What's the differences between setAxisMaximum and customAxisMax

[kscorpio]

After init a linecharview like this

          _scaleView.delegate = self;  
           _lineChart.descriptionText = @"";
           _lineChart.noDataTextDescription = @"";
           _lineChart.highlightEnabled = YES;
           _lineChart.dragEnabled = YES;
          [_lineChart setScaleEnabled:YES];
           _lineChart.pinchZoomEnabled = NO;

          _lineChart.drawGridBackgroundEnabled = NO;
          _lineChart.legend.position = ChartLegendPositionBelowChartRight;

I find 4 properies :

          [_lineChart.leftAxis setAxisMaximum:200];
          [_lineChart.leftAxis setAxisMinimum:-200];
          _lineChart.leftAxis.customAxisMax = 200;
          _lineChart.leftAxis.customAxisMin = -200;

the _lineChart yAxis is from -1 to +1 and it just can zoom in can not zoom out
and can not zoom and move in x direction
i have run a demo in android , the chat can zoom and move freely

[liuxuan30]

Once you set customAxisMax/Max, it just defines the max range of the axis, so you cannot zoom out I guess if you are not zoomed in first. Because if you try to zoom out the max range, what the range would be is unknown. I don't know android, @PhilJay can you confirm?

axisMaximum/Min is something calculated via computeAxisValues or calcMinMax, so normally you don't have to change this (and shouldn't)

Once you set customAxisMax/Max, axisMax/Min is set to it:

        _yAxis.axisMaximum = !isnan(_yAxis.customAxisMax) ? _yAxis.customAxisMax : maxLeft + Double(topSpaceLeft)
        _yAxis.axisMinimum = !isnan(_yAxis.customAxisMin) ? _yAxis.customAxisMin : minLeft - Double(bottomSpaceLeft)

[kscorpio]

• How to achieve xyAxis zoom in/out infinitely ？
• How to adjust unit length x y， like X:Y =1:3

[kscorpio]

• can the property customAxisMax/min be changed automaticlly ,when i add point to dataset??

[liuxuan30]

I don't believe you can zoom out of the max axis range... But zoom in seems possible to a very small scale, but I never tried it infinitely. What are you trying to do here?

You can try to modify the scaleX/Y to let X:Y = 1:3, I am not very clear about what you needs.

customAxisMax/min means you define the max/min, instead of calculating. When you add point to dataSet, axis max/min are calculated with these values already.

[SvenMuc]

I used the following line of codes to zoom in by programatically for example to show just the min and max value of the data. Nevertheless, I haven't tried whether it is still possible to zoom in/out by the gestures.
Important topic for me was to set the labelCountcorrectly. Otherwise you might get strange steps on the axis.

lineChart.leftAxis.customAxisMin = max(0.0, lineChart.data!.yMin - 1.0)
lineChart.leftAxis.customAxisMax = min(10.0, lineChart.data!.yMax + 1.0)
lineChart.leftAxis.labelCount = Int(lineChart.leftAxis.customAxisMax - lineChart.leftAxis.customAxisMin)
lineChart.leftAxis.startAtZeroEnabled = false

[ricardosousaDev]

For those who find an issue of not having the customAxisMin/Max working, bare in mind that the dataSet should be added to the graph after.