GraphUtilImpl.mesa, Copyright Ó 1985, 1987 by Xerox Corporation. All rights reserved.
Last Edited by:
Christian Le Cocq April 27, 1987 6:24:41 pm PDT
Sweetsun Chen, November 26, 1985 12:43:59 pm PST
DIRECTORY
Buttons USING [Button, SetDisplayStyle],
Convert USING [BoolFromRope, Error, IntFromRope, RealFromRope, RopeFromInt, RopeFromReal],
FS USING [Error, ComponentPositions, ExpandName],
Graph USING [BackgroundIndex, CaretIndex, CaretSpecRec, CaretStateRec, Chart, ChartRec, ColorIndex, Controller, Entity, EntityGroup, EntityGroupList, EntityHash, EntityHashArray, EntityHashSize, EntityList, FontArray, FontIndex, GRAPH, GraphColorsArray, GraphFont, GraphFontsArray, GraphHandle, GraphHandleRec, GraphRec, NestedEntities, NullRect, NullVec, OutputType, ROPE, SegmentDataList, SegmentData, SegmentDataRec, TargetSpecRec, Text, Texts, ValueList, Viewer, XY],
GraphCleanUp USING [CleanUpEL, CleanUpSDL, CleanUpTexts, CleanUpVL],
GraphOps USING [Black, DarkGray, Gray, White],
GraphPrivate USING [defaultColors, defaultFonts, IsController, IsGraphViewer, systemColor],
GraphUtil,
Imager USING [Box, ConstantColor, Rectangle, VEC],
ImagerColor USING [RGB, ColorFromRGB, ConstantColor],
ImagerColorMap USING [LoadEntries, MapEntry, SetStandardColorMap],
ImagerDitherContext USING [MakeSpecialColor],
ImagerFont USING [Extents, Font, FontBoundingBox, RopeBoundingBox],
IO USING [int, PutFR],
MessageWindow USING [Append, Blink],
Process USING [MsecToTicks, SetTimeout],
Real USING [Float, LargestNumber, RealException, InlineRoundC, InlineRoundI],
RealFns USING [SqRt],
Rope USING [Cat, Concat, IsEmpty, Substr],
Terminal USING [ColorCursorPresentation, Current, GetColorCursorPresentation, SetColorCursorPresentation, Virtual],
UserProfile USING [ListOfTokens],
VFonts USING [EstablishFont],
ViewerOps USING [FetchProp],
ViewerTools USING [GetContents, GetSelectionContents, SetContents],
WindowManager USING [RestoreCursor];
GraphUtilImpl: CEDAR PROGRAM
IMPORTS Buttons, Convert, FS, GraphCleanUp, GraphPrivate, GraphUtil, ImagerColor, ImagerColorMap, ImagerDitherContext, ImagerFont, IO, MessageWindow, Process, Real, RealFns, Rope, Terminal, UserProfile, VFonts, ViewerOps, ViewerTools, WindowManager
EXPORTS Graph, GraphUtil = { OPEN Graph, GraphPrivate, GraphUtil;
error checking
Error: PUBLIC SIGNAL[atom: ATOM, info: ROPE ← NIL]= CODE;
RaiseError: PUBLIC PROC[atom: ATOM, msg: ROPE ← NIL] = {
info: ROPE ← NilMessage[atom, msg];
IF info = NIL THEN info ← SELECT atom FROM
$NullBox => "Box = [0, 0, 0, 0]",
$BadBox => "xmin = xmax or ymin = ymax",
$UnknownInfo => "Unknown PaintInfo",
$UnknownAtom => "Unknown ATOM",
$Other => "Error",
ENDCASE => "Unknown error";
Error[atom, info];
}; -- RaiseError
BlinkMsg: PUBLIC PROC[msg: ROPE ← NIL] = {
MessageWindow.Blink[];
MessageWindow.Append[msg, TRUE];
}; -- BlinkMsg
NilMessage: PROC [atom: ATOM ← $Ref, msg: ROPE ← NIL] RETURNS [ROPE] = {
header: ROPE ← SELECT atom FROM
$NilViewer => "Viewer",
$NilHandle => "GraphHandle",
$NilChart => "Chart",
$NilController => "Controller",
$Ref => "REF",
ENDCASE => NIL;
IF header # NIL THEN header ← header.Concat[" is NIL"];
RETURN[IF msg = NIL THEN header ELSE Rope.Cat[header, " ", msg]];
}; -- NilMessage
CheckNil: PROC[ref: REF ANY ← NIL, atom: ATOM ← $Other, msg: ROPE ← NIL, degug: BOOL ← FALSE] RETURNS [ok: BOOL ← TRUE] = {
IF ref = nil and degug then raise error.
