consolidate successive translations in D3 - d3.js

The following toy code (jsfiddle here) write to the console log translate(20,0) translate(20,0) translate(20,0) translate(20,0) translate(20,0).
Is it possible to get translate(100,0) as a "consolidated" translation?
var svg = d3.select('svg');
var rec=svg.append("rect")
.attr("width",20)
.attr("height", 20)
.attr("x", 0)
.attr("y", 20)
.attr("fill","#00ffff")
.attr("transform","")
;
for (var i=0;i<10;i++) {
rec
.attr("transform",rec.attr("transform")+" translate(20,0)")
;
}
console.log(rec.attr("transform"))

First of all, I believe you want to get translate(200,0) as the result, not translate(100,0), since there are 10 loops.
That being said, you have to get the translate values and add 20 to the first one and 0 to the second one. Otherwise you'll just concatenate strings, as you are doing right now.
Unfortunately there is no native method in D3 v4/v5 to get the transform value, so I'll use the function provided in this answer, with a slight modification (the if conditional), since your first value is an empty string (""):
function getTranslation(transform) {
if (transform === "") {
return [0, 0]
};
var g = document.createElementNS("http://www.w3.org/2000/svg", "g");
g.setAttributeNS(null, "transform", transform);
var matrix = g.transform.baseVal.consolidate().matrix;
return [matrix.e, matrix.f];
}
So, all you need is to get the current translate and add the value you want in your for loop:
for (var i = 0; i < 10; i++) {
var currentTransform = getTranslation(rec.attr("transform"));
rec.attr("transform", "translate(" + (currentTransform[0] + 20) + ",0)");
}
Here is the demo:
var svg = d3.select('svg');
var rec = svg.append("rect")
.attr("width", 20)
.attr("height", 20)
.attr("x", 0)
.attr("y", 20)
.attr("fill", "#00ffff")
.attr("transform", "");
for (var i = 0; i < 10; i++) {
var currentTransform = getTranslation(rec.attr("transform"));
rec.attr("transform", "translate(" + (currentTransform[0] + 20) + ",0)");
}
console.log(rec.attr("transform"))
function getTranslation(transform) {
if (transform === "") {
return [0, 0]
};
var g = document.createElementNS("http://www.w3.org/2000/svg", "g");
g.setAttributeNS(null, "transform", transform);
var matrix = g.transform.baseVal.consolidate().matrix;
return [matrix.e, matrix.f];
}
<script src="https://d3js.org/d3.v5.min.js"></script>
<svg></svg>

