DIRECTORY
MathBox,
MathTypes USING [Style],
Imager USING [Context],
ImagerFont USING [Extents],
Vector USING [VEC, Sub],
Rope USING [ROPE, Find, Substr, Cat],
Convert USING [RopeFromAtom, AtomFromRope, CardFromRope, RopeFromCard],
MathRules;

MathRulesImpl: CEDAR PROGRAM 
IMPORTS MathBox, Vector, Convert, Rope
EXPORTS MathRules ~ 

BEGIN

VEC: TYPE ~ Vector.VEC;
ROPE: TYPE ~ Rope.ROPE;
BOX: TYPE ~ MathBox.BOX;
Style: TYPE ~ MathTypes.Style;

AtomBoxProc: TYPE ~ MathRules.AtomBoxProc;
AtomPaintProc: TYPE ~ MathRules.AtomPaintProc;
CompoundBoxProc: TYPE ~ MathRules.CompoundBoxProc;
CompositionProc: TYPE ~ MathRules.CompositionProc;

Alignment2D: TYPE ~ MathRules.Alignment2D;
Alignment: TYPE ~ MathRules.Alignment;
Offset: TYPE ~ MathRules.Offset;
TaggedOffset: TYPE ~ MathRules.TaggedOffset;

Size: TYPE ~ MathRules.Size;

smallGap: REAL = 0.05;
medGap: REAL = 0.1;
bigGap: REAL = 0.25;
matrixGap: REAL = 0.4;
AlignHorizontal: PUBLIC PROC[box1: ImagerFont.Extents, offset1: Offset, box2: BOX, offset2: Offset] RETURNS[REAL] ~ {
displacement1, displacement2: REAL _ 0.0;

SELECT offset1.wrt FROM
left => displacement1 _ offset1.pos;
right => displacement1 _ offset1.pos + 1.0;
bottom, top => ERROR; -- horizontal alignment with bottom or top is bogus
origin => displacement1 _ offset1.pos + 
(box1.leftExtent / (box1.leftExtent + box1.rightExtent));
center => displacement1 _ offset1.pos + 0.5;
ENDCASE => ERROR;

SELECT offset2.wrt FROM
left => displacement2 _ offset2.pos;
right => displacement2 _ offset2.pos + 1.0;
bottom, top => ERROR; -- horizontal alignment with bottom or top is bogus
origin => displacement2 _ offset2.pos + 
(box2.Extents[].leftExtent / box2.Width[]);
center => displacement2 _ offset2.pos + 0.5;
ENDCASE => ERROR;

RETURN[MathBox.AlignHorizontal[box1, displacement1, box2, displacement2]];
};

AlignVertical: PUBLIC PROC[box1: ImagerFont.Extents, offset1: Offset, box2: BOX, offset2: Offset] RETURNS[REAL] ~ {
displacement1, displacement2: REAL;

SELECT offset1.wrt FROM
bottom => displacement1 _ offset1.pos;
top => displacement1 _ offset1.pos + 1.0;
left, right => ERROR; -- vertical alignment with left or right is bogus
origin => displacement1 _ offset1.pos + 
(box1.descent / (box1.descent + box1.ascent));
center => displacement1 _ offset1.pos + 0.5;
ENDCASE => ERROR;

SELECT offset2.wrt FROM
bottom => displacement2 _ offset2.pos;
top => displacement2 _ offset2.pos + 1.0;
left, right => ERROR; -- vertical alignment with left or right is bogus
origin => displacement2 _ offset2.pos + 
(box2.Extents[].descent / box2.Height[]);
center => displacement2 _ offset2.pos + 0.5;
ENDCASE => ERROR;

RETURN[MathBox.AlignVertical[box1, displacement1, box2, displacement2]];
};


