DIRECTORY
CADTypes USING [VertexSequence, TriangleSequence],
FS USING [StreamOpen],
Imager USING [black, Context, MaskFill, MaskStroke, PathProc, SetColor, SetStrokeEnd, SetStrokeJoint, SetStrokeWidth, StrokeEnd, StrokeJoint],
ImagerColor USING [RGB],
IO USING [Close, int, PutF, real, STREAM, RopeFromROS, ROS],
RealFns USING [SqRt],
Rope USING [ROPE],
SceneUtilities USING [NewShape, ReadShape],
ThreeDBasics USING [Context, GetSurfaceType, ImagerProcRec, NatSequence, PatchProc, PtrPatch, PtrPatchSequence, PutShading, RegisterSurfaceType, ShadingValue, ShadingSequence, ShapeClass, ShapeInstance, Vertex, VertexSequence],
ThreeDHacks USING [],
ThreeDViewer USING [DrawInViewer],
Geometry3dVector USING [Triple, TripleSequence];


ThreeDHacksImpl: CEDAR PROGRAM
IMPORTS FS, Imager, IO, RealFns, SceneUtilities, ThreeDBasics, ThreeDViewer
EXPORTS ThreeDHacks
~ BEGIN

RegisterNewClasses: PUBLIC PROC [context3d: REF ThreeDBasics.Context]  ~ BEGIN
standardClass: ThreeDBasics.ShapeClass _ ThreeDBasics.GetSurfaceType[$Bezier];

standardClass.type _ $FatPoint;
standardClass.displayPatch _ FatPointDisplayProc;
ThreeDBasics.RegisterSurfaceType[standardClass, $FatPoint];

standardClass.type _ $FatSeg;
standardClass.displayPatch _ FatSegDisplayProc;
ThreeDBasics.RegisterSurfaceType[standardClass, $FatSeg];

END;

FatPointDisplayProc: ThreeDBasics.PatchProc ~ BEGIN

Path: Imager.PathProc ~ BEGIN
moveTo[[screenX+10, screenY]];
arcTo[[screenX-10, screenY], [screenX+10, screenY]];
END;
DrawFatPoint: PROCEDURE [imagerCtx: Imager.Context] ~ {
Imager.SetColor[imagerCtx, Imager.black];
Imager.MaskFill[imagerCtx, Path];
};

screenX: REAL _ patch.vtx[0].coord.sx;
screenY: REAL _ patch.vtx[0].coord.sy;

ThreeDViewer.DrawInViewer[context, NIL];
RETURN[NIL];


END;

FatSegDisplayProc: ThreeDBasics.PatchProc ~ BEGIN

Path: Imager.PathProc ~ BEGIN
moveTo[[firstScreenX, firstScreenY]];
lineTo[[secondScreenX, secondScreenY]];
END;
DrawFatSeg: PROCEDURE [imagerCtx: Imager.Context] ~ {
Imager.SetColor[imagerCtx, Imager.black];
Imager.SetStrokeWidth[imagerCtx, 5];
Imager.SetStrokeEnd[imagerCtx, round];
Imager.SetStrokeJoint[imagerCtx, round];
Imager.MaskStroke[imagerCtx, Path];
};

firstScreenX: REAL _ patch.vtx[0].coord.sx;
firstScreenY: REAL _ patch.vtx[0].coord.sy;
secondScreenX: REAL _ patch.vtx[1].coord.sx;
secondScreenY: REAL _ patch.vtx[1].coord.sy;

IF patch.clipState = clipped THEN RETURN[NIL];

ThreeDViewer.DrawInViewer[context, NIL];
RETURN[NIL];

END;

