//----------------------------------------
void ofxBox2dBody::draw() {
ofPushMatrix();
b2Vec2 p = body->GetPosition();
p *= OFX_BOX2D_SCALE;
ofTranslate(p.x, p.y);
float angle = body->GetAngle();
ofRotate(ofRadToDeg(angle));
for (b2Fixture* f=body->GetFixtureList(); f; f = f->GetNext()) {
switch (f->GetType()) {
case b2Shape::e_circle:
{
b2CircleShape* shape = dynamic_cast<b2CircleShape*>(f->GetShape());
b2Vec2 position = shape->m_p;
float radius = shape->m_radius;
_drawCircle(position, radius);
break;
}
case b2Shape::e_polygon:
{
b2PolygonShape* shape = dynamic_cast<b2PolygonShape*>(f->GetShape());
_drawPolygon(shape->m_vertices, shape->m_count);
break;
}
default:
break;
}
}
ofPopMatrix();
}
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);
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;
}