D-13

v-3.2.0
---
1. again => sine curve

    ==> done
D-13

v-3.2.1-1
---
1. again => sine curve
2. Editing the codes

    ==> done
D-13

v-3.2.1-2
---
1. inttroduce => padding

    ==> done
D-13

v-3.2.1-2
---
1. tick_Theta => use Math.PI

    ==> done