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#include <QtGui>

#include <math.h>

#include <stdlib.h>

#include "basictoolsplugin.h"

const float Pi = 3.14159f;

//! [0]

QStringList BasicToolsPlugin::brushes() const

{

    return QStringList() << tr("Pencil") << tr("Air Brush")

                         << tr("Random Letters");

}

//! [0]

//! [1]

QRect BasicToolsPlugin::mousePress(const QString &brush, QPainter &painter,

                                   const QPoint &pos)

{

    return mouseMove(brush, painter, pos, pos);

}

//! [1]

//! [2]

QRect BasicToolsPlugin::mouseMove(const QString &brush, QPainter &painter,

                                  const QPoint &oldPos, const QPoint &newPos)

{

    painter.save();

    int rad = painter.pen().width() / 2;

    QRect boundingRect = QRect(oldPos, newPos).normalized()

                                              .adjusted(-rad, -rad, +rad, +rad);

    QColor color = painter.pen().color();

    int thickness = painter.pen().width();

    QColor transparentColor(color.red(), color.green(), color.blue(), 0);

//! [2] //! [3]

    if (brush == tr("Pencil")) {

        painter.drawLine(oldPos, newPos);

    } else if (brush == tr("Air Brush")) {

        int numSteps = 2 + (newPos - oldPos).manhattanLength() / 2;

        painter.setBrush(QBrush(color, Qt::Dense6Pattern));

        painter.setPen(Qt::NoPen);

        for (int i = 0; i < numSteps; ++i) {

            int x = oldPos.x() + i * (newPos.x() - oldPos.x()) / (numSteps - 1);

            int y = oldPos.y() + i * (newPos.y() - oldPos.y()) / (numSteps - 1);

            painter.drawEllipse(x - (thickness / 2), y - (thickness / 2),

                                thickness, thickness);

        }

    } else if (brush == tr("Random Letters")) {

        QChar ch('A' + (qrand() % 26));

        QFont biggerFont = painter.font();

        biggerFont.setBold(true);

        biggerFont.setPointSize(biggerFont.pointSize() + thickness);

        painter.setFont(biggerFont);

        painter.drawText(newPos, QString(ch));

        QFontMetrics metrics(painter.font());

        boundingRect = metrics.boundingRect(ch);

        boundingRect.translate(newPos);

        boundingRect.adjust(-10, -10, +10, +10);

    }

    painter.restore();

    return boundingRect;

}

//! [3]

//! [4]

QRect BasicToolsPlugin::mouseRelease(const QString & /* brush */,

                                     QPainter & /* painter */,

                                     const QPoint & /* pos */)

{

    return QRect(0, 0, 0, 0);

}

//! [4]

//! [5]

QStringList BasicToolsPlugin::shapes() const

{

    return QStringList() << tr("Circle") << tr("Star") << tr("Text...");

}

//! [5]

//! [6]

QPainterPath BasicToolsPlugin::generateShape(const QString &shape,

                                             QWidget *parent)

{

    QPainterPath path;

    if (shape == tr("Circle")) {

        path.addEllipse(0, 0, 50, 50);

    } else if (shape == tr("Star")) {

        path.moveTo(90, 50);

        for (int i = 1; i < 5; ++i) {

            path.lineTo(50 + 40 * cos(0.8 * i * Pi),

                        50 + 40 * sin(0.8 * i * Pi));

        }

        path.closeSubpath();

    } else if (shape == tr("Text...")) {

        QString text = QInputDialog::getText(parent, tr("Text Shape"),

                                             tr("Enter text:"),

                                             QLineEdit::Normal, tr("Qt"));

        if (!text.isEmpty()) {

            QFont timesFont("Times", 50);

            timesFont.setStyleStrategy(QFont::ForceOutline);

            path.addText(0, 0, timesFont, text);

        }

    }

    return path;

}

//! [6]

//! [7]

QStringList BasicToolsPlugin::filters() const

{

    return QStringList() << tr("Invert Pixels") << tr("Swap RGB")

                         << tr("Grayscale");

}

//! [7]

//! [8]

QImage BasicToolsPlugin::filterImage(const QString &filter, const QImage &image,

                                     QWidget * /* parent */)

{

    QImage result = image.convertToFormat(QImage::Format_RGB32);

    if (filter == tr("Invert Pixels")) {

        result.invertPixels();

    } else if (filter == tr("Swap RGB")) {

        result = result.rgbSwapped();

    } else if (filter == tr("Grayscale")) {

        for (int y = 0; y < result.height(); ++y) {

            for (int x = 0; x < result.width(); ++x) {

                int pixel = result.pixel(x, y);

                int gray = qGray(pixel);

                int alpha = qAlpha(pixel);

                result.setPixel(x, y, qRgba(gray, gray, gray, alpha));

            }

        }

    }

    return result;

}

//! [8]

QT_BEGIN_NAMESPACE

//! [9]

Q_EXPORT_PLUGIN2(pnp_basictools, BasicToolsPlugin)

//! [9]

QT_END_NAMESPACE