diff options
Diffstat (limited to 'src/gui/doc/snippets/code/src_gui_painting_qpainter.cpp')
| -rw-r--r-- | src/gui/doc/snippets/code/src_gui_painting_qpainter.cpp | 213 |
1 files changed, 150 insertions, 63 deletions
diff --git a/src/gui/doc/snippets/code/src_gui_painting_qpainter.cpp b/src/gui/doc/snippets/code/src_gui_painting_qpainter.cpp index 37fae52778..cfbf3e44a2 100644 --- a/src/gui/doc/snippets/code/src_gui_painting_qpainter.cpp +++ b/src/gui/doc/snippets/code/src_gui_painting_qpainter.cpp @@ -1,52 +1,25 @@ -/**************************************************************************** -** -** Copyright (C) 2016 The Qt Company Ltd. -** Contact: https://www.qt.io/licensing/ -** -** This file is part of the documentation of the Qt Toolkit. -** -** $QT_BEGIN_LICENSE:BSD$ -** Commercial License Usage -** Licensees holding valid commercial Qt licenses may use this file in -** accordance with the commercial license agreement provided with the -** Software or, alternatively, in accordance with the terms contained in -** a written agreement between you and The Qt Company. For licensing terms -** and conditions see https://www.qt.io/terms-conditions. For further -** information use the contact form at https://www.qt.io/contact-us. -** -** BSD License Usage -** Alternatively, you may use this file under the terms of the BSD license -** as follows: -** -** "Redistribution and use in source and binary forms, with or without -** modification, are permitted provided that the following conditions are -** met: -** * Redistributions of source code must retain the above copyright -** notice, this list of conditions and the following disclaimer. -** * Redistributions in binary form must reproduce the above copyright -** notice, this list of conditions and the following disclaimer in -** the documentation and/or other materials provided with the -** distribution. -** * Neither the name of The Qt Company Ltd nor the names of its -** contributors may be used to endorse or promote products derived -** from this software without specific prior written permission. -** -** -** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT -** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT -** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE -** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." -** -** $QT_END_LICENSE$ -** -****************************************************************************/ +// Copyright (C) 2016 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause +#include <QOpenGLFunctions> +#include <QPaintEvent> +#include <QPainter> +#include <QPainterPath> +#include <QPicture> +#include <QRectF> +#include <QWidget> + + +namespace src_gui_painting_qpainter { +struct SimpleExampleWidget : public QPaintDevice { + void paintEvent(QPaintEvent *); + QRect rect(); +}; +struct MyWidget : public QWidget +{ + void paintEvent(QPaintEvent *); +}; +QLine drawingCode; + //! [0] void SimpleExampleWidget::paintEvent(QPaintEvent *) @@ -64,21 +37,49 @@ void MyWidget::paintEvent(QPaintEvent *) { QPainter p; p.begin(this); - p.drawLine(...); // drawing code + p.drawLine(drawingCode); // drawing code p.end(); } //! [1] +} // src_gui_painting_qpainter +namespace src_gui_painting_qpainter2 { +struct MyWidget : public QWidget +{ + void paintEvent(QPaintEvent *); + int background() { return 0; } + void wrapper1(); + void wrapper2(); + void wrapper3(); + void wrapper4(); + void wrapper5(); + void wrapper6(); + void wrapper7(); + void wrapper8(); + void wrapper9(); + void wrapper10(); + void wrapper11(); + void wrapper12(); + void wrapper13(); + void wrapper14(); + void wrapper15(); + void concentricCircles(); +}; +QLine drawingCode; //! [2] void MyWidget::paintEvent(QPaintEvent *) { QPainter p(this); - p.drawLine(...); // drawing code + p.drawLine(drawingCode); // drawing code } //! [2] +void wrapper0() { +QPainter *painter = nullptr; +QPainter *painter2 = nullptr; +QPaintDevice *myWidget = nullptr; //! [3] painter->begin(0); // impossible - paint device cannot be 0 @@ -89,17 +90,17 @@ painter->begin(myWidget); painter2->begin(myWidget); // impossible - only one painter at a time //! [3] +} // wrapper0 -//! [4] -void QPainter::rotate(qreal angle) -{ - QMatrix matrix; - matrix.rotate(angle); - setWorldMatrix(matrix, true); -} -//! [4] +namespace