GGOutlineImplA.mesa
Copyright © 1986 by Xerox Corporation. All rights reserved.
Last edited by Bier on June 2, 1986 5:10:01 pm PDT
Contents: Procedures to implement the Outline Slice Class in Gargoyle. Outlines consist of Trajectories which in turn consist of Segments. Outline is the most important slice class.
DIRECTORY
AtomButtonsTypes, Feedback, GGBasicTypes, GGBoundBox, GGInterfaceTypes, GGModelTypes, GGScene, GGOutline, GGParseIn, GGParseOut, GGSegmentTypes, GGSelect, GGSequence, GGShapes, GGTraj, GGUtility, Imager, ImagerColor, ImagerPath, ImagerTransformation, IO, Rope, Vectors2d, ViewerClasses;
GGOutlineImplA: CEDAR PROGRAM
IMPORTS Feedback, GGBoundBox, GGScene, GGOutline, GGParseIn, GGParseOut, GGSequence, GGShapes, GGTraj, GGUtility, Imager, ImagerColor, ImagerPath, ImagerTransformation, IO, Vectors2d
EXPORTS GGOutline = BEGIN
OPEN GGOutline;
BitVector: TYPE = GGBasicTypes.BitVector;
BoundBox: TYPE = GGBasicTypes.BoundBox;
CameraData: TYPE = GGModelTypes.CameraData;
Circle: TYPE = GGBasicTypes.Circle;
Color: TYPE = Imager.Color;
DefaultData: TYPE = GGModelTypes.DefaultData;
FeedbackData: TYPE = AtomButtonsTypes.FeedbackData;
StrokeJoint: TYPE = Imager.StrokeJoint;
StrokeEnd: TYPE = Imager.StrokeEnd;
ControlPointGenerator: TYPE = GGModelTypes.ControlPointGenerator;
FeatureData: TYPE = GGInterfaceTypes.FeatureData;
GGData: TYPE = GGInterfaceTypes.GGData;
Joint: TYPE = GGSegmentTypes.Joint;
JointGenerator: TYPE = GGModelTypes.JointGenerator;
Line: TYPE = GGBasicTypes.Line;
AlignBag: TYPE = GGInterfaceTypes.AlignBag;
Outline: TYPE = REF OutlineObj;
OutlineObj: TYPE = GGModelTypes.OutlineObj;
OutlineData: TYPE = REF OutlineDataObj;
OutlineDataObj: TYPE = GGOutline.OutlineDataObj;
OutlineClass: TYPE = REF OutlineClassObj;
OutlineClassObj: TYPE = GGModelTypes.OutlineClassObj;
OutlineDescriptor: TYPE = GGModelTypes.OutlineDescriptor;
OutlineHitData: TYPE = REF OutlineHitDataObj;
OutlineHitDataObj: TYPE = GGOutline.OutlineHitDataObj;
OutlineParts: TYPE = REF OutlinePartsObj;
OutlinePartsObj: TYPE = GGOutline.OutlinePartsObj;
OutlineSequence: TYPE = GGSelect.OutlineSequence;
OutlineSequenceGenerator: TYPE = GGSelect.OutlineSequenceGenerator;
Point: TYPE = GGBasicTypes.Point;
PointGenerator: TYPE = GGModelTypes.PointGenerator;
PointPairGenerator: TYPE = GGModelTypes.PointPairGenerator;
Scene: TYPE = GGModelTypes.Scene;
Segment: TYPE = GGSegmentTypes.Segment;
SegmentGenerator: TYPE = GGModelTypes.SegmentGenerator;
SelectMode: TYPE = GGModelTypes.SelectMode;
SelectionClass: TYPE = GGSegmentTypes.SelectionClass;
Sequence: TYPE = GGModelTypes.Sequence;
SequenceOfReal: TYPE = GGBasicTypes.SequenceOfReal;
SliceClass: TYPE = REF SliceClassObj;
SliceClassObj: TYPE = GGModelTypes.SliceClassObj;
SliceDescriptor: TYPE = GGModelTypes.SliceDescriptor;
SliceParts: TYPE = GGModelTypes.SliceParts;
Traj: TYPE = REF TrajObj;
TrajEnd: TYPE = GGModelTypes.TrajEnd;
TrajGenerator: TYPE = REF TrajGeneratorObj;
TrajGeneratorObj: TYPE = GGModelTypes.TrajGeneratorObj;
TrajObj: TYPE = GGModelTypes.TrajObj;
TrajPartType: TYPE = GGModelTypes.TrajPartType;
TriggerBag: TYPE = GGInterfaceTypes.TriggerBag;
Vector: TYPE = GGBasicTypes.Vector;
Viewer: TYPE = ViewerClasses.Viewer;
OutlineDescribeProc: TYPE = GGModelTypes.OutlineDescribeProc;
OutlineFileoutProc: TYPE = GGModelTypes.OutlineFileoutProc;
OutlineFileinProc: TYPE = GGModelTypes.OutlineFileinProc;
OutlineUnionPartsProc: TYPE = GGModelTypes.OutlineUnionPartsProc;
OutlineDifferencePartsProc: TYPE = GGModelTypes.OutlineDifferencePartsProc;
OutlineAugmentPartsProc: TYPE = GGModelTypes.OutlineAugmentPartsProc;
OutlinePointsInDescriptorProc: TYPE = GGModelTypes.OutlinePointsInDescriptorProc;
OutlinePointPairsInDescriptorProc: TYPE = GGModelTypes.OutlinePointPairsInDescriptorProc;
OutlineNextPointProc: TYPE = GGModelTypes.OutlineNextPointProc;
OutlineNextPointPairProc: TYPE = GGModelTypes.OutlineNextPointPairProc;
OutlineClosestPointProc: TYPE = GGModelTypes.OutlineClosestPointProc;
OutlineClosestPointAndTangentProc: TYPE = GGModelTypes.OutlineClosestPointAndTangentProc;
OutlineClosestSegmentProc: TYPE = GGModelTypes.OutlineClosestSegmentProc;
OutlineSetArrowsProc: TYPE = GGModelTypes.OutlineSetArrowsProc;
OutlineGetArrowsProc: TYPE = GGModelTypes.OutlineGetArrowsProc;
Problem: PUBLIC SIGNAL [msg: Rope.ROPE] = Feedback.Problem;
fillColor: PUBLIC Imager.Color ← Imager.MakeGray[0.5];
The Outline Class
BuildOutlineSliceClass: PUBLIC PROC [] RETURNS [class: OutlineClass] = {
class ← NEW[OutlineClassObj ← [
type: $Outline,
Fundamentals
getBoundBox: OutlineBoundBox,
getTightBox: OutlineTightBox,
copy: OutlineCopy,
Drawing
drawParts: OutlineDrawParts,
drawTransform: OutlineDrawTransform,
drawSelectionFeedback: OutlineDrawSelectionFeedback,
drawAttractorFeedback: OutlineDrawAttractorFeedback,
Transforming
transform: OutlineTransform,
Textual Description
describe: OutlineDescribe,
describeHit: OutlineDescribeHit,
fileout: OutlineFileout,
filein: OutlineFilein,
Parts
emptyParts: OutlineEmptyParts,
newParts: OutlineNewParts,
unionParts: OutlineUnionParts,
differenceParts: OutlineDifferenceParts,
movingParts: OutlineMovingParts,
augmentParts: OutlineAugmentParts,
setSelectedFields: OutlineSetSelectedFields,
Part Generators
pointsInDescriptor: OutlinePointsInDescriptor,
pointPairsInDescriptor: OutlinePointPairsInDescriptor,
nextPoint: OutlineNextPoint,
nextPointPair: OutlineNextPointPair,
Hit Testing
closestPoint: OutlineClosestPoint,
closestJointToHitData: OutlineClosestJointToHitData,
closestPointAndTangent: NoOpClosestPointAndTangent,
closestSegment: OutlineClosestSegment,
lineIntersection: OutlineLineIntersection,
circleIntersection: OutlineCircleIntersection,
hitDataAsSimpleCurve: OutlineHitDataAsSimpleCurve,
Style
setDefaults: OutlineSetDefaults,
setStrokeWidth: OutlineSetStrokeWidth,
getStrokeWidth: OutlineGetStrokeWidth,
setStrokeEnd: OutlineSetStrokeEnd,
getStrokeEnd: OutlineGetStrokeEnd,
setStrokeJoint: OutlineSetStrokeJoint,
getStrokeJoint: OutlineGetStrokeJoint,
setStrokeColor: OutlineSetStrokeColor,
getStrokeColor: OutlineGetStrokeColor,
setFillColor: OutlineSetFillColor,
getFillColor: OutlineGetFillColor,
