Grouped columns misplaced #242

JanciP · 2015-07-24T14:44:43Z

Hey, I'm having troubles with grouped bar chart.
My barChartData are following:

x-values (array of dates):
02.júla.15,
23.júla.15,
24.júla.15

dataSets:
ChartDataSet, label: tst, 1 entries:
ChartDataEntry, xIndex: 0, value 0.0,
ChartDataSet, label: tst, 1 entries:
ChartDataEntry, xIndex: 0, value 0.0,
ChartDataSet, label: tst, 1 entries:
ChartDataEntry, xIndex: 0, value 0.0,
ChartDataSet, label: tst, 1 entries:
ChartDataEntry, xIndex: 0, value 0.0,
ChartDataSet, label: tst, 1 entries:
ChartDataEntry, xIndex: 0, value 0.0,
ChartDataSet, label: tst, 1 entries:
ChartDataEntry, xIndex: 1, value 39.0,
ChartDataSet, label: tst, 1 entries:
ChartDataEntry, xIndex: 2, value 16.0,
ChartDataSet, label: tst, 1 entries:
ChartDataEntry, xIndex: 2, value 28.0

This produces almost correct result, however bars seems to have wrong position as showed in this image http://imgur.com/Vq43QFH

What am I doing wrong? :)

JanciP · 2015-07-24T16:26:31Z

I've found out that adding another BarChartData for different x-cooridnate creates this Data for other indexes as well... that's why everything is moved by some offset, but I have not idea how fix it.

Data:
BarChartDataEntry *entry = [[BarChartDataEntry alloc] initWithValues:@[@1] xIndex:0];
BarChartDataEntry *entry2 = [[BarChartDataEntry alloc] initWithValues:@[@4] xIndex:0];

BarChartDataSet *set = [[BarChartDataSet alloc] initWithYVals:@[entry] label:@"tst"];
BarChartDataSet *set2 = [[BarChartDataSet alloc] initWithYVals:@[entry2] label:@"tst"];

BarChartDataEntry *entry4 = [[BarChartDataEntry alloc] initWithValues:@[@4] xIndex:2];
BarChartDataSet *set4 = [[BarChartDataSet alloc] initWithYVals:@[entry4] label:@"tst"];

NSArray *tstArr = @[set,set2, set4];

BarChartData *data = [[BarChartData alloc] initWithXVals:xVals dataSets:tstArr];
self.chart.data = data;

Produces this (note the "highlighted column that shouldn't even exist for that index):
http://imgur.com/TlJuonl

danielgindi · 2015-07-26T11:28:34Z

Did you add the xIndexes?

JanciP · 2015-07-26T18:37:29Z

Yes, there are 3 x-indexes (timestamps)
<__NSArrayM 0x7a897960>(
02.júla.15,
23.júla.15,
24.júla.15
)

danielgindi · 2015-07-27T04:48:01Z

You need to attach a screenshot or a working sample project

JanciP · 2015-07-27T07:47:22Z

Ok, while using HorizontalBarChartView and using this array as a X-data:
xVals = <__NSArrayM 0x7a897960>(
02.júla.15,
23.júla.15,
24.júla.15
)

and this as a dataSets:
BarChartDataEntry *entry = [[BarChartDataEntry alloc] initWithValue:1 xIndex:0];
BarChartDataEntry *entry2 = [[BarChartDataEntry alloc] initWithValue:4 xIndex:0];
BarChartDataSet *set = [[BarChartDataSet alloc] initWithYVals:@[entry] label:@"test1"];
BarChartDataSet *set2 = [[BarChartDataSet alloc] initWithYVals:@[entry2] label:@"test2"];

BarChartDataEntry *entry3 = [[BarChartDataEntry alloc] initWithValues:@[@6] xIndex:1];
BarChartDataEntry *entry4 = [[BarChartDataEntry alloc] initWithValues:@[@7] xIndex:1];
BarChartDataSet *set3 = [[BarChartDataSet alloc] initWithYVals:@[entry3] label:@"test3"];
BarChartDataSet *set4 = [[BarChartDataSet alloc] initWithYVals:@[entry4] label:@"test4"];

