Develop Reference

Angular - Can Leaflet measurement tool mute a layer's interactivity?

I'm using Leaflet.Measure for measuring areas and distances and I also have several layers on a map. When you click on a layer, the onclick function is being fired and a popup appears. When I start to measure a new area and click on a map layer, the popup appears again and I cannot measure area further. Is there any possibility to mute layer's interactivity, while I'm using measurement tool?
I tired to import my Angular service class into a measuring plugin to change layer's onclick behaviour, but it didn't work.
Here's a part of Leaflet.Measure plugin code, which I have modified:
import { MapService} from './app/services/map.service';
L.MeasureAction = L.Handler.extend({
_onMouseClick: function (event) {
MapService.enablePopupOpen = false; // if it's set to false, then popup won't open
//default plugin code
var latlng = event.latlng || this._map.mouseEventToLatLng(event);
if (this._lastPoint && latlng.equals(this._lastPoint)) {
return;
}
if (this._trail.points.length > 0) {
var points = this._trail.points;
points.push(latlng);
var length = points.length;
this._totalDistance += this._getDistance(points[length - 2], points[length - 1]);
this._addMeasurePoint(latlng);
//this._addMarker(latlng);
if (this.options.model !== "area") {
this._addLable(latlng, this._getDistanceString(this._totalDistance), "leaflet-measure-lable");
}
} else {
this._totalDistance = 0;
this._addMeasurePoint(latlng);
this._addMarker(latlng);
if (this.options.model !== "area") {
this._addLable(latlng, L.Measure.start, "leaflet-measure-lable");
}
this._trail.points.push(latlng);
}
this._lastPoint = latlng;
this._startMove = false;
},
...
})

Highcharts 6.0 Synchronization Bug

I'm trying to use Highcharts Synchronization for a slightly complex chart. I've gotten synchronization to work just fine on graphs with just 1 series for other plots.
You can check out the example here: http://jsfiddle.net/nhng5827/o9uh2jqy/42/
I've dumbed down my complex chart to just a few points, and usually the chart has 6 lines as opposed to 4. As you can see, the tooltip only appears on the right side of the graph, and everything is delayed. I also do not want the callout box to have any numbers read out if the tooltip is not hovered the specific lines.
I've done a fair bit of research and have implemented some code I've seen that allows for charts with 2 series to be synchronized (http://jsfiddle.net/mjsdnngq/72/), however I think the biggest difference in mine is that the series only go to about half of the actual chart.
$('#container').bind('mousemove touchmove touchstart', function (e) {
var chart,
points,
i,
secSeriesIndex = 1;
for (i = 0; i < Highcharts.charts.length; i++) {
chart = Highcharts.charts[i];
e = chart.pointer.normalize(e); // Find coordinates within the chart
points = [chart.series[0].searchPoint(e, true), chart.series[1].searchPoint(e, true),chart.series[2].searchPoint(e, true),chart.series[3].searchPoint(e, true)]; // Get the hovered point
if (points[0] && points[1]&& points[2]&& points[3]) {
// if (!points[0].series.visible) {
// points.shift();
// secSeriesIndex = 0;
// }
// if (!points[secSeriesIndex].series.visible) {
// points.splice(secSeriesIndex,1);
// }
if (points.length) {
chart.tooltip.refresh(points); // Show the tooltip
chart.xAxis[0].drawCrosshair(e, points[0]); // Show the crosshair
chart.xAxis[0].drawCrosshair(e, points[3]); // Show the crosshair
}
}
}
});
/**
* Override the reset function, we don't need to hide the tooltips and crosshairs.
*/
Highcharts.Pointer.prototype.reset = function () {
return undefined;
};
Highcharts.Point.prototype.highlight = function (event) {
this.onMouseOver(); // Show the hover marker
this.series.chart.tooltip.refresh([points[0],points[1],points[2],points[3]]); // Show the tooltip
this.series.chart.xAxis[0].drawCrosshair(event, this); // Show the crosshair
};
/**
* Synchronize zooming through the setExtremes event handler.
*/
function syncExtremes(e) {
var thisChart = this.chart;
if (e.trigger !== 'syncExtremes') { // Prevent feedback loop
Highcharts.each(Highcharts.charts, function (chart) {
if (chart !== thisChart) {
if (chart.xAxis[0].setExtremes) { // It is null while updating
chart.xAxis[0].setExtremes(e.min, e.max, undefined, false, { trigger: 'syncExtremes' });
}
}
});
}
}
Any help would be immensely appreciated.

