机器人控制代码（Wifi-mobile-robot-program-master）的阅读

私有波形绘制的类，指定widget的painter即可，通过在mainwidow中的eventfileter中中的过滤消息来处理widget的updte消息。与直接在一个widget类中实现接口稍微不同。

ui->tem_widget->setBackgroundRole(QPalette::Shadow);

ui->tem_widget->setAutoFillBackground(true);

if(obj == ui->tem_widget

&& event->type() == QEvent::Paint)

{

QPainter painter(ui->tem_widget);

mPainter->setAxes(20,30,ui->MQ9_widget->width()-10,

ui->MQ9_widget->height()-20);

mPainter->setCurve2(false);

mPainter->setY_axes(40);

mPainter->setDataBuff(tem_curvebuff,temBuffer2);

mPainter->setTitle("Temperature");

mPainter->setPainter(&painter);

mPainter->paint();

}

class mCurvePaint : public QObject

{

Q_OBJECT

public:

mCurvePaint(QObject* parent= 0);

void setPainter(QPainter* widget);

void setDataBuff(char* buff1 , char* buff2);

void setDataBuff_num(int buff1 , int buff2);

void setAxes(int x11, int y11, int x22, int y22);

void setAxescolor(Qt::GlobalColor color);

void setAxesstyle(Qt::PenStyle penstyle);

void setAxeswidth(qreal k);

void setAxespen(QPen pen);

void setTitle(QString s);

void setTitlecolor(Qt::GlobalColor color);

void setTitlestyle(Qt::PenStyle penstyle);

void setTitlewidth(qreal k);

void setTitlepen(QPen pen);

void setRuler(bool r);

void setRulercolor(Qt::GlobalColor color);

void setRulerstyle(Qt::PenStyle penstyle);

void setRulerwidth(qreal k);

void setRulerpen(QPen pen);

void setY_axes(int h);

void setY_axescolor(Qt::GlobalColor color);

void setY_axesstyle(Qt::PenStyle penstyle);

void setY_axeswidth(qreal k);

void setY_axespen(QPen pen);

void setX_axes(int w);

void setX_axescolor(Qt::GlobalColor color);

void setX_axesstyle(Qt::PenStyle penstyle);

void setX_axeswidth(qreal k);

void setX_axespen(QPen pen);

void setCurve1(bool r);

void setCurve1color(Qt::GlobalColor color);

void setCurve1style(Qt::PenStyle penstyle);

void setCurve1width(qreal k);

void setCurve1pen(QPen pen);

void setCurve2(bool r);

void setCurve2color(Qt::GlobalColor color);

void setCurve2style(Qt::PenStyle penstyle);

void setCurve2width(qreal k);

void setCurve2pen(QPen pen);

void paint();

private:

QPainter* painter;

int x1,x2,y1,y2;

int width,height;

char* Buffer1;

char* Buffer2;

int numbuff1,numbuff2;

QString title;

Qt::GlobalColor titlecolor,

axescolor;

QPen titlePen,axesPen,rulerPen,Y_axesPen,X_axesPen,

curve1pen,curve2pen;

bool isRuleron,isCurve1on,isCurve2on;

QPointF myTransform(qreal x , qreal y);

};

效果图：