Compose: PUBLIC PROC[boxes: LIST OF BOX, alignments: LIST OF Alignment2D, hOrigin, vOrigin: TaggedOffset] RETURNS[BOX, LIST OF BOX] ~ {
relBoxes: LIST OF BOX _ NIL;  -- cons up return values; relative units
myBox, myRelBox: BOX;  -- box which encloses entire expression
myExtents: ImagerFont.Extents;
tempBox, attachHRelBox, attachVRelBox: BOX;
farLeft, farRight, farUp, farDown: REAL _ 0.0;
scaleVec, originOffset: VEC _ [0.0, 0.0];
dummyPtExtents: ImagerFont.Extents _ [leftExtent: 0.0, rightExtent: 0.001, descent: 0.0, ascent: 0.001];  -- null-sized extents used for alignment purposes


LocalScale: PROC[b: BOX] RETURNS[BOX] ~ {
scaledBox: BOX _ MathBox.Scale[b, scaleVec];
RETURN[MathBox.ChangeType[scaledBox, relative]];
};

LocalFixOffset: PROC[b: BOX] RETURNS[BOX] ~ {
RETURN[MathBox.ChangeOffset[b, Vector.Sub[b.Offset[], originOffset]]];
};


IF alignments = NIL THEN ERROR unable[$noAlignments];


tempBox _ MathBox.GetBox[alignments.first.hAttach.tag, boxes];
relBoxes _ CONS[MathBox.ChangeOffset[tempBox, [0.0, 0.0]], relBoxes];

FOR l: LIST OF Alignment2D _ alignments, l.rest UNTIL l = NIL DO
tempBox _ MathBox.GetBox[l.first.tag, boxes];
attachHRelBox _ MathBox.GetBox[l.first.hAttach.tag, relBoxes];
attachVRelBox _ MathBox.GetBox[l.first.vAttach.tag, relBoxes];
relBoxes _ CONS[MathBox.ChangeOffset[tempBox, [AlignHorizontal[tempBox.Extents[], l.first.hAttach.offset1, attachHRelBox, l.first.hAttach.offset2], AlignVertical[tempBox.Extents[], l.first.vAttach.offset1, attachVRelBox, l.first.vAttach.offset2]]], relBoxes];
ENDLOOP;

FOR l: LIST OF BOX _ relBoxes, l.rest UNTIL l = NIL DO
farLeft _ MIN[farLeft, l.first.Offset[].x - l.first.Extents[].leftExtent];
farRight _ MAX[farRight, l.first.Offset[].x + l.first.Extents[].rightExtent];
farDown _ MIN[farDown, l.first.Offset[].y - l.first.Extents[].descent];
farUp _ MAX[farUp, l.first.Offset[].y + l.first.Extents[].ascent];
ENDLOOP;


myBox _ MathBox.MakeBox[$composeMyBox, NIL, other, absolute, [leftExtent: -farLeft, rightExtent: farRight, descent: -farDown, ascent: farUp]];

scaleVec _ [1 / myBox.Width[], 1/ myBox.Height[]];
relBoxes _ MathBox.MapBoxList[relBoxes, LocalScale];
myRelBox _ MathBox.Scale[myBox, scaleVec];

IF hOrigin.tag = $self THEN {
attachHRelBox _ myRelBox;
}
ELSE {
attachHRelBox _ MathBox.GetBox[hOrigin.tag, relBoxes];
};
IF vOrigin.tag = $self THEN {
attachVRelBox _ myRelBox;
}
ELSE {
attachVRelBox _ MathBox.GetBox[vOrigin.tag, relBoxes];
};

originOffset _ [
AlignHorizontal[dummyPtExtents, [origin], attachHRelBox, hOrigin.offset],
AlignVertical[dummyPtExtents, [origin], attachVRelBox, vOrigin.offset]
];

relBoxes _ MathBox.MapBoxList[relBoxes, LocalFixOffset];

myExtents _ myRelBox.Extents[];
myRelBox _ MathBox.ChangeExtents[myRelBox, [leftExtent: myExtents.leftExtent + originOffset.x, rightExtent: myExtents.rightExtent - originOffset.x, descent: myExtents.descent + originOffset.y, ascent: myExtents.ascent - originOffset.y]];

myBox _ MathBox.Scale[myRelBox, [myBox.Width[], myBox.Height[]]];

