Render Area
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#ifndef RENDERAREA_H
#define RENDERAREA_H
#include <QPainterPath>
#include <QWidget>
class RenderArea : public QWidget
{
Q_OBJECT
public:
RenderArea(const QPainterPath &path, QWidget *parent = 0);
QSize minimumSizeHint() const;
QSize sizeHint() const;
public slots:
void setFillRule(Qt::FillRule rule);
void setFillGradient(const QColor &color1, const QColor &color2);
void setPenWidth(int width);
void setPenColor(const QColor &color);
void setRotationAngle(int degrees);
protected:
void paintEvent(QPaintEvent *event);
private:
QPainterPath path;
QColor fillColor1;
QColor fillColor2;
int penWidth;
QColor penColor;
int rotationAngle;
};
#endif
#include <QtGui>
#include "renderarea.h"
RenderArea::RenderArea(const QPainterPath &path, QWidget *parent)
: QWidget(parent), path(path)
{
penWidth = 1;
rotationAngle = 0;
setBackgroundRole(QPalette::Base);
}
QSize RenderArea::minimumSizeHint() const
{
return QSize(50, 50);
}
QSize RenderArea::sizeHint() const
{
return QSize(100, 100);
}
void RenderArea::setFillRule(Qt::FillRule rule)
{
path.setFillRule(rule);
update();
}
void RenderArea::setFillGradient(const QColor &color1, const QColor &color2)
{
fillColor1 = color1;
fillColor2 = color2;
update();
}
void RenderArea::setPenWidth(int width)
{
penWidth = width;
update();
}
void RenderArea::setPenColor(const QColor &color)
{
penColor = color;
update();
}
void RenderArea::setRotationAngle(int degrees)
{
rotationAngle = degrees;
update();
}
void RenderArea::paintEvent(QPaintEvent *)
{
QPainter painter(this);
painter.setRenderHint(QPainter::Antialiasing);
painter.scale(width() / 100.0, height() / 100.0);
painter.translate(50.0, 50.0);
painter.rotate(-rotationAngle);
painter.translate(-50.0, -50.0);
painter.setPen(QPen(penColor, penWidth, Qt::SolidLine, Qt::RoundCap,
Qt::RoundJoin));
QLinearGradient gradient(0, 0, 0, 100);
gradient.setColorAt(0.0, fillColor1);
gradient.setColorAt(1.0, fillColor2);
painter.setBrush(gradient);
painter.drawPath(path);
}
#ifndef WINDOW_H
#define WINDOW_H
#include <QWidget>
QT_BEGIN_NAMESPACE
class QComboBox;
class QLabel;
class QSpinBox;
QT_END_NAMESPACE
class RenderArea;
class Window : public QWidget
{
Q_OBJECT
public:
Window();
private slots:
void fillRuleChanged();
void fillGradientChanged();
void penColorChanged();
private:
void populateWithColors(QComboBox *comboBox);
QVariant currentItemData(QComboBox *comboBox);
enum { NumRenderAreas = 9 };
RenderArea *renderAreas[NumRenderAreas];
QLabel *fillRuleLabel;
QLabel *fillGradientLabel;
QLabel *fillToLabel;
QLabel *penWidthLabel;
QLabel *penColorLabel;
QLabel *rotationAngleLabel;
QComboBox *fillRuleComboBox;
QComboBox *fillColor1ComboBox;
QComboBox *fillColor2ComboBox;
QSpinBox *penWidthSpinBox;
QComboBox *penColorComboBox;
QSpinBox *rotationAngleSpinBox;
};
#endif
#include <QtGui>
#include <math.h>
#include "renderarea.h"
#include "window.h"
const float Pi = 3.14159f;
Window::Window()
{
QPainterPath rectPath;
rectPath.moveTo(20.0, 30.0);
rectPath.lineTo(80.0, 30.0);
rectPath.lineTo(80.0, 70.0);