setArrows: NoOpSetArrows,
getArrows: NoOpGetArrows,
setDashed: OutlineSetDashed,
getDashed: OutlineGetDashed
]];
};
FetchSliceClass: PUBLIC PROC [name: ATOM] RETURNS [class: OutlineClass] = {
class ← globalOutlineClass;
};
FetchOutlineClass: PROC [] RETURNS [class: OutlineClass] = {
class ← globalOutlineClass;
};
CreateOutline: PUBLIC PROC [traj: Traj, fillColor: Color] RETURNS [outline: Outline] = {
boundBox: BoundBox ← GGBoundBox.CopyBoundBox[traj.boundBox];
data: OutlineData ← NEW[OutlineDataObj ← [fillColor: fillColor, children: LIST[traj]] ];
outline ← NEW[OutlineObj ← [
class: GGSlice.FetchSliceClass[$Outline],
data: data,
selectedInFull: [FALSE, FALSE, FALSE],
boundBox: boundBox]];
outline.nullDescriptor ← GGSlice.DescriptorFromParts[outline, CreateEmptyParts[outline]];
traj.parent ← outline;
IF traj.role = hole THEN traj.role ← fence;
};
Fundamentals
OutlineBoundBox: PROC [slice: Outline, parts: SliceParts] RETURNS [box: BoundBox] = {
IF parts = NIL THEN box ← slice.boundBox
ELSE {
outlineParts: OutlineParts ← NARROW[parts];
boxList: LIST OF BoundBox ← NIL;
thisBox: BoundBox;
FOR list: LIST OF Sequence ← outlineParts.seqs, list.rest UNTIL list = NIL DO
IF list.first # NIL THEN {
thisBox ← GGSequence.ComputeBoundBox[list.first];
boxList ← CONS[thisBox, boxList];
};
ENDLOOP;
box ← GGBoundBox.BoundBoxOfBoxes[boxList];
};
};
OutlineTightBox: PROC [slice: Outline, parts: SliceParts] RETURNS [box: BoundBox] = {
outlineParts: OutlineParts;
boxList: LIST OF BoundBox ← NIL;
thisBox: BoundBox;
IF parts = NIL THEN parts ← slice.class.newParts[slice, NIL, slice].parts;
outlineParts ← NARROW[parts];
FOR list: LIST OF Sequence ← outlineParts.seqs, list.rest UNTIL list = NIL DO
IF list.first # NIL THEN {
thisBox ← GGSequence.ComputeTightBox[list.first];
boxList ← CONS[thisBox, boxList];
};
ENDLOOP;
box ← GGBoundBox.BoundBoxOfBoxes[boxList];
};
UpdateBoundBox: PUBLIC PROC [slice: Outline] = {
Computes it from traj boxes.
outlineBoxes: LIST OF BoundBox ← NIL;
trajGen: TrajGenerator;
IF slice=NIL THEN RETURN;
trajGen ← TrajsInOutline[slice];
FOR traj: Traj ← GGScene.NextTraj[trajGen], GGScene.NextTraj[trajGen] UNTIL traj = NIL DO
outlineBoxes ← CONS[traj.boundBox, outlineBoxes];
ENDLOOP;
UpdateBoundBoxFromList[slice.boundBox, outlineBoxes];
};
UpdateBoundBoxFromList: PROC [bBox: BoundBox, list: LIST OF BoundBox] = {
IF list = NIL THEN ERROR;
bBox.loX ← list.first.loX;
bBox.hiX ← list.first.hiX;
bBox.loY ← list.first.loY;
bBox.hiY ← list.first.hiY;
FOR bBoxList: LIST OF BoundBox ← list.rest, bBoxList.rest UNTIL bBoxList = NIL DO
bBox.loX ← MIN[bBox.loX, bBoxList.first.loX];
bBox.hiX ← MAX[bBox.hiX, bBoxList.first.hiX];
bBox.loY ← MIN[bBox.loY, bBoxList.first.loY];
bBox.hiY ← MAX[bBox.hiY, bBoxList.first.hiY];
ENDLOOP;
};
OutlineCopy: PROC [slice: Outline] RETURNS [copy: Outline] = {
holeGen: TrajGenerator;
newTraj, fence: Traj;
fence ← GGOutline.FenceOfOutline[slice];
newTraj ← GGTraj.CopyTraj[fence];
copy ← CreateOutline[newTraj, slice.fillColor];
holeGen ← GGOutline.HolesOfOutline[slice];
FOR hole: Traj ← GGScene.NextTraj[holeGen], GGScene.NextTraj[holeGen] UNTIL hole = NIL DO
newTraj ← GGTraj.CopyTraj[hole];
copy.children ← AppendTrajList[copy.children, LIST[newTraj]];
newTraj.parent ← copy;
ENDLOOP;
};
Drawing
OutlineDrawParts: PROC [slice: Outline, parts: SliceParts, dc: Imager.Context, camera: CameraData, quick: BOOL] = {
GGModelTypes.OutlineDrawPartsProc
IF parts # NIL THEN ERROR Problem[msg: "OutlineDrawParts NYI"];
sliceD: SliceDescriptor ← GGSlice.DescriptorFromParts[slice, parts];
IF slice.class.isComplete[sliceD] THEN DrawOutline[dc, slice]
ELSE {
seqList: LIST OF Sequence ← GGOutline.SequencesOfOutline[slice]; -- why not sequenceGen??
FOR seq: Sequence ← seqList, seq.rest UNTIL seq=NIL DO
GGTraj.DrawTrajSeq[seq.first];
ENDLOOP;
};
};
OutlineDrawTransform: PROC [sliceD: OutlineDescriptor, dc: Imager.Context, camera: CameraData, transform: ImagerTransformation.Transformation] = {
sliceParts: OutlineParts ← NARROW[sliceD.parts];
BuildOutline: Imager.PathProc = {
PathProc: TYPE ~ PROC[moveTo: MoveToProc, lineTo: LineToProc,
curveTo: CurveToProc, conicTo: ConicToProc, arcTo: ArcToProc];
BuildPath: Imager.PathProc = {
seg: Segment;
firstPoint: Point ← GGTraj.FetchJointPos[traj, 0];
moveTo[ [firstPoint.x, firstPoint.y] ];
FOR i: INT IN [0..GGTraj.HiSegment[traj]] DO
seg ← GGTraj.FetchSegment[traj, i];
seg.class.buildPath[seg, lineTo, curveTo, conicTo, arcTo];
ENDLOOP;
};
BuildPathTransformSeq: Imager.PathProc = {
seg: Segment;
firstPoint: Point ← GGTraj.FetchJointPos[traj, 0];
IF thisSeq.segments[0] OR thisSeq.joints[0] THEN firstPoint ← ImagerTransformation.Transform[transform, firstPoint];
moveTo[ [firstPoint.x, firstPoint.y] ];
FOR i: INT IN [0..GGTraj.HiSegment[traj]] DO
seg ← GGTraj.FetchSegment[traj, i];
seg.class.buildPathTransform[seg, transform, thisSeq.segments[i], thisSeq.joints[i], thisSeq.joints[(i+1) MOD thisSeq.traj.segCount], thisSeq.controlPoints[i], lineTo, curveTo, conicTo, arcTo];
ENDLOOP;
};
imagerHole: ImagerPath.Trajectory;
cc, holeCC: BOOL;
traj ← fence;
thisSeq ← FindSequenceInList[traj, sliceParts.seqs];
IF thisSeq # NIL THEN {
BuildPathTransformSeq[moveTo, lineTo, curveTo, conicTo, arcTo];
cc ← GGTraj.IsClockwiseTrajTransformSeq[thisSeq, transform];
}
ELSE {
BuildPath[moveTo, lineTo, curveTo, conicTo, arcTo];
cc ← GGTraj.IsClockwiseTraj[traj];
};
FOR holeList: LIST OF Traj ← slice.children.rest, holeList.rest UNTIL holeList = NIL DO
traj ← holeList.first;
thisSeq ← FindSequenceInList[traj, sliceParts.seqs];
IF thisSeq # NIL THEN {
imagerHole ← ImagerPath.TrajectoryListFromPath[BuildPathTransformSeq].first;
holeCC ← GGTraj.IsClockwiseTrajTransformSeq[thisSeq, transform];
}
ELSE {
imagerHole ← ImagerPath.TrajectoryListFromPath[BuildPath].first;
holeCC ← GGTraj.IsClockwiseTraj[traj];
};
IF cc=holeCC THEN ImagerPath.MapTrajectoryBackward[imagerHole, moveTo, lineTo, curveTo, conicTo, arcTo]
ELSE ImagerPath.MapTrajectory[imagerHole, moveTo, lineTo, curveTo, conicTo, arcTo];
ENDLOOP;
};
traj: Traj;
thisSeq: Sequence;
slice: Outline ← sliceD.slice;
fence: Traj ← slice.children.first;
Fill in the outline if necessary.