Related

how to put dynamic data text inside rectangle in d3

Update method : Thanks in advance. I am creating rectangles based on the api response data. The rectangles will will be removed and re-created when the new data come back from api. I want to achieve same thing for adding text inside the rectangles, means as soon as I receive the fresh data text should be overrided or re-created based on the data.
/* update selection*/
var rectangles = vis.ganttSvgRef.selectAll("rect").data(chartData);
/*exit selection*/
rectangles.exit().remove();
/*enter selection*/
var innerRects = rectangles.enter().append("rect").merge(rectangles)
.attr("x", function (d) {
return vis.timeScale(parseTime(d.arrivalTime_data)) + sidePadding;
})
.attr("y", function (d, i) {
for (var j = 0; j < slotNumber.length; j++) {
if (d.slot == slotNumber[j]) {
return vis.yScale(d.slot);
}
}
})
.attr("width", function (d) {
return (vis.timeScale(parseTime(d.departureTime_data)) -
vis.timeScale(parseTime(d.arrivalTime_data)));
})
.attr("height", barHeight)
.attr("stroke", "none")
.attr("fill", function (d) {
for (var i = 0; i < vesselsNames.length; i++) {
return serviceColorSelector[d.serviceName_data]
}
})
how to add the text in the rectangles in middle, which should also get update based on the data receive. Thanks
Updated code as suggested by #Michael Rovinsky : This code works perfectly fine for appending the text inside the rect, but on few rect the text is overflowing outside the rect area. I don't want to show the text if it overflow from rect area or how can i hide the text if it overflow from rect area ?
var rectangles = vis.ganttSvgRef.selectAll("rect")
.data(chartData);
rectangles.exit().remove();
var innerRects = rectangles.enter().append("g");
let rectinst = innerRects.append("rect").merge(rectangles)
.attr("x", function (d) {
return vis.timeScale(parseTime(d.arrivalTime_data)) +
sidePadding;
})
.attr("y", function (d, i) {
for (var j = 0; j < slotNumber.length; j++) {
if (d.slot == slotNumber[j]) {
return vis.yScale(d.slot);
}
}
})
.attr("width", function (d) {
return (vis.timeScale(parseTime(d.departureTime_data)) -
vis.timeScale(parseTime(d.arrivalTime_data)));
})
.attr("height", barHeight)
.attr("stroke", "none")
.attr("fill", function (d) {
for (var i = 0; i < vesselsNames.length; i++) {
return serviceColorSelector[d.serviceName_data]
}
})
let text = vis.ganttSvgRef.selectAll(".rect-text")
.data(chartData);
text.exit().remove();
innerRects.append("text").merge(text)
.attr("class", 'rect-text')
.text(function (d) {
let rectWidth = (vis.timeScale(parseTime(d.departureTime_data)) -
vis.timeScale(parseTime(d.arrivalTime_data)));
console.log("rect width : ", rectWidth)
console.log("d.vesselName_data : ",
vis.timeScale(d.vesselName_data.length))
return d.vesselName_data;
})
.attr("x", function (d) {
return (vis.timeScale(parseTime(d.departureTime_data)) -
vis.timeScale(parseTime(d.arrivalTime_data))) / 2 +
vis.timeScale(parseTime(d.arrivalTime_data)) + sidePadding;
})
.attr("y", function (d, i) {
for (var j = 0; j < slotNumber.length; j++) {
if (d.slot == slotNumber[j]) {
return vis.yScale(d.slot) + (barHeight / 2);
}
}
})
.attr("font-size", barHeight / 2)
.attr("text-anchor", "middle")
.attr("text-height", barHeight)
.attr("fill", '#fff');
Append "g" instead of "rect" on enter():
const containers = rectangles.enter().append("g");
Append "rect" and "text" under "g":
containers.append("rect").attr('width', ...).attr('height', ...)...
containers.append("text").text('My Text Here')...
You can write your own text wrapping function d3 based on the rect dimensions and given padding.
Please check following link for customised text wrapping and overflow control in d3.js-
Code- text-wrapping-in-d3
function wrap(text) {
text.each(function() {
var text = d3.select(this);
var words = text.text().split(/\s+/).reverse();
var lineHeight = 20;
var width = parseFloat(text.attr('width'));
var y = parseFloat(text.attr('y'));
var x = text.attr('x');
var anchor = text.attr('text-anchor');
var tspan = text.text(null).append('tspan').attr('x', x).attr('y', y).attr('text-anchor', anchor);
var lineNumber = 0;
var line = [];
var word = words.pop();
while (word) {
line.push(word);
tspan.text(line.join(' '));
if (tspan.node().getComputedTextLength() > width) {
lineNumber += 1;
line.pop();
tspan.text(line.join(' '));
line = [word];
tspan = text.append('tspan').attr('x', x).attr('y', y + lineNumber * lineHeight).attr('anchor', anchor).text(word);
}
word = words.pop();
}
});
}
function dotme(text) {
text.each(function() {
var text = d3.select(this);
var words = text.text().split(/\s+/);
var ellipsis = text.text('').append('tspan').attr('class', 'elip').text('...');
var width = parseFloat(text.attr('width')) - ellipsis.node().getComputedTextLength();
var numWords = words.length;
var tspan = text.insert('tspan', ':first-child').text(words.join(' '));
// Try the whole line
// While it's too long, and we have words left, keep removing words
while (tspan.node().getComputedTextLength() > width && words.length) {
words.pop();
tspan.text(words.join(' '));
}
if (words.length === numWords) {
ellipsis.remove();
}
});
}
d3.selectAll('.wrapme').call(wrap);
d3.selectAll('.dotme').call(dotme);

