forked from openkylin/quarkai
243 lines
10 KiB
C++
243 lines
10 KiB
C++
/*
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* Copyright (C) 2013 ~ 2018 National University of Defense Technology(NUDT) & Tianjin Kylin Ltd.
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*
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* Authors:
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* Kobe Lee xiangli@ubuntukylin.com/kobe24_lixiang@126.com
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 3.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "cpuballwidget.h"
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#include <QApplication>
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#include <QDebug>
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#include <QPainter>
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#include <QImageReader>
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#include <QGraphicsDropShadowEffect>
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#include <QtMath>
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qreal gradientDistance(qreal x)
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{
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return (1 - qCos(M_PI * x)) / 2;
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}
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CpuBallWidget::CpuBallWidget(QWidget *parent) : QWidget(parent)
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{
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this->setFixedSize(210, 210);
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m_frontImagePath = "://res/wave_front.png";
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m_backimagePath = "://res/wave_back.png";
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m_xFrontOffset = 0;
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m_xBackOffset = this->width();
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m_prevPercentValue = 0.0;
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m_percentValue = 0.0;
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m_progressText = QString("%1%").arg(QString::number(m_percentValue, 'f', 1));
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m_shadowEffect = new QGraphicsDropShadowEffect(this);
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m_shadowEffect->setOffset(0, 3);
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m_shadowEffect->setColor(QColor(232, 232, 232, 127));
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m_shadowEffect->setBlurRadius(10);
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this->setGraphicsEffect(m_shadowEffect);
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this->loadWaveImage();
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m_waveTimer = new QTimer(this);
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connect(m_waveTimer, SIGNAL(timeout()), this, SLOT(onRepaintWaveImage()));
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m_waveTimer->setInterval(200);
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m_animationIndex = 0;
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m_animationCounts = 2000/200;//2000为数据更新的时间间隔，200为波浪更新的时间间隔
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}
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CpuBallWidget::~CpuBallWidget()
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{
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delete m_shadowEffect;
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if (m_waveTimer) {
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disconnect(m_waveTimer, SIGNAL(timeout()), this, SLOT(onRepaintWaveImage()));
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if(m_waveTimer->isActive()) {
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m_waveTimer->stop();
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}
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delete m_waveTimer;
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m_waveTimer = nullptr;
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}
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}
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void CpuBallWidget::loadWaveImage()
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{
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QImageReader frontReader(m_frontImagePath);
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int w = frontReader.size().width();
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int h = frontReader.size().height();
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// w = w * this->width() / 100;
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// h = h * this->height() / 100;
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QImage image(w, h, QImage::Format_ARGB32_Premultiplied);//QImage::Format_ARGB32
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image.fill(Qt::transparent);
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image.load(m_frontImagePath);
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/*QPainter painter(&image);
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// painter.setCompositionMode(QPainter::CompositionMode_Source);
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// painter.fillRect(image.rect(), Qt::transparent);
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// painter.setCompositionMode(QPainter::CompositionMode_SourceOver);
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painter.drawImage(QPoint(0,0), image);
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painter.end();*/
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m_frontImage = image;
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QImageReader backReader(m_backimagePath);
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w = backReader.size().width();
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h = backReader.size().height();
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// w = w * this->width() / 100;
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// h = h * this->height() / 100;
