QT QWidget 爱心灯

简介

就是使用QTableWidget生成一个LED点阵, 使用网上的Arduino点阵数组, 应用在此；

代码

LEDWidget.h

#ifndef LEDWIDGET_H
#define LEDWIDGET_H


#include <QWidget>


class LEDWidget : public QWidget
{
public:
    LEDWidget(QWidget *parent = nullptr);

    inline void controlLed(bool on=false)
    {
        if (on != m_on)
        {
             m_on = on;
             update();
        }
    }
    inline void toggleLed()
    {
        m_on = !m_on;
        update();
    }

protected:
    void paintEvent(QPaintEvent *event) override;

    bool m_on;
};


#endif // LEDWIDGET_H

LEDWidget.cpp

#include "ledwidget.h"
#include <QPainter>
#include <QColor>
#include <QPen>


LEDWidget::LEDWidget(QWidget *parent)
    : QWidget(parent), m_on(false)
{

}

void LEDWidget::paintEvent(QPaintEvent *)
{
    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing);

    QPen pen;
    pen.setColor(QColor(128, 128, 128)); // 设置线颜色为浅灰色
    painter.setPen(pen);

    // 设置LED灯的颜色和大小
//        QColor ledColor(85, 239, 196); // 红色
    int ledSize = std::max(20, width() >= height() ? height() - 10 : width() - 10);
    QLinearGradient gradient(0, 0, width(), height());
    if (m_on)
    {
        gradient.setColorAt(0, "#43e97b");
        gradient.setColorAt(1, "#38f9d7");
    }
    else
    {
        gradient.setColorAt(0, "#e6e9f0");
        gradient.setColorAt(1, "#eef1f5");
    }

    painter.setBrush(gradient);

    // 计算LED灯的位置
    int x = (width() - ledSize) / 2;
    int y = (height() - ledSize) / 2;

    // 绘制LED灯的主体
//        painter.setBrush(ledColor);
    painter.drawEllipse(x, y, ledSize, ledSize);
}

爱心点阵代码

    int table[64] =
    {
      0, 0, 0, 0, 0, 0, 0, 0,
      0, 1, 1, 0, 0, 1, 1, 0,
      1, 1, 1, 1, 1, 1, 1, 1,
      1, 1, 1, 1, 1, 1, 1, 1,
      1, 1, 1, 1, 1, 1, 1, 1,
      0, 1, 1, 1, 1, 1, 1, 0,
      0, 0, 1, 1, 1, 1, 0, 0,
      0, 0, 0, 1, 1, 0, 0, 0,
    };

    ui->tableWidget->setRowCount(8);
    ui->tableWidget->setColumnCount(8);

    for (int r = 0; r < ui->tableWidget->rowCount(); ++r)
    {
        for  (int l = 0; l < ui->tableWidget->columnCount(); ++l)
        {
            MarqueeLED *wgt = new MarqueeLED(ui->tableWidget->rowCount()*5 + l);
            wgt->controlLed(table[ui->tableWidget->rowCount()*r + l]);
            ui->tableWidget->setColumnWidth(l, 100);
            ui->tableWidget->setRowHeight(l, 100);
            ui->tableWidget->setCellWidget(r, l, wgt);
        }
    }

完整代码

效果

参考

QT QWidget - 跑马灯

QT Widget - 随便画个圆