/*
 * mandellabel.cpp
 *
 * This file is covered by the LICENSE file in the root of this project.
 */

#include <QPainter>

#include "mandellabel.h"
#include "qevent.h"

MandelLabel::MandelLabel(BigintMandelWidget *parent)
:   QLabel(parent),
    settings(parent->get_settings()),
    draw_progress(-1),
    zoom_rect_center(-1, -1) {
    setMouseTracking(true);
}

static inline QRect get_rect(QSize size, QPoint pos, int zoom_factor) {
    QSize scaled_size(size.width() / zoom_factor, size.height() / zoom_factor);
    return QRect(
        QPoint(
            pos.x() - scaled_size.width() / 2,
            pos.y() - scaled_size.height() / 2
        ),
        scaled_size
    );
}

void MandelLabel::paintEvent(QPaintEvent *event) {
    QPixmap pixmap;
    QPainter qp;
    int zoom_factor = settings->get_zoom_factor();
    bool draw_zoom_rect = (
        zoom_factor != -1
        && zoom_rect_center.x() != -1
        && zoom_rect_center.y() != -1
    );
    pixmap = settings->get_pixmap();
    if (draw_progress != -1 || draw_zoom_rect) {
        qp.begin(&pixmap);
        if (draw_progress != -1) {
            qp.setPen(Qt::GlobalColor::gray);
            qp.drawLine(0, draw_progress, pixmap.width() - 1, draw_progress);
        }
        if (draw_zoom_rect) {
            qp.setPen(Qt::GlobalColor::gray);
            qp.drawRect(
                get_rect(
                    pixmap.size(),
                    zoom_rect_center,
                    zoom_factor
                )
            );
        }
        qp.end();
    }
    resize(pixmap.size());
    setPixmap(pixmap);
    QLabel::paintEvent(event);
}

void MandelLabel::leaveEvent(QEvent *event) {
    zoom_rect_center = QPoint(-1, -1);
}

void MandelLabel::mouseMoveEvent(QMouseEvent *event) {
    zoom_rect_center = event->pos();
}