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QImage backImage(w, h, QImage::Format_ARGB32_Premultiplied);//QImage::Format_ARGB32
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backImage = backImage.scaled(QSize(w, h), Qt::KeepAspectRatio, Qt::SmoothTransformation);
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backImage.fill(Qt::transparent);
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backImage.load(m_backimagePath);
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/*QPainter backPainter(&backImage);
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// backPainter.setCompositionMode(QPainter::CompositionMode_Source);
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// backPainter.fillRect(image.rect(), Qt::transparent);
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// backPainter.setCompositionMode(QPainter::CompositionMode_SourceOver);
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backPainter.drawImage(QPoint(0,0), backImage);
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backPainter.end();*/
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m_backImage = backImage;
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}
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void CpuBallWidget::onRepaintWaveImage()
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{
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m_xFrontOffset += 2;
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m_xBackOffset += 2;
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if (m_xFrontOffset > m_frontImage.width()) {//保留整个显示直径的大小不做处理，避免出现断层
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m_xFrontOffset = 0;
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}
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if (m_xBackOffset > m_backImage.width()) {//保留整个显示直径的大小不做处理，避免出现断层
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m_xBackOffset = 0;
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}
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if (m_animationIndex < m_animationCounts) {
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m_animationIndex++;
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repaint();
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} else {
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m_waveTimer->stop();
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}
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// this->update();//this->repaint();
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}
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//value:0 ~ 100
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void CpuBallWidget::updateCpuPercent(double value)
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{
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if (this->m_percentValue == value || value > 100 || value < 0) {
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return;
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}
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m_prevPercentValue = m_percentValue;
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m_percentValue = value;
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m_progressText = QString("%1%").arg(QString::number(value, 'f', 1));
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m_animationIndex = 0;
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m_waveTimer->start();
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}
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void CpuBallWidget::startTimer()
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{
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// if (this->m_waveTimer && !this->m_waveTimer->isActive())
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// this->m_waveTimer->start();
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}
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void CpuBallWidget::stopTimer()
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{
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// if (this->m_waveTimer && this->m_waveTimer->isActive())
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// this->m_waveTimer->stop();
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}
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//在不同的平台上得到一样的效果，但绘制的文字除外
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void CpuBallWidget::paintEvent(QPaintEvent *)
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{
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QPainter painter(this);
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painter.setRenderHint(QPainter::Antialiasing, true);//设置反走样，避免锯齿
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QRectF rect = QRectF(0, 0, this->width(), this->height());
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QSize waveSize = this->size();
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// int currentPercent = static_cast<int>(m_percentValue);
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double percent = m_prevPercentValue + gradientDistance(m_animationIndex / m_animationCounts) * (m_percentValue - m_prevPercentValue);
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int currentPercent = static_cast<int>(percent);
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//Step1:整个矩形背景
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QImage waveRectImage = QImage(waveSize, QImage::Format_ARGB32_Premultiplied);//创建一个Format_ARGB32_Premultiplied 格式的QIamge，大小和控件相同
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QPainter wavePainter(&waveRectImage);//创建一个QPainter绘制waveRectImage这个图像
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wavePainter.setRenderHint(QPainter::Antialiasing, true);//setRenderHint() 来设置反走样，要么绘制出来的线条会出现锯齿
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// wavePainter.initFrom(this);//用控件的设置初始化画笔，刷子和字体
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wavePainter.setCompositionMode(QPainter::CompositionMode_Source);//输出源像素，避免整个矩形背景区域出现花屏现象
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if (currentPercent > 88) {
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m_shadowEffect->setColor(QColor(255, 0, 0, 127));//红色
