I am trying to pass a parameter when I click on a pie slice, that was created using the D3 library, with the following code to a Filemaker database script. The dataset is in an Array of Objects format.
var dataset = [{key: 1, amt: 5}, {key: 2, amt: 10}, {key: 3, amt: 20}];
I can can put a constant in place of d.amt and pass the constant to Filemaker.
I initially was drawing the pie chart using an array format and the onclick worked fine using, d.value.
Is d.amt the correct syntax to use to pass the parameter for the Array of Objects data format?
var arcs = svg.selectAll("g.arc")
.data(pie(dataset))
.enter()
.append("g")
.attr("class", "arc")
.attr("transform", "translate(" + outerRadius + "," + outerRadius + ")")
.attr("onclick", function(d, i){
return "location.href='" + script + "¶m=" + d.amt + "'";
});
Adding the .on("click", function(d, i) {.. the pie chart did not plot. For the location.href = you have "script¶m=" + d.amt; I need it to be '" + script + "¶m=" + d.amt + "'"; in case it makes a difference.
This is what I have;
...
.attr("transform", "translate(" + outerRadius + "," + outerRadius + ")")
.on("click", function(d, i) {
location.href ="script¶m=" + d.amt;
};
d3's on function serves the purpose better:
svg.selectAll("g.arc)
...
.on("click", function(d, i) {
location.href = script + "¶m=" + d.amt;
});
attr sets the target statically, while creating the elements. on determines the target dynamically, when the click occurs.
Apart from that, d.amt is correct, and I'd also expect your attr variant to work.
I am attempting to use d3.js to move a point along an arc from 0 to PI, say, without the point moving back along the innerRadius as seen here http://bl.ocks.org/mbostock/1705868.
I removed innerRadius hoping (unsuccessfully) that would work (http://jsfiddle.net/klin/23c5476v/). I had also tried setting the innerRadius with the same value as outerRadius.
Fragment I changed (changes marked with //) ...
var path = svg.append("svg:path")
.datum({endAngle: Math.PI}) //
.attr("d", d3.svg.arc()
// .innerRadius(h / 4) // Hoping removal would prevent inner transition
.outerRadius(h / 3)
.startAngle(0)
);//.endAngle(Math.PI));
Entire code ...
var svg = d3.select("body").append("svg:svg")
.attr("width", w)
.attr("height", h)
.append("svg:g")
.attr("transform", "translate(" + w / 2 + "," + h / 2 + ")");
var path = svg.append("svg:path")
.datum({endAngle: Math.PI}) //
.attr("d", d3.svg.arc()
// .innerRadius(h / 4) // Hoping removal would prevent inner transition
.outerRadius(h / 3)
.startAngle(0)
);//.endAngle(Math.PI));
var circle = svg.append("svg:circle")
.attr("r", 6.5)
.attr("transform", "translate(0," + -h / 3 + ")");
function transition() {
circle.transition()
.duration(5000)
.attrTween("transform", translateAlong(path.node()))
.each("end", transition);
}
transition();
// Returns an attrTween for translating along the specified path element.
function translateAlong(path) {
var l = path.getTotalLength();
return function(d, i, a) {
return function(t) {
var p = path.getPointAtLength(t * l);
return "translate(" + p.x + "," + p.y + ")";
};
};
}
The problem I think is that the arc shape has area, so the path must be closed, while the line shape does not. Eventually I'd like to be able to separately animate object movement along a series of consecutive arcs similar to the answer to Interpolating along consecutive paths with D3.js, but first I need to avoid the loop back movement.
Is a simple solution maybe to not use d3's arc generator, but instead use another where the end point actually is the terminus of the path?
Paul is right.
You can do next
var arc = d3.svg.arc(); //plus params
$path.attr('d',function(){
var d = arc();
return d.split('L')[0]; //will return half of arc without lines
});
I'm new to D3 and I'm using this template (http://bl.ocks.org/mbostock/1153292) to visualize my graph. However, my nodes' labels are shore and I want to place them inside circles not on their right hand-side.
Can anybody help me with that?
Thanks a lot
Append circle and text inside a group element and use text-achor property to align the text to the middle.
var nodes = svg.selectAll(".node")
.data(force.nodes())
.enter()
.append("g")
.attr("class","node")
.call(force.drag);
var circles = nodes.append("circle")
.attr("r", 6);
var texts = nodes.append("text")
.attr("text-anchor", "middle")
.text(function(d) {
return d.name;
});
Change tick function as shown below.
function tick() {
path.attr("d", linkArc);
nodes.attr("transform", transform);
}
Update
JSFiddle 1 for aligning text to the center.