To correctly synchronize charts, you have to clear points state on every mousemove event:
Highcharts.each(chart.series, function(s) {
Highcharts.each(s.points, function(p) {
p.setState('');
});
});
Live demo: http://jsfiddle.net/BlackLabel/cvb6pwsu/
API Reference: https://api.highcharts.com/class-reference/Highcharts.Point#setState
Also, please take a look at this example: http://jsfiddle.net/BlackLabel/6f37b42q/, it can be useful for you.

Chart.js drag points on linear chart

I have a simple linear chart built with Chart.js library.
And i want to allow user to drag points on chart for dynamically change data of it. I tied chartjs-plugin-draggable but it works for me only with annotations. I need graph exactly like this:
https://www.rgraph.net/canvas/docs/adjusting-line.html
But use new graph library in project is not good solution :(
Also i tried to play with dot event's.
UPDATE:
With angular i created something like this.
Maybe if there is no way to add drag&drop to points, there will be a hack to put "sliders" with absolute position on graph on points positions. I didn't find any info too :(

In case anyone is looking for a solution that doesn't require the use of plugins, it's pretty straightforward to do it in vanilla chart.js.
Here's a simple working example - just click and drag a data point
// some data to be plotted
var x_data = [1500,1600,1700,1750,1800,1850,1900,1950,1999,2050];
var y_data_1 = [86,114,106,106,107,111,133,221,783,2478];
var y_data_2 = [2000,700,200,100,100,100,100,50,25,0];
// globals
var activePoint = null;
var canvas = null;
// draw a line chart on the canvas context
window.onload = function () {
// Draw a line chart with two data sets
var ctx = document.getElementById("canvas").getContext("2d");
canvas = document.getElementById("canvas");
window.myChart = Chart.Line(ctx, {
data: {
labels: x_data,
datasets: [
{
data: y_data_1,
label: "Data 1",
borderColor: "#3e95cd",
fill: false
},
{
data: y_data_2,
label: "Data 2",
borderColor: "#cd953e",
fill: false
}
]
},
options: {
animation: {
duration: 0
},
tooltips: {
mode: 'nearest'
}
}
});
// set pointer event handlers for canvas element
canvas.onpointerdown = down_handler;
canvas.onpointerup = up_handler;
canvas.onpointermove = null;
};
function down_handler(event) {
// check for data point near event location
const points = window.myChart.getElementAtEvent(event, {intersect: false});
if (points.length > 0) {
// grab nearest point, start dragging
activePoint = points[0];
canvas.onpointermove = move_handler;
};
};
function up_handler(event) {
// release grabbed point, stop dragging
activePoint = null;
canvas.onpointermove = null;
};
function move_handler(event)
{
// locate grabbed point in chart data
if (activePoint != null) {
var data = activePoint._chart.data;
var datasetIndex = activePoint._datasetIndex;
// read mouse position
const helpers = Chart.helpers;
var position = helpers.getRelativePosition(event, myChart);
// convert mouse position to chart y axis value
var chartArea = window.myChart.chartArea;
var yAxis = window.myChart.scales["y-axis-0"];
var yValue = map(position.y, chartArea.bottom, chartArea.top, yAxis.min, yAxis.max);
// update y value of active data point
data.datasets[datasetIndex].data[activePoint._index] = yValue;
window.myChart.update();
};
};
// map value to other coordinate system
function map(value, start1, stop1, start2, stop2) {
return start2 + (stop2 - start2) * ((value - start1) / (stop1 - start1))
};
body {
font-family: Helvetica Neue, Arial, sans-serif;
text-align: center;
}
.wrapper {
max-width: 800px;
margin: 50px auto;
}
h1 {
font-weight: 200;
font-size: 3em;
margin: 0 0 0.1em 0;
}
h2 {
font-weight: 200;
font-size: 0.9em;
margin: 0 0 50px;
color: #555;
}
a {
margin-top: 50px;
display: block;
color: #3e95cd;
}
<!DOCTYPE html>
<html>
<!-- HEAD element: load the stylesheet and the chart.js library -->
<head>
<title>Draggable Points</title>
<script src="https://cdn.jsdelivr.net/npm/chart.js#2.9.3/dist/Chart.min.js"></script>
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<!-- BODY element: create a canvas and render a chart on it -->
<body>
<!-- canvas element in a container -->
<div class="wrapper">
<canvas id="canvas" width="1600" height="900"></canvas>
</div>
<!-- call external script to create and render a chart on the canvas -->
<script src="script.js"></script>
</body>
</html>