RETURN[myBox, relBoxes];
};

AtomFromRowCol: PUBLIC PROC[row, col: NAT] RETURNS[ATOM] ~ {
rowRope: ROPE _ Convert.RopeFromCard[row];
colRope: ROPE _ Convert.RopeFromCard[col];
RETURN[Convert.AtomFromRope[Rope.Cat["r", rowRope, "c", colRope]]];
};

RowColFromAtom: PUBLIC PROC[rc: ATOM] RETURNS[NAT, NAT] ~ {
rcRope: ROPE _ Convert.RopeFromAtom[from: rc, quote: FALSE];
rPos: INT _ Rope.Find[rcRope, "r"];
cPos: INT _ Rope.Find[rcRope, "c"];
row, col: NAT _ 0;

IF (cPos = -1) OR (rPos = -1) OR (cPos < rPos) THEN ERROR badFormat;
row _ Convert.CardFromRope[Rope.Substr[rcRope, rPos+1, (cPos - (rPos+1))]];
col _ Convert.CardFromRope[Rope.Substr[rcRope, cPos+1]];

RETURN[row, col];
};


ComposeMatrix: PUBLIC PROC[nRows, nCols: NAT, boxes: LIST OF BOX, spaceBox, openSymBox, closeSymBox: BOX] RETURNS[BOX, LIST OF BOX, BOX, BOX] ~ {
NatSeq: TYPE ~ REF NatSeqRec;
NatSeqRec: TYPE ~ RECORD[
elements: SEQUENCE size: NAT OF NAT
];

Element: TYPE ~ RECORD [
box: BOX _ NIL
];

Row: TYPE ~ REF RowRec;
RowRec: TYPE ~ RECORD [
elements: SEQUENCE numberOfCols: NAT OF Element
];

Matrix: TYPE ~ REF MatrixRec;
MatrixRec: TYPE ~ RECORD[
rows: SEQUENCE numberOfRows: NAT OF Row
];


tallest: NatSeq _ NEW[NatSeqRec[nRows]];
widest: NatSeq _ NEW[NatSeqRec[nCols]];
a: Matrix;
myBox, myRelBox: BOX;
relBoxes: LIST OF BOX _ NIL;
maxHeight, maxWidth, scaleFactor, yOffset: REAL _ 0.0;
currentRow, currentCol: NAT _ 0;
tempElt: Element;
farLeft, farRight, farUp, farDown: REAL _ 0.0;
scaleVec, originOffset: VEC _ [0.0, 0.0];
myExtents: ImagerFont.Extents;
closeBox, openBox: BOX;

horizSpace: BOX _ spaceBox;  -- inter-column spacing
vertSpace: BOX _ spaceBox;  -- inter-row spacing

a _ NEW[MatrixRec[nRows]];
FOR row: NAT IN [0..nRows) DO
a[row] _ NEW[RowRec[nCols]];
ENDLOOP;

FOR elements: LIST OF BOX _ boxes, elements.rest UNTIL elements = NIL DO
[currentRow, currentCol] _ RowColFromAtom[elements.first.Tag[]];
a[currentRow - 1][currentCol - 1].box _ elements.first;
ENDLOOP;


FOR r:NAT IN [0..nRows) DO
tallest[r] _ 0;
maxHeight _ 0.0;
FOR c:NAT IN [0..nCols) DO
IF a[r][c].box = NIL THEN ERROR unable[$missingElement];  -- missing r,c element
IF a[r][c].box.Height[] > maxHeight THEN {
tallest[r] _ c;
maxHeight _ a[r][c].box.Height[];
};
ENDLOOP;
ENDLOOP; 

