* display current time&value in chart
* cleanup
* use macro
* use BrightText
* use x-square
* tiplabel: set point size 9
* add 1 point offset
* change Light color
* lighter color
* use const iterator to avoid implict sharing detachs
old-commit-hash: 45f1f764ea32f05b51e8e8a84ab6ce7ab8eefd95