Power BI Sparkline Line.DAX

Sparkline Line = 

// Static line color - use %23 instead of # for Firefox compatibility
VAR LineColor = "%2301B8AA"

// "Date" field used in this example along the X axis
VAR XMinDate = MIN('Table'[Date])
VAR XMaxDate = MAX('Table'[Date])

// Obtain overall min and overall max measure values when evaluated for each date
VAR YMinValue = MINX(VALUES('Table'[Date]),CALCULATE([Measure Value]))
VAR YMaxValue = MAXX(VALUES('Table'[Date]),CALCULATE([Measure Value]))

// Build table of X & Y coordinates and fit to 100 x 100 viewbox
VAR SparklineTable = ADDCOLUMNS(
    SUMMARIZE('Table','Table'[Date]),
        "X",INT(100 * DIVIDE('Table'[Date] - XMinDate, XMaxDate - XMinDate)),
        "Y",INT(100 * DIVIDE([Measure Value] - YMinValue,YMaxValue - YMinValue)))

// Concatenate X & Y coordinates to build the sparkline
VAR Lines = CONCATENATEX(SparklineTable,[X] & "," & 100-[Y]," ", [Date])

// Add to SVG, and verify Data Category is set to Image URL for this measure
VAR SVGImageURL = IF(HASONEVALUE('Table'[Category]),
    "data:image/svg+xml;utf8," & 
    "<svg xmlns='http://www.w3.org/2000/svg' x='0px' y='0px' viewBox='0 0 100 100'>" &
     "<polyline fill='none' stroke='" & LineColor & 
     "' stroke-width='3' points='" & Lines & 
     "'/></svg>",
     BLANK())
RETURN SVGImageURL

@powerlars, late but I see you asked the same thing I figured out today. I simply added a column with a day ordinal in my date dimension:
DataDay = 'Date'[Date]-MIN('Date'[Date])
After that, each granular level can be chosen (in the example below it's by quarter) and properly spaced:

VAR GraphData=
	SUMMARIZE(
    	FILTER(VALUES('Date'[Calendar Year Quarter Number]),[Sales Amount]>0)
    	, 'Date'[Calendar Year Quarter Number]
    	, "DayNumber", MIN('Date'[DataDay])
    	,"Sales Amount", [Sales Amount]
    )
VAR XMin=MINX(GraphData, [DayNumber])
VAR XMax=MAXX(GraphData, [DayNumber])
VAR YMin=MINX(GraphData, [Sales Amount])
VAR YMax=MAXX(GraphData, [Sales Amount])
VAR LineData=ADDCOLUMNS(
	GraphData,
	"X",INT(100*DIVIDE([DayNumber]-XMin,XMax-XMin)),
	"Y",INT(100*DIVIDE([Sales Amount]-YMin,YMax-YMin))
)
VAR Lines = CONCATENATEX(LineData,[X] & "," & 100-[Y]," ", [Calendar Year Quarter Number])