QT绘制led灯

#include <QtGui> #include "hled.h" struct HLed::Private { public: Private() : darkerFactor(300), color(Qt::green), isOn(true) { } int darkerFactor; QColor color; bool isOn; }; HLed::HLed(QWidget *parent) :QWidget(parent), m_d(new Private) { } HLed::~HLed() { delete m_d; } QColor HLed::color() const { return m_d->color; } void HLed::setColor(const QColor &color) { if (m_d->color == color) return; update(); } QSize HLed::sizeHint() const { return QSize(20, 20); } QSize HLed::minimumSizeHint() const { return QSize(16, 16); } void HLed::toggle() { m_d->isOn = !m_d->isOn; update(); } void HLed::turnOn(bool on) { m_d->isOn = on; update(); } void HLed::turnOff(bool off) { turnOn(!off); } void HLed::paintEvent(QPaintEvent* /* event*/) { int width = ledWidth(); QPainter painter(this); painter.setRenderHint(QPainter::Antialiasing); QColor color = m_d->isOn ? m_d->color : m_d->color.darker(m_d->darkerFactor); QBrush brush; brush.setStyle(Qt::SolidPattern); brush.setColor(color); painter.setBrush(brush); // draw plain painter.drawEllipse(1, 1, width-1, width-1); QPen pen; pen.setWidth(2); int pos = width / 5 + 1; int lightWidth = width * 2 / 3; int lightQuote = 130 * 2 / (lightWidth ? lightWidth : 1) + 100; // draw bright spot while (lightWidth) { color = color.lighter(lightQuote); pen.setColor(color); painter.setPen(pen); painter.drawEllipse(pos, pos, lightWidth, lightWidth); lightWidth--; if (!lightWidth) break; painter.drawEllipse(pos, pos, lightWidth, lightWidth); lightWidth--; if (!lightWidth) break; painter.drawEllipse(pos, pos, lightWidth, lightWidth); pos++; lightWidth--; } //draw border painter.setBrush(Qt::NoBrush); int angle = -720; color = palette().color(QPalette::Light); for (int arc=120; arc<2880; arc+=240) { pen.setColor(color); painter.setPen(pen); int w = width - pen.width()/2; painter.drawArc(pen.width()/2, pen.width()/2, w, w, angle+arc, 240); painter.drawArc(pen.width()/2, pen.width()/2, w, w, angle-arc, 240); color = color.darker(110); } } int HLed::ledWidth() const { int width = qMin(this->width(), this->height()); width -= 2; return width > 0 ? width : 0; }