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Qt+C++自定義控件儀表盤動畫仿真

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前言

這篇博客針對<<Qt+C++自定義控件儀表盤動畫仿真>>編寫代碼，代碼整潔，規則，易讀。學習與應用推薦首選。

文章目錄

一、所需工具軟件

二、使用步驟

????????1. 引入庫

????????2. 代碼實現

? ? ? ? 3. 運行結果

三、在線協助

一、所需工具軟件

1. VS, Qt

2. C++

二、使用步驟

1.引入庫

#include <QWidget>
#include <QPropertyAnimation>
#include <QtMath>
#include <QPainter>

2. 代碼實現

代碼如下:

#include "GaugePanel.h"
GaugePanel::~GaugePanel()
{hShearAnimation->stop();vShearAnimation->stop();delete hShearAnimation;delete vShearAnimation;
}void GaugePanel::paintEvent(QPaintEvent*)
{int width = this->width();int height = this->height();int side = qMin(width, height);//繪制準備工作,啟用反鋸齒,平移坐標軸中心,等比例縮放QPainter painter(this);painter.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing);painter.translate(width / 2, height / 2);painter.scale(side / 215.0, side / 215.0);painter.shear(double(hShearValue / 100.0f), double(vShearValue / 100.0f));//內層漸變drawInnerGradient(&painter);//外層漸變drawOuterGradient(&painter);//外層光暈drawOuterHalo(&painter);//刻度線drawScale(&painter);//刻度值drawScaleNum(&painter);//繪制指針drawPointer(&painter);//繪制指針扇形drawPointerSector(&painter);//繪制值drawValue(&painter);//繪制單位drawUnit(&painter);
}void GaugePanel::drawOuterGradient(QPainter* painter)
{if (radiusHalo <= radiusOuter)return;painter->save();QRectF rectangle(0 - radiusHalo, 0 - radiusHalo, radiusHalo * 2, radiusHalo * 2);QPen framePen(colorOuterFrame);framePen.setWidthF(1.5f);painter->setPen(framePen);painter->drawEllipse(rectangle);painter->setPen(Qt::NoPen);QPainterPath smallCircle;QPainterPath bigCircle;float radius = radiusOuter;smallCircle.addEllipse(-radius, -radius, radius * 2, radius * 2);radius += (radiusHalo - radiusOuter);bigCircle.addEllipse(-radius, -radius, radius * 2, radius * 2);//大圓拋去小圓部分QPainterPath gradientPath = bigCircle - smallCircle;QRadialGradient gradient(0, 0, radius, 0, 0);//gradient.setSpread(QGradient::ReflectSpread);gradient.setColorAt(0.85, colorOuterStart);gradient.setColorAt(0.98, colorOuterEnd);painter->setBrush(gradient);painter->drawPath(gradientPath);painter->restore();
}void GaugePanel::drawInnerGradient(QPainter* painter)
{if (radiusOuter <= radiusInner)return;painter->save();painter->setPen(Qt::NoPen);QPainterPath smallCircle;QPainterPath bigCircle;float radius = radiusInner;smallCircle.addEllipse(-radius, -radius, radius * 2, radius * 2);radius += (radiusOuter - radiusInner);bigCircle.addEllipse(-radius, -radius, radius * 2, radius * 2);//大圓拋去小圓部分QPainterPath gradientPath = bigCircle - smallCircle;QRadialGradient gradient(0, 0, radius, 0, 0);//gradient.setSpread(QGradient::ReflectSpread);gradient.setColorAt(0.7, colorInnerStart);gradient.setColorAt(1, colorInnerEnd);painter->setBrush(gradient);painter->drawPath(gradientPath);painter->restore();
}void GaugePanel::drawOuterHalo(QPainter* painter)
{painter->save();painter->setPen(Qt::NoPen);QPainterPath smallCircle;QPainterPath bigCircle;float radius = radiusHalo;smallCircle.addEllipse(-radius, -radius, radius * 2, radius * 2);radius += (110.0 - radiusHalo);bigCircle.addEllipse(-radius, -radius, radius * 2, radius * 2);//大圓拋去小圓部分QPainterPath gradientPath = bigCircle - smallCircle;QRadialGradient gradient(0, 0, 100, 0, 0);gradient.setSpread(QGradient::ReflectSpread);gradient.setColorAt(radiusHalo / 100, colorHaloStart);gradient.setColorAt(1, colorHaloEnd);painter->setBrush(gradient);painter->drawPath(gradientPath);painter->restore();
}void GaugePanel::drawScale(QPainter* painter)
{float radius = 85;painter->save();painter->setPen(QColor(255, 255, 255));painter->rotate(30);int steps = (30);double angleStep = (360.0 - 60) / steps;QPen pen = painter->pen();pen.setCapStyle(Qt::RoundCap);for (int i = 0; i <= steps; i++) {if (i % 3 == 0) {pen.setWidthF(1.5);painter->setPen(pen);QLineF line(0.0f, radius - 8.0f, 0.0f, radius);painter->drawLine(line);}else {pen.setWidthF(0.5);painter->setPen(pen);QLineF line(0.0f, radius - 3.0f, 0.0f, radius);painter->drawLine(line);}painter->rotate(angleStep);}painter->restore();
}void GaugePanel::drawScaleNum(QPainter* painter)
{float radius = 95.0f;painter->save();painter->setPen(QColor(255, 255, 255));double startRad = (330 - 90) * (M_PI / 180);double deltaRad = (300) * (M_PI / 180) / 10;for (int i = 0; i <= 10; i++) {double sina = sin(startRad - i * deltaRad);double cosa = cos(startRad - i * deltaRad);double value = 1.0 * i * ((30) / 10);//刻度值范圍QString strValue = QString("%1").arg((double)value, 0, 'f', 0);double textWidth = fontMetrics().width(strValue);double textHeight = fontMetrics().height();int x = radius * cosa - textWidth / 2;int y = -radius * sina + textHeight / 4;painter->drawText(x, y, strValue);}painter->restore();
