Example #1
0
bool GiGraphics::drawPolygon(const GiContext* ctx, int count, 
                             const Point2d* points, bool modelUnit)
{
    if (m_impl->drawRefcnt == 0 || count < 2 || points == NULL)
        return false;
    GiLock lock (&m_impl->drawRefcnt);
    if (count > 0x2000)
        count = 0x2000;

    bool ret = false;

    const Box2d extent (count, points);                 // 模型坐标范围
    if (!DRAW_RECT(m_impl, modelUnit).isIntersect(extent))  // 全部在显示区域外
        return false;

    if (DRAW_MAXR(m_impl, modelUnit).contains(extent))  // 全部在显示区域内
    {
        ret = _DrawPolygon(m_impl->canvas, ctx, 
            count, points, true, true, true, modelUnit);
    }
    else                                                // 部分在显示区域内
    {
        PolygonClip clip (m_impl->rectDraw);
        if (!clip.clip(count, points, &S2D(xf(), modelUnit)))  // 多边形剪裁
            return false;
        count = clip.getCount();
        points = clip.getPoints();

        ret = _DrawPolygon(m_impl->canvas, ctx, 
            count, points, false, true, false, modelUnit);

        int ienter = findInvisibleEdge(clip);
        if (ienter == count)
        {
            ret = _DrawPolygon(m_impl->canvas, ctx, count, points, 
                false, false, true, modelUnit) || ret;
        }
        else
        {
            ret = drawPolygonEdge(PolylineAux(this, ctx), count, clip, ienter) || ret;
        }
    }

    return ret;
}
Example #2
0
bool GiGraphics::drawPolygon(const GiContext* ctx, int count, 
                             const Point2d* points, bool modelUnit)
{
    if (count < 2 || !points || isStopping())
        return false;
    
    count = count > 0x2000 ? 0x2000 : count;
    ctx = ctx ? ctx : &(m_impl->ctx);

    bool ret = false;

    const Box2d extent (count, points);                         // 模型坐标范围
    if (!DRAW_RECT(m_impl, modelUnit).isIntersect(extent))      // 全部在显示区域外
        return false;

    if (DRAW_MAXR(m_impl, modelUnit).contains(extent)) {        // 全部在显示区域内
        ret = _drawPolygon(ctx, count, points, true, true, true, modelUnit);
    } else {                                                    // 部分在显示区域内
        PolygonClip clip (m_impl->rectDraw);
        if (!clip.clip(count, points, &S2D(xf(), modelUnit)))   // 多边形剪裁
            return false;
        count = clip.getCount();
        points = clip.getPoints();

        ret = _drawPolygon(ctx, count, points, false, true, false, modelUnit);

        int ienter = findInvisibleEdge(clip);
        if (ienter == count) {
            ret = _drawPolygon(ctx, count, points, false, false, true, modelUnit) || ret;
        } else {
            ret = drawPolygonEdge(PolylineAux(this, ctx), count, clip, ienter) || ret;
        }
    }

    return ret;
}
Example #3
0
static inline int findInvisibleEdge(const PolygonClip& clip, int i, int end)
{
    for (; (i - end) % clip.getCount() != 0 && clip.isLinked(i); i++) ;
    return i;
}
Example #4
0
static inline int findInvisibleEdge(const PolygonClip& clip)
{
    int i = 0;
    for (; i < clip.getCount() && clip.isLinked(i); i++) ;
    return i;
}