How to retain previous values in graph? QWT

[FelixB]

whether you use "setSamples" or "setRawSamples" has absolutely nothing to do with your timer. did you debug if "timerEvent" gets called?

[maarvi]

thanks alot sir my this problem is solved u are awesome..

but kindly tell me is there a way by which my to points get joined after 10 sec as now my two line get joined after 10 sec
thanks you kindly help me

[FelixB]

I'm sorry, I don't understand what you mean with "join two points". can you explain a bit more detailed?

[maarvi]

sir i mean that i have some points like (0,0) (30, 200) ,(60,150)........ so one i want to plot the graph i want that my graph should appear like moving graph in which joins two points for eg (30,200) to (60 ,150) gradually and then join the next two points

should i have to insert timer in my setSample if yes then how or what else i could do

thanks so much

[FelixB]

that sounds quite complicated. I have no idea how to do that at the moment. is the time between two points fixed? e.g. do you want to reach the next point always after x seconds? or is it dependant of the distance between the points, e.g. very short from (0,0) to (1,1) and very long time from (1,1) to (100,100)?

[maarvi]

sir actually the distance alond x axis is fixed.the interval is 30 but y axis changes. and time should be same no need that for longer distance more time required

thanks