If you would like enclose the text label within the circle, increase the radius of circle using the length of name property. Note that, you will have to update the link target positions this time, to adjust the marker positions relative to the circle radius.
var circles = nodes.append("circle")
.attr("r", function(d){ d.radius = d.name.length*3; return d.radius; }
);
function linkArc(d) {
var tX = d.target.x-d.target.radius,
dx = tX - d.source.x,
dy = d.target.y - d.source.y,
dr = Math.sqrt(dx * dx + dy * dy);
return "M" + d.source.x + "," + d.source.y + "A" + dr + "," + dr + " 0 0,1 " + tX + "," + d.target.y;
}
JSFiddle 2
I'm trying to align a down triangle with a rectangle to make a group that can be used to represent a milestone. Any ideas why this code only shows 2 triangles and how to move them to centre bottom of rectangle or any other methods to achieve the same goal?
http://jsfiddle.net/sjp700/Pej4M/
tri.enter().append("path")
.attr("d", d3.svg.symbol().type("triangle-down"))
.style("fill", "black")
.attr("transform", function (d) { return "translate(" + xRange(d.start) + "," + yRange(d.Duration) + ")"; });
As pointed out in the comments, the reason you're seeing only two rectangles is that some of the data is bound to existing paths. To fix, assign a special class to the symbols that you can select by:
var tri = vis.selectAll("path.tri").data(datar);
For the positioning of the symbols, you need to use the same values you use for the rectangles. The y position needs to be offset by a constant so that the symbols appear at the bottom and the x position by half the duration -- I'm guessing that this is what you really want to show as you're currrently hardcoding everything to length 50.
.attr("transform", function (d) { return "translate(" + (xRange(d.start) + 25) + "," + (yRange(d.start) + 15) + ")"; });
Complete demo here.
I'm using the force layout to represent a directed unweighted network. My inspiration comes from the following example: http://bl.ocks.org/mbostock/1153292
I tried to make nodes of different sizes, but I have a little problem.
The marker used to draw the arrow on each link points to the center of the circle. If the circle is too big it covers completely the arrow.
How can I handle this?
If you will use a <line> instead of <path>, the following should work for you, I have it working in my current solution. It's based on #ɭɘ ɖɵʊɒɼɖ 江戸 solution:
In your tick event listener:
linkElements.attr("x1", function(d) { return d.source.x; })
.attr("y1", function(d) { return d.source.y; })
.attr("x2", function(d) {
return getTargetNodeCircumferencePoint(d)[0];
})
.attr("y2", function(d) {
return getTargetNodeCircumferencePoint(d)[1];
});
function getTargetNodeCircumferencePoint(d){
var t_radius = d.target.nodeWidth/2; // nodeWidth is just a custom attribute I calculate during the creation of the nodes depending on the node width
var dx = d.target.x - d.source.x;
var dy = d.target.y - d.source.y;
var gamma = Math.atan2(dy,dx); // Math.atan2 returns the angle in the correct quadrant as opposed to Math.atan
var tx = d.target.x - (Math.cos(gamma) * t_radius);
var ty = d.target.y - (Math.sin(gamma) * t_radius);
return [tx,ty];
}
I am sure this solution can be modified to accomodate <path> elements, however I haven't tried it.
You can offset the target of the link by the radius of the node, i.e. adjust the code
path.attr("d", function(d) {
var dx = d.target.x - d.source.x,
dy = d.target.y - d.source.y,
dr = Math.sqrt(dx * dx + dy * dy);
return "M" + d.source.x + "," + d.source.y + "A" + dr + "," + dr + " 0 0,1 " + d.target.x + "," + d.target.y;
});
by changing the values of d.target.x and d.target.y to take the radius (which would need to be part of the data, something like d.target.radius) into account. That is, offset the end of the arrow by the circle radius.
At the end I've decided to create a marker for each link (instead of one per class).
This solution has the advantage of defining the offset of each marker, depending on the target node which, in my own case, is refX.
// One marker for link...
svg.append("svg:defs").selectAll("marker")
.data(force.links())
.enter().append("svg:marker")
.attr("id", function(link, idx){ return 'marker-' + idx})
.attr("viewBox", "0 -5 10 10")
.attr("refX", function(link, idx){
return 10 + link.target.size;
})
.attr("refY", 0)
.attr("markerWidth", 6)
.attr("markerHeight", 6)
.attr("orient", "auto")
.append("svg:path")
.attr("d", "M0,-5L10,0L0,5")
.attr("fill", function(link){
if(link.type == 'in')
return "green";
return "blue";
});
Now there is one little problem with the fact that the line is curve. This means that the marker/arrow should be translated not only on the X axis, but also on the Y axis, of a value which probably depends on the ray of the curve...
A bit late to answer, but combining all previous answers, I have come up with a comprehensive solution that works for me in d3 v4, written in TypeScript because Angular (in case you find the lack of global variables curious). Below is a snippet containing the key components to include (because my entire production code is way too long and under NDA). Key ideas are annotated as code comments. The end result looks like this:
First of all, since you have tried to make nodes of different sizes, I will assume you have a radius property inside your nodes data. Let's say it is an array of objects like this:
{
id: input.name,
type: input.type,
radius: input.radius
}
Then markers are appended. Note that the size of each arrow (or marker) is 10, and half of it is 5. You can assign it as a variable like #ɭɘ-ɖɵʊɒɼɖ-江戸 did in his answer, but I am just too lazy.
let marker = svg.append("defs")
.attr("class", "defs")
.selectAll("marker")
// Assign a marker per link, instead of one per class.
.data(links, function (d) { return d.source.id + "-" + d.target.id; });
// Update and exit are omitted.
