Add option to draw an "average" line

[ManuelRiegler]

First, a big thanks for this great lib... helps a lot!!

I would be nice to have the option to draw a "average" line (average value from all data values) in a different color.

[Boris-Em]

Hi @AskinOharis,
I'm glad you enjoy using BEMSimpleLineGraph!
It seems like this issue is a duplicate of #40. If so, please close this issue. If not, could you explain a little bit more what do you expect exactly with this average line?
Thank you!

[ManuelRiegler]

I don´t think its a dublicate ..what I mean is to go through the arrayOfPoints, calculate the average value and draw this as straight line into the graph.

somthing like this in BEMLine.h:

  UIBezierPath *averageLinesPath = [UIBezierPath bezierPath];
    averageLinesPath.lineCapStyle = kCGLineCapButt;
    if (self.enableAverageLine) {
        double sum = 0.0f;
        for (NSNumber *point in self.arrayOfPoints) {
            sum += [point floatValue];
        }

        double pos =  sum/self.arrayOfPoints.count;
        [averageLinesPath moveToPoint:CGPointMake(0, pos)];
        [averageLinesPath addLineToPoint:CGPointMake(self.frame.size.width, pos)];
    }

I am totally sorry ..I cant contribute it by myself, due to hard lack of time...

[Sam-Spencer]

@AskinOharis Are you looking for an average line (straight horizontal line at the avg. y-value), or are you looking for a trend line? From your code it looks like you want an average line? A trend line would be more complicated (but IMO more useful).

[cheewee2000]

similar to this, being able to draw a zero line would be super useful for me.

[jasonmcdermott]

+1 for a trend line

[Sam-Spencer]

Average lines are finally here!! Use the new averageLine property on BEMSimpleLineGraph to setup and draw an average line. Trend lines are still not available, but are definitely planned.

Documentation is available for average lines on the wiki (the implementation is an approach brand-new to BEMSimpleLineGraph). Plus the sample app should have sufficient explanation.

Cheers! 🎉

AverageLine not found in BEMSimpleLineGraph(ver 3.3) which was installed via Cocoapods(ver 0.36.4):

but found in which was downloaded directly from Github:

Please help Checking.(or you'd update pod version only after the formal release of 4.0?)

[Sam-Spencer]

@emergencyhug Version 4.0 has finally been released and is now available on Cocoa Pods.