chip.cpp Example File

graphicsview/chip/chip.cpp
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#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();
}

© 2016 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.