DIRECTORY
Atom, BiScrollers, BufferedRefresh, CodeTimer, Feedback, FunctionCache, GGBasicTypes, GGBoundBox, GGCaret, GGGravity, GGInterfaceTypes, GGModelTypes, GGScene, GGRefresh, GGSegmentTypes, GGSelect, GGSequence, GGShapes, GGTraj, GGUtility, Imager, ImagerBackdoor, ImagerTransformation, List, Rope, Rosary, SlackProcess, TIPUser, Vectors2d, ViewerAbort, ViewerClasses;

GGRefreshImpl: CEDAR MONITOR
IMPORTS Atom, BiScrollers, BufferedRefresh, CodeTimer, Feedback, FunctionCache, GGBoundBox, GGCaret, GGGravity, GGScene, GGSelect, GGSequence, GGShapes, GGTraj, GGUtility, Imager, ImagerBackdoor, List, Rope, SlackProcess, Vectors2d, ViewerAbort
EXPORTS GGRefresh = BEGIN

BitVector: TYPE = GGBasicTypes.BitVector;
BoundBox: TYPE = GGModelTypes.BoundBox;
BoundBoxGenerator: TYPE = GGScene.BoundBoxGenerator;
CameraData: TYPE = GGModelTypes.CameraData;
Caret: TYPE = GGInterfaceTypes.Caret;
Color: TYPE = Imager.Color;
FeatureData: TYPE = GGGravity.FeatureData;
OutlineDescriptor: TYPE = GGModelTypes.OutlineDescriptor;
Rectangle: TYPE = Imager.Rectangle;
Sandwich: TYPE = BufferedRefresh.Sandwich;
Slice: TYPE = GGModelTypes.Slice;
SliceParts: TYPE = GGModelTypes.SliceParts;
SliceGenerator: TYPE = GGModelTypes.SliceGenerator;
SliceDescriptor: TYPE = GGModelTypes.SliceDescriptor;
SliceDescriptorGenerator: TYPE = GGModelTypes.SliceDescriptorGenerator;
EntityGenerator: TYPE = GGModelTypes.EntityGenerator;
GGData: TYPE = GGInterfaceTypes.GGData;
Joint: TYPE = GGModelTypes.Joint;
JointGenerator: TYPE = GGModelTypes.JointGenerator;
Outline: TYPE = GGModelTypes.Outline;
Point: TYPE = GGBasicTypes.Point;
Scene: TYPE = GGModelTypes.Scene;
Segment: TYPE = GGSegmentTypes.Segment;
SegAndIndex: TYPE = GGSequence.SegAndIndex;
SegmentGenerator: TYPE = GGModelTypes.SegmentGenerator;
Sequence: TYPE = GGModelTypes.Sequence;
SelectionClass: TYPE = GGInterfaceTypes.SelectionClass;
SequenceGenerator: TYPE = GGModelTypes.SequenceGenerator;
Traj: TYPE = GGModelTypes.Traj;
Vector: TYPE = GGBasicTypes.Vector;

Problem: PUBLIC SIGNAL [msg: Rope.ROPE] = CODE;
ActionAreaPaint: PUBLIC PROC [screen: Imager.Context, whatHasChanged: ATOM, ggData: GGData] = TRUSTED {
PaintWithAbort: PROC = TRUSTED {
DoActionAreaPaint[screen, whatHasChanged, ggData ! UNWIND => {
Feedback.Append[ggData.feedback, "Refresh Aborted", oneLiner];
SlackProcess.FlushQueue[ggData.slackHandle]; -- you have to do this HERE!
ggData.refresh.suppressRefresh _ FALSE; -- in case you killed FastPlayback
ggData.aborted _ ALL[TRUE]; -- copies of aborted for all purposes
};
];
};
IF whatHasChanged=$ViewersPaintEntireScene THEN ViewerAbort.CallWithAbortEnabled[ggData.actionArea, PaintWithAbort]
ELSE DoActionAreaPaint[screen, whatHasChanged, ggData]; -- SlackProcess is watching for aborts
};

DoActionAreaPaint: PROC [screen: Imager.Context, whatHasChanged: ATOM, ggData: GGData] = {
showColors: BOOL _ ggData.refresh.showColors.state = on;
IF ggData.aborted[refresh] THEN { -- last paint got killed => unknown bitmap cache states
ggData.aborted[refresh] _ FALSE;
PaintEntireScene[screen, ggData, showColors];
}
ELSE SELECT whatHasChanged FROM
$None => NULL;
$PaintEntireScene, $ViewersPaintEntireScene => PaintEntireScene[screen, ggData, showColors];
$ViewersPaintAllPlanes => PaintAllPlanes[screen, ggData, showColors, FALSE, FALSE];
$NewAlignmentsDeselected => PaintAllPlanes[screen, ggData, showColors, FALSE, FALSE];
$NewAlignmentsSelected => PaintAllPlanes[screen, ggData, showColors, FALSE, FALSE];
$SequencesMadeHot => PaintAllPlanes[screen, ggData, showColors, FALSE, FALSE];
$SequencesMadeCold => PaintAllPlanes[screen, ggData, showColors, FALSE, FALSE];
$Everything => PaintEntireScene[screen, ggData, showColors];
$SelectionChanged => PaintAllPlanes[screen, ggData, showColors, FALSE, FALSE];
$FinishedAdding => FinishedAdding[screen, ggData, showColors];
$FinishedDragging => FinishedDragging[screen, ggData, showColors];
$CaretMoved => PaintAllPlanes[screen, ggData, showColors, FALSE, FALSE]; -- GGMouseEventImplA
$AnchorAdded => PaintAllPlanes[screen, ggData, showColors, FALSE, FALSE]; -- GGEventImplB
$AnchorRemoved => PaintAllPlanes[screen, ggData, showColors, FALSE, FALSE]; -- GGEventImplB
$DuringMotion => PaintDragOverlay[screen, ggData, TRUE, showColors]; -- GGMouseEventImplA
$DuringCaretPos => PaintDragOverlay[screen, ggData, FALSE, showColors]; -- GGMouseEventImplA
$DuringSelect => DuringSelect[screen, ggData, showColors];
$ObjectChangedInPlace => ObjectChangedInPlace[screen, ggData, normal, showColors];
$ObjectChangedBoundBoxProvided => ObjectChangedBoundBoxProvided[screen, ggData, showColors];
$ObjectAdded => ObjectAdded[screen, ggData, showColors];
$PaintSpot => PaintSpot[screen, ggData];
$PaintHitLine => PaintHitLine[screen, ggData];
$PaintOddHitLine => PaintOddHitLine[screen, ggData];
$PaintAlign => PaintAlign[screen, ggData];
$PaintBoundBoxes => PaintBoundBoxes[screen, ggData];
$PaintTightBoxes => PaintTightBoxes[screen, ggData];
$PaintOutlineBoxes => PaintOutlineBoxes[screen, ggData];
$PaintSelectionBox => PaintSelectionBox[screen, ggData];
$DrawBackgroundBox, $DrawOverlayBox, $DrawRubberBox, $DrawDragBox => DrawMovingBox[screen, ggData, whatHasChanged];
ENDCASE => {
Feedback.Append[ggData.feedback, Rope.Cat["Gargoyle GGRefreshImpl doesn't know how to ", Atom.GetPName[whatHasChanged], "."], oneLiner];
Feedback.Blink[ggData.feedback];
};
};