IF fence.role = fence AND slice.fillColor#NIL THEN {
transformedColor: Color;
WITH slice.fillColor SELECT FROM
cc: ImagerColor.ConstantColor => {
Imager.SetColor[dc, cc];
};
sc: ImagerColor.SampledColor => {
IF OutlineCompleteParts[slice, sliceD.parts] THEN {
transformedColor ← ImagerColor.MakeSampledColor[pa: sc.pa, um: ImagerTransformation.Concat[sc.um, transform], colorOperator: sc.colorOperator];
Imager.SetColor[dc, transformedColor];
};
};
ENDCASE => ERROR;
Imager.MaskFill[dc, BuildOutline];
};
Draw the strokes.
thisSeq ← FindSequenceInList[fence, sliceParts.seqs];
IF thisSeq # NIL THEN GGTraj.DrawTrajTransformSeq[dc, thisSeq, transform] ELSE GGTraj.DrawTraj[dc, fence];
FOR holeList: LIST OF Traj ← slice.children.rest, holeList.rest UNTIL holeList = NIL DO
thisSeq ← FindSequenceInList[holeList.first, sliceParts.seqs];
IF thisSeq # NIL THEN GGTraj.DrawTrajTransformSeq[dc, thisSeq, transform] ELSE GGTraj.DrawTraj[dc, holeList.first];
ENDLOOP;
};
OutlineDrawSelectionFeedback: PROC [slice: Outline, selectedParts: SliceParts, hotParts: SliceParts, dc: Imager.Context, camera: CameraData, dragInProgress, caretIsMoving, hideHot, quick: BOOL] = {
normalOutlineParts, hotOutlineParts: OutlineParts;
normalList, hotList: LIST OF Sequence;
normalOutlineParts ← NARROW[selectedParts];
hotOutlineParts ← NARROW[hotParts];
IF caretIsMoving OR dragInProgress THEN RETURN;
IF selectedParts = NIL AND hotParts = NIL THEN RETURN;
IF selectedParts # NIL AND hotParts # NIL THEN {
hotList ← hotOutlineParts.seqs;
FOR normalList ← normalOutlineParts.seqs, normalList.rest UNTIL normalList = NIL DO
IF normalList.first # NIL THEN GGTraj.DrawSelectionFeedback[normalList.first.traj, normalList.first, hotList.first, dc, camera, dragInProgress, caretIsMoving, hideHot, quick]
ELSE IF hotList.first # NIL THEN GGTraj.DrawSelectionFeedback[hotList.first.traj, normalList.first, hotList.first, dc, camera, dragInProgress, caretIsMoving, hideHot, quick];
hotList ← hotList.rest;
ENDLOOP;
}
ELSE IF selectedParts # NIL THEN {
FOR normalList ← normalOutlineParts.seqs, normalList.rest UNTIL normalList = NIL DO
IF normalList.first # NIL THEN GGTraj.DrawSelectionFeedback[normalList.first.traj, normalList.first, NIL, dc, camera, dragInProgress, caretIsMoving, hideHot, quick];
ENDLOOP;
}
ELSE {
FOR hotList ← hotOutlineParts.seqs, hotList.rest UNTIL hotList = NIL DO
IF hotList.first # NIL THEN GGTraj.DrawSelectionFeedback[hotList.first.traj, NIL, hotList.first, dc, camera, dragInProgress, caretIsMoving, hideHot, quick];
ENDLOOP;
};
};
OutlineDrawAttractorFeedback: PUBLIC PROC [sliceD: OutlineDescriptor, selectedParts: SliceParts, dragInProgress: BOOL, dc: Imager.Context, camera: CameraData] = {
success: BOOL;
partType: TrajPartType;
traj: Traj;
seg: Segment;
jointNum: NAT;
[success, partType, traj, ----, jointNum, ----, ----, seg] ← UnpackSimpleDescriptorOld[sliceD];
SELECT partType FROM
joint => {
previous: Segment ← GGTraj.PreviousSegment[traj, jointNum];
this: Segment ← IF jointNum <= GGTraj.HiSegment[traj] THEN GGTraj.FetchSegment[traj, jointNum] ELSE NIL;
IF previous#NIL THEN DrawCpsAndJoints[dc, previous];
IF this#NIL THEN DrawCpsAndJoints[dc, this];
};
segment, controlPoint => DrawCpsAndJoints[dc, seg];
ENDCASE; -- none
};
Drawing Utilities
DrawOutline: PROC [dc: Imager.Context, outline: Outline] = {
Fill the outline if necessary.
BuildOutline: Imager.PathProc = {
BuildPath: Imager.PathProc = {
Someday this will be a call to
path.class.buildPath[traj, moveTo, lineTo, curveTo, conicTo, arcTo];
BuildTrajPath[traj, moveTo, lineTo, curveTo, conicTo, arcTo];
};
imagerHole: ImagerPath.Trajectory;
cc: BOOL;
traj ← fence;
cc ← GGTraj.IsClockwiseTraj[traj];
path.class.buildPath[traj, moveTo, lineTo, curveTo, conicTo, arcTo];
BuildTrajPath[traj, moveTo, lineTo, curveTo, conicTo, arcTo];
FOR holeList: LIST OF Traj ← outline.children.rest, holeList.rest UNTIL holeList = NIL DO
traj ← holeList.first;
imagerHole ← ImagerPath.TrajectoryListFromPath[BuildPath].first;
IF cc=GGTraj.IsClockwiseTraj[traj] THEN ImagerPath.MapTrajectoryBackward[imagerHole, moveTo, lineTo, curveTo, conicTo, arcTo]
ELSE ImagerPath.MapTrajectory[imagerHole, moveTo, lineTo, curveTo, conicTo, arcTo];
ENDLOOP;
};
fence, traj: Traj;
fence ← outline.children.first;
IF fence.role = fence AND outline.fillColor#NIL THEN {
Imager.SetColor[dc, outline.fillColor];
Imager.MaskFill[dc, BuildOutline];
};
Draw the strokes.
