QT在Label上畫矩形
阿新 • • 發佈：2019-01-29
一、首先定義一個mylabel.h，繼承於QLabel
#ifndefMYLABEL_H
#defineMYLABEL_H
#include<QLabel>
#include<QMouseEvent>
#include<QPainter>
#include<QPen>
#include<QPoint>
classmylabel:publicQLabel
{
Q_OBJECT
public:
explicitmylabel(QWidget*parent=0);
voidmousePressEvent(QMouseEvent*event);
voidpaintEvent(QPaintEvent*event);
voidmouseReleaseEvent(QMouseEvent*event);
intx1,y1,x2,y2;
signals:
voidclicked();
voidsendData(QString);
publicslots:
voidonClicket();
};
#endif
二、mylabel.cpp檔案
#include"mylabel.h"
#include<QMessageBox>
#include<QString>
mylabel::mylabel(QWidget*parent):
QLabel(parent){connect(this,SIGNAL(clicked()),this,SLOT(onClicket()));
}
voidmylabel::mouseReleaseEvent(QMouseEvent*event)
{x1=0;
x2=0;
y1=0;
y2=0;
update();
}
voidmylabel::mousePressEvent(QMouseEvent*event){
intx=event->x();inty=event->y();//endPnt.x()=startPnt.x()+100;//endPnt.y()=startPnt.y()+100;//if(event->button()==Qt::LeftButton){
//emitclicked();
//}if((x>12&&x<81)&&(y>9&&y<63))
{x1=12;
x2=68;
y1=7;
y2=57;
}
elseif((x>86&&x<155)&&(y>9&&y<63))
{x1=86;
x2=68;
y1=7;
y2=57;
}
elseif((x>160&&x<229)&&(y>9&&y<63))
{x1=163;
x2=68;
y1=7;
y2=57;
}
elseif((x>234&&x<303)&&(y>9&&y<63))
{x1=238;
x2=68;
y1=7;
y2=57;
}
elseif((x>308&&x<377)&&(y>9&&y<63))
{x1=312;
x2=68;
y1=7;
y2=57;
}
elseif((x>382&&x<451)&&(y>9&&y<63))
{x1=388;
x2=68;
y1=7;
y2=57;
}
elseif((x>456&&x<525)&&(y>9&&y<63))
{x1=463;
x2=68;
y1=7;
y2=57;
}
elseif((x>530&&x<599)&&(y>9&&y<63))
{x1=538;
x2=68;
y1=7;
y2=57;
}
elseif((x>604&&x<673)&&(y>9&&y<63))
{x1=613;
x2=68;
y1=7;
y2=57;
}
elseif((x>678&&x<747)&&(y>9&&y<63))
{x1=688;
x2=68;
y1=7;
y2=57;
}
elseif((x>762&&x<853)&&(y>9&&y<63))
{x1=763;
x2=90;
y1=7;
y2=57;
}
elseif((x>60&&x<129)&&(y>72&&y<126))
{x1=62;
x2=68;
y1=68;
y2=57;
}
elseif((x>135&&x<204)&&(y>72&&y<126))
{x1=137;
x2=68;
y1=68;
y2=57;
}
elseif((x>210&&x<279)&&(y>72&&y<126))
{x1=212;
x2=68;
y1=68;
y2=57;
}
elseif((x>285&&x<354)&&(y>72&&y<126))
{x1=287;
x2=68;
y1=68;
y2=57;
}
elseif((x>360&&x<429)&&(y>72&&y<126))
{x1=362;
x2=68;
y1=68;
y2=57;
}
elseif((x>435&&x<504)&&(y>72&&y<126))
{x1=437;
x2=68;
y1=68;
y2=57;
}
elseif((x>510&&x<579)&&(y>72&&y<126))
{x1=512;
x2=68;
y1=68;
y2=57;
}
elseif((x>585&&x<654)&&(y>72&&y<126))
{x1=587;
x2=68;
y1=68;
y2=57;
}
elseif((x>660&&x<729)&&(y>72&&y<126))
{x1=662;
x2=68;
y1=68;
y2=57;
}
elseif((x>735&&x<804)&&(y>72&&y<126))
{x1=737;
x2=68;
y1=68;
y2=57;
}
elseif((x>98&&x<167)&&(y>134&&y<191))
{x1=100;
x2=68;
y1=132;
y2=57;
}
elseif((x>173&&x<242)&&(y>134&&y<191))
{x1=175;
x2=68;
y1=132;
y2=57;
}
elseif((x>248&&x<317)&&(y>134&&y<191))
{x1=250;
x2=68;
y1=132;
y2=57;
}
elseif((x>323&&x<392)&&(y>134&&y<191))
{x1=325;
x2=68;
y1=132;
y2=57;
}
elseif((x>398&&x<467)&&(y>134&&y<191))
{x1=400;
x2=68;
y1=132;
y2=57;
}
elseif((x>473&&x<542)&&(y>134&&y<191))
{x1=475;
x2=68;
y1=132;
y2=57;
}
elseif((x>548&&x<617)&&(y>134&&y<191))
{x1=550;
x2=68;
y1=132;
y2=57;
}
elseif((x>623&&x<692)&&(y>134&&y<191))
{x1=625;
x2=68;
y1=132;
y2=57;
}
elseif((x>698&&x<767)&&(y>134&&y<191))
{x1=700;
x2=68;
y1=132;
y2=57;
}
elseif((x>131&&x<201)&&(y>197&&y<254))
{x1=133;
x2=68;
y1=194;
y2=57;
}
elseif((x>206&&x<276)&&(y>197&&y<254))
{x1=208;
x2=68;
y1=194;
y2=57;
}
elseif((x>281&&x<351)&&(y>197&&y<254))
{x1=283;
x2=68;
y1=194;
y2=57;
}
elseif((x>356&&x<426)&&(y>197&&y<254))
{x1=358;
x2=68;
y1=194;
y2=57;
}
elseif((x>431&&x<501)&&(y>197&&y<254))
{x1=433;
x2=68;
y1=194;
y2=57;
}
elseif((x>506&&x<576)&&(y>197&&y<254))
{x1=508;
x2=68;
y1=194;
y2=57;
}
elseif((x>581&&x<651)&&(y>197&&y<254))
{x1=583;
x2=68;
y1=194;
y2=57;
}
elseif((x>760&&x<854)&&(y>197&&y<254))
{x1=762;
x2=92;
y1=194;
y2=57;
}
update();
QLabel::mousePressEvent(event);
}
/*voidmylabel::paintEvent(QPaintEvent*event)
{QLabel::paintEvent(event);QPainterpaint(this);
paint.setPen(QColor(Qt::red));paint.drawRect(20,20,160,160);}*/voidmylabel::paintEvent(QPaintEvent*event)
{QLabel::paintEvent(event);
QPainterpainter(this);
QPenpen;//設定畫筆，顏色、寬度
pen.setColor(Qt::red);
pen.setWidth(2);painter.setPen(pen);
if(x1>0)
{intxxxx=1;
}
painter.drawRect(x1,y1,x2,y2);
intxxx=1;
}
//可以在這裡向mainwindow主窗體傳送Qstring型別的字串
voidmylabel::onClicket()
{emitsendData("asdklfasljfkldasjkl;fjasl;j");
}
在mainwindows.cpp對mylabel進行connect();