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

1. 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。
2. 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。
3. 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。
4. 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。
5. 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。
6. 每个控件默认配色和demo对应的配色都非常精美。
7. 超过130个可见控件，6个不可见控件。
8. 部分控件提供多种样式风格选择，多种指示器样式选择。
9. 所有控件自适应窗体拉伸变化。
10. 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。
11. 自带activex控件demo，所有控件可以直接运行在ie浏览器中。
12. 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。
13. 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）。

Qt编写自定义控件18-魔法小鱼

原文：https://www.cnblogs.com/feiyangqingyun/p/10841283.html