NSArray *tstArr = @[set,set2,set3,set4];

BarChartData *data = [[BarChartData alloc] initWithXVals:xVals dataSets:tstArr];
[data setValueFont:[UIFont fontWithName:@"HelveticaNeue-Light" size:10.f]];
data.groupSpace = 0.8;
self.chart.data = data;

Produces this graph, (note the "selected" gray column with value 1, which shouldn't exist for that index): http://imgur.com/Cmt0QtM

danielgindi · 2015-07-27T08:05:25Z

It seems to be a highlight bug, when the x axis is reversed.
Could you try with latest version (2.1.2)

@PhilJay did you notice this?

JanciP · 2015-07-27T08:34:14Z

I updated the library, (changed x-values to array ("1","2","3"). Placement of bars is wrong, however now it doesn't repeat the values (I can only "highlight" 6 and 7 bars in "2" index as shown on screenshot - http://imgur.com/J2qEM47).

liuxuan30 · 2015-07-27T08:41:56Z

@danielgindi though I don't fully understand this issue, but it sounds like it is related to issue #214? I got a PR for it. BTW, I don't see the x axis is reversed?

@JanciP, if possible that you are familiar with the code, can you try if #221 fix your issue?

JanciP · 2015-07-27T09:30:09Z

@liuxuan30 I'm not very familiar with the code, however I looked at your files and modified mine accordingly but the issue is still present. Bars are still drawn at wrong place.

I've tried adding datas for every x-value. This is what it looks like : with #221 implemented http://imgur.com/2bdCjsb

danielgindi · 2015-07-27T09:31:43Z

Try to invert the xaxis see if it still happens

On Mon, Jul 27, 2015 at 12:30 PM, JanciP notifications@github.com wrote:

@liuxuan30 https://github.com/liuxuan30 I'm not very familiar with the
code, however I looked at your files and modified mine accordingly but the
issue is still present. Bars are still drawn at wrong place.

I've tried adding datas for every x-value. This is what it looks like :
with #221 #221
implemented http://imgur.com/2bdCjsb

—
Reply to this email directly or view it on GitHub
#242 (comment)
.

JanciP · 2015-07-27T09:35:09Z

@danielgindi you mean using barchart class instead of horizontal bar chart?

danielgindi · 2015-07-27T09:37:13Z

No, I mean setting "inverted" on the axis

JanciP · 2015-07-27T09:40:40Z

With leftAxis.inverted = YES; it still unfortunately happens :( (ChartYAxis *leftAxis = self.chart.leftAxis;)

liuxuan30 · 2015-07-27T10:31:35Z

@danielgindi I think I can confirm it is same issue as #214, only that I am dealing with bar chart, but this is horizontal bar chart, which I don't change yet. It is reproducible on bar chart and horizontal bar chart with same dataSets.

@JanciP do you change the horizontal bar chart code like mine, not in bar chart code? It should take effect. Anyway, I have pushed code for horizontal bar chart at #221 . Please try it. Make sure you change the correct file for horizontal bar chart.

After I apply my potential fix, I got the screenshot, it seems render and highlight OK, but I am guessing shouldn't the bars be center aligned in their x axis zone? I touched nothing about the alignment.

dataSet code:

- (void)setDataCount:(int)count range:(double)range
{
    NSMutableArray *xVals = [[NSMutableArray alloc] init];
    xVals = @[@"jan",@"feb",@"mar"];
    BarChartDataEntry *entry = [[BarChartDataEntry alloc] initWithValue:1 xIndex:0];
    BarChartDataEntry *entry2 = [[BarChartDataEntry alloc] initWithValue:4 xIndex:0];
    BarChartDataSet *set = [[BarChartDataSet alloc] initWithYVals:@[entry] label:@"test1"];
    BarChartDataSet *set2 = [[BarChartDataSet alloc] initWithYVals:@[entry2] label:@"test2"];

