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0 引入

QT原生控件没有实现如仪表盘或者温度计的控件，只好自己实现，文章代码部分参考引用的文章。直接上图

图一 带有标尺的温度计、湿度
图二 温度计、湿度

控件最核心的部分：在函数paintEvent绘制部分，如果需要动画效果还需要加一个QPropertyAnimation ，这是最主要的，剩下的细节根据需求增加减少即可。

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1、带有标尺的温度/湿度计控件

因为只做数据显示用，所以只需要向控件传数据即可。
主要功能：1、可设置显示范围；
2、显示过程中加了动画效果；
3、背景色和前景色以及刻度尺颜色可变；
4、刻度尺间距可变，控件大小随着QWidget适应；

1.头文件

代码如下（示例）：

protected:void paintEvent(QPaintEvent *);void drawBg(QPainter *painter);void drawProgress(QPainter *painter);void drawRulerTop(QPainter *painter);void drawRulerBottom(QPainter *painter);private:QPropertyAnimation *m_valueAnimation;double minValue;                //最小值double maxValue;                //最大值qreal value;                    //当前值int longStep;                   //长线条等分步长int shortStep;                  //短线条等分步长bool rulerTop;                  //刻度线在上面bool isAdd;                     //是否为增加，默认为的增加QColor bgColor;                 //背景颜色QColor lineColor;               //线条颜色QColor progressColor;           //进度颜色public:qreal getValue()               const;void setrulerTop(bool istop);   //设定刻度线再上还是在下，默认是在上void setValue(qreal v);void setRange(int minValue, int maxValue);void startAnimation();void updateValue(double value);void setBgColor(const QColor &bgColor);               //设置背景颜色void setLineColor(const QColor &lineColor);           //设置线条颜色void setProgressColor(const QColor &progressColor);   //设置进度颜色

2.核心代码

绘制部分参考引用2代码，感谢刘典武老师的无私开源，有需要的可去做定制。
代码如下：

void HumidityProgress::startAnimation()
{qreal startValue =  value;if(isAdd){m_valueAnimation->setKeyValueAt(0.5, value+0.5);m_valueAnimation->setKeyValueAt(1, value);m_valueAnimation->setStartValue(startValue-0.5);m_valueAnimation->start();}else{m_valueAnimation->setKeyValueAt(0.5, value-0.5);m_valueAnimation->setKeyValueAt(1, value);m_valueAnimation->setStartValue(startValue+0.5);m_valueAnimation->start();}}void HumidityProgress::paintEvent(QPaintEvent *)
{//绘制准备工作,启用反锯齿QPainter painter(this);painter.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing);//按照绘制顺序drawBg(&painter);drawProgress(&painter);if (rulerTop) {drawRulerTop(&painter);} else {drawRulerBottom(&painter);}
}void HumidityProgress::drawBg(QPainter *painter)
{painter->save();painter->setPen(lineColor);painter->setBrush(bgColor);painter->drawRect(rect());painter->restore();
}void HumidityProgress::drawProgress(QPainter *painter)
{painter->save();painter->setPen(Qt::NoPen);painter->setBrush(progressColor);double length = width();double increment = length / (maxValue - minValue);double initX = (value - minValue) * increment;QRect rect(0, 0, initX, height());painter->drawRect(rect);painter->restore();
}void HumidityProgress::drawRulerTop(QPainter *painter)
{painter->save();painter->setPen(lineColor);double initX = 0;//绘制横向标尺上部分底部线double initTopY = 0;QPointF lineTopLeftPot = QPointF(initX, initTopY);QPointF lineTopRightPot = QPointF(width() - initX, initTopY);painter->drawLine(lineTopLeftPot, lineTopRightPot);//绘制上部分及下部分横向标尺刻度double length = width();//计算每一格移动多少double increment = length / (maxValue - minValue);//长线条短线条长度int longLineLen = 15;int shortLineLen = 10;//根据范围值绘制刻度值及刻度值 长线条需要移动10像素 短线条需要移动5像素for (int i = minValue; i <= maxValue; i = i + shortStep) {if (i % longStep == 0) {QPointF topPot = QPointF(initX, initTopY);QPointF bottomPot = QPointF(initX, initTopY + longLineLen);painter->drawLine(topPot, bottomPot);//第一个值和最后一个值不要绘制if (i == minValue || i == maxValue) {initX += increment * shortStep;continue;}QString strValue = QString("%1").arg((double)i, 0, 'f', 0);double textWidth = fontMetrics().width(strValue);double textHeight = fontMetrics().height();QPointF textPot = QPointF(initX - textWidth / 2, initTopY + textHeight + longLineLen);painter->drawText(textPot, strValue);} else {if (i % (longStep / 2) == 0) {shortLineLen = 10;} else {shortLineLen = 6;}QPointF topPot = QPointF(initX, initTopY);QPointF bottomPot = QPointF(initX, initTopY + shortLineLen);painter->drawLine(topPot, bottomPot);}initX += increment * shortStep;}painter->restore();
}

