Qt绘制环形进度条（paintEvent）

#include "widget.h" #include "ui_widget.h" #include <QDebug> Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget) { ui->setupUi(this); this->setStyleSheet("#Widget{background:#F5F5F5;}" "QSlider::groove:horizontal{border:0px;}" "QSlider::sub-page:horizontal{background:#00BFFF;" "border-radius:2px;margin-top:8px;margin-bottom:8px;}" "QSlider::add-page:horizontal{background:#FFFFFF;border:0px;" "border-radius:2px;margin-top:8px;margin-bottom:8px;}" "QSlider::handle:horizontal{background:#87CEFA;width:20px;" "border:0px;border-radius:10px;}"); QFont font12 = QFont("Microsoft YaHei", 12, QFont::Normal); ui->label_progress->setFont(font12); ui->label_progress->setStyleSheet("color:#00BFFF;"); ui->label_size->setFont(font12); ui->label_size->setStyleSheet("color:#00BFFF;"); ui->pushButton_blue->setFont(font12); ui->pushButton_blue->setStyleSheet( "QPushButton{background:#FFFFFF;color:#00BFFF;border:1px solid #00BFFF;border-radius:2px;}" "QPushButton:hover{color:#87CEFA;border:1px solid #87CEFA;}" "QPushButton:pressed{color:#4682B4;border:1px solid #4682B4;}"); ui->pushButton_fy->setFont(font12); ui->pushButton_fy->setStyleSheet( "QPushButton{background:#FFFFFF;color:#FF8C00;border:1px solid #FF8C00;border-radius:2px;}" "QPushButton:hover{color:#FFE4C4;border:1px solid #FFE4C4;}" "QPushButton:pressed{color:#D2691E;border:1px solid #D2691E;}"); ui->pushButton_pink->setFont(font12); ui->pushButton_pink->setStyleSheet( "QPushButton{background:#FFFFFF;color:#FF69B4;border:1px solid #FF69B4;border-radius:2px;}" "QPushButton:hover{color:#FFC0CB;border:1px solid #FFC0CB;}" "QPushButton:pressed{color:#DB7093;border:1px solid #DB7093;}"); } Widget::~Widget() { delete ui; } void Widget::on_horizontalSlider_valueChanged(int value) { ui->ringProgressbar->setPersent(value); } void Widget::on_horizontalSlider_2_valueChanged(int value) { ui->ringProgressbar->setFixedSize(150 + value * 50 / 100, 150 + value * 50 / 100); } void Widget::on_pushButton_blue_clicked() { ui->label_progress->setStyleSheet("color:#00BFFF;"); ui->label_size->setStyleSheet("color:#00BFFF;"); this->setStyleSheet("#Widget{background:#F5F5F5;}" "QSlider::groove:horizontal{border:0px;}" "QSlider::sub-page:horizontal{background:#00BFFF;" "border-radius:2px;margin-top:8px;margin-bottom:8px;}" "QSlider::add-page:horizontal{background:#FFFFFF;border:0px;" "border-radius:2px;margin-top:8px;margin-bottom:8px;}" "QSlider::handle:horizontal{background:#87CEFA;width:20px;" "border:0px;border-radius:10px;}"); ui->ringProgressbar->setColor(QColor(213,240,255), QColor(0,191,255), QColor(255,255,255), QColor(0,191,255)); } void Widget::on_pushButton_fy_clicked() { ui->label_progress->setStyleSheet("color:#FF8C00;"); ui->label_size->setStyleSheet("color:#FF8C00;"); this->setStyleSheet("#Widget{background:#F5F5F5;}" "QSlider::groove:horizontal{border:0px;}" "QSlider::sub-page:horizontal{background:#FF8C00;" "border-radius:2px;margin-top:8px;margin-bottom:8px;}" "QSlider::add-page:horizontal{background:#FFFFFF;border:0px;" "border-radius:2px;margin-top:8px;margin-bottom:8px;}" "QSlider::handle:horizontal{background:#FFE4C4;width:20px;" "border:0px;border-radius:10px;}"); ui->ringProgressbar->setColor(QColor(255,228,196), QColor(255,140,0), QColor(255,255,255), QColor(255,140,0)); } void Widget::on_pushButton_pink_clicked() { ui->label_progress->setStyleSheet("color:#FF69B4;"); ui->label_size->setStyleSheet("color:#FF69B4;"); this->setStyleSheet("#Widget{background:#F5F5F5;}" "QSlider::groove:horizontal{border:0px;}" "QSlider::sub-page:horizontal{background:#FF69B4;" "border-radius:2px;margin-top:8px;margin-bottom:8px;}" "QSlider::add-page:horizontal{background:#FFFFFF;border:0px;" "border-radius:2px;margin-top:8px;margin-bottom:8px;}" "QSlider::handle:horizontal{background:#FFC0CB;width:20px;" "border:0px;border-radius:10px;}"); ui->ringProgressbar->setColor(QColor(255,192,203), QColor(255,105,180), QColor(255,255,255), QColor(255,105,180)); }