Qt编写自定义控件18-魔法小鱼

前言

上次发了个纯painter绘制的老鼠，那个就是qt目录下的demo，改的，只是比demo中的老鼠稍微胖一点，估计人到中年都发福吧。这次来一个魔法小鱼，这条鱼可以变换颜色，尾巴还会摇动，可以设定旋转的角度以及尾巴摆动的幅度等，原理是参考网上一个安卓大神写的（绘制原理 https://www.jianshu.com/p/3dd3d1524851）。

其实在Qt学习过程中，如果越到问题找不到相关文章和答案，可以试着将关键字改成安卓试试，你会发现另外一篇天地，大量的资源和文章介绍等，就比如安卓中用的java的painter，就几乎和Qt中的一样，估计填写编程语言都很类似，连方法名字几乎都是一样，设置参数，具有很多通用性，作为一名程序员，最重要的是理解思路和原理，甚至学习的方法，这些掌握了，任何语言都不是问题。

实现的功能

魔幻鱼控件作者:feiyangqingyun(QQ:517216493) 2018-7-15
本控件来源于网络(原作者:tyroneli(http://www.qtcn.org/bbs/read-htm-tid-65412.html))
绘制原理 https://www.jianshu.com/p/3dd3d1524851
1:可设置鱼头+鱼身+鱼鳍+鱼尾的颜色
2:可设置鱼头+鱼身+鱼鳍+鱼尾的比例
3:可设置基准颜色,作为所有统一颜色
4:可设置鱼鳍是否摆动
5:可设置鱼的停留位置旋转角度

效果图

头文件代码

#ifndef MAGICFISH_H

#define MAGICFISH_H

/**

 * 魔幻鱼控件 作者:feiyangqingyun(QQ:517216493) 2018-7-15

 * 本控件来源于网络(原作者:tyroneli(http://www.qtcn.org/bbs/read-htm-tid-65412.html))

 * 绘制原理 https://www.jianshu.com/p/3dd3d1524851

 * 1:可设置鱼头+鱼身+鱼鳍+鱼尾的颜色

 * 2:可设置鱼头+鱼身+鱼鳍+鱼尾的比例

 * 3:可设置基准颜色,作为所有统一颜色

 * 4:可设置鱼鳍是否摆动

 * 5:可设置鱼的停留位置旋转角度

 */

#include <QWidget>

#ifdef quc

#if (QT_VERSION < QT_VERSION_CHECK(5,7,0))

#include <QtDesigner/QDesignerExportWidget>

#else

#include <QtUiPlugin/QDesignerExportWidget>

#endif

class QDESIGNER_WIDGET_EXPORT MagicFish : public QWidget

#else

class MagicFish : public QWidget

#endif

{

    Q_OBJECT

    Q_PROPERTY(QColor headColor READ getHeadColor WRITE setHeadColor)

    Q_PROPERTY(QColor bodyColor READ getBodyColor WRITE setBodyColor)

    Q_PROPERTY(QColor finColor READ getFinColor WRITE setFinColor)

    Q_PROPERTY(QColor tailColor READ getTailColor WRITE setTailColor)

    Q_PROPERTY(QColor baseColor READ getBaseColor WRITE setBaseColor)

    Q_PROPERTY(bool finMove READ getFinMove WRITE setFinMove)

    Q_PROPERTY(int speed READ getSpeed WRITE setSpeed)

    Q_PROPERTY(double wave READ getWave WRITE setWave)

    Q_PROPERTY(double currentAngle READ getCurrentAngle WRITE setCurrentAngle)

public:

    explicit MagicFish(QWidget *parent = 0);

    ~MagicFish();

protected:

    void resizeEvent(QResizeEvent *);

    void paintEvent(QPaintEvent *);

    void drawHead(QPainter *painter);

    void drawBody(QPainter *painter, const QPointF &pos, double angle);

    void drawFin(QPainter *painter, const QPointF &pos, bool left, double angle);

    void drawTail(QPainter *painter, const QPointF &pos, double angle);

    void drawTail1(QPainter *painter, const QPointF &pos, double angle);

    void drawTail2(QPainter *painter, const QPointF &pos, double angle);

private:

    //计算坐标点

    QPointF calcPoint(const QPointF &pos, double len, double angle);

    double qDegreesToRadians(double degrees);

    double qRadiansToDegrees(double radians);

private:

