Power BI - Line Chart with changing color for trend - powerbi

Question

Just wondering if it's possible to create a chart like below.
I have created the following measures in DAX:
1. [Total Sales]
2. [PM Sale] =
CALCULATE([TotalSales], PARALLELPERIOD('Date'[Date], -1, MONTH)) // Previous month Sales
3. [Indicator] = IF([TotalSales] - [PM Sale] >=0, 1, 0)
4. [IndicatorText] = IF([TotalSales] - [PM Sale] >=0, "UP", "DOWN")
I thought adding the [Indicator] or [IndicatorText] to "Legend" property of line chart would be possible and then be able to change the color, but it is not.
Any ideas?
Thanks,
Shiv

Answer 1

This isn't exactly what you are requesting, but a waterfall chart works pretty well here.
Create a measure to be the difference from the last month and use that for the waterfall chart's y-axis with the date in the category section.
Diff = [Total Sales] - CALCULATE([Total Sales], PARALLELPERIOD('Date'[Date], -1, MONTH))
You can also use a regular bar chart with two series:
Up = IF([Diff] >= 0, [Total Sales], BLANK())
Down = IF([Diff] < 0, [Total Sales], BLANK())
If you convert this to a line chart, it would look like this (you need to set the x-axis to categorical instead of continuous):
It's possible to tweak the measures a bit by looking at the next month in addition to the previous month and get what you want for this particular case, but it won't work correctly in general:
You can't tell from the image, but the first red line segment is covering a green line segment. If red and green segments alternate, then this methodology breaks down.
Here are the adjusted measured for the chart above:
Forward = IF(ISBLANK(PARALLELPERIOD('Date'[Date] , 1, MONTH)),
BLANK(),
CALCULATE([Total Sales]),
PARALLELPERIOD('Date'[Date], 1, MONTH))
- [Total Sales])
Up = IF([Diff] >= 0 || [Forward] >= 0, [Total Sales], BLANK())
Down = IF([Diff] < 0 || [Forward] < 0, [Total Sales], BLANK())