83 lines
2.4 KiB
C++
83 lines
2.4 KiB
C++
#include "frmsmoothcurve.h"
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#include "ui_frmsmoothcurve.h"
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#include "smoothcurve.h"
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#include "qpainter.h"
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#include "qdatetime.h"
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#include "qdebug.h"
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#define TIMEMS QTime::currentTime().toString("hh:mm:ss zzz")
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frmSmoothCurve::frmSmoothCurve(QWidget *parent) : QWidget(parent), ui(new Ui::frmSmoothCurve)
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{
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ui->setupUi(this);
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//初始化随机数种子
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srand(QDateTime::currentDateTime().toMSecsSinceEpoch());
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//随机生成曲线上的点
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int x = -300;
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while (x < 300) {
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datas << QPointF(x, rand() % 300 - 100);
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x += qMin(rand() % 30 + 5, 300);
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}
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//正常曲线
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pathNormal.moveTo(datas.at(0));
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for (int i = 1; i < datas.size(); ++i) {
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pathNormal.lineTo(datas.at(i));
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}
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//平滑曲线1
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//qDebug() << TIMEMS << "createSmoothCurve start";
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pathSmooth1 = SmoothCurve::createSmoothCurve(datas);
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//qDebug() << TIMEMS << "createSmoothCurve stop";
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//平滑曲线2
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//qDebug() << TIMEMS << "createSmoothCurve2 start";
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pathSmooth2 = SmoothCurve::createSmoothCurve2(datas);
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//qDebug() << TIMEMS << "createSmoothCurve2 stop";
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ui->ckShowPoint->setChecked(true);
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connect(ui->ckShowPoint, SIGNAL(clicked(bool)), this, SLOT(update()));
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connect(ui->rbtnPathNormal, SIGNAL(clicked(bool)), this, SLOT(update()));
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connect(ui->rbtnPathSmooth1, SIGNAL(clicked(bool)), this, SLOT(update()));
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connect(ui->rbtnPathSmooth2, SIGNAL(clicked(bool)), this, SLOT(update()));
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}
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frmSmoothCurve::~frmSmoothCurve()
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{
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delete ui;
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}
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void frmSmoothCurve::paintEvent(QPaintEvent *)
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{
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QPainter painter(this);
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painter.setRenderHint(QPainter::Antialiasing);
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painter.translate(width() / 2, height() / 2);
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painter.scale(1, -1);
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//画坐标轴
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painter.setPen(QColor(180, 180, 180));
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painter.drawLine(-250, 0, 250, 0);
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painter.drawLine(0, 150, 0, -150);
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//根据选择绘制不同的曲线路径
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painter.setPen(QPen(QColor(80, 80, 80), 2));
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if (ui->rbtnPathSmooth1->isChecked()) {
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painter.drawPath(pathSmooth1);
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} else if (ui->rbtnPathSmooth2->isChecked()) {
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painter.drawPath(pathSmooth2);
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} else {
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painter.drawPath(pathNormal);
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}
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//如果曲线上的点可见则显示出来
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if (ui->ckShowPoint->isChecked()) {
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painter.setPen(Qt::black);
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painter.setBrush(Qt::gray);
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foreach (QPointF point, datas) {
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painter.drawEllipse(point, 3, 3);
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}
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}
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}
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