}void GaugePanel::drawPointer(QPainter* painter)
{painter->save();float radius = 83.0;painter->rotate(30 + int(value * 10));QPen pen = painter->pen();pen.setWidthF(1.0);pen.setColor(QColor(50, 154, 255, 200));painter->setPen(pen);QLineF line(0.0f, 0.0f, 0.0f, radius);painter->drawLine(line);painter->restore();
}void GaugePanel::drawPointerSector(QPainter* painter)
{float radius = 87.5f;painter->save();painter->setPen(Qt::NoPen);QRectF rect(-radius, -radius, radius * 2, radius * 2);painter->setBrush(QColor(50, 154, 255, 50));painter->drawPie(rect, -120 * 16, -value * 16 * 10);painter->restore();
}void GaugePanel::drawValue(QPainter* painter)
{int radius = 100;painter->save();painter->setPen(QColor(255, 255, 255));painter->setFont(QFont("Arial", 22, 22, true));QRectF textRect(-radius, -radius, radius * 2, radius * 2);QString strValue = QString("%1").arg((double)value, 0, 'f', 0);painter->drawText(textRect, Qt::AlignCenter, strValue);painter->restore();
}void GaugePanel::drawUnit(QPainter* painter)
{int radius = 100;painter->save();painter->setPen(QColor(255, 255, 255));painter->setFont(QFont("Arial", 9, -1, true));QRectF textRect(-radius, -radius + 20, radius * 2, radius * 2);painter->drawText(textRect, Qt::AlignCenter, "km/h");painter->restore();
}double GaugePanel::getValue() const
{return this->value;
}int GaugePanel::getHShearValue() const
{return this->hShearValue;
}int GaugePanel::getVShearValue() const
{return this->vShearValue;
}double GaugePanel::getRadiusInner() const
{return radiusInner;
}double GaugePanel::getRadiusOuter() const
{return radiusOuter;
}double GaugePanel::getRadiusHalo() const
{return radiusHalo;
}QColor GaugePanel::getColorOuterFrame() const
{return colorOuterFrame;
}QColor GaugePanel::getColorInnerStart() const
{return colorInnerStart;
}QColor GaugePanel::getColorInnerEnd() const
{return colorInnerEnd;
}QColor GaugePanel::getColorOuterStart() const
{return colorOuterStart;
}QColor GaugePanel::getColorOuterEnd() const
{return colorOuterEnd;
}QColor GaugePanel::getColorHaloStart() const
{return colorHaloStart;
}QColor GaugePanel::getColorHaloEnd() const
{return colorHaloEnd;
}void GaugePanel::setValue(int value)
{setValue(double(value));
}void GaugePanel::setValue(double value) {updateValue(value);
}void GaugePanel::setHShearValue(int value)
{if (value > 100 || value < -100)return;this->hShearValue = value;update();
}void GaugePanel::setVShearValue(int value)
{if (value > 100 || value < -100)return;this->vShearValue = value;update();
}void GaugePanel::setColorOuterFrame(QColor color)
{colorOuterFrame = color;
}void GaugePanel::setRadiusInner(int radius)
{setRadiusInner(double(radius));
}void GaugePanel::setRadiusInner(double radius)
{if (radius >= 0.0f && radius < 100.0f) {radiusInner = radius;update();}
}void GaugePanel::setRadiusOuter(int radius)
{setRadiusOuter(double(radius));
}void GaugePanel::setRadiusOuter(double radius)
{if (radius > 0.0f && radius < 100.0f) {radiusOuter = radius;update();}
}void GaugePanel::setRadiusHalo(int radius)
{setRadiusHalo(double(radius));
}void GaugePanel::setRadiusHalo(double radius)
{if (radius > 0.0f && radius < 100.0f) {radiusHalo = radius;update();}
}void GaugePanel::setColorInnerStart(QColor color)
{colorInnerStart = color;
}void GaugePanel::setColorInnerEnd(QColor color)
{colorInnerEnd = color;
}void GaugePanel::setColorOuterStart(QColor color)
{colorOuterStart = color;
}void GaugePanel::setColorOuterEnd(QColor color)
{colorOuterEnd = color;
}void GaugePanel::setColorHaloStart(QColor color)
{colorHaloStart = color;
}void GaugePanel::setColorHaloEnd(QColor color)
{colorHaloEnd = color;
}void GaugePanel::startShearAnimal(int duration, int hShearValue, int vShearValue)
{if (hShearValue == this->hShearValue && vShearValue == this->vShearValue) {return;}if (hShearAnimation->state() != QPropertyAnimation::Stopped) {hShearAnimation->stop();}if (vShearAnimation->state() != QPropertyAnimation::Stopped) {vShearAnimation->stop();}hShearAnimation->setDuration(duration);hShearAnimation->setStartValue(this->hShearValue);hShearAnimation->setEndValue(hShearValue);hShearAnimation->start();vShearAnimation->setDuration(duration);vShearAnimation->setStartValue(this->vShearValue);vShearAnimation->setEndValue(vShearValue);vShearAnimation->start();
}void GaugePanel::updateValue(double value)
{if (value > 30.0 || value < 0.0) {return;}this->value = value;//update();this->update();// emit valueChanged(value);
}