Update: My previous answer got deleted because it only featured a link to a plugin solving the issue, however here comes the explanation to what it does:
The general procedure on how to achieve the desired behaviour is to
Intercept a mousedown (and check if it's a dragging gesture) on a given chart
Check if the mousedown was over a data point using the getElementAtEvent function
On mousemove, translate the new Y-Pixel value into a data coordinate using the axis.getValueForPixel function
Synchronously update the chart data using chart.update(0)
as pointed out in this Chart.js issue.
In order to intercept the mousedown, mousemove and mouseup events (the dragging gesture), event listeners for said events need to be created. In order to simplify the creation of the listeners one may use the d3 library in this case as follows:
d3.select(chartInstance.chart.canvas).call(
d3.drag().container(chartInstance.chart.canvas)
.on('start', getElement)
.on('drag', updateData)
.on('end', callback)
);
On mousedown (the 'start' event here), a function (getElement) may be called thatfetches the closest chart element to the pointers location and gets the ID of the Y-Scale
function getElement () {
var e = d3.event.sourceEvent
element = chartInstance.getElementAtEvent(e)[0]
scale = element['_yScale'].id
}
On mousemove ('drag'), the chart data is supposed to be updated according to the current Y-Pixel value of the pointer. We can therefore create an updateData function that gets the position of the clicked data point in the charts data array and the according dataset like this
function updateData () {
var e = d3.event.sourceEvent
var datasetIndex = element['_datasetIndex']
var index = element['_index']
var value = chartInstance.scales[scale].getValueForPixel(e.clientY)
chartInstance.data.datasets[datasetIndex].data[index] = value
chartInstance.update(0)
}
And that's it! If you need to store the resulting value after dragging, you may also specify a callback function like this
function callback () {
var datasetIndex = element['_datasetIndex']
var index = element['_index']
var value = chartInstance.data.datasets[datasetIndex].data[index]
// e.g. store value in database
}
Here is a working fiddle of the above code. The functionality is also the core of the Chart.js Plugin dragData, which may be easier to implement in many cases.