MakeFatPoint: PUBLIC PROC [name: Rope.ROPE, position: Geometry3dVector.Triple] RETURNS [newFatPoint: REF ThreeDBasics.ShapeInstance] ~ BEGIN

nullVertex: ThreeDBasics.Vertex;
nullShade: ThreeDBasics.ShadingValue;
surface: REF ThreeDBasics.PtrPatchSequence;

newFatPoint _ SceneUtilities.NewShape[name];
newFatPoint.fileName _ "";
newFatPoint.numSurfaces _ 1;
newFatPoint.insideVisible _ TRUE;

newFatPoint.vertex _ NEW[ThreeDBasics.VertexSequence[3]];
newFatPoint.shade _ NEW[ThreeDBasics.ShadingSequence[3]];
FOR i: NAT IN [0..3) DO
newFatPoint.vertex[i] _ NEW[ThreeDBasics.Vertex _ nullVertex];
newFatPoint.shade[i] _ NEW[ThreeDBasics.ShadingValue _ nullShade];
ENDLOOP;
ThreeDBasics.PutShading[newFatPoint, $Color, NEW[ImagerColor.RGB _ [0.7, 0.7, 0.7]]];

newFatPoint.vertex[0].x _ position.x;
newFatPoint.vertex[0].y _ position.y;
newFatPoint.vertex[0].z _ position.z;
newFatPoint.vertex[1].x _ position.x + 0.10;
newFatPoint.vertex[1].y _ position.y;
newFatPoint.vertex[1].z _ position.z;
newFatPoint.vertex[2].x _ position.x;
newFatPoint.vertex[2].y _ position.y + 0.01;
newFatPoint.vertex[2].z _ position.z;

newFatPoint.surface _ NEW[ThreeDBasics.PtrPatchSequence[1]];
surface _ NARROW[newFatPoint.surface, REF ThreeDBasics.PtrPatchSequence];
surface[0] _ NEW[ThreeDBasics.PtrPatch];
surface[0].vtxPtr _ NEW[ThreeDBasics.NatSequence[3]];
surface[0].vtxPtr.length _ 3;
surface[0].nVtces _ 3;
surface[0].type _ $FatPoint;
surface[0].oneSided _ FALSE;
surface[0].vtxPtr[0] _ 0;
surface[0].vtxPtr[1] _ 1;
surface[0].vtxPtr[2] _ 2;

newFatPoint.centroid.x _ position.x;
newFatPoint.centroid.y _ position.y;
newFatPoint.centroid.z _ position.z;
newFatPoint.boundingRadius _ 0.1;

END;

MakeFatSeg:  PUBLIC PROC [name: Rope.ROPE, points: Geometry3dVector.TripleSequence] RETURNS [newFatSeg: REF ThreeDBasics.ShapeInstance] ~ BEGIN

nullVertex: ThreeDBasics.Vertex;
nullShade: ThreeDBasics.ShadingValue;
surface: REF ThreeDBasics.PtrPatchSequence;
radius: REAL;

newFatSeg _ SceneUtilities.NewShape[name];
IF points.length < 2 THEN RETURN;

newFatSeg.fileName _ "";
newFatSeg.numSurfaces _ points.length - 1;
newFatSeg.insideVisible _ TRUE;

newFatSeg.vertex _ NEW[ThreeDBasics.VertexSequence[points.length]];
newFatSeg.shade _ NEW[ThreeDBasics.ShadingSequence[points.length]];
FOR i: NAT IN [0..points.length) DO
newFatSeg.vertex[i] _ NEW[ThreeDBasics.Vertex _ nullVertex];
newFatSeg.shade[i] _ NEW[ ThreeDBasics.ShadingValue _ nullShade];
ENDLOOP;
ThreeDBasics.PutShading[newFatSeg, $Color, NEW[ImagerColor.RGB _ [0.7, 0.7, 0.7]]];