d3js enter, update, exit confusion: need assistance please

I genuinely hate to ask this question, particularly as I know it has been asked dozens of times - and I've read through the posts. But my problem remains - I simply do not understand how this mechanism works. I am new to d3js, and am using v3.x in meteor; I've gone through tutorials and have gotten something working, but can't get it to update with new data. Again, my apologies for rehashing this, but none of the other posts I've read has resolved the issue.
Here is a code fragment, I've stripped out all the stuff that shouldn't make a difference to focus on the core functionality:
var w = 800;
var h = 800;
var intensity = 25;
var margin = {
top: 75,
right: 100,
bottom: 75,
left: 60
};
var svg = d3.select('#heatmap')
.append('svg')
.attr('width', w + margin.left + margin.right)
.attr('height', h + margin.top + margin.bottom)
.append('g')
.attr('transform', 'translate(' + margin.left + ',' + margin.top + ')');
// get csv data, x & y coords, etc...
createHeatmap = function(csv, x, y) {
var data = d3.csv.parseRows(csv).map(function(row) {
return row.map(function(d) {
return +d;
});
});
// set some values
var min = 0;
var max = d3.max(data, function(d, i) {
return i + 1;
});
var rectSize = 4;
// set the scales for both axes
...
// set up the axes
...
// define colorScale
...
// create heatmap
svg.selectAll('g')
.data(data)
.enter()
.append('g')
.selectAll('rect')
.data(function(d, i, j) {
return d;
})
.enter() // start drawing rects
.append('rect')
.attr('x', function(d, i, j) {
return (i * rectSize);
})
.attr('y', function(d, i, j) {
return (j * rectSize);
})
.attr('width', w / max)
.attr('height', h / max)
.style('fill', function(d, i, j) {
return colorScale(d * intensity);
});
// append axes, scales, labels, etc.
}
// create heatmap
createHeatmap(csv, x, y);
My problem is that I do not understand why the chart doesn't update the heatmap when I pass new data into createHeatmap().
I stepped through it in the debugger and everything works as I would expect during the initial creation of the heatmap, which renders correctly. When I send new data is when the mystery starts. The debugger shows, deep within d3js itself (not in my code) that the enter() has an array full od null values instead of the data I am passing in. The data exists up until that point. So, as d3js processes the null data it naturally returns an empty object so no update occurs.
Obviously I am not doing the update correctly but am clueless about what I need to do to correct it.
Any advise is greatly appreciated.
Thx!
Update:
Andrew, thanks for the response. I tried your first suggestion, modifying your example to fit my data, but it doesn't update with new data.
My changes:
var w = 800;
var h = 800;
var intensity = 25;
var margin = {
top: 75,
right: 100,
bottom: 75,
left: 60
};
var svg = d3.select('#heatmap')
.append('svg')
.attr('width', w + margin.left + margin.right)
.attr('height', h + margin.top + margin.bottom)
.append('g')
.attr('transform', 'translate(' + margin.left + ',' + margin.top + ')');
// get csv data, x & y coords, etc...
createHeatmap = function(csv, x, y) {
var data = d3.csv.parseRows(csv).map(function(row) {
return row.map(function(d) {
return +d;
});
});
// set some values
var min = 0;
var max = d3.max(data, function(d, i) {
return i + 1;
});
var rectSize = 4;
// set the scales for both axes
...
// set up the axes
...
// define colorScale
...
// append group of svg elements bound to data
var rows = svg.selectAll('g')
.data(data);
// enter new rows where needed
rows.enter().append('g');
// select all rects
var rects = rows.selectAll('rect')
.data(function(d, i, j) {
return d;
});
// enter new rects:
rects.enter().append('rect')
.attr('x', function(d, i, j) {
return (i * rectSize);
})
.attr('y', function(d, i, j) {
return (j * rectSize);
})
.attr('width', w / max)
.attr('height', h / max)
.style('fill', function(d, i, j) {
return colorScale(d * intensity);
});
Added snippet:
var csv = "'3, 6, 0, 8'\n'1, 9, 0, 4'\n'3, 0, 1, 8'\n'4, 0, 2, 7";
