网站建设运营策划方案,建站行业乱象完整版,网站模版html,小型企业网站模板文章目录 0 引入1、带有标尺的温度/湿度计控件1.头文件2.核心代码 2、竖起来的温度/湿度计控件1.头文件2.实现 3、引用 0 引入 QT原生控件没有实现如仪表盘或者温度计的控件#xff0c;只好自己实现#xff0c;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… 文章目录 0 引入1、带有标尺的温度/湿度计控件1.头文件2.核心代码 2、竖起来的温度/湿度计控件1.头文件2.实现 3、引用 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。 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, value0.5);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(startValue0.5);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。 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 QTimerclass 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 QDebugthermometreDlg::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)/101;qreal perHeight (m_rect.height())/nYCount;for (int i0; inYCount; i) {QPointF basePoint m_rect.bottomLeft() - QPointF(0, perHeight/2) - QPointF(0, perHeight*i);//左侧大刻度painter.drawLine(basePoint, basePointQPointF(-10, 0));for (int j1; j10; j) {if(i nYCount -1)continue;painter.drawLine(basePoint-QPointF(0, perHeight/10*j),basePoint-QPointF(5, perHeight/10*j));}painter.drawText(basePointQPointF(-28, 4), QString(%1).arg(minValuei*10));//右侧大刻度basePoint m_rect.bottomRight() - QPointF(0, perHeight/2) - QPointF(0, perHeight*i);painter.drawLine(basePoint, basePointQPointF(10, 0));for (int j1; j10; 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(h0)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, curValue1);m_valueAnimation-setKeyValueAt(1, curValue);m_valueAnimation-setStartValue(startValue-2);m_valueAnimation-start(); } 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