context2d.cpp Example File | Qt Script

- Qt 5.5
- Qt Script
- Context2D Example
- context2d.cpp Example File
- Qt 5.5.1 Reference Documentation

# context2d.cpp Example File

script/context2d/context2d.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
    ** met:
    **   * Redistributions of source code must retain the above copyright
    **     notice, this list of conditions and the following disclaimer.
    **   * Redistributions in binary form must reproduce the above copyright
    **     notice, this list of conditions and the following disclaimer in
    **     the documentation and/or other materials provided with the
    **     distribution.
    **   * Neither the name of The Qt Company Ltd nor the names of its
    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
    **
    **
    ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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    ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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    ** $QT_END_LICENSE$
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    ****************************************************************************/

    #include "context2d.h"

    #include <QVariant>

    #include <math.h>
    static const double Q_PI   = 3.14159265358979323846;   // pi

    #define DEGREES(t) ((t) * 180.0 / Q_PI)

    #define qClamp(val, min, max) qMin(qMax(val, min), max)
    static QList<qreal> parseNumbersList(QString::const_iterator &itr)
    {
        QList<qreal> points;
        QString temp;
        while ((*itr).isSpace())
            ++itr;
        while ((*itr).isNumber() ||
               (*itr) == '-' || (*itr) == '+' || (*itr) == '.') {
            temp = QString();

            if ((*itr) == '-')
                temp += *itr++;
            else if ((*itr) == '+')
                temp += *itr++;
            while ((*itr).isDigit())
                temp += *itr++;
            if ((*itr) == '.')
                temp += *itr++;
            while ((*itr).isDigit())
                temp += *itr++;
            while ((*itr).isSpace())
                ++itr;
            if ((*itr) == ',')
                ++itr;
            points.append(temp.toDouble());
            //eat spaces
            while ((*itr).isSpace())
                ++itr;
        }

        return points;
    }

    QColor colorFromString(const QString &name)
    {
        QString::const_iterator itr = name.constBegin();
        QList<qreal> compo;
        if (name.startsWith("rgba(")) {
            ++itr; ++itr; ++itr; ++itr; ++itr;
            compo = parseNumbersList(itr);
            if (compo.size() != 4) {
                return QColor();
            }
            //alpha seems to be always between 0-1
            compo[3] *= 255;
            return QColor((int)compo[0], (int)compo[1],
                          (int)compo[2], (int)compo[3]);
        } else if (name.startsWith("rgb(")) {
            ++itr; ++itr; ++itr; ++itr;
            compo = parseNumbersList(itr);
            if (compo.size() != 3) {
                return QColor();
            }
            return QColor((int)qClamp(compo[0], qreal(0), qreal(255)),
                          (int)qClamp(compo[1], qreal(0), qreal(255)),
                          (int)qClamp(compo[2], qreal(0), qreal(255)));
        } else {
            //QRgb color;
            //CSSParser::parseColor(name, color);
            return QColor(name);
        }
    }

    static QPainter::CompositionMode compositeOperatorFromString(const QString &compositeOperator)
    {
        if ( compositeOperator == "source-over" ) {
            return QPainter::CompositionMode_SourceOver;
        } else if ( compositeOperator == "source-out" ) {
            return QPainter::CompositionMode_SourceOut;
        } else if ( compositeOperator == "source-in" ) {
            return QPainter::CompositionMode_SourceIn;
        } else if ( compositeOperator == "source-atop" ) {
            return QPainter::CompositionMode_SourceAtop;
        } else if ( compositeOperator == "destination-atop" ) {
            return QPainter::CompositionMode_DestinationAtop;
        } else if ( compositeOperator == "destination-in" ) {
            return QPainter::CompositionMode_DestinationIn;
        } else if ( compositeOperator == "destination-out" ) {
            return QPainter::CompositionMode_DestinationOut;
        } else if ( compositeOperator == "destination-over" ) {
            return QPainter::CompositionMode_DestinationOver;
        } else if ( compositeOperator == "darker" ) {
            return QPainter::CompositionMode_SourceOver;
        } else if ( compositeOperator == "lighter" ) {
            return QPainter::CompositionMode_SourceOver;
        } else if ( compositeOperator == "copy" ) {
            return QPainter::CompositionMode_Source;
        } else if ( compositeOperator == "xor" ) {
            return QPainter::CompositionMode_Xor;
        }