FOR c:NAT IN [0..nCols) DO
widest[c] _ 0;
maxWidth _ 0.0;
FOR r:NAT IN [0..nRows) DO
IF a[r][c].box.Width[] > maxWidth THEN {
widest[c] _ r;
maxWidth _ a[r][c].box.Width[];
};
ENDLOOP;
ENDLOOP;

a[0][tallest[0]].box _ MathBox.ChangeOffset[a[0][tallest[0]].box, [0.0, 0.0]];  -- set vOrigin
FOR r:NAT IN [1..nRows) DO
tempElt _ a[r][tallest[r]];  -- just shorthand
vertSpace _ MathBox.ChangeOffset[vertSpace, [0.0, AlignVertical[vertSpace.Extents[], [top], a[r-1][tallest[r-1]].box, [bottom]]]];
a[r][tallest[r]].box _ MathBox.ChangeOffset[tempElt.box, [0.0, AlignVertical[tempElt.box.Extents[], [top], vertSpace, [bottom]]]];
ENDLOOP;

FOR r:NAT IN [0..nRows) DO
FOR c:NAT IN [0..nCols) DO
IF c # tallest[r] THEN
a[r][c].box _ MathBox.ChangeOffset[a[r][c].box, [0.0, AlignVertical[a[r][c].box.Extents[], [origin], a[r][tallest[r]].box, [origin]]]];
ENDLOOP;
ENDLOOP; 

a[widest[0]][0].box _ MathBox.ChangeOffset[a[widest[0]][0].box, [0.0, a[widest[0]][0].box.Offset[].y]];  -- set horizontal origin
FOR c:NAT IN [1..nCols) DO
tempElt _ a[widest[c]][c];  -- just shorthand
horizSpace _ MathBox.ChangeOffset[horizSpace, [AlignHorizontal[horizSpace.Extents[], [left], a[widest[c-1]][c-1].box, [right]], 0.0]];  -- punt vertical offset
a[widest[c]][c].box _ MathBox.ChangeOffset[tempElt.box, [AlignHorizontal[tempElt.box.Extents[], [left], horizSpace, [right]], tempElt.box.Offset[].y]];
ENDLOOP;

FOR c:NAT IN [0..nCols) DO
FOR r:NAT IN [0..nRows) DO
IF r # widest[c] THEN 
a[r][c].box _ MathBox.ChangeOffset[a[r][c].box, [AlignHorizontal[a[r][c].box.Extents[], [center], a[widest[c]][c].box, [center]], a[r][c].box.Offset[].y]];
ENDLOOP;
ENDLOOP;

FOR r:NAT IN [0..nRows) DO
FOR c:NAT IN [0..nCols) DO
farLeft _ MIN[farLeft, a[r][c].box.Offset[].x - a[r][c].box.Extents[].leftExtent];
farRight _ MAX[farRight, a[r][c].box.Offset[].x + a[r][c].box.Extents[].rightExtent];
farDown _ MIN[farDown, a[r][c].box.Offset[].y - a[r][c].box.Extents[].descent];
farUp _ MAX[farUp, a[r][c].box.Offset[].y + a[r][c].box.Extents[].ascent];
ENDLOOP;
ENDLOOP;

myBox _ MathBox.MakeBox[$composeMatrixBox, NIL, other, absolute, [leftExtent: -farLeft, rightExtent: farRight, descent: -farDown, ascent: farUp]];
scaleFactor _ MAX[0.25, ((1 + medGap) * (-farDown + farUp)) / openSymBox.Height[]];
openBox _ MathBox.Scale[openSymBox, [scaleFactor, scaleFactor]];
scaleFactor _ MAX[0.25, ((1 + medGap) * (-farDown + farUp)) / closeSymBox.Height[]];
closeBox _ MathBox.Scale[closeSymBox, [scaleFactor, scaleFactor]];

