C++/Qt/QBrush

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Basic drawing

  
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef RENDERAREA_H
#define RENDERAREA_H
#include <QBrush>
#include <QPen>
#include <QPixmap>
#include <QWidget>

class RenderArea : public QWidget
{
    Q_OBJECT
public:
    enum Shape { Line, Points, Polyline, Polygon, Rect, RoundedRect, Ellipse, Arc,
                 Chord, Pie, Path, Text, Pixmap };
    RenderArea(QWidget *parent = 0);
    QSize minimumSizeHint() const;
    QSize sizeHint() const;
public slots:
    void setShape(Shape shape);
    void setPen(const QPen &pen);
    void setBrush(const QBrush &brush);
    void setAntialiased(bool antialiased);
    void setTransformed(bool transformed);
protected:
    void paintEvent(QPaintEvent *event);
private:
    Shape shape;
    QPen pen;
    QBrush brush;
    bool antialiased;
    bool transformed;
    QPixmap pixmap;
};

#endif


#include <QtGui>
#include "renderarea.h"

RenderArea::RenderArea(QWidget *parent)
    : QWidget(parent)
{
    shape = Polygon;
    antialiased = false;
    transformed = false;
    pixmap.load(":/images/qt-logo.png");
    setBackgroundRole(QPalette::Base);
    setAutoFillBackground(true);
}

QSize RenderArea::minimumSizeHint() const
{
    return QSize(100, 100);
}

QSize RenderArea::sizeHint() const
{
    return QSize(400, 200);
}

void RenderArea::setShape(Shape shape)
{
    this->shape = shape;
    update();
}

void RenderArea::setPen(const QPen &pen)
{
    this->pen = pen;
    update();
}

void RenderArea::setBrush(const QBrush &brush)
{
    this->brush = brush;
    update();
}

void RenderArea::setAntialiased(bool antialiased)
{
    this->antialiased = antialiased;
    update();
}

void RenderArea::setTransformed(bool transformed)
{
    this->transformed = transformed;
    update();
}

void RenderArea::paintEvent(QPaintEvent * /* event */)
{
    static const QPoint points[4] = {
        QPoint(10, 80),
        QPoint(20, 10),
        QPoint(80, 30),
        QPoint(90, 70)
    };
    QRect rect(10, 20, 80, 60);
    QPainterPath path;
    path.moveTo(20, 80);
    path.lineTo(20, 30);
    path.cubicTo(80, 0, 50, 50, 80, 80);
    int startAngle = 20 * 16;
    int arcLength = 120 * 16;

    QPainter painter(this);
    painter.setPen(pen);
    painter.setBrush(brush);
    if (antialiased) {
        painter.setRenderHint(QPainter::Antialiasing, true);
        painter.translate(+0.5, +0.5);
    }

    for (int x = 0; x < width(); x += 100) {
        for (int y = 0; y < height(); y += 100) {
            painter.save();
            painter.translate(x, y);
 
            if (transformed) {
                painter.translate(50, 50);
                painter.rotate(60.0);
                painter.scale(0.6, 0.9);
                painter.translate(-50, -50);
            }

            switch (shape) {
            case Line:
                painter.drawLine(rect.bottomLeft(), rect.topRight());
                break;
            case Points:
                painter.drawPoints(points, 4);
                break;
            case Polyline:
                painter.drawPolyline(points, 4);
                break;
            case Polygon:
                painter.drawPolygon(points, 4);
                break;
            case Rect:
                painter.drawRect(rect);
                break;
            case RoundedRect:
                painter.drawRoundedRect(rect, 25, 25, Qt::RelativeSize);
                break;
            case Ellipse:
                painter.drawEllipse(rect);
                break;
            case Arc:
                painter.drawArc(rect, startAngle, arcLength);
                break;
            case Chord:
                painter.drawChord(rect, startAngle, arcLength);
                break;
            case Pie:
                painter.drawPie(rect, startAngle, arcLength);
                break;
            case Path:
                painter.drawPath(path);
                break;
            case Text:
                painter.drawText(rect, Qt::AlignCenter, tr("Qt by\nNokia"));
                break;
            case Pixmap:
                painter.drawPixmap(10, 10, pixmap);
            }
 
            painter.restore();
        }
    }
    painter.setPen(palette().dark().color());
    painter.setBrush(Qt::NoBrush);
    painter.drawRect(QRect(0, 0, width() - 1, height() - 1));
}