GGTraj.DrawTraj[dc, fence];
Will be path.class.drawBorder[fence, dc, ggData];
FOR holeList: LIST OF Traj ← outline.children.rest, holeList.rest UNTIL holeList = NIL DO
GGTraj.DrawTraj[dc, holeList.first];
Will be path.class.drawBorder[holeList.first, dc, ggData];
ENDLOOP;
};
FindSequenceInList: PROC [traj: Traj, seqList: LIST OF Sequence] RETURNS [seq: Sequence] = {
FOR list: LIST OF Sequence ← seqList, list.rest UNTIL list = NIL DO
IF list.first # NIL AND list.first.traj = traj THEN RETURN[list.first];
ENDLOOP;
RETURN[NIL];
};
BuildTrajPath: PROC [traj: Traj, moveTo: ImagerPath.MoveToProc, lineTo: ImagerPath.LineToProc,
curveTo: ImagerPath.CurveToProc, conicTo: ImagerPath.ConicToProc, arcTo: ImagerPath.ArcToProc] = {
DoBuildTrajPath: Imager.PathProc = {
seg: Segment;
firstPoint: Point ← GGTraj.FetchJointPos[traj, 0];
moveTo[ [firstPoint.x, firstPoint.y] ];
FOR i: INT IN [0..GGTraj.HiSegment[traj]] DO
seg ← GGTraj.FetchSegment[traj, i];
seg.class.buildPath[seg, lineTo, curveTo, conicTo, arcTo];
ENDLOOP;
};
DoBuildTrajPath[moveTo, lineTo, curveTo, conicTo, arcTo];
};
DrawCpsAndJoints: PROC [dc: Imager.Context, seg: Segment] = {
point: Point;
GGShapes.DrawJoint[dc, seg.lo];
GGShapes.DrawJoint[dc, seg.hi];
FOR j:INT IN [0..seg.class.controlPointCount[seg]) DO
point ← seg.class.controlPointGet[seg, j];
GGShapes.DrawCP[dc, point];
ENDLOOP;
};
Transforming
OutlineTransform: PUBLIC PROC [sliceD: OutlineDescriptor, transform: ImagerTransformation.Transformation] = {
outlineParts: OutlineParts ← NARROW[sliceD.parts];
slice: Outline ← sliceD.slice;
transformedColor: Color;
FOR list: LIST OF Sequence ← outlineParts.seqs, list.rest UNTIL list = NIL DO
IF list.first # NIL THEN GGTraj.TransformSequence[list.first, transform];
ENDLOOP;
UpdateBoundBox[slice];
IF slice.fillColor # NIL THEN {
WITH slice.fillColor SELECT FROM
cc: ImagerColor.ConstantColor => {};
sc: ImagerColor.SampledColor => {
IF OutlineCompleteParts[slice, sliceD.parts] THEN {
transformedColor ← ImagerColor.MakeSampledColor[pa: sc.pa, um: ImagerTransformation.Concat[sc.um, transform], colorOperator: sc.colorOperator];
slice.fillColor ← transformedColor;
};
};
ENDCASE => ERROR;
};
};
Textual Description
OneSequenceOnly: PROC [realParts: OutlineParts] RETURNS [theSeq: Sequence] = {
theSeq ← NIL;
FOR list: LIST OF Sequence ← realParts.seqs, list.rest UNTIL list = NIL DO
IF list.first # NIL THEN {
IF theSeq # NIL THEN RETURN[NIL]
ELSE theSeq ← list.first;
};
ENDLOOP;
};
OutlineDescribe: PROC [sliceD: OutlineDescriptor] RETURNS [rope: Rope.ROPE] = {
realParts: OutlineParts;
theSeq: Sequence;
IF sliceD.parts = NIL THEN RETURN["an Outline"];
realParts ← NARROW[sliceD.parts];
IF (theSeq ← OneSequenceOnly[realParts]) # NIL THEN {
rope ← GGSequence.Describe[theSeq];
}
ELSE {
FOR list: LIST OF Sequence ← realParts.seqs, list.rest UNTIL list = NIL DO
IF list.first # NIL THEN RETURN["several parts of a multi-trajectory outline"];
ENDLOOP;
rope ← "No outline parts to speak of.";
};
};
OutlineDescribeHit: PROC [slice: Outline, hitData: REF ANY] RETURNS [rope: Rope.ROPE] = {
outlineHitData: OutlineHitData ← NARROW[hitData];
rope ← GGTraj.DescribeHit[outlineHitData.traj, outlineHitData.hitType, outlineHitData.segNum, outlineHitData.cpNum, outlineHitData.jointNum];
};
OutlineFileout: PROC [slice: Outline, f: IO.STREAM] = {
count: NAT;
f.PutF["Outline:\n"];
f.PutF["fillColor: "]; GGParseOut.WriteColor[f, slice.fillColor];
f.PutF[" strokeEnd: "]; GGParseOut.WriteStrokeEnd[f, slice.lineEnds];
f.PutChar[IO.CR];
count ← 0;
FOR trajList: LIST OF Traj ← slice.children, trajList.rest UNTIL trajList = NIL DO
count ← count + 1;
ENDLOOP;
f.PutF["Trajectories: [%g]\n", [integer[count]]];
FOR trajList: LIST OF Traj ← slice.children, trajList.rest UNTIL trajList = NIL DO
GGTraj.Fileout[f, trajList.first];
ENDLOOP;
f.PutChar[IO.CR];
};
OutlineFilein: PROC [f: IO.STREAM, version: REAL, feedback: FeedbackData] RETURNS [slice: Outline] = {
fillColor: Color;
count: NAT;
fence, hole: Traj;
hasCircle: BOOL ← FALSE;
GGParseIn.ReadBlankAndRope[f, "fillColor:"];
fillColor ← GGParseIn.ReadColor[f, version];
IF version < 8702.26 THEN { -- read and discard StrokeEnd from older formats
GGParseIn.ReadBlankAndRope[f, "strokeEnd:"];
[] ← GGParseIn.ReadStrokeEnd[f];
};
GGParseIn.ReadBlankAndRope[f, "Trajectories:"];
GGParseIn.ReadBlankAndRope[f, "["];
count ← GGParseIn.ReadBlankAndNAT[f];
GGParseIn.ReadBlankAndRope[f, "]"];
[fence, hasCircle] ← GGTraj.Filein[f, version];
IF hasCircle THEN fillColor ← NIL; -- needed for the transition from circle/disc class
slice ← GGOutline.CreateOutline[fence, fillColor];
FOR i: NAT IN [1..count-1] DO
[hole, ----] ← GGTraj.Filein[f, version];
slice ← GGOutline.AddHole[slice, hole];
ENDLOOP;
};
Parts
IsEmpty: PROC [realParts: OutlineParts] RETURNS [BOOL] = {
FOR list: LIST OF Sequence ← realParts.seqs, list.rest UNTIL list = NIL DO
IF list.first # NIL AND NOT GGSequence.IsEmpty[list.first] THEN RETURN[FALSE];
ENDLOOP;
RETURN[TRUE];
};
OutlineEmptyParts: PROC [sliceD: OutlineDescriptor] RETURNS [BOOL] = {
realParts: OutlineParts ← NARROW[sliceD.parts];
RETURN[IsEmpty[realParts]];
};
CreateEmptyParts: PROC [slice: Outline] RETURNS [empty: SliceParts] = {
realParts: OutlineParts;
empty ← realParts ← NEW[OutlinePartsObj];
realParts.seqs ← NIL;
FOR list: LIST OF Traj ← slice.children, list.rest UNTIL list = NIL DO
realParts.seqs ← CONS[NIL, realParts.seqs];
ENDLOOP;
};
IsComplete: PROC [realParts: OutlineParts] RETURNS [BOOL] = {
FOR list: LIST OF Sequence ← realParts.seqs, list.rest UNTIL list = NIL DO
IF list.first = NIL THEN RETURN[FALSE];
IF NOT GGSequence.IsComplete[list.first] THEN RETURN[FALSE];
ENDLOOP;
RETURN[TRUE];
};
OutlineCompleteParts: PROC [slice: Outline, parts: SliceParts] RETURNS [BOOL] = {
realParts: OutlineParts ← NARROW[parts];
RETURN[IsComplete[realParts]];
};
OutlineNewParts: PROC [slice: Outline, hitData: REF ANY, mode: SelectMode] RETURNS [sliceD: OutlineDescriptor] = {
realParts: OutlineParts;
ptr: LIST OF Sequence;
trajGen: GGModelTypes.TrajGenerator;
parts: SliceParts;
realParts ← NEW[OutlinePartsObj];
[realParts.seqs, ptr] ← GGUtility.StartSequenceList[];
SELECT mode FROM
literal => {
traj: Traj;
hitType: GGModelTypes.TrajPartType;
segNum, cpNum, jointNum: INT;
seq: Sequence;
outlineHitData: OutlineHitData ← NARROW[hitData];
[traj, hitType, segNum, cpNum, jointNum] ← GGOutline.UnpackHitData[hitData];
SELECT hitType FROM
joint => seq ← GGSequence.CreateFromJoint[traj, jointNum];
controlPoint => seq ← GGSequence.CreateFromControlPoint[traj, segNum, cpNum];
segment => seq ← GGSequence.CreateSimpleFromSegment[traj, segNum];
ENDCASE => ERROR;
sliceD ← DescriptorFromSequence[slice, seq];
