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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#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]
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