    BarChartDataEntry *entry3 = [[BarChartDataEntry alloc] initWithValues:@[@6] xIndex:1];
    BarChartDataEntry *entry4 = [[BarChartDataEntry alloc] initWithValues:@[@7] xIndex:1];
    BarChartDataSet *set3 = [[BarChartDataSet alloc] initWithYVals:@[entry3] label:@"test3"];
    BarChartDataSet *set4 = [[BarChartDataSet alloc] initWithYVals:@[entry4] label:@"test4"];

    NSArray *tstArr = @[set,set2,set3,set4];

    BarChartData *data = [[BarChartData alloc] initWithXVals:xVals dataSets:tstArr];
    [data setValueFont:[UIFont fontWithName:@"HelveticaNeue-Light" size:10.f]];

    _chartView.data = data;
}

liuxuan30 · 2015-07-27T10:58:39Z

Alright I figured out the alignment problem.

@JanciP, I am not sure if it is your issue or the ios-chart duty to handle, but if there are two bars in one group, there should be only two dataSets, not 4, and each dataSet has two dataEntries. What you are using has 4 dataSets, and it leads to more space left for each x axis zone, that's why it is not centered.

Try below code:

    NSMutableArray *xVals = [[NSMutableArray alloc] init];
    xVals = @[@"jan",@"feb", @"mar"];
    BarChartDataEntry *entry = [[BarChartDataEntry alloc] initWithValue:1 xIndex:0];
    BarChartDataEntry *entry2 = [[BarChartDataEntry alloc] initWithValue:4 xIndex:0];

    BarChartDataEntry *entry3 = [[BarChartDataEntry alloc] initWithValue:6 xIndex:1];
    BarChartDataEntry *entry4 = [[BarChartDataEntry alloc] initWithValue:7 xIndex:1];

    BarChartDataSet *set = [[BarChartDataSet alloc] initWithYVals:@[entry,entry3] label:@"test1"];
    BarChartDataSet *set2 = [[BarChartDataSet alloc] initWithYVals:@[entry2,entry4] label:@"test2"];
    //    BarChartDataSet *set3 = [[BarChartDataSet alloc] initWithYVals:@[entry3] label:@"test3"];
    //    BarChartDataSet *set4 = [[BarChartDataSet alloc] initWithYVals:@[entry4] label:@"test4"];

    NSArray *tstArr = @[set,set2];

    BarChartData *data = [[BarChartData alloc] initWithXVals:xVals dataSets:tstArr];
    [data setValueFont:[UIFont fontWithName:@"HelveticaNeue-Light" size:10.f]];

    _chartView.data = data;

Screen shot on my side based on #221

danielgindi · 2015-07-27T11:04:39Z

Yes that's definitely a problem with your code

liuxuan30 · 2015-07-27T11:14:35Z

about the alignment, I think it's @JanciP problem. but for the position, it's ours. I think I broke my PR by merging from upstream master... I will try figure a way later.

danielgindi · 2015-07-27T12:38:00Z

What do you mean by position? The new screenshot looks good

liuxuan30 · 2015-07-27T12:46:36Z

@danielgindi take a look at #214 , same issue for bar+horizontal bar chart. I got PR #221 for it.

It renders the bars at wrong position, if some xIndex don't have entries. To be exact, the xValsCount is not equal to entryCount in each dataSet. This will lead to wrong position.

Very simple to reproduce... just paste the above dataSet code to the chart demo, you will see wrong position and wrong highlight...

danielgindi · 2015-07-27T12:49:47Z

Well the code above looks good, with a valid screenshot. I think you are referring to the code in the other issue?

liuxuan30 · 2015-07-27T13:02:02Z

This is the test dataSet code I used before, it render at wrong position and highlight for second group is failed.

