#include "my_paint_widget.hh"
#include <iostream>

#include <QMouseEvent>
#include <QPen>
#include <QPainter>
#include <QImage>
#include <QPixmap>

MyPaintWidget::MyPaintWidget() {
  old_x = -1;
  old_y = -1;
  _image = NULL;
  _painting = NULL;
  _pen_color = Qt::white;
}

int MyPaintWidget::loadImage(const char* filename) {
  _image = new QPixmap();
  if (! _image->load(filename)) {
    std::cout << "Error loading " << filename << std::endl;
    return  1; // throw exception
  }
  std::cout << "width x height: " << _image->width() << " x " << _image->height() << std::endl;

#ifdef SLOW
  _painting = new QImage(_image->size(), QImage::Format_ARGB32_Premultiplied);
  _painting->fill(QColor(Qt::transparent).value());
#else
  _painting = new QPixmap(_image->size());
  _painting->fill(QColor(Qt::transparent));
  //     _painting->fill(QColor(Qt::white));
#endif
  setPixmap(*_image);
//   this->resize(_image->size());
 return 0;
}

void MyPaintWidget::clearPainting(void) {
  _painting->fill(QColor(Qt::transparent).value());
  update();
}

void MyPaintWidget::mousePressEvent(QMouseEvent *e) {
  old_x = e->x();
  old_y = e->y();
}

void MyPaintWidget::setPenColor(QColor color) {
  _pen_color = color;
}

void MyPaintWidget::mouseMoveEvent(QMouseEvent *e) {
  if (e->buttons() == Qt::LeftButton) {
    QPainter painter(_painting);
    painter.setPen(QPen(QBrush(_pen_color), 3 , Qt::SolidLine)) ;
    painter.drawLine(old_x, old_y, e->x(), e->y());
    old_x = e->x();
    old_y = e->y();
    update();
  }
}

void MyPaintWidget::paintEvent(QPaintEvent *event) {
  QPainter painter(this);
  painter.drawPixmap(0, 0, *_image);
#ifdef SLOW
  painter.drawImage(0, 0, *_painting);
#else
  painter.drawPixmap(0, 0, *_painting);
#endif
}