};
none => {
outlineHitData: OutlineHitData ← NARROW[hitData];
sliceD ← GGSlice.DescriptorFromParts[slice, CreateEmptyParts[slice]];
};
slice => {
completeSeq: Sequence;
trajGen ← TrajsInOutline[slice];
FOR traj: Traj ← GGScene.NextTraj[trajGen], GGScene.NextTraj[trajGen] UNTIL traj = NIL DO
completeSeq ← GGSequence.CreateComplete[traj];
[realParts.seqs, ptr] ← GGUtility.AddSequence[completeSeq, realParts.seqs, ptr];
ENDLOOP;
parts ← realParts;
};
joint => {
outlineHitData: OutlineHitData ← NARROW[hitData];
SELECT outlineHitData.hitType FROM
joint => { -- hit a joint
traj: Traj ← outlineHitData.traj;
jointNum: NAT ← outlineHitData.jointNum;
seq: Sequence ← GGSequence.CreateJointToJoint[traj, jointNum, jointNum];
parts ← PartsFromSequence[slice, seq];
};
segment => { -- we are in the middle of a segment. Select nearest joint or cp
success: BOOL;
segNum, cpNum, jointNum: NAT;
jointPoint, cpPoint, caretPt: Point;
traj: Traj;
seg: Segment;
seq: Sequence;
traj ← outlineHitData.traj;
segNum ← outlineHitData.segNum;
seg ← GGTraj.FetchSegment[traj, segNum];
caretPt ← outlineHitData.hitPoint;
jointNum ← NearestJointToHitSpot[caretPt, traj, -1, segNum, segment];
jointPoint ← GGTraj.FetchJointPos[traj, jointNum];
[cpPoint, cpNum, success] ← seg.class.closestControlPoint[seg, caretPt, GGUtility.plusInfinity];
IF NOT success THEN seq ← GGSequence.CreateJointToJoint[traj, jointNum, jointNum]
ELSE {
cpDist: REAL ← Vectors2d.DistanceSquared[cpPoint, caretPt];
jointDist: REAL ← Vectors2d.DistanceSquared[jointPoint, caretPt];
seq ← IF cpDist < jointDist THEN GGSequence.CreateFromControlPoint[traj, segNum, cpNum]
ELSE GGSequence.CreateJointToJoint[traj, jointNum, jointNum];
};
parts ← PartsFromSequence[slice, seq];
};
controlPoint => {
traj: Traj;
segNum, cpNum: NAT;
controlPointSeq: Sequence;
traj ← outlineHitData.traj;
segNum ← outlineHitData.segNum;
cpNum ← outlineHitData.cpNum;
controlPointSeq ← GGSequence.CreateFromControlPoint[traj, segNum, cpNum];
parts ← PartsFromSequence[slice, controlPointSeq];
};
ENDCASE => ERROR;
};
segment => {
outlineHitData: OutlineHitData ← NARROW[hitData];
SELECT outlineHitData.hitType FROM
joint => {
traj: Traj ← outlineHitData.traj;
jointNum: NAT ← outlineHitData.jointNum;
this: INT ← IF jointNum>GGTraj.HiSegment[traj] THEN -1 ELSE jointNum;
previous: INT ← GGTraj.PreviousSegmentNum[traj, jointNum];
parts ← PartsFromSequence[slice, GGSequence.CreateFromSegment[traj, IF this#-1 THEN this ELSE previous]];
};
segment, controlPoint => {
seq: Sequence ← GGSequence.CreateFromSegment[outlineHitData.traj, outlineHitData.segNum];
parts ← PartsFromSequence[slice, seq];
};
ENDCASE => ERROR;
};
traj => {
outlineHitData: OutlineHitData ← NARROW[hitData];
traj: Traj ← outlineHitData.traj;
seq: Sequence ← GGSequence.CreateComplete[traj];
parts ← PartsFromSequence[slice, seq];
};
topLevel => {
sliceD ← slice.class.newParts[slice, NIL, slice];
};
ENDCASE => ERROR;
IF sliceD = NIL THEN sliceD ← GGSlice.DescriptorFromParts[slice, parts];
};
OutlineUnionParts: PROC [partsA: OutlineDescriptor, partsB: OutlineDescriptor] RETURNS [aPlusB: OutlineDescriptor] = {
realPartsA: OutlineParts ← NARROW[partsA.parts];
realPartsB: OutlineParts ← NARROW[partsB.parts];
union: OutlineParts;
listA: LIST OF Sequence ← realPartsA.seqs;
listB: LIST OF Sequence ← realPartsB.seqs;
ptr: LIST OF Sequence;
IF partsA.parts = NIL THEN RETURN[partsB];
IF partsB.parts = NIL THEN RETURN[partsA];
IF IsEmpty[realPartsA] THEN RETURN[partsB];
IF IsEmpty[realPartsB] THEN RETURN[partsA];
IF IsComplete[realPartsA] THEN RETURN[partsA];
IF IsComplete[realPartsB] THEN RETURN[partsB];
union ← NEW[OutlinePartsObj];
[union.seqs, ptr] ← GGUtility.StartSequenceList[];
UNTIL listA = NIL DO
IF listA.first = NIL THEN [union.seqs, ptr] ← GGUtility.AddSequence[listB.first, union.seqs, ptr]
ELSE IF listB.first = NIL THEN [union.seqs, ptr] ← GGUtility.AddSequence[listA.first, union.seqs, ptr]
ELSE {
newSeq: Sequence ← GGSequence.Union[listA.first, listB.first];
[union.seqs, ptr] ← GGUtility.AddSequence[newSeq, union.seqs, ptr];
};
listA ← listA.rest;
listB ← listB.rest;
ENDLOOP;
aPlusB ← GGSlice.DescriptorFromParts[partsA.slice, union];
};
OutlineDifferenceParts: PROC [partsA: OutlineDescriptor, partsB: OutlineDescriptor] RETURNS [aMinusB: OutlineDescriptor] = {
realPartsA, realPartsB: OutlineParts;
diff: OutlineParts;
listA: LIST OF Sequence;
listB: LIST OF Sequence;
ptr: LIST OF Sequence;
IF partsA.parts = NIL OR partsB = NIL OR partsB.parts = NIL THEN RETURN[partsA];
realPartsA ← NARROW[partsA.parts];
realPartsB ← NARROW[partsB.parts];
listA ← realPartsA.seqs;
listB ← realPartsB.seqs;
diff ← NEW[OutlinePartsObj];
[diff.seqs, ptr] ← GGUtility.StartSequenceList[];
UNTIL listA = NIL DO
IF listA.first = NIL THEN [diff.seqs, ptr] ← GGUtility.AddSequence[NIL, diff.seqs, ptr]
ELSE IF listB.first = NIL THEN [diff.seqs, ptr] ← GGUtility.AddSequence[listA.first, diff.seqs, ptr]
ELSE {
newSeq: Sequence ← GGSequence.Difference[listA.first, listB.first];
[diff.seqs, ptr] ← GGUtility.AddSequence[newSeq, diff.seqs, ptr];
};
listA ← listA.rest;
listB ← listB.rest;
ENDLOOP;
aMinusB ← GGSlice.DescriptorFromParts[partsA.slice, diff];
};
OutlineMovingParts: PROC [slice: Outline, selectedParts: SliceParts] RETURNS [background, overlay, rubber, drag: OutlineDescriptor] = {
OPEN GGUtility;
Pass on the real work to GGSequence. Filled outlines have the property that if any of their subparts are on the overlay plane, then all of their parts are on the overlay plane.
outlineParts: OutlineParts ← NARROW[selectedParts];
bkgdParts, overParts, rubberParts, dragParts: OutlineParts;
bkgdSeq, overSeq, rubberSeq, dragSeq: Sequence;
bkgdPtr, overPtr, rubberPtr, dragPtr: LIST OF Sequence;
children: LIST OF Traj;
filled: BOOL ← slice.fillColor # NIL;
nullD: OutlineDescriptor ← slice.nullDescriptor;
IF IsEmpty[outlineParts] THEN {
background ← overlay ← rubber ← drag ← nullD;
RETURN;
};
IF IsComplete[outlineParts] THEN {
background ← overlay ← rubber ← nullD;
drag ← GGSlice.DescriptorFromParts[slice, selectedParts];
RETURN;
};
bkgdParts ← NEW[OutlinePartsObj];
overParts ← NEW[OutlinePartsObj];
rubberParts ← NEW[OutlinePartsObj];
dragParts ← NEW[OutlinePartsObj];
[bkgdParts.seqs, bkgdPtr] ← StartSequenceList[];
[overParts.seqs, overPtr] ← StartSequenceList[];
[rubberParts.seqs, rubberPtr] ← StartSequenceList[];
[dragParts.seqs, dragPtr] ← StartSequenceList[];
children ← slice.children;
FOR list: LIST OF Sequence ← outlineParts.seqs, list.rest UNTIL list = NIL DO
IF list.first = NIL THEN {
This trajectory is not at all selected. It will not move. If this outline is filled, put it on the overlay. Otherwise, leave it in the background.