    NSMutableArray *xVals = [[NSMutableArray alloc] init];
    for (int i = 0; i < 11; i++)
    {
        [xVals addObject:[@(i + 2015) stringValue]];
    }
    NSMutableArray *yVals1 = [[NSMutableArray alloc] init];
    NSMutableArray *yVals2 = [[NSMutableArray alloc] init];

    for (int i = 0; i < 11; i++)
    {
        if (i == 0) {
            [yVals1 addObject:[[BarChartDataEntry alloc] initWithValue:2354235 xIndex:i]];
            [yVals2 addObject:[[BarChartDataEntry alloc] initWithValue:3354235 xIndex:i]];
        } else if (i == 10) {
            [yVals1 addObject:[[BarChartDataEntry alloc] initWithValue:6354235 xIndex:i]];
            [yVals2 addObject:[[BarChartDataEntry alloc] initWithValue:7354235 xIndex:i]];
        } else {
            continue;
        }
    }

    BarChartDataSet *set1 = [[BarChartDataSet alloc] initWithYVals:yVals1 label:@"Company A"];
    [set1 setColor:[UIColor colorWithRed:104/255.f green:241/255.f blue:175/255.f alpha:1.f]];
    BarChartDataSet *set2 = [[BarChartDataSet alloc] initWithYVals:yVals2 label:@"Company B"];
    [set2 setColor:[UIColor colorWithRed:164/255.f green:228/255.f blue:251/255.f alpha:1.f]];

    NSMutableArray *dataSets = [[NSMutableArray alloc] init];
    [dataSets addObject:set1];
    [dataSets addObject:set2];

    BarChartData *data = [[BarChartData alloc] initWithXVals:xVals dataSets:dataSets];
    data.groupSpace = 0.8;
    [data setValueFont:[UIFont fontWithName:@"HelveticaNeue-Light" size:10.f]];
    _chartView.leftAxis.startAtZeroEnabled = NO;
    _chartView.rightAxis.startAtZeroEnabled = NO;
    _chartView.data = data;

just replace it in multiple bar chart view controller.

JanciP · 2015-07-27T13:05:30Z

@liuxuan30 agree, with your #221 code and advice you provided in last post, it seems to be working. Thank you!

liuxuan30 · 2015-07-27T13:13:54Z

@JanciP you are welcome!

@danielgindi
Below dataSet also can show the problem. I tested again if it is at xIndex 0 & 1 and leaves xIndex 2 without data, it just covered the true problem, so you don't see a problem, because 0 and 1 has all the data to draw. but if it has entries on 0 and 2 not at xIndex 1, it will render at a strange position.

NSMutableArray *xVals = [[NSMutableArray alloc] init];
    xVals = @[@"jan",@"feb", @"mar"];
    BarChartDataEntry *entry = [[BarChartDataEntry alloc] initWithValue:1 xIndex:0];
    BarChartDataEntry *entry2 = [[BarChartDataEntry alloc] initWithValue:4 xIndex:0];

    BarChartDataEntry *entry3 = [[BarChartDataEntry alloc] initWithValue:6 xIndex:2]; // not 1
    BarChartDataEntry *entry4 = [[BarChartDataEntry alloc] initWithValue:7 xIndex:2]; // not 1

    BarChartDataSet *set = [[BarChartDataSet alloc] initWithYVals:@[entry,entry3] label:@"test1"];
    BarChartDataSet *set2 = [[BarChartDataSet alloc] initWithYVals:@[entry2,entry4] label:@"test2"];
    //    BarChartDataSet *set3 = [[BarChartDataSet alloc] initWithYVals:@[entry3] label:@"test3"];
    //    BarChartDataSet *set4 = [[BarChartDataSet alloc] initWithYVals:@[entry4] label:@"test4"];

    NSArray *tstArr = @[set,set2];

    BarChartData *data = [[BarChartData alloc] initWithXVals:xVals dataSets:tstArr];
    [data setValueFont:[UIFont fontWithName:@"HelveticaNeue-Light" size:10.f]];

    _chartView.data = data;

JanciP · 2015-07-27T18:06:41Z

@liuxuan30 based on your code I was able to display graph correctly. But is it also possible to have different number of DataEntries for each data set? Lets say for x:
1: 2 entries
2: 1 entry
3: 5 entries

PhilJay · 2015-07-27T21:15:08Z

I will have to test this on Android, gimme a sec.

