pathdeform.cpp

qt类库是非微软类库

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#include "pathdeform.h"

#include <QApplication>
#include <QtDebug>
#include <QMouseEvent>
#include <QTimerEvent>
#include <QLayout>
#include <QLineEdit>
#include <QPainter>
#include <QSlider>

#include <math.h>


PathDeformWidget::PathDeformWidget(QWidget *parent)
    : QWidget(parent)
{
    setWindowTitle("Vector Deformation");

    m_renderer = new PathDeformRenderer(this);
    m_renderer->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);

    QGroupBox *mainGroup = new QGroupBox(this);
    mainGroup->setTitle("Vector Deformation");

    QGroupBox *radiusGroup = new QGroupBox(mainGroup);
    radiusGroup->setAttribute(Qt::WA_ContentsPropagated);
    radiusGroup->setTitle("Lens Radius");
    QSlider *radiusSlider = new QSlider(Qt::Horizontal, radiusGroup);
    radiusSlider->setRange(50, 150);
    radiusSlider->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);

    QGroupBox *deformGroup = new QGroupBox(mainGroup);
    deformGroup->setAttribute(Qt::WA_ContentsPropagated);
    deformGroup->setTitle("Deformation");
    QSlider *deformSlider = new QSlider(Qt::Horizontal, deformGroup);
    deformSlider->setRange(-100, 100);
    deformSlider->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);

    QGroupBox *fontSizeGroup = new QGroupBox(mainGroup);
    fontSizeGroup->setAttribute(Qt::WA_ContentsPropagated);
    fontSizeGroup->setTitle("Font Size");
    QSlider *fontSizeSlider = new QSlider(Qt::Horizontal, fontSizeGroup);
    fontSizeSlider->setRange(16, 200);
    fontSizeSlider->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);

    QGroupBox *textGroup = new QGroupBox(mainGroup);
    textGroup->setAttribute(Qt::WA_ContentsPropagated);
    textGroup->setTitle("Text");
    QLineEdit *textInput = new QLineEdit(textGroup);

    QPushButton *animateButton = new QPushButton(mainGroup);
    animateButton->setText("Animated");
    animateButton->setCheckable(true);

    QPushButton *showSourceButton = new QPushButton(mainGroup);
    showSourceButton->setText("Show Source");
//     showSourceButton->setCheckable(true);
#ifdef QT_OPENGL_SUPPORT
    QPushButton *enableOpenGLButton = new QPushButton(mainGroup);
    enableOpenGLButton->setText("Use OpenGL");
    enableOpenGLButton->setCheckable(true);
    enableOpenGLButton->setChecked(m_renderer->usesOpenGL());
    if (!QGLFormat::hasOpenGL())
        enableOpenGLButton->hide();
#endif
    QPushButton *whatsThisButton = new QPushButton(mainGroup);
    whatsThisButton->setText("What's This?");
    whatsThisButton->setCheckable(true);

    // Layouts
    QHBoxLayout *mainLayout = new QHBoxLayout(this);
    mainLayout->addWidget(m_renderer);
    mainLayout->addWidget(mainGroup);
    mainGroup->setFixedWidth(180);

    QVBoxLayout *mainGroupLayout = new QVBoxLayout(mainGroup);
    mainGroupLayout->addWidget(radiusGroup);
    mainGroupLayout->addWidget(deformGroup);
    mainGroupLayout->addWidget(fontSizeGroup);
    mainGroupLayout->addWidget(textGroup);
    mainGroupLayout->addWidget(animateButton);
    mainGroupLayout->addStretch(1);
    mainGroupLayout->addWidget(showSourceButton);
#ifdef QT_OPENGL_SUPPORT
    mainGroupLayout->addWidget(enableOpenGLButton);
#endif
    mainGroupLayout->addWidget(whatsThisButton);

    QVBoxLayout *radiusGroupLayout = new QVBoxLayout(radiusGroup);
    radiusGroupLayout->addWidget(radiusSlider);

    QVBoxLayout *deformGroupLayout = new QVBoxLayout(deformGroup);
    deformGroupLayout->addWidget(deformSlider);