        return QPainter::CompositionMode_SourceOver;
    }

    static QString compositeOperatorToString(QPainter::CompositionMode op)
    {
        switch (op) {
        case QPainter::CompositionMode_SourceOver:
            return "source-over";
        case QPainter::CompositionMode_DestinationOver:
            return "destination-over";
        case QPainter::CompositionMode_Clear:
            return "clear";
        case QPainter::CompositionMode_Source:
            return "source";
        case QPainter::CompositionMode_Destination:
            return "destination";
        case QPainter::CompositionMode_SourceIn:
            return "source-in";
        case QPainter::CompositionMode_DestinationIn:
            return "destination-in";
        case QPainter::CompositionMode_SourceOut:
            return "source-out";
        case QPainter::CompositionMode_DestinationOut:
            return "destination-out";
        case QPainter::CompositionMode_SourceAtop:
            return "source-atop";
        case QPainter::CompositionMode_DestinationAtop:
            return "destination-atop";
        case QPainter::CompositionMode_Xor:
            return "xor";
        case QPainter::CompositionMode_Plus:
            return "plus";
        case QPainter::CompositionMode_Multiply:
            return "multiply";
        case QPainter::CompositionMode_Screen:
            return "screen";
        case QPainter::CompositionMode_Overlay:
            return "overlay";
        case QPainter::CompositionMode_Darken:
            return "darken";
        case QPainter::CompositionMode_Lighten:
            return "lighten";
        case QPainter::CompositionMode_ColorDodge:
            return "color-dodge";
        case QPainter::CompositionMode_ColorBurn:
            return "color-burn";
        case QPainter::CompositionMode_HardLight:
            return "hard-light";
        case QPainter::CompositionMode_SoftLight:
            return "soft-light";
        case QPainter::CompositionMode_Difference:
            return "difference";
        case QPainter::CompositionMode_Exclusion:
            return "exclusion";
        default:
            break;
        }
        return QString();
    }

    void Context2D::save()
    {
        m_stateStack.push(m_state);
    }

    void Context2D::restore()
    {
        if (!m_stateStack.isEmpty()) {
            m_state = m_stateStack.pop();
            m_state.flags = AllIsFullOfDirt;
        }
    }

    void Context2D::scale(qreal x, qreal y)
    {
        m_state.matrix.scale(x, y);
        m_state.flags |= DirtyTransformationMatrix;
    }

    void Context2D::rotate(qreal angle)
    {
        m_state.matrix.rotate(DEGREES(angle));
        m_state.flags |= DirtyTransformationMatrix;
    }

    void Context2D::translate(qreal x, qreal y)
    {
        m_state.matrix.translate(x, y);
        m_state.flags |= DirtyTransformationMatrix;
    }

    void Context2D::transform(qreal m11, qreal m12, qreal m21, qreal m22,
                              qreal dx, qreal dy)
    {
        QMatrix mat(m11, m12,
                    m21, m22,
                    dx, dy);
        m_state.matrix *= mat;
        m_state.flags |= DirtyTransformationMatrix;
    }

    void Context2D::setTransform(qreal m11, qreal m12, qreal m21, qreal m22,
                                 qreal dx, qreal dy)
    {
        QMatrix mat(m11, m12,
                    m21, m22,
                    dx, dy);
        m_state.matrix = mat;
        m_state.flags |= DirtyTransformationMatrix;
    }

    QString Context2D::globalCompositeOperation() const
    {
        return compositeOperatorToString(m_state.globalCompositeOperation);
    }

    void Context2D::setGlobalCompositeOperation(const QString &op)
    {
        QPainter::CompositionMode mode =
            compositeOperatorFromString(op);
        m_state.globalCompositeOperation = mode;
        m_state.flags |= DirtyGlobalCompositeOperation;
    }

    QVariant Context2D::strokeStyle() const
    {
        return m_state.strokeStyle;
    }

    void Context2D::setStrokeStyle(const QVariant &style)
    {
        if (style.canConvert<CanvasGradient>()) {
            CanvasGradient cg = qvariant_cast<CanvasGradient>(style);
            m_state.strokeStyle = cg.value;
        } else {
            QColor color = colorFromString(style.toString());
            m_state.strokeStyle = color;
        }
        m_state.flags |= DirtyStrokeStyle;
    }

    QVariant Context2D::fillStyle() const
    {
        return m_state.fillStyle;
    }

    void Context2D::setFillStyle(const QVariant &style)
    {
        if (style.canConvert<CanvasGradient>()) {
            CanvasGradient cg = qvariant_cast<CanvasGradient>(style);
            m_state.fillStyle = cg.value;
        } else {
            QColor color = colorFromString(style.toString());
            m_state.fillStyle = color;
        }
        m_state.flags |= DirtyFillStyle;
    }

    qreal Context2D::globalAlpha() const
    {
        return m_state.globalAlpha;
    }

    void Context2D::setGlobalAlpha(qreal alpha)
    {
        m_state.globalAlpha = alpha;
        m_state.flags |= DirtyGlobalAlpha;
    }