QPainterWrapper { +struct QPainter { + void rotate(qreal angle); + void setWorldTransform(QTransform matrix, bool); +}; +} // QPainterWrapper +void MyWidget::wrapper1() { //! [5] QPainterPath path; path.moveTo(20, 80); @@ -114,10 +115,13 @@ painter.drawPath(path); //! [6] QLineF line(10.0, 80.0, 90.0, 20.0); -QPainter(this); +QPainter painter(this); painter.drawLine(line); //! [6] +} // MyWidget::wrapper1() + +void MyWidget::wrapper2() { //! [7] QRectF rectangle(10.0, 20.0, 80.0, 60.0); @@ -126,6 +130,10 @@ QPainter painter(this); painter.drawRect(rectangle); //! [7] +} // MyWidget::wrapper2 + + +void MyWidget::wrapper3() { //! [8] QRectF rectangle(10.0, 20.0, 80.0, 60.0); @@ -134,6 +142,10 @@ QPainter painter(this); painter.drawRoundedRect(rectangle, 20.0, 15.0); //! [8] +} // MyWidget::wrapper3 + + +void MyWidget::wrapper4() { //! [9] QRectF rectangle(10.0, 20.0, 80.0, 60.0); @@ -142,6 +154,10 @@ QPainter painter(this); painter.drawEllipse(rectangle); //! [9] +} // MyWidget::wrapper4 + + +void MyWidget::wrapper5() { //! [10] QRectF rectangle(10.0, 20.0, 80.0, 60.0); @@ -152,6 +168,10 @@ QPainter painter(this); painter.drawArc(rectangle, startAngle, spanAngle); //! [10] +} // MyWidget::wrapper5 + + +void MyWidget::wrapper6() { //! [11] QRectF rectangle(10.0, 20.0, 80.0, 60.0); @@ -162,6 +182,11 @@ QPainter painter(this); painter.drawPie(rectangle, startAngle, spanAngle); //! [11] +} // MyWidget::wrapper6 + + +void MyWidget::wrapper7() { +QRect rect; //! [12] QRectF rectangle(10.0, 20.0, 80.0, 60.0); @@ -171,7 +196,11 @@ int spanAngle = 120 * 16; QPainter painter(this); painter.drawChord(rect, startAngle, spanAngle); //! [12] +Q_UNUSED(rectangle); +} // MyWidget::wrapper7 + +void MyWidget::wrapper8() { //! [13] static const QPointF points[3] = { @@ -184,7 +213,10 @@ QPainter painter(this); painter.drawPolyline(points, 3); //! [13] +} // MyWidget::wrapper8 + +void MyWidget::wrapper9() { //! [14] static const QPointF points[4] = { QPointF(10.0, 80.0), @@ -197,6 +229,10 @@ QPainter painter(this); painter.drawPolygon(points, 4); //! [14] +} // MyWidget::wrapper9 + + +void MyWidget::wrapper10() { //! [15] static const QPointF points[4] = { @@ -216,31 +252,52 @@ QRectF target(10.0, 20.0, 80.0, 60.0); QRectF source(0.0, 0.0, 70.0, 40.0); QPixmap pixmap(":myPixmap.png"); -QPainter(this); +QPainter painter(this); painter.drawPixmap(target, pixmap, source); //! [16] +} // MyWidget::wrapper10 + + +void MyWidget::wrapper11() { +QRect rect; //! [17] QPainter painter(this); painter.drawText(rect, Qt::AlignCenter, tr("Qt\nProject")); //! [17] +} // MyWidget::wrapper11 + + +QRectF fillRect(QRect rect, int background) { + Q_UNUSED(rect); + Q_UNUSED(background); + return QRectF(); +}; +void MyWidget::wrapper12() { +QRect rectangle; //! [18] QPicture picture; -QPointF point(10.0, 20.0) +QPointF point(10.0, 20.0); picture.load("drawing.pic"); QPainter painter(this); painter.drawPicture(0, 0, picture); //! [18] +Q_UNUSED(point); + //! [19] -fillRect(rectangle, background()). +fillRect(rectangle, background()); //! [19] +} // MyWidget::wrapper12 + + +void MyWidget::wrapper13() { //! [20] QRectF target(10.0, 20.0, 80.0, 60.0); @@ -251,6 +308,10 @@ QPainter painter(this); painter.drawImage(target, image, source); //! [20] +} // MyWidget::wrapper13 + + +void MyWidget::wrapper14() { //! [21] QPainter painter(this); @@ -268,6 +329,11 @@ glDisable(GL_SCISSOR_TEST); painter.endNativePainting(); //! [21] +} // MyWidget::wrapper14 + + +void MyWidget::wrapper15() { + //! [drawText] QPainter painter(this); QFont font = painter.font(); @@ -287,3 +353,24 @@ pen.setStyle(Qt::DashLine); painter.setPen(pen); painter.drawRect(rectangle.adjusted(0, 0, -pen.width(), -pen.width())); //! [drawText] + + +} // MyWidget::wrapper15 + +void MyWidget::concentricCircles() +{ +//! [renderHint] + QPainter painter(this); + painter.setRenderHint(QPainter::Antialiasing, true); +//! [renderHint] + int diameter = 50; +//! [floatBased] + painter.drawEllipse(QRectF(-diameter / 2.0, -diameter / 2.0, diameter, diameter)); +//! [floatBased] +//! [intBased] + painter.drawEllipse(QRect(-diameter / 2, -diameter / 2, diameter, diameter)); +//! [intBased] + +} // MyWidget::concentricCircles + +} // src_gui_painting_qpainter2
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