CreateSandwich: PUBLIC PROC [] RETURNS [sandwich: Sandwich] = {
sandwich _ BufferedRefresh.CreateSandwich[LIST[
[$Background, TRUE, RefreshBackground], -- back ...
[$Overlay, FALSE, RefreshOverlay],
[$CPFeedback, FALSE, RefreshCPFeedback],
[$Foreground, TRUE, RefreshForeground],
[$CaretPlane, FALSE, RefreshCaretPlane]]]; -- ... to front
};

PaintEntireScene: PUBLIC PROC [screen: Imager.Context, ggData: GGData, showColors: BOOL] = {
sandwich: Sandwich _ ggData.refresh.sandwich;
CodeTimer.StartInt[$PaintEntireScene, $Gargoyle];
BufferedRefresh.SetLayerOK[sandwich, $Foreground, FALSE];
BufferedRefresh.SetLayerOK[sandwich, $Background, FALSE];
PaintAllPlanes[screen, ggData, showColors, FALSE, FALSE];
CodeTimer.StopInt[$PaintEntireScene, $Gargoyle];
};

PaintAllPlanes: PROC [screen: Imager.Context, ggData: GGData, showColors: BOOL, caretIsMoving: BOOL, dragInProgress: BOOL] = {
sandwich: Sandwich _ ggData.refresh.sandwich;
clientToViewer, viewerToClient: Imager.Transformation;
ignoreBackingMap: BOOL;
IF ggData.refresh.suppressRefresh THEN RETURN;
ggData.refresh.caretIsMoving _ caretIsMoving;
ggData.refresh.dragInProgress _ dragInProgress;
[clientToViewer, viewerToClient] _ BiScrollers.GetStyle[].GetTransforms[BiScrollers.QuaBiScroller[ggData.actionArea]];
ignoreBackingMap _ showColors;
BufferedRefresh.DrawSandwich[sandwich, screen, clientToViewer, viewerToClient, ggData, ignoreBackingMap];
};

RefreshBackground: PROC [dc: Imager.Context, boundRect: Rectangle, clientData: REF ANY] = {
ggData: GGData _ NARROW[clientData];
IF ggData.refresh.suppressRefresh THEN RETURN;
DrawObjectsFiltered[dc: dc, ggData: ggData, filter: GGBoundBox.BoundBoxFromRectangle[boundRect], excludeOverlay: FALSE, overObject: NIL];
};

RefreshOverlay: PROC [dc: Imager.Context, boundRect: Rectangle, clientData: REF ANY] = {
ggData: GGData _ NARROW[clientData];
DrawDragOverlayAux: PROC = {
IF ggData.refresh.orderedOverlayList=NIL THEN ggData.refresh.orderedOverlayList _ OrderOverlayList[ggData]; -- update ordered list
FOR oList: LIST OF REF ANY _ ggData.refresh.orderedOverlayList, oList.rest UNTIL oList = NIL DO
WITH oList.first SELECT FROM
sliceD: SliceDescriptor => {
sliceD.slice.class.drawTransform[sliceD, dc, ggData.camera, ggData.drag.transform];
};
outlineD: OutlineDescriptor => {
outlineD.slice.class.drawTransform[outlineD, dc, ggData.camera, ggData.drag.transform];
};
caret: Caret => {
caret _ NARROW[oList.first];
DrawCaret[dc, caret, Imager.black];
};
ENDCASE => ERROR;
ENDLOOP;
};
IF ggData.refresh.suppressRefresh THEN RETURN;
Imager.DoSaveAll[dc, DrawDragOverlayAux];
};

RefreshCPFeedback: PROC [dc: Imager.Context, boundRect: Rectangle, clientData: REF ANY] = {
ggData: GGData _ NARROW[clientData];
caretIsMoving: BOOL _ ggData.refresh.caretIsMoving;
dragInProgress: BOOL _ ggData.refresh.dragInProgress;
IF ggData.refresh.suppressRefresh THEN RETURN;
IF ggData.camera.quality#quality THEN {
DrawAttractorFeedback[dc, ggData, dragInProgress, caretIsMoving];
DrawCpsOfSelectedOutlines[dc, ggData.scene, ggData.camera, dragInProgress, caretIsMoving];
DrawCpsOfSelectedSlices[dc, ggData.scene, ggData.camera, dragInProgress, caretIsMoving];
};
};

RefreshForeground: PROC [dc: Imager.Context, boundRect: Rectangle, clientData: REF ANY] = {
ggData: GGData _ NARROW[clientData];
IF ggData.refresh.suppressRefresh THEN RETURN;
FunctionCache.Flush[ggData.refresh.lineCache];
GGGravity.DrawAlignBagRegardless[dc, ggData.hitTest.alignBag, ggData];
};

RefreshCaretPlane: PROC [dc: Imager.Context, boundRect: Rectangle, clientData: REF ANY] = {
ggData: GGData _ NARROW[clientData];
IF ggData.refresh.suppressRefresh THEN RETURN;
DrawCaret[dc, ggData.caret, Imager.black];
DrawAnchor[dc, ggData.anchor, Imager.black];
};

NoteNewForeground: PUBLIC PROC [alignObjects: LIST OF FeatureData, ggData: GGData] = {
PaintForeground: PROC = {
GGGravity.DrawFeatureList[foregroundContext, alignObjects, ggData];
};
foregroundContext: Imager.Context _ BufferedRefresh.GetLayerContext[ggData.refresh.sandwich, $Foreground];
Imager.DoSaveAll[foregroundContext, PaintForeground];
BufferedRefresh.SetLayerOK[ggData.refresh.sandwich, $Foreground, TRUE];
};

UpdateForegroundForMotion: PUBLIC PROC [ggData: GGData] = {
PaintForeground: PROC = {
GGGravity.DrawAlignBagRegardless[foregroundContext, ggData.hitTest.alignBag, ggData];
};
foregroundContext: Imager.Context _ BufferedRefresh.GetLayerContext[ggData.refresh.sandwich, $Foreground];
Imager.DoSaveAll[foregroundContext, PaintForeground];
BufferedRefresh.SetLayerOK[ggData.refresh.sandwich, $Foreground, TRUE];
};



DrawAttractorFeedback: PROC [dc: Imager.Context, ggData: GGData, dragInProgress, caretIsMoving: BOOL] = {
attractor: REF ANY;
selectedParts: SliceParts;
scene: Scene _ ggData.scene;

attractor _ GGCaret.GetAttractor[ggData.caret];
IF attractor = NIL THEN RETURN;
WITH attractor SELECT FROM
sliceD: SliceDescriptor => {
selectedD: SliceDescriptor _ GGSelect.FindSelectedSlice[sliceD.slice, scene, normal];
selectedParts _ IF selectedD = NIL THEN NIL ELSE selectedD.parts; 
sliceD.slice.class.drawAttractorFeedback[sliceD, selectedParts, dragInProgress, dc, ggData.camera];
};
outlineD: OutlineDescriptor => {
selectedD: OutlineDescriptor _ GGSelect.FindSelectedOutline[outlineD.slice, scene, normal];
selectedParts _ IF selectedD = NIL THEN NIL ELSE selectedD.parts; 
outlineD.slice.class.drawAttractorFeedback[outlineD, selectedParts, dragInProgress, dc, ggData.camera];
};
ENDCASE => ERROR;
};


