Qt quick 2 paint方法没有被调用

Question

我创建了一个简单的Qt快速应用程序,我有一个问题用QQuickPaintedItem绘图.如果调用了paint,我检查了调试模式,但没有.无论如何这是我的代码:

资源:

ParticleHandler::ParticleHandler(QQuickPaintedItem *parent) : QQuickPaintedItem(parent)
{
    setFlag(QQuickItem::ItemHasContents);
    particle = new Particle();
}
void ParticleHandler::paint(QPainter *painter)
{
    QPen pen = QPen(m_color);
    painter->setPen(pen);
    painter->setRenderHints(QPainter::Antialiasing, true);
    painter->drawEllipse(particle->Position.x,particle->Position.y,particle->Radius/2,particle->Radius/2);
}

标题:

ParticleHandler(QQuickPaintedItem *parent = 0);
void paint(QPainter *painter);

Answer 1

尝试设置自定义项目的宽度和高度.

import QtQuick 2.0
import Fizika 1.0
Rectangle
{
  width: 360
  height: 360
  Particle
    { 
     width: 100
     height: 100
     radius: 20
     x: 100
     y: 200
     color: "red"
    }
}