#ifndef WINDOW_H
#define WINDOW_H
#include <QWidget>
QT_BEGIN_NAMESPACE
class QCheckBox;
class QComboBox;
class QLabel;
class QSpinBox;
QT_END_NAMESPACE
class RenderArea;

class Window : public QWidget
{
    Q_OBJECT
public:
    Window();
private slots:
    void shapeChanged();
    void penChanged();
    void brushChanged();
private:
    RenderArea *renderArea;
    QLabel *shapeLabel;
    QLabel *penWidthLabel;
    QLabel *penStyleLabel;
    QLabel *penCapLabel;
    QLabel *penJoinLabel;
    QLabel *brushStyleLabel;
    QLabel *otherOptionsLabel;
    QComboBox *shapeComboBox;
    QSpinBox *penWidthSpinBox;
    QComboBox *penStyleComboBox;
    QComboBox *penCapComboBox;
    QComboBox *penJoinComboBox;
    QComboBox *brushStyleComboBox;
    QCheckBox *antialiasingCheckBox;
    QCheckBox *transformationsCheckBox;
};

#endif



#include <QtGui>
#include "renderarea.h"
#include "window.h"

const int IdRole = Qt::UserRole;

Window::Window()
{
    renderArea = new RenderArea;
    shapeComboBox = new QComboBox;
    shapeComboBox->addItem(tr("Polygon"), RenderArea::Polygon);
    shapeComboBox->addItem(tr("Rectangle"), RenderArea::Rect);
    shapeComboBox->addItem(tr("Rounded Rectangle"), RenderArea::RoundedRect);
    shapeComboBox->addItem(tr("Ellipse"), RenderArea::Ellipse);
    shapeComboBox->addItem(tr("Pie"), RenderArea::Pie);
    shapeComboBox->addItem(tr("Chord"), RenderArea::Chord);
    shapeComboBox->addItem(tr("Path"), RenderArea::Path);
    shapeComboBox->addItem(tr("Line"), RenderArea::Line);
    shapeComboBox->addItem(tr("Polyline"), RenderArea::Polyline);
    shapeComboBox->addItem(tr("Arc"), RenderArea::Arc);
    shapeComboBox->addItem(tr("Points"), RenderArea::Points);
    shapeComboBox->addItem(tr("Text"), RenderArea::Text);
    shapeComboBox->addItem(tr("Pixmap"), RenderArea::Pixmap);
    shapeLabel = new QLabel(tr("&Shape:"));
    shapeLabel->setBuddy(shapeComboBox);

    penWidthSpinBox = new QSpinBox;
    penWidthSpinBox->setRange(0, 20);
    penWidthSpinBox->setSpecialValueText(tr("0 (cosmetic pen)"));
    penWidthLabel = new QLabel(tr("Pen &Width:"));
    penWidthLabel->setBuddy(penWidthSpinBox);

    penStyleComboBox = new QComboBox;
    penStyleComboBox->addItem(tr("Solid"), Qt::SolidLine);
    penStyleComboBox->addItem(tr("Dash"), Qt::DashLine);
    penStyleComboBox->addItem(tr("Dot"), Qt::DotLine);
    penStyleComboBox->addItem(tr("Dash Dot"), Qt::DashDotLine);
    penStyleComboBox->addItem(tr("Dash Dot Dot"), Qt::DashDotDotLine);
    penStyleComboBox->addItem(tr("None"), Qt::NoPen);
    penStyleLabel = new QLabel(tr("&Pen Style:"));
    penStyleLabel->setBuddy(penStyleComboBox);
    penCapComboBox = new QComboBox;
    penCapComboBox->addItem(tr("Flat"), Qt::FlatCap);
    penCapComboBox->addItem(tr("Square"), Qt::SquareCap);
    penCapComboBox->addItem(tr("Round"), Qt::RoundCap);
    penCapLabel = new QLabel(tr("Pen &Cap:"));
    penCapLabel->setBuddy(penCapComboBox);
    penJoinComboBox = new QComboBox;
    penJoinComboBox->addItem(tr("Miter"), Qt::MiterJoin);
    penJoinComboBox->addItem(tr("Bevel"), Qt::BevelJoin);
    penJoinComboBox->addItem(tr("Round"), Qt::RoundJoin);
    penJoinLabel = new QLabel(tr("Pen &Join:"));
    penJoinLabel->setBuddy(penJoinComboBox);

