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Qt 实现炫酷仪表盘源码分享

Qt 实现炫酷仪表盘源码分享

Qt 实现炫酷仪表盘源码分享

  • 一、效果展示
  • 二、源码分享
    • 1、工程结构
    • 2、speedmeterwidget.h
    • 3、speedmeterwidget.cpp
    • 4、mainWindow.cpp
    • 5、完整工程下载
  • 三、实现原理
    • 1、 QPainter 的基本概念
    • 2、绘图设备与坐标系
    • 3、 基本绘图操作
      • 3.1、 绘制几何图形
      • 3.2 、绘制文本
      • 3.3 、绘制图像
    • 4、 画笔(QPen)与画刷(QBrush)
      • 4.1、 QPen - 控制轮廓绘制
      • 4.2 、QBrush - 控制填充
    • 5、 高级绘图特性
      • 5.1、 抗锯齿(Antialiasing)
      • 5.2 、合成模式(Composition Mode)
      • 5.3 、裁剪区域(Clipping)
    • 6、 在速度表项目中的应用
      • 6.1、 坐标系变换
      • 6.2 、渐变效果
      • 6.3 、文本绘制与对齐
    • 7、性能优化建议
    • 8、Qt6 中的新特性
    • 9、常见问题与调试技巧
      • 9.1、 绘图不显示
      • 9.2、 性能问题
      • 9.3、 坐标计算错误
    • 总结

一、效果展示

二、源码分享

1、工程结构

2、speedmeterwidget.h

#ifndef SPEEDMETERWIDGET_H#define SPEEDMETERWIDGET_H#include<QWidget>#include<QPainter>#include<QRadialGradient>#include<QFont>#include<QFontDatabase>#include<QPointF>#include<QRectF>class SpeedMeterWidget : public QWidget{    Q_OBJECTpublic:    explicitSpeedMeterWidget(QWidget *parent = nullptr);    voidsetCurrentValue(int val);protected:    voidpaintEvent(QPaintEvent *event)override;private:    int m_maxValue = 260;    int m_minValue = 0;    int m_currentValue = 130;    int m_redValue = 200;    QColor m_bgColor;    QFont m_digitFont;};#endif// SPEEDMETERWIDGET_H

