scribblearea.h

利用Qt写的白板程序

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#ifndef SCRIBBLEAREA_H
#define SCRIBBLEAREA_H

#include <QColor>
#include <QImage>
#include <QPoint>
#include <QWidget>
#include <sys/signal.h>
#include "dataStruct.h"




class ScribbleArea : public QWidget
{
    Q_OBJECT

public:
    ScribbleArea(QWidget *parent = 0);

    bool openImage(const QString &fileName);
    bool saveImage(const QString &fileName, const char *fileFormat);
    void setPenColor(const QColor &newColor);
    void setPenWidth(int newWidth);

    bool isModified() const { return modified; }
    QColor penColor() const { return myPenColor; }
    int penWidth() const { return myPenWidth; }

	/*****************添加的函数*****************/


	/*
	 * 信号接收处理函数
	 */
	void sigusr(int signo);

	/********************************************/



public slots:
    void clearImage();
    void print();

protected:
    void mousePressEvent(QMouseEvent *event);
    void mouseMoveEvent(QMouseEvent *event);
    void mouseReleaseEvent(QMouseEvent *event);
    void paintEvent(QPaintEvent *event);
    void resizeEvent(QResizeEvent *event);

private:
	/******************添加的函数**********************/

	/*
	 * 读取手势轨迹的共享区的数据,并计算返回结束点的坐标
	 */
	QPoint trackPosition();

	/*
	 * 读取共享区的手的坐标的数据，并初始化lastPoint
	 */
	void InitPoint();

	/**************************************************/


    void drawLineTo(const QPoint &endPoint);
    void resizeImage(QImage *image, const QSize &newSize);
    bool modified;
    bool scribbling;
    int myPenWidth;
    QColor myPenColor;
    QImage image;
    QPoint lastPoint;
};

#endif