[rubberParts.seqs, rubberPtr] ← AddSequence[NIL, rubberParts.seqs, rubberPtr];
[dragParts.seqs, dragPtr] ← AddSequence[NIL, dragParts.seqs, dragPtr];
IF filled THEN {
overSeq ← GGSequence.CreateComplete[children.first];
[overParts.seqs, overPtr] ← AddSequence[overSeq, overParts.seqs, overPtr];
[bkgdParts.seqs, bkgdPtr] ← AddSequence[NIL, bkgdParts.seqs, bkgdPtr];
}
ELSE {
bkgdSeq ← GGSequence.CreateComplete[children.first];
[bkgdParts.seqs, bkgdPtr] ← AddSequence[bkgdSeq, bkgdParts.seqs, bkgdPtr];
[overParts.seqs, overPtr] ← AddSequence[NIL, overParts.seqs, overPtr];
};
}
ELSE {
If the outline is filled, it has no background parts. Otherwise, all of its non-moving parts can be left on the background.
[bkgdSeq, overSeq, rubberSeq, dragSeq] ← GGSequence.TrajMovingParts[list.first];
IF filled THEN {
[bkgdParts.seqs, bkgdPtr] ← AddSequence[NIL, bkgdParts.seqs, bkgdPtr];
[overParts.seqs, overPtr] ← AddSequence[overSeq, overParts.seqs, overPtr];
[rubberParts.seqs, rubberPtr] ← AddSequence[rubberSeq, rubberParts.seqs, rubberPtr];
[dragParts.seqs, dragPtr] ← AddSequence[dragSeq, dragParts.seqs, dragPtr];
}
ELSE {
[bkgdParts.seqs, bkgdPtr] ← AddSequence[overSeq, bkgdParts.seqs, bkgdPtr];
[overParts.seqs, overPtr] ← AddSequence[NIL, overParts.seqs, overPtr];
[rubberParts.seqs, rubberPtr] ← AddSequence[rubberSeq, rubberParts.seqs, rubberPtr];
[dragParts.seqs, dragPtr] ← AddSequence[dragSeq, dragParts.seqs, dragPtr];
};
};
children ← children.rest;
ENDLOOP;
background ← GGSlice.DescriptorFromParts[slice, bkgdParts];
overlay ← GGSlice.DescriptorFromParts[slice, overParts];
rubber ← GGSlice.DescriptorFromParts[slice, rubberParts];
drag ← GGSlice.DescriptorFromParts[slice, dragParts];
};
NearestJointToHitSpot: PUBLIC PROC [caretPt: Point, traj: Traj, hitJointNum: INT, hitSegNum: INT, hitType: HitType] RETURNS [jointNum: NAT] = {
nextNum: NAT;
p1, p2: Point;
d1, d2: REAL;
SELECT hitType FROM
joint => {
jointNum ← hitJointNum;
};
segment, controlPoint => {
nextNum ← GGTraj.FollowingJoint[traj, hitSegNum];
p1 ← GGTraj.FetchJointPos[traj, hitSegNum];
p2 ← GGTraj.FetchJointPos[traj, nextNum];
d1 ← Vectors2d.DistanceSquared[p1, caretPt];
d2 ← Vectors2d.DistanceSquared[p2, caretPt];
IF d1 <= d2 THEN jointNum ← hitSegNum
ELSE jointNum ← nextNum;
};
ENDCASE => ERROR Problem[msg: "NearestJointToHitSpot NYI"];
}; -- end of NearestJointToHitSpot
NearestJointToHitData: PUBLIC PROC [hitData: REF ANY] RETURNS [jointNum: NAT, traj: Traj] = {
outlineHitData: OutlineHitData ← NARROW[hitData];
nextNum: NAT;
p1, p2: Point;
d1, d2: REAL;
traj ← outlineHitData.traj;
SELECT outlineHitData.hitType FROM
joint => {
jointNum ← outlineHitData.jointNum;
};
segment, controlPoint => {
nextNum ← GGTraj.FollowingJoint[traj, outlineHitData.segNum];
p1 ← GGTraj.FetchJointPos[traj, outlineHitData.segNum];
p2 ← GGTraj.FetchJointPos[traj, nextNum];
d1 ← Vectors2d.DistanceSquared[p1, outlineHitData.hitPoint];
d2 ← Vectors2d.DistanceSquared[p2, outlineHitData.hitPoint];
IF d1 <= d2 THEN jointNum ← outlineHitData.segNum
ELSE jointNum ← nextNum;
};
ENDCASE => ERROR;
};
OutlineAugmentParts: PROC [sliceD: OutlineDescriptor, selectClass: SelectionClass] RETURNS [more: OutlineDescriptor] = {
If selectClass = normal, then for each segment mentioned in parts, place it, its adjacent joints, and its control points in more. If selectClass # normal then just place each segment and its control points in more.
This mutates the OutlineDescriptor which may mean trouble. -- Bier, March 9, 1987
sliceParts: OutlineParts ← NARROW[sliceD.parts];
FOR list: LIST OF Sequence ← sliceParts.seqs, list.rest UNTIL list = NIL DO
IF list.first # NIL THEN GGSequence.AugmentParts[list.first, selectClass];
ENDLOOP;
more ← GGSlice.DescriptorFromParts[sliceD.slice, sliceParts];
};
OutlineSetSelectedFields: PROC [sliceD: OutlineDescriptor, selected: BOOL, selectClass: SelectionClass] = {
Set the selected fields of all of the joints and segments mentioned in sliceD.
sliceParts: OutlineParts ← NARROW[sliceD.parts];
FOR list: LIST OF Sequence ← sliceParts.seqs, list.rest UNTIL list = NIL DO
IF list.first # NIL THEN GGTraj.SetSelectedFields[list.first, selected, selectClass];
ENDLOOP;
};
Hit Testing
PointGeneratorData: TYPE = REF PointGeneratorDataObj;
PointGeneratorDataObj: TYPE = RECORD [
seqPtr: LIST OF Sequence,
pointGen: GGModelTypes.PointGenerator -- the point generator for the first sequence of seqPtr
];
PointPairGeneratorData: TYPE = REF PointPairGeneratorDataObj;
PointPairGeneratorDataObj: TYPE = RECORD [
seqPtr: LIST OF Sequence,
pointGen: GGModelTypes.PointPairGenerator -- the pair generator for first sequence of seqPtr
];
OutlinePointsInDescriptor: PUBLIC PROC [sliceD: OutlineDescriptor] RETURNS [pointGen: GGModelTypes.OutlinePointGenerator] = {
realParts: OutlineParts ← NARROW[sliceD.parts];
seqPtr: LIST OF Sequence ← realParts.seqs;
trajPointGen: GGModelTypes.PointGenerator;
pointGenData: PointGeneratorData;
trajPointGen ← IF seqPtr.first = NIL THEN NIL ELSE GGTraj.PointsInDescriptor[seqPtr.first];
pointGenData ← NEW[PointGeneratorDataObj ← [seqPtr: seqPtr, pointGen: trajPointGen]];
pointGen ← NEW[GGModelTypes.OutlinePointGeneratorObj ← [sliceD, 0, 0, pointGenData]];
};
OutlinePointPairsInDescriptor: PUBLIC PROC [sliceD: OutlineDescriptor] RETURNS [pointPairGen: GGModelTypes.OutlinePointPairGenerator] = {
realParts: OutlineParts ← NARROW[sliceD.parts];
seqPtr: LIST OF Sequence ← realParts.seqs;
trajPointGen: GGModelTypes.PointPairGenerator;
pointGenData: PointPairGeneratorData;
trajPointGen ← IF seqPtr.first = NIL THEN NIL ELSE GGTraj.PointPairsInDescriptor[seqPtr.first];
pointGenData ← NEW[PointPairGeneratorDataObj ← [seqPtr: seqPtr, pointGen: trajPointGen]];
pointPairGen ← NEW[GGModelTypes.OutlinePointPairGeneratorObj ← [sliceD, 0, 0, pointGenData]];
};
OutlineNextPoint: PUBLIC PROC [pointGen: GGModelTypes.OutlinePointGenerator] RETURNS [pointAndDone: GGModelTypes.PointAndDone] = {
pgd: PointGeneratorData ← NARROW[pointGen.classSpecific];
seqPtr: LIST OF Sequence ← pgd.seqPtr;
IF seqPtr = NIL THEN RETURN[[[0,0], TRUE]];
WHILE TRUE DO
IF seqPtr.first # NIL THEN {
pointAndDone ← GGTraj.NextPoint[pgd.pointGen];
IF NOT pointAndDone.done THEN {
pgd.seqPtr ← seqPtr;
RETURN;
};
seqPtr ← seqPtr.rest; -- on to the next sequence
};
UNTIL seqPtr = NIL OR seqPtr.first # NIL DO seqPtr ← seqPtr.rest ENDLOOP;
IF seqPtr = NIL THEN RETURN[[[0,0], TRUE]];
pgd.pointGen ← GGTraj.PointsInDescriptor[seqPtr.first];
ENDLOOP;
};
OutlineNextPointPair: PUBLIC PROC [pointPairGen: GGModelTypes.OutlinePointPairGenerator] RETURNS [pointPairAndDone: GGModelTypes.PointPairAndDone] = {
