basictoolsplugin.cpp Example File | Qt 4.8 (original) (raw)

tools/plugandpaintplugins/basictools/basictoolsplugin.cpp

#include

#include <math.h> #include <stdlib.h>

#include "basictoolsplugin.h"

const float Pi = 3.14159f;

QStringList BasicToolsPlugin::brushes() const { return QStringList() << tr("Pencil") << tr("Air Brush") << tr("Random Letters"); }

QRect BasicToolsPlugin::mousePress(const QString &brush, QPainter &painter, const QPoint &pos) { return mouseMove(brush, painter, pos, pos); }

QRect BasicToolsPlugin::mouseMove(const QString &brush, QPainter &painter, const QPoint &oldPos, const QPoint &newPos) { painter.save();

int rad = painter.pen().width() / 2;
[QRect](qrect.html) boundingRect = [QRect](qrect.html)(oldPos, newPos).normalized()
                                          .adjusted(-rad, -rad, +rad, +rad);
[QColor](qcolor.html) color = painter.pen().color();
int thickness = painter.pen().width();
[QColor](qcolor.html) transparentColor(color.red(), color.green(), color.blue(), 0);

if (brush == tr("Pencil")) {
    painter.drawLine(oldPos, newPos);
} else if (brush == tr("Air Brush")) {
    int numSteps = 2 + (newPos - oldPos).manhattanLength() / 2;

    painter.setBrush([QBrush](qbrush.html)(color, [Qt](qt-module.html)::Dense6Pattern));
    painter.setPen([Qt](qt-module.html)::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](qchar.html) ch('A' + (qrand() % 26));

    [QFont](qfont.html) biggerFont = painter.font();
    biggerFont.setBold(true);
    biggerFont.setPointSize(biggerFont.pointSize() + thickness);
    painter.setFont(biggerFont);

    painter.drawText(newPos, [QString](qstring.html)(ch));

    [QFontMetrics](qfontmetrics.html) metrics(painter.font());
    boundingRect = metrics.boundingRect(ch);
    boundingRect.translate(newPos);
    boundingRect.adjust(-10, -10, +10, +10);
}
painter.restore();
return boundingRect;

}

QRect BasicToolsPlugin::mouseRelease(const QString & , QPainter & , const QPoint & ) { return QRect(0, 0, 0, 0); }

QStringList BasicToolsPlugin::shapes() const { return QStringList() << tr("Circle") << tr("Star") << tr("Text..."); }

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](qstring.html) text = [QInputDialog](qinputdialog.html)::getText(parent, tr("Text Shape"),
                                         tr("Enter text:"),
                                         [QLineEdit](qlineedit.html)::Normal, tr("Qt"));
    if (!text.isEmpty()) {
        [QFont](qfont.html) timesFont("Times", 50);
        timesFont.setStyleStrategy([QFont](qfont.html)::ForceOutline);
        path.addText(0, 0, timesFont, text);
    }
}

return path;

}

QStringList BasicToolsPlugin::filters() const { return QStringList() << tr("Invert Pixels") << tr("Swap RGB") << tr("Grayscale"); }

QImage BasicToolsPlugin::filterImage(const QString &filter, const QImage &image, QWidget * ) { 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](qcolor.html#qGray)(pixel);
            int alpha = [qAlpha](qcolor.html#qAlpha)(pixel);
            result.setPixel(x, y, [qRgba](qcolor.html#qRgba)(gray, gray, gray, alpha));
        }
    }
}
return result;

}

Q_EXPORT_PLUGIN2(pnp_basictools, BasicToolsPlugin)

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