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;
}
void MainTask(void) {
GUI_Init();
_DrawPolygon();
while (1);
}
// FillPolygon
void
Painter::FillPolygon(const BPoint* ptArray, int32 numPts,
bool closed, const pattern& p) const
{
_DrawPolygon(ptArray, numPts, closed, p, true);
}
void _HYGraphicPane::DrawPolygon (_SimpleList& r, long width)
{
Ptr p = _DefinePolygon (r);
_DrawPolygon (p, width);
_KillPolygon (p);
}
// StrokePolygon
void
Painter::StrokePolygon(const BPoint* ptArray, int32 numPts,
bool closed, const pattern& p) const
{
_DrawPolygon(ptArray, numPts, closed, p, false);
}