    QVBoxLayout *fontSizeGroupLayout = new QVBoxLayout(fontSizeGroup);
    fontSizeGroupLayout->addWidget(fontSizeSlider);

    QVBoxLayout *textGroupLayout = new QVBoxLayout(textGroup);
    textGroupLayout->addWidget(textInput);

    connect(textInput, SIGNAL(textChanged(QString)), m_renderer, SLOT(setText(QString)));
    connect(radiusSlider, SIGNAL(valueChanged(int)), m_renderer, SLOT(setRadius(int)));
    connect(deformSlider, SIGNAL(valueChanged(int)), m_renderer, SLOT(setIntensity(int)));
    connect(fontSizeSlider, SIGNAL(valueChanged(int)), m_renderer, SLOT(setFontSize(int)));
    connect(animateButton, SIGNAL(clicked(bool)), m_renderer, SLOT(setAnimated(bool)));
    connect(whatsThisButton, SIGNAL(clicked(bool)), m_renderer, SLOT(setDescriptionEnabled(bool)));
    connect(showSourceButton, SIGNAL(clicked()), m_renderer, SLOT(showSource()));
#ifdef QT_OPENGL_SUPPORT
    connect(enableOpenGLButton, SIGNAL(clicked(bool)), m_renderer, SLOT(enableOpenGL(bool)));
#endif
    connect(m_renderer, SIGNAL(descriptionEnabledChanged(bool)),
            whatsThisButton, SLOT(setChecked(bool)));

    animateButton->animateClick();
    deformSlider->setValue(80);
    radiusSlider->setValue(100);
    fontSizeSlider->setValue(120);
    textInput->setText("Qt");

    m_renderer->loadSourceFile(":res/pathdeform.cpp");
    m_renderer->loadDescription(":res/pathdeform.html");
    m_renderer->setDescriptionEnabled(false);
}


static inline QRect circle_bounds(const QPointF &center, double radius, double compensation)
{
    return QRect(qRound(center.x() - radius - compensation),
                 qRound(center.y() - radius - compensation),
                 qRound((radius + compensation) * 2),
                 qRound((radius + compensation) * 2));

}

const int LENS_EXTENT = 10;

PathDeformRenderer::PathDeformRenderer(QWidget *widget)
    : ArthurFrame(widget)
{
    m_radius = 100;
    m_pos = QPointF(m_radius, m_radius);
    m_direction = QPointF(1, 1);
    m_fontSize = 24;
    m_animated = true;
    m_repaintTimer.start(25, this);
    m_repaintTracker.start();
    m_intensity = 100;

//     m_fpsTimer.start(1000, this);
//     m_fpsCounter = 0;

    generateLensPixmap();
}

void PathDeformRenderer::setText(const QString &text)
{
    m_text = text;

    QFont f("times new roman,utopia");
    f.setStyleStrategy(QFont::ForceOutline);
    f.setPointSize(m_fontSize);
    f.setStyleHint(QFont::Times);

    QFontMetrics fm(f);

    m_paths.clear();
    m_pathBounds = QRect();

    QPointF advance(0, 0);

    bool do_quick = true;
    for (int i=0; i<text.size(); ++i) {
        if (text.at(i).unicode() >= 0x4ff && text.at(i).unicode() <= 0x1e00) {
            do_quick = false;
            break;
        }
    }

    if (do_quick) {
        for (int i=0; i<text.size(); ++i) {
            QPainterPath path;
            path.addText(advance, f, text.mid(i, 1));
            m_pathBounds |= path.boundingRect();
            m_paths << path;
            advance += QPointF(fm.width(text.mid(i, 1)), 0);
        }
    } else {
        QPainterPath path;
        path.addText(advance, f, text);
        m_pathBounds |= path.boundingRect();
        m_paths << path;
    }

    for (int i=0; i<m_paths.size(); ++i)
        m_paths[i] = m_paths[i] * QMatrix(1, 0, 0, 1, -m_pathBounds.x(), -m_pathBounds.y());

    update();
}


void PathDeformRenderer::generateLensPixmap()
{
    double rad = m_radius + LENS_EXTENT;

    QRect bounds = circle_bounds(QPointF(), rad, 0);

    QPainter painter;