FOR i: NAT IN [0..points.length) DO
newFatSeg.vertex[i].x _ points[i].x;
newFatSeg.vertex[i].y _ points[i].y;
newFatSeg.vertex[i].z _ points[i].z;
ENDLOOP;

newFatSeg.surface _ NEW[ThreeDBasics.PtrPatchSequence[points.length - 1]];
surface _ NARROW[newFatSeg.surface, REF ThreeDBasics.PtrPatchSequence];
FOR i: NAT IN [0..points.length - 1) DO
surface[i] _ NEW[ThreeDBasics.PtrPatch];
surface[i].vtxPtr _ NEW[ThreeDBasics.NatSequence[3]];
surface[i].vtxPtr.length _ 3;
surface[i].nVtces _ 3;
surface[i].type _ $FatSeg;
surface[i].oneSided _ FALSE;
surface[i].vtxPtr[0] _ i;
surface[i].vtxPtr[1] _ i + 1;
surface[i].vtxPtr[2] _ i;
ENDLOOP;

newFatSeg.centroid.x _ newFatSeg.vertex[0].x;
newFatSeg.centroid.y _ newFatSeg.vertex[0].y;
newFatSeg.centroid.z _ newFatSeg.vertex[0].z;
newFatSeg.boundingRadius _ 0;
FOR i: NAT IN [0..points.length) DO
radius _ RealFns.SqRt[ 
	  Sqr[newFatSeg.vertex[i].x - newFatSeg.centroid.x] 
+ Sqr[newFatSeg.vertex[i].y - newFatSeg.centroid.y]
+ Sqr[newFatSeg.vertex[i].z - newFatSeg.centroid.z]];
IF radius > newFatSeg.boundingRadius 
THEN newFatSeg.boundingRadius _ radius;
ENDLOOP; 

END;

MakeTwoCell: PUBLIC PROC [name: Rope.ROPE, vertices: REF CADTypes.VertexSequence, triangles: REF CADTypes.TriangleSequence] RETURNS [newTwoCell: REF ThreeDBasics.ShapeInstance] ~ BEGIN

shapeOutStream: IO.STREAM;
shapeFileRope: Rope.ROPE;
tempFileName: Rope.ROPE ~ "[]<>Foo>TemporaryTwoCellFile";
tempFileOutStream: IO.STREAM;

shapeOutStream _ IO.ROS[];

IO.PutF[shapeOutStream, "TemporaryTwoCellFile\n"];
IO.PutF[shapeOutStream, "\nSurfaceType ~ ConvexPolygon, InsideVisible, CountFromOne\n"];
IO.PutF[shapeOutStream, "\nVertices ~ xyz: triple\n"];

FOR i: NAT IN [0..vertices.nVertices) DO
IO.PutF[
shapeOutStream,
"\t%g\t%g\t%g\n",
IO.real[vertices[i].x],
IO.real[vertices[i].y],
IO.real[vertices[i].z]];
ENDLOOP;

IO.PutF[shapeOutStream, "\nPolygons ~ index: integer vertices: nats\n"];
FOR i: NAT IN [0..triangles.nTriangles) DO
IO.PutF[
shapeOutStream,
"\t%g\t%g\t%g\t%g\n",
IO.int[3],
IO.int[triangles[i].firstVertex],
IO.int[triangles[i].secondVertex],
IO.int[triangles[i].thirdVertex]];
ENDLOOP;

shapeFileRope _ IO.RopeFromROS[shapeOutStream];
tempFileOutStream _ FS.StreamOpen[tempFileName, $create];
IO.PutF[tempFileOutStream, shapeFileRope];
IO.Close[tempFileOutStream];

newTwoCell _ SceneUtilities.NewShape[name];
IF triangles.nTriangles > 0 THEN
SceneUtilities.ReadShape[newTwoCell, tempFileName]; -- 9/22/86 - test put in for empty shapes

END;

