How to use sf cartesian chart to automatically calculate y-axis range - flutter

I want to create a line chart with a list of CoinData with SfCartesian Chart in flutter and I want the chart to automatically make the starting point of the y-axis the lowest number provided and the highest number to be the highest number provided. I looked through the docs https://help.syncfusion.com/flutter/cartesian-charts/axis-customization , and the closest thing I could find was the property anchorRangeToVisiblePoints: false or manually setting the property visibleMinimum and visibleMaximum but that isn't an option as I would be passing different CoinData prices based on different coins and I can't use the same value for all of them, any idea how I can implement this
For more context, this is the code I am using to test and experiment.
import 'package:flutter/material.dart';
import 'package:syncfusion_flutter_charts/charts.dart';
class Charts extends StatefulWidget {
const Charts({Key? key}) : super(key: key);
#override
_ChartsState createState() => _ChartsState();
}
class _ChartsState extends State<Charts> {
#override
void initState() {
// TODO: implement initState
// _CoinData = getChartData();
super.initState();
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: Container(
height: 267,
child: SfCartesianChart(
primaryYAxis: NumericAxis(isVisible: false,anchorRangeToVisiblePoints: false,),
tooltipBehavior: TooltipBehavior(enable: false),
primaryXAxis: DateTimeAxis(isVisible: false,),
series: <ChartSeries>[
// Renders line chart
LineSeries<CoinData, DateTime>(
dataSource: prices,
xValueMapper: (CoinData sales, _) => sales.year,
yValueMapper: (CoinData sales, _) => sales.sales)
]))));
}
}
class CoinData {
CoinData(int year, this.sales) {
this.year = DateTime.fromMillisecondsSinceEpoch(year).toLocal();
}
late DateTime year;
double sales;
}
List<CoinData> prices = [
CoinData(1642392036421, 42749.711818578595),
CoinData(1642388517068, 42989.70122789917),
CoinData(1642395633127, 42712.08236994989),
CoinData(1642402838825, 42843.846816992016),
CoinData(1642399332413, 42599.83212961661),
CoinData(1642406434920, 42718.431064867356),
CoinData(1642410277789, 42918.18830305879),
CoinData(1642413740231, 42953.704362756995),
CoinData(1642417237341, 42848.42337504775),
CoinData(1642420853261, 42787.2565709712),
CoinData(1642424533130, 42666.07903883221),
CoinData(1642428022319, 42682.25091040553),
CoinData(1642431666253, 42706.84109519157),
CoinData(1642435475100, 42554.380859461504),
CoinData(1642438853722, 42288.63596857892),
CoinData(1642442594070, 42117.89357566385),
CoinData(1642446293756, 42292.17977430048),
CoinData(1642449728774, 42331.65604621167),
CoinData(1642453270106, 42213.655228582276),
CoinData(1642456918900, 41756.89208374346),
CoinData(1642460477923, 42346.541012394795),
CoinData(1642464161403, 42311.13096812778),
CoinData(1642468369285, 42420.84387886949),
CoinData(1642471295036, 42305.94587540152),
CoinData(1642474865285, 42310.62962338389),
CoinData(1642478466863, 42073.464694362105),
CoinData(1642482191362, 42104.48450429597),
CoinData(1642485765736, 42243.993380507665),
CoinData(1642489204082, 42415.20222337461),
CoinData(1642492943052, 42085.76408393512),
CoinData(1642496567754, 41774.58393396233),
CoinData(1642500099392, 42055.251604425226),
CoinData(1642503653184, 42058.93212053518),
CoinData(1642507342334, 41843.44735603253),
CoinData(1642510959133, 41889.82064061213),
CoinData(1642514481569, 41727.002021779736),
CoinData(1642518077038, 41356.61112815827),
CoinData(1642521723376, 41702.56259168864),
CoinData(1642525337159, 41796.53046970178),
CoinData(1642528983594, 41550.28411391625),
CoinData(1642532466377, 41716.19509209493),
CoinData(1642536297311, 41812.879241771945),
CoinData(1642539721904, 41741.91803252099),
CoinData(1642543231985, 42498.18123135277),
CoinData(1642546837453, 42498.47853946216),
CoinData(1642550473450, 42395.45879157343),
CoinData(1642554229144, 42332.290976869364),
CoinData(1642557774831, 42454.98929665433),
CoinData(1642561329780, 42334.4404296046),
CoinData(1642564980424, 41779.01270893919),
CoinData(1642568497700, 41820.97346316072),
CoinData(1642572157122, 41778.45401628946),
CoinData(1642575888262, 41781.40839917395),
CoinData(1642579246250, 41265.005495175465),
CoinData(1642582988822, 41325.06579035713),
CoinData(1642586541303, 41658.36261134919),
CoinData(1642590063989, 41455.42789267524),
CoinData(1642593802287, 42111.015879629755),
CoinData(1642597245462, 42194.35952948134),
CoinData(1642600921347, 42201.65536625609),
CoinData(1642604564168, 42652.55815588597),
CoinData(1642608225687, 42014.03261432062),
CoinData(1642611838743, 41969.260501867146),
CoinData(1642615253442, 42134.455770558474),
CoinData(1642619019192, 42025.43482944683),
CoinData(1642622544973, 41968.95038082978),
CoinData(1642626078457, 41618.25322218039),
