context2d.cpp

奇趣公司比较新的qt/emd版本

        pen.setJoinStyle(Qt::MiterJoin);
    m_painter.setPen(pen);
}

void Context2D::setMiterLimit(qreal m)
{
    QPen pen = m_painter.pen();
    pen.setMiterLimit(m);
    m_painter.setPen(pen);
}

qreal Context2D::lineWidth() const
{
    return m_painter.pen().widthF();
}

QString Context2D::lineCap() const
{
    return QString();
}


QString Context2D::lineJoin() const
{
    return QString();
}

qreal Context2D::miterLimit() const
{
    return 0;
}

void Context2D::setShadowOffsetX(qreal x)
{
    Q_UNUSED(x);
}

void Context2D::setShadowOffsetY(qreal y)
{
    Q_UNUSED(y);
}

void Context2D::setShadowBlur(qreal b)
{
    Q_UNUSED(b);
}

void Context2D::setShadowColor(const QColor &c)
{
    Q_UNUSED(c);
}

qreal Context2D::shadowOffsetX() const
{
    return 0;
}

qreal Context2D::shadowOffsetY() const
{
    return 0;
}


qreal Context2D::shadowBlur() const
{
    return 0;
}


QColor Context2D::shadowColor() const
{
    return QColor();
}


void Context2D::clearRect(qreal x, qreal y, qreal w, qreal h)
{
    m_painter.save();
    m_painter.setCompositionMode(QPainter::CompositionMode_Source);
    m_painter.fillRect(QRectF(x, y, w, h), QColor(0, 0, 0, 0));
    m_painter.restore();
}


void Context2D::fillRect(qreal x, qreal y, qreal w, qreal h)
{
    m_painter.fillRect(QRectF(x, y, w, h), m_painter.brush());
}


void Context2D::strokeRect(qreal x, qreal y, qreal w, qreal h)
{
    QPainterPath path; path.addRect(x, y, w, h);
    m_painter.strokePath(path, m_painter.pen());
}


void Context2D::beginPath()
{
    m_path = QPainterPath();
    m_state.creatingShape = true;
}


void Context2D::closePath()
{
    m_path.closeSubpath();
    m_state.creatingShape = false;
}


void Context2D::moveTo(qreal x, qreal y)
{
    QPointF pt = m_state.matrix.map(QPointF(x, y));
    m_path.moveTo(pt);
}


void Context2D::lineTo(qreal x, qreal y)
{
    QPointF pt = m_state.matrix.map(QPointF(x, y));
    m_path.lineTo(pt);
}


void Context2D::quadraticCurveTo(qreal cpx, qreal cpy, qreal x, qreal y)
{
    QPointF cp = m_state.matrix.map(QPointF(cpx, cpy));
    QPointF xy = m_state.matrix.map(QPointF(x, y));
    m_path.quadTo(cp, xy);
}


void Context2D::bezierCurveTo(qreal cp1x, qreal cp1y,
                              qreal cp2x, qreal cp2y, qreal x, qreal y)
{
    QPointF cp1 = m_state.matrix.map(QPointF(cp1x, cp1y));
    QPointF cp2 = m_state.matrix.map(QPointF(cp2x, cp2y));
    QPointF end = m_state.matrix.map(QPointF(x, y));
    m_path.cubicTo(cp1, cp2, end);
}


void Context2D::arcTo(qreal x1, qreal y1, qreal x2, qreal y2, qreal radius)
{
    //FIXME: this is surely busted
    QPointF st  = m_state.matrix.map(QPointF(x1, y1));
    QPointF end = m_state.matrix.map(QPointF(x2, y2));
    m_path.arcTo(st.x(), st.y(),
                 end.x()-st.x(), end.y()-st.y(),
                 radius, 90);
}


void Context2D::rect(qreal x, qreal y, qreal w, qreal h)
{
    QPainterPath path; path.addRect(x, y, w, h);
    path = m_state.matrix.map(path);
    m_path.addPath(path);
}

void Context2D::arc(qreal xc, qreal yc, qreal radius,
                    qreal sar, qreal ear,
                    bool anticlockwise)
{
    //### HACK
    // In Qt we don't switch the coordinate system for degrees
    // and still use the 0,0 as bottom left for degrees so we need
    // to switch
    sar = -sar;
    ear = -ear;
    anticlockwise = !anticlockwise;
    //end hack

    float sa = DEGREES(sar);
    float ea = DEGREES(ear);

    double span = 0;

    double xs     = xc - radius;
    double ys     = yc - radius;
    double width  = radius*2;
    double height = radius*2;

    if (!anticlockwise && (ea < sa)) {
        span += 360;
    } else if (anticlockwise && (sa < ea)) {
        span -= 360;
    }

