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#include "scribblewidget.h"

ScribbleWidget::ScribbleWidget(QWidget *parent)

    : QWidget(parent)

{

    scribbling = false;

}

void ScribbleWidget::resizeEvent(QResizeEvent *e)

{

    image = QImage(e->size(), QImage::Format_RGB32);

    image.fill(QColor(Qt::white).rgb());

}

void ScribbleWidget::mousePressEvent(QMouseEvent *event)

{

    if (event->button() != Qt::LeftButton)

        return;

    lastPoint = event->pos();

    scribbling = true;

}

void ScribbleWidget::mouseMoveEvent(QMouseEvent *event)

{

    if ((event->buttons() & Qt::LeftButton) && scribbling)

        drawLineTo(event->pos());

}

void ScribbleWidget::mouseReleaseEvent(QMouseEvent *event)

{

    if (event->button() == Qt::LeftButton && scribbling) {

        drawLineTo(event->pos());

        scribbling = false;

    }

}

void ScribbleWidget::paintEvent(QPaintEvent *)

{

    QPainter painter(this);

    painter.drawImage(QPoint(0, 0), image);

}

void ScribbleWidget::drawLineTo(const QPoint &endPoint)

{

    QPainter painter(&image);

    painter.setPen(QPen(Qt::blue, 1, Qt::SolidLine,

                        Qt::RoundCap, Qt::RoundJoin));

    painter.drawLine(lastPoint, endPoint);

    update();

    lastPoint = endPoint;

}