plotter.cpp

#include "plotter.h"
#include <math.h>
#include <QPainter>
#include <QBrush>
#include <QPen>
#include <QColor>
#include <QMouseEvent>

Plotter::Plotter(QWidget *parent) : QWidget(parent){
    freq = 1;
    ampl = 1.0;
    velocidade = 0.0;
    teta = 0.0;
    startTimer(100);
    setMouseTracking(true); // habilita o rastreio do mouse
}

void Plotter::timerEvent(QTimerEvent *e, std::vector<int>& data){
    teta += velocidade;
    repaint();
}

void Plotter::setVelocidade(int velocidade){
    this->velocidade = velocidade/100.0;
}

void Plotter::paintEvent(QPaintEvent *e){
    QPainter painter(this);
    QBrush brush;
    QPen pen;
    int x1, y1, x2, y2;

    // habilita o anti-aliasing
    painter.setRenderHint(QPainter::Antialiasing);

    // define as props do preenchimento
    brush.setColor(QColor(255,255,0));
    brush.setStyle(Qt::SolidPattern);

    // define as props da caneta
    pen.setColor(QColor(255,0,0));
    pen.setWidth(2);

    // comunica as mudancas ao objeto painter
    painter.setBrush(brush);
    painter.setPen(pen);

    // desenha um retangulo
    painter.drawRect(0,0,width(), height());

    // atualiza as propriedades da caneta
    pen.setColor(QColor(0,0,0));
    pen.setWidth(2);

    // atualiza a caneta e desenha o eixo
    // horizontal
    painter.setPen(pen);
    painter.drawLine(0, height()/2, width(), height()/2);

    // atualiza as propriedades da caneta
    pen.setColor(QColor(0,0,255));
    pen.setWidth(1);

    // atualiza a caneta e desenha o eixo
    // horizontal
    painter.setPen(pen);


    // primeiro ponto
    x1 = 0;
    y1 = height()/2-height()/2*ampl*sin(2*M_PI*freq*x1+teta);

    // desenha na tela
    for(int i=1; i<width(); i++){
        x2 = i;
        y2 = height()/2-height()/2*ampl*sin(2*M_PI*(freq*x2)/width()+teta);
        painter.drawLine(x1, y1, x2, y2);
        x1 = x2;
        y1 = y2;
    }
}

void Plotter::setAmplitude(int ampl){
    this->ampl = ampl/100.0;
    repaint();
}

void Plotter::setFrequencia(int freq){
    this->freq = freq/10.0;
    repaint();
}