VelocityRec RectGridVel_c::GetPatValue(WorldPoint p)
{
long rowNum, colNum;
VelocityRec velocity;
LongRect gridLRect, geoRect;
ScaleRec thisScaleRec;
SetLRect(&gridLRect, 0, fNumRows, fNumCols, 0);
SetLRect(&geoRect, fGridBounds.loLong, fGridBounds.loLat, fGridBounds.hiLong, fGridBounds.hiLat);
GetLScaleAndOffsets(&geoRect, &gridLRect, &thisScaleRec);
// gridP = WorldToScreenPoint(p, bounds, CATSgridRect);
colNum = (long)(p.pLong * thisScaleRec.XScale + thisScaleRec.XOffset);
rowNum = (long)(p.pLat * thisScaleRec.YScale + thisScaleRec.YOffset);
if (!fGridHdl ||
colNum < 0 || colNum >= fNumCols ||
rowNum < 0 || rowNum >= fNumRows)
{
velocity.u = 0.0;
velocity.v = 0.0;
return velocity;
}
return INDEXH(fGridHdl, rowNum * fNumCols + colNum);
}
long GridWndMover_c::GetVelocityIndex(WorldPoint p)
{
long rowNum, colNum;
VelocityRec velocity;
LongRect gridLRect, geoRect;
ScaleRec thisScaleRec;
TRectGridVel* rectGrid = (TRectGridVel*)fGrid; // fNumRows, fNumCols members of GridWndMover
WorldRect bounds = rectGrid->GetBounds();
SetLRect (&gridLRect, 0, fNumRows, fNumCols, 0);
SetLRect (&geoRect, bounds.loLong, bounds.loLat, bounds.hiLong, bounds.hiLat);
GetLScaleAndOffsets (&geoRect, &gridLRect, &thisScaleRec);
colNum = p.pLong * thisScaleRec.XScale + thisScaleRec.XOffset;
rowNum = p.pLat * thisScaleRec.YScale + thisScaleRec.YOffset;
if (colNum < 0 || colNum >= fNumCols || rowNum < 0 || rowNum >= fNumRows)
{ return -1; }
return rowNum * fNumCols + colNum;
}
OSErr SegmentToRgn (SegmentsHdl theSegment, PolyObjectHdl newPoly)
// newPoly must be a polygon without any points added
{
Boolean DrawFromSegFlag;
long SegCount, SegIndex, SegIndexPlus;
LongPoint MatrixPt;
PolyObjectHdl newPolyHdl = nil;
OSErr err = noErr;
LongRect emptyLRect;
// set region rect to empty to start with
SetLRect (&emptyLRect, kWorldRight, kWorldBottom, kWorldLeft, kWorldTop);
SegCount = _GetHandleSize ((Handle) theSegment) / sizeof (Segment);
if (SegCount > 0)
{
DrawFromSegFlag = true;
for (SegIndex = 0; SegIndex < SegCount; ++SegIndex)
{
if (DrawFromSegFlag) /* start of new poly */
{
/* create a new polygon object */
CreateNewPtsHdl (newPolyHdl, 0);
/* mark the newly added polygon */
SetObjectMarked ((ObjectRecHdl) newPolyHdl, true);
/* set bounds to empty rect */
SetObjectLRect ((ObjectRecHdl) newPolyHdl, &emptyLRect);
if (!err)
{
MatrixPt.h = (*theSegment) [SegIndex].fromLong;
MatrixPt.v = (*theSegment) [SegIndex].fromLat;
AddPointToPoly (newPolyHdl, &MatrixPt);
DrawFromSegFlag = false;
}
}
MatrixPt.h = (*theSegment) [SegIndex].toLong;
MatrixPt.v = (*theSegment) [SegIndex].toLat;
AddPointToPoly (newPolyHdl, &MatrixPt);
SegIndexPlus = SegIndex + 1;
if (SegIndexPlus == SegCount)
SegIndexPlus = 0;
/* check for end of current poly */
if (((*theSegment) [SegIndex].toLat != (*theSegment) [SegIndexPlus].fromLat ||
(*theSegment) [SegIndex].toLong != (*theSegment) [SegIndexPlus].fromLong))
{
DrawFromSegFlag = true;
}
}
}
return err;
}
void CalcSetPolyLRect (PolyObjectHdl thePolyHdl)
{
LongRect ObjectLRect;
long PointCount, PointIndex;
LongPoint MatrixPt;
LongPoint **thisPtsHdl = nil;
if (thePolyHdl != nil)
{
thisPtsHdl = GetPolyPointsHdl (thePolyHdl);
PointCount = GetPolyPointCount (thePolyHdl);
/* set region rect to empty to start with */
SetLRect (&ObjectLRect, kWorldRight, kWorldBottom, kWorldLeft, kWorldTop);
for (PointIndex = 1; PointIndex <= PointCount; ++PointIndex)
{
MatrixPt = (*thisPtsHdl) [PointIndex - 1];
if (MatrixPt.h < ObjectLRect.left) ObjectLRect.left = MatrixPt.h;
if (MatrixPt.v > ObjectLRect.top) ObjectLRect.top = MatrixPt.v;
if (MatrixPt.h > ObjectLRect.right) ObjectLRect.right = MatrixPt.h;