    CanvasGradient Context2D::createLinearGradient(qreal x0, qreal y0,
                                                   qreal x1, qreal y1)
    {
        QLinearGradient g(x0, y0, x1, y1);
        return CanvasGradient(g);
    }

    CanvasGradient Context2D::createRadialGradient(qreal x0, qreal y0,
                                                   qreal r0, qreal x1,
                                                   qreal y1, qreal r1)
    {
        QRadialGradient g(QPointF(x1, y1), r0+r1, QPointF(x0, y0));
        return CanvasGradient(g);
    }

    qreal Context2D::lineWidth() const
    {
        return m_state.lineWidth;
    }

    void Context2D::setLineWidth(qreal w)
    {
        m_state.lineWidth = w;
        m_state.flags |= DirtyLineWidth;
    }

    QString Context2D::lineCap() const
    {
        switch (m_state.lineCap) {
        case Qt::FlatCap:
            return "butt";
        case Qt::SquareCap:
            return "square";
        case Qt::RoundCap:
            return "round";
        default: ;
        }
        return QString();
    }

    void Context2D::setLineCap(const QString &capString)
    {
        Qt::PenCapStyle style;
        if (capString == "round")
            style = Qt::RoundCap;
        else if (capString == "square")
            style = Qt::SquareCap;
        else //if (capString == "butt")
            style = Qt::FlatCap;
        m_state.lineCap = style;
        m_state.flags |= DirtyLineCap;
    }

    QString Context2D::lineJoin() const
    {
        switch (m_state.lineJoin) {
        case Qt::RoundJoin:
            return "round";
        case Qt::BevelJoin:
            return "bevel";
        case Qt::MiterJoin:
            return "miter";
        default: ;
        }
        return QString();
    }

    void Context2D::setLineJoin(const QString &joinString)
    {
        Qt::PenJoinStyle style;
        if (joinString == "round")
            style = Qt::RoundJoin;
        else if (joinString == "bevel")
            style = Qt::BevelJoin;
        else //if (joinString == "miter")
            style = Qt::MiterJoin;
        m_state.lineJoin = style;
        m_state.flags |= DirtyLineJoin;
    }

    qreal Context2D::miterLimit() const
    {
        return m_state.miterLimit;
    }

    void Context2D::setMiterLimit(qreal m)
    {
        m_state.miterLimit = m;
        m_state.flags |= DirtyMiterLimit;
    }

    void Context2D::setShadowOffsetX(qreal x)
    {
        m_state.shadowOffsetX = x;
        m_state.flags |= DirtyShadowOffsetX;
    }

    void Context2D::setShadowOffsetY(qreal y)
    {
        m_state.shadowOffsetY = y;
        m_state.flags |= DirtyShadowOffsetY;
    }

    void Context2D::setShadowBlur(qreal b)
    {
        m_state.shadowBlur = b;
        m_state.flags |= DirtyShadowBlur;
    }

    void Context2D::setShadowColor(const QString &str)
    {
        m_state.shadowColor = colorFromString(str);
        m_state.flags |= DirtyShadowColor;
    }

    qreal Context2D::shadowOffsetX() const
    {
        return m_state.shadowOffsetX;
    }

    qreal Context2D::shadowOffsetY() const
    {
        return m_state.shadowOffsetY;
    }

    qreal Context2D::shadowBlur() const
    {
        return m_state.shadowBlur;
    }

    QString Context2D::shadowColor() const
    {
        return m_state.shadowColor.name();
    }

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

    void Context2D::fillRect(qreal x, qreal y, qreal w, qreal h)
    {
        beginPainting();
        m_painter.save();
        m_painter.setMatrix(m_state.matrix, false);
        m_painter.fillRect(QRectF(x, y, w, h), m_painter.brush());
        m_painter.restore();
        scheduleChange();
    }

    void Context2D::strokeRect(qreal x, qreal y, qreal w, qreal h)
    {
        QPainterPath path;
        path.addRect(x, y, w, h);
        beginPainting();
        m_painter.save();
        m_painter.setMatrix(m_state.matrix, false);
        m_painter.strokePath(path, m_painter.pen());
        m_painter.restore();
        scheduleChange();
    }

    void Context2D::beginPath()
    {
        m_path = QPainterPath();
    }

    void Context2D::closePath()
    {
        m_path.closeSubpath();
    }

    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) + 1, 1) &&
              qFuzzyCompare(qAbs(span), 360))) {
            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()
    {
        beginPainting();
        m_painter.fillPath(m_path, m_painter.brush());
        scheduleChange();
    }

    void Context2D::stroke()
    {
        beginPainting();
        m_painter.save();
        m_painter.setMatrix(m_state.matrix, false);
        QPainterPath tmp = m_state.matrix.inverted().map(m_path);
        m_painter.strokePath(tmp, m_painter.pen());
        m_painter.restore();
        scheduleChange();
    }

    void Context2D::clip()
    {
        m_state.clipPath = m_path;
        m_state.flags |= DirtyClippingRegion;
    }