    QColor headColor;           //鱼头颜色

    QColor bodyColor;           //鱼身颜色

    QColor finColor;            //鱼鳍颜色

    QColor tailColor;           //鱼尾颜色

    QColor baseColor;           //基准颜色

    bool finMove;               //鱼鳍是否摆动

    int speed;                  //游动的速度即尾巴摆动的频率

    double wave;                //晃动的幅度

    double currentAngle;        //旋转的角度

    int currentValue;           //游动的位置

    double headLen;             //鱼头尺寸

    double bodyLen;             //鱼身尺寸

    double finLen;              //鱼鳍尺寸

    double tailLen;             //鱼尾尺寸

    QPointF headPos;            //鱼头坐标

    QTimer *timer;              //定时器处理游动

public:

    QColor getHeadColor()       const;

    QColor getBodyColor()       const;

    QColor getFinColor()        const;

    QColor getTailColor()       const;

    QColor getBaseColor()       const;

    bool getFinMove()           const;

    int getSpeed()              const;

    double getWave()            const;

    double getCurrentAngle()    const;

    double getHeadLen()         const;

    QPointF getHeadPos()        const;

    QSize sizeHint()            const;

    QSize minimumSizeHint()     const;

private slots:

    void updateValue();

public slots:

    //设置鱼头颜色

    void setHeadColor(const QColor &headColor);

    //设置鱼身颜色

    void setBodyColor(const QColor &bodyColor);

    //设置鱼鳍颜色

    void setFinColor(const QColor &finColor);

    //设置鱼尾颜色

    void setTailColor(const QColor &tailColor);

    //设置基准颜色

    void setBaseColor(const QColor &baseColor);

    //设置鱼鳍是否摆动

    void setFinMove(bool finMove);

    //设置游动的速度

    void setSpeed(int speed);

    //设置滑动的幅度

    void setWave(double wave);

    //设置当前旋转的角度

    void setCurrentAngle(double currentAngle);

    void setCurrentAngle(int currentAngle);

    //设置头部的长度

    void setHeadLen(int headLen);

};

#endif // MAGICFISH_H

完整代码

#pragma execution_character_set("utf-8")

#include "magicfish.h"

#include "qpainter.h"

#include "qmath.h"

#include "qtimer.h"

#include "qdebug.h"

MagicFish::MagicFish(QWidget *parent) : QWidget(parent)

{

    headColor = QColor(244, 92, 71, 200);

    bodyColor = QColor(244, 92, 71, 220);

    finColor = QColor(244, 92, 71, 150);

    tailColor = QColor(244, 92, 71, 180);

    baseColor = QColor(244, 92, 71);

    finMove = false;

    speed = 30;

    wave = 1.0;

    currentAngle = 0.0;

    currentValue = 0;

    headLen = 10;

    finLen = headLen * 1.8;

    bodyLen = headLen * 5.2;

    tailLen = headLen * 0.8;

    timer = new QTimer(this);

    connect(timer, SIGNAL(timeout()), this, SLOT(updateValue()));

    timer->start(100);

}

MagicFish::~MagicFish()

{

    if (timer->isActive()) {

        timer->stop();

    }

}

void MagicFish::resizeEvent(QResizeEvent *)

{

    headLen = qMin(width(), height()) / 10.0;

    bodyLen = headLen * 5.2;

    finLen = headLen * 1.8;

    tailLen = headLen * 0.8;

}

void MagicFish::paintEvent(QPaintEvent *)

{

    //绘制准备工作,启用反锯齿

    QPainter painter(this);

    painter.setRenderHint(QPainter::Antialiasing);

    QPointF middlePos = QPointF(width() / 2, height() / 2);

    headPos = calcPoint(middlePos, bodyLen / 1.5, currentAngle);

    double angle = currentAngle + qSin(qDegreesToRadians(currentValue * 1.2 * wave)) * 2;

    QPointF pos = calcPoint(headPos, bodyLen, angle - 180);

    //绘制头部

    drawHead(&painter);

    //绘制鱼身

    drawBody(&painter, pos, angle);

    //绘制左侧鱼鳍

    QPointF leftPos = calcPoint(headPos, headLen * 0.9, angle + 110);

    drawFin(&painter, leftPos, true, angle);

