cannonfield.cpp

来自「奇趣公司比较新的qt/emd版本」· C++ 代码 · 共 68 行

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#include <QPainter>

#include "cannonfield.h"

CannonField::CannonField(QWidget *parent)
    : QWidget(parent)
{
    currentAngle = 45;
    setPalette(QPalette(QColor(250, 250, 200)));
    setAutoFillBackground(true);
}

void CannonField::setAngle(int angle)
{
    if (angle < 5)
        angle = 5;
    if (angle > 70)
        angle = 70;
    if (currentAngle == angle)
        return;
    currentAngle = angle;
    update();
    emit angleChanged(currentAngle);
}

void CannonField::paintEvent(QPaintEvent * /* event */)
{
    QPainter painter(this);
    painter.drawText(200, 200,
                     tr("Angle = ") + QString::number(currentAngle));
}