MemberTraj: PROC [ref: Traj, list: LIST OF Traj] RETURNS [BOOL] = {
FOR tl: LIST OF Traj _ list, tl.rest UNTIL tl = NIL DO
IF tl.first = ref THEN RETURN[TRUE];
ENDLOOP;
RETURN[FALSE];
};

AllSelectedOutlines: PROC [scene: Scene] RETURNS [selectedList: LIST OF Outline _ NIL] = {
ptr: LIST OF Outline;
outDGen: GGModelTypes.OutlineDescriptorGenerator;
outDGen _  GGSelect.SelectedOutlines[scene, hot];
[selectedList, ptr] _ GGUtility.StartOutlineList[];
FOR outD: OutlineDescriptor _ GGSelect.NextOutlineDescriptor[outDGen], GGSelect.NextOutlineDescriptor[outDGen] UNTIL outD = NIL DO
[selectedList, ptr] _ GGUtility.AddOutline[outD.slice, selectedList, ptr];
ENDLOOP;
outDGen _  GGSelect.SelectedOutlines[scene, normal];
FOR outD: OutlineDescriptor _ GGSelect.NextOutlineDescriptor[outDGen], GGSelect.NextOutlineDescriptor[outDGen] UNTIL outD = NIL DO
IF NOT GGSelect.IsSelectedInPart[outD.slice, scene, hot] THEN [selectedList, ptr] _ GGUtility.AddOutline[outD.slice, selectedList, ptr];
ENDLOOP;
};

AllSelectedSlices: PROC [scene: Scene] RETURNS [selectedList: LIST OF Slice _ NIL] = {
ptr: LIST OF Slice;
sGen: SliceDescriptorGenerator _  GGSelect.SelectedSlices[scene, hot];
[selectedList, ptr] _ GGUtility.StartSliceList[];
FOR sd: SliceDescriptor _ GGSelect.NextSliceDescriptor[sGen], GGSelect.NextSliceDescriptor[sGen] UNTIL sd = NIL DO
[selectedList, ptr] _ GGUtility.AddSlice[sd.slice, selectedList, ptr];
ENDLOOP;
sGen _ GGSelect.SelectedSlices[scene, normal];
FOR sd: SliceDescriptor _ GGSelect.NextSliceDescriptor[sGen], GGSelect.NextSliceDescriptor[sGen] UNTIL sd = NIL DO
IF NOT GGSelect.IsSelectedInPart[sd.slice, scene, hot] THEN [selectedList, ptr] _ GGUtility.AddSlice[sd.slice, selectedList, ptr];
ENDLOOP;
};

DrawCpsOfSelectedOutlines: PROC [dc: Imager.Context, scene: Scene, camera: CameraData, dragInProgress, caretIsMoving: BOOL] = {
normalD, hotD: OutlineDescriptor;
normalParts, hotParts: SliceParts;
outline: Outline;
IF caretIsMoving OR dragInProgress THEN RETURN;
FOR oList: LIST OF Outline _ AllSelectedOutlines[scene], oList.rest UNTIL oList=NIL DO
outline _ oList.first;
normalD _ GGSelect.FindSelectedOutline[outline, scene, normal];
hotD _ GGSelect.FindSelectedOutline[outline, scene, hot];
normalParts _ IF normalD # NIL THEN normalD.parts ELSE NIL;
hotParts _ IF hotD # NIL THEN hotD.parts ELSE NIL;
outline.class.drawSelectionFeedback[outline, normalParts, hotParts, dc, camera, dragInProgress, caretIsMoving, FALSE, caretIsMoving];
ENDLOOP;
};


DrawCpsOfSelectedSlices: PROC [dc: Imager.Context, scene: Scene, camera: CameraData, dragInProgress, caretIsMoving: BOOL] = {
normalSliceD, hotSliceD: SliceDescriptor;
normalParts, hotParts: SliceParts;
slice: Slice;
IF caretIsMoving OR dragInProgress THEN RETURN;
FOR sList: LIST OF Slice _ AllSelectedSlices[scene], sList.rest UNTIL sList=NIL DO
slice _ sList.first;
normalSliceD _ GGSelect.FindSelectedSlice[slice, scene, normal];
hotSliceD _ GGSelect.FindSelectedSlice[slice, scene, hot];
normalParts _ IF normalSliceD # NIL THEN normalSliceD.parts ELSE NIL;
hotParts _ IF hotSliceD # NIL THEN hotSliceD.parts ELSE NIL;
slice.class.drawSelectionFeedback[slice, normalParts, hotParts, dc, camera, dragInProgress, caretIsMoving, FALSE, caretIsMoving];
ENDLOOP;
};


MemberSlice: PROC [ref: SliceDescriptor, list: LIST OF SliceDescriptor] RETURNS [BOOL] = {
FOR tl: LIST OF SliceDescriptor _ list, tl.rest UNTIL tl = NIL DO
IF tl.first = ref THEN RETURN[TRUE];
ENDLOOP;
RETURN[FALSE];
};

ObjectChangedInPlace: PROC [screen: Imager.Context, ggData: GGData, selectClass: GGInterfaceTypes.SelectionClass _ normal, showColors: BOOL] = {
bBox: BoundBox _ GGBoundBox.BoundBoxOfSelected[ggData.scene, selectClass];
RepairBackgroundInBoundBox[ggData, bBox, TRUE, NIL];
PaintAllPlanes[screen, ggData, showColors, FALSE, FALSE];
};

ObjectChangedBoundBoxProvided: PROC [screen: Imager.Context, ggData: GGData, showColors: BOOL] = {
RepairBackgroundInBoundBox[ggData, ggData.refresh.startBoundBox, TRUE, NIL];
PaintAllPlanes[screen, ggData, showColors, FALSE, FALSE];
};

ObjectAdded: PROC [screen: Imager.Context, ggData: GGData, showColors: BOOL] = {
RepairBackgroundInBoundBox[ggData, ggData.refresh.startBoundBox, FALSE, ggData.refresh.addedObject];
PaintAllPlanes[screen, ggData, showColors, FALSE, FALSE];
};

RepairBackgroundInBoundBox: PROC [ggData: GGData, bBox: BoundBox, eraseFirst: BOOL _ FALSE, overObject: REF ANY] = {
backgroundContext: Imager.Context _ BufferedRefresh.GetLayerContext[ggData.refresh.sandwich, $Background];
IF ggData.refresh.suppressRefresh THEN RETURN;
IF ggData.refresh.showColors.state = off THEN {
PaintObjectsInBox: PROC = {
IF eraseFirst THEN GGBoundBox.EraseWithinBoundBox[backgroundContext, bBox];
DrawObjectsFiltered[dc: backgroundContext, ggData: ggData, filter: bBox, overObject: overObject];
};
Imager.DoSaveAll[backgroundContext, PaintObjectsInBox];
BufferedRefresh.SetLayerOK[ggData.refresh.sandwich, $Background, TRUE];
};
};

