,0.143
Clint Capela,0
Anthony Davis,0.26
Nikola Vucevic,0.339
Deandre Ayton,0.250
Jarrett Allen,0.189
Kristaps Porzingis,0.353
Finally, here is the section of code that we used earlier in the course to give the mouseover event to the bars of the bar chart:
let bars = chart.append('g')
.selectAll("rect")
.data(data)
.join("rect")
.attr("x", function (d) { return x(d.name); } )
.attr("y", function (d) { return y(d.value); } )
.attr("fill", function(d) { return ordinal(d.name) })
.attr("width", x.bandwidth()) //use the bandwidth returned from our X scale
.attr("height", function(d) { return height - y(+d.value); }) //full height - scaled y length
.style("opacity", 0.75)
bars //let's attach an event listener to points (all svg circles)
.on('mouseover', (event,d) => { //when mouse is over point
d3.select(event.currentTarget) //add a stroke to highlighted point
.style("stroke", "black");
d3.select('#tooltip2') // add text inside the tooltip div
.style('display', 'block') //make it visible
.html(`
<h1 class="tooltip-title">${d.name}</h1>
<div>Highway (HWY) MPG: ${d.value}</div>
`);
})
.on('mouseleave', (event) => { //when mouse isnt over point
d3.select('#tooltip2').style('display', 'none'); // hide tooltip
d3.select(event.currentTarget) //remove the stroke from point
.style("stroke", "none");
});
How do I integrate this final section of code into my index.html to get this mouseover event to work? I already created the tooltip div at the top of the index which will display the values once you mouse over.

d3 v4 x-axis long labels are half hidden

I am working on sample responsive d3 v4 bar chart, here the x-axis labels are bit long so it is not fully visible in the chart. Please check the Fiddle code: http://jsfiddle.net/NayanaDas/w13y5kts/4/
JavaScript code:
// set the dimensions and margins of the graph
var margin = {
top: 20,
right: 20,
bottom: 30,
left: 40
},
width = 550 - margin.left - margin.right,
height = 300 - margin.top - margin.bottom;
// set the ranges
var x = d3.scaleBand()
.range([0, width])
.padding(0.1);
var y = d3.scaleLinear()
.range([height, 0]);
//define tooltip
var tip = d3.tip()
.attr('class', 'd3-tip')
.offset([20, 0])
.html(function(d) {
return "<strong>Sales:</strong> <span style='font-weight:normal;color:red'>" + d.sales + "</span>";
});
// append the svg object to the body of the page
// append a 'group' element to 'svg'
// moves the 'group' element to the top left margin
var svg = d3.select("#container").append("svg")
//.attr("width", width + margin.left + margin.right)
//.attr("height", height + margin.top + margin.bottom)
.attr("preserveAspectRatio", "xMinYMin meet")
.attr("viewBox", "0 0 550 300")
.append("g")
.attr("transform",
"translate(" + margin.left + "," + margin.top + ")")
.call(tip);
// Add background color to the chart
svg.append("rect")
.attr("x", 0)
.attr("y", 0)
.attr("width", width)
.attr("height", height)
.attr("class","backbar");
// get the data
//d3.csv("sales.csv", function(error, data) {
// if (error) throw error;
var data = d3.csvParse(d3.select('#data_csv').text());
console.log(data);
// format the data
data.forEach(function(d) {
d.sales = +d.sales;
});
// Scale the range of the data in the domains
x.domain(data.map(function(d) {
return d.name;
}));
y.domain([0, d3.max(data, function(d) {
return d.sales;
})]);
// append the rectangles for the bar chart
svg.selectAll(".bar")
.data(data)
.enter().append("rect")
.attr("class", "bar")
.attr("x", function(d) {
return x(d.name);
})
.attr("width", x.bandwidth())
.attr("y", function(d) {
return y(d.sales);
})
.attr("height", function(d) {
return height - y(d.sales);
})
.on('mouseover', tip.show)
.on('mouseout', tip.hide);
// add the x Axis
svg.append("g")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x))
.selectAll("text")
.style("text-anchor", "end")
.style("fill", "#000")
.attr("dx", "-.8em")
.attr("dy", "-.55em")
.attr("transform", "rotate(-50)" );
// add the y Axis
svg.append("g")
.call(d3.axisLeft(y));
// add y-axis label
svg.append("text")
.attr("text-anchor", "middle") // this makes it easy to centre the text as the transform is applied to the anchor
.attr("transform", "translate("+ (-margin.left/2) +","+(height/2)+")rotate(-90)") // text is drawn off the screen top left, move down and out and rotate
.text("Hours");
//});
$('#expandbtn').click(function (e) {
$("#container").css("height","100%");
$('#box').addClass('panel-fullscreen show');
$('#compressbtn').removeClass("hide").addClass("show");
$('#expandbtn').removeClass("show").addClass("hide");
});
$('#compressbtn').click(function (e) {
$("#container").css("height","480px");
$('#box').removeClass('panel-fullscreen');
$('#expandbtn').removeClass("hide").addClass("show");
$('#compressbtn').removeClass("show").addClass("hide");
});
I have also added two buttons, on clicking expand button the chart will be displayed in full screen mode and on clicking compress button, chart will be back in normal size. Don't know if that has affected the display of x-axis labels. How can I make the long labels view-able?
Change your svg viewBox attribuite to 0 0 550 550.
The first two values are the X and Y coordinates of the upper left corner of the displayed area, the last two are the width and height. viewBox is set only by attribute.
How it works
Also check what is preserveAspectRatio values and how they work

