模仿Qt实现类似drawline的功能~求解

[cocat]

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);
}

我完全不懂Qt，上头只是叫我模仿Qt中的算法，没头绪，得用纯C写~

[cocat]

没人理~悲剧~

[dbzhang800]

[Quote=引用 1 楼 cocat 的回复:]

没人理~悲剧~
[/Quote]
别人连你想表达什么意思都不知道，怎么回复你啊。

Qt所做的，无非就是对系统底层的封装，如果你想做，需要的应该是：找本Windows编程的书，看GDI编程部分；找本Linux的书，看X11编程部分；...

各个平台都掌握之后，你再弄套接口将其统一起来

[cocat]

如果我想看到底层的代码，得怎么看？

[cocat]

我想看他底层的代码，然后模仿Qt的接口，写个画直线函数