2

我必须创建一个简单的框，它可以根据来自horizo​​ntalSlider/spinBox 的值旋转一个椭圆和一些文本。小部件必须可调整大小，并且椭圆的大小必须根据此改变。

现在只绘制椭圆。如果可行，将添加文本绘画。问题是如果resize后的窗口超过了原来的窗口大小，画出来就很奇怪了。

窗口.h：

#ifndef WINDOW_H
#define WINDOW_H

#include <QtGui>
#include "ui_form.h"

class Window : public QWidget, private Ui::Form
{
    Q_OBJECT

public:
    Window(QWidget *parent = 0);

public slots:
    void rotateEllip(int angle);
    void rotateText(int angle);

protected:
    void paintEvent(QPaintEvent *event);
};

#endif // WINDOW_H

窗口.cpp：

#include "window.h"

qreal textAngle = 0.0;

qreal ellipAngle = 0.0;

Window::Window(QWidget *parent) : QWidget(parent)
{
    setupUi(this);

    connect(spinBox_ellipse,SIGNAL(valueChanged(int)),this,SLOT(rotateEllip(int)));
    connect(horizontalSlider_ellipse,SIGNAL(valueChanged(int)),this,SLOT(rotateEllip(int)));
    connect(spinBox_text,SIGNAL(valueChanged(int)),this,SLOT(rotateText(int)));
    connect(horizontalSlider_text,SIGNAL(valueChanged(int)),this,SLOT(rotateText(int)));
}

void Window::rotateEllip(int angle)
{
    ellipAngle = (qreal) angle;
    Window::Window(this);
}

void Window::rotateText(int angle) 
{
    textAngle = (qreal) angle;
    Window::Window(this);
}

void Window::paintEvent(QPaintEvent *event) 
{
    QPen pen(Qt::black,2,Qt::SolidLine);
    QPoint center(0,0);

    QPainter painter(this);

    painter.setRenderHint(QPainter::Antialiasing);
/*    Drawing ellipse*/


    painter.eraseRect(10,10,frame_ellipse->width(),frame_ellipse->height());
    painter.translate(frame_ellipse->width()/2+10,frame_ellipse->height()/2+10);
    painter.rotate(ellipAngle);
    if (frame_ellipse->width() > frame_ellipse->height()) painter.drawEllipse(center,(frame_ellipse->height()/4)-5,(frame_ellipse->height()/2)-10);
    else if (frame_ellipse->width() <= frame_ellipse->height() ) painter.drawEllipse(center,(frame_ellipse->width()/2)-10,(frame_ellipse->width()/4)-5);
    painter.rotate(-ellipAngle);
    painter.translate(-frame_ellipse->width()/2+10,-frame_ellipse->height()/2+10);
}

main.cpp 是正常的 window.show() 调用。

4

1 回答 1

1

我的猜测是对构造函数的调用会创建一个临时的小部件对象并弄乱绘图。

于 2010-06-04T20:02:38.810 回答