I am using Techanjs to create updating candlestick chart, the example I am referring is => http://bl.ocks.org/andredumas/95f1f22130fb1a3a8181
This example doesn't support zoom so from another example => http://bl.ocks.org/andredumas/a48008ea8e2c832144db I copied the code for zoom. My chart is zooming now but now the issue I am facing is the zoom got reset to the original zoom level when the new candle gets added in the chart. current code
function zoomed() {
var rescaledY = d3.event.transform.rescaleY(y);
yAxis.scale(rescaledY);
candlestick.yScale(rescaledY);
Code I tried:
function zoomed() {
let t = d3.zoomTransform( svg.node());
var rescaledY = t.rescaleY(y);
yAxis.scale(rescaledY);
candlestick.yScale(rescaledY);
below line is present where I am reading the json
zoomableInit = x.zoomable().clamp(false).copy();
To freeze the zoom I tried to modify the rescaleY and rescaleX functions but didn't really understand the required changes. Please suggest.
Related
I am trying to reset after choosing some of the individual's bar.
index.html: (line no. 62)
<span>
reset
</span>
This seems not to work. I was able to reset all the graphs pie chart, line chart, etc but not this one.
Those two ordinal graphs are created in index.js like this:
var focus = new dc.barChart('#focus');
var range = new dc.barChart('#range');
https://blockbuilder.org/ninjakx/483fd69328694c6b6125bb43b9f7f8a7
Update:
It looks weird now Coz it's showing a single bar and all the bar have got invisible but I want them to be visible (in gray colour) but not clickable.
This example replaces the built-in filtering functionality of the bar chart with its own implementation of ordinal selection, because the chart has a linear scale.
The example uses a global variable focusFilter to store the current selection. We need to empty this out and we also need to update the dimension filter as the original filterAll would do, pulling that code out of the click handler:
focus.applyFilter = function() { // non-standard method
if(focusFilter.length)
this.dimension().filterFunction(function(k) {
return focusFilter.includes(k);
});
else this.dimension().filter(null);
};
focus.filterAll = function() {
focusFilter = [];
this.applyFilter();
};
This will also allow dc.filterAll() to work, for a "reset all" link.
Fork of your block.
For some reason, I could not get the original
reset
links to work at all in this block, so I replaced them with the equivalent D3 click handlers:
d3.select('#reset-focus').on('click', () => {
focus.filterAll();
dc.redrawAll();
})
d3.select('#reset-all').on('click', () => {
dc.filterAll();
dc.redrawAll();
})
I also updated the focus ordinal bar example. Note that automatic hiding/showing of the reset link doesn't work because the chart still has an irrelevant range filter inside of it.
Following my previous question Disable resize of brush on range chart from focus charts (dc.js, d3.js) - Solved and my previous fiddle,https://jsfiddle.net/dani2011/uzg48yk7/1/, still need to disable brush drawing on the range chart before selecting a scale from the dropdown and/or on page load (!isPostback):
a) When panning /translating the line of the focus charts (bitChart,bitChart2) the brush is displayed on the whole range of the range chart:
b) It is possible to drag the brush on the range chart
Tried to cancel the zoom event using event listeners as followed:
var anotherRoot = d3.select("div#bitrate-timeSlider-chart.dc-chart").select(".chart-body");
anotherRoot.on("mousedown", null)
anotherRoot.on("mousemove.zoom", null)
anotherRoot.on("dblclick", null)
anotherRoot.on("touchstart", null)
anotherRoot.on("wheel", null)
anotherRoot.on("mousewheel.zoom", null)
anotherRoot.on("MozMousePixelScroll.zoom", null)
Tried to use different SVG scopes instead of anotherRoot such as:
//option 1
var rootSvg = d3.select("#bitrate-timeSlider-chart svg brush")
//option 2
var brushSVG = d3.select("#bitrate-timeSlider-chart").select("g.brush").select("*");
//option 3
d3.select("#bitrate-timeSlider-chart").on("touchstart.zoom", null);
d3.select("#bitrate-timeSlider-chart").on("mouse.zoom",
null);
Tried to cancel the event listeners:
1) Directly in my js file
2) Within the range chart (timeSlider)
3) Within the range chart events such as .on(render...) , .on(postRedraw...)
4) Tried to remove the brush within .on(postRedraw...) and within (!isPostBack) using:
//JS file
function isPostBack() { //function to check if page is a postback-ed one
return document.getElementById('_ispostback').value == 'True';
}
//HTML file
....
</script>
<input type="hidden" id="_ispostback" value="<%=Page.IsPostBack.ToString()%>" />
</body>
</html>
d3.select("#bitrate-timeSlider-chart").selectAll("g.brush").selectAll("*").data(data[0]).exit().remove();
Any help would be appreciated.
Okay, the answer I provided to the previous question for fixing the brush size was broken by these lines:
document.getElementById("alert").style.display = "inline";
There's no #alert element, so it crashes every time. I've restored that to the way I wrote it and it's a little bit messy when you drag, but at least it locks the brush size.
As for the other parts, now we're (finally) getting into documented behavior. Yay!
