QT：一个简洁的温度自定义控件

最新推荐文章于 2025-06-11 11:42:21 发布

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最新推荐文章于 2025-06-11 11:42:21 发布

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分类专栏： QT 文章标签： QT 自定义控件温度美观

本文链接：https://blog.youkuaiyun.com/qq_33361431/article/details/86551352

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本文介绍了一款基于QT的自定义温度控件，通过简洁的设计实现温度的动态显示与调整。控件采用QT框架，利用QTimer进行定时更新，通过鼠标操作实现温度设定值的平滑变化。

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QT：一个简洁的温度自定义控件

本人学生党一枚~~，写上位机的时候写了个温度控件，新手一枚，欢迎各位大佬指正。
效果图：

工程目录下载

代码

set_tem.c文件

#include "set_tem.h"
#pragma execution_character_set("utf-8")
#include <QPen>
#include <QDebug>
#include <math.h>
set_tem::set_tem(QWidget *parent) : QWidget(parent),set_value(18),value_max(50),value_min(0),value(0),step(1)
,changed(false)
{
    t=new QTimer(this);
    slip_value=set_value;
    save_value=slip_value;

    connect(t,SIGNAL(timeout()),this,SLOT(slipmove()));
    t->setInterval(10);

}
set_tem::~set_tem()
{

}
void set_tem::paintEvent(QPaintEvent *event){
    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing);
    painter.setRenderHint(QPainter::SmoothPixmapTransform);
    int diameter1;
    int diameter2;

    diameter1=qMin(width(),height())*2/5;
    center_x=width()/2;
    center_y=height()/2;
    diameter2=diameter1*0.94;
    diameter3=diameter1*0.4;
    QRectF rectf1(center_x-diameter1,center_y-diameter1,2*diameter1,2*diameter1);
    QRectF rectf2(center_x-diameter2,center_y-diameter2,2*diameter2,2*diameter2);
    float du_angle= set_value*180/(value_max-value_min);
    float angle=du_angle*3.141596/180;
    float r=diameter1/2+diameter2/2;
    x1=center_x-r*cos(angle);
    y1=center_y-r*sin(angle);
    QRectF rectf3(x1-diameter3/2,y1-diameter3/2,diameter3,diameter3);
    QRectF rectf4(x1-diameter3/2-3,y1-diameter3/2-3,diameter3+6,diameter3+6);

    QConicalGradient  qconicalgradient (center_x, center_y,360);  //背景颜色渐变
    qconicalgradient.setColorAt(0, QColor(255,14,143));
    qconicalgradient.setColorAt(0.3, QColor(254,62,43));
    qconicalgradient.setColorAt(0.3, QColor(205,46,210));
    qconicalgradient.setColorAt(0.5, QColor(61,160,254));
    qconicalgradient.setColorAt(0.7, QColor(205,46,210));
    qconicalgradient.setColorAt(0.8, QColor(254,62,43));
    qconicalgradient.setColorAt(1, QColor(255,14,143));

    QRadialGradient qradialgradient(x1,y1,diameter3,x1,y1);
    qradialgradient.setColorAt(0,QColor(0,0,0,255));
    qradialgradient.setColorAt(1,QColor(0,0,0,0));



    painter.setPen(Qt::NoPen);
    painter.setBrush(qconicalgradient);
    painter.drawEllipse(rectf1);

    painter.setBrush(QColor(45,42,60));
    painter.drawEllipse(rectf2);

    painter.setBrush(qradialgradient);
    painter.drawEllipse(rectf4);

    painter.setBrush(QColor(248,248,255));
    painter.drawEllipse(rectf3);

    QPen pen;
    pen.setColor(QColor(89,89,89));
    painter.setFont(QFont("Microsoft Yahei",diameter3*0.2, QFont::Bold));
    painter.setPen(pen);

    painter.drawText(rectf3,Qt::AlignCenter,QString("%1℃").arg(abs(set_value)));
    pen.setColor(QColor(248,248,255));
    value=QString::number(value, 'f', 1).toFloat();
    painter.setFont(QFont("Microsoft Yahei",diameter2*0.3, QFont::Bold));
    painter.setPen(pen);
    painter.drawText(rectf2,Qt::AlignCenter,QString("%1℃").arg(value));
}
void set_tem::mousePressEvent(QMouseEvent *e){

    if(isEnabled()){

        if(e->button()==Qt::LeftButton){
            e->accept();
            float d=sqrt(pow((e->x()-x1),2)+pow((e->y()-y1),2));
            if (d<diameter3/2){
                ispress=true;
             }

        }


    }
}

void set_tem::mouseMoveEvent(QMouseEvent *e){
    if(isEnabled()){
        if(ispress){
            e->accept();
            float angle;
            if (center_y==e->y()||center_x==e->x()){
                if(center_y==e->y()){
                    if(center_x<e->x()){
                        angle=180;

                    }
                    else{
                        angle=0;
                    }
                }
                if(center_x==e->x()){
                    if(center_y<e->y())
                        angle=-90;
                    else
                        angle=90;
                }
            }else{
                float y0=center_y-e->y();
                float x0=center_x-e->x();
                float k=y0/x0;
                angle=atan(k)*180.0/3.1415926;

                if(e->y()<center_y&&e->x()>center_x){
                     angle=angle+180;
                }
                if(e->y()>center_y&&e->x()>center_x){
                     angle=angle-180;
                }


           }
            slip_value=angle*(value_max-value_min)/180;
            t->start(1);

        }

    }

}
void set_tem::mouseReleaseEvent(QMouseEvent *e){
    if(isEnabled()){
        if((e->type() == QMouseEvent::MouseButtonRelease) && (e->button() == Qt::LeftButton)){
            ispress=false;
        }
    }
}
void set_tem::slipmove(){
    if(abs(slip_value-save_value)<0.0001){
        changed=true;
        emit toggled(changed);
        changed=false;
        t->stop();
    }else{
        step=(slip_value-save_value)/10;
        save_value=save_value+step;
        set_value=QString::number(save_value, 'f', 1).toFloat();

        update();
    }
}
float set_tem::get_temperature(){   //得到温度
    return abs(set_value);
}
void set_tem::set_temperature(float v){  //设置温度
    value=v;
    update();
}