Correct virtual function
test start end
Error Occur
revert
Random Error
Revert 2
f
Revert "Error Occur"

This reverts commit ba901ad13b5cec75ba78f633b39315c1fdb5d967.

Conflicts:
	Assignment1_minipaint_redux/Unit_Tests/test_Line.cpp
a
All Right
Successful drawLine and test
merge from super Albert