About Auto-scaling on axis

[kscorpio]

1 about y
i use the newest release 2.1.2
i find Auto-scaling y axis' min/max
but when set autoScaleMinMaxEnabled=YES, the y scaleling range is decided by the points which can be seen in the screen, not by the dataset y values,
so when i move a point out of the screen , the y axis will change suddenly；

2 about x

x cant move to the value which is out of the dataset.xvalue， the first and last point is limits

how can the chart move freely&infinitely in x y direction ??

[liuxuan30]

for Q1, I am not sure what's your problem. the yaxis changes if needed.. I suppose

for Q2, I guess you can't... once it reaches the min/max index on x axis, it will stop scrolling. But you could try insert many xIndex and don't insert dataEntry for these xIndex... But it's too hacky and I won't try it for performance issue :-) Also I don't think it makes sense to scroll infinitely

Chart is to provide better readabilty about data, not a playground.

[kscorpio]

Q1: e.g. y:{ 0,1,2,3,4,5,6,7} ,y is from 0 to 7, reset the scale to make point { 0,1,2,3} can be seen in the screen , now the yaxis disctance is from 0-3,

but when move the line in xaxis , the yaxis disctance will jump to 0-7, this looks bad in visual .

how to fix this , (notice: the y value is random, so maybe could not set custom x and y value)

[liuxuan30]

I remember when you zoomed in and scroll, the yaxis will calculate its range as needed, so if currently is {0,1,2,3} on screen, when you start to scroll to 4-6, it will calculate the new range, like [0,6]. I don't see it's bad in visual, because you have new points and larger values, if the yAxis keeps in [0,3], and there is a point y:6, if you draw this point on [0,3], it is wrong.

[kscorpio]

Maybe you coulg have a try like {0,0,0,0,0,0,0,0,0,0,0,-90,120,-90,120,-90,120,-90,120,-90,......,,0,0,0,}

when scroll between -90 and 120, the yaxis is calulate,and the the scale in y has chaged,

in visual， the line is zooming in y direction or flicker

so move in x direction lead to yaxis zoom

[AlBirdie]

I don't really understand your problem here. Could you maybe make a video of your issue in order to illustrate it better?

Anyway, I just found a bug with the autoscaling myself. It occasionally happens, that the x axis is being moved when autoscaling is enabled, which shouldn't be the case. I have yet to find the origin of that issue, but this could be a tricky one...

[kscorpio]

http://pan.baidu.com/s/1c0jm788
http://pan.baidu.com/s/1c00N1KW

i‘m not sure if you can open the video successfuly

[AlBirdie]

Nope, doesn't load without some sort of login, I suppose.

[kscorpio]

can not download？

[kscorpio]

https://drive.google.com/file/d/0Byf7w2vTse3Qd1F3ZXI2MGozUlE/view?usp=sharing
https://drive.google.com/file/d/0Byf7w2vTse3QZkRlbEhpRjNEM1U/view?usp=sharing

https://youtu.be/kEm-YDSs08o
https://www.youtube.com/watch?v=XvRw5dCAczw

[danielgindi]

The chart can not move "infinitely in any direction", as it is not video game, its a view that is supposed to view a chart. So you can scale and drag to the edges of the chart.

About "auto-scaling" feature:
It is meant for the exact behaviour you are seeing. It scales the yAxis to the points currently visible (on the visible on the xAxis range).
If you want the min/max visible yAxis range to be according to the whole dataset - just disable the auto-scaling feature. Which is disabled by default.

[kscorpio]

if disable the auto-scaling ，how to set the y min/max dynamicly ， when add new point to the line and the new value maybe bigger than the point existed？

[danielgindi]

I think you should just reset the scaleY of the viewportHandler to 1.0

[kscorpio]

setScaleMinima:0 scaleY:1.0 ??

or which method?

---

when add a new point to line , i change the customMaxValue and minvalue ,but it does`t work

[WushuputiGH]

Hi, kscorpio 你是否解决了关于自动调节高度， 出现突然跳动的问题

[pmairoldi]

Please keep the conversation in English if possible. It is more accessible for most people. Thanks.