DuringSelect: PROC [screen: Imager.Context, ggData: GGData, showColors: BOOL] = {
IF ggData.refresh.suppressRefresh THEN RETURN;
IF NOT showColors THEN {
clientToViewer, viewerToClient: Imager.Transformation;
[clientToViewer, viewerToClient] _ BiScrollers.GetStyle[].GetTransforms[BiScrollers.QuaBiScroller[ggData.actionArea]];
BufferedRefresh.DrawSandwich[ggData.refresh.sandwich, screen, clientToViewer, viewerToClient, ggData, showColors];
}
ELSE {}; -- no feedback in SlowPaint mode
};


SplitBackgroundAndOverlay: PUBLIC PROC [ggData: GGData, restoreBox: BoundBox] = {
PaintAllButOverlayed: PROC = {
GGBoundBox.EraseWithinBoundBox[backgroundContext, restoreBox];
DrawObjectsFiltered[dc: backgroundContext, ggData: ggData, filter: restoreBox, excludeOverlay: TRUE, overObject: NIL];
};
backgroundContext: Imager.Context;
IF ggData.refresh.suppressRefresh THEN RETURN;
backgroundContext _ BufferedRefresh.GetLayerContext[ggData.refresh.sandwich, $Background];
Imager.DoSaveAll[backgroundContext, PaintAllButOverlayed];
}; -- end StoreBackground

PaintDragOverlay: PROC [screen: Imager.Context, ggData: GGData, dragInProgress: BOOL, showColors: BOOL] = {
clientToViewer, viewerToClient: Imager.Transformation;
ggData.refresh.dragInProgress _ dragInProgress;
ggData.refresh.caretIsMoving _ TRUE;
[clientToViewer, viewerToClient] _ BiScrollers.GetStyle[].GetTransforms[BiScrollers.QuaBiScroller[ggData.actionArea]];
BufferedRefresh.DrawSandwich[ggData.refresh.sandwich, screen, clientToViewer, viewerToClient, ggData, showColors];
};

FinishedAdding: PROC [screen: Imager.Context, ggData: GGData, showColors: BOOL] = {
MergeBackgroundAndOverlay[ggData, ggData.refresh.startBoundBox, FALSE, ggData.refresh.addedObject, showColors];
PaintAllPlanes[screen, ggData, showColors, FALSE, FALSE];
};

BackmostSelectedSlice: PROC [scene: Scene] RETURNS [backmost: REF ANY] = {
entityGen: GGModelTypes.EntityGenerator;
entityGen _ GGScene.TopLevelEntitiesInScene[scene];
FOR entity: REF ANY _ GGScene.NextEntity[entityGen], GGScene.NextEntity[entityGen] UNTIL entity = NIL DO
WITH entity SELECT FROM
outline: Outline => {
outD: OutlineDescriptor _ GGSelect.FindSelectedOutline[outline, scene, normal];
IF outD # NIL THEN RETURN[outline];
};
slice: Slice => {
sliceD: SliceDescriptor _ GGSelect.FindSelectedSlice[slice, scene, normal];
IF sliceD # NIL THEN RETURN[slice];
};
ENDCASE => ERROR;
ENDLOOP;
RETURN[NIL];
};

FinishedDragging: PROC [screen: Imager.Context, ggData: GGData, showColors: BOOL] = {
overObject: REF ANY _ BackmostSelectedSlice[ggData.scene];
GGBoundBox.EnlargeByBox[ggData.refresh.startBoundBox, GGBoundBox.BoundBoxOfMoving[ggData.scene]];
MergeBackgroundAndOverlay[ggData, ggData.refresh.startBoundBox, FALSE, overObject, showColors];
PaintAllPlanes[screen, ggData, showColors, FALSE, FALSE];
};

MergeBackgroundAndOverlay: PROC [ggData: GGData, bBox: BoundBox, eraseFirst: BOOL _ FALSE, overObject: REF ANY, showColors: BOOL] = {
backgroundContext: Imager.Context _ BufferedRefresh.GetLayerContext[ggData.refresh.sandwich, $Background];
MergeBackgroundAndOverlayAux: PROC = {
IF eraseFirst THEN GGBoundBox.EraseWithinBoundBox[backgroundContext, bBox];
DrawObjectsFiltered[dc: backgroundContext, ggData: ggData, filter: bBox, overObject: overObject];
};
IF ggData.refresh.suppressRefresh THEN RETURN;
IF NOT showColors THEN {
Imager.DoSaveAll[backgroundContext, MergeBackgroundAndOverlayAux];
BufferedRefresh.SetLayerOK[ggData.refresh.sandwich, $Background, TRUE];
};
};

DrawObjects: PROC [screen: Imager.Context, ggData: GGData] = {
scene: Scene _ ggData.scene;
camera: CameraData _ ggData.camera;
entityGen: EntityGenerator;

Imager.SetColor[screen, Imager.black];
entityGen _ GGScene.TopLevelEntitiesInScene[scene];
FOR entity: REF ANY _ GGScene.NextEntity[entityGen], GGScene.NextEntity[entityGen] UNTIL entity = NIL DO
WITH entity SELECT FROM
outline: Outline => outline.class.drawParts[outline, NIL, screen, camera, FALSE];
slice: Slice => slice.class.drawParts[slice, NIL, screen, camera, FALSE];
ENDCASE => ERROR;
ENDLOOP;
};

DrawObjectsFiltered: PROC [dc: Imager.Context, ggData: GGData, filter: GGBoundBox.BoundBox, excludeOverlay: BOOL _ FALSE, overObject: REF ANY] = {
OutsideOf: PROC [test, bound: GGBoundBox.BoundBox] RETURNS [BOOL] = {
RETURN[ test.hiX < bound.loX OR test.loX > bound.hiX OR test.hiY < bound.loY OR test.loY > bound.hiY ]; -- these tests may have to be <= or >=
};
DrawObjectsFilteredAux: PROC = { -- need to clip to filter, then image
entityGen: EntityGenerator _ GGScene.TopLevelEntitiesInScene[scene];
thisEntity: REF ANY _ GGScene.NextEntity[entityGen];
IF overObject # NIL THEN {
UNTIL thisEntity = overObject OR thisEntity = NIL DO thisEntity _ GGScene.NextEntity[entityGen] ENDLOOP;
IF thisEntity = NIL THEN RETURN;
};
Imager.SetColor[dc, Imager.black];
GGBoundBox.Clip[dc: dc, bBox: filter];
FOR entity: REF ANY _ thisEntity, GGScene.NextEntity[entityGen] UNTIL entity = NIL DO
WITH entity SELECT FROM
outline: Outline => {
IF excludeOverlay AND outline.onOverlay THEN LOOP;
IF NOT OutsideOf[outline.class.getBoundBox[outline, NIL], filter] THEN outline.class.drawParts[outline, NIL, dc, camera, FALSE];
};
slice: Slice => {
IF excludeOverlay AND slice.onOverlay THEN LOOP;
IF NOT OutsideOf[slice.class.getBoundBox[slice, NIL], filter] THEN slice.class.drawParts[slice, NIL, dc, camera, FALSE];
};
ENDCASE => ERROR;
ENDLOOP;
};
scene: Scene _ ggData.scene;
camera: CameraData _ ggData.camera;
IF filter=NIL OR filter.null THEN RETURN;
Imager.DoSaveAll[dc, DrawObjectsFilteredAux];
};

DrawCaret: PROC [dc: Imager.Context, caret: Caret, color: Imager.Color] = {
caretPos: Point _ GGCaret.GetPoint[caret];
IF NOT GGCaret.Exists[caret] THEN RETURN;
Imager.SetColor[dc, color];
GGShapes.DrawCaret[dc, caretPos];
};