rectPath.lineTo(20.0, 70.0);
rectPath.closeSubpath();
QPainterPath roundRectPath;
roundRectPath.moveTo(80.0, 35.0);
roundRectPath.arcTo(70.0, 30.0, 10.0, 10.0, 0.0, 90.0);
roundRectPath.lineTo(25.0, 30.0);
roundRectPath.arcTo(20.0, 30.0, 10.0, 10.0, 90.0, 90.0);
roundRectPath.lineTo(20.0, 65.0);
roundRectPath.arcTo(20.0, 60.0, 10.0, 10.0, 180.0, 90.0);
roundRectPath.lineTo(75.0, 70.0);
roundRectPath.arcTo(70.0, 60.0, 10.0, 10.0, 270.0, 90.0);
roundRectPath.closeSubpath();
QPainterPath ellipsePath;
ellipsePath.moveTo(80.0, 50.0);
ellipsePath.arcTo(20.0, 30.0, 60.0, 40.0, 0.0, 360.0);
QPainterPath piePath;
piePath.moveTo(50.0, 50.0);
piePath.arcTo(20.0, 30.0, 60.0, 40.0, 60.0, 240.0);
piePath.closeSubpath();
QPainterPath polygonPath;
polygonPath.moveTo(10.0, 80.0);
polygonPath.lineTo(20.0, 10.0);
polygonPath.lineTo(80.0, 30.0);
polygonPath.lineTo(90.0, 70.0);
polygonPath.closeSubpath();
QPainterPath groupPath;
groupPath.moveTo(60.0, 40.0);
groupPath.arcTo(20.0, 20.0, 40.0, 40.0, 0.0, 360.0);
groupPath.moveTo(40.0, 40.0);
groupPath.lineTo(40.0, 80.0);
groupPath.lineTo(80.0, 80.0);
groupPath.lineTo(80.0, 40.0);
groupPath.closeSubpath();
QPainterPath textPath;
QFont timesFont("Times", 50);
timesFont.setStyleStrategy(QFont::ForceOutline);
textPath.addText(10, 70, timesFont, tr("Qt"));
QPainterPath bezierPath;
bezierPath.moveTo(20, 30);
bezierPath.cubicTo(80, 0, 50, 50, 80, 80);
QPainterPath starPath;
starPath.moveTo(90, 50);
for (int i = 1; i < 5; ++i) {
starPath.lineTo(50 + 40 * cos(0.8 * i * Pi),
50 + 40 * sin(0.8 * i * Pi));
}
starPath.closeSubpath();
renderAreas[0] = new RenderArea(rectPath);
renderAreas[1] = new RenderArea(roundRectPath);
renderAreas[2] = new RenderArea(ellipsePath);
renderAreas[3] = new RenderArea(piePath);
renderAreas[4] = new RenderArea(polygonPath);
renderAreas[5] = new RenderArea(groupPath);
renderAreas[6] = new RenderArea(textPath);
renderAreas[7] = new RenderArea(bezierPath);
renderAreas[8] = new RenderArea(starPath);
Q_ASSERT(NumRenderAreas == 9);
fillRuleComboBox = new QComboBox;
fillRuleComboBox->addItem(tr("Odd Even"), Qt::OddEvenFill);
fillRuleComboBox->addItem(tr("Winding"), Qt::WindingFill);
fillRuleLabel = new QLabel(tr("Fill &Rule:"));
fillRuleLabel->setBuddy(fillRuleComboBox);
fillColor1ComboBox = new QComboBox;
populateWithColors(fillColor1ComboBox);
fillColor1ComboBox->setCurrentIndex(
fillColor1ComboBox->findText("mediumslateblue"));
fillColor2ComboBox = new QComboBox;
populateWithColors(fillColor2ComboBox);
fillColor2ComboBox->setCurrentIndex(
fillColor2ComboBox->findText("cornsilk"));
fillGradientLabel = new QLabel(tr("&Fill Gradient:"));
fillGradientLabel->setBuddy(fillColor1ComboBox);
fillToLabel = new QLabel(tr("to"));
fillToLabel->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
penWidthSpinBox = new QSpinBox;
penWidthSpinBox->setRange(0, 20);
penWidthLabel = new QLabel(tr("&Pen Width:"));
penWidthLabel->setBuddy(penWidthSpinBox);
penColorComboBox = new QComboBox;
populateWithColors(penColorComboBox);
penColorComboBox->setCurrentIndex(
