the text rotation （Cry for help）

[931743010]

old lable：

new lable effect：

how to rotate the label to Stand up to see more dates.

it‘s best to give a demo.

[danielgindi]

Duplicate #61

If you want to rush this - you can give it a try implementing this yourself. Basically you need to rotate the CG matrix before drawing, and you need to rotate it also when calculating the "longest label width" - to consider the angle.

[liuxuan30]

I tried once, but seems I missed something, I rotate the text and the text is gone... Must miss something like anchor point

[danielgindi]

I have just implemented this. Cheers :-)

(And yes, it was a lot of sitting with a pen, drawing bounds and angles, and figuring out what goes where...)

[931743010]

Thank you so much for yours attention to this problem. i Look forward to ，haha

[liuxuan30]

woooooow can't wait it and learn another lesson! The matrix is killing me :)

[danielgindi]

The headache here is the anchor points. You want to draw the text rotated
around its center, and align left/right only the outer box which encloses
the rotated label. So you have virtually two anchor point.

When I'll add multiline support to horizontal chart's axis labels, I'll
need to be able to specify text alignment, and compensate for that in all
that math- which I think affects Android only because it changes the
drawing anchor point according to the alignment property...