qt实现读取txt数据并绘制曲线

[{"title":"（ 23 个子文件 47KB ） qt实现读取txt数据并绘制曲线","children":[{"title":"readt-x86","children":[{"title":"file.txt <span style='color:#111;'> 128B </span>","children":null,"spread":false},{"title":"Curves.cpp <span style='color:#111;'> 3.31KB </span>","children":null,"spread":false},{"title":".obj","children":[{"title":"release-shared","children":[{"title":"moc_curves.o <span style='color:#111;'> 11.75KB </span>","children":null,"spread":false},{"title":"CurvesForm.o <span style='color:#111;'> 4.40KB </span>","children":null,"spread":false},{"title":"moc_CurvesForm.o <span style='color:#111;'> 11.00KB </span>","children":null,"spread":false},{"title":"Curves.o <span style='color:#111;'> 6.06KB </span>","children":null,"spread":false},{"title":"main.o <span style='color:#111;'> 11.02KB </span>","children":null,"spread":false}],"spread":true}],"spread":true},{"title":"curves.desktop <span style='color:#111;'> 101B </span>","children":null,"spread":false},{"title":"curves.png <span style='color:#111;'> 3.33KB </span>","children":null,"spread":false},{"title":"curves.pro <span style='color:#111;'> 165B </span>","children":null,"spread":false},{"title":"test.txt <span style='color:#111;'> 13.02KB </span>","children":null,"spread":false},{"title":".moc","children":[{"title":"release-shared","children":[{"title":"moc_curves.cpp <span style='color:#111;'> 3.32KB </span>","children":null,"spread":false},{"title":"moc_CurvesForm.cpp <span style='color:#111;'> 2.58KB </span>","children":null,"spread":false}],"spread":true}],"spread":true},{"title":"curves.h <span style='color:#111;'> 804B </span>","children":null,"spread":false},{"title":"a.txt <span style='color:#111;'> 1.13KB </span>","children":null,"spread":false},{"title":"main.cpp <span style='color:#111;'> 106B </span>","children":null,"spread":false},{"title":"curves <span style='color:#111;'> 44.15KB </span>","children":null,"spread":false},{"title":"Makefile <span style='color:#111;'> 11.74KB </span>","children":null,"spread":false},{"title":"CurvesForm.ui <span style='color:#111;'> 3.27KB </span>","children":null,"spread":false},{"title":"test2.txt <span style='color:#111;'> 14.48KB </span>","children":null,"spread":false},{"title":"build <span style='color:#111;'> 170B </span>","children":null,"spread":false},{"title":".ui","children":[{"title":"release-shared","children":[{"title":"CurvesForm.cpp <span style='color:#111;'> 2.00KB </span>","children":null,"spread":false},{"title":"CurvesForm.h <span style='color:#111;'> 909B </span>","children":null,"spread":false}],"spread":false}],"spread":false}],"spread":false}],"spread":true}]