csv = csv.replace(/'/g,'');
var button = d3.select('button')
.on('click', function() {
createHeatmap(update());
});
var w = 120;
var h = 120;
var intensity = 10;
var margin = {
top: 25,
right: 25,
bottom: 25,
left: 25
};
var svg = d3.select('#heatmap')
.append('svg')
.attr('width', w + margin.left + margin.right)
.attr('height', h + margin.top + margin.bottom)
.append('g')
.attr('transform', 'translate(' + margin.left + ',' + margin.top + ')');
createHeatmap(csv);
function createHeatmap(csv) {
console.log(csv);
var data = d3.csv.parseRows(csv).map(function(row) {
return row.map(function(d) {
return +d;
});
});
var min = 0;
var max = d3.max(data, function(d, i) {
return i + 1;
});
var rectSize = 30;
// define a colorScale with domain and color range
var colorScale = d3.scale.linear()
.domain([0,0.5,1])
.range(['red', 'green', 'blue']);
// append group of svg elements bound to data
var rows = svg.selectAll('g')
.data(data);
// enter new rows where needed
rows.enter().append('g');
// select all rects
var rects = rows.selectAll('rect')
.data(function(d, i, j) {
return d;
});
// enter new rects:
rects.enter().append('rect')
.attr('x', function(d, i, j) {
return (i * rectSize);
})
.attr('y', function(d, i, j) {
return (j * rectSize);
})
.attr('width', w / max)
.attr('height', h / max)
.style('fill', function(d, i, j) {
return colorScale(d * intensity);
});
}
function update() {
var data = "'0, 1, 9, 5'\n'4, 0, 7, 2'\n'6, 3, 0, 8'\n'5, 3, 7, 0";
data = data.replace(/'/g,'');
return data;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.17/d3.min.js"></script>
<button>Update</button>
<div id="heatmap"></div>
The issue is in your method chaining.
On first run, things should run as expected:
// create heatmap
svg.selectAll('g') // 1. select all g elements
.data(data) // 2. assign data
.enter() // 3. enter and append a g for each item in the data array
.append('g') // that doesn't have a corresponding element in the DOM (or more accurately, the selection)
.selectAll('rect') // 4. For each newly entered g, select child rectangles
.data(function(d, i, j) { // 5. assign data to child selection.
return d;
})
.enter() // 6. Enter and append a rect for each item in the child g's data array
.append("rect") // that doesn't have a corresponding element in the DOM.
.... // 7. Style
On that first run, we select all the gs, there are none, so the enter selection will have an element for each item in the data array: we are entering everything. Same as with the child rectangles: there are no child rectangles existing when you make the selection, so you enter everything in the child data array.
On the second run, with svg.selectAll("g"), you select all the gs you created the first time around - there is no need to enter anything if the data array has the same number of items. You don't want to append anything: enter().append() the second time (not that you are appending more elements with .append() in any event).
Essentially on the second pass you are modifying an empty selection.
Instead you want to update. While the enter selection is empty on the second pass, the update selection has all the existing gs.
There are a few methods to do this, one is to break your chaining:
This is a version 3 solution:
var rows = svg.selectAll("g")
.data(data);
// enter new rows where needed
rows.enter().append("g")
// Select all rects
var rects = rows.selectAll("rect")
.data(function(d) { return d; })
// Enter new rects:
rects.enter().append("rect")
// Update rects (all rects, not just the newly entered):
rects.attr()...
The below snippet uses this pattern, it enters new rects and gs as needed. And then updates all the rects and gs afterwards. This takes advantage of a magic in d3v3, where the update selection and the enter selection are merged internally, this is not the case in d3v4,v5, which I'll show below.
var button = d3.select("button")
.on("click", function() {
update(random());
})
var svg = d3.select("div")
.append("svg");
var color = d3.scale.linear()
.domain([0,0.5,1])