PhilJay · 2015-07-27T21:24:03Z

Some words beforehand:

You need to have exactly as many BarDataSet objects as you want values per "same" x-index
Each dataset is not allowed to have more that 1 value per x-index

PhilJay · 2015-07-27T21:33:28Z

I just tested on Android.

The following code:

        ArrayList<String> xVals = new ArrayList<String>();
        xVals.add("1st");
        xVals.add("2nd");
        xVals.add("3rd");
        xVals.add("4th");

        ArrayList<BarEntry> yVals1 = new ArrayList<BarEntry>();
        yVals1.add(new BarEntry(1f, 0));
        yVals1.add(new BarEntry(2f, 1));
        yVals1.add(new BarEntry(3f, 2));
        yVals1.add(new BarEntry(4f, 3));

        ArrayList<BarEntry> yVals2 = new ArrayList<BarEntry>();
        yVals2.add(new BarEntry(5f, 0));
        yVals2.add(new BarEntry(6f, 1));
        yVals2.add(new BarEntry(7f, 2));
        yVals2.add(new BarEntry(8f, 3));

        ArrayList<BarEntry> yVals3 = new ArrayList<BarEntry>();
        yVals3.add(new BarEntry(9f, 0));
        yVals3.add(new BarEntry(10f, 1));
        yVals3.add(new BarEntry(11f, 2));
        yVals3.add(new BarEntry(12f, 3));

        BarDataSet set1 = new BarDataSet(yVals1, "ds1");
        set1.setColor(Color.RED);
        BarDataSet set2 = new BarDataSet(yVals2, "ds2");
        set2.setColor(Color.BLUE);
        BarDataSet set3 = new BarDataSet(yVals3, "ds3");
        set3.setColor(Color.GREEN);

        ArrayList<BarDataSet> dataSets = new ArrayList<BarDataSet>();
        dataSets.add(set1);
        dataSets.add(set2);
        dataSets.add(set3);

        BarData data = new BarData(xVals, dataSets);
        mChart.setData(data);

Produced this result, which looks fine (and expected) to me.

BUT: As soon as you skip values (like the issue-opener does), problems arise that cause the bars to be on places where they don't belong. This is due to the reason that the bar positioning is not determined by the x-index span, but by the number of entries in the dataset, which is wrong.

liuxuan30 · 2015-07-28T02:57:18Z

@PhilJay I know little about Java+android, but based on the commit, looks like we share the same idea to fix. @danielgindi I am not sure If I missed anything somewhere. Please review

JanciP · 2015-07-28T08:34:33Z

Ok so having same amount of objects(y-vals) for each BarDataSet works very well now (as proven by @PhilJay). My question is, would chart display correctly if we are tracking irregular occurences (that means that BarDataSets won't contain same amount of objects?

Code wise I mean something like this

        ArrayList<BarEntry> yVals1 = new ArrayList<BarEntry>();
        yVals1.add(new BarEntry(1f, 0));
        yVals1.add(new BarEntry(2f, 1));
        //no yval for x==2
        yVals1.add(new BarEntry(4f, 3));

        ArrayList<BarEntry> yVals2 = new ArrayList<BarEntry>();
        yVals2.add(new BarEntry(5f, 0));
        //no yvals for x== 1,2,3

        ArrayList<BarEntry> yVals3 = new ArrayList<BarEntry>();
        yVals3.add(new BarEntry(9f, 0));
        yVals3.add(new BarEntry(10f, 1));
        yVals3.add(new BarEntry(11f, 2));
        yVals3.add(new BarEntry(12f, 3));

liuxuan30 · 2015-07-28T08:51:59Z

can you try the code and give screenshot? I think it should work.