    //绘制右侧鱼鳍

    QPointF rightPos = calcPoint(headPos, headLen * 0.9, angle - 110);

    drawFin(&painter, rightPos, false, angle);

    //绘制鱼尾

    drawTail(&painter, pos, angle);

}

void MagicFish::drawHead(QPainter *painter)

{

    painter->save();

    painter->setPen(Qt::NoPen);

    painter->setBrush(headColor);

    //鱼头关节圆

    painter->drawEllipse(headPos, headLen, headLen);

    painter->restore();

}

void MagicFish::drawBody(QPainter *painter, const QPointF &pos, double angle)

{

    //计算身体部分四个点

    QPointF pos1 = calcPoint(headPos, headLen, angle - 80);

    QPointF pos2 = calcPoint(pos, headLen * 0.8, angle - 90);

    QPointF pos3 = calcPoint(pos, headLen * 0.8, angle + 90);

    QPointF pos4 = calcPoint(headPos, headLen, angle + 80);

    QPointF leftPos = calcPoint(headPos, bodyLen * 0.56, angle - 130);

    QPointF rightPos = calcPoint(headPos, bodyLen * 0.56, angle + 130);

    //计算绘制路径

    QPainterPath path;

    path.moveTo(pos1);

    path.quadTo(leftPos, pos2);

    path.lineTo(pos3);

    path.quadTo(rightPos, pos4);

    path.lineTo(pos1);

    painter->save();

    painter->setPen(Qt::NoPen);

    painter->setBrush(bodyColor);

    painter->drawPath(path);

    painter->restore();

}

void MagicFish::drawFin(QPainter *painter, const QPointF &pos, bool left, double angle)

{

    double controlAngle = 115;

    double finAngle = finMove ? qSin(qDegreesToRadians(currentValue * 16.1 * wave)) * 12.0 : 2;

    QPointF endPos = calcPoint(pos, finLen, left ? angle + finAngle + 180 : angle - finAngle - 180);

    QPointF controlPos = calcPoint(pos, finLen * 1.8, left ? angle + controlAngle + finAngle : angle - controlAngle - finAngle);

    //计算鱼鳍的路径

    QPainterPath path;

    path.moveTo(pos);

    path.quadTo(controlPos, endPos);

    path.lineTo(pos);

    painter->save();

    painter->setPen(Qt::NoPen);

    painter->setBrush(finColor);

    painter->drawPath(path);

    painter->restore();

}

void MagicFish::drawTail(QPainter *painter, const QPointF &pos, double angle)

{

    double flag = 0.6;

    double length = tailLen * (flag + 1);

    double tailAngle = angle + qCos(qDegreesToRadians(currentValue * 1.5 * wave)) * 15;

    QPointF endPos = calcPoint(pos, length, tailAngle - 180);

    QPointF pos1 = calcPoint(pos, tailLen, tailAngle - 90);

    QPointF pos2 = calcPoint(endPos, tailLen * flag, tailAngle - 90);

    QPointF pos3 = calcPoint(endPos, tailLen * flag, tailAngle + 90);

    QPointF pos4 = calcPoint(pos, tailLen, tailAngle + 90);

    QPainterPath path;

    path.moveTo(pos1);

    path.lineTo(pos2);

    path.lineTo(pos3);

    path.lineTo(pos4);

    painter->save();

    painter->setPen(Qt::NoPen);

    painter->setBrush(tailColor);

    //鱼尾关节大圆

    painter->drawEllipse(pos, tailLen, tailLen);

    //鱼尾关节小圆

    painter->drawEllipse(endPos, tailLen * flag, tailLen * flag);

    //鱼尾肉部分路径

    painter->drawPath(path);

    painter->restore();

    //绘制鱼尾关节

    drawTail1(painter, endPos, tailAngle);

}

void MagicFish::drawTail1(QPainter *painter, const QPointF &pos, double angle)

{

    double len = tailLen * 0.6;

    double flag = 0.4;

    double length = len * (flag + 2.7);

    double tailAngle = angle + qSin(qDegreesToRadians(currentValue * 1.7 * wave)) * 35;

    QPointF endPos = calcPoint(pos, length, tailAngle - 180);

    QPointF pos1 = calcPoint(pos, len, tailAngle - 90);

