source: trunk/demos/affine/xform.cpp@ 224

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#include "xform.h"
#include "hoverpoints.h"

#include <QLayout>
#include <QPainter>
#include <QPainterPath>

const int alpha = 155;

XFormView::XFormView(QWidget *parent)
    : ArthurFrame(parent)
{
    setAttribute(Qt::WA_MouseTracking);
    m_type = VectorType;
    m_rotation = 0.0;
    m_scale = 1.0;
    m_shear = 0.0;

    m_pixmap = QPixmap(":res/affine/bg1.jpg");
    pts = new HoverPoints(this, HoverPoints::CircleShape);
    pts->setConnectionType(HoverPoints::LineConnection);
    pts->setEditable(false);
    pts->setPointSize(QSize(15, 15));
    pts->setShapeBrush(QBrush(QColor(151, 0, 0, alpha)));
    pts->setShapePen(QPen(QColor(255, 100, 50, alpha)));
    pts->setConnectionPen(QPen(QColor(151, 0, 0, 50)));
    pts->setBoundingRect(QRectF(0, 0, 500, 500));
    ctrlPoints << QPointF(250, 250) << QPointF(350, 250);
    pts->setPoints(ctrlPoints);
    connect(pts, SIGNAL(pointsChanged(const QPolygonF&)),
            this, SLOT(updateCtrlPoints(const QPolygonF &)));
    setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
}

XFormView::XFormType XFormView::type() const
{
    return m_type;
}

QPixmap XFormView::pixmap() const
{
    return m_pixmap;
}

QString XFormView::text() const
{
    return m_text;
}

void XFormView::setText(const QString &t)
{
    m_text = t;
    update();
}

void XFormView::setPixmap(const QPixmap &p)
{
    m_pixmap = p;
    update();
}

void XFormView::setType(XFormType t)
{
    m_type = t;
    update();
}

void XFormView::mousePressEvent(QMouseEvent *)
{
    setDescriptionEnabled(false);
}

void XFormView::resizeEvent(QResizeEvent *e)
{
    pts->setBoundingRect(rect());
    ArthurFrame::resizeEvent(e);
}

void XFormView::paint(QPainter *p)
{
    p->save();
    p->setRenderHint(QPainter::Antialiasing);
    p->setRenderHint(QPainter::SmoothPixmapTransform);
    switch (m_type) {
    case VectorType:
        drawVectorType(p);
        break;
    case PixmapType:
        drawPixmapType(p);
        break;
    case TextType:
        drawTextType(p);
        break;
    }
    p->restore();
}

void XFormView::updateCtrlPoints(const QPolygonF &points)
{
    QPointF trans = points.at(0) - ctrlPoints.at(0);

    if (qAbs(points.at(0).x() - points.at(1).x()) < 10
        && qAbs(points.at(0).y() - points.at(1).y()) < 10)
        pts->setPoints(ctrlPoints);
    if (!trans.isNull()) {
        ctrlPoints[0] = points.at(0);
        ctrlPoints[1] += trans;
        pts->setPoints(ctrlPoints);
    }
    ctrlPoints = points;

    QLineF line(ctrlPoints.at(0), ctrlPoints.at(1));
    m_rotation = line.angle(QLineF(0, 0, 1, 0));
    if (line.dy() < 0)
        m_rotation = 360 - m_rotation;

    if (trans.isNull())
        emit rotationChanged(int(m_rotation*10));
}

void XFormView::setVectorType()
{
    m_type = VectorType;
    update();
}

void XFormView::setPixmapType()
{
    m_type = PixmapType;
    update();
}

void XFormView::setTextType()
{
    m_type = TextType;
    update();
}

void XFormView::setAnimation(bool animate)
{
    timer.stop();
    if (animate)
        timer.start(25, this);
}

void XFormView::changeRotation(int r)
{
    setRotation(qreal(r) / 10);
}

void XFormView::changeScale(int s)
{
    setScale(qreal(s) / 1000);
}

void XFormView::changeShear(int s)
{
    setShear(qreal(s) / 1000);
}

void XFormView::setShear(qreal s)
{
    m_shear = s;
    update();
}

void XFormView::setScale(qreal s)
{
    m_scale = s;
    update();
}

void XFormView::setRotation(qreal r)
{
    qreal old_rot = m_rotation;
    m_rotation = r;