pgd: PointPairGeneratorData ← NARROW[pointPairGen.classSpecific];
seqPtr: LIST OF Sequence ← pgd.seqPtr;
IF seqPtr = NIL THEN RETURN[[[0,0], [0,0], TRUE]];
WHILE TRUE DO
IF seqPtr.first # NIL THEN {
pointPairAndDone ← GGTraj.NextPointPair[pgd.pointGen];
IF NOT pointPairAndDone.done THEN {
pgd.seqPtr ← seqPtr;
RETURN;
};
seqPtr ← seqPtr.rest; -- on to the next sequence
};
UNTIL seqPtr = NIL OR seqPtr.first # NIL DO seqPtr ← seqPtr.rest ENDLOOP;
IF seqPtr = NIL THEN RETURN[[[0,0], [0,0], TRUE]];
pgd.pointGen ← GGTraj.PointPairsInDescriptor[seqPtr.first];
ENDLOOP;
};
GoodPointType: TYPE = {joint, intersectionPoint, midpoint, controlPoint, slice, none};
OutlineClosestPoint: PROC [sliceD: OutlineDescriptor, testPoint: Point, tolerance: REAL] RETURNS [bestPoint: Point, bestDist: REAL, hitData: REF ANY, success: BOOL] = {
parts: OutlineParts ← NARROW[sliceD.parts];
thisDist: REAL;
thisSegNum, bestSegNum, thisCP, bestCP, thisJointNum, bestJointNum: NAT;
thisPoint: Point;
thisSuccess: BOOL;
bestTraj: Traj;
bestType: GoodPointType ← none;
outlineHitData: OutlineHitData;
success ← FALSE;
bestDist ← GGUtility.plusInfinity;
FOR list: LIST OF Sequence ← parts.seqs, list.rest UNTIL list = NIL DO
[thisDist, thisSegNum, thisCP, thisPoint, thisSuccess] ← GGTraj.NearestControlPoint[testPoint, list.first, tolerance];
IF thisSuccess AND thisDist < bestDist THEN {
bestType ← controlPoint;
bestPoint ← thisPoint;
bestDist ← thisDist;
bestTraj ← list.first.traj;
bestSegNum ← thisSegNum;
bestCP ← thisCP;
success ← TRUE;
};
ENDLOOP;
FOR list: LIST OF Sequence ← parts.seqs, list.rest UNTIL list = NIL DO
[thisDist, thisJointNum, thisPoint, thisSuccess] ← GGTraj.NearestJoint[testPoint, list.first, tolerance];
IF thisSuccess AND thisDist < bestDist THEN {
bestType ← joint;
bestPoint ← thisPoint;
bestDist ← thisDist;
bestTraj ← list.first.traj;
bestJointNum ← thisJointNum;
success ← TRUE;
};
ENDLOOP;
IF success THEN {
SELECT bestType FROM
controlPoint => {
hitData ← outlineHitData ← NEW[OutlineHitDataObj ← [
bestTraj, controlPoint, bestSegNum, bestCP, -1, bestPoint]];
};
joint => {
hitData ← outlineHitData ← NEW[OutlineHitDataObj ← [
bestTraj, joint, -1, -1, bestJointNum, bestPoint]];
};
ENDCASE => ERROR;
};
};
OutlineClosestJointToHitData: PUBLIC PROC [sliceD: OutlineDescriptor, mapPoint: Point, hitData: REF ANY] RETURNS [jointD: OutlineDescriptor, point: Point] = {
traj: Traj;
hitType: GGModelTypes.TrajPartType;
segNum, cpNum, jointNum: INT;
hitPoint: Point;
jointSeq: Sequence;
[traj, hitType, segNum, cpNum, jointNum, hitPoint] ← GGOutline.UnpackHitData[hitData];
SELECT hitType FROM
joint => {
jointSeq ← GGSequence.CreateFromJoint[traj, jointNum];
point ← mapPoint;
};
controlPoint => {
jointSeq ← GGSequence.CreateFromControlPoint[traj, segNum, cpNum];
point ← mapPoint;
};
segment => {
success: BOOL;
jointPoint, cpPoint: Point;
seg: Segment;
seg ← GGTraj.FetchSegment[traj, segNum];
[jointNum, ----] ← GGOutline.NearestJointToHitData[hitData];
jointPoint ← GGTraj.FetchJointPos[traj, jointNum];
[cpPoint, cpNum, success] ← seg.class.closestControlPoint[seg, mapPoint, GGUtility.plusInfinity];
IF NOT success THEN { -- its a joint for sure
jointSeq ← GGSequence.CreateFromJoint[traj, jointNum];
point ← jointPoint;
}
ELSE { -- could be a cp instead of a joint
cpDist: REAL ← Vectors2d.DistanceSquared[cpPoint, mapPoint];
jointDist: REAL ← Vectors2d.DistanceSquared[jointPoint, mapPoint];
tisAJoint: BOOL ← jointDist <= cpDist;
IF tisAJoint THEN {
jointSeq ← GGSequence.CreateFromJoint[traj, jointNum];
point ← jointPoint;
}
ELSE {
jointSeq ← GGSequence.CreateFromControlPoint[traj, segNum, cpNum];
point ← cpPoint;
};
};
};
ENDCASE => ERROR;
jointD ← GGOutline.DescriptorFromSequence[sliceD.slice, jointSeq];
};
OutlineClosestSegment: PUBLIC PROC [sliceD: OutlineDescriptor, testPoint: Point, tolerance: REAL] RETURNS [bestPoint: Point, bestDist: REAL, hitData: REF ANY, success: BOOL] = {
parts: OutlineParts ← NARROW[sliceD.parts];
thisDist: REAL;
thisSegNum, bestSegNum: NAT;
thisPoint: Point;
thisSuccess: BOOL;
bestTraj: Traj;
outlineHitData: OutlineHitData;
success ← FALSE;
bestDist ← GGUtility.plusInfinity;
FOR list: LIST OF Sequence ← parts.seqs, list.rest UNTIL list = NIL DO
[thisDist, thisSegNum, thisPoint, thisSuccess] ← GGTraj.NearestSegment[testPoint, list.first, tolerance];
IF thisSuccess AND thisDist < bestDist THEN {
bestPoint ← thisPoint;
bestDist ← thisDist;
bestTraj ← list.first.traj;
bestSegNum ← thisSegNum;
success ← TRUE;
};
ENDLOOP;
IF success THEN {
hitData ← outlineHitData ← NEW[OutlineHitDataObj ← [
bestTraj, segment, bestSegNum, -1, -1, bestPoint]];
};
};
OutlineLineIntersection: PUBLIC PROC [sliceD: OutlineDescriptor, line: Line] RETURNS [points: LIST OF Point, pointCount: NAT] = {
Finds the intersection of the line with those slice parts mentioned in sliceD.
segGen: GGModelTypes.SegmentGenerator;
thesePoints: LIST OF Point;
thisCount: NAT;
seq: Sequence;
parts: OutlineParts ← NARROW[sliceD.parts];
points ← NIL;
pointCount ← 0;
FOR list: LIST OF Sequence ← parts.seqs, list.rest UNTIL list = NIL DO
seq ← list.first;
IF seq = NIL THEN LOOP;
segGen ← GGSequence.SegmentsInSequence[seq];
FOR seg: Segment ← GGSequence.NextSegment[segGen], GGSequence.NextSegment[segGen] UNTIL seg = NIL DO
[thesePoints, thisCount] ← seg.class.lineIntersection[seg, line];
FOR list: LIST OF Point ← thesePoints, list.rest UNTIL list = NIL DO
points ← CONS[list.first, points];
ENDLOOP;
pointCount ← pointCount + thisCount;
ENDLOOP;
ENDLOOP;
};
OutlineCircleIntersection: PROC [sliceD: OutlineDescriptor, circle: Circle] RETURNS [points: LIST OF Point, pointCount: NAT] = {
segGen: GGModelTypes.SegmentGenerator;
thesePoints: LIST OF Point;
thisCount: NAT;
seq: Sequence;
parts: OutlineParts ← NARROW[sliceD.parts];
points ← NIL;
pointCount ← 0;
FOR list: LIST OF Sequence ← parts.seqs, list.rest UNTIL list = NIL DO
seq ← list.first;
IF seq = NIL THEN LOOP;
segGen ← GGSequence.SegmentsInSequence[seq];
FOR seg: Segment ← GGSequence.NextSegment[segGen], GGSequence.NextSegment[segGen] UNTIL seg = NIL DO
[thesePoints, thisCount] ← seg.class.circleIntersection[seg, circle];
FOR list: LIST OF Point ← thesePoints, list.rest UNTIL list = NIL DO
points ← CONS[list.first, points];
ENDLOOP;
ENDLOOP;
pointCount ← pointCount + thisCount;
ENDLOOP;
};
OutlineHitDataAsSimpleCurve: PROC [slice: Outline, hitData: REF ANY] RETURNS [simpleCurve: REF ANY] = {
simpleCurve will be of type Edge, Arc, etc. There will be Conic and Bezier types as well.