DrawAnchor: PROC [dc: Imager.Context, caret: Caret, color: Imager.Color] = {
caretPos: Point _ GGCaret.GetPoint[caret];
IF NOT GGCaret.Exists[caret] THEN RETURN;
Imager.SetColor[dc, color];
GGShapes.DrawAnchor[dc, caretPos];
};


DrawNewAnchor: PROC [dc: Imager.Context, ggData: GGData] = {
anchorPos: Point _ GGCaret.GetPoint[ggData.anchor];
Imager.SetColor[dc, Imager.black];
GGShapes.DrawAnchor[dc, anchorPos];
};

PaintSpot: PROC [dc: Imager.Context, ggData: GGData] = {
IF ggData.refresh.suppressRefresh THEN RETURN;
Imager.SetColor[dc, Imager.black];
GGShapes.DrawSpot[dc, ggData.refresh.spotPoint];
};

PaintHitLine: PROC [dc: Imager.Context, ggData: GGData] = {
IF ggData.refresh.suppressRefresh THEN RETURN;
Imager.SetColor[dc, Imager.black];
Imager.SetStrokeEnd[dc, round];
Imager.MaskVector[dc, [ggData.refresh.spotPoint.x, ggData.refresh.spotPoint.y], [ggData.refresh.hitPoint.x, ggData.refresh.hitPoint.y]];
GGShapes.DrawFilledRect[dc, ggData.refresh.spotPoint, 3.0];
};

PaintOddHitLine: PROC [dc: Imager.Context, ggData: GGData] = {
IF ggData.refresh.suppressRefresh THEN RETURN;
Imager.SetColor[dc, Imager.black];
Imager.SetStrokeEnd[dc, round];
Imager.MaskVector[dc, [ggData.refresh.spotPoint.x, ggData.refresh.spotPoint.y], [ggData.refresh.hitPoint.x, ggData.refresh.hitPoint.y]];
GGShapes.DrawCP[dc, ggData.refresh.spotPoint];
};


PaintAlign: PROC [dc: Imager.Context, ggData: GGData] = {
IF ggData.refresh.suppressRefresh THEN RETURN;
GGGravity.DrawAlignBagRegardless[dc, NARROW[ggData.hitTest.alignBag], ggData];
};

PaintBoundBoxes: PROC [dc: Imager.Context, ggData: GGData] = {
bBoxGen: BoundBoxGenerator;
PaintBoundBoxesAux: PROC = {
bBoxGen _ GGScene.BoundBoxesInScene[ggData.scene];
FOR box: BoundBox _ GGScene.NextBox[bBoxGen], GGScene.NextBox[bBoxGen] UNTIL box = NIL DO
GGBoundBox.DrawBoundBox[dc, box];
ENDLOOP;
};
IF ggData.refresh.suppressRefresh THEN RETURN;
Imager.DoSaveAll[dc, PaintBoundBoxesAux];
};

PaintTightBoxes: PROC [dc: Imager.Context, ggData: GGData] = {
box: BoundBox;
PaintTightBoxesAux: PROC = {
entityGen: GGModelTypes.EntityGenerator;
entityGen _ GGSelect.SelectedStuff[ggData.scene, normal];
FOR entity: REF ANY _ GGScene.NextEntity[entityGen], GGScene.NextEntity[entityGen] UNTIL entity = NIL DO
WITH entity SELECT FROM
sliceD: SliceDescriptor => {
box _ sliceD.slice.class.getTightBox[sliceD.slice, sliceD.parts];
};
outlineD: OutlineDescriptor => {
box _ outlineD.slice.class.getTightBox[outlineD.slice, outlineD.parts];
};
ENDCASE => ERROR;
GGBoundBox.DrawBoundBox[dc, box];
ENDLOOP;
};
IF ggData.refresh.suppressRefresh THEN RETURN;
Imager.DoSaveAll[dc, PaintTightBoxesAux];
};

PaintOutlineBoxes: PROC [dc: Imager.Context, ggData: GGData] = {
PaintBoundBoxesAux: PROC = {
outSeqGen: GGSelect.OutlineSequenceGenerator;
bBox: BoundBox;
outSeqGen _ GGSelect.SelectedOutlineSequences[ggData.scene, normal];
FOR outSeq: GGSelect.OutlineSequence _ GGSelect.NextOutlineSequences[outSeqGen], GGSelect.NextOutlineSequences[outSeqGen] UNTIL outSeq = NIL DO
IF outSeq.fenceSeq # NIL THEN {
bBox _ GGTraj.GetBoundBox[outSeq.fenceSeq.traj];
GGBoundBox.DrawBoundBox[dc, bBox];
};
FOR holeSeq: Sequence _ GGSequence.NextSequence[outSeq.holeSeqs], GGSequence.NextSequence[outSeq.holeSeqs] UNTIL holeSeq = NIL DO
bBox _ GGTraj.GetBoundBox[holeSeq.traj];
GGBoundBox.DrawBoundBox[dc, bBox];
ENDLOOP;
ENDLOOP;
};
IF ggData.refresh.suppressRefresh THEN RETURN;
Imager.DoSaveAll[dc, PaintBoundBoxesAux];
};

PaintSelectionBox: PUBLIC PROC [dc: Imager.Context, ggData: GGData] = {
box: BoundBox _ NIL;
PaintSelectionBoxAux: PROC = {
box _ GGBoundBox.BoundBoxOfSelected[ggData.scene];
IF NOT box.null THEN GGBoundBox.DrawBoundBox[dc, box];
};
IF ggData.refresh.suppressRefresh THEN RETURN;
Imager.DoSaveAll[dc, PaintSelectionBoxAux];
};

GetOutlineParts: PROC [sliceD: OutlineDescriptor, atom: ATOM] RETURNS [parts: OutlineDescriptor] = {
parts _ SELECT atom FROM
$DrawBackgroundBox => sliceD.slice.class.movingParts[sliceD.slice, sliceD.parts].background,
$DrawOverlayBox => sliceD.slice.class.movingParts[sliceD.slice, sliceD.parts].overlay,
$DrawRubberBox => sliceD.slice.class.movingParts[sliceD.slice, sliceD.parts].rubber,
$DrawDragBox => sliceD.slice.class.movingParts[sliceD.slice, sliceD.parts].drag,
ENDCASE => ERROR;
};
GetSliceParts: PROC [sliceD: SliceDescriptor, atom: ATOM] RETURNS [parts: SliceDescriptor] = {
parts _ SELECT atom FROM
$DrawBackgroundBox => sliceD.slice.class.movingParts[sliceD.slice, sliceD.parts].background,
$DrawOverlayBox => sliceD.slice.class.movingParts[sliceD.slice, sliceD.parts].overlay,
$DrawRubberBox => sliceD.slice.class.movingParts[sliceD.slice, sliceD.parts].rubber,
$DrawDragBox => sliceD.slice.class.movingParts[sliceD.slice, sliceD.parts].drag,
ENDCASE => ERROR;
};