openBox _ MathBox.ChangeOffset[openBox, [
AlignHorizontal[openBox.Extents[], [right, medGap], myBox, [left]],
AlignVertical[openBox.Extents[], [center], myBox, [center]]]];

closeBox _ MathBox.ChangeOffset[closeBox, [
AlignHorizontal[closeBox.Extents[], [left, -medGap], myBox, [right]],
AlignVertical[closeBox.Extents[], [center], myBox, [center]]]];

farLeft _ openBox.Offset[].x - openBox.Extents[].leftExtent;
farRight _ closeBox.Offset[].x + closeBox.Extents[].rightExtent;
farUp _ openBox.Offset[].y + openBox.Extents[].ascent;
farDown _ openBox.Offset[].y - openBox.Extents[].descent;

myBox _ MathBox.MakeBox[$composeMatrixBox, NIL, other, absolute, [leftExtent: -farLeft, rightExtent: farRight, descent: -farDown, ascent: farUp]];

scaleVec _ [1 / myBox.Width[], 1/ myBox.Height[]];

FOR r:NAT IN [0..nRows) DO
FOR c:NAT IN [0..nCols) DO
scaledBox: BOX _ MathBox.Scale[a[r][c].box, scaleVec];
a[r][c].box _ MathBox.ChangeType[scaledBox, relative];
ENDLOOP;
ENDLOOP;

myRelBox _ MathBox.Scale[myBox, scaleVec];
openBox _ MathBox.Scale[openBox, scaleVec];
openBox _ MathBox.ChangeType[openBox, relative];
closeBox _ MathBox.Scale[closeBox, scaleVec];
closeBox _ MathBox.ChangeType[closeBox, relative];

yOffset _ AlignVertical[[leftExtent: 0.0, rightExtent: 0.1, descent: 0.0, ascent: 0.1], [origin], openBox, [center]];
originOffset _ [0.0, yOffset]; 

FOR r:NAT IN [0..nRows) DO
FOR c:NAT IN [0..nCols) DO
a[r][c].box _ MathBox.ChangeOffset[a[r][c].box, Vector.Sub[a[r][c].box.Offset[], originOffset]];
ENDLOOP;
ENDLOOP;
openBox _ MathBox.ChangeOffset[openBox, Vector.Sub[openBox.Offset[], originOffset]];
closeBox _ MathBox.ChangeOffset[closeBox, Vector.Sub[closeBox.Offset[], originOffset]];

myExtents _ myRelBox.Extents[];
myRelBox _ MathBox.ChangeExtents[myRelBox, [leftExtent: myExtents.leftExtent + originOffset.x, rightExtent: myExtents.rightExtent - originOffset.x, descent: myExtents.descent + originOffset.y, ascent: myExtents.ascent - originOffset.y]];

myBox _ MathBox.Scale[myRelBox, [myBox.Width[], myBox.Height[]]];


relBoxes _ NIL;  -- cons up new list from matrix a
FOR r: NAT DECREASING IN [0..nRows) DO
FOR c: NAT DECREASING IN [0..nCols) DO
relBoxes _ CONS[a[r][c].box, relBoxes];
ENDLOOP;
ENDLOOP;

RETURN[myBox, relBoxes, openBox, closeBox]; 
};





ComputeSize: PUBLIC PROC[base, adjustment: Size] RETURNS[Size] ~ {
SELECT base FROM
normal => RETURN[adjustment];
script => {
SELECT adjustment FROM
normal => RETURN[script];
script, scriptscript => RETURN[scriptscript];
big => RETURN[normal];
ENDCASE => ERROR;
};
scriptscript => {
SELECT adjustment FROM
normal, script, scriptscript => RETURN[scriptscript];
big => RETURN[script];
ENDCASE => ERROR;
};
big => {
SELECT adjustment FROM
normal, big => RETURN[big];
script => RETURN[normal];
scriptscript => RETURN[script];
ENDCASE => ERROR;
};
ENDCASE => ERROR;
};

