I am working on a multi-line scatterplot with zoom using d3 v6. I am new to d3 and based on different examples, I could get the zoom function working for the images/points. The problem is that the lines aren't zooming. I looked at many similar questions, but none of those solutions are working for me.
The code I am using:
var margin = {
top: 50,
right: 30,
bottom: 30,
left: 210,
};
var svg = d3.select("svg"),
width = 1410 - margin.left - margin.right,
height = 620 - margin.top - margin.bottom;
svg
.append("defs")
.append("clipPath")
.attr("id", "clip")
.append("rect")
.attr("width", width)
.attr("height", height);
d3.csv("CSV_files/NSW_pathway.csv").then(function (data1) {
var groupData = d3.group(data1, (d) => d.pathway_name);
var xScale = d3.scaleLinear().domain([0, 1]).range([0, width]);
var yScale = d3.scaleLinear().domain([0, 1]).range([height, 0]);
var xAxis = d3.axisBottom(xScale).ticks(0).tickSize(-height);
var yAxis = d3.axisLeft(yScale).ticks(0).tickSize(-width);
var gX = svg
.append("g")
.attr(
"transform",
"translate(" margin.left "," (margin.top height) ")"
)
.call(xAxis);
var gY = svg
.append("g")
.attr("transform", "translate(" margin.left "," margin.top ")")
.call(yAxis);
var focus = svg
.append("g")
.attr("transform", "translate(" margin.left "," margin.top ")")
.attr("class", "line")
.attr("clip-path", "url(#clip)");
const color = d3
.scaleOrdinal()
.range(["#e41a1c", "#377eb8", "#4daf4a", "#984ea3"]);
var points_g = svg
.append("g")
.attr("transform", "translate(" margin.left "," margin.top ")")
.attr("clip-path", "url(#clip)")
.classed("points_g", true);
var label = svg
.append("g")
.attr("transform", "translate(" margin.left "," margin.top ")")
.attr("class", "label")
.attr("clip-path", "url(#clip)");
var div = d3
.select("body")
.append("div")
.attr("class", "tooltip")
.style("opacity", 0);
const mouseover = function (event, d) {
div.style("opacity", 1);
};
const mousemove = function (event, d) {
div
.html(function (d1) {
if (d.type != "learner")
return `The resource name is ${d.resource_name}`;
else return `This is ${d.name}`;
})
.style("position", "absolute")
.style("left", event.pageX 15 "px")
.style("top", event.pageY 15 "px");
};
const mouseleave = function (event, d) {
div.transition().duration(200).style("opacity", 0);
};
var points = points_g.selectAll("point").data(data1);
points = points
.enter()
.append("image")
.attr("xlink:href", function (d) {
if (d.type == "video") return "Images/3.jpg";
else if (d.type == "pdf") return "Images/4.png";
else if (d.type == "none") return "Images/5.png";
})
.attr("x", function (d) {
return xScale( d.x) - 10;
})
.attr("y", function (d) {
return yScale( d.y) - 10;
})
.attr("width", 20)
.attr("height", 20)
.on("mouseover", mouseover)
.on("mousemove", mousemove)
.on("mouseleave", mouseleave);
label
.selectAll(".text")
.data(data1)
.enter()
.append("text")
.text(function (d) {
return d.topic;
})
.attr("x", function (d) {
return xScale( d.x) 10;
})
.attr("y", function (d) {
return yScale( d.y) 10;
});
focus
.selectAll("line")
.data(groupData)
.enter()
.append("path")
.attr("fill", "none")
.attr("stroke", function (d) {
return color(d[0]);
})
.attr("stroke-width", 1)
.attr("d", function (d) {
return d3
.line()
.curve(d3.curveMonotoneX)
.x(function (d) {
return xScale( d.x);
})
.y(function (d) {
return yScale( d.y);
})(d[1]);
});
var zoom = d3
.zoom()
.scaleExtent([0.5, 20])
.extent([
[0, 0],
[width, height],
])
.on("zoom", zoomed);
svg
.append("rect")
.attr("width", width)
.attr("height", height)
.style("fill", "none")
.attr("transform", "translate(" margin.left "," margin.top ")")
.lower();
svg.call(zoom).call(zoom.transform, d3.zoomIdentity);
function zoomed({ transform }) {
var new_xScale = transform.rescaleX(xScale);
var new_yScale = transform.rescaleY(yScale);
gX.call(xAxis.scale(new_xScale));
gY.call(yAxis.scale(new_yScale));
points
.data(data1)
.attr("x", function (d) {
return new_xScale(d.x) - 10;
})
.attr("y", function (d) {
return new_yScale(d.y) - 10;
});
label
.selectAll("text")
.data(data1)
.attr("x", function (d) {
return new_xScale(d.x) 15;
})
.attr("y", function (d) {
return new_yScale(d.y) 15;
});
focus.selectAll("line").attr("d", function (d) {
return d3
.line()
.curve(d3.curveMonotoneX)
.x(function (d) {
return xScale( d.x);
})
.y(function (d) {
return yScale( d.y);
})(d[1]);
});
}
});
A sample of the csv file:
x,y,name,type,topic,resource_name,pathway_name
0,0,start,none,Sponsored Search Markets,Networks Crowd and Markets_NCMch15.pdf,pathwayOne
0,0,start,none,Sponsored Search Markets,Networks Crowd and Markets_NCMch15.pdf,pathwayTwo
0.086511627906977,0.16,horse,pdf,Graphs,Networks Crowd and Markets_NCMch2.pdf,pathwayOne
0.12,0.283768436578171,choice,pdf,Network Centrality,Notes_CGT BASED network CENTRALITY - L2.pdf,pathwayTwo
0.32,0.27217943628424,plex,video,Network Models,Network Analysis_LNch13.pdf,pathwayOne
0.775398773006135,0.33,social,pdf,Clustering,Network Analysis_LNch8.pdf,pathwayTwo
1,1,end,none,Allocation in Networks,Notes_Allocation in networks with DON-L3.pdf,pathwayOne
1,1,end,none,Allocation in Networks,Notes_Allocation in networks with DON-L3.pdf,pathwayTwo
Thank you for your help.
CodePudding user response：
It's not zooming the whole page, it's zooming the whole svg, your large margins extend beyond the charting area. One solution is to add the g element not on your svg but only on your chart area.
But using your code, there are 2 things preventing your lines from zooming.
1: your selection is empty - line is a d3 abstraction that returns a path
function zoomed() {
...
// empty selection
console.log(focus.selectAll('line'))
// try instead
console.log(focus.selectAll('path'))
}
2: Simple mistake - you're using the old scale not the new one
function zoomed() {
...
focus.selectAll('path').attr('d', d => {
return d3.line()
// using old scale
.x(di => xScale( di.x))
// change to
.x(di => new_xScale( di.x))
})
}
CodePudding user response：
I don't have a sample of your csv file so this isn't tested, but if you want to zoom the whole chart just add a parent g after your svg and transform that..
...
svg
.append("defs")
.append("clipPath")
.attr("id", "clip")
.append("rect")
.attr("width", width)
.attr("height", height);
// NEW - add g
.append('g')
// NEW - adjust scaleExtent to your needs
const zoom = d3.zoom()
.scaleExtent([1, 8])
.on('zoom', updateChart)
svg.call(zoom)
function updateChart(event) {
svg.attr('transform', event.transform)
}
Note that this also adds pan, but if you only want zoom you can use:
let scale = 1
...
function updateChart(event) {
if(event.transform.k === scale) { return }
svg.attr('transform', event.transform)
scale = event.transform.k
}