.range(["red","orange","yellow"])
update(random());
function update(data) {
var rows = svg.selectAll("g")
.data(data);
// enter new rows where needed
rows.enter()
.append("g")
.attr("transform", function(d,i) {
return "translate("+[0,i*22]+")";
})
// Select all rects:
var rects = rows.selectAll("rect")
.data(function(d) { return d; })
// Enter new rects:
rects.enter().append("rect")
// Update rects:
rects.attr("fill", function(d) {
return color(d);
})
.attr("x", function(d,i) { return i*22; })
.attr("width", 20)
.attr("height", 20);
console.log("entered rows:" + rows.enter().size());
console.log("entered rects:" + rects.enter().size());
}
function random() {
return d3.range(5).map(function() {
return d3.range(5).map(function() {
return Math.random();
})
})
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.17/d3.min.js"></script>
<button>Update</button>
<div></div>
v4/v5:
For v4/v5, which I suggest upgrading to, the pattern is a bit different as you have to explicitly merge the enter and update selections:
var button = d3.select("button")
.on("click", function() {
update(random());
})
var svg = d3.select("div")
.append("svg");
var color = d3.scaleLinear()
.domain([0,0.5,1])
.range(["red","orange","yellow"])
update(random());
function update(data) {
var rows = svg.selectAll("g")
.data(data);
// enter new rows where needed
rows = rows.enter()
.append("g")
.merge(rows) // merge with existing rows
.attr("transform", function(d,i) {
return "translate("+[0,i*22]+")";
})
// Select all rects:
var rects = rows.selectAll("rect")
.data(function(d) { return d; })
// Enter new rects:
rects = rects.enter().append("rect")
.merge(rects);
// Update rects:
rects.attr("fill", function(d) {
return color(d);
})
.attr("x", function(d,i) { return i*22; })
.attr("width", 20)
.attr("height", 20);
}
function random() {
return d3.range(5).map(function() {
return d3.range(5).map(function() {
return Math.random();
})
})
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.7.0/d3.min.js"></script>
<button>Update</button>
<div></div>
Update
Your snippet almost incorporates the changes, but you still need to break up the second selection, that of the rectangles, so that you enter new rectangles and then update all of them:
var csv = "'3, 6, 0, 8'\n'1, 9, 0, 4'\n'3, 0, 1, 8'\n'4, 0, 2, 7";
csv = csv.replace(/'/g,'');
var button = d3.select('button')
.on('click', function() {
createHeatmap(update());
});
var w = 120;
var h = 120;
var intensity = 10;
var margin = {
top: 25,
right: 25,
bottom: 25,
left: 25
};
var svg = d3.select('#heatmap')
.append('svg')
.attr('width', w + margin.left + margin.right)
.attr('height', h + margin.top + margin.bottom)
.append('g')
.attr('transform', 'translate(' + margin.left + ',' + margin.top + ')');
createHeatmap(csv);
function createHeatmap(csv) {
console.log(csv);
var data = d3.csv.parseRows(csv).map(function(row) {
return row.map(function(d) {
return +d;
});
});
var min = 0;
var max = d3.max(data, function(d, i) {
return i + 1;
});
var rectSize = 30;
// define a colorScale with domain and color range
var colorScale = d3.scale.linear()
.domain([0,0.5,1])
.range(['red', 'green', 'blue']);
// append group of svg elements bound to data
var rows = svg.selectAll('g')
.data(data);
// enter new rows where needed
rows.enter().append('g');
// select all rects
var rects = rows.selectAll('rect')
.data(function(d, i, j) {
return d;
});
// enter new rects:
rects.enter().append('rect');
// CHANGES HERE:
// Broke chain so that update actions aren't carried out on the enter selection:
rects.attr('x', function(d, i, j) {
return (i * rectSize);
})
.attr('y', function(d, i, j) {
return (j * rectSize);
})
.attr('width', w / max)
.attr('height', h / max)
.style('fill', function(d, i, j) {
return colorScale(d * intensity);
});
}
function update() {
var data = "'0, 1, 9, 5'\n'4, 0, 7, 2'\n'6, 3, 0, 8'\n'5, 3, 7, 0";
data = data.replace(/'/g,'');
return data;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.17/d3.min.js"></script>
<button>Update</button>
<div id="heatmap"></div>