该处使用的url网络请求的数据。

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2、竖起来的温度/湿度计控件

因为只做数据显示用，所以只需要向控件传数据即可。
控件是好看，但是大小不能改变，所以这里需要自己实现了，源码作者已经放上。

1.头文件

代码如下（示例）：

#ifndef THERMOMETREDLG_H
#define THERMOMETREDLG_H#include <QWidget>
#include <QPropertyAnimation>
#include <QPainter>
#include <QTimer>class thermometreDlg : public QWidget
{Q_OBJECTQ_PROPERTY(qreal value READ getValue WRITE setValue)  //声明属性public:explicit thermometreDlg(QWidget *parent = nullptr);qreal getValue();void setValue(qreal value);void changeValue(qreal value);protected:void paintEvent(QPaintEvent *e);public slots:void startAnimation();signals:private:qreal m_value;qreal curValue;int m_width;QRectF m_rect;int maxValue, minValue;qreal m_radius;QPropertyAnimation *m_valueAnimation;void updateRect();};#endif // THERMOMETREDLG_H

2.实现

代码如下（示例）：

#include "thermometredlg.h"
#include <QDebug>thermometreDlg::thermometreDlg(QWidget *parent) : QWidget(parent)
{m_width = 20;maxValue = 100;minValue = 0;m_radius = 1.05;m_value = 0;curValue = m_value;QTimer *at = new QTimer(this);at->start(1000);m_valueAnimation = new QPropertyAnimation(this, "value");m_valueAnimation->setDuration(1000);m_valueAnimation->setEasingCurve(QEasingCurve::OutCubic);m_valueAnimation->setLoopCount(1);connect(at, SIGNAL(timeout()), this, SLOT(startAnimation()));}void thermometreDlg::updateRect()
{m_rect.setX(0);m_rect.setY(20 - height()/2);m_rect.setWidth(m_width);m_rect.setHeight(height() - 40 - m_width* m_radius);
}void thermometreDlg::setValue(qreal value)
{m_value = value;update();
}void thermometreDlg::changeValue(qreal value)
{if(value > maxValue)value = maxValue;if(value < minValue)value = minValue;curValue = value;
}qreal thermometreDlg::getValue()
{return m_value;
}void thermometreDlg::paintEvent(QPaintEvent *e)
{updateRect();QPainter painter(this);QPen pen(Qt::black);painter.translate(this->width()/2, this->height()/2);  //坐标轴移动到中心点painter.setRenderHints(QPainter::TextAntialiasing | QPainter::Antialiasing);  // 启用反锯齿painter.save();//绘制上方的柱状painter.fillRect(m_rect, QColor(168,200, 225));//绘制底部的圆QRectF tmpRect = QRectF(m_rect.bottomLeft(), QPointF(m_width, height()/2- m_width*m_radius));painter.fillRect(tmpRect, QColor(255, 0, 0));painter.setPen(Qt::NoPen);painter.setBrush(QColor(255, 0, 0));painter.drawEllipse(tmpRect.bottomLeft()+QPointF(tmpRect.width()/2, 0),m_width*m_radius, m_width*m_radius);painter.restore();//绘制刻度以及刻度值painter.save();painter.setPen(QColor(Qt::black));int nYCount = (maxValue - minValue)/10+1;qreal perHeight = (m_rect.height())/nYCount;for (int i=0; i<nYCount; ++i) {QPointF basePoint = m_rect.bottomLeft() - QPointF(0, perHeight/2) - QPointF(0, perHeight*i);//左侧大刻度painter.drawLine(basePoint, basePoint+QPointF(-10, 0));for (int j=1; j<10; ++j) {if(i == nYCount -1)continue;painter.drawLine(basePoint-QPointF(0, perHeight/10*j),basePoint-QPointF(5, perHeight/10*j));}painter.drawText(basePoint+QPointF(-28, 4), QString("%1").arg(minValue+i*10));//右侧大刻度basePoint = m_rect.bottomRight() - QPointF(0, perHeight/2) - QPointF(0, perHeight*i);painter.drawLine(basePoint, basePoint+QPointF(10, 0));for (int j=1; j<10; ++j) {if(i == nYCount -1)continue;painter.drawLine(basePoint-QPointF(0, perHeight/10*j),basePoint-QPointF(-5, perHeight/10*j));}}painter.restore();//根据值填充m_rectqreal h = (m_value-minValue)/(maxValue-minValue)*(m_rect.height()-perHeight);if(h<0)h = 0;if(h > m_rect.height())h = m_rect.height();painter.fillRect(m_rect.adjusted(0, m_rect.height()-h-perHeight/2-1 , 0, 0), QColor(255, 0, 0));QWidget::paintEvent(e);
}void thermometreDlg::startAnimation()
{qreal startValue = getValue();m_valueAnimation->setKeyValueAt(0, startValue-1);m_valueAnimation->setKeyValueAt(0.5, curValue+1);m_valueAnimation->setKeyValueAt(1, curValue);m_valueAnimation->setStartValue(startValue-2);m_valueAnimation->start();
}

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3、引用

1、用qt实现一个温度计控件
2、Qt编写自定义控件2-进度条标尺
3、Qt动画框架：QPropertyAnimation（属性动画）

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