IF ref = NIL THEN {
ok ← FALSE;
IF degug THEN RaiseError[atom, msg] ELSE BlinkMsg[NilMessage[atom, msg]];
};
}; -- CheckNil
HandleNotNil: PUBLIC PROC[handle: GraphHandle ← NIL, msg: ROPE ← NIL, debug: BOOL ← FALSE] RETURNS [ok: BOOL ← TRUE] = {ok ← CheckNil[handle, $NilHandle, msg, debug]};
ChartNotNil: PUBLIC PROC[chart: Chart ← NIL, msg: ROPE ← NIL, debug: BOOL ← FALSE] RETURNS [ok: BOOL ← TRUE] = {ok ← CheckNil[chart, $NilChart, msg, debug]};
ViewerNotNil: PUBLIC PROC[viewer: Viewer ← NIL, msg: ROPE ← NIL, debug: BOOL ← FALSE] RETURNS [ok: BOOL ← TRUE] = {ok ← CheckNil[viewer, $NilViewer, msg, debug]};
GraphViewerExits: PUBLIC PROC [handle: GraphHandle, msg: ROPE ← NIL, debug: BOOL ← FALSE] RETURNS [ok: BOOL ← FALSE] = {
IF HandleNotNil[handle, msg, debug] THEN
IF ChartNotNil[handle.chart, msg, debug] THEN
IF ViewerNotNil[handle.chart.viewer, msg, debug] THEN ok ← TRUE;
}; -- GraphViewerExits
ControllerNotNil: PUBLIC PROC[c: Controller ← NIL, msg: ROPE ← NIL, debug: BOOL ← FALSE] RETURNS [ok: BOOL ← TRUE] = {ok ← CheckNil[c, $NilController, msg, debug]};
ControllerViewerExits: PUBLIC PROC [handle: GraphHandle ← NIL, msg: ROPE ← NIL, debug: BOOL ← FALSE] RETURNS [ok: BOOL ← FALSE] = {
IF HandleNotNil[handle, msg, debug] THEN
IF ControllerNotNil[handle.controller, msg, debug] THEN
IF ViewerNotNil[handle.controller.viewer, msg, debug] THEN ok ← TRUE;
}; -- GraphViewerExits
BoundsValid: PUBLIC PROC[box: Imager.Box] RETURNS [BOOL] = {
RETURN[box.xmax > box.xmin AND box.ymax > box.ymin]};
DivisionsValid: PUBLIC PROC[divX, divY: INT] RETURNS [BOOL] = {
RETURN[(divX IN [2..50]) AND (divY IN [2..50])]};
RectangleValid: PUBLIC PROC[rect: Imager.Rectangle ← NullRect] RETURNS [BOOL] = {
RETURN[rect.w > 0 AND rect.h > 0.0]};
colors & fonts
ColorValueOk: PUBLIC PROC[value: REAL ← 0.0, blinkMsg: BOOL ← TRUE] RETURNS [ok: BOOL ← TRUE] = {
IF value > 1.0 OR value < 0.0 THEN {
IF blinkMsg THEN BlinkMsg["Value must be in [0..1]."];
RETURN[FALSE];
};
}; -- ColorValueOk
ForegroundColor: PUBLIC PROC[background: BackgroundIndex ← white, output: OutputType ← screen] RETURNS [Imager.ConstantColor] ={
RETURN[IF output = interpress THEN systemColor[GraphOps.Black]
ELSE IF background = black OR background = darkGray THEN systemColor[GraphOps.White]
ELSE systemColor[GraphOps.Black]];
}; -- ForegroundColor
BackgroundColor: PUBLIC PROC[background: BackgroundIndex ← white, output: OutputType ← screen] RETURNS [Imager.ConstantColor] ={
RETURN[IF output = interpress THEN systemColor[GraphOps.White]
ELSE SELECT background FROM
gray => systemColor[GraphOps.Gray],
darkGray => systemColor[GraphOps.DarkGray],
black => systemColor[GraphOps.Black],
ENDCASE => systemColor[GraphOps.White]];
}; -- ForegroundColor
UseMyColors: PUBLIC PROC[handle: GraphHandle ← NIL] = {
IF HandleNotNil[handle] THEN FOR index: ColorIndex IN ColorIndex DO
systemColor[index] ← SetColor[index, handle.graph.color[index]];
ENDLOOP;
}; -- UseMyColors
SetColor: PUBLIC PROC[index: ColorIndex ← 0, rgb: ImagerColor.RGB ← [0, 0, 0]] RETURNS [ImagerColor.ConstantColor] = {
entry: ImagerColorMap.MapEntry ← [
mