I've generated a D3 visualization (a force directed graph) that requires zooming and panning. I've got 2 problems however when it comes to zooming, and I can't find any decent examples on how I might overcome these problems:
The first problem is I've followed all the examples I can find about zooming, which involves adding groupings and adding a rectangle to ensure that the entire area is zoomeable. If I style the rectangle a slightly opaque blue then I get SVG that looks like this when I zoom out:
The problem with this is that I can zoom in/out absolutely fine while I've got my mouse over the blue rectangle area. The problem is I want this to be fully opaque, which means that when I zoom right out, it's very easy to place the cursor outside of this box and then you're unable to zoom in. Is there a way I can make the SVG itself zoomeable or pick up on these events?
This is how I go about generating the various layers and the zoomed function:
function zoomed() {
group2.attr("transform", "translate(" + d3.event.translate + ")scale(" + d3.event.scale + ")");
}
svg = d3.select(target)
.attr("pointer-events", "all")
.append("svg");
group = svg.append('svg:g')
.call(d3.behavior.zoom().on('zoom', zoomed))
.on("dblclick.zoom", null);
group2 = group.append("g");
rect = group2.append('svg:rect')
.style("opacity", 0.3)
.attr('width', width)
.attr('height', height);
The second problem I have is that I'm trying to automatically size my text based on this http://bl.ocks.org/mbostock/1846692 example. When I've tried this however I seem to be getting text that renders really poorly. It seems to suffer from:
Being difficult to read
Not appearing contained within the circle
Being so small the entire thing compresses (image 2)
var texts = planets.append("text")
.text(function(d) { return d.name; })
.style("font-size", "24px") // initial guess
.style("font-size", function(d) {
return Math.min( 2 * d.size, (2 * d.size - 8) / this.getComputedTextLength() * 24) + "px";
})
.attr("dx", function(d) { return -d.size; })
.attr("dy", ".35em")
.style("fill", "white");
I thought that SVG would just handle this, I understand that some of the font-sizes can come out small, but if you zoom in should that not all sort itself out?
I've got a JSFiddle http://jsfiddle.net/IPWright83/vo7Lpefs/22/ to demonstrate.
I've not yet managed to work out a resolution to my first issue (regarding the zooming box) however I did manage to track down the text rendering issue.
This was actually because the each circle/node had a stroke property to provide the white border. This was also applying to the text element, and when the font was very small the stroke was much larger than the overall fill of the text. Removing the stroke from the text elements ensured that they rendered even when very small.
Related
My implementation for Brush & Zoom functionality in my d3 line chart is not working as expected,
I followed this link - https://bl.ocks.org/EfratVil/92f894ac0ba265192411e73f633a3e2f,
Problems what I am facing is -
chart is not showing all the values, I have 4 data but it only shows 3 data
onClick of dot I am showing the rect which is not moving with the brush functionality
minor thing but chart always goes out of the box
My code sandbox - https://codesandbox.io/s/proud-firefly-xy1py
Can someone point out what I am doing wrong? thanks.
Please suggest me what I am doing wrong, thanks.
Your first point is going behind your clip area. For example, if you right click on the first visible circle and inspect element you will see all 4 circle elements are present in the dom. The first circle element is behind the axis.
This means you have to move your plot to the right. Unfortunately, the way you have coded the chart you have not appended a g element for the main chart and then appended the circles and path to that g element. As a result this has to be done in multiple places.
First we adjust your clip path as:
svg
.append("defs")
.append("SVG:clipPath")
.attr("id", "clip")
.append("SVG:rect")
.attr("width", containerWidth)
.attr("height", height)
.attr("x", 40)
.attr("y", 0);
next we adjust your circles
scatter
.selectAll(".foo")
.data(data)
.enter()
.append("circle")
.attr("class", "foo")
.attr("transform", "translate(40,0)")
and then your line
scatter
.append("path")
.datum(data)
.attr("class", "line")
.attr("d", line)
.attr("transform", "translate(40,0)");
You will have to account for this 40 px translate for your other elements as well. Although I am having a hard time destructuring your svg. I think this should give you the idea though. Check the axis matches the time points as well.
Check the code sand box
Update
To make the rectangles move with the brush, you will have to add code to your brushed const function to recalculate the x, y, width and height using the updated scales.
