授人以鱼不如授人以渔2-QT圆形刻度盘或者进度条以及扇形和圆环各种计算公式
添加圆环。这次应该比较全了，其他的背景图啥的贴个image等图片进去也好了，把这些就算都清清楚楚的写出来
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QLabel>
#include <QMainWindow>
#include <QPainter>
#include <qtimer.h>
namespace Ui {
class MainWindow;
}
typedef enum tagDrawType
{
Line = 1,
Circle = 2
}DrawType;
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
void paintEvent(QPaintEvent *event);
void DrawBkLine(QPainter* painter);
void DrawBkCircle(QPainter* painter);
void DrawBkCircle2(QPainter* painter);
void gradientArc(QPainter *painter, int radius, double startAngle, int angleLength, int arcHeight, QRgb color);
public slots:
void SetValue();
private:
Ui::MainWindow *ui;
QLabel *l1;
QLabel *l2;
QLabel *l3;
int u;
QTimer t;
};
#endif // MAINWINDOW_H
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <math.h>
#include <QPainter>
#include <QLibrary>
//当前值
//最大刻度
const int nMax = 100;
//最小刻度
const int nMin = 0;
//旋转角度
const double nPercentRotate = 60;
//
const int nMaxRadus = 150;
const int nMinRadus = 100;
const int nDistance = 0;
//最外面的大圆
const int nDistance2 = 0;
//原点
int nOrgXpos = 0;
int nOrgYpos = 0;
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
u = 50;
nOrgXpos = width() / 2;
nOrgYpos = height() / 2;
l1 = new QLabel(this);
l1->setText(QString("%1%").arg(QString::number(u)));
l1->move(nOrgXpos ,nOrgYpos );
l2 = new QLabel(this);
l3 = new QLabel(this);
//l2->setText(QString("Min0%"));
//这个地方要注意
//l2->move(nOrgXpos - nMinRadus, nOrgYpos + nMinRadus );
// l3->setText(QString("Max100%"));
//l3->move(nOrgXpos+ (nMinRadus ) , nOrgYpos +(nMinRadus ) );
t.setInterval(100);
connect(&t, SIGNAL(timeout()), this, SLOT(SetValue( )));
t.start();
}
MainWindow::~MainWindow()
{
t.stop();
delete ui;
}
void MainWindow::SetValue()
{
if(u == nMax) {u = 0; };
u++;
l1->setText(QString("%1%").arg(QString::number(u)));
}
/**
* 参数二：半径
* 参数三：开始的角度
* 参数四：指扫取的角度 - 顺时针
* 参数五：圆环的高度
* 参数六：填充色
**/
void MainWindow::gradientArc(QPainter *painter,
int radius,
double startAngle,
int angleLength,
int arcHeight,
QRgb color)
{
// 渐变色
QRadialGradient gradient(0, 0, radius);
gradient.setColorAt(0, Qt::white);
gradient.setColorAt(1.0, color);
painter->setBrush(gradient);
QRectF rect(-radius, -radius, radius << 1, radius << 1);
QPainterPath path;
path.arcTo(rect, startAngle, angleLength);
QPainterPath subPath;
subPath.addEllipse(rect.adjusted(arcHeight, arcHeight, -arcHeight, -arcHeight));
// path为扇形 subPath为椭圆
path -= subPath;
painter->setPen(Qt::darkBlue);
painter->drawPath(path);
}
//圆环画法
void MainWindow::DrawBkCircle2(QPainter* painter)
{
painter->save();
painter->setRenderHint(QPainter::Antialiasing, true);
// >> 1（右移1位）相当于width() / 2
painter->translate(nOrgXpos + 2 * nMaxRadus, nOrgYpos );
painter->setPen(QColor(122,122,77));
int arcHeight = nMaxRadus - nMinRadus;
