- Qt 5.5
- Qt Widgets
- 40000 Chips
- chip.cpp Example File
- Qt 5.5.1 Reference Documentation

# chip.cpp Example File

graphicsview/chip/chip.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the demonstration applications of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:LGPL21$
    ** Commercial License Usage
    ** Licensees holding valid commercial Qt licenses may use this file in
    ** accordance with the commercial license agreement provided with the
    ** Software or, alternatively, in accordance with the terms contained in
    ** a written agreement between you and The Qt Company. For licensing terms
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    ** information use the contact form at http://www.qt.io/contact-us.
    **
    ** GNU Lesser General Public License Usage
    ** Alternatively, this file may be used under the terms of the GNU Lesser
    ** General Public License version 2.1 or version 3 as published by the Free
    ** Software Foundation and appearing in the file LICENSE.LGPLv21 and
    ** LICENSE.LGPLv3 included in the packaging of this file. Please review the
    ** following information to ensure the GNU Lesser General Public License
    ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
    ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
    **
    ** As a special exception, The Qt Company gives you certain additional
    ** rights. These rights are described in The Qt Company LGPL Exception
    ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
    **
    ** $QT_END_LICENSE$
    **
    ****************************************************************************/

    #include "chip.h"

    #include <QtWidgets>

    Chip::Chip(const QColor &color, int x, int y)
    {
        this->x = x;
        this->y = y;
        this->color = color;
        setZValue((x + y) % 2);

        setFlags(ItemIsSelectable | ItemIsMovable);
        setAcceptHoverEvents(true);
    }

    QRectF Chip::boundingRect() const
    {
        return QRectF(0, 0, 110, 70);
    }

    QPainterPath Chip::shape() const
    {
        QPainterPath path;
        path.addRect(14, 14, 82, 42);
        return path;
    }

    void Chip::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
    {
        Q_UNUSED(widget);

        QColor fillColor = (option->state & QStyle::State_Selected) ? color.dark(150) : color;
        if (option->state & QStyle::State_MouseOver)
            fillColor = fillColor.light(125);

        const qreal lod = option->levelOfDetailFromTransform(painter->worldTransform());
        if (lod < 0.2) {
            if (lod < 0.125) {
                painter->fillRect(QRectF(0, 0, 110, 70), fillColor);
                return;
            }

            QBrush b = painter->brush();
            painter->setBrush(fillColor);
            painter->drawRect(13, 13, 97, 57);
            painter->setBrush(b);
            return;
        }

        QPen oldPen = painter->pen();
        QPen pen = oldPen;
        int width = 0;
        if (option->state & QStyle::State_Selected)
            width += 2;

        pen.setWidth(width);
        QBrush b = painter->brush();
        painter->setBrush(QBrush(fillColor.dark(option->state & QStyle::State_Sunken ? 120 : 100)));

        painter->drawRect(QRect(14, 14, 79, 39));
        painter->setBrush(b);

        if (lod >= 1) {
            painter->setPen(QPen(Qt::gray, 1));
            painter->drawLine(15, 54, 94, 54);
            painter->drawLine(94, 53, 94, 15);
            painter->setPen(QPen(Qt::black, 0));
        }

        // Draw text
        if (lod >= 2) {
            QFont font("Times", 10);
            font.setStyleStrategy(QFont::ForceOutline);
            painter->setFont(font);
            painter->save();
            painter->scale(0.1, 0.1);
            painter->drawText(170, 180, QString("Model: VSC-2000 (Very Small Chip) at %1x%2").arg(x).arg(y));
            painter->drawText(170, 200, QString("Serial number: DLWR-WEER-123L-ZZ33-SDSJ"));
            painter->drawText(170, 220, QString("Manufacturer: Chip Manufacturer"));
            painter->restore();
        }

        // Draw lines
        QVarLengthArray<QLineF, 36> lines;
        if (lod >= 0.5) {
            for (int i = 0; i <= 10; i += (lod > 0.5 ? 1 : 2)) {
                lines.append(QLineF(18 + 7 * i, 13, 18 + 7 * i, 5));
                lines.append(QLineF(18 + 7 * i, 54, 18 + 7 * i, 62));
            }
            for (int i = 0; i <= 6; i += (lod > 0.5 ? 1 : 2)) {
                lines.append(QLineF(5, 18 + i * 5, 13, 18 + i * 5));
                lines.append(QLineF(94, 18 + i * 5, 102, 18 + i * 5));
            }
        }
        if (lod >= 0.4) {
            const QLineF lineData[] = {
                QLineF(25, 35, 35, 35),
                QLineF(35, 30, 35, 40),
                QLineF(35, 30, 45, 35),
                QLineF(35, 40, 45, 35),
                QLineF(45, 30, 45, 40),
                QLineF(45, 35, 55, 35)
            };
            lines.append(lineData, 6);
        }
        painter->drawLines(lines.data(), lines.size());

        // Draw red ink
        if (stuff.size() > 1) {
            QPen p = painter->pen();
            painter->setPen(QPen(Qt::red, 1, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
            painter->setBrush(Qt::NoBrush);
            QPainterPath path;
            path.moveTo(stuff.first());
            for (int i = 1; i < stuff.size(); ++i)
                path.lineTo(stuff.at(i));
            painter->drawPath(path);
            painter->setPen(p);
        }
    }

    void Chip::mousePressEvent(QGraphicsSceneMouseEvent *event)
    {
        QGraphicsItem::mousePressEvent(event);
        update();
    }

    void Chip::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
    {
        if (event->modifiers() & Qt::ShiftModifier) {
            stuff << event->pos();
            update();
            return;
        }
        QGraphicsItem::mouseMoveEvent(event);
    }

    void Chip::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
    {
        QGraphicsItem::mouseReleaseEvent(event);
        update();
    }