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#include <QtGui>

#include "renderarea.h"

//! [0]

RenderArea::RenderArea(QWidget *parent)

    : QWidget(parent)

{

    QFont newFont = font();

    newFont.setPixelSize(12);

    setFont(newFont);

    QFontMetrics fontMetrics(newFont);

    xBoundingRect = fontMetrics.boundingRect(tr("x"));

    yBoundingRect = fontMetrics.boundingRect(tr("y"));

}

//! [0]

//! [1]

void RenderArea::setOperations(const QList<Operation> &operations)

{

    this->operations = operations;

    update();

}

//! [1]

//! [2]

void RenderArea::setShape(const QPainterPath &shape)

{

    this->shape = shape;

    update();

}

//! [2]

//! [3]

QSize RenderArea::minimumSizeHint() const

{

    return QSize(182, 182);

}

//! [3]

//! [4]

QSize RenderArea::sizeHint() const

{

    return QSize(232, 232);

}

//! [4]

//! [5]

void RenderArea::paintEvent(QPaintEvent *event)

{

    QPainter painter(this);

    painter.setRenderHint(QPainter::Antialiasing);

    painter.fillRect(event->rect(), QBrush(Qt::white));

    painter.translate(66, 66);

//! [5]

//! [6]

    painter.save();

    transformPainter(painter);

    drawShape(painter);

    painter.restore();

//! [6]

//! [7]

    drawOutline(painter);

//! [7]

//! [8]

    transformPainter(painter);

    drawCoordinates(painter);

}

//! [8]

//! [9]

void RenderArea::drawCoordinates(QPainter &painter)

{

    painter.setPen(Qt::red);

    painter.drawLine(0, 0, 50, 0);

    painter.drawLine(48, -2, 50, 0);

    painter.drawLine(48, 2, 50, 0);

    painter.drawText(60 - xBoundingRect.width() / 2,

                     0 + xBoundingRect.height() / 2, tr("x"));

    painter.drawLine(0, 0, 0, 50);

    painter.drawLine(-2, 48, 0, 50);

    painter.drawLine(2, 48, 0, 50);

    painter.drawText(0 - yBoundingRect.width() / 2,

                     60 + yBoundingRect.height() / 2, tr("y"));

}

//! [9]

//! [10]

void RenderArea::drawOutline(QPainter &painter)

{

    painter.setPen(Qt::darkGreen);

    painter.setPen(Qt::DashLine);

    painter.setBrush(Qt::NoBrush);

    painter.drawRect(0, 0, 100, 100);

}

//! [10]

//! [11]

void RenderArea::drawShape(QPainter &painter)

{

    painter.fillPath(shape, Qt::blue);

}

//! [11]

//! [12]

void RenderArea::transformPainter(QPainter &painter)

{

    for (int i = 0; i < operations.size(); ++i) {

        switch (operations[i]) {

        case Translate:

            painter.translate(50, 50);

            break;

        case Scale:

            painter.scale(0.75, 0.75);

            break;

        case Rotate:

            painter.rotate(60);

            break;

        case NoTransformation:

        default:

            ;

        }

    }

}

//! [12]