Inputting data as follows works:
[
{
x: 1,
y: 2
},
{
x: 2,
y: 3
},
]
Depending on the data-source it needs some conversion though. In my use case I already have the data in RAM as follows:
[
[1,2],
[2,3]
]
As I am speaking about >500k data points, the loop for formatting the data is very expensive. I do it with a map-function right now.
var plotData = myArray.map(function (value) {
return {
x: value[0],
y: value[1]
};
});
Is there any possibility to pass the data as is (array of arrays)? I can't find any hint in the docs.
How it currently works:
https://jsfiddle.net/txugfcnd/
Related
In Swift Charts the signature for chartForegroundStyleScale to set the ShapeStyle for each data series is:
func chartForegroundStyleScale<DataValue, S>(_ mapping: KeyValuePairs<DataValue, S>) -> some View where DataValue : Plottable, S : ShapeStyle
The KeyValuePairs initialiser (init(dictionaryLiteral: (Key, Value)...)) only takes a variadic parameter so any attempt to initialise a foreground style from an array (in my case <String, Color>) results in the error:
Cannot pass array of type '[(String, Color)]' as variadic arguments of type '(String, Color)'
In my application the names of the chart series are set dynamically from the data so although I can generate a [String : Color] dictionary or an array of (String, Color) tuples I can't see that it's possible to pass either of these into chartForegroundStyleScale? Unless I'm missing something this seems like a odd limitation in Swift charts that the series names need to be hard coded for this modifier?
OK I've found an approach that works as long as an arbitrary limitation to the number of entries is acceptable (example below with max size of 4:
func keyValuePairs<S, T>(_ from: [(S, T)]) -> KeyValuePairs<S, T> {
switch from.count {
case 1: return [ from[0].0 : from[0].1 ]
case 2: return [ from[0].0 : from[0].1, from[1].0 : from[1].1 ]
case 3: return [ from[0].0 : from[0].1, from[1].0 : from[1].1, from[2].0 : from[2].1 ]
default: return [ from[0].0 : from[0].1, from[1].0 : from[1].1, from[2].0 : from[2].1, from[3].0 : from[3].1 ]
}
In my case I know that there won't be more than 20 mappings so this func can just be extended to accommodate that number.
Not ideal, but it works...
You could also pass an array of colors to .chartForegroundStyleScale(range:). As long as you add the colors to the array in the same order you add your graph marks it should work fine.
Not incredibly elegant either, but this approach works with an arbitrary number or entries.
struct GraphItem: Identifiable {
var id = UUID()
var label: String
var value: Double
var color: Color
}
struct ContentView: View {
let data = [
GraphItem(label: "Apples", value: 2, color: .red),
GraphItem(label: "Pears", value: 3, color: .yellow),
GraphItem(label: "Melons", value: 5, color: .green)
]
var body: some View {
Chart {
ForEach(data, id: \.label) { item in
BarMark(
x: .value("Count", item.value),
y: .value("Fruit", item.label)
)
.foregroundStyle(by: .value("Fruit", item.label))
}
}
.chartForegroundStyleScale(range: graphColors(for: data))
}
func graphColors(for input: [GraphItem]) -> [Color] {
var returnColors = [Color]()
for item in input {
returnColors.append(item.color)
}
return returnColors
}
}
Imagine a simple line graph plotting a person count (y-axis) against a custom time value (x-axis), as such:
Suppose you have another dimension, say specific groupings of people, how do you draw a separate line on this graph for each group?
You have to use the PivotConfig here an example I used in Angular
(EDIT) Here is the Query
Query = {
measures: ['Admissions.count'],
timeDimensions: [
{
dimension: 'Admissions.createdDate',
granularity: 'week',
dateRange: 'This quarter',
},
],
dimensions: ['Admissions.status'],
order: {
'Admissions.createdDate': 'asc',
},
}
(END EDIT)
PivotConfig = {
x: ['Admissions.createdDate.day'],
y: ['Admissions.status', 'measures'],
fillMissingDates: true,
joinDateRange: false,
}
Code to extract data from resultset :
let chartData = resultSet.series(this.PivotConfig).map(item => {
return {
label: item.title.split(',')[0], //title contains "ADMIS, COUNT"
data: item.series.map(({ value }) => value),
}
})
Result Object (not the one in the chart):
[{
"label": "ADMIS",
"data": [2,1,0,0,0,0,0]
},{
"label": "SORTIE",
"data": [2,1,0,0,0,0,0]
}]
Here is what the output looks like!
The chart renderer in the Developer Playground is meant to be quite simplistic; I'd recommend creating a dashboard app or using one of our frontend integrations in an existing project to gain complete control over chart rendering.
Is there any way to display one polyline with two different colours(ex: based on road speed limit) in leaflet by using shiny? Any help could be highly appreciated.
You can use this plugin : http://hgoebl.github.io/Leaflet.MultiOptionsPolyline/demo/
You will have to define the speed for each point in your GeoJSON properties.
Then you simply have to add this code after :
var myPolyline = L.multiOptionsPolyline(YourGeoJSONHere, {
multiOptions: {
optionIdxFn: function (latLng) {
var i,
speedThresholds = [5, 10, 15, 30];
for (i = 0; i < speedThresholds.length; ++i) {
if (latLng.alt <= speedThresholds[i]) {
return i;
}
}
return speedThresholds.length;
},
options: [
{color: '#0000FF'}, {color: '#0040FF'},
{color: '#0080FF'}, {color: '#00FFB0'}
]
},
weight: 5,
opacity: 0.9,
smoothFactor: 1
}).addTo(layerTrace);
For the speed : https://github.com/hgoebl/Leaflet.MultiOptionsPolyline/blob/master/demo/js/demo.js#L59-L80
I have a question about creating the custom visualization in Power BI.