Make sure you have 3 dataSets
dataSet looks like:
dataSet 1: 0: 1, 1: 2, 3: 4
dataSet 2: 0: 5
dataSet 3: 0: 9, 1: 10, 2: 11, 3: 12

JanciP · 2015-07-28T09:09:36Z

Irregular datas:

    NSMutableArray *xsVals = [[NSMutableArray alloc] init];
    xsVals = @[@"jan",@"feb", @"mar",@"apr"];
    BarChartDataEntry *entry0 = [[BarChartDataEntry alloc] initWithValue:1 xIndex:0];
    BarChartDataEntry *entry1 = [[BarChartDataEntry alloc] initWithValue:6 xIndex:1];
    BarChartDataEntry *entry3 = [[BarChartDataEntry alloc] initWithValue:2 xIndex:3];


    BarChartDataEntry *entry00 = [[BarChartDataEntry alloc] initWithValue:4 xIndex:0];

    BarChartDataEntry *entry000 = [[BarChartDataEntry alloc] initWithValue:5 xIndex:0];
    BarChartDataEntry *entry111 = [[BarChartDataEntry alloc] initWithValue:6 xIndex:1];
    BarChartDataEntry *entry222 = [[BarChartDataEntry alloc] initWithValue:4 xIndex:2];
    BarChartDataEntry *entry333 = [[BarChartDataEntry alloc] initWithValue:3 xIndex:3];

    BarChartDataSet *set = [[BarChartDataSet alloc] initWithYVals:@[entry0,entry1,entry3] label:@"test1"];
    BarChartDataSet *set2 = [[BarChartDataSet alloc] initWithYVals:@[entry00] label:@"test2"];
    BarChartDataSet *set3 = [[BarChartDataSet alloc] initWithYVals:@[entry000,entry111,entry222,entry333] label:@"test2"];

    NSArray *tstArr = @[set,set2,set3];


    BarChartData *data = [[BarChartData alloc] initWithXVals:xsVals dataSets:tstArr];

Produce this result (gaps in graph).

I guess that this is probably expected result, but is it possible for graph to adjust to those gaps? From real life it would be like running sessions for each day - some days I'll run 3 times, some days I'll run once, or not at all.

liuxuan30 · 2015-07-28T09:26:11Z

Current scheme does not support this. the distance on xAxis is equal. If you are asking making the xAxis not equal distance, It sounds like what you are asking is like #176 and #194.

For the case you mentioned, I think current bar chart is more meaningful, if we squash all the gaps there, it seems not very easy to understand as bar chart. Bar chart has the nature to let people compare among the bars.

JanciP · 2015-07-28T09:27:28Z

Ok @liuxuan30 I undestand, thank you very much for your help. I learned a lot from your posts. Thanks!

Fixes bar charts x-index calculations (Fixes #214 and fixes #242) Specifically when yValues are missing

josman185 · 2017-06-13T20:02:42Z

Hello everybody. I have a question. Prior to my project update I was presenting my charts in a correct position:

But after update to the last version Charts (3.0.2) I'm getting my chart in wrong position:

Does somebody knows why this happens?. Thanks in advance.

PhilJay added a commit to PhilJay/MPAndroidChart that referenced this issue Jul 27, 2015

Fixed issue concerning grouped-barchart (issue ChartsOrg/Charts#242)

6dada9e

liuxuan30 mentioned this issue Jul 28, 2015

try to fix bar chart + Horizontal Bar chart wrong render + highlight position bug for issue #214 and #242. #248

Merged

JanciP closed this as completed Jul 28, 2015

danielgindi added a commit that referenced this issue Jul 30, 2015

Merge pull request #248 from liuxuan30/BarChart+HorizontalBarFix

2177f7d

Fixes bar charts x-index calculations (Fixes #214 and fixes #242) Specifically when yValues are missing

regas99 pushed a commit to regas99/MPAndroidChart that referenced this issue Apr 1, 2019

Fixed issue concerning grouped-barchart (issue ChartsOrg/Charts#242)

c93dc08

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Grouped columns misplaced #242

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Grouped columns misplaced #242

Grouped columns misplaced #242

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