Making different size of `radius` to create `arc` not working

I am creating pie chart using d3.js. I would like to create 3 pies with single svg element with animation.
This is working fine for me. But do creating different I am reducing the radius each time using a loop. But the radius not getting changed.
How to solve this?
my code (sample) :
var array1 = [
0,200
]
window.onload = function () {
var width = 660,
height = 200,
radius = Math.min(width, height) / 2;
var color = d3.scale.category20();
var arc = null;
var pie = d3.layout.pie()
.value(function(d) {
return d; })
.sort(null);
function tweenPie(finish) {
var start = {
startAngle: 0,
endAngle: 0
};
var i = d3.interpolate(start, finish);
return function(d) { return arc(i(d)); };
}
var svg1 = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
for( var i = 0; i < 3; i++) {
arc = d3.svg.arc()
.innerRadius(radius - (5*i)) //each time size differs
.outerRadius(radius - (6)*i); //each time size differs
svg1.append('g')
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")")
.datum(array1).selectAll("path")
.data(pie)
.enter().append("path")
.attr("fill", function(d, i) { return color(i); })
.transition()
.duration(5000)
.attrTween('d', tweenPie)
}
}
Live Demo
There is a single arc variable that is being used in the tweenPie method and in the for loop. Each time through the for loop, the arc variable is set to a new value. The tweenPie method is called for each pie chart after the for loop exits. As a result, all the pie charts are using the same tweenPie method which is using the arc created in the last for loop.
For each pie chart, you need to create a separate tweenPie method with its own arc. For example...
var array1 = [ 0, 200 ]
window.onload = function () {
var width = 660,
height = 200,
radius = Math.min(width, height) / 2;
var color = d3.scale.category20();
var arc = null;
var pie = d3.layout.pie()
.value(function(d) {
return d; })
.sort(null);
function getTweenPie(arc) {
return function (finish) {
var start = {
startAngle: 0,
endAngle: 0
};
var i = d3.interpolate(start, finish);
return function(d) { return arc(i(d)); };
}
}
var svg1 = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
for( var i = 0; i < 3; i++) {
arc = d3.svg.arc()
.innerRadius(radius - (5*i)) //each time size differs
.outerRadius(radius - (6)*i); //each time size differs
svg1.append('g')
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")")
.datum(array1).selectAll("path")
.data(pie)
.enter().append("path")
.attr("fill", function(d, i) { return color(i); })
.transition()
.duration(5000)
.attrTween('d', getTweenPie(arc))
}
}

Not able to add the fill between the paths. using d3js

i am trying to fill the background between 2 lines, but i am not getting any correct output.
and i would like to remove the tick line in the y axis as well. how to get this both?
here is my code : any one correct me please?
$(function(){
var m = [80, 80, 80, 80]; // margins
var w = 300; // width
var h = 450; // height
var plan = 55;
var actual = 38;
var variation = plan - actual;
var data = [0,plan];
var data1 = [0,actual];
var x = d3.scale.linear().domain([0, 2]).range([0, w]);
var y = d3.scale.linear().domain([0, 100]).range([h, 0]);
var line = d3.svg.line()
.x(function(d,i) {
return x(i);
})
.y(function(d) {
return y(d);
})
var graph = d3.select("#graph").append("svg:svg")
.attr("width", w + m[1] + m[3])
.attr("height", h + m[0] + m[2])
.append("svg:g")
.attr("transform", "translate(" + m[3] + "," + m[0] + ")");
var yAxisLeft = d3.svg.axis().scale(y).tickSize(-w).orient("left");
graph.append("svg:g")
.attr("class", "y axis")
.attr("transform", "translate(-0,0)")
.call(yAxisLeft);
graph.append("svg:path").attr("d", line(data));
graph.append("svg:path").attr("d", line(data1));
//not able to fill the bg between 2 lines
var area = d3.svg.area()
.x(function(d, i) { return 0 })
.x1(function(d, i) { return plan })
.y0(function(d, i) { return y(actual); })
.y1(function(d, i) { return y(variation); })
.interpolate("basis");
graph.append("path")
.datum(data)
.attr("d", area)
.attr("fill", "#CCC");
});
Live Demo
Concerning your area :
var area = d3.svg.area()
.x(function(d, i) { return 0 })
.x1(function(d, i) { return plan })
.y0(function(d, i) { return y(actual); })
.y1(function(d, i) { return y(variation); })
.interpolate("basis");
x and x1 are returning static values, so it won't draw an area but just a line
your both lines have same x axis so you just have to specify .x()
y0 and y1 are also returnin static values
Here is a working version :
var area = d3.svg.area()
.x(function(d, i) { return x(i) })
.y0(function(d, i) { return y(data[i]); })
.y1(function(d, i) { return y(data1[i]); })
Also be careful, you have a fill: none; in your css file so you won't see anything.
Functional plunker : http://plnkr.co/edit/xFNF3BQzd0IO5bauAiFU?p=preview