CoinData(1642629658614, 41817.745577805385),
CoinData(1642633358721, 42035.87953978328),
CoinData(1642636805471, 41749.55143098559),
CoinData(1642641169518, 41907.06638025352),
CoinData(1642644119959, 41813.24412079334),
CoinData(1642647699541, 42072.19957608677),
CoinData(1642651295109, 41995.408525918814),
CoinData(1642654929816, 41969.901994013315),
CoinData(1642658514025, 41923.96890233066),
CoinData(1642662252361, 42064.208021444596),
CoinData(1642665773630, 42113.0463479793),
CoinData(1642669406880, 41964.771542199494),
CoinData(1642672807732, 42153.83194877708),
CoinData(1642676524869, 42155.166974090964),
CoinData(1642680057034, 42210.41697932467),
CoinData(1642683741769, 42078.59816595068),
CoinData(1642687252649, 42457.09178193016),
CoinData(1642690904488, 43120.58908265619),
CoinData(1642694609592, 43308.03956681778),
CoinData(1642698105291, 43299.353057524866),
CoinData(1642701608567, 43056.540669581744),
CoinData(1642705247727, 43149.926635185744),
CoinData(1642708911675, 42946.95943008196),
CoinData(1642712563338, 42612.93819242102),
CoinData(1642716114837, 41368.03820513283),
CoinData(1642719655169, 41244.72558790132),
CoinData(1642723259219, 40707.6824143097),
CoinData(1642726814802, 41011.486226241585),
CoinData(1642730438307, 39502.20976924315),
CoinData(1642734045516, 40005.428327993286),
CoinData(1642737632525, 38595.357998473075),
CoinData(1642741374260, 38972.1426142197),
CoinData(1642744931144, 39069.60851847918),
CoinData(1642748534002, 38825.08225149761),
CoinData(1642752138990, 39285.10057661805),
CoinData(1642755972492, 39282.13205482304),
CoinData(1642759231219, 39146.98486305409),
CoinData(1642762897123, 39029.01940763461),
CoinData(1642766505275, 38972.112801224925),
CoinData(1642770171389, 37978.94600196123),
CoinData(1642773639856, 38683.65020437281),
CoinData(1642777278422, 38477.708224151065),
CoinData(1642780809533, 39161.402329147226),
CoinData(1642784572974, 38684.34956161961),
CoinData(1642788115113, 38357.71969772329),
CoinData(1642791689302, 38555.043969645936),
CoinData(1642795342047, 38203.1890035537),
CoinData(1642798814773, 38178.00057195512),
CoinData(1642802402972, 36018.680208090766),
CoinData(1642806110522, 35761.710943672675),
CoinData(1642809848015, 36385.341362730935),
CoinData(1642814471774, 36342.22689553229),
CoinData(1642816873862, 36637.351584595846),
CoinData(1642820548357, 36639.176855482365),
CoinData(1642824152214, 36317.547348304455),
CoinData(1642827750453, 36412.4702263163),
CoinData(1642831381738, 35732.43347988268),
CoinData(1642834948400, 35869.70749858731),
CoinData(1642838429026, 35580.66865547844),
CoinData(1642842379605, 35692.12145599295),
CoinData(1642845602154, 34658.69118169887),
CoinData(1642849332824, 35631.29321200412),
CoinData(1642852860526, 35423.733623564774),
CoinData(1642856436347, 35952.32534384478),
CoinData(1642860031930, 35680.11740179815),
CoinData(1642863977964, 35193.74160008464),
CoinData(1642867200863, 34991.02054654133),
CoinData(1642870885598, 35109.6564826399),
CoinData(1642874429377, 34631.73103161949),
CoinData(1642878479406, 34527.6528378289),
CoinData(1642881707361, 34602.79496883843),
CoinData(1642885302767, 35464.161836675376),
CoinData(1642888839111, 35630.207411484356),
CoinData(1642892552509, 34935.31059784646),
CoinData(1642896166621, 35180.435462830384),
CoinData(1642899604966, 35432.61134395314),
CoinData(1642903362311, 35448.608106994194),
CoinData(1642906830933, 35044.59262923074),
CoinData(1642910508104, 35176.65728559375),
CoinData(1642914151050, 35348.42857530886),
CoinData(1642917659189, 35591.25705774395),
CoinData(1642921325713, 35342.902225939535),
CoinData(1642924951086, 35673.892148853825),
CoinData(1642928575653, 35760.80532005177),
CoinData(1642932210452, 35974.488705639684),
CoinData(1642935648639, 35898.49265417996),
CoinData(1642939382142, 35764.30539081825),
CoinData(1642942855334, 35924.69475847814),
CoinData(1642946608245, 36066.53867510662),
CoinData(1642950193192, 35208.08509273927),
CoinData(1642954326416, 35476.641272607),
CoinData(1642957238487, 35363.39608281859),
CoinData(1642960836652, 35472.73143627676),
CoinData(1642964487734, 35005.57945651765),
CoinData(1642968200712, 34804.560652713786),
CoinData(1642971750755, 35332.049887473404),
CoinData(1642975229876, 35566.67303014184),
CoinData(1642978900086, 35578.38113726986),
CoinData(1642982449012, 36306.409440464704),
CoinData(1642986538625, 35976.423803204576),
CoinData(1642989785208, 35614.40208623434),
CoinData(1642991427000, 35631.47620568353)
];
For more context, this is what I'm trying to create
But this is what I am getting
I do not want it to start from 0, I want it to start from the lowest number like 31,000 or something but I don't want to manually use the property visibleMinimum and visibleMaximum to set the range, as it would be using different coins with different values.


