用QT来实现简单的画图

[{"title":"（ 53 个子文件 2.01MB ） 用QT来实现简单的画图","children":[{"title":"MyPaint_hxj","children":[{"title":"MyPaint.pro.user <span style='color:#111;'> 18.14KB </span>","children":null,"spread":false},{"title":"main.cpp <span style='color:#111;'> 177B </span>","children":null,"spread":false},{"title":"ui_help.h <span style='color:#111;'> 2.93KB </span>","children":null,"spread":false},{"title":"ui_Mypaint.h <span style='color:#111;'> 14.25KB </span>","children":null,"spread":false},{"title":"help.h <span style='color:#111;'> 308B </span>","children":null,"spread":false},{"title":"Mypaint.h <span style='color:#111;'> 3.21KB </span>","children":null,"spread":false},{"title":"rec.qrc <span style='color:#111;'> 817B </span>","children":null,"spread":false},{"title":"Mypaint.cpp <span style='color:#111;'> 17.47KB </span>","children":null,"spread":false},{"title":"Makefile.Debug <span style='color:#111;'> 52.18KB </span>","children":null,"spread":false},{"title":"release","children":null,"spread":false},{"title":"textbook.ui.autosave <span style='color:#111;'> 2.44KB </span>","children":null,"spread":false},{"title":"help.ui <span style='color:#111;'> 2.43KB </span>","children":null,"spread":false},{"title":"Makefile.Release <span style='color:#111;'> 52.30KB </span>","children":null,"spread":false},{"title":"Mypaint.ui <span style='color:#111;'> 10.03KB </span>","children":null,"spread":false},{"title":"images","children":[{"title":"ellipse.png <span style='color:#111;'> 504B </span>","children":null,"spread":false},{"title":"清屏.png <span style='color:#111;'> 7.17KB </span>","children":null,"spread":false},{"title":"橡皮檫.png <span style='color:#111;'> 6.06KB </span>","children":null,"spread":false},{"title":"eraser.jpg <span style='color:#111;'> 3.30KB </span>","children":null,"spread":false},{"title":"save.png <span style='color:#111;'> 1.16KB </span>","children":null,"spread":false},{"title":"new1.png <span style='color:#111;'> 852B </span>","children":null,"spread":false},{"title":"lines.png <span style='color:#111;'> 990B </span>","children":null,"spread":false},{"title":"saveas.png <span style='color:#111;'> 971B </span>","children":null,"spread":false},{"title":"SSEC@DR47JH%JD_HYK0R3SX.png <span style='color:#111;'> 548B </span>","children":null,"spread":false},{"title":"6A{2J3B{[]AN67(]3UBJ}06.png <span style='color:#111;'> 573B </span>","children":null,"spread":false},{"title":"save12.png <span style='color:#111;'> 651B </span>","children":null,"spread":false},{"title":"(KB)7_B9)}R7~U}K$NC7WF4.png <span style='color:#111;'> 454B </span>","children":null,"spread":false},{"title":"undo.ico <span style='color:#111;'> 47.92KB </span>","children":null,"spread":false},{"title":"(KB)7_B9)}R7~U}K$NC7WF4 - 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