模仿Qt实现类似drawline的功能~求解

2010-11-15 09:28:07 296 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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是这个？



void QPaintEngine::drawLines(const QLine *lines, int lineCount)

{

    struct PointF {

        qreal x;

        qreal y;

    };

    struct LineF {

        PointF p1;

        PointF p2;

    };

    Q_ASSERT(sizeof(PointF) == sizeof(QPointF));

    Q_ASSERT(sizeof(LineF) == sizeof(QLineF));

    LineF fl[256];

    while (lineCount) {

        int i = 0;

        while (i < lineCount && i < 256) {

            fl[i].p1.x = lines[i].x1();

            fl[i].p1.y = lines[i].y1();

            fl[i].p2.x = lines[i].x2();

            fl[i].p2.y = lines[i].y2();

            ++i;

        }

        drawLines((QLineF *)(void *)fl, i);

        lines += i;

        lineCount -= i;

    }

}

还是这个？



void QPainter::drawLines(const QLine *lines, int lineCount)

{

#ifdef QT_DEBUG_DRAW

    if (qt_show_painter_debug_output)

        printf("QPainter::drawLine(), line count=%d\n", lineCount);

#endif



    Q_D(QPainter);



    if (!d->engine || lineCount < 1)

        return;



    if (d->extended) {

        d->extended->drawLines(lines, lineCount);

        return;

    }



    d->updateState(d->state);



    uint lineEmulation = line_emulation(d->state->emulationSpecifier);



    if (lineEmulation) {

        if (lineEmulation == QPaintEngine::PrimitiveTransform

            && d->state->matrix.type() == QTransform::TxTranslate) {

            for (int i = 0; i < lineCount; ++i) {

                QLineF line = lines[i];

                line.translate(d->state->matrix.dx(), d->state->matrix.dy());

                d->engine->drawLines(&line, 1);

            }

        } else {

            QPainterPath linePath;

            for (int i = 0; i < lineCount; ++i) {

                linePath.moveTo(lines[i].p1());

                linePath.lineTo(lines[i].p2());

            }

            d->draw_helper(linePath, QPainterPrivate::StrokeDraw);

        }

        return;

    }

    d->engine->drawLines(lines, lineCount);

}