3、speedmeterwidget.cpp

#include "SpeedMeterWidget.h"#include <cmath>#include <QFontMetricsF>SpeedMeterWidget::SpeedMeterWidget(QWidget *parent)    : QWidget(parent),    m_bgColor(QColor("#00020414")){    // 加载外部数字字体 Digitall.ttf,资源文件里注册    int fontId = QFontDatabase::addApplicationFont(":/font/image/Digitall.ttf");    if(fontId != -1)    {        QString family = QFontDatabase::applicationFontFamilies(fontId).first();        m_digitFont = QFont(family);    }    else    {        // 兜底字体        m_digitFont = QFont("Arial"40);    }}void SpeedMeterWidget::setCurrentValue(int val){    m_currentValue = val;    update(); // 触发重绘}void SpeedMeterWidget::paintEvent(QPaintEvent *event){    QWidget::paintEvent(event);    QPainter painter(this);    painter.setRenderHint(QPainter::Antialiasing);    int w = width();    int h = height();    qreal centerX = w / 2.0;    qreal centerY = h / 2.0;    qreal radius = qMin(w, h) / 2.0 * 0.9;    // 1. 背景填充    painter.fillRect(00, w, h, m_bgColor);    // 2. 内层红色径向渐变圆环    QRadialGradient radialGrad(centerX, centerY, radius * 0.6);    QColor colCenter("#E43223");    QColor colEdge("#00E43223");    radialGrad.setColorAt(0, colCenter);    radialGrad.setColorAt(1, colEdge);    painter.setBrush(radialGrad);    painter.setPen(Qt::NoPen);    painter.drawEllipse(QPointF(centerX, centerY), radius * 0.6, radius * 0.6);    // 3. 中间黑色内圆    painter.setBrush(Qt::black);    painter.drawEllipse(QPointF(centerX, centerY), radius * 0.5, radius * 0.5);    // ====================== 绘制刻度线 ======================    painter.save();    const int startAngle 45;    qreal r = radius;    const int totalSteps 130;    qreal rotateStep = (360.0 - startAngle * 2) / totalSteps;    painter.translate(centerX, centerY);    painter.rotate(startAngle);    for(int i = 0; i <= totalSteps; ++i)    {        int val = i * 2;        QColor bigColor, smallColor;        if(val >= m_redValue)        {            bigColor = Qt::red;            smallColor = Qt::red;        }        else        {            bigColor = QColor("#B6C6D6");            smallColor = QColor("#525B62");        }        QPen pen;        pen.setCapStyle(Qt::RoundCap);        if(i % 10 == 0)        {            pen.setColor(bigColor);            pen.setWidth(9);            painter.setPen(pen);            painter.drawLine(QPointF(0, r), QPointF(0, r / 1.1));        }        else if (i % 5 == 0)        {            pen.setColor(smallColor);            pen.setWidth(8);            painter.setPen(pen);            painter.drawLine(QPointF(0, r), QPointF(0, r / 1.08));        }        else        {            pen.setColor(smallColor);            pen.setWidth(6);            painter.setPen(pen);            painter.drawLine(QPointF(0, r), QPointF(0, r / 1.05));        }        painter.rotate(rotateStep);    }    painter.restore();    // ====================== 外圈刻度数字 ======================    painter.save();    qreal numR = radius * 0.75;    qreal numGapAngle = (360.0 - startAngle * 2) / 13.0;    qreal valStep = (m_maxValue - m_minValue) / 13.0;    qreal currentDrawVal = m_minValue;    int startDeg = startAngle;    QFont numFont = m_digitFont;    numFont.setPointSizeF(w * 0.04);    painter.setFont(numFont);    QFontMetricsF fm(numFont);    for(int i = 0; i < 14; ++i)    {        if(currentDrawVal >= m_redValue)            painter.setPen(Qt::red);        else            painter.setPen(Qt::white);        qreal angleDeg = -90.0 + startDeg + numGapAngle * i;        qreal rad = qDegreesToRadians(angleDeg);        qreal x = -numR * cos(rad);        qreal y = -numR * sin(rad);        painter.save();        painter.translate(centerX + x, centerY + y);        QString text = QString::number(qRound(currentDrawVal));        qreal textW = fm.horizontalAdvance(text);        qreal textH = w * 0.06;        qreal offsetY = textH / 4.0;        painter.drawText(QPointF(-textW / 2.0, offsetY), text);        painter.restore();        currentDrawVal += valStep;    }    painter.restore();    // ====================== 指针绘制 ======================    painter.save();    qreal degRotate = (270.0 / (m_maxValue - m_minValue)) * (m_currentValue - m_minValue) + 135.0;    painter.translate(centerX, centerY);    painter.rotate(degRotate);    QPen pen;    pen.setColor(Qt::white);    pen.setWidth(8);    pen.setCapStyle(Qt::RoundCap);    painter.setPen(pen);    painter.drawLine(QPointF(radius * 0.50), QPointF(radius * 0.90));    painter.restore();    // ====================== 中心三位数字 + KM/h ======================    painter.save();    painter.setPen(Qt::white);    // 大数字字体    qreal numFontSize = w * 0.12;    QFont bigFont = m_digitFont;    bigFont.setPointSizeF(numFontSize);    painter.setFont(bigFont);    QFontMetricsF fmBig(bigFont);    int val = m_currentValue;    int hundred = val / 100;    int ten = (val / 10) % 10;    int unit = val % 10;    qreal singleW = fmBig.horizontalAdvance("0");    qreal gap = singleW * 0.001;    qreal totalWidth = singleW * 3 + gap * 2;    qreal startX = centerX - totalWidth / 2.0;    // 百位    if(hundred == 0)        painter.setPen(QColor("#666666"));    else        painter.setPen(Qt::white);    painter.drawText(QPointF(startX, centerY), QString::number(hundred));    // 十位    qreal tenX = startX + singleW + gap;    if(ten == 0 && hundred == 0)        painter.setPen(QColor("#666666"));    else        painter.setPen(Qt::white);    painter.drawText(QPointF(tenX, centerY), QString::number(ten));    // 个位    qreal unitX = tenX + singleW + gap;    if(unit == 0 && hundred == 0 && ten == 0)        painter.setPen(QColor("#666666"));    else        painter.setPen(Qt::white);    painter.drawText(QPointF(unitX, centerY), QString::number(unit));    // KM/h 下方文字    QFont unitFont = m_digitFont;    unitFont.setPointSizeF(w * 0.05);    painter.setFont(unitFont);    QRectF rectUnit(0, centerY + 50, w, h);    painter.drawText(rectUnit, Qt::AlignHCenter"KM/h");    painter.restore();}

