An Android custom view which let user signing or drawing and it's will be saved to an output stream. The special thing is you can draw a smooth line and the stroke size will change gradually depend on your speed. There are two values you should care about:
- sign:filterWeight="0.2"
- sign:strokeSize="@dimen/signWidth"
- filterWeight : How the stroke size will be changed when user change his finger speed(this value effect on the lowpass filter to mitigate velocity aberrations). You can set this value from 0 -> 1, and figure out which value suit for your app.
- strokeSize : The biggest stroke size when user drawing.
And one more thing : To draw smooth line, I use the floating point number so, it's kind of difficult to optimise the view(ex: using bitwise operators...)
Example :