double b = (360.0 / (nMax - nMin)); //根据实际最大最小值计算单位度数
double a = u * b;
gradientArc(painter, nMaxRadus,0, 360 , arcHeight, qRgb(211, 40, 100));
gradientArc(painter, nMaxRadus,-0, -a, arcHeight, qRgb(22, 200, 10));
painter->restore();;
update();
}
//饼图
void MainWindow::DrawBkCircle(QPainter* painter)
{
painter->save();
painter->translate(nOrgXpos + 2 * nMaxRadus, nOrgYpos);
painter->setRenderHint(QPainter::Antialiasing, true);
//painter->translate(width() >> 1, height() >> 1);
painter->setPen(QColor(122,122,77));
int arcHeight = nMaxRadus - nMinRadus;
double b = (360.0 / (nMax - nMin));
double a = u * b;
QRadialGradient gradient(0, 0, nMaxRadus);
gradient.setColorAt(0, Qt::blue);
gradient.setColorAt(1.0, QColor(55,222,122));
painter->setBrush(gradient);
QRectF rect_top(-nMaxRadus, -nMaxRadus, nMaxRadus << 1, nMaxRadus << 1);
//乘以16是换算
painter->drawPie(rect_top, 0 * 16, -a * 16);
//painter.setPen(QColor(122,222,122));
gradient.setColorAt(0, Qt::white);
gradient.setColorAt(1.0, QColor(122,22,22));
painter->setBrush(gradient);
painter->drawPie(rect_top,-a * 16, -(360-a) * 16);
painter->restore();
update();
}
//刻度盘
void MainWindow::DrawBkLine(QPainter* p)
{
QColor use(112,222,121);
QColor nouse(223,123,111);
double nRotate = (360.0 - 2 * nPercentRotate) / (nMax - nMin);
p->setRenderHint(QPainter::Antialiasing);
p->setRenderHint(QPainter::SmoothPixmapTransform);
p->save();
p->translate(nOrgXpos, nOrgYpos);
p->rotate(nPercentRotate);
p->setPen(use);
for(int i = 0 ; i <= u; i++){
p->drawLine(0,nMinRadus,0,nMaxRadus);
p->rotate(nRotate);
}
p->setPen(nouse);
for(int i = u + 1 ; i <= nMax ; i++){
p->drawLine(0,nMinRadus,0,nMaxRadus);
p->rotate(nRotate);
}
p->restore();
p->save();
QPen pen(QColor(111,222,33));
p->setPen(pen);
p->drawEllipse(nOrgXpos - nMinRadus + nDistance/2, nOrgYpos- nMinRadus+ nDistance/2 , nMinRadus * 2 - nDistance , nMinRadus * 2 - nDistance );
p->restore();
pen.setColor(QColor(255,5,6));
//pen.setWidth(26);
p->setPen(pen);
p->drawEllipse(nOrgXpos -nMaxRadus - nDistance2/2, nOrgYpos-nMaxRadus -nDistance2/2 , nMaxRadus * 2 + nDistance2, nMaxRadus * 2 + nDistance2);
p->restore();
p->save();
//表针的画法
p->translate(nOrgXpos, nOrgYpos);
pen.setColor(QColor(2,33,133));
// pen.setWidth(0.1);
p->setPen(pen);
p->rotate(nPercentRotate);
p->rotate(u * nRotate);
p->drawLine(0, 0, 0, nMinRadus);
p->restore();
l1->setText(QString("%1%").arg(QString::number(u)));
update();
}
void MainWindow::paintEvent(QPaintEvent *event)
{
// setAttribute(Qt::WA_OpaquePaintEvent);
QPixmap pixmap = QPixmap(size());
pixmap.fill(this, 0, 0);
QPainter painter(this);
//painter.initFrom(this);
DrawBkLine(&painter);
DrawBkCircle(&painter);
DrawBkCircle2(&painter);
//painter.drawPixmap(0, 0, pixmap);
}
ｗｏｗ 楼主好强势啊 大神级别，咯咯。
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