DrawMovingBox: PUBLIC PROC [dc: Imager.Context, ggData: GGData, atom: ATOM] = {
OutlineEnlargeBox: PROC [outlineD: OutlineDescriptor] = {
thisBox: BoundBox;
theseParts: OutlineDescriptor;
theseParts _ GetOutlineParts[outlineD, atom];
IF theseParts.parts = NIL THEN thisBox _ GGBoundBox.NullBoundBox[]
ELSE thisBox _ outlineD.slice.class.getBoundBox[outlineD.slice, theseParts.parts];
GGBoundBox.EnlargeByBox[bBox: box, by: thisBox];
};
SliceEnlargeBox: PROC [sliceD: SliceDescriptor] = {
thisBox: BoundBox;
theseParts: SliceDescriptor;
theseParts _ GetSliceParts[sliceD, atom];
IF theseParts.parts = NIL THEN thisBox _ GGBoundBox.NullBoundBox[]
ELSE thisBox _ sliceD.slice.class.getBoundBox[sliceD.slice, theseParts.parts];
GGBoundBox.EnlargeByBox[bBox: box, by: thisBox];
};
box: BoundBox _ GGBoundBox.NullBoundBox[];
IF ggData.refresh.suppressRefresh THEN RETURN;
GGSelect.DoForEachSelectedOutline[ggData.scene, normal, OutlineEnlargeBox];
GGSelect.DoForEachSelectedSlice[ggData.scene, normal, SliceEnlargeBox];
IF NOT box.null THEN GGBoundBox.DrawBoundBox[dc, box];
};

EraseAll: PROC [dc: Imager.Context] = {
rect: Imager.Rectangle;
rect _ ImagerBackdoor.GetBounds[dc];
Imager.SetColor[dc, Imager.white];
Imager.MaskRectangle[dc, rect];
};


EndFourPoints: PROC [traj: Traj] RETURNS [firstPoint, secondPoint, secondToLastPoint, lastPoint: Point, firstWidth, lastWidth: REAL] = {
seg: Segment;
cpCount: NAT;
seg _ GGTraj.FetchSegment[traj, 0];
firstWidth _ seg.strokeWidth;
firstPoint _ seg.lo;
cpCount _ seg.class.controlPointCount[seg];
IF cpCount > 0 THEN {
secondPoint _ seg.class.controlPointGet[seg, 0];
}
ELSE {
secondPoint _ seg.hi;
};
seg _ GGTraj.FetchSegment[traj, GGTraj.HiSegment[traj]];
lastWidth _ seg.strokeWidth;
lastPoint _ seg.hi;
cpCount _ seg.class.controlPointCount[seg];
IF cpCount > 0 THEN {
secondToLastPoint _ seg.class.controlPointGet[seg, cpCount-1];
}
ELSE {
secondToLastPoint _ seg.lo;
};
};

ExcludeArrows: PROC [dc: Imager.Context, traj: Traj] = {
OPEN Vectors2d;
ClipPath: Imager.PathProc = {
moveTo[Add[Add[tip, Scale[perp, -halfWidth]], Scale[axis, thisWidth/2.0]]];
lineTo[Add[Add[tip, Scale[perp, halfWidth]], Scale[axis, thisWidth/2.0]]];
lineTo[Sub[tip, Add[Scale[axis, height], Scale[perp, halfWidth]]]];
lineTo[Sub[tip, Add[Scale[axis, height], Scale[perp, -halfWidth]]]];
lineTo[Add[tip, Scale[perp, -halfWidth]]];
};
firstPoint, secondPoint, secondToLastPoint, lastPoint, tip, base: Point;
firstWidth, lastWidth, thisWidth, height, halfWidth: REAL;
axis, perp: Vector;

IF NOT traj.loArrow AND NOT traj.hiArrow THEN RETURN;
[firstPoint, secondPoint, secondToLastPoint, lastPoint, firstWidth, lastWidth] _ EndFourPoints[traj];
IF traj.loArrow THEN {
thisWidth _ firstWidth;
[height, halfWidth] _ GGShapes.ArrowSize[thisWidth];
tip _ firstPoint;
base _ secondPoint;
axis _ Vectors2d.Normalize[Vectors2d.Sub[tip, base]];
perp _ [axis.y, -axis.x];
Imager.Clip[dc, ClipPath, FALSE, TRUE];
};
IF traj.hiArrow THEN {
thisWidth _ lastWidth;
[height, halfWidth] _ GGShapes.ArrowSize[thisWidth];
tip _ lastPoint;
base _ secondToLastPoint;
axis _ Vectors2d.Normalize[Vectors2d.Sub[tip, base]];
perp _ [axis.y, -axis.x];
Imager.Clip[dc, ClipPath, FALSE, TRUE];
};
};


DrawArrows: PROC [dc: Imager.Context, traj: Traj, ggData: GGData] = {
firstPoint, secondPoint, secondToLastPoint, lastPoint: Point;
firstWidth, lastWidth: REAL;
IF NOT traj.loArrow AND NOT traj.hiArrow THEN RETURN;
[firstPoint, secondPoint, secondToLastPoint, lastPoint, firstWidth, lastWidth] _ EndFourPoints[traj];
IF traj.loArrow THEN GGShapes.DrawArrow[dc, firstPoint, secondPoint, firstWidth];
IF traj.hiArrow THEN GGShapes.DrawArrow[dc, lastPoint, secondToLastPoint, lastWidth];
};



DrawJoints: PROC [dc: Imager.Context, traj: Traj, ggData: GGData]  = {
IF ggData.camera.quality = quality OR traj.parent.onOverlay THEN RETURN;
IF NOT traj.visibleJoints THEN RETURN;
Imager.SetColor[dc, Imager.black];
FOR i: INT IN [0..GGTraj.HiJoint[traj]] DO
GGShapes.DrawJoint[dc, GGTraj.FetchJointPos[traj, i]];
ENDLOOP;
};

DrawJointsInSequenceFeedback: PROC [dc: Imager.Context, seq: Sequence, ggData: GGData, selectClass: SelectionClass _ normal]  = {
jointGen: JointGenerator;
IF ggData.camera.quality = quality THEN RETURN;
Imager.SetColor[dc, Imager.black];
jointGen _ GGSequence.JointsInSequence[seq];
FOR i: INT _ GGSequence.NextJoint[jointGen], GGSequence.NextJoint[jointGen] UNTIL i = -1 DO
GGShapes.DrawSelectedJoint[dc, GGTraj.FetchJointPos[seq.traj, i], selectClass];
ENDLOOP;
};

SnapShot: PUBLIC PROC [dc: Imager.Context, ggData: GGData] = {
boundRect: Rectangle _ ImagerBackdoor.GetBounds[dc];
SnapshotBackground[dc, ggData];
RefreshOverlay[dc, boundRect, ggData];
};

SnapshotBackground: PROC [dc: Imager.Context, ggData: GGData] = {
scene: Scene _ ggData.scene;
camera: CameraData _ ggData.camera;
entityGen: EntityGenerator;
Imager.SetColor[dc, Imager.black];
entityGen _ GGScene.TopLevelEntitiesInScene[ggData.scene];
FOR entity: REF ANY _ GGScene.NextEntity[entityGen], GGScene.NextEntity[entityGen] UNTIL entity = NIL DO
WITH entity SELECT FROM
outline: Outline => {
IF OnOverlay[outline, ggData] THEN LOOP
ELSE outline.class.drawParts[outline, NIL, dc, camera, FALSE];
};
slice: Slice => {
IF OnOverlay[slice, ggData] THEN LOOP
ELSE slice.class.drawParts[slice, NIL, dc, camera, FALSE];
};
ENDCASE => ERROR;
ENDLOOP;
IF NOT OnOverlay[ggData.caret, ggData] THEN DrawCaret[dc, ggData.caret, Imager.black];
DrawAnchor[dc, ggData.anchor, Imager.black];
GGGravity.DrawAlignBagRegardless[dc, NARROW[ggData.hitTest.alignBag], ggData];
};