    QPointF center(pts->points().at(0));
    QMatrix m;
    m.translate(center.x(), center.y());
    m.rotate(m_rotation - old_rot);
    m.translate(-center.x(), -center.y());
    pts->setPoints(pts->points() * m);

    update();
}

void XFormView::timerEvent(QTimerEvent *e)
{
    if (e->timerId() == timer.timerId()) {
        QPointF center(pts->points().at(0));
        QMatrix m;
        m.translate(center.x(), center.y());
        m.rotate(0.2);
        m.translate(-center.x(), -center.y());
        pts->setPoints(pts->points() * m);

        setUpdatesEnabled(false);
        static qreal scale_inc = 0.003;
        static qreal shear_inc = -0.001;
        emit scaleChanged(int((m_scale + scale_inc) * 1000));
        emit shearChanged(int((m_shear + shear_inc) * 1000));
        if (m_scale >= 4.0 || m_scale <= 0.1)
            scale_inc = -scale_inc;
        if (m_shear >= 1.0 || m_shear <= -1.0)
            shear_inc = -shear_inc;
        setUpdatesEnabled(true);

        pts->firePointChange();
    }
}

void XFormView::wheelEvent(QWheelEvent *e)
{
    m_scale += e->delta() / qreal(600);
    m_scale = qMax(qreal(0.1), qMin(qreal(4), m_scale));
    emit scaleChanged(int(m_scale*1000));
}

void XFormView::reset()
{
    emit rotationChanged(0);
    emit scaleChanged(1000);
    emit shearChanged(0);
    ctrlPoints = QPolygonF();
    ctrlPoints << QPointF(250, 250) << QPointF(350, 250);
    pts->setPoints(ctrlPoints);
    pts->firePointChange();
}

void XFormView::drawPixmapType(QPainter *painter)
{
    QPointF center(m_pixmap.width() / qreal(2), m_pixmap.height() / qreal(2));
    painter->translate(ctrlPoints.at(0) - center);

    painter->translate(center);
    painter->rotate(m_rotation);
    painter->scale(m_scale, m_scale);
    painter->shear(0, m_shear);
    painter->translate(-center);

    painter->drawPixmap(QPointF(0, 0), m_pixmap);
    painter->setPen(QPen(QColor(255, 0, 0, alpha), 0.25, Qt::SolidLine, Qt::FlatCap, Qt::BevelJoin));
    painter->setBrush(Qt::NoBrush);
    painter->drawRect(QRectF(0, 0, m_pixmap.width(), m_pixmap.height()).adjusted(-2, -2, 2, 2));
}

void XFormView::drawTextType(QPainter *painter)
{
    QPainterPath path;
    QFont f("times new roman,utopia");
    f.setStyleStrategy(QFont::ForceOutline);
    f.setPointSize(72);
    f.setStyleHint(QFont::Times);
    path.addText(0, 0, f, m_text);

    QFontMetrics fm(f);
    QRectF br(fm.boundingRect(m_text));
    QPointF center(br.center());
    painter->translate(ctrlPoints.at(0) - center);

    painter->translate(center);
    painter->rotate(m_rotation);
    painter->scale(m_scale, m_scale);
    painter->shear(0, m_shear);
    painter->translate(-center);

    painter->fillPath(path, Qt::black);

    painter->setPen(QPen(QColor(255, 0, 0, alpha), 0.25, Qt::SolidLine, Qt::FlatCap, Qt::BevelJoin));
    painter->setBrush(Qt::NoBrush);
    painter->drawRect(br.adjusted(-1, -1, 1, 1));
}

void XFormView::drawVectorType(QPainter *painter)
{
    QPainterPath path;
    painter->translate(ctrlPoints.at(0) - QPointF(250,250));

    painter->scale(0.77, 0.77);