Here is how I fixed using both touchscreen or mouse event x,y coordinates for the excellent d3 example above by wrapping event screen coordinates in a more "generic" x,y object.
(Probably d3 has something similar to handle both types of events but lot of reading to find out..)
//Get an class of {points: [{x, y},], type: event.type} clicked or touched
function getEventPoints(event)
{
var retval = {point: [], type: event.type};
//Get x,y of mouse point or touch event
if (event.type.startsWith("touch")) {
//Return x,y of one or more touches
//Note 'changedTouches' has missing iterators and can not be iterated with forEach
for (var i = 0; i < event.changedTouches.length; i++) {
var touch = event.changedTouches.item(i);
retval.point.push({ x: touch.clientX, y: touch.clientY })
}
}
else if (event.type.startsWith("mouse")) {
//Return x,y of mouse event
retval.point.push({ x: event.layerX, y: event.layerY })
}
return retval;
}
.. and here is how I would use it in the above d3 example to store the initial grab point Y. And works for both mouse and touch.
Check the Fiddle
Here how I solved the problem with using d3 and wanting to drag the document on mobile or touch screens. Somehow with the d3 event subscription all Chart area events where already blocked from bubbling up the DOM.
Was not able to figure out if d3 could be configured to pass canvas events on without touching them. So in a protest I just eliminated d3 as it was not much involved other than subscribing events.
Not being a Javascript master this is some fun code that subscribes the events the old way. To prevent chart touches from dragging the screen only when a chart point is grabed each of the handlers just have to return true and the event.preventDefault() is called to keep the event to your self.
//ChartJs event handler attaching events to chart canvas
const chartEventHandler = {
//Call init with a ChartJs Chart instance to apply mouse and touch events to its canvas.
init(chartInstance) {
//Event handler for event types subscribed
var evtHandler =
function myeventHandler(evt) {
var cancel = false;
switch (evt.type) {
case "mousedown":
case "touchstart":
cancel = beginDrag(evt);
break;
case "mousemove":
case "touchmove":
cancel = duringDrag(evt);
break;
case "mouseup":
case "touchend":
cancel = endDrag(evt);
break;
default:
//handleDefault(evt);
}
if (cancel) {
//Prevent the event e from bubbling up the DOM
if (evt.cancelable) {
if (evt.preventDefault) {
evt.preventDefault();
}
if (evt.cancelBubble != null) {
evt.cancelBubble = true;
}
}
}
};
//Events to subscribe to
var events = ['mousedown', 'touchstart', 'mousemove', 'touchmove', 'mouseup', 'touchend'];
//Subscribe events
events.forEach(function (evtName) {
chartInstance.canvas.addEventListener(evtName, evtHandler);
});
}
};
The handler above is initiated like this with an existing Chart.js object:
chartEventHandler.init(chartAcTune);
The beginDrag(evt), duringDrag(evt) and endDrag(evt) have the same basic function as in the d3 example above. Just returns true when wanting to consume the event and not pasing it on for document panning and similar.
Try it in this Fiddle using a touch screen. Unless you touch close to select a chart point the rest of the chart will be transparent to touch/mouse events and allow panning the page.

highstocks - legend position and refresh legend values on mousemove of multiple charts

Here is the scenario. I've multiple highstocks say 10 charts on a single page. Currently I've written 500 lines of code to position the legend, show tooltip and refresh the legend values on mousemove.
No. of legends vary per chart. On mousemove values of all the legends are updated. I need to optimize the code I am using highstocks v1.2.2.
Above screenshot shows 2 charts. Return, Basket, vs Basket Spread are legends and it's values are updated on every mousemove.
Please find this fiddle for example. In my case legends are positioned and updated values on mouse move with hundreds of lines of code. When I move the mouse the legend values of Return and Basket of first chart and the legend values of vs Basket Spread are updated. It's working fine but with lots of javascript code. So I need to optimize it less code or with highstocks built-in feature.
Update
User #wergeld has posted new fiddle. As I've shown in screenshot when cross-hair is being moved over any chart, the legend values of all the charts should be updated.
Is there anyway to implement the same functionality with less code or is there built-in feature available in highstocks ???
Using this as a reference.

Basic example would be to use the events.mouseover methods:
plotOptions: {
series: {
point: {
events: {
mouseOver: function () {
var theLegendList = $('#legend');
var theSeriesName = this.series.name;
var theYValue = this.y;
$('li', theLegendList).each(function (l) {
if (this.innerText.split(':')[0] == theSeriesName) {
this.innerText = theSeriesName + ': ' + theYValue;
}
});
}
}
}
}
}
This is assuming I have modded the <li> to be:
$('<li>')
.css('color', serie.color)
.text(serie.name + ': NA')
.click(function () {
toggleSeries(i);
})
.appendTo($legend);
You would then need to handle the mouseout event but I do not know what you want to do there.
Working example.
EDIT:
Here is a version using your reference OHLC chart to put the values in a different legend location when any point in the chart is hovered.
plotOptions: {
series: {
point: {
events: {
mouseOver: function () {
//using the ohlc and volumn data sets created at runtime.
var stockVal = ohlc[this.index][4]; // show close value
var stockVolume = volume[this.index][1];
var theChart = $('#container').highcharts();
var theLegendList = $('#legend');
$('li', theLegendList).each(function (l) {
var legendTitle = theChart.series[l].name;
if (l === 0) {
this.innerText = legendTitle + ': ' + stockVal;
}
if (l === 1) {
this.innerText = legendTitle + ': ' + stockVolume;
}
});
}
}
}
}
}

