[SOLVED] Removing paint event and Repaint!

[MrNoway]

Hi, guys, it's me again,
first of all I really wanna thank you all for helping me, I appreciate it.

here comes my next problem.
I fnally succeeded drawing a perfect sinus with dots.
i gave my sinus even a little random look using rand();

http://s1.directupload.net/images/121206/iiug9xcy.jpg
or
http://img713.imageshack.us/img713/3548/drawpots.jpg

so I what I need is, after reaching the horizontal dot a certain value,
I want to delete the painted line/curve/dots and painting again.

here is how it looks so far.

It would also work, just take the drawn dots and change their x and y values,
but I dont know how to do this.

HEADER

@#include <qwidget>
#include <math.h>

class Lines : public QWidget
{
Q_OBJECT
QTimer *timer1;
QVector<QPoint> m_points;
QVector<QPoint> m_2points;
double vertical;
double vertical2;
double horizontal;
double counter;
double counter2;
double random_a;
double random_b;

public:
Lines(QWidget *parent = 0);

protected:
void paintEvent(QPaintEvent *event);
void drawLines(QPainter *qp);

public slots:
void call_repaint();

};
@

MAIN
@#include <qpainter>
#include "prototype.h"
#include <qpainter.h>
#include <qtimer.h>
#include <Windows.h>
#include <math.h>
#include <iostream>
#include <iomanip>
using namespace std;

Lines::Lines(QWidget *parent) : QWidget(parent)
{
counter = 0;
counter2 = 1;
vertical=0;
vertical2=0;
horizontal=0;
random_a=0.05;

  timer1=new QTimer(this);
timer1->setInterval(10);
timer1->start();

connect(timer1, SIGNAL(timeout()), this, SLOT(call_repaint()));

}

void Lines::paintEvent(QPaintEvent *e)
{
Q_UNUSED(e);
QPainter ppp(this);
drawLines(&ppp);
}

void Lines::call_repaint(){
srand(time(NULL));
horizontal++;
double xxx;
double yyy;

xxx=sin(counter);
yyy=sin(counter2);

counter=counter+0.05;
counter2=counter2+random_a;

vertical = vertical + (xxx2);
vertical2 = vertical2 + (yyy1);

// !!!! Drawing
m_points.append(QPoint(2+horizontal,50+vertical));
m_2points.append(QPoint(2+horizontal,195+vertical2));
repaint();}

// !!!!! Changing Sinus
if ( horizontal == 150 )
{random_a = rand ()10 +1;random_a = random_a / 80; }

// !!!!! Changing Sinus
if ( horizontal == 400 )
{srand(time(NULL)); random_a = rand () +1; random_a = random_a / 80; }
// !!!!! After Reaching a certain value I want to draw again from the beginning
if ( horizontal == 800){horizontal = 0;}

void Lines::drawLines(QPainter *qp)
{

QPen pen(Qt::black, 2, Qt::SolidLine);
qp->setPen(pen);

QPoint pt;
foreach(pt, m_points)
{
    qp->drawPoint(pt);
}

foreach(pt, m_2points)
{
qp->drawPoint(pt);
}}@

I posted the whole code, so maybe someone can learn from it.
Some parts were little tricky with the sinus.

[MrNoway]

wow, I am pretty sure, this is the wrong way to code this

but you can simply create a new

@QVector<QPoint> m_3points;@

and then
@
if ( horizontal == 800){
m_2points = m_3points;
}@

then it just disappears, cool