basictoolsplugin.cpp Example File

tools/plugandpaint/plugins/basictools/basictoolsplugin.cpp
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#include <QtWidgets> #include <cmath> #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 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); 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; } QRect BasicToolsPlugin::mouseRelease(const QString & /* brush */, QPainter & /* painter */, const QPoint & /* pos */) { 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 * std::cos(0.8 * i * Pi), 50 + 40 * std::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; } QStringList BasicToolsPlugin::filters() const { return QStringList() << tr("Invert Pixels") << tr("Swap RGB") << tr("Grayscale"); } 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; }