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| |
| #include "renderarea.h" |
| |
| #include <QPainter> |
| #include <QPaintEvent> |
| |
| //! [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] |