Your requirement can be achieved using the rangePadding property available in the axis. Set the range padding as round, this will round off the range for the available data point. We have provided the UG and code snippet below for your reference.
Code snippet:
primaryYAxis: NumericAxis(
rangePadding: ChartRangePadding.round
)
UG: https://help.syncfusion.com/flutter/cartesian-charts/axis-types#applying-padding-to-the-range

Related

iterate through a list of widgets based on a list of objects in a formula

I am trying to display a certain series of widgets based on objects contained in a formula. Here is how I am assigning the widgets to a variable based on their type.
var l = TankFormulaLength(length: tankSpec.tankSpecs.imperialLength);
var w = TankFormulaWidth(width: tankSpec.tankSpecs.imperialWidth);
var h = TankFormulaHeight(height: tankSpec.tankSpecs.imperialHeight);
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Here is where these are being used.
Column(children: <Widget>[
...tankFormula(tankMeasurements,
tankSpec.tankSpecs.formula),
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The formula is pulled from an api call that happens based on a tank specification and is delivered as show below..currently I am printing it to the console so I can see what formula each tank spec is using.
in my tankFormula function, I want to take the specific formula and use it to iterate through my list of widgets and only return the ones specific to the formula. Currently I am able to make all of them show up, because they are not being filtered.
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I am unsure how to get the end result I am looking for. As shown in the screenshot below, I only needs the fields from the formula, 'Length' and 'Diameter', to show up as those are the only ones used in this particular formula for this specific tank specification. In other instances, it could be some of the additional fields i.e. 'Width or 'Height'. Again, based on the formula returned from the API. The additional fields 'Product', 'Tank Capacity', and 'Sensor Offset', will always be displayed.
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Is this perhaps what you're looking for?
Widget build(BuildContext context) {
return Column(
children: [
if (list.contains('l')) TankFormulaLength(),
if (list.contains('h')) TankFormulaHeight(),
if (list.contains('w')) TankFormulaWidth(),
if (list.contains('d')) TankFormulaDiameter(),
],
);
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var list = ['l', 'h', 'w', 'd'];

The solution by "void void" is perfectly legit. If you want, for some reason, to iterate over the list, then this is a separate approach.
return Column(
children: list.map<Widget>((e) {
switch(e) {
case 'l': return TankFormulaLength(...);
case 'h': return TankFormulaHeight(...);
case 'w': return TankFormulaWidth(...);
case 'd': return TankFormulaDiameter(...);
}
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Here is how I solved this problem. Because I was receiving a specific value from the api for each portion of the formula I needed to make sure I was passing that down to my custom widget through the function I had created and then checking to see which variables the formula contains.
List<Widget> tankFormula(l, w, h, d, formula) {
List<Widget> calculatedFormula = [];
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calculatedFormula.add(TankFormulaLength(length: l));
}
if (formula.contains('w')) {
calculatedFormula.add(TankFormulaWidth(width: w));
}
if (formula.contains('h')) {
calculatedFormula.add(TankFormulaHeight(height: h));
}
if (formula.contains('d')) {
calculatedFormula.add(TankFormulaDiameter(diameter: d));
}
print(formula);
return calculatedFormula;
}

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From the plugins constructor
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