Draw_arrow

draw the image point residual with arrow. The GUI just like this:

Name		Name	Last commit message	Last commit date
Latest commit History 4 Commits
Pic0045.txt		Pic0045.txt
Pic0046.txt		Pic0046.txt
Pic0047.txt		Pic0047.txt
README.md		README.md
camera.ico		camera.ico
draw_arrow_general.py		draw_arrow_general.py
draw_arrow_general_widget.py		draw_arrow_general_widget.py
draw_arrow_general_widget.ui		draw_arrow_general_widget.ui
drop_pic.py		drop_pic.py
pic0045.JPG		pic0045.JPG
pic0046.JPG		pic0046.JPG
pic0047.JPG		pic0047.JPG
widget_progress_bar.py		widget_progress_bar.py

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