C++ (Cpp) rawEllipse Examples

Example #1

File: gigraph.cpp Project: Vito2015/vgcore

bool GiGraphics::drawEllipse(const GiContext* ctx, const Point2d& center, 
                             float rx, float ry, bool modelUnit)
{
    if (rx < _MGZERO || isStopping())
        return false;
    
    bool ret = false;
    Matrix2d matD(S2D(xf(), modelUnit));

    if (ry < _MGZERO) {
        ry = (Vector2d(rx, rx) * matD).x;
        ry = fabsf((Vector2d(ry, ry) * matD.inverse()).y);
    }

    const Box2d extent (center, rx*2.f, ry*2.f);            // 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 (mgIsZero(matD.m12) && mgIsZero(matD.m21)) {
        Point2d cen (center * matD);
        rx *= fabsf(matD.m11);
        ry *= fabsf(matD.m22);
        ret = rawEllipse(ctx, cen.x - rx, cen.y - ry, 2 * rx, 2 * ry);
    } else {
        Point2d pxs[13];
        mgcurv::ellipseToBezier(pxs, center, rx, ry);
        matD.transformPoints(13, pxs);

        ret = rawBeziers(ctx, pxs, 13, true);
    }

    return ret;
}

Example #2

File: gigraph.cpp Project: gkrists/TouchVG

bool GiGraphics::drawEllipse(const GiContext* ctx, const Point2d& center, 
                             float rx, float ry, bool modelUnit)
{
    if (m_impl->drawRefcnt == 0 || rx < _MGZERO)
        return false;
    GiLock lock (&m_impl->drawRefcnt);
    bool ret = false;
    Matrix2d matD(S2D(xf(), modelUnit));

    if (ry < _MGZERO) {
        ry = (Vector2d(rx, rx) * matD).x;
        ry = fabsf((Vector2d(ry, ry) * matD.inverse()).y);
    }

    const Box2d extent (center, rx*2.f, ry*2.f);            // 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 (mgIsZero(matD.m12) && mgIsZero(matD.m21))
    {
        Point2d cen (center * matD);
        rx *= fabsf(matD.m11);
        ry *= fabsf(matD.m22);

        ret = rawEllipse(ctx, cen.x - rx, cen.y - ry, 2 * rx, 2 * ry);
    }
    else
    {
        Point2d pxs[13];
        mgcurv::ellipseToBezier(pxs, center, rx, ry);
        matD.TransformPoints(13, pxs);

        ret = rawBeginPath();
        if (ret)
        {
            rawMoveTo(pxs[0].x, pxs[0].y);
            for (int i = 1; i + 2 < 13; i += 3) {
                rawBezierTo(pxs[i].x, pxs[i].y,
                    pxs[i+1].x, pxs[i+1].y, pxs[i+2].x, pxs[i+2].y);
            }
            rawClosePath();
            ret = rawEndPath(ctx, true);
        }
    }

    return ret;
}

Example #3

File: gigraph.cpp Project: acekiller/touchvg

bool GiGraphics::drawEllipse(const GiContext* ctx, const Point2d& center, 
                             float rx, float ry, bool modelUnit)
{
    if (m_impl->drawRefcnt == 0 || rx < _MGZERO)
        return false;
    GiLock lock (&m_impl->drawRefcnt);
    bool ret = false;
    Matrix2d matD(S2D(xf(), modelUnit));

    if (ry < _MGZERO)
        ry = rx;

    const Box2d extent (center, rx*2.f, ry*2.f);            // 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 (mgIsZero(matD.m12) && mgIsZero(matD.m21))
    {
        Point2d cen (center * matD);
        rx *= matD.m11;
        ry *= matD.m22;

        ret = rawEllipse(ctx, cen.x - rx, cen.y - ry, 2 * rx, 2 * ry);
    }
    else
    {
        Point2d points[13];
        mgEllipseToBezier(points, center, rx, ry);
        matD.TransformPoints(13, points);

        ret = rawBeginPath();
        if (ret)
        {
            ret = rawMoveTo(points[0].x, points[0].y);
            ret = rawBezierTo(points + 1, 12);
            ret = rawClosePath();
            ret = rawEndPath(ctx, true);
        }
    }

    return ret;
}