| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
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| ** This file is part of the examples of the Qt Toolkit. |
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| ** $QT_BEGIN_LICENSE:BSD$ |
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| ****************************************************************************/ |
| |
| |
| #include "paintarea.h" |
| #include "interfaces.h" |
| |
| #include <QMouseEvent> |
| #include <QPainter> |
| |
| PaintArea::PaintArea(QWidget *parent) : QWidget(parent) |
| { |
| setAttribute(Qt::WA_StaticContents); |
| setAttribute(Qt::WA_OpaquePaintEvent); |
| |
| theImage.fill(qRgb(255, 255, 255)); |
| } |
| |
| bool PaintArea::openImage(const QString &fileName) |
| { |
| QImage image; |
| if (!image.load(fileName)) |
| return false; |
| |
| setImage(image); |
| return true; |
| } |
| |
| bool PaintArea::saveImage(const QString &fileName, const char *fileFormat) |
| { |
| return theImage.save(fileName, fileFormat); |
| } |
| |
| void PaintArea::setImage(const QImage &image) |
| { |
| theImage = image.convertToFormat(QImage::Format_RGB32); |
| update(); |
| updateGeometry(); |
| } |
| |
| void PaintArea::insertShape(const QPainterPath &path) |
| { |
| pendingPath = path; |
| #ifndef QT_NO_CURSOR |
| setCursor(Qt::CrossCursor); |
| #endif |
| } |
| |
| void PaintArea::setBrushColor(const QColor &color) |
| { |
| this->color = color; |
| } |
| |
| void PaintArea::setBrushWidth(int width) |
| { |
| thickness = width; |
| } |
| |
| //! [0] |
| void PaintArea::setBrush(BrushInterface *brushInterface, const QString &brush) |
| { |
| this->brushInterface = brushInterface; |
| this->brush = brush; |
| } |
| //! [0] |
| |
| QSize PaintArea::sizeHint() const |
| { |
| return theImage.size(); |
| } |
| |
| void PaintArea::paintEvent(QPaintEvent * /* event */) |
| { |
| QPainter painter(this); |
| painter.drawImage(QPoint(0, 0), theImage); |
| } |
| |
| void PaintArea::mousePressEvent(QMouseEvent *event) |
| { |
| if (event->button() == Qt::LeftButton) { |
| if (!pendingPath.isEmpty()) { |
| QPainter painter(&theImage); |
| setupPainter(painter); |
| |
| const QRectF boundingRect = pendingPath.boundingRect(); |
| QLinearGradient gradient(boundingRect.topRight(), |
| boundingRect.bottomLeft()); |
| gradient.setColorAt(0.0, QColor(color.red(), color.green(), |
| color.blue(), 63)); |
| gradient.setColorAt(1.0, QColor(color.red(), color.green(), |
| color.blue(), 191)); |
| painter.setBrush(gradient); |
| painter.translate(event->pos() - boundingRect.center()); |
| painter.drawPath(pendingPath); |
| |
| pendingPath = QPainterPath(); |
| #ifndef QT_NO_CURSOR |
| unsetCursor(); |
| #endif |
| update(); |
| } else { |
| if (brushInterface) { |
| QPainter painter(&theImage); |
| setupPainter(painter); |
| const QRect rect = brushInterface->mousePress(brush, painter, |
| event->pos()); |
| update(rect); |
| } |
| |
| lastPos = event->pos(); |
| } |
| } |
| } |
| |
| //! [1] |
| void PaintArea::mouseMoveEvent(QMouseEvent *event) |
| { |
| if ((event->buttons() & Qt::LeftButton) && lastPos != QPoint(-1, -1)) { |
| if (brushInterface) { |
| QPainter painter(&theImage); |
| setupPainter(painter); |
| const QRect rect = brushInterface->mouseMove(brush, painter, lastPos, |
| event->pos()); |
| update(rect); |
| } |
| |
| lastPos = event->pos(); |
| } |
| } |
| //! [1] |
| |
| void PaintArea::mouseReleaseEvent(QMouseEvent *event) |
| { |
| if (event->button() == Qt::LeftButton && lastPos != QPoint(-1, -1)) { |
| if (brushInterface) { |
| QPainter painter(&theImage); |
| setupPainter(painter); |
| QRect rect = brushInterface->mouseRelease(brush, painter, |
| event->pos()); |
| update(rect); |
| } |
| |
| lastPos = QPoint(-1, -1); |
| } |
| } |
| |
| void PaintArea::setupPainter(QPainter &painter) |
| { |
| painter.setRenderHint(QPainter::Antialiasing, true); |
| painter.setPen(QPen(color, thickness, Qt::SolidLine, Qt::RoundCap, |
| Qt::RoundJoin)); |
| } |