InterpressEntireScene: PUBLIC PROC [dc: Imager.Context, ggData: GGData] = {
DrawObjects[dc, ggData];
};

MoveToOverlay: PUBLIC PROC [entity: REF ANY, ggData: GGData] = {
WITH entity SELECT FROM
caret: Caret => {
IF OnOverlay[caret, ggData] THEN ERROR;
GGCaret.TellOnOverlay[caret, TRUE];
ggData.refresh.overlayList _ List.Nconc[LIST[caret], ggData.refresh.overlayList];
};
outlineD: OutlineDescriptor => {
IF OnOverlay[outlineD, ggData] THEN ERROR;
outlineD.slice.onOverlay _ TRUE;
ggData.refresh.overlayList _ List.Nconc[LIST[outlineD], ggData.refresh.overlayList];
};
sliceD: SliceDescriptor => {
IF OnOverlay[sliceD, ggData] THEN ERROR;
sliceD.slice.onOverlay _ TRUE;
ggData.refresh.overlayList _ List.Nconc[LIST[sliceD], ggData.refresh.overlayList];
};
ENDCASE => ERROR;
ggData.refresh.orderedOverlayList _ NIL;
};

MoveAllSelectedToOverlay: PUBLIC PROC [ggData: GGData, selectClass: SelectionClass] = {
entityGen: EntityGenerator _ GGSelect.SelectedStuff[ggData.scene, selectClass];
FOR entity: REF ANY _ GGScene.NextEntity[entityGen], GGScene.NextEntity[entityGen] UNTIL entity = NIL DO
MoveToOverlay[entity, ggData];
ENDLOOP;
};

MoveToBackground: PUBLIC PROC [entity: REF ANY, ggData: GGData] = {
IF NOT OnOverlay[entity, ggData] THEN RETURN;
ggData.refresh.overlayList _ List.DRemove[entity, ggData.refresh.overlayList];
WITH entity SELECT FROM
sliceD: SliceDescriptor => sliceD.slice.onOverlay _ FALSE;
outline: Outline => outline.onOverlay _ FALSE;
caret: Caret => GGCaret.TellOnOverlay[caret, FALSE];
ENDCASE => ERROR;
ggData.refresh.orderedOverlayList _ NIL;
};

MoveOverlayToBackground: PUBLIC PROC [ggData: GGData] = {
FOR overlayList: LIST OF REF ANY _ ggData.refresh.overlayList, overlayList.rest UNTIL overlayList = NIL DO
WITH overlayList.first SELECT FROM
sliceD: SliceDescriptor => sliceD.slice.onOverlay _ FALSE;
outlineD: OutlineDescriptor => outlineD.slice.onOverlay _ FALSE;
caret: Caret => GGCaret.TellOnOverlay[caret, FALSE];
ENDCASE => ERROR;
ENDLOOP;
ggData.refresh.overlayList _ NIL;
ggData.refresh.orderedOverlayList _ NIL;
};

EmptyOverlay: PUBLIC PROC [ggData: GGData] RETURNS [BOOL] = {
RETURN[ggData.refresh.overlayList = NIL];
};

OnOverlay: PROC [entity: REF ANY, ggData: GGData] RETURNS [BOOL] = {
WITH entity SELECT FROM
caret: Caret => RETURN[GGCaret.IsOnOverlay[caret]];
outline: Outline => RETURN[outline.onOverlay];
slice: Slice => RETURN[slice.onOverlay];
sliceD: SliceDescriptor => RETURN[sliceD.slice.onOverlay];
outlineD: OutlineDescriptor => RETURN[outlineD.slice.onOverlay];
ENDCASE => ERROR;
};

OrderOverlayList: PROC [ggData: GGData] RETURNS [orderedList: LIST OF REF ANY _ NIL] = {
FindOverlayedD: PROC [slice: REF ANY] RETURNS [sliceD: REF ANY _ NIL] = {
FOR ov: LIST OF REF ANY _ ggData.refresh.overlayList, ov.rest UNTIL ov=NIL DO
WITH ov.first SELECT FROM
sliceD: SliceDescriptor => IF sliceD.slice=slice THEN RETURN[ov.first];
outlineD: OutlineDescriptor => IF outlineD.slice=slice THEN RETURN[ov.first];
ENDCASE => ERROR;
ENDLOOP;
RETURN[NIL];
};
sliceD: REF ANY;
finger: LIST OF REF ANY;
entityGen: EntityGenerator;
[orderedList, finger] _ GGUtility.StartList[];
entityGen _ GGScene.TopLevelEntitiesInScene[ggData.scene];
FOR entity: REF ANY _ GGScene.NextEntity[entityGen], GGScene.NextEntity[entityGen] UNTIL entity = NIL DO
IF OnOverlay[entity, ggData] THEN {
WITH entity SELECT FROM
outline: Outline => { -- scene entity is identical to overlay entity
sliceD _ FindOverlayedD[entity];
IF sliceD = NIL THEN sliceD _ outline.class.newParts[outline, NIL, topLevel];
[orderedList, finger] _ GGUtility.AddEntity[sliceD, orderedList, finger];
};
slice: Slice => {
sliceD _ FindOverlayedD[entity];
IF sliceD = NIL THEN sliceD _ slice.class.newParts[slice, NIL, topLevel];
[orderedList, finger] _ GGUtility.AddEntity[sliceD, orderedList, finger];
};
ENDCASE => ERROR;
};
ENDLOOP;
IF OnOverlay[ggData.caret, ggData] THEN [orderedList, finger] _ GGUtility.AddEntity[ggData.caret, orderedList, finger];
};

AdjustContextForDrawBits: PROC [dc: Imager.Context, ggData: GGData] = {
viewerToClient: Imager.Transformation _ BiScrollers.GetStyle[].GetTransforms[BiScrollers.QuaBiScroller[ggData.actionArea]].viewerToClient;
Imager.ConcatT[dc, viewerToClient];
};

InitStats: PROC [] = {
interval: CodeTimer.Interval;
interval _ CodeTimer.CreateInterval[$PaintEntireScene];
CodeTimer.AddInt[interval, $Gargoyle];
};

InitStats[];

END.
GGRefreshImpl.mesa 
Copyright c 1985 by Xerox Corporation.  All rights reserved.
Contents:  All painting actions in Gargoyle are called thru this interface.
Last edited by Bier on April 16, 1987 12:02:52 pm PDT
Pier, March 25, 1987 3:50:04 pm PST
Kurlander August 28, 1986 7:11:40 pm PDT

whatHasChanged will be an atom describing some change which has occurred to the viewable scene state, such as $CaretMoved, $OverlayMoved, $ObjectAdded, $SelectionChanged, or $Everything.  A pointer to the particular objects to be repainted will be stored in ggData for now.
We envision a scheme where Dispatch may actually queue up painting jobs and attempt optimizations on the queue.  In this case, the objects to be repainted will have to be stored separately from the ggData.