I want to implement a "total row" functionality which is available in the built-in matrix visualization. The main concept is to automatically sum-up every value and group it by the rows. This is how it's looks like on the matrix visualization:
But, to be honest, I don't know how to achieve this. I try different things but I can't receive this grouped values in the dataViews.
I tried to analyze the built-in matrix.ts code but it's quite different that the custom visualizations code. I found the customizeQuery method which set the subtotalType property to the rows and columns - I tried to add this in my code but I don't see any difference in the dataViews (I don't found the grouped value).
Currently my capabilities.dataViewMappings is set like this:
dataViewMappings: [
{
conditions: [
{ 'Rows': { max: 3 } }
],
matrix: {
rows: {
for: { in: 'Rows' },
},
values: {
for: { in: 'Values' }
},
},
}
]
Does anyone know how we could achieve this "total row" functionality?
UPDATE 1
I already found the solution: when we implement the customizeQuery method (in the same way as the customizeQuery method in the matrix.ts code), and then add the reference to it in the powerbi.visuals.plugins.[visualisationName+visualisationAddDateEpoch].customizeQuery then it works as expected (I receive in the dataViews[0].matrix.row.root children elements that has the total values from row).
The only problem now is that I don't know exactly how to add correctly this reference to the customizeQuery method. For example the [visualisationName+visualisationAddDateEpoch] is Custom1451458639997, and I don't know what those number will be (I know only the name). I created the code in my visualisation constructor as below (and it's working):
constructor() {
var targetCustomizeQuery = this.constructor.customizeQuery;
var name = this.constructor.name;
for(pluginName in powerbi.visuals.plugins) {
var patt = new RegExp(name + "[0-9]{13}");
if(patt.test(pluginName)) {
powerbi.visuals.plugins[pluginName].customizeQuery = targetCustomizeQuery;
break;
}
}
}
But in my opinion this code is very dirty and inelegant. I want to improve it - what is the correct way to tell the Power BI that we implement the custom customizeQuery method and it should use it?
UPDATE 2
Code from update 1 works only with the Power BI in the web browser (web based). On the Power BI Desktop the customizeQuery method isn't invoked. What is the correct way to tell the Power BI to use our custom customizeQuery method? In the code from PowerBI-visuals repository using PowerBIVisualPlayground we could declare it in the plugin.ts file (in the same way like the matrix visual is done):
export let matrix: IVisualPlugin = {
name: 'matrix',
watermarkKey: 'matrix',
capabilities: capabilities.matrix,
create: () => new Matrix(),
customizeQuery: Matrix.customizeQuery,
getSortableRoles: (visualSortableOptions?: VisualSortableOptions) => Matrix.getSortableRoles(),
};
But, in my opinion, from the Power BI Dev Tools we don't have access to add additional things to this part of code. Any ideas?
It seems you're missing the columns mapping in your capabilities. Take a look at the matrix capabilities (also copied for reference below) and as a first step adopt that structure initially. The matrix calculates the intersection of rows and columns so without the columns in capabilities its doubtful you'll get what you want.
Secondly, in the matrix dataview passed to Update you'll get a 'DataViewMatrixNode' with isSubtotal: true Take a look at the unit tests for matrix to see the structure.
dataViewMappings: [{
conditions: [
{ 'Rows': { max: 0 }, 'Columns': { max: 0 }, 'Values': { min: 1 } },
{ 'Rows': { min: 1 }, 'Columns': { min: 0 }, 'Values': { min: 0 } },
{ 'Rows': { min: 0 }, 'Columns': { min: 1 }, 'Values': { min: 0 } }
],
matrix: {
rows: {
for: { in: 'Rows' },
/* Explicitly override the server data reduction to make it appropriate for matrix. */
dataReductionAlgorithm: { window: { count: 500 } }
},
columns: {
for: { in: 'Columns' },
/* Explicitly override the server data reduction to make it appropriate for matrix. */
dataReductionAlgorithm: { top: { count: 100 } }
},
values: {
for: { in: 'Values' }
}
}
}],
I need some basic assistance with a Highmap (via Highcharts) I am trying to put in my Rails 4 app. I suspect I have some fundamental misunderstanding of it but can't find any clear guidance.
See a simple fiddle taken from the documentation, here
http://jsfiddle.net/SimonWalsh/zpdc1btu/
What I ultimately need to do is provide membership numbers for each country so that it will be displayed much the same as the population density is in this map.
I know I need to provide my data and the means to join it to the map data in
series : [{
data : data,
mapData: Highcharts.maps['custom/world'],
joinBy: ['iso-a2', 'code'],
name: 'Population density',
states: {
hover: {
color: '#BADA55'
}
}
}]
In this example, I am guessing that the data is being pulled from an external source and that the map data is the 'iso-a2' part of the array.
If this is the case, then why can't I supply this with my data....as an example see the added array with my data.....(just one example given for Denmark)
var mydata = [
{
"iso-a2": "dk",
"value": 30
},
]
and then do
series : [{
data : mydata,
mapData: Highcharts.maps['custom/world'],
joinBy: ['iso-a2', 'value'],
name: 'Population density',
states: {
hover: {
color: '#BADA55'
}
}
}]
This does not work.....any guidance at all (other than simply pointing me to docs would be greatly appreciated)
The joinBy specifies on which value you map a country with your data. With
joinBy: ['iso-a2', 'code']
you say that the 'iso-a2' value of the mapData should be equal to the 'code' value of your data. Therefore, your data must have this format:
var mydata = [
{
"code": "dk",
"value": 30
},
/* ... */
]