    brushStyleComboBox = new QComboBox;
    brushStyleComboBox->addItem(tr("Linear Gradient"),
            Qt::LinearGradientPattern);
    brushStyleComboBox->addItem(tr("Radial Gradient"),
            Qt::RadialGradientPattern);
    brushStyleComboBox->addItem(tr("Conical Gradient"),
            Qt::ConicalGradientPattern);
    brushStyleComboBox->addItem(tr("Texture"), Qt::TexturePattern);
    brushStyleComboBox->addItem(tr("Solid"), Qt::SolidPattern);
    brushStyleComboBox->addItem(tr("Horizontal"), Qt::HorPattern);
    brushStyleComboBox->addItem(tr("Vertical"), Qt::VerPattern);
    brushStyleComboBox->addItem(tr("Cross"), Qt::CrossPattern);
    brushStyleComboBox->addItem(tr("Backward Diagonal"), Qt::BDiagPattern);
    brushStyleComboBox->addItem(tr("Forward Diagonal"), Qt::FDiagPattern);
    brushStyleComboBox->addItem(tr("Diagonal Cross"), Qt::DiagCrossPattern);
    brushStyleComboBox->addItem(tr("Dense 1"), Qt::Dense1Pattern);
    brushStyleComboBox->addItem(tr("Dense 2"), Qt::Dense2Pattern);
    brushStyleComboBox->addItem(tr("Dense 3"), Qt::Dense3Pattern);
    brushStyleComboBox->addItem(tr("Dense 4"), Qt::Dense4Pattern);
    brushStyleComboBox->addItem(tr("Dense 5"), Qt::Dense5Pattern);
    brushStyleComboBox->addItem(tr("Dense 6"), Qt::Dense6Pattern);
    brushStyleComboBox->addItem(tr("Dense 7"), Qt::Dense7Pattern);
    brushStyleComboBox->addItem(tr("None"), Qt::NoBrush);
    brushStyleLabel = new QLabel(tr("&Brush Style:"));
    brushStyleLabel->setBuddy(brushStyleComboBox);

    otherOptionsLabel = new QLabel(tr("Other Options:"));
 
    antialiasingCheckBox = new QCheckBox(tr("&Antialiasing"));
 
    transformationsCheckBox = new QCheckBox(tr("&Transformations"));

    connect(shapeComboBox, SIGNAL(activated(int)),
            this, SLOT(shapeChanged()));
    connect(penWidthSpinBox, SIGNAL(valueChanged(int)),
            this, SLOT(penChanged()));
    connect(penStyleComboBox, SIGNAL(activated(int)),
            this, SLOT(penChanged()));
    connect(penCapComboBox, SIGNAL(activated(int)),
            this, SLOT(penChanged()));
    connect(penJoinComboBox, SIGNAL(activated(int)),
            this, SLOT(penChanged()));
    connect(brushStyleComboBox, SIGNAL(activated(int)),
            this, SLOT(brushChanged()));
    connect(antialiasingCheckBox, SIGNAL(toggled(bool)),
            renderArea, SLOT(setAntialiased(bool)));
    connect(transformationsCheckBox, SIGNAL(toggled(bool)),
            renderArea, SLOT(setTransformed(bool)));

    QGridLayout *mainLayout = new QGridLayout;
 
    mainLayout->setColumnStretch(0, 1);
    mainLayout->setColumnStretch(3, 1);
    mainLayout->addWidget(renderArea, 0, 0, 1, 4);
    mainLayout->setRowMinimumHeight(1, 6);
    mainLayout->addWidget(shapeLabel, 2, 1, Qt::AlignRight);
    mainLayout->addWidget(shapeComboBox, 2, 2);
    mainLayout->addWidget(penWidthLabel, 3, 1, Qt::AlignRight);
    mainLayout->addWidget(penWidthSpinBox, 3, 2);
    mainLayout->addWidget(penStyleLabel, 4, 1, Qt::AlignRight);
    mainLayout->addWidget(penStyleComboBox, 4, 2);
    mainLayout->addWidget(penCapLabel, 5, 1, Qt::AlignRight);
    mainLayout->addWidget(penCapComboBox, 5, 2);
    mainLayout->addWidget(penJoinLabel, 6, 1, Qt::AlignRight);
    mainLayout->addWidget(penJoinComboBox, 6, 2);
    mainLayout->addWidget(brushStyleLabel, 7, 1, Qt::AlignRight);
    mainLayout->addWidget(brushStyleComboBox, 7, 2);
    mainLayout->setRowMinimumHeight(8, 6);
    mainLayout->addWidget(otherOptionsLabel, 9, 1, Qt::AlignRight);
    mainLayout->addWidget(antialiasingCheckBox, 9, 2);
    mainLayout->addWidget(transformationsCheckBox, 10, 2);
    setLayout(mainLayout);
    shapeChanged();
    penChanged();
    brushChanged();
    antialiasingCheckBox->setChecked(true);
    setWindowTitle(tr("Basic Drawing"));
}

void Window::shapeChanged()
{
    RenderArea::Shape shape = RenderArea::Shape(shapeComboBox->itemData(
            shapeComboBox->currentIndex(), IdRole).toInt());
    renderArea->setShape(shape);
}

void Window::penChanged()
{
    int width = penWidthSpinBox->value();
    Qt::PenStyle style = Qt::PenStyle(penStyleComboBox->itemData(
            penStyleComboBox->currentIndex(), IdRole).toInt());
    Qt::PenCapStyle cap = Qt::PenCapStyle(penCapComboBox->itemData(
            penCapComboBox->currentIndex(), IdRole).toInt());
    Qt::PenJoinStyle join = Qt::PenJoinStyle(penJoinComboBox->itemData(
            penJoinComboBox->currentIndex(), IdRole).toInt());
    renderArea->setPen(QPen(Qt::blue, width, style, cap, join));
}

