pointtool.cpp

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/***************************************************************************
 *                                                                         *
 *   DrawPad - a drawing program for Opie Environment                      *
 *                                                                         *
 *   (C) 2002 by S. Prud'homme <prudhomme@laposte.net>                     *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#include "pointtool.h"

#include "drawpad.h"
#include "drawpadcanvas.h"
#include "page.h"

#include <qimage.h>

PointTool::PointTool(DrawPad* drawPad, DrawPadCanvas* drawPadCanvas)
    : Tool(drawPad, drawPadCanvas)
{
    m_mousePressed = false;
    m_polyline.resize(3);
}

PointTool::~PointTool()
{
}

void PointTool::mousePressEvent(QMouseEvent* e)
{
    m_pDrawPadCanvas->backupPage();

    m_mousePressed = true;
    m_polyline[2] = m_polyline[1] = m_polyline[0] = e->pos();
}

void PointTool::mouseReleaseEvent(QMouseEvent* e)
{
    Q_UNUSED(e)

    m_mousePressed = false;
}

void PointTool::mouseMoveEvent(QMouseEvent* e)
{
    if (m_mousePressed) {
        m_polyline[2] = m_polyline[1];
        m_polyline[1] = m_polyline[0];
        m_polyline[0] = e->pos();

        QRect r = m_polyline.boundingRect();
        r = r.normalize();
        r.setLeft(r.left() - m_pDrawPad->pen().width());
        r.setTop(r.top() - m_pDrawPad->pen().width());
        r.setRight(r.right() + m_pDrawPad->pen().width());
        r.setBottom(r.bottom() + m_pDrawPad->pen().width());

        QPainter painter;
        painter.begin(m_pDrawPadCanvas->currentPage()->pixmap());

        if (m_pDrawPad->antiAliasing()) {
            QPixmap areaPixmap(r.width(), r.height());
            bitBlt(&areaPixmap, QPoint(0, 0), painter.device(), r);

            QImage areaImage = areaPixmap.convertToImage();
            QImage bigAreaImage = areaImage.smoothScale(areaImage.width() * 3, areaImage.height() * 3);

            QPixmap bigAreaPixmap;
            bigAreaPixmap.convertFromImage(bigAreaImage);

            QPen bigAreaPen = m_pDrawPad->pen();
            bigAreaPen.setWidth(bigAreaPen.width() * 3);

            QPainter bigAreaPainter;
            bigAreaPainter.begin(&bigAreaPixmap);
            bigAreaPainter.setPen(bigAreaPen);

            QPointArray bigAreaPolyline(3);
            bigAreaPolyline.setPoint(0, (m_polyline[0].x() - r.x()) * 3 + 1, (m_polyline[0].y() - r.y()) * 3 + 1);
            bigAreaPolyline.setPoint(1, (m_polyline[1].x() - r.x()) * 3 + 1, (m_polyline[1].y() - r.y()) * 3 + 1);
            bigAreaPolyline.setPoint(2, (m_polyline[2].x() - r.x()) * 3 + 1, (m_polyline[2].y() - r.y()) * 3 + 1);

            bigAreaPainter.drawPolyline(bigAreaPolyline);
            bigAreaPainter.end();

            bigAreaImage = bigAreaPixmap.convertToImage();
            areaImage = bigAreaImage.smoothScale(bigAreaImage.width() / 3, bigAreaImage.height() / 3);
            areaPixmap.convertFromImage(areaImage);

            painter.drawPixmap(r.x(), r.y(), areaPixmap);
        } else {
            painter.setPen(m_pDrawPad->pen());
            painter.drawPolyline(m_polyline);
        }

        painter.end();

        QRect viewportRect(m_pDrawPadCanvas->contentsToViewport(r.topLeft()),
                           m_pDrawPadCanvas->contentsToViewport(r.bottomRight()));

        bitBlt(m_pDrawPadCanvas->viewport(), viewportRect.x(), viewportRect.y(),
               m_pDrawPadCanvas->currentPage()->pixmap(), r.x(), r.y(), r.width(), r.height());

        m_pDrawPadCanvas->viewport()->update(viewportRect);
    }
}

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