D3 stop and restart transition along path to allow click through to geo data coordinates
Question
Hi I'm trying to use D3 to pause and resume a transition of a marker along a path like this example D3 tween - pause and resume controls plus stop the marker's transition on a particular data point like this D3 transition along segments of path and pause at coordinate values . I am starting the transition by clicking on the marker and would like to be able to stop it and then restart it when it is clicked – at the moment it pauses for a period and then starts.
I'd like to be able to stop the marker completely so I can do something with the point ie click through to xlink:href for a particular clicked point based on its json data and so leave the page - and then return to the marker transition and resume the transition from the same point it stopped.
I think I need to pass the pauseValues into the transition function but just can't understand how to do this.
This is my code:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<script src="https://d3js.org/d3.v4.min.js"></script>
<style type="text/css">
body {
font-family: "Helvetica Neue", Helvetica, sans-serif;
color: red;
}
circle {
fill: steelblue;
stroke: steelblue;
stroke-width: 3px;
}
.point {
fill: green;
}
.line {
fill: none;
stroke: red;
stroke-width: 4;
stroke-dasharray: 4px, 8px;
}
</style>
<body>
<script>
var width = 960,
height = 500;
var data = [
[610.4199794444444, 243.7191682432953], //Paris
[480, 200],
[580, 400],
[680, 100],
[780, 300],
[180, 300],
[280, 100],
[380, 400]
];
var duration = 20000/data.length,
pauseTime = 2000;
var line = d3.line()
.x(function(d) {
return (d)[0];
})
.y(function(d) {
return (d)[1];
});
var svg = d3.select("body")
.append("svg")
.attr("width", width)
.attr("height", height);
//path to animate - marker transitions along this path
var path = svg.append("path")
.data([data])
.attr("d", line)
.attr('class', 'line')
.attr("d", function(d) {
return line(d)
});
//Want to activate circles when marker paused on them - intention is to have on click to href and stop marker while href is displayed
svg.selectAll("circle")
.data(data)
.enter()
.append("circle")
.attr("class", "point")
.attr("r", 10)
.attr("transform", function(d) {
return "translate(" + d + ")";
})
.on('click', function(d, i) {
d3.select(this)
.style("fill", "pink")
//sample - data will be for each point and based on the geojson in real example
.append("a")
.attr("xlink:href", "http://collections.anmm.gov.au/en/objects/details/11429/")
pausePoints.push(i);
console.log("pausePoints_push_i: " +pausePoints.push(i));
console.log("pausePoints: " + pausePoints);
if (pausePoints.length === 1)
transition();
});
var marker = svg.append("circle")
.attr("r", 19)
.attr("transform", "translate(" + (data[0]) + ")")
.on('click', function(d, i) {
d3.select(this)
.style("fill", "pink")
pausePoints.push(i);
if (pausePoints.length === 1)
setTimeout(function() {
pauseValues.lastTime = pauseValues.currentTime;
}, 100);
transition();
});
var pauseValues = {
lastTime: 0,
currentTime: 0
};
var pausePoints = [],
iter = 0,
transData = data.slice();
function transition() {
marker.transition()
.ease(d3.easeLinear)
.duration(duration - (duration * pauseValues.lastTime))
.attrTween("transform", function(){
var p0 = transData.shift(),
p1 = transData[0];
m = (p0[1] - p1[1]) / (p0[0] - p1[0]),
b = p0[1] - (m * p0[0]),
i = d3.interpolateNumber(p0[0], p1[0]);
return function(t){
//console.log("T: " +t);
var x = i(t),
y = m*x + b;
return "translate(" + x + "," + y + ")";
}
})
.on("end", function(){
if (transData.length <= 1) return;
iter++;
setTimeout(transition, pausePoints.indexOf(iter) !== -1 ? pauseTime : 0);
});
};
</script>
</body>
1 answers
solution1
1 ACCPTED 2017-12-02 16:06:04
I helped you with your last question. From the code I wrote, you introduced this variable pauseValues , what is it intended to do? From what I can tell, it attempts to adjust the duration based on previous pauses; you only needed this when you were running one long transition across all the paths. My code runs each leg as a single transition. If you want to pause and resume on click here's a simple refactor:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <script src="https://d3js.org/d3.v4.min.js"></script> <style type="text/css"> body { font-family: "Helvetica Neue", Helvetica, sans-serif; color: red; } circle { fill: steelblue; stroke: steelblue; stroke-width: 3px; } .point { fill: green; } .line { fill: none; stroke: red; stroke-width: 4; stroke-dasharray: 4px, 8px; } </style> <body> <script> var width = 960, height = 500; var data = [ [610.4199794444444, 243.7191682432953], //Paris [480, 200], [580, 400], [680, 100], [780, 300], [180, 300], [280, 100], [380, 400] ]; var duration = 20000 / data.length, pauseTime = 2000; var line = d3.line() .x(function(d) { return (d)[0]; }) .y(function(d) { return (d)[1]; }); var svg = d3.select("body") .append("svg") .attr("width", width) .attr("height", height); //path to animate - marker transitions along this path var path = svg.append("path") .data([data]) .attr("d", line) .attr('class', 'line') .attr("d", function(d) { return line(d) }); //Want to activate circles when marker paused on them - intention is to have on click to href and stop marker while href is displayed svg.selectAll("circle") .data(data) .enter() .append("circle") .attr("class", "point") .attr("r", 10) .attr("transform", function(d) { return "translate(" + d + ")"; }) .on('click', function(d, i) { d3.select(this) .style("fill", "pink") //sample - data will be for each point and based on the geojson in real example .append("a") .attr("xlink:href", "http://collections.anmm.gov.au/en/objects/details/11429/") pausePoints.push(i); if (pausePoints.length === 1) transition(); }); var marker = svg.append("circle") .attr("r", 19) .attr("transform", "translate(" + (data[0]) + ")") .on('click', function(d, i) { transition(); }); var pausePoints = [], iter = 0; transData = data.slice(); function transition() { marker.transition() .ease(d3.easeLinear) .duration(duration) .attrTween("transform", function() { var p0 = transData.shift(), p1 = transData[0], m = (p0[1] - p1[1]) / (p0[0] - p1[0]), b = p0[1] - (m * p0[0]), interp = d3.interpolateNumber(p0[0], p1[0]); return function(t) { var x = interp(t), y = m * x + b; return "translate(" + x + "," + y + ")"; } }) .on("end", function() { iter++; if ( transData.length <= 1 || // out of points pausePoints.indexOf(iter) !== -1) // on a clicked point { return; } transition(); }); }; </script> </body>
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