It's not perfect, but you can enable the brush only when there is a scale selection. Just disable it at first:
timeSlider
.brushOn(false)
and then enable it with a render when a scale has been selected:
function addHours(amountHours) {
var showBrush = +amountHours !== 0;
if(timeSlider.brushOn() !== showBrush)
timeSlider.brushOn(showBrush)
.render();
The render is not great, we'd rather do a redraw, but apparently the chart will only look at .brushOn() on render. Something to look into in the future.
We can also disable the styles which make it look like it has a ordinal brush and wants to be clicked on, like this:
.dc-chart rect.bar {
cursor: default;
}
.dc-chart rect.bar:hover {
fill-opacity: 1;
}
As for preventing zoom on the focus charts, you just need to set .zoomScale():
bitChartGeneral
.zoomScale([1,1]);
This sets d3.zoom.scaleExtent, locking the zoom.
Here's the updated fiddle: https://jsfiddle.net/gordonwoodhull/dsfqeut8/5/
I'm facing shieldUI wicket integration and I'm trying to get base 64 image dfom a shieldUi chart using this tutorial: https://www.shieldui.com/documentation/javascript.chart/exporting
I tried to run the code below:
function render_image_box(chart_id) {
var result = false;
var svg_chart = $("#" + chart_id);
if (svg_chart) {
var chart = svg_chart.swidget();
if (chart != null) {
chart.exportToImage();
result = true;
}
}
// setTimeout(find_image_source, 100) // wait before continuing
return chart;
}
in both the $(document).ready(..) and $(window).load(...) functions and the load event raised from the library (https://www.shieldui.com/documentation/javascript.chart/events/load) as well.
In none of these function chart is rendered yet, so the svg_chart.swidget() returns null.
Is there any other event to use to accomplish my goal or any other way to get the image source?
Thanks in advance,
Laura
You can access the chart instance using .swidget() only after you have initialized it with the .shieldChart() constructor.
To make your code work, you should also turn off animation for the chart, because right after you initialize it, the rendering will not be over and there will be no image contents.
Here is a complete JSBin to get you started...
I've created an NVD3 multiBarChart and placed it in a jQuery resizable container. When resizing the chart, each render incurs the same delay as when the chart is first drawn: staggered left-to-right delayed drawing of the bars. This looks cool when the chart is first drawn, but it's a nuisance when resizing the chart. I've experimented with nv.d3.css, reducing every delay to 0ms to no avail. Haven't yet inspected the NVD3 JS and am hoping not to need to.
Fiddle:
http://jsfiddle.net/a5Fnj/10/
var container = $("#mycontainer");
$(container[0]).resizable();
var svg = d3.select(container[0]).append("svg");
nv.addGraph(function () {
var chart = nv.models.multiBarChart();
chart.xAxis.tickFormat(d3.format(',f'));
chart.yAxis.tickFormat(d3.format(',.1f'));
d3.select(container[0]).select("svg")
.datum(exampleData())
.transition().duration(0).call(chart);
nv.utils.windowResize(chart.update);
this.stackedbar = chart;
});
function exampleData() {
return stream_layers(3, 10 + Math.random() * 100, .1).map(function (data, i) {
return {
key: 'Stream' + i,
values: data
};
});
}
As of NVD3 1.7.1 you can use the duration option:
chart.duration(0);
I used transitionDuration: -1 that worked for a stackedAreaChart.
Edit
This helped remove the transition when appending chart data, not the re-size issue, please check the comments below.
In the latest version (from github), you can set .transitionDuration():
chart.transitionDuration(0);
Edit: Even with this, some of the transitions/durations are hardcoded in the NVD3 source. The only way to get rid of those is to modify the source.
I'm working on some bar charts and need to update the chart values. The only way I've found to do this is to redraw the whole thing. Isn't there a way to simple update the bars? And if so what I'm really hoping to do is animate that change. Any suggestions?
http://jsfiddle.net/circlecube/MVwwq/
Here's what you want (updated Fiddle).
You were on the right track for creating a new bar chart. The only issue is, you don't want to "display" that bar chart, but you want to use its bars for animation. While this does generate a new graph which we later throw away (using remove()), it seems to be Raphael best practice.
function b_animate(){
//First, create a new bar chart
var c2 = bars.g.barchart(200, 0, 300, 400, [bdata], {stacked: false, colors:["#999","#333","#666"]});
//Then for each bar in our chart (c), animate to our new chart's path (c2)
$.each(c.bars[0], function(k, v) {
v.animate({ path: c2.bars[0][k].attr("path") }, 200);
v.value[0] = bdata[k][0];
});
//Now remove the new chart
c2.remove();
}
This is not complete, as we haven't animated the legends to match the new chart, but this technique applied to the labels should get you there. Basically, we need to re-map the hovers to show new labels (and remove the old labels).
Hopefully, this should work exactly like you hoped. Let me know if you have any issues. Enjoy!
I had to adapt the above code to get this to work with Raphaël 2.1.0 and g.Raphael 0.51 and JQuery 1.9.1:
function b_animate(){
var c2 = bars.barchart(10, 10, 500, 450, bdata, { colors:custom_colors});
$.each(c.bars, function(k, v) {
v.animate({ path: c2.bars[k][0].attr("path") }, 500);
v[0].value = bdata[k][0];
});
c2.remove();}
Hope this helps!