C++ ViewExp::GetConstructionTM方法代码示例

void gridSnap::Snap(Object* pobj, IPoint2 *p, TimeValue t)
{	

	ViewExp *vpt = theman->GetVpt();

	if ( ! vpt || ! vpt->IsAlive() )
	{
		// why are we here
		DbgAssert(!_T("Invalid viewport!"));
		return;
	}

	DbgAssert(vpt != NULL);

	//local copy of the cursor position
	Point2 fp = Point2((float)p->x, (float)p->y);

	BOOL got_one= FALSE;
	//Get point on the consttruction plane 
	Point3 local_cp = vpt->GetPointOnCP(*p);
	Point3 world_snapped;

	Matrix3 tmconst;
	vpt->GetConstructionTM( tmconst );

	// aszabo|nov.01.05|#596889, #613720, #703875 
	// In order to allow snapping to the grid sub-divisions computed based on viewport 
	// the zoom facto, the grid spacing is taken from the viewport.  
	// When the grid is invisible and the zoom factor changes, the viewport returns 
	// the grid spacing computed last time the grid was displayed.
	// When max starts up with hidden grids (via maxstart.max), the viewport's grid 
	// spacing will be zero and in that case we take the grid spacing value specified 
	// in the Grid setting UI.
	float gridSpacing = vpt->GetGridSize();
	if (!(gridSpacing > 0.0f || gridSpacing < 0.0f)) {
		gridSpacing = GetCOREInterface()->GetGridSpacing();
	}


	//Compute all the hit point candidates
	if(	GetActive(INT_SUB))
	{
		float gridZ = 0.f;
#ifdef GAME_VER
		float gridSpacing = GetCOREInterface()->GetGridSpacing();

		SnapInfo si;
		GetCOREInterface()->InitSnapInfo(&si);
		if(si.snapType == SNAP_25D)
			gridZ = GridCoord(local_cp.z,gridSpacing);

		Point3 intsnapped = Point3(GridCoord(local_cp.x,gridSpacing),GridCoord(local_cp.y,gridSpacing),gridZ);
		world_snapped = tmconst * intsnapped;//now in world space
		got_one = TRUE;

		hitmesh = new HitMesh(5);
		hitmesh->setVert(0,tmconst * Point3(intsnapped.x,intsnapped.y - gridSpacing,gridZ));
		hitmesh->setVert(1,tmconst * Point3(intsnapped.x,intsnapped.y + gridSpacing,gridZ));
		hitmesh->setVert(2,tmconst * Point3(intsnapped.x-gridSpacing,intsnapped.y,gridZ));
		hitmesh->setVert(3,tmconst * Point3(intsnapped.x + gridSpacing,intsnapped.y,gridZ));

		//now register a hit with the osnap manager
		//possibly screen for proximity to the foreground
		theman->RecordHit(new OsnapHit(world_snapped, this, INT_SUB, hitmesh));

#else //!GAME_VER
		// aszabo|sep.15.04|#596889|The gridSpacing spacing shouldn't be zero, but if it is, it can lead to infinite loops
		DbgAssert(gridSpacing > 0.0f || gridSpacing < 0.0f);
		if (gridSpacing > 0.0f || gridSpacing < 0.0f)
		{
			// Record all hits that fall in the snap preview area.
			// Grids are infinite, so we can't loop  through their "vertexes".
			// Instead go through only those that are potential snap points, by starting
			// at the closest grid point to the mouse and extending in all directions
			// using "grid size" steps.
			Point3 intsnapped = Point3(GridCoord(local_cp.x,gridSpacing),GridCoord(local_cp.y,gridSpacing),gridZ);
			Point3 curIntsnapped(intsnapped);
			world_snapped = tmconst * intsnapped;

			// set the window transform to identity to guarantee a world-screen transformation.
			if (theman->GetVpt() && theman->GetVpt()->getGW()) {
				theman->GetVpt()->getGW()->setTransform(Matrix3(TRUE));
			}
			// Find all snap points on the right side (positive x) of the intsnapped, including the intsnapped
			while (CheckPotentialHit(&world_snapped,0, fp)) 
			{
				got_one = TRUE;
				RecordNewIntSubHit(world_snapped, tmconst, curIntsnapped, gridSpacing);

				//ktong|Jan.27.2006|#748560|Limit the number of snap points to search only visibly distinct points.
				// If the grid point is too far away to tell it from the next gridpoint, stop searching.
				// No point in enumerating snap points a user can't visibly tell apart.
				// Check after the first snap point (the closest) is registered to at least have one.
				if (TooDistant(theman, world_snapped, gridSpacing)) {
					break;
				}

				// Go down the vertical grid line
				curIntsnapped.y -= gridSpacing;
				FindVerticalIntSubHit(tmconst, curIntsnapped, fp, (-gridSpacing));
//.........这里部分代码省略.........