outlineHitData: OutlineHitData ← NARROW[hitData];
traj: Traj ← outlineHitData.traj;
SELECT outlineHitData.hitType FROM
joint, controlPoint => RETURN[NIL];
segment => {
segNum: INT ← outlineHitData.segNum;
seg: Segment ← GGTraj.FetchSegment[traj, segNum];
simpleCurve ← seg.class.asSimpleCurve[seg, outlineHitData.hitPoint];
};
ENDCASE => ERROR;
};
Style
OutlineSetDefaults: PROC [slice: Outline, parts: SliceParts, defaults: DefaultData] = {
realParts: OutlineParts ← NARROW[parts];
maybe should implement parts=NIL to mean all parts
slice.fillColor ← defaults.fillColor;
FOR list: LIST OF Sequence ← realParts.seqs, list.rest UNTIL list = NIL DO
IF list.first # NIL THEN {
this is inefficient but easy to implement
seq: Sequence ← list.first;
GGSequence.SetStrokeWidth[seq, defaults.strokeWidth];
GGTraj.SetTrajStrokeJoint[seq.traj, defaults.strokeJoint];
GGSequence.SetStrokeEnd[seq, defaults.strokeEnd];
GGSequence.SetStrokeDashed[seq, defaults.dashed, GGUtility.CopyPattern[defaults.pattern], defaults.offset, defaults.length];
GGSequence.SetStrokeColor[seq, defaults.strokeColor];
};
ENDLOOP;
};
OutlineSetStrokeWidth: PROC [slice: Outline, parts: SliceParts, strokeWidth: REAL] RETURNS [box: BoundBox] = {
Sets the stroke width of the named parts of slice to be strokeWidth.
realParts: OutlineParts ← NARROW[parts];
FOR list: LIST OF Sequence ← realParts.seqs, list.rest UNTIL list = NIL DO
IF list.first # NIL THEN GGSequence.SetStrokeWidth[list.first, strokeWidth];
ENDLOOP;
The following is very conservative and wasteful
UpdateBoundBox[slice];
box ← slice.boundBox;
};
OutlineGetStrokeWidth: PROC [slice: Outline, parts: SliceParts] RETURNS [strokeWidth: REAL] = {
Get the stroke width of the first segment you come to.
realParts: OutlineParts ← NARROW[parts];
FOR list: LIST OF Sequence ← realParts.seqs, list.rest UNTIL list = NIL DO
IF list.first # NIL THEN RETURN[GGSequence.GetStrokeWidth[list.first]];
ENDLOOP;
RETURN[-1.0];
};
OutlineSetStrokeEnd: PROC [slice: Outline, parts: SliceParts, strokeEnd: StrokeEnd] = {
Sets the stroke end of the named parts of slice to be strokeEnd.
realParts: OutlineParts ← NARROW[parts];
FOR list: LIST OF Sequence ← realParts.seqs, list.rest UNTIL list = NIL DO
IF list.first # NIL THEN GGSequence.SetStrokeEnd[list.first, strokeEnd];
ENDLOOP;
};
OutlineGetStrokeEnd: PROC [slice: Outline, parts: SliceParts] RETURNS [strokeEnd: StrokeEnd] = {
Get the stroke end of the first segment you come to.
realParts: OutlineParts ← NARROW[parts];
FOR list: LIST OF Sequence ← realParts.seqs, list.rest UNTIL list = NIL DO
IF list.first # NIL THEN RETURN[GGSequence.GetStrokeEnd[list.first]];
ENDLOOP;
RETURN[round];
};
OutlineSetStrokeJoint: PROC [slice: Outline, parts: SliceParts, strokeJoint: StrokeJoint] = {
Sets the stroke Joint of the named parts of slice to be strokeEnd.
realParts: OutlineParts ← NARROW[parts];
FOR list: LIST OF Sequence ← realParts.seqs, list.rest UNTIL list = NIL DO
IF list.first # NIL THEN GGTraj.SetTrajStrokeJoint[list.first.traj, strokeJoint];
ENDLOOP;
};
OutlineGetStrokeJoint: PROC [slice: Outline, parts: SliceParts] RETURNS [strokeJoint: StrokeJoint] = {
Get the stroke joint of the first segment you come to.
realParts: OutlineParts ← NARROW[parts];
FOR list: LIST OF Sequence ← realParts.seqs, list.rest UNTIL list = NIL DO
IF list.first # NIL THEN RETURN[GGTraj.GetTrajStrokeJoint[list.first.traj]];
ENDLOOP;
RETURN[round];
};
OutlineSetStrokeColor: PROC [slice: Outline, parts: SliceParts, color: Color] = {
Sets the stroke color of the named parts of slice to be color.
realParts: OutlineParts ← NARROW[parts];
FOR list: LIST OF Sequence ← realParts.seqs, list.rest UNTIL list = NIL DO
IF list.first # NIL THEN GGSequence.SetStrokeColor[list.first, color];
ENDLOOP;
};
OutlineGetStrokeColor: PROC [slice: Outline, parts: SliceParts] RETURNS [color: Color] = {
Get the stroke color of the named parts of slice.
realParts: OutlineParts ← NARROW[parts];
FOR list: LIST OF Sequence ← realParts.seqs, list.rest UNTIL list = NIL DO
IF list.first # NIL THEN RETURN[GGSequence.GetStrokeColor[list.first]];
ENDLOOP;
RETURN[NIL];
};
OutlineSetFillColor: PROC [slice: Outline, color: Color] = {
Sets the fill color of the slice to be color.
slice.fillColor ← color;
};
OutlineGetFillColor: PROC [slice: Outline] RETURNS [color: Color] = {
Get the fill color of the slice.
color ← slice.fillColor;
};
OutlineSetDashed: PUBLIC PROC [slice: Outline, parts: SliceParts, dashed: BOOL, pattern: SequenceOfReal ← NIL, offset: REAL ← 0.0, length: REAL ← -1.0] = {
realParts: OutlineParts ← NARROW[parts];
FOR list: LIST OF Sequence ← realParts.seqs, list.rest UNTIL list = NIL DO
IF list.first # NIL THEN GGSequence.SetStrokeDashed[list.first, dashed, pattern, offset, length];
ENDLOOP;
};
OutlineGetDashed: PROC [slice: Outline, parts: SliceParts] RETURNS [dashed: BOOL, pattern: SequenceOfReal, offset, length: REAL] = {
Get the dash pattern of the named parts of slice.
realParts: OutlineParts ← NARROW[parts];
FOR list: LIST OF Sequence ← realParts.seqs, list.rest UNTIL list = NIL DO
IF list.first # NIL THEN {
[dashed, pattern, offset, length] ← GGSequence.GetStrokeDashed[list.first];
RETURN;
};
ENDLOOP;
RETURN[FALSE, NIL, 0.0, 0.0];
};
Utility Routines
AppendTrajList: PUBLIC PROC [list1, list2: LIST OF Traj] RETURNS [result: LIST OF Traj] = {
pos: LIST OF Traj;
newCell: LIST OF Traj;
Non-destructive (copies the first list).
IF list1 = NIL THEN RETURN[list2];
result ← CONS[list1.first, NIL];
pos ← result;
FOR l: LIST OF Traj ← list1.rest, l.rest UNTIL l = NIL DO
newCell ← CONS[l.first, NIL];
pos.rest ← newCell;
pos ← newCell;
ENDLOOP;
pos.rest ← list2;
};
globalOutlineClass: OutlineClass;
Init: PROC [] = {
globalOutlineClass ← MakeOutlineClass[];
};
Init[];
END.