AnotherMakeTwoCell: PROC [name: Rope.ROPE, vertices: REF CADTypes.VertexSequence, triangles: REF CADTypes.TriangleSequence] RETURNS [newTwoCell: REF ThreeDBasics.ShapeInstance] ~ BEGIN

min, max: Geometry3dVector.Triple;
nullVertex: ThreeDBasics.Vertex;
nullShade: ThreeDBasics.ShadingValue;
surface: REF ThreeDBasics.PtrPatchSequence;
newTwoCell _ SceneUtilities.NewShape[name];
newTwoCell.fileName _ "";
newTwoCell.numSurfaces _ triangles.nTriangles;
newTwoCell.insideVisible _ TRUE;

newTwoCell.vertex _ NEW[ThreeDBasics.VertexSequence[vertices.nVertices]];
newTwoCell.shade _ NEW[ThreeDBasics.ShadingSequence[vertices.nVertices]];
FOR i: NAT IN [0..vertices.nVertices) DO
newTwoCell.vertex[i] _ NEW[ThreeDBasics.Vertex _ nullVertex];
newTwoCell.shade[i] _ NEW[ ThreeDBasics.ShadingValue _ nullShade];
ENDLOOP;
ThreeDBasics.PutShading[newTwoCell, $Color, NEW[ImagerColor.RGB _ [0.2, 0.8, 0.8]]];

FOR i: NAT IN [0..vertices.nVertices) DO
newTwoCell.vertex[i].x _ vertices[i].x;
newTwoCell.vertex[i].y _ vertices[i].y;
newTwoCell.vertex[i].z _ vertices[i].z;
ENDLOOP;

newTwoCell.surface _ NEW[ThreeDBasics.PtrPatchSequence[triangles.nTriangles]];
surface _ NARROW[newTwoCell.surface, REF ThreeDBasics.PtrPatchSequence];
FOR i: NAT IN [0..triangles.nTriangles) DO
surface[i] _ NEW[ThreeDBasics.PtrPatch];
surface[i].vtxPtr _ NEW[ThreeDBasics.NatSequence[3]];
surface[i].vtxPtr.length _ 3;
surface[i].nVtces _ 3;
surface[i].type _ $ConvexPolygon;
surface[i].oneSided _ FALSE;
surface[i].vtxPtr[0] _ triangles[i].firstVertex;
surface[i].vtxPtr[1] _ triangles[i].secondVertex;
surface[i].vtxPtr[2] _ triangles[i].thirdVertex;
ENDLOOP;

min _ max _ [newTwoCell.vertex[0].x, newTwoCell.vertex[0].y, newTwoCell.vertex[0].z];
FOR i: NAT IN (0..newTwoCell.vertex.length) DO
IF newTwoCell.vertex[i] # NIL THEN BEGIN
IF newTwoCell.vertex[i].x < min.x 
THEN min.x _ newTwoCell.vertex[i].x 
ELSE IF newTwoCell.vertex[i].x > max.x THEN max.x _ newTwoCell.vertex[i].x;
IF newTwoCell.vertex[i].y < min.y 
THEN min.y _ newTwoCell.vertex[i].y 
ELSE IF newTwoCell.vertex[i].y > max.y THEN max.y _ newTwoCell.vertex[i].y;
IF newTwoCell.vertex[i].z < min.z 
THEN min.z _ newTwoCell.vertex[i].z 
ELSE IF newTwoCell.vertex[i].x > max.z THEN max.z _ newTwoCell.vertex[i].z;
END;
ENDLOOP;
newTwoCell.centroid.x _ (min.x + max.x) / 2; 
newTwoCell.centroid.y _ (min.y + max.y) / 2;  
newTwoCell.centroid.z _ (min.z + max.z) / 2; 
newTwoCell.boundingRadius _ 0.;
FOR i: NAT IN [0..newTwoCell.vertex.length) DO 
radius: REAL  _ RealFns.SqRt[ 
	  Sqr[newTwoCell.vertex[i].x - newTwoCell.centroid.x] 
+ Sqr[newTwoCell.vertex[i].y - newTwoCell.centroid.y]
+ Sqr[newTwoCell.vertex[i].z - newTwoCell.centroid.z] ];
IF radius > newTwoCell.boundingRadius 
THEN newTwoCell.boundingRadius _ radius;
ENDLOOP; 

newTwoCell _ SceneUtilities.NewShape[name];
SceneUtilities.ReadShape[newTwoCell, "[]<>Users>Rauen.pa>AlgebraicSurfaces>ChampagneGlass.shape"];