if (MatrixPt.v < ObjectLRect.bottom) ObjectLRect.bottom = MatrixPt.v;
}
SetObjectLRect ((ObjectRecHdl) thePolyHdl, &ObjectLRect);
}
return;
}
VelocityRec RectGridVel_c::GetSmoothVelocity(WorldPoint p)
{
long rowNum, colNum;
VelocityRec velocity, velNew;
LongRect gridLRect, geoRect;
ScaleRec thisScaleRec;
SetLRect(&gridLRect, 0, fNumRows, fNumCols, 0);
SetLRect(&geoRect, fGridBounds.loLong, fGridBounds.loLat, fGridBounds.hiLong, fGridBounds.hiLat);
GetLScaleAndOffsets(&geoRect, &gridLRect, &thisScaleRec);
colNum = (long)(p.pLong * thisScaleRec.XScale + thisScaleRec.XOffset);
rowNum = (long)(p.pLat * thisScaleRec.YScale + thisScaleRec.YOffset);
velocity = GetPatValue(p);
if (colNum > 0 && colNum < fNumCols - 1 &&
rowNum > 0 && rowNum < fNumRows - 1)
{
VelocityRec topV, leftV, bottomV, rightV;
topV = INDEXH (fGridHdl, rowNum + 1 * fNumCols + colNum);
bottomV = INDEXH (fGridHdl, rowNum - 1 * fNumCols + colNum);
leftV = INDEXH (fGridHdl, rowNum * fNumCols + colNum - 1);
rightV = INDEXH (fGridHdl, rowNum * fNumCols + colNum + 1);
velNew.u = .5 * velocity.u + .125 * (topV.u + bottomV.u + leftV.u + rightV.u);
velNew.v = .5 * velocity.v + .125 * (topV.v + bottomV.v + leftV.v + rightV.v);
}
else
velNew = velocity;
return velNew;
}
void SetObjectLPoint (ObjectRecHdl ObjectHdl, LongPoint *objectLPointPtr)
{
OSType thisObjectType;
(**ObjectHdl).objectLPoint = *objectLPointPtr;
GetObjectType (ObjectHdl, &thisObjectType);
if (thisObjectType == kSymbolType)
{
LongRect thisObjectLRect;
SetLRect (&thisObjectLRect, objectLPointPtr -> h, objectLPointPtr -> v,
objectLPointPtr -> h, objectLPointPtr -> v);
SetObjectLRect (ObjectHdl, &thisObjectLRect);
}
return;
}
OSErr IntersectPoly (PolyObjectHdl MainPolyHdl, LongRect *sectLRect, CMyList *theObjectList)
{
SegmentsHdl SectSegHdl = nil;
CMyList *sectPolyList = nil;
PolyObjectHdl newPolyHdl = nil;
OSErr err = noErr;
SectSegHdl = MakeSectPoly (sectLRect, MainPolyHdl);
if (SectSegHdl != nil)
{
Boolean DrawFromSegFlag;
long SegCount, SegIndex, SegIndexPlus;
LongPoint MatrixPt;
LongRect emptyLRect;
/* set region rect to empty to start with */
SetLRect (&emptyLRect, kWorldRight, kWorldBottom, kWorldLeft, kWorldTop);
SegCount = _GetHandleSize ((Handle) SectSegHdl) / sizeof (Segment);
if (SegCount > 0)
{
DrawFromSegFlag = true;
for (SegIndex = 0; SegIndex < SegCount; ++SegIndex)
{
if (DrawFromSegFlag) /* start of new poly */
{
/* create a new polygon object */
newPolyHdl = MainPolyHdl;
err = _HandToHand((Handle *) &newPolyHdl);
if (!err) /* create new points handle */
{
CreateNewPtsHdl (newPolyHdl, 0);
/* mark the new polygon */
SetObjectMarked ((ObjectRecHdl) newPolyHdl, true);
/* set bounds to empty rect */
SetObjectLRect ((ObjectRecHdl) newPolyHdl, &emptyLRect);
/* add polygon to objects list */
theObjectList -> AppendItem ((Ptr) &newPolyHdl);
}
if (!err)
{
MatrixPt.h = (*SectSegHdl) [SegIndex].fromLong;
MatrixPt.v = (*SectSegHdl) [SegIndex].fromLat;
AddPointToPoly (newPolyHdl, &MatrixPt);
DrawFromSegFlag = false;
}
}
MatrixPt.h = (*SectSegHdl) [SegIndex].toLong;
MatrixPt.v = (*SectSegHdl) [SegIndex].toLat;
AddPointToPoly (newPolyHdl, &MatrixPt);
SegIndexPlus = SegIndex + 1;
if (SegIndexPlus == SegCount)
SegIndexPlus = 0;
/* check for end of current poly */
if (((*SectSegHdl) [SegIndex].toLat != (*SectSegHdl) [SegIndexPlus].fromLat ||
(*SectSegHdl) [SegIndex].toLong != (*SectSegHdl) [SegIndexPlus].fromLong))
{
DrawFromSegFlag = true;
}
}
}
}
else
err = memFullErr;
if (err == memFullErr)
TechError ("IntersectPoly()", "Out of memory while intersecting polgons!", err);
else if (err)
TechError ("IntersectPoly()", "Error while intersecting polygons!", err);
return err;
}