D3 Line chart - Render Queue

Can we render a D3 line chart using Render Queue?http://bl.ocks.org/syntagmatic/raw/3341641/
I have a JSON with around 50,000 elements in it. My browser crashes when I try to draw a graph with this much amount of data.
Code is:
function lineChart(data, id){
// Set the dimensions of the canvas / graph
var margin = {top: 30, right: 20, bottom: 30, left: 50},
width = 1000 - margin.left - margin.right,
height = 370 - margin.top - margin.bottom;
// Parse the date / time
var parseDate = d3.time.format("%d-%b-%y").parse;
// Define the div for the tooltip
var div = d3.select("body").append("div")
.attr("class", "tooltip")
.style("opacity", 0);
// Set the ranges
var x = d3.time.scale().range([0, width]);
var y = d3.scale.linear().range([height, 0]);
// Define the axes
var xAxis = d3.svg.axis().scale(x)
.orient("bottom").ticks(5);
var yAxis = d3.svg.axis().scale(y)
.orient("left").ticks(5);
// Define the line
var valueline = d3.svg.line()
.x(function(d) { return x(d.time); })
.y(function(d) { return y(d.loadaverage); })
// Adds the svg canvas
var svg = d3.select(id)
.append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform",
"translate(" + margin.left + "," + margin.top + ")");
// Scale the range of the data
x.domain(d3.extent(data, function(d) { return d.time; }));
y.domain([0, d3.max(data, function(d) { return d.loadaverage; })]);
// Add the valueline path.
svg.selectAll('path')
.data(pos)
.enter()
.append("path")
.attr("class", "line")
.attr("d", valueline(data))
.on("mouseover", function(d) {
div.transition()
.duration(200)
.style("opacity", .9);
div.html(d.time + "<br/>" + d.loadaverage)
.style("left", (d3.event.pageX) + "px")
.style("top", (d3.event.pageY - 28) + "px");
})
.on("mouseout", function(d) {
div.transition()
.duration(500)
.style("opacity", 0);
});
// Add the X Axis
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
// Add the Y Axis
svg.append("g")
.attr("class", "y axis")
.call(yAxis);
}
Render Queue uses canvas, which, with 50k elements, you probably should use too. Unfortunately, d3 v3 doesnt support canvas. If you can upgrade to v4, then you will gain canvas support and much greater performance. Conceptually, you certainly can do progressive rendering with lines, but I do not know if Render Queue directly supports it. We ultimately rolled our own progressive renderer for our product.
Be forewarned, if you do switch over to canvas, you'll have to rethink how you are doing your mouseevents because on canvas, you dont have elements onto which you can attach listeners.

Programmatically change initial pan state d3 v4

I define a zoom function:
var zoom = d3.zoom().on("zoom", function () {
svg.attr('transform', d3.event.transform);
});
and call it on this svg variable:
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height)
.call(zoom)
.append("g")
.attr("transform", "translate("
+ width/10 + "," + height/2 + ")");
(where width and height happen to be the size of the screen).
This works great, except for the first time the user zooms. The zoom state is still at the origin, as opposed to the width/10 and height/2 translation.
How do I change the zoom state programmatically to fix this?
Just after writing this I found a very helpful answer here
What worked for me was this:
d3.select('svg').call(zoom.translateBy, width/10, height/2);

d3.js - adding zoom and pan prevents dragging nodes

I've added zoom capabilities to my graph with the following code (snippets):
zoomed = () => {
svg.attr("transform", "translate(" + d3.event.translate + ")scale(" + d3.event.scale + ")");
};
zoom = d3.behavior.zoom()
.scaleExtent([0.3, 1.5])
.on("zoom", zoomed);
svg = d3.select("body")
.append("svg:svg")
.attr("width", width)
.attr("height", height)
.call(zoom)
.append('svg:g');
This works as expected. I can zoom or pan the entire graph. However, I can no longer effect the position of a node because any "click" triggers panning.
My dragging is defined as follows:
dragStart = function(d) {
d.fixed = true;
};
drag = d3.drag()
.on("dragstart", dragStart);
node = svg.selectAll(".node")
.data(graph.nodes)
.enter()
.append("rect")
.attr("class", "node")
.attr("width", function (d) { return d.width - 2 * pad; })
.attr("height", function (d) { return d.height - 2 * pad; })
.attr("rx", 5).attr("ry", 5)
.call(drag);
I'm not sure what I'm doing wrong but my implementation aligns with all the examples I could find with similar functionality. Any help would be appreciated.
I ended up disabling panning to make it work by disabling click events on zoom:
selection.call(zoom)
.on("mousedown.zoom", null)

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