    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(QObject *parent)
        : QObject(parent), m_changeTimerId(-1)
    {
        reset();
    }

    const QImage &Context2D::endPainting()
    {
        if (m_painter.isActive())
            m_painter.end();
        return m_image;
    }

    void Context2D::beginPainting()
    {
        if (!m_painter.isActive()) {
            m_painter.begin(&m_image);
            m_painter.setRenderHint(QPainter::Antialiasing);
            if (!m_state.clipPath.isEmpty())
                m_painter.setClipPath(m_state.clipPath);
            m_painter.setBrush(m_state.fillStyle);
            m_painter.setOpacity(m_state.globalAlpha);
            QPen pen;
            pen.setBrush(m_state.strokeStyle);
            if (pen.style() == Qt::NoPen)
                pen.setStyle(Qt::SolidLine);
            pen.setCapStyle(m_state.lineCap);
            pen.setJoinStyle(m_state.lineJoin);
            pen.setWidthF(m_state.lineWidth);
            pen.setMiterLimit(m_state.miterLimit);
            m_painter.setPen(pen);
        } else {
            if ((m_state.flags & DirtyClippingRegion) && !m_state.clipPath.isEmpty())
                m_painter.setClipPath(m_state.clipPath);
            if (m_state.flags & DirtyFillStyle)
                m_painter.setBrush(m_state.fillStyle);
            if (m_state.flags & DirtyGlobalAlpha)
                m_painter.setOpacity(m_state.globalAlpha);
            if (m_state.flags & DirtyGlobalCompositeOperation)
                m_painter.setCompositionMode(m_state.globalCompositeOperation);
            if (m_state.flags & MDirtyPen) {
                QPen pen = m_painter.pen();
                if (m_state.flags & DirtyStrokeStyle)
                    pen.setBrush(m_state.strokeStyle);
                if (m_state.flags & DirtyLineWidth)
                    pen.setWidthF(m_state.lineWidth);
                if (m_state.flags & DirtyLineCap)
                    pen.setCapStyle(m_state.lineCap);
                if (m_state.flags & DirtyLineJoin)
                    pen.setJoinStyle(m_state.lineJoin);
                if (m_state.flags & DirtyMiterLimit)
                    pen.setMiterLimit(m_state.miterLimit);
                m_painter.setPen(pen);
            }
            m_state.flags = 0;
        }
    }

    void Context2D::clear()
    {
        endPainting();
        m_image.fill(qRgba(0,0,0,0));
        scheduleChange();
    }

    void Context2D::reset()
    {
        m_stateStack.clear();
        m_state.matrix = QMatrix();
        m_state.clipPath = QPainterPath();
        m_state.globalAlpha = 1.0;
        m_state.globalCompositeOperation = QPainter::CompositionMode_SourceOver;
        m_state.strokeStyle = Qt::black;
        m_state.fillStyle = Qt::black;
        m_state.lineWidth = 1;
        m_state.lineCap = Qt::FlatCap;
        m_state.lineJoin = Qt::MiterJoin;
        m_state.miterLimit = 10;
        m_state.shadowOffsetX = 0;
        m_state.shadowOffsetY = 0;
        m_state.shadowBlur = 0;
        m_state.shadowColor = qRgba(0, 0, 0, 0);
        m_state.flags = AllIsFullOfDirt;
        clear();
    }

    void Context2D::setSize(int width, int height)
    {
        endPainting();
        QImage newi(width, height, QImage::Format_ARGB32_Premultiplied);
        newi.fill(qRgba(0,0,0,0));
        QPainter p(&newi);
        p.drawImage(0, 0, m_image);
        p.end();
        m_image = newi;
        scheduleChange();
    }

    void Context2D::setSize(const QSize &size)
    {
        setSize(size.width(), size.height());
    }

    QSize Context2D::size() const
    {
        return m_image.size();
    }

    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 {
            beginPainting();
            m_painter.drawImage(QPointF(dx, dy), image->image());
            scheduleChange();
        }
    }

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

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

    void Context2D::scheduleChange()
    {
        if (m_changeTimerId == -1)
            m_changeTimerId = startTimer(0);
    }

    void Context2D::timerEvent(QTimerEvent *e)
    {
        if (e->timerId() == m_changeTimerId) {
            killTimer(m_changeTimerId);
            m_changeTimerId = -1;
            emit changed(endPainting());
        } else {
            QObject::timerEvent(e);
        }
    }