void graph2_1::paintEvent(QPaintEvent *)
{
/***********�����α߿���������**************/
QPainter *painter=new QPainter(this);
painter->setRenderHint(QPainter::Antialiasing,true);
painter->drawRect(10,10,380,230);
QPoint beginPoint(50,200);
QPoint xEndPoint(xEndX,xEndY);
QPoint yEndPoint(yEndX,yEndY);
painter->drawLine(beginPoint,xEndPoint);
painter->drawLine(beginPoint,yEndPoint);
//*****************����������ͷ*********/
int xOffset=13;
brush.setColor(Qt::black);
brush.setStyle(Qt::SolidPattern);
painter->setBrush(brush);
QPoint xarrowRightPoint(xEndX+xOffset,xEndY);
QPoint xarrowTopPoint(xEndX,-xOffset*tan(PI/6)+xEndY);
QPoint xarrowBotPoint(xEndX,xOffset*tan(PI/6)+xEndY);
static const QPoint xarrowPoints[3] = {
xarrowRightPoint,xarrowTopPoint,xarrowBotPoint,
};
painter->drawPolygon(xarrowPoints,3);
QPoint yarrowTopPoint(yEndX,yEndY-xOffset);
QPoint yarrowRightPoint(xOffset*tan(PI/6)+yEndX,yEndY);
QPoint yarrowLeftPoint(-xOffset*tan(PI/6)+yEndX,yEndY);
static const QPoint yarrowPoints[3] = {
yarrowTopPoint,yarrowLeftPoint,yarrowRightPoint,
};
painter->drawPolygon(yarrowPoints,3);
painter->setBrush(Qt::NoBrush);
/************��ע������**********/
painter->drawText(xEndX,xEndY+20,tr("HZ"));
//painter->rotate(270);
painter->drawText(yEndY,yEndX+20,tr("dB"));
//painter->rotate(90);
/*************************/
QVector<qreal> dashes;
qreal space = 3;
dashes << 5 << space << 5 << space;
pen.setDashPattern(dashes);
pen.setWidth(2);
pen.setColor(Qt::blue);
painter->setPen(pen);
QPoint point5(90,200);
QPoint point6(100,155);
QPoint point7(250,110);
QPoint point8(300,80);
painter->drawPath(drawBezierCurve(point5,point6));
painter->drawPath(drawBezierCurve(point6,point7));
painter->drawPath(drawBezierCurve(point7,point8));
}
void ellipse::paintEvent(QPaintEvent *)
{
QPainter painter(this);
QPen pen;
painter.translate(600, 300);
int xEndX=590;
int xEndY=0;
int yEndX=0;
int yEndY=-280;
int xOffset=13;
int yOffset=13;
QPoint beginPoint(-590,0);
QPoint xEndPoint(xEndX,xEndY);
QPoint yEndPoint(yEndX,yEndY);
painter.drawLine(beginPoint,xEndPoint);
QPoint beginPoint2(0,290);
painter.drawLine(beginPoint2,yEndPoint);
for(int i=-550;i<600;i+=50)
{
beginPoint.setX(i);
beginPoint.setY(0);
beginPoint2.setX(i);
beginPoint2.setY(-5);
painter.drawLine(beginPoint2,beginPoint);
char x[10];
sprintf(x,"%d",i);
painter.drawText(i+1,15,x);
}
for(int i=-250;i<300;i+=50)
{
beginPoint.setX(0);
beginPoint.setY(0-i);
beginPoint2.setX(5);
beginPoint2.setY(0-i);
painter.drawLine(beginPoint2,beginPoint);
char x[10];
sprintf(x,"%d",0-i);
if(i!=0)
{ painter.drawText(-25,i,x);}
}
QPoint xArrowsLeftPoint(xEndX,xEndY);
QPoint xArrowsTopPoint(xEndX-xOffset,-xOffset*tan(PI/6));
QPoint xArrowsBotPoint(xEndX-xOffset,xOffset*tan(PI/6));
static const QPoint xArrowsPoints[3] = {
xArrowsLeftPoint,xArrowsTopPoint,xArrowsBotPoint,
};
painter.setBrush(QBrush(Qt::black,Qt::SolidPattern));
painter.drawPolygon(xArrowsPoints,3);
painter.drawText(xEndX-20,xEndY-20,tr("X轴"));
QPoint yArrowsBotPoint(yEndX,yEndY-yOffset);
QPoint yArrowsRightPoint(yOffset*tan(PI/6),yEndY);
QPoint yArrowsLeftPoint(-yOffset*tan(PI/6),yEndY);
static const QPoint yArrowsPoints[3] = {
yArrowsBotPoint,yArrowsRightPoint,yArrowsLeftPoint,
};
painter.setBrush(QBrush(Qt::black,Qt::SolidPattern));
painter.drawPolygon(yArrowsPoints,3);
painter.drawText(yEndX+20,yEndY+20,tr("Y轴"));
painter.setPen(Qt::blue);
paintEvent2(0,shortr);
painter.drawPoints(pointf1, 4);
int ry=shortr;
int rx=longr;
long p0 = ry*ry-rx*rx*ry+0.25*rx*rx;
long x0 =0,y0 = ry;
while(ry*ry*x0<rx*rx*y0)
{
x0++;
if(p0<0)
{
p0 = p0 +2*ry*ry*x0+ry*ry;
}
else
{
y0--;
p0 = p0+2*ry*ry*x0-2*rx*rx*y0+ry*ry;
}
paintEvent2(x0,y0);
painter.drawPoints(pointf1, 4);
}
p0 = ry*ry*(x0+0.5)*(x0+0.5)+rx*rx*(y0-1)*(y0-1)-rx*rx*ry*ry;
while(y0>0)
{
y0--;
if(p0>0)
{
p0 = p0 -2*rx*rx*y0+rx*rx;
}
else
{
x0++;
p0 = p0 +2*ry*ry*x0-2*rx*rx*y0+rx*rx;
}
paintEvent2(x0,y0);
painter.drawPoints(pointf1, 4);
}
}