    QPointF pos2 = calcPoint(endPos, len * flag, tailAngle - 90);

    QPointF pos3 = calcPoint(endPos, len * flag, tailAngle + 90);

    QPointF pos4 = calcPoint(pos, len, tailAngle + 90);

    QPainterPath path;

    path.moveTo(pos1);

    path.lineTo(pos2);

    path.lineTo(pos3);

    path.lineTo(pos4);

    painter->save();

    painter->setPen(Qt::NoPen);

    painter->setBrush(tailColor);

    painter->drawPath(path);

    painter->restore();

    //绘制鱼尾鱼鳍

    drawTail2(painter, pos, tailAngle);

}

void MagicFish::drawTail2(QPainter *painter, const QPointF &pos, double angle)

{

    double len = tailLen * 0.6;

    double flag = 0.4;

    double length = len * (flag + 2.7);

    double tailWidth = qAbs(qSin(qDegreesToRadians(currentValue * 1.9 * wave)) * len + headLen / 5.0 * 3.0);

    QPointF endPos1 = calcPoint(pos, length, angle - 180);

    QPointF endPos2 = calcPoint(pos, length - 10, angle - 180);

    QPointF pos1 = calcPoint(endPos1, tailWidth, angle - 90);

    QPointF pos2 = calcPoint(endPos1, tailWidth, angle + 90);

    QPointF pos3 = calcPoint(endPos2, tailWidth - headLen / 1.5, angle - 90);

    QPointF pos4 = calcPoint(endPos2, tailWidth - headLen / 1.5, angle + 90);

    QPainterPath path1;

    path1.moveTo(pos);

    path1.lineTo(pos3);

    path1.lineTo(pos4);

    path1.lineTo(pos);

    QPainterPath path2;

    path2.moveTo(pos);

    path2.lineTo(pos1);

    path2.lineTo(pos2);

    path2.lineTo(pos);

    painter->save();

    painter->setPen(Qt::NoPen);

    painter->setBrush(tailColor);

    painter->drawPath(path1);

    painter->drawPath(path2);

    painter->restore();

}

QPointF MagicFish::calcPoint(const QPointF &pos, double len, double angle)

{

    double x = qCos(qDegreesToRadians(angle)) * len;

    double y = qSin(qDegreesToRadians(angle - 180)) * len;

    return QPointF(pos + QPointF(x, y));

}

double MagicFish::qDegreesToRadians(double degrees)

{

    return degrees * double(M_PI / 180);

}

double MagicFish::qRadiansToDegrees(double radians)

{

    return radians * double(180 / M_PI);

}

void MagicFish::updateValue()

{

    //值会一直递增,需要判断是否越界

    if (currentValue >= (INT_MAX - speed)) {

        currentValue = 0;

    }

    currentValue = (currentValue + speed) % 54000;

    update();

}

QColor MagicFish::getHeadColor() const

{

    return this->headColor;

}

QColor MagicFish::getBodyColor() const

{

    return this->bodyColor;

}

QColor MagicFish::getFinColor() const

{

    return this->finColor;

}

QColor MagicFish::getTailColor() const

{

    return this->tailColor;

}

QColor MagicFish::getBaseColor() const

{

    return this->baseColor;

}

bool MagicFish::getFinMove() const

{

    return this->finMove;

}

int MagicFish::getSpeed() const

{

    return this->speed;

}

double MagicFish::getWave() const

{

    return this->wave;

}

double MagicFish::getCurrentAngle() const

{

    return this->currentAngle;

}

double MagicFish::getHeadLen() const

{

    return this->headLen;

}

QPointF MagicFish::getHeadPos() const

{

    return this->headPos;

}

QSize MagicFish::sizeHint() const

{

    return QSize(200, 200);

}

QSize MagicFish::minimumSizeHint() const

{

    return QSize(20, 20);

}

void MagicFish::setHeadColor(const QColor &headColor)

{

    if (this->headColor != headColor) {

        this->headColor = headColor;

        update();

    }

}

void MagicFish::setBodyColor(const QColor &bodyColor)

{

    if (this->bodyColor != bodyColor) {

        this->bodyColor = bodyColor;

        update();

    }

}

void MagicFish::setFinColor(const QColor &finColor)

