Line getLineinRect(Line& sLine, Rect& area) {
if (!intersectLineRect(sLine, area))
return {Point(0,0), Point(0,0)};
Point A(area.x, area.y);
Point B(area.x+area.width, area.y);
Point C(area.x+area.width, area.y+area.height);
Point D(area.x, area.y+area.height);
Line segAB = {A, B};
Line segBC = {B, C};
Line segCD = {C, D};
Line segDA = {D, A};
if (sLine.end.x == sLine.begin.x)
return {{sLine.begin.x, A.y}, {sLine.begin.x, D.y}};
double k = (double)(sLine.end.y - sLine.begin.y)/(sLine.end.x - sLine.begin.x);
if (k == 0)
return {{A.x, sLine.begin.y}, {B.x, sLine.begin.y}};
double b = (double)(sLine.begin.x*sLine.end.y - sLine.begin.y*sLine.end.x)/(sLine.begin.x - sLine.end.x);
vector<Point> cache;
if (ifLineCrossSeg(sLine, segAB))
cache.push_back(Point((A.y-b)/k, A.y));
if (ifLineCrossSeg(sLine, segBC))
cache.push_back(Point(B.x, k*B.x+b));
if (ifLineCrossSeg(sLine, segCD))
cache.push_back(Point((C.y-b)/k, C.y));
if (ifLineCrossSeg(sLine, segDA))
cache.push_back(Point(D.x, k*D.x+b));
return {cache[0], cache[1]};
}
bool UIRectangleMouseTransformFunctor::viewportToRenderingSurface(const Pnt2f& ViewportPoint,
const Viewport* TheViewport,
Pnt2f& Result) const
{
//Get Viewport to View Space line
Line l;
if( !TheViewport->getCamera()->calcViewRay( l, ViewportPoint.x(), ViewportPoint.y(), *TheViewport ) )
{
return false;
}
//Transform Line to UIRectangle Space
Matrix m ;
getParent()->accumulateMatrix(m);
m.invert();
Pnt3f pos;
Vec3f dir;
m.multFull(l.getPosition (), pos);
m.mult (l.getDirection(), dir);
l.setValue(pos, dir);
//ia->scale(dir.length());
//Intersect the Line with the UIRectangle quad
Real32 t;
if(!intersectLineRect(l,getParent()->getPoint(),
getParent()->getPoint() + Vec3f(getParent()->getWidth(),0,0),
getParent()->getPoint() + Vec3f(getParent()->getWidth(),getParent()->getHeight(),0),
getParent()->getPoint() + Vec3f(0,getParent()->getHeight(),0)
,t))
{
return false;
}
//Return the point on the quad of the intersection if there was one
Result.setValues(l.getPosition().x() + t*l.getDirection().x() - getParent()->getPoint().x(),
getParent()->getHeight() - l.getPosition().y() - t*l.getDirection().y() + getParent()->getPoint().y());
return true;
}
