69 lines
1.9 KiB
C++
69 lines
1.9 KiB
C++
|
#include "frmsmoothcurve.h"
|
|||
|
|
#include "ui_frmsmoothcurve.h"
|
|||
|
|
#include "smoothcurve.h"
|
|||
|
|
#include "qpainter.h"
|
|||
|
|
#include "qdatetime.h"
|
|||
|
|
#include "qdebug.h"
|
|||
|
|
|
|||
|
|
frmSmoothCurve::frmSmoothCurve(QWidget *parent) : QWidget(parent), ui(new Ui::frmSmoothCurve)
|
|||
|
|
{
|
|||
|
|
ui->setupUi(this);
|
|||
|
|
|
|||
|
|
//初始化随机数种子
|
|||
|
|
qsrand(QDateTime::currentDateTime().toMSecsSinceEpoch());
|
|||
|
|
|
|||
|
|
//随机生成曲线上的点
|
|||
|
|
int x = -300;
|
|||
|
|
while (x < 300) {
|
|||
|
|
datas << QPointF(x, qrand() % 300 - 100);
|
|||
|
|
x += qMin(qrand() % 30 + 5, 300);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
//根据曲线上的点创建平滑曲线
|
|||
|
|
smoothCurve = SmoothCurve::createSmoothCurve(datas);
|
|||
|
|
|
|||
|
|
// 直接连接点的创建非平滑曲线曲线
|
|||
|
|
smoothCurve2.moveTo(datas[0]);
|
|||
|
|
for (int i = 1; i < datas.size(); ++i) {
|
|||
|
|
smoothCurve2.lineTo(datas[i]);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
connect(ui->showKnotsCheckBox, SIGNAL(clicked(bool)), this, SLOT(update()));
|
|||
|
|
connect(ui->showSmoothCurveCheckBox, SIGNAL(clicked(bool)), this, SLOT(update()));
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
frmSmoothCurve::~frmSmoothCurve()
|
|||
|
|
{
|
|||
|
|
delete ui;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
void frmSmoothCurve::paintEvent(QPaintEvent *)
|
|||
|
|
{
|
|||
|
|
QPainter painter(this);
|
|||
|
|
painter.setRenderHint(QPainter::Antialiasing);
|
|||
|
|
painter.translate(width() / 2, height() / 2);
|
|||
|
|
painter.scale(1, -1);
|
|||
|
|
|
|||
|
|
//画坐标轴
|
|||
|
|
painter.setPen(QColor(180, 180, 180));
|
|||
|
|
painter.drawLine(-250, 0, 250, 0);
|
|||
|
|
painter.drawLine(0, 150, 0, -150);
|
|||
|
|
|
|||
|
|
//被选中时显示平滑曲线,否则显示非平滑曲线
|
|||
|
|
painter.setPen(QPen(QColor(80, 80, 80), 2));
|
|||
|
|
if (ui->showSmoothCurveCheckBox->isChecked()) {
|
|||
|
|
painter.drawPath(smoothCurve);
|
|||
|
|
} else {
|
|||
|
|
painter.drawPath(smoothCurve2);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
//如果曲线上的点可见则显示出来
|
|||
|
|
if (ui->showKnotsCheckBox->isChecked()) {
|
|||
|
|
painter.setPen(Qt::black);
|
|||
|
|
painter.setBrush(Qt::gray);
|
|||
|
|
foreach (QPointF p, datas) {
|
|||
|
|
painter.drawEllipse(p, 3, 3);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|