VecFromSize: PUBLIC PROC[size: Size] RETURNS[VEC] ~ {
SELECT size FROM
normal => RETURN[[1.0, 1.0]];
script => RETURN[[0.6, 0.6]];
scriptscript => RETURN[[0.36, 0.36]];
big => RETURN[[1.5, 1.5]];
ENDCASE => ERROR;
};


unable: PUBLIC ERROR[reason: ATOM] = CODE;
badFormat: PUBLIC ERROR = CODE;



END.
RMathRulesImpl.mesa
Carl Waldspurger, August 30, 1986 4:35:33 pm PDT
Imported Type Abbreviations
Constants
Alignment Operations
effects:  Horizontally aligns box1 with box2 using specified offsets.
          Returns x offset for box1.

effects:  Vertically aligns box1 with box2 using specified offsets.
          Returns y offset for box1.
Automated Layout Composition
effects:  Performs the layout composition for boxes using alignments.
          Returns information expected from a CompositionProc.

local declarations
should really ENABLE boxNotFound => ERROR unable
local procedures
n.b. input boxes are in absolute units (boxes), output boxes are in relative units (relBoxes)
but we are still working in real absolute units here
get first referenced box & save it as the initial (temporary) origin
dsa - get the first box that we say we want to align with respect to, and make its lower left hand corner the origin of absolute coordinates
compute offset locations in absolute (n.b. not relative) units
align tempBox to attach H&V boxes and save it
find extreme edge points to determine myBox size
set myBox dimensions in REAL units
dsa - note that since we made the lower left hand corner of tempbox the origin of absolute coordinates above, farLeft <= 0.0 and farDown<= 0.0, hence all extents above will get set to nonnegative values. 
dsa - note that we accept the default offset of [0.0, 0.0]
scale the absolute boxes => relative boxes (extents & offsets)
dsa - the scaling of offsets that MathBox.Scale will do is ok since the offsets of all the relBoxes have been changed to be with respect to our new origin of coordinates, and that myRelBox has offset of [0.0, 0.0] 
dsa - n.b. myRelBox is an absolute box
compute relative origin location
dsa - why do we do this?
dsa - presumably the new origin will be somewhere inside myRelBox?
adjust all relative box offsets by originOffset
adjust myRelBox w.r.t new origin
effects:  Returns the atom $r{row}c{col}

requires:  rc is of the form $r#c#
effects:  Returns the row and column indexes associated with $r#c#
          SIGNALS badFormat if rc does not conform to the format $r#c#
          
local declarations
effects:  Performs the layout composition for a generalized matrix.
          Returns information expected by Format, preserving input row&col orderings.

type declarations

local declatations

convert boxes into a SEQUENCE (ugh!) matrix type
instantiate matrix "a"  (isn't CLU's array[]$create() much nicer, really?)
mark tallest elt in each row
mark widest elt in each row
vertically align tallest elts, row by row
align a vertical space between each row
vertically align all other (shorter) elts row by row
horizontally align widest elts, col by col
align a horizSpace between each column
horizontally align all other (narrower) elts col by col
now find extreme edge points to determine myBox size
preliminary "myBox" for aligning open and close symbols

magnify (don't allow too much shrinkage - using hardcoded #s here is a kludge,
but I have a plane to catch...) openSymBox and closeSymBox boxes (absolute boxes)
align openBox and closeBox

align using myBox info
recompute extreme points
scale the absolute boxes => relative boxes (extents & offsets)
compute relative origin location
let origin be thru center; find center using dummy alignment extents
adjust all relative boxes by origin offset amount
adjust myRelBox w.r.t new origin
reconstruct LIST OF BOX for return value (from MATRIX sequence structure)
Size Operations
effects:  Returns the size of adjustment applied to base.

effects:  Returns scaling vector corresponding to size (e.g. normal = unit vec)

Signals & Errors
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