To achieve a straight line curve, drawing a straight line features such as the arrow is the prototype drawing program

diagramscene_8\diagramscene_8\arrow.cpp
..............\..............\arrow.h
..............\..............\Data.cpp
..............\..............\Data.h
..............\..............\debug\arrow.o
..............\..............\.....\Data.o
..............\..............\.....\diagramitem.o
..............\..............\.....\diagramscene.exe
..............\..............\.....\diagramscene.o
..............\..............\.....\diagramtextitem.o
..............\..............\.....\main.o
..............\..............\.....\mainwindow.o
..............\..............\.....\moc_diagramscene.cpp
..............\..............\.....\moc_diagramscene.o
..............\..............\.....\moc_diagramtextitem.cpp
..............\..............\.....\moc_diagramtextitem.o
..............\..............\.....\moc_mainwindow.cpp
..............\..............\.....\moc_mainwindow.o
..............\..............\.....\moc_Tablewidget.cpp
..............\..............\.....\moc_Tablewidget.o
..............\..............\.....\qrc_diagramscene.cpp
..............\..............\.....\qrc_diagramscene.o
..............\..............\.....\Tablewidget.o
..............\..............\diagramitem.cpp
..............\..............\diagramitem.h
..............\..............\diagramscene.cpp
..............\..............\diagramscene.h
..............\..............\diagramscene.pro
..............\..............\diagramscene.pro.user
..............\..............\diagramscene.qrc
..............\..............\diagramtextitem.cpp
..............\..............\diagramtextitem.h
..............\..............\images\background1.png
..............\..............\......\background2.png
..............\..............\......\background3.png
..............\..............\......\background4.png
..............\..............\......\boat.png
..............\..............\......\bold.png
..............\..............\......\bringtofront.png
..............\..............\......\delete.png
..............\..............\......\engine.png
..............\..............\......\engine2.png
..............\..............\......\floodfill.png
..............\..............\......\italic.png
..............\..............\......\linecolor.png
..............\..............\......\linepointer.png
..............\..............\......\pointer.png
..............\..............\......\sendtoback.png
..............\..............\......\textpointer.png
..............\..............\......\Thumbs.db
..............\..............\......\trans.png
..............\..............\......\underline.png
..............\..............\main.cpp
..............\..............\mainwindow.cpp
..............\..............\mainwindow.h
..............\..............\Makefile
..............\..............\Makefile.Debug
..............\..............\Makefile.Release
..............\..............\note.txt
..............\..............\object_script.diagramscene.Debug
..............\..............\object_script.diagramscene.Release
..............\..............\release\diagramscene.exe
..............\..............\Tablewidget.cpp
..............\..............\Tablewidget.h
..............\..............\tmp\moc\debug_shared\moc_diagramscene.cpp
..............\..............\...\...\............\moc_diagramtextitem.cpp
..............\..............\...\...\............\moc_mainwindow.cpp
..............\..............\...\...\release_shared\moc_diagramscene.cpp
..............\..............\...\...\..............\moc_diagramtextitem.cpp
..............\..............\...\...\..............\moc_mainwindow.cpp
..............\..............\...\obj\debug_shared\arrow.o
..............\..............\...\...\............\diagramitem.o
..............\..............\...\...\............\diagramscene.o
..............\..............\...\...\............\diagramtextitem.o
..............\..............\...\...\............\main.o
..............\..............\...\...\............\mainwindow.o
..............\..............\...\...\............\moc_diagramscene.o
..............\..............\...\...\............\mo

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