Update2
After going through the codesandbox presented in the comments I was able to add the code to update the rectangles to the brushed const as below to make the rects also move with the brushing:
// update rectangles
scatter
.selectAll(".rect-elements")
.attr("x", d => {
console.log(d);
return xScale(d.startTime) - 12.5;
})
.attr("y", 0)
.attr("width", 24)
.attr("height", height + 5);
Full working Code Sandbox.
I have fought half a day with seemingly simple problem with no avail so I'd love to get some good advice from stackoverflow geniuses.
I have a demo at http://62.165.130.126/d3-question
I tried to put it into jsfiddle but couldn't get the libraries right, hope this still allows you to dive in.
The problem is demonstrating itself in a d3.js javascript code when rotating text disappears. Or actually part of the rotating text.
Each pair of bars on the page should have two lines of the text rotated 45 degrees (downhill) not to write over the neighbors. If I don't rotate text everything is visible (but overlapping), but if I do, only the first pair of lines is OK. After that the first text disappears (or on some version was misplaced by some tens of pixels seemingly haphazard) but the second text sits right where it should using exactly the same code structure. I have exchanged the values and the problem isn't connected with the values but the order.
Here is the main code in javascript I have written.
$.each(data, function(a_key,a_val){
$.each(a_val, function(form_key,form_val){
$.each(form_val, function(person_key,person_val){
svg.append("rect")
.attr("x", start*2*width+width)
.attr("y", 420-person_val.val1/person_val.val1_max*400)
.attr("width", width-5)
.attr("height", person_val.val1/person_val.val1_max*400)
.style("fill", "red");
svg.append("rect")
.attr("x", start*2*width)
.attr("y", 420-person_val.val2/person_val.val2_max*400)
.attr("width", width-5)
.attr("height", person_val.val2/person_val.val2_max*400)
.style("fill", "green");
svg.append("text")
.attr("text-anchor", "start")
.attr("transform","translate(" + start*2*width+20 + ",430) rotate(45)")
.style("font-size","0.85em")
.text(person_val.pname);
svg.append("text")
.attr("text-anchor", "start")
.attr("transform","translate(" + start*2*width + ",430) rotate(45)")
.style("font-size","0.85em")
.text(person_val.ptype);
start++;
});
});
The application is just a mockup of the real solution but should show the essential problem without distractions. Each pair of bars should have the describing text below them. Currently they aren't centered yet but if things sort out that change should be straightforward.
Anybody any idea how to correct the code?
The problem is with "translate(" + start*2*width+20 + ",430) rotate(45)" code.
One of the results is translate(8020,430) rotate(45). Javascript turned 20 into string. Try to put braces around start*2*width+20 expression.
I can successfully display some points on a openlayers basemap using d3.js however I want to actually display icons (at the moment maki png icons) instead of an svg point.
is it possible to load a png/jpg/svg image to a map using d3.js?
So far I can load the icon directly onto the svg but all the markers locate on the same spot so I think I'm having a problem converting the coordinates properly.
var feature = svg.selectAll("path")
.data(amenities.features)
.enter()
.append("svg:image")
.attr("xlink:href", "maki/renders/post-18#2x.png")
.attr("x", function(d, i) {return amenities.features[i].geometry.coordinates[0]})
.attr("y", function(d, i) {return amenities.features[i].geometry.coordinates[1]})
.attr("width", "20")
.attr("height", "20")
.attr("class", "amenity");
Previously I have been able to create an svg with image background inside it using a 'pattern' to show the image so that is also a possibility but I couldn't translate the code to use it with the geographic aspect of d3.
I know I'm writing the icons at the moment to the 'svg' div, so they don't transform correctly when I zoom in and out. I'm aiming to write the images to the 'g' div, as in have code like:
var feature = g.selectAll("path")
but when I use this line, the elements appear on the document but the icons don't actually render on the map.
Thanks in advance.
There a few issues here. First, I'm not sure you fully grasp how d3 selections works, as indicated by the fact that you are binding amenities.features to your selection and then accessing it for the x and y attributes via an index. See How Selections Work for more details on this. In addition, you need to translate the geographic coordinates of the features to screen coordinates by passing them through your geographic projection function. This should get you close:
// more projections: https://github.com/d3/d3-geo-projection/
var projection = d3.geoAlbers();
var amenities = svg.selectAll('.amenities')
.data(amenities.features);
amenities.enter().append('image');
amenities
.attr("class", "amenities")
.attr("xlink:href", "maki/renders/post-18#2x.png")
// The data is already bound so use it instead of the index. Als,
// you need to translate geo coordinates to screen coordinates by
// passing them through your projection function.