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} else if (currentPercent > 55) {
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m_shadowEffect->setColor(QColor(255, 193, 37, 127));//黄
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} else {
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m_shadowEffect->setColor(QColor(232, 232, 232, 127));//灰
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}
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wavePainter.fillRect(waveRectImage.rect(), QColor(255, 255, 255, 127));
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//Step2:波浪区域
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//CompositionMode_SourceOver保证波浪出现的时候其背景为通明的
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wavePainter.setCompositionMode(QPainter::CompositionMode_SourceOver);//混和模式QImage::CompositionMode_SourceOver ，即原象素（正在绘制的象素）和目标象素（已经存在的象素）混和，原象素的alpha分量定义为最终的透明度
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wavePainter.drawImage(static_cast<int>(m_xBackOffset), (100 - currentPercent)*this->width()/100, m_backImage);
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wavePainter.drawImage(static_cast<int>(m_xBackOffset) - m_backImage.width(), (100 - currentPercent)*this->width()/100, m_backImage);
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wavePainter.drawImage(static_cast<int>(m_xFrontOffset), (100 - currentPercent)*this->width()/100, m_frontImage);
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wavePainter.drawImage(static_cast<int>(m_xFrontOffset) - m_frontImage.width(), (100 - currentPercent)*this->width()/100, m_frontImage);
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//Step3:矩形区域中圆球的外径
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/*QRectF outRect = QRectF(0, 0, waveSize.width(), waveSize.height());
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QPainterPath outBorderPath;
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//QMargins定义了矩形的四个外边距量，left,top,right和bottom，描述围绕矩形的边框宽度
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outBorderPath.addEllipse(outRect.marginsRemoved(QMarginsF(0.5, 0.5, 0.5, 0.5)));//marginsAdded:增长矩形的边距，扩大它
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wavePainter.strokePath(outBorderPath, QPen(QColor("#0f84bc"), 1));//外边框*/
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//QGradient支持三种渐变画刷：线性渐变(QLinearGradient)、辐射渐变(QRadialGradient)、角度渐变(QConicalGradient)
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QRectF outRect = QRectF(0, 0, waveSize.width(), waveSize.height());
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QConicalGradient conicalGradient(waveSize.width()/2, waveSize.height()/2, waveSize.width());//参数分别为中心坐标和初始角度
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conicalGradient.setColorAt(0, QColor("#59aee2"));
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conicalGradient.setColorAt(1.0, QColor("#0f84bc"));
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wavePainter.setPen(QPen(QBrush(conicalGradient), 1));
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wavePainter.drawEllipse(outRect.marginsRemoved(QMarginsF(0.5, 0.5, 0.5, 0.5)));
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//Step4:占用率文字描述
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QFont font = wavePainter.font();
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font.setPixelSize(44);//waveSize.height() * 20 / this->height()
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wavePainter.setFont(font);
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wavePainter.setPen(Qt::white);
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wavePainter.drawText(QRect(rect.x(), rect.y() + rect.height()*2/3, rect.width(), rect.height()/3), Qt::AlignHCenter, m_progressText);
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wavePainter.end();
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QImage image = QImage(waveSize, QImage::Format_ARGB32_Premultiplied);
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QPainter m_painter(&image);
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//让矩形框中除掉圆形球以外的其他区域透明
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m_painter.setCompositionMode(QPainter::CompositionMode_Source);//输出源像素，避免区域出现花屏现象
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m_painter.fillRect(image.rect(), Qt::transparent);
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//为圆形球绘制一个圆形的白色遮罩层,目的是让矩形除了圆形区域外，其他区域为透明的没有任何东西显示在上面，方便后面的圆球和波浪的显示
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QPixmap maskPixmap(waveSize);
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maskPixmap.fill(Qt::transparent);
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QPainterPath path;
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path.addEllipse(QRectF(0, 0, waveSize.width(), waveSize.height()));
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QPainter maskPainter(&maskPixmap);
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maskPainter.setRenderHint(QPainter::Antialiasing, true);
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maskPainter.setPen(QPen(Qt::white, 1));
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maskPainter.fillPath(path, QBrush(Qt::white));
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m_painter.setCompositionMode(QPainter::CompositionMode_SourceOver);//默认模式,源的alpha将目标顶部的像素混合
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m_painter.drawImage(0, 0, maskPixmap.toImage());
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m_painter.setCompositionMode(QPainter::CompositionMode_SourceIn);//输出是源，其中alpha被目标的值减少 设置画刷的组合模式CompositionMode_SourceIn这个模式为目标图像在下
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m_painter.drawImage(0, 0, waveRectImage);
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m_painter.setCompositionMode(QPainter::CompositionMode_DestinationOver);//目标的alpha用于将其混合到源像素的顶部。这种模式是QPainter::CompositionMode_Source逆
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m_painter.end();
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painter.drawImage(this->rect(), image);//drawPixmap
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}
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