void Window::brushChanged()
{
    Qt::BrushStyle style = Qt::BrushStyle(brushStyleComboBox->itemData(
            brushStyleComboBox->currentIndex(), IdRole).toInt());

    if (style == Qt::LinearGradientPattern) {
        QLinearGradient linearGradient(0, 0, 100, 100);
        linearGradient.setColorAt(0.0, Qt::white);
        linearGradient.setColorAt(0.2, Qt::green);
        linearGradient.setColorAt(1.0, Qt::black);
        renderArea->setBrush(linearGradient);
 
    } else if (style == Qt::RadialGradientPattern) {
        QRadialGradient radialGradient(50, 50, 50, 70, 70);
        radialGradient.setColorAt(0.0, Qt::white);
        radialGradient.setColorAt(0.2, Qt::green);
        radialGradient.setColorAt(1.0, Qt::black);
        renderArea->setBrush(radialGradient);
    } else if (style == Qt::ConicalGradientPattern) {
        QConicalGradient conicalGradient(50, 50, 150);
        conicalGradient.setColorAt(0.0, Qt::white);
        conicalGradient.setColorAt(0.2, Qt::green);
        conicalGradient.setColorAt(1.0, Qt::black);
        renderArea->setBrush(conicalGradient);
 
    } else if (style == Qt::TexturePattern) {
        renderArea->setBrush(QBrush(QPixmap(":/images/brick.png")));
 
    } else {
        renderArea->setBrush(QBrush(Qt::green, style));
    }
}


#include <QApplication>
#include "window.h"
int main(int argc, char *argv[])
{
    Q_INIT_RESOURCE(basicdrawing);
    QApplication app(argc, argv);
    Window window;
    window.show();
    return app.exec();
}


Create brush

  
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtGui>
int main(int argv, char **args)
{
    QApplication app(argv, args);
    QRadialGradient gradient(50, 50, 50, 50, 50);
    gradient.setColorAt(0, QColor::fromRgbF(0, 1, 0, 1));
    gradient.setColorAt(1, QColor::fromRgbF(0, 0, 0, 0));
    QBrush brush(gradient);
    QWidget widget;
    QPalette palette;
    palette.setBrush(widget.backgroundRole(), brush);
    widget.setPalette(palette);
    widget.show();
    return app.exec();
}


Paint with QBrush

  
        
#include <QtGui>
int main(int argv, char **args)
{
    QApplication app(argv, args);
    QLinearGradient linearGrad(QPointF(100, 100), QPointF(200, 200));
    linearGrad.setColorAt(0, Qt::black);
    linearGrad.setColorAt(1, Qt::white);
    QBrush brush(linearGrad);
        QPainter painter;
        QPen pen(Qt::red, 2);                 // red solid line, 2 pixels wide
        painter.setPen(pen);              // set the red, wide pen
        painter.drawRect(40,30, 200,100); // draw a rectangle
        painter.setPen(Qt::blue);             // set blue pen, 0 pixel width
        painter.drawLine(40,30, 240,130); // draw a diagonal in rectangle
        painter.end();                    // painting done
    QWidget widget;
    QPalette palette;
    palette.setBrush(widget.backgroundRole(), brush);
    widget.setPalette(palette);
    widget.show();
    return app.exec();
}


Set push button checkable to true

  
#include <QtGui>
int main(int argc, char* argv[])
{
  QApplication app(argc, argv);
  QDialog dlg;
  QPushButton *btn = new QPushButton(QObject::tr("Expand/Collapse"),&dlg);
  btn->setCheckable(true);
  QVBoxLayout *lay = new QVBoxLayout(&dlg);
  lay->addWidget(btn);
  QLabel *ext = new QLabel(QObject::tr("Extension"));
  dlg.setExtension(ext);
  QObject::connect(btn, SIGNAL(toggled(bool)),&dlg, SLOT(showExtension(bool)));
  dlg.exec();
  return app.exec();
}


Using Pen and Brush to draw

  

#include <QtGui>
int main(int argc, char* argv[])
{
  QApplication app(argc, argv);
  QRect r(0,0, 100, 100);
  QPixmap pm(r.size());
  pm.fill();
  QPainter p(&pm);
  p.setRenderHint(QPainter::Antialiasing, true);
  QPen pen(Qt::red, 2);
  p.setPen(pen);
  QBrush brush(Qt::blue);
  p.setBrush(brush);
  QRect ri = r.adjusted(10,10,-10,-10)
  p.drawEllipse(ri);
  QLabel l;
  l.setPixmap(pm);
  l.show();
  return app.exec();
}