hkay ..
currently I'm using QCharts for my market data and charting
and
I draw a longer time frame fork, say --- Daily first
then
change the time frame to, say --- 60min
QCharts keeps the longer time fork visible, or the portions of it that are visible in the shorter term viewing area
so ..
there is no secret method ..
QCharts does it for me
that is why that sometimes on the shorter time frame charts the points of demarcation for the older forks will be off the exact price by a bit and appear a bit sloppy ...
really it is due to what I call "time parallax" ...
dunno what the actual name is, tho .... ggggg
hope this helps