请写一段qt绘制梯形折线图的代码
时间: 2023-04-06 21:01:20 浏览: 207
以下是一段 Qt 绘制梯形折线图的代码:
```cpp
void Widget::paintEvent(QPaintEvent *event)
{
QPainter painter(this);
painter.setRenderHint(QPainter::Antialiasing, true);
// 定义数据
QVector<QPointF> data;
data << QPointF(0, 0) << QPointF(1, 2) << QPointF(2, 1) << QPointF(3, 3) << QPointF(4, 2);
// 定义画笔
QPen pen(Qt::blue);
pen.setWidth(2);
painter.setPen(pen);
// 定义画刷
QBrush brush(Qt::blue);
brush.setStyle(Qt::SolidPattern);
painter.setBrush(brush);
// 绘制梯形折线图
for (int i = 0; i < data.size() - 1; i++) {
QPointF p1 = data.at(i);
QPointF p2 = data.at(i + 1);
QPointF p3(p2.x(), 0);
QPointF p4(p1.x(), 0);
QVector<QPointF> points;
points << p1 << p2 << p3 << p4;
painter.drawPolygon(points);
}
}
```
希望能对你有所帮助!