[BUG] Bar Chart incorrect rendering for special data

[liuxuan30]

Here's what I changed in - (void)setDataCount:(int)count range:(double)range for the demo multiple bar chart view controller, other remains the same:

- (void)setDataCount:(int)count range:(double)range
{
    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;
}

It render the second group of bars at xIndex:10 in a wrong postion. The correct postion should be at the right most position, since the second group is at xIndex 10 as the last data entry.

[liuxuan30]

I was told not to insert nil/NAN value at specific xIndex. So my data only has value at xIndex:0 and xIndex:10. However, the _deltaX is using entryCount to calculate, and it goes wrong.

I found at least two functions is using entryCount: BarChartView->calMinMax() and BarChartViewRenderer->drawDataSets()

I have to temporarily choose to insert nan into the dataSet, and handle the nan situation myself (it crashes from time to time if no nan check).

the mis-rendered bars cannot be highlighted by touch.

I think it's a serious bug @danielgindi

[liuxuan30]

Tried one fix #221 for bar chart. Other bar-like chart not touched yet, as I need @danielgindi to confirm if my fix is correct. Then we can take a look at other bar-like charts.

[ghizoulo]

I am using v3.0.1 but still have the same problem. the bars are misplaced. Please if u can help me with that check #3154