Alternating tick padding in d3.js

I am writing the following d3.js function for brush. This function works fine for me but i want to alternate the tick padding for the brush so that two consecutive ticks are not on the same height and hence do not overlap. This maintains the clarity of the ticks. Can anyone suggest the right way to do so in the following function.
$scope.drawBrush = function (span) {
var width = 400,
height = 50;
var x = d3.time.scale()
.domain([new Date($scope.range1), new Date($scope.range2)])
.range([0, width]);
d3.select('#brushd').remove();
var brush = d3.svg.brush()
.x(x)
.extent([new Date($scope.range1), new Date($scope.range2)])
.on('brush', brushed);
var svg = d3.select('#brush-div').append('svg')
.attr('id', 'brushd')
.attr('width', '400')
.attr('height', '80')
.style('margin-left', '0px')
.append('g')
.attr('transform', 'translate(' + 50 + ',' + 0 + ')');
svg.append('rect')
.attr('class', 'grid-background')
.attr('width', width)
.attr('height', height);
svg.append('g')
.attr('class', 'x grid')
.attr('transform', 'translate(0,' + height + ')')
.call(d3.svg.axis()
.scale(x)
.orient('bottom')
.ticks(d3.time.hours, 12)
.tickSize(-height)
.tickFormat(''))
.selectAll('.tick')
.classed('minor', function (d) {
return d.getHours();
});
svg.append('g')
.attr('class', 'x axis')
.attr('transform', 'translate(0,' + height + ')')
.call(d3.svg.axis()
.scale(x)
.orient('bottom')
.tickFormat(d3.time.format('%b-%y'))
.tickPadding(0))
.selectAll('text')
.attr('x', 6)
.style('text-anchor', null);
var gBrush = svg.append('g')
.attr('class', 'brush')
.call(brush);
gBrush.selectAll('rect')
.attr('height', height);
function brushed() {
var extent0 = brush.extent(),
extent1;
// if dragging, preserve the width of the extent
if (d3.event.mode === 'move') {
var d0 = d3.time.day.round(extent0[0]),
d1 = d3.time.day.offset(d0, Math.round((extent0[1] - extent0[0]) / 864e5));
extent1 = [d0, d1];
}
// otherwise, if resizing, round both dates
else {
if (span === 'daily') {
extent1 = extent0.map(d3.time.day.round);
// if empty when rounded, use floor & ceil instead
if (extent1[0] >= extent1[1]) {
extent1[0] = d3.time.day.floor(extent0[0]);
extent1[1] = d3.time.day.ceil(extent0[1]);
}
} else if (span === 'weekly') {
extent1 = extent0.map(d3.time.week.round);
// if empty when rounded, use floor & ceil instead
if (extent1[0] >= extent1[1]) {
extent1[0] = d3.time.week.floor(extent0[0]);
extent1[1] = d3.time.week.ceil(extent0[1]);
}
} else {
extent1 = extent0.map(d3.time.month.round);
// if empty when rounded, use floor & ceil instead
if (extent1[0] >= extent1[1]) {
extent1[0] = d3.time.month.floor(extent0[0]);
extent1[1] = d3.time.month.ceil(extent0[1]);
}
}
}
d3.select(this).call(brush.extent(extent1));
$scope.getLimit(brush.extent()[0], brush.extent()[1]);
}
};
One way to alternate between long and short ticks on your x-axis, to achieve this sort of thing:
... is like this:
// flag to alternate between long and short ticks
var alternate_ticks = false;
var short_tick_length = 4;
var long_tick_length = 16;
// Alternate the tick line between long and short ticks
d3.selectAll("g.x.axis g.tick line")
.attr("y2", function () {
if (alternate_ticks) {
alternate_ticks = false;
return long_tick_length;
} else {
alternate_ticks = true;
return short_tick_length;
}
});
var alternate_text = false;
// Alternate the tick label text to match up with the tick length
d3.selectAll("g.x.axis g.tick text")
.attr("y", function () {
if (alternate_text) {
alternate_text = false;
return long_tick_length + 1;
} else {
alternate_text = true;
return short_tick_length + 1;
}
});
It's a simpler version of the same approach as Lars K pointed out above, but using a simpler function that just alternates between false and true to determine tick length and text positioning on the relevant set of objects.
Try this for tick labeling.
// Alternate the tick label text to match up with the tick length
d3.selectAll("g.x.axis g.tick text")
.each(function (d, i) {
//console.log(i % 2);
if ((i % 2)) { //even
this.remove();
}
});

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