penColorComboBox->findText("darkslateblue"));
penColorLabel = new QLabel(tr("Pen &Color:"));
penColorLabel->setBuddy(penColorComboBox);
rotationAngleSpinBox = new QSpinBox;
rotationAngleSpinBox->setRange(0, 359);
rotationAngleSpinBox->setWrapping(true);
rotationAngleSpinBox->setSuffix("\xB0");
rotationAngleLabel = new QLabel(tr("&Rotation Angle:"));
rotationAngleLabel->setBuddy(rotationAngleSpinBox);
connect(fillRuleComboBox, SIGNAL(activated(int)),
this, SLOT(fillRuleChanged()));
connect(fillColor1ComboBox, SIGNAL(activated(int)),
this, SLOT(fillGradientChanged()));
connect(fillColor2ComboBox, SIGNAL(activated(int)),
this, SLOT(fillGradientChanged()));
connect(penColorComboBox, SIGNAL(activated(int)),
this, SLOT(penColorChanged()));
for (int i = 0; i < NumRenderAreas; ++i) {
connect(penWidthSpinBox, SIGNAL(valueChanged(int)),
renderAreas[i], SLOT(setPenWidth(int)));
connect(rotationAngleSpinBox, SIGNAL(valueChanged(int)),
renderAreas[i], SLOT(setRotationAngle(int)));
}
QGridLayout *topLayout = new QGridLayout;
for (int i = 0; i < NumRenderAreas; ++i)
topLayout->addWidget(renderAreas[i], i / 3, i % 3);
QGridLayout *mainLayout = new QGridLayout;
mainLayout->addLayout(topLayout, 0, 0, 1, 4);
mainLayout->addWidget(fillRuleLabel, 1, 0);
mainLayout->addWidget(fillRuleComboBox, 1, 1, 1, 3);
mainLayout->addWidget(fillGradientLabel, 2, 0);
mainLayout->addWidget(fillColor1ComboBox, 2, 1);
mainLayout->addWidget(fillToLabel, 2, 2);
mainLayout->addWidget(fillColor2ComboBox, 2, 3);
mainLayout->addWidget(penWidthLabel, 3, 0);
mainLayout->addWidget(penWidthSpinBox, 3, 1, 1, 3);
mainLayout->addWidget(penColorLabel, 4, 0);
mainLayout->addWidget(penColorComboBox, 4, 1, 1, 3);
mainLayout->addWidget(rotationAngleLabel, 5, 0);
mainLayout->addWidget(rotationAngleSpinBox, 5, 1, 1, 3);
setLayout(mainLayout);
fillRuleChanged();
fillGradientChanged();
penColorChanged();
penWidthSpinBox->setValue(2);
setWindowTitle(tr("Painter Paths"));
}
void Window::fillRuleChanged()
{
Qt::FillRule rule = (Qt::FillRule)currentItemData(fillRuleComboBox).toInt();
for (int i = 0; i < NumRenderAreas; ++i)
renderAreas[i]->setFillRule(rule);
}
void Window::fillGradientChanged()
{
QColor color1 = qvariant_cast<QColor>(currentItemData(fillColor1ComboBox));
QColor color2 = qvariant_cast<QColor>(currentItemData(fillColor2ComboBox));
for (int i = 0; i < NumRenderAreas; ++i)
renderAreas[i]->setFillGradient(color1, color2);
}
void Window::penColorChanged()
{
QColor color = qvariant_cast<QColor>(currentItemData(penColorComboBox));
for (int i = 0; i < NumRenderAreas; ++i)
renderAreas[i]->setPenColor(color);
}
void Window::populateWithColors(QComboBox *comboBox)
{
QStringList colorNames = QColor::colorNames();
foreach (QString name, colorNames)
comboBox->addItem(name, QColor(name));
}
QVariant Window::currentItemData(QComboBox *comboBox)
{
return comboBox->itemData(comboBox->currentIndex());
}
#include <QApplication>
#include "window.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Window window;
window.show();
return app.exec();
}
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