4、mainWindow.cpp

#include"mainwindow.h"#include<QDebug>#include<QWidget>#include<QVBoxLayout>#include<QSlider>#include"speedmeterwidget.h"MainWindow::MainWindow(QWidget *parent)    : QMainWindow(parent){    this->resize(800800);    QWidget *central = new QWidget(this);    central->setStyleSheet("background-color: #020414;");    this->setCentralWidget(central);    QVBoxLayout *lay = new QVBoxLayout(central);    lay->setContentsMargins(00020);    SpeedMeterWidget *meter = new SpeedMeterWidget();    lay->addWidget(meter);    QSlider *slider = new QSlider(Qt::Horizontal);    slider->setRange(0260);    slider->setValue(130);    lay->addWidget(slider);    // 滑块联动更新数值    QObject::connect(slider, &QSlider::valueChanged, meter, &SpeedMeterWidget::setCurrentValue);}MainWindow::~MainWindow(){}

5、完整工程下载

https://download.csdn.net/download/qq_15181569/93203495

三、实现原理

QPainter 是 Qt 框架中用于执行绘图操作的核心类,它提供了丰富的 API 来绘制各种图形、文本和图像。在 Qt6 中,QPainter 的功能得到了进一步增强和优化。

1、 QPainter 的基本概念

QPainter 采用画家算法(Painter’s Algorithm)进行绘图,即后绘制的图形会覆盖先绘制的图形。它支持在多种绘图设备上工作:

  • QWidget
    :在窗口部件上绘图
  • QPixmap
    :在位图上绘图
  • QImage
    :在图像上绘图
  • QPrinter
    :在打印机上绘图

2、绘图设备与坐标系

// 创建 QPainter 对象QPainter painter(this);  // 在 QWidget 上绘图painter.setRenderHint(QPainter::Antialiasing);  // 开启抗锯齿

QPainter 使用逻辑坐标系,默认原点在左上角,X轴向右,Y轴向下。可以通过以下方法变换坐标系:

// 坐标变换painter.translate(100100);    // 平移坐标系painter.rotate(45);             // 旋转坐标系painter.scale(2.02.0);        // 缩放坐标系painter.shear(0.50);          // 错切变换

3、 基本绘图操作

3.1、 绘制几何图形

// 绘制线条painter.drawLine(QPointF(00), QPointF(100100));// 绘制矩形painter.drawRect(QRectF(101010050));// 绘制椭圆/圆形painter.drawEllipse(QPointF(5050), 3030);// 绘制多边形QPolygonF polygon;polygon << QPointF(00) << QPointF(500) << QPointF(2550);painter.drawPolygon(polygon);

3.2 、绘制文本

// 设置字体QFont font("Arial"12QFont::Bold);painter.setFont(font);// 绘制文本painter.drawText(QPointF(1030), "Hello Qt6!");painter.drawText(QRectF(105020050), Qt::AlignCenter"居中文本");

3.3 、绘制图像

QPixmap pixmap(":/images/logo.png");painter.drawPixmap(1010, pixmap);

4、 画笔(QPen)与画刷(QBrush)

4.1、 QPen - 控制轮廓绘制

QPen pen;pen.setColor(Qt::red);           // 设置颜色pen.setWidth(3);                 // 设置线宽pen.setStyle(Qt::DashLine);      // 设置线型pen.setCapStyle(Qt::RoundCap);   // 设置端点样式pen.setJoinStyle(Qt::RoundJoin); // 设置连接样式painter.setPen(pen);

4.2 、QBrush - 控制填充

QBrush brush;brush.setColor(Qt::blue);                // 纯色填充brush.setStyle(Qt::SolidPattern);        // 填充样式// 渐变填充QLinearGradient gradient(00100100);gradient.setColorAt(0Qt::white);gradient.setColorAt(1Qt::black);brush = QBrush(gradient);painter.setBrush(brush);

5、 高级绘图特性

5.1、 抗锯齿(Antialiasing)

painter.setRenderHint(QPainter::Antialiasing);        // 开启抗锯齿painter.setRenderHint(QPainter::TextAntialiasing);    // 文本抗锯齿painter.setRenderHint(QPainter::SmoothPixmapTransform); // 平滑图像变换

5.2 、合成模式(Composition Mode)

// 设置合成模式painter.setCompositionMode(QPainter::CompositionMode_SourceOver);  // 默认:源覆盖目标painter.setCompositionMode(QPainter::CompositionMode_SourceIn);    // 源在目标内部painter.setCompositionMode(QPainter::CompositionMode_Xor);         // 异或模式