The Sixteen Types of Scene Change:
Dragging
Debugging
 [Artwork node; type 'ArtworkInterpress on' to command tool] 
clientToViewer _ ImagerTransformation.Invert[viewerToClient];

Single-Plane Commands

This could use some optimizing.
No Imager.DoSaveAll is used.  This procedure sets the color to black.
Add these new features to the foreground context.
Repaint all of the alignment lines.  Use the FunctionCache to avoid drawing what has already been drawn.
Drawing Utilities
Draws control points on slices which are the caret attractor
Puts all the selected (hot & normal) outlines in a list, and returns them
Puts all the selected (hot & normal) slices in a list, and returns them
WhoCaresIfChairIsAttractor: PROC [ggData: GGData] RETURNS [attOn: GGInterfaceTypes.CaretOn, attractor: REF ANY, attJointNum: NAT, attSeg: Segment] = {
For now, I'm going to allow highlighting of moving objects.  You only live once.  Eric.  Note:  this procedure fixes a bug with ChairIsNotAttractor.  Namely, highlighting does not occur with ChairIsNotAttractor when the caret is positioned on a selected segment.
[attractor: attractor, on: attOn, jointNum: attJointNum, seg: attSeg] _ GGCaret.GetAttractor[ggData.caret];
WITH attractor SELECT FROM
oSliceD: OutlineDescriptor => {};
aSliceD: SliceDescriptor => {};
ENDCASE => attOn _ nothing; 
};

ChairIsNotAttractor: PROC [ggData: GGData] RETURNS [attOn: GGInterfaceTypes.CaretOn, attractor: REF ANY, attJointNum: NAT, attSeg: Segment] = {
This code figures out if the chair and the attractor are "identical" in a bunch of weird cases. It returns on=nothing if they are "identical" and returns the attractor data if not "identical".
This is the wrong question to ask.  The right thing to do is to take those objects that the caret is attracted to, and subtract away any parts that are moving.  -- Bier, December 16, 1986.
chair: REF ANY;
chairOn: GGInterfaceTypes.CaretOn;
attSegNum, chairJointNum, chairSegNum: NAT;
chairSeg: Segment;
[attractor: attractor, on: attOn, jointNum: attJointNum, seg: attSeg, segNum: attSegNum] _ GGCaret.GetAttractor[ggData.caret];
[chair: chair, on: chairOn, jointNum: chairJointNum, segNum: chairSegNum, seg: chairSeg] _ GGCaret.GetChair[ggData.caret];
WITH attractor SELECT FROM
aTraj: Traj => {
attSeg1, attSeg2, chairSeg1, chairSeg2: NAT;
IF chair#attractor THEN RETURN; -- return attractor information
attractor and chair are the same traj
IF attOn=joint THEN {
IF GGTraj.IsEndJoint[aTraj, attJointNum] THEN attSeg2 _ attSeg1 _ IF attJointNum=0 THEN 0 ELSE attJointNum-1 -- open traj, end joint
ELSE { -- closed traj or not end joint
attSeg1 _ attJointNum;
attSeg2 _ GGTraj.PreviousSegmentNum[aTraj, attJointNum];
};
}
ELSE IF attOn=seg OR attOn=cp THEN attSeg2 _ attSeg1 _ attSegNum;
IF chairOn=joint THEN {
IF GGTraj.IsEndJoint[aTraj, chairJointNum] THEN chairSeg2 _ chairSeg1 _ IF chairJointNum=0 THEN 0 ELSE chairJointNum-1 -- open traj, end joint
ELSE { -- closed traj or not end joint
chairSeg1 _ chairJointNum;
chairSeg2 _ GGTraj.PreviousSegmentNum[aTraj, chairJointNum];
};
}
ELSE IF chairOn=seg OR chairOn=cp THEN chairSeg2 _ chairSeg1 _ chairSegNum;
IF attSeg1=chairSeg1 OR attSeg2=chairSeg1 OR attSeg1=chairSeg2 OR attSeg2=chairSeg2  THEN attOn _ nothing;
};
aSliceD: SliceDescriptor => { -- if slices are the same (don't user parts) then chair=attractor
WITH chair SELECT FROM
chairSliceD: SliceDescriptor => IF aSliceD.slice=chairSliceD.slice THEN attOn _ nothing;
ENDCASE;
};
ENDCASE => attOn _ nothing; 
};


Repairing Various Planes

The selected objects have changed in some small way (e.g. line width or color).  Repair the background plane and refresh the screen.
An object has been added to the scene, or has changed size or shape in a simple way.  All of the changes are confined to the box ggData.refresh.startBoundBox.  Repair the background plane and refresh the screen.
An object has been added to the scene.  All of the changes are confined to the box ggData.refresh.startBoundBox.  Repair the background plane and refresh the screen.  Since this is an addition, we only need to draw the objects which are over (in overlap order) the new shape (usually there aren't any).
Dynamic

The background has split into two parts: background and overlay.  Remove any overlay objects from the background plane.  Also, a dragging operation is about to start, so mark the foregroundBitmap as obsolete.
This routine is called DuringDrag. Write the overlay shapes, selection feedback, and the foreground shapes onto the chunking bitmap and then dump the chunking bitmap onto the screen.  The result is double-buffered motion.
The boundBox describes the region of the background which must be updated from the overlay.
The background and overlay planes are about to be recombined into the background plane, after dragging.
Drawing Routines which are independent of refresh strategy.

The common core of PaintEntireScene and InterpressEntireScene.
Paints those objects in the scene within the filter bounding box, and in front of (and including) overObject (in PriorityOrder) into the display context.

Debugging
Imager.SetColor[dc, ImagerColor.ColorFromGray[0.5]];
Draw the boxes.
Draw the boxes.
Draw the boxes.
Draw the box.

Drawing Arrows
Drawing Feedback
Let Q be a logical variable corresponding to (ggData.camera.quality = quality).
Let S correspond to (joint J is selected).
Let V correspond to (joint J is marked as visible).
Let O correspond to (joint J is on the overlay plane).
Then joint J is drawn filled when:  qSo.
Joint J is drawn unfilled when qsVo.
Suppress joints for an interpress master and for dragging.
Suppress joints for an interpress master.

For Interpress Masters
Called by GGMouseEvent.IPSnapShot to get a picture of Gargoyle dragging in action.
Draw all but the overlay objects into a bitmap.  Auxiliary for SnapShot.
Draw most of the scene.
Worry about scene objects.
Worry about the caret.
Worry about alignment lines.

The Overlay Plane

traverse the scene.entities from back to end front.
Scene may have: outline, slice
Overlay may have: OutlineDescriptor, SliceDescriptor, caret

Utility
this procedure is needed to map the chunking and background bitmaps onto the actual viewer area before DrawBits is called.
Changed the names of some of the procedures and wrote down some conventions which may help us think about them (See comments in ActionAreaPaint). Added atom $DrawCaret for the special case $PaintSelectedRegion would be wasteful because nothing in that region has changed (see GGMouseEventImpl.EndCaretPos).
Bier, April 30, 1986 6:15:58 pm PDT:  Deleted some commented out code.  Thanks, Ken, for getting rid of the DrawSegArray stuff.
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