void MgEllipse::_update()
{
__super::_update();
mgEllipseToBezier(_bzpts, getCenter(), getWidth() / 2, getHeight() / 2);
Matrix2d mat(Matrix2d::rotation(getAngle(), getCenter()));
for (int i = 0; i < 13; i++)
_bzpts[i] *= mat;
mgBeziersBox(_extent, 13, _bzpts, true);
}
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;
}