5.3 、裁剪区域(Clipping)

// 设置裁剪区域QPainterPath clipPath;clipPath.addEllipse(5050100100);painter.setClipPath(clipPath);// 恢复裁剪painter.setClipping(false);

6、 在速度表项目中的应用

在本项目的 SpeedMeterWidget::paintEvent() 中,我们充分利用了 QPainter 的各种功能:

6.1、 坐标系变换

// 保存当前绘图状态painter.save();// 平移坐标系到圆心painter.translate(centerX, centerY);// 旋转坐标系绘制刻度线painter.rotate(startAngle);for (int i = 0; i <= totalSteps; ++i) {    painter.drawLine(...);    painter.rotate(rotateStep);}// 恢复绘图状态painter.restore();

6.2 、渐变效果

// 创建径向渐变QRadialGradient radialGrad(centerX, centerY, radius * 0.6);radialGrad.setColorAt(0, QColor("#E43223"));  // 中心颜色radialGrad.setColorAt(1, QColor("#00E43223")); // 边缘颜色(透明)painter.setBrush(radialGrad);painter.drawEllipse(QPointF(centerX, centerY), radius * 0.6, radius * 0.6);

6.3 、文本绘制与对齐

// 计算文本宽度进行居中QFontMetricsF fm(numFont);QString text = QString::number(qRound(currentDrawVal));qreal textW = fm.horizontalAdvance(text);painter.drawText(QPointF(-textW / 2.0, offsetY), text);

7、性能优化建议

  1. 避免频繁创建 QPainter 对象
    :在 paintEvent 中创建一次即可
  2. 合理使用 save()/restore()
    :及时恢复绘图状态
  3. 预计算不变的值
    :如字体度量、几何计算等
  4. 使用 QPainterPath
    :复杂图形使用路径绘制
  5. 开启硬件加速
    :在支持 OpenGL 的设备上使用 QOpenGLWidget

8、Qt6 中的新特性

Qt6 对 QPainter 进行了以下改进:

  • 更好的 HiDPI 支持
    :自动处理高分辨率显示
  • 改进的文本渲染
    :支持更多字体特性
  • 增强的渐变效果
    :支持更多渐变类型
  • 性能优化
    :绘图操作更加高效

9、常见问题与调试技巧

9.1、 绘图不显示

  • 检查是否在 paintEvent 中绘图
  • 确认调用了 update() 触发重绘
  • 验证绘图区域是否在可见范围内

9.2、 性能问题

  • 使用 QElapsedTimer 测量绘图时间
  • 减少不必要的绘图操作
  • 考虑使用缓存(QPixmapCache)

9.3、 坐标计算错误

  • 使用 qDebug() 输出坐标值
  • 绘制参考线辅助调试
  • 注意坐标系变换的顺序

总结

QPainter 是 Qt 图形系统的核心,掌握它的使用对于开发高质量的 GUI 应用至关重要。通过本项目的实践,您应该能够理解如何:

  1. 使用坐标系变换简化复杂绘图
  2. 应用渐变和抗锯齿提升视觉效果
  3. 优化绘图性能
  4. 处理文本和图形的精确对齐
基本 文件 流程 错误 SQL 调试
  1. 请求信息 : 2026-08-09 00:03:39 HTTP/1.1 GET : https://www.yeyulingfeng.com/a/889913.html
  2. 运行时间 : 0.081546s [ 吞吐率:12.26req/s ] 内存消耗:4,774.52kb 文件加载:145
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=954c2b24d86126a966cc3acf1fdf3380
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  1. CONNECT:[ UseTime:0.000642s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001042s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000376s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000279s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000683s ]
  6. SELECT * FROM `set` [ RunTime:0.000248s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000816s ]
  8. SELECT * FROM `article` WHERE `id` = 889913 LIMIT 1 [ RunTime:0.000718s ]
  9. UPDATE `article` SET `lasttime` = 1786205019 WHERE `id` = 889913 [ RunTime:0.000965s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000285s ]
  11. SELECT * FROM `article` WHERE `id` < 889913 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000543s ]
  12. SELECT * FROM `article` WHERE `id` > 889913 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000443s ]
  13. SELECT * FROM `article` WHERE `id` < 889913 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000942s ]
  14. SELECT * FROM `article` WHERE `id` < 889913 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000981s ]
  15. SELECT * FROM `article` WHERE `id` < 889913 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001389s ]
0.083245s