{

    if (this->finColor != finColor) {

        this->finColor = finColor;

        update();

    }

}

void MagicFish::setTailColor(const QColor &tailColor)

{

    if (this->tailColor != tailColor) {

        this->tailColor = tailColor;

        update();

    }

}

void MagicFish::setBaseColor(const QColor &baseColor)

{

    if (this->baseColor != baseColor) {

        this->baseColor = baseColor;

        //根据基准颜色设置其他颜色

        this->baseColor.setAlpha(200);

        headColor = this->baseColor;

        this->baseColor.setAlpha(220);

        bodyColor = this->baseColor;

        this->baseColor.setAlpha(150);

        finColor = this->baseColor;

        this->baseColor.setAlpha(180);

        tailColor = this->baseColor;

        update();

    }

}

void MagicFish::setFinMove(bool finMove)

{

    if (this->finMove != finMove) {

        this->finMove = finMove;

        update();

    }

}

void MagicFish::setSpeed(int speed)

{

    if (this->speed != speed) {

        this->speed = speed;

        update();

    }

}

void MagicFish::setWave(double wave)

{

    if (this->wave != wave) {

        this->wave = wave;

        update();

    }

}

void MagicFish::setCurrentAngle(double currentAngle)

{

    if (this->currentAngle != currentAngle) {

        this->currentAngle = currentAngle;

        update();

    }

}

void MagicFish::setCurrentAngle(int currentAngle)

{

    setCurrentAngle((double)currentAngle);

}

void MagicFish::setHeadLen(int headLen)

{

    if (this->headLen != headLen) {

        this->headLen = headLen;

        this->finLen = headLen * 1.8;

        this->bodyLen = headLen * 5.2;

        this->tailLen = headLen * 0.8;

        update();

    }

}

控件介绍

超过145个精美控件，涵盖了各种仪表盘、进度条、进度球、指南针、曲线图、标尺、温度计、导航条、导航栏，flatui、高亮按钮、滑动选择器、农历等。远超qwt集成的控件数量。
每个类都可以独立成一个单独的控件，零耦合，每个控件一个头文件和一个实现文件，不依赖其他文件，方便单个控件以源码形式集成到项目中，较少代码量。qwt的控件类环环相扣，高度耦合，想要使用其中一个控件，必须包含所有的代码。
全部纯Qt编写，QWidget+QPainter绘制，支持Qt4.6到Qt5.12的任何Qt版本，支持mingw、msvc、gcc等编译器，不乱码，可直接集成到Qt Creator中，和自带的控件一样使用，大部分效果只要设置几个属性即可，极为方便。
每个控件都有一个对应的单独的包含该控件源码的DEMO，方便参考使用。同时还提供一个所有控件使用的集成的DEMO。
每个控件的源代码都有详细中文注释，都按照统一设计规范编写，方便学习自定义控件的编写。
每个控件默认配色和demo对应的配色都非常精美。
超过130个可见控件，6个不可见控件。
部分控件提供多种样式风格选择，多种指示器样式选择。
所有控件自适应窗体拉伸变化。
集成自定义控件属性设计器，支持拖曳设计，所见即所得，支持导入导出xml格式。
自带activex控件demo，所有控件可以直接运行在ie浏览器中。
集成fontawesome图形字体+阿里巴巴iconfont收藏的几百个图形字体，享受图形字体带来的乐趣。
所有控件最后生成一个dll动态库文件，可以直接集成到qtcreator中拖曳设计使用。

SDK下载

SDK下载链接：https://pan.baidu.com/s/1tD9v1YPfE2fgYoK6lqUr1Q 提取码：lyhk
自定义控件+属性设计器欣赏：https://pan.baidu.com/s/1l6L3rKSiLu_uYi7lnL3ibQ 提取码：tmvl
下载链接中包含了各个版本的动态库文件，所有控件的头文件，使用demo。
自定义控件插件开放动态库dll使用（永久免费），无任何后门和限制，请放心使用。
目前已提供26个版本的dll，其中包括了qt5.12.3 msvc2017 32+64 mingw 32+64 的。
不定期增加控件和完善控件，不定期更新SDK，欢迎各位提出建议，谢谢！
widget版本（QQ：517216493）qml版本（QQ：373955953）三峰驼（QQ：278969898）。

巴特西