// Enter
marker = marker
.enter()
.append("marker")
.style("fill", "#000")
// Markers are IDed by link source and target's name.
// Spaces stripped because id can't have spaces.
.attr("id", function (d) { return (d.source.id + "-" + d.target.id).replace(/\s+/g, ''); })
// Since each marker is using the same data as each path, its attributes can similarly be modified.
// Assuming you have a "value" property in each link object, you can manipulate the opacity of a marker just like a path.
.style("opacity", function (d) { return Math.min(d.value, 1); })
.attr("viewBox", "0 -5 10 10")
// refX and refY are set to 0 since we will use the radius property of the target node later on, not here.
.attr("refX", 0)
.attr("refY", 0)
.attr("markerWidth", 5)
.attr("markerHeight", 5)
.attr("orient", "auto")
.append("path")
.attr("d", "M0,-5L10,0L0,5")
.merge(marker);
Then, the path can reference each individual marker with its ID:
let path = svg.append("g")
.attr("class", "paths")
.selectAll("path")
.data(links, function (d) { return d.source.id + "-" + d.target.id; });
// Update and exit are omitted.
// Enter
path = path
.enter()
.append("path")
.attr("class", "enter")
.style("fill", "none")
.style("stroke", "#000")
.style("stroke-opacity", function (d) { return Math.min(d.value, 1); })
// This is how to connect each path to its respective marker
.attr("marker-end", function(d) { return "url(#" + (d.source.id + "-" + d.target.id).replace(/\s+/g, '') + ")"; })
.merge(path);
One optional thing to modify if you want more features: Allow your .on("tick", ticked) listener to receive more variables to test for boundaries. For example, the width and height of the svg.
.on("tick", function () { ticked(node, path, width, height) })
And here is your new ticked function, based on the answer of #ɭɘ-ɖɵʊɒɼɖ-江戸 :
ticked(node, path, width, height) {
node
.attr("transform", function(d){return "translate(" + Math.max(d.radius, Math.min(width - d.radius, d.x)) + "," + Math.max(d.radius, Math.min(height - d.radius, d.y)) + ")"});
path
.attr("d", d => {
let dx = d.target.x - d.source.x,
dy = d.target.y - d.source.y,
dr = Math.sqrt(dx * dx + dy * dy),
gamma = Math.atan2(dy, dx), // Math.atan2 returns the angle in the correct quadrant as opposed to Math.atan
sx = Math.max(d.source.radius, Math.min(width - d.source.radius, d.source.x + (Math.cos(gamma) * d.source.radius) )),
sy = Math.max(d.source.radius, Math.min(height - d.source.radius, d.source.y + (Math.sin(gamma) * d.source.radius) )),
// Recall that 10 is the size of the arrow
tx = Math.max(d.target.radius, Math.min(width - d.target.radius, d.target.x - (Math.cos(gamma) * (d.target.radius + 10)) )),
ty = Math.max(d.target.radius, Math.min(height - d.target.radius, d.target.y - (Math.sin(gamma) * (d.target.radius + 10)) ));
// If you like a tighter curve, you may recalculate dx dy dr:
//dx = tx - sx;
//dy = ty - sy;
//dr = Math.sqrt(dx * dx + dy * dy);
return "M" + sx + "," + sy + "A" + dr + "," + dr + " 0 0,1 " + tx + "," + ty;
});
}
As mentioned by #joshua-comeau, it should be a plus sign when calculating sx and sy.
Here my solution :
First I calculate the angle with horizontal axes of the path (gamma). Then I get the X component (Math.cos(gamma) * radius) and Y component (Math.sin(gamma) * radius) of the radius. Then offset the ends of the path by those components.
function linkArc(d) {
var t_radius = calcRadius(d.target.size);
var s_radius = calcRadius(d.source.size);
var dx = d.target.x - d.source.x;
var dy = d.target.y - d.source.y;
var gamma = Math.atan(dy / dx);
var tx = d.target.x - (Math.cos(gamma) * t_radius);
var ty = d.target.y - (Math.sin(gamma) * t_radius);
var sx = d.source.x - (Math.cos(gamma) * s_radius);
var sy = d.source.y - (Math.sin(gamma) * s_radius);
return "M" + sx + "," + sy + "L" + tx + "," + ty;
}
First you will notice I am not using arcs but the principle should be the same.
Also my nodes have a size property from which I calculate the diameter of the circle.
Finally my marker is defined as is:
var arrowsize = 10;
var asHalf = arrowsize / 2;
svg.append("defs").selectAll("marker")
.data(["arrowhead"])
.enter().append("marker")
.attr("id", function (d) {
return d;
})
.attr("viewBox", "0 -5 " + arrowsize + " " + arrowsize)
.attr("refX", arrowsize)
.attr("refY", 0)
.attr("markerWidth", 9)
.attr("markerHeight", 9)
.attr("orient", "auto")
.attr("class", "arrowhead-light")
.append("path")
.attr("d", "M 0," + (asHalf * -1) + " L " + arrowsize + ",0 L 0," + asHalf);
I haven't found a way to control every single copy of the marker.