END;


Sqr: PROC [number: REAL] RETURNS [result: REAL] ~ BEGIN
result _ number * number;
END;

END.
ήThreeDHacksImpl.mesa
James Rauen, August 21, 1986 9:28:24 pm PDT

Note:  This is modeled after InitClasses in ThreeDWorld's StandardPatchProcs
I'm not sure yet what the validate proc is for, so it probably does the wrong thing now.

standardClass.validate _ StandardPatchProcs.ValidatePatchShape;
standardClass.validate _ StandardPatchProcs.ValidatePatchShape;
This procedure is called when ThreeDWorld wants to render the polygon comprising the FatPoint.

This procedure was inspired, in part, by Tilers.ConstantTiler

Parameters
patch: REF Patch is the lone triangular patch of the FatPoint.
PROC[ context: REF Context, patch: REF Patch, limitType: ATOM, limit: REAL, action: PROC[context: REF Context, patch: REF Patch] ];

Define the outline of the FatPoint.
Fill in the outline, colored black.
Get the screen coordinates of the first vertex in the patch, which will be the center of the FatPoint circle.
Get the imager context to draw in.
imagerContext: Imager.Context _ NARROW [Atom.GetPropFromList [context.display.props, $ImagerContext], Imager.Context];

This is BOGUS.  Fix it.
Get the screen coordinates of the first two vertices in the patch, which will be the endpoints of the section of the FatSeg being drawn.
Define the path the stroke will take.
Set the stroke parameters and draw it.
Get the imager context to draw in.
imagerContext: Imager.Context _ NARROW [Atom.GetPropFromList [context.display.props, $ImagerContext], Imager.Context];

Bail out if the patch is clipped.
This is BOGUS.  Fix it.
A FatPoint is, ideally, a single point located at position.  To force ThreeDWorld to call the drawing procedure, it is necessary to have FatPoints contain a polygonal patch.  So a FatPoint is composed of three vertices, the first one located at position and the others nearby, and one triangular patch defined by the three vertices.

Scratch variables.
Begin creating the newFatPoint.
newFatPoint.type _ $FatPoint;
What about its class?
Initialize the vertex and shade sequences.
Put in the coordinates of the vertices.
Build the patch.
Do the centroid and bounding radius.
Scratch variables.
Begin creating the newFatSeg. -- new version 9/22/86, for empty objects
There must be at least two points to make the FatSeg.
There must be at least two points to make the FatSeg. -- old version
Error: SIGNAL = CODE;
IF points.length < 2 THEN SIGNAL Error;
Begin creating the newFatSeg.
newFatSeg _ ThreeDScenes.NewShape[name];

newFatSeg.type _ $FatSeg;
What about its class?
Initialize the vertex and shade sequences.
Put in the coordinates of the vertices.
Build the patches.
Do the centroid and bounding radius.
Streams and other variables
Open a rope output stream to write the shape file to.
Write some keylines.
Write the vertices, ignoring the first one (it's garbage).
Write the polygons.
Close up the stream, get it as a rope, and write it to a temporary file.
Feed the file to ThreeDWorld constructors.
ThreeDSurfaces.ReadShape[newTwoCell, tempFileName]; -- old version
Scratch variables.

Begin creating the newTwoCell.
newTwoCell.type _ $ConvexPolygon;
What about its class?
Initialize the vertex and shade sequences.
Put in the coordinates of the vertices.
Build the patches.
Find approximation to the bounding sphere.  (Shamelessly stolen from ThreeDSurfacesImpl)
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