    //### this is also due to switched coordinate system
    // we would end up with a 0 span instead of 360
    if (!(qFuzzyCompare(span + (ea - sa), 0.0) &&
          qFuzzyCompare(qAbs(span), 360.0))) {
        span   += ea - sa;
    }

    QPainterPath path;
    path.moveTo(QPointF(xc + radius  * cos(sar),
                                yc - radius  * sin(sar)));

    path.arcTo(xs, ys, width, height, sa, span);
    path = m_state.matrix.map(path);
    m_path.addPath(path);
}


void Context2D::fill()
{
    m_painter.fillPath(m_path, m_painter.brush());
    m_state.creatingShape = false;
}


void Context2D::stroke()
{
    m_painter.strokePath(m_path, m_painter.pen());
    m_state.creatingShape = false;
}


void Context2D::clip()
{
    m_painter.setClipPath(m_path);
}


bool Context2D::isPointInPath(qreal x, qreal y) const
{
    return m_path.contains(QPointF(x, y));
}


ImageData Context2D::getImageData(qreal sx, qreal sy, qreal sw, qreal sh)
{
    Q_UNUSED(sx);
    Q_UNUSED(sy);
    Q_UNUSED(sw);
    Q_UNUSED(sh);
    return ImageData();
}


void Context2D::putImageData(ImageData image, qreal dx, qreal dy)
{
    Q_UNUSED(image);
    Q_UNUSED(dx);
    Q_UNUSED(dy);
}

Context2D::Context2D(QContext2DCanvas *parent)
    : QObject(parent),
      m_cache(parent->size(), QImage::Format_ARGB32_Premultiplied)
{
    m_cache.fill(qRgba(0,0,0,0));
    CanvasGradientData::setup(parent->engine());

    begin();
}

const QImage &Context2D::end()
{
    if (m_painter.isActive())
        m_painter.end();
    m_state.creatingShape = false;
    return m_cache;
}

void Context2D::begin()
{
    if (!m_painter.isActive()) {
        m_painter.begin(&m_cache);
        m_painter.setRenderHint(QPainter::Antialiasing);
        m_painter.setBrush(Qt::black);
    }
}

void Context2D::clear()
{
    m_cache.fill(qRgba(0,0,0,0));
}

void Context2D::setSize(int w, int h)
{
    if (m_painter.isActive())
        end();
    QImage newi(w, h, QImage::Format_ARGB32_Premultiplied);
    newi.fill(qRgba(0,0,0,0));
    QPainter p(&newi);
    p.drawImage(0, 0, m_cache);
    p.end();
    m_cache = newi;
    begin();
}

void Context2D::drawImage(DomImage *image, qreal dx, qreal dy)
{
    if (!image)
        return;
    if (dx < 0) {
        qreal sx = qAbs(dx);
        qreal sy = qAbs(dy);
        qreal sw = image->width() - sx;
        qreal sh = image->height() - sy;

        drawImage(image, sx, sy, sw, sh, 0, 0, sw, sh);
    } else {
        m_painter.drawImage(QPointF(dx, dy), image->image());
    }
}

void Context2D::drawImage(DomImage *image, qreal dx, qreal dy,
                          qreal dw, qreal dh)
{
    if (!image)
        return;
    m_painter.drawImage(QRectF(dx, dy, dw, dh).toRect(), image->image());
}

void Context2D::drawImage(DomImage *image, qreal sx, qreal sy,
                          qreal sw, qreal sh, qreal dx, qreal dy,
                          qreal dw, qreal dh)
{
    if (!image)
        return;
    m_painter.drawImage(QRectF(dx, dy, dw, dh), image->image(),
                        QRectF(sx, sy, sw, sh));
}