Highcharts: Hide and show legend

I'd like to be able to toggle the visibility of the legend of a chart when the user clicks a button.
I've tried hiding the legend using the undocumented destroy() method, however when I try to re-render the legend and it's items, the items appear in the top left of the chart instead of within the legend. The items also don't seem to have any of their event handlers attached (clicking on an item no longer toggles a series).
Is there a better way to do this? I have to support both SVG and VML implementations, so am looking for a solution that would address both.
JSFiddle Example
$('#updateLegend').on('click', function (e) {
var enable = !chart.options.legend.enabled;
chart.options.legend.enabled = enable;
if (!enable) {
chart.legend.destroy(); //"hide" legend
} else {
var allItems = chart.legend.allItems;
//add legend items back to chart
for (var i = 0; i < allItems.length; i++) {
var item = allItems[i];
item.legendItem.add();
item.legendLine.add();
item.legendSymbol.add();
}
//re-render the legend
chart.legend.render();
}
});

In case when you destroy legend, then you need to generate full legend. Simpler solution is use hide() / show() function for elements.
http://jsfiddle.net/sbochan/3Bh7b/1/
$('#updateLegend').click(function (e) {
var legend = chart.legend;
if(legend.display) {
legend.group.hide();
legend.box.hide();
legend.display = false;
} else {
legend.group.show();
legend.box.show();
legend.display = true;
}
});

Here is an interesting solution I came up with - works for Highcharts3 and Highstocks1.3
https://bitbucket.org/jkowalleck/highcharts-legendextension
All you have to do is to add the HighchartsExtension I wrote to your HTML page, and you get 3 new functions added to the Chart:
myChart.legendHide() ,
myChart.legendShow() and
myChart.legendToggle()
See the examples:
in Highcharts with floating legend: http://jsfiddle.net/P2g6H/
in Highstocks with static legend: http://jsfiddle.net/ps6Pd/

As simple as
myChartObject.legend.update({
enabled:true
});

A fairly simple way to make this is to loop over the series and update them to not show in legend. This allows you to animate in and out of showing the legend and utilize the entire container space, as the methods are built in.
For example, toggling legend items would look like this:
$('#toggleButton').click(function() {
for(i in chart.series)
chart.series[i].update({ showInLegend: chart.series[i].options.showInLegend == null ? false : !chart.series[i].options.showInLegend }, false);
chart.redraw();
});
See this JSFiddle demonstration for toggle, show and hide using buttons.

Update a code little bit of selected answer. Now it will increase the space when show/hide legend.
$('#updateLegend').click(function (e) {
var legend = chart.legend;
if(legend.display) {
legend.group.hide();
legend.box.hide();
legend.display = false;
} else {
legend.group.show();
legend.box.show();
legend.display = true;
}
var series = chart.series[0];
$(chart.series).each(function(){
this.setVisible(true, false);
});
chart.redraw();
});

So far only working solution in the world:
for (i = 0; i < chart.series.length; i++)
chart.series[i].options.showInLegend = true;
chart.series[0].setData(chart.series[0].data);
Rendering manually doesn't work (hiding legend.box etc, always if there are multiple pages in legend, then browser button stays).
setData calls internal renderer which acts quite good and does all what is needed.
Hmm, maybe in the end you can do this:
chart.setSize(
chartWidth,
chartHeight+chart.legend.fullHeight,
false
);