.attr("x", function(d,i) {return projection(d.geometry.coordinates)[0];})
.attr("y", function(d,i) {return projection(d.geometry.coordinates)[1];})
.attr("width", "20")
.attr("height", "20")
I don't think I appropriately used groups but I think the key is having the transform then translate thing in there.
So my example is http://bl.ocks.org/mpmckenna8/b87df1c44243aa1575cb.
But because I didn't use groups properly I don't know that the icons would handle zooming like you seem to want. In my example I just append the images to the circles I've created.
.attr("transform", function(d) { return "translate(" + projection(d.geometry.coordinates) + ")"; })
.attr('opacity',.3)
.attr('fill', '#fad959')
I am using dragdealer JS with D3.js. What i am doing is that when You drag the slider made by dragdealer JS the elements made by D3.js will move like a picture slider.
Here is the code which which i wrote : code.
Now there are two problems with this code:
1) This code is working in FireFox but not in Chrome & IE 10?
2) How to configure the slider so that on one slide, only one tile will move into the view and only one will move out?
The number of tiles or rectangles are not fixed. There can be any number of tiles depending on the user.
Code:
var width = 4000,
height = 200,
margin = 2,
nRect = 20,
rectWidth = (width - (nRect - 1) * margin) / nRect,
svg = d3.select('#chart').append('svg')
.attr('width', width);
var data = d3.range(nRect),
posScale = d3.scale.linear()
.domain(d3.extent(data))
.range([0, width - rectWidth]);
console.log(rectWidth)
svg.selectAll('rect')
.data(data)
.enter()
.append('rect')
.attr('x', posScale)
.attr('width', rectWidth)
.attr('height', height);
function redraw(x)
{
svg.transition()
.ease("linear")
.attr("transform", "translate(" + -(x*rectWidth) + ")" );
console.log(-(x*rectWidth));
}
var step = nRect/2;
new Dragdealer('magnifier',
{
steps: step,
snap: true,
animationCallback: function(x, y)
{ console.log(x*10)
redraw(x*step);
}
});
i am trying to devise a way so that the value of steps will change according to the number of tiles.
Please help me.
You had a few problems that I've fixed here: http://jsfiddle.net/SqKZv/1/
In Chrome your svg element needed the height property set
In Chrome/IE, it doesn't appear that you can apply the transform attribute to your SVG element, I'm actually surprised this works in FireFox. I wrapped all of your rect elements in a g element and transformed that.
D3 does dragging very well by itself, so you don't need Dragdealer to do this. In addition to d3.behavior.drag, you can check out d3.svg.brush, specifically these examples of snapping to get what you want:
Brush Snapping http://bl.ocks.org/mbostock/6232537
Brush Snapping II http://bl.ocks.org/mbostock/6232620
You may also want to try out the new D3 feature called brush: https://github.com/mbostock/d3/wiki/SVG-Controls
Here is an example I made using brush to implement a similar feature as you mentioned.
https://github.com/CSE512-14W/a3-chaoyu-aniket
I have set up a clip path on a D3.js zoomable focus and context graph, but have a slight problem. http://nestoria.darkgreener.com/v2/
The clip path is cutting off some circles from the edge of the focus graph - you'll see that the top and right-hand circles are only half there!
It works well on zoom, though, as you'll see if you click and drag the context graph.
So I'm not sure how to create a clip path that doesn't cut off the edges of these circles. This is my code:
focus.append("defs")
.append("clipPath")
.attr("id", "clip")
.append("rect")
.attr("width", width - 200)
.attr("height", height);
var focus_dots = focus
.selectAll(".dot")
.data(mydata[j].data);
focus_dots.enter()
.append("circle")
.attr("clip-path", "url(#clip)");
Any ideas? Your help would be very much appreciated as I'm completely baffled about what to do here!
If you don't want the clipping to not be applied when hovering you can use a stylerule like this:
circle:hover { clip-path: none; }
I had the same problem and got around it using
.attr("transform", "translate(0,-20)")
.attr("height", height+20)
The Idea is a bit hacky, but if you simply move the clipping window up and add the same amount to its height, it should show (in the above case) 20px more on top. (same for left side; concerning the right and bottom side: simply add some pixels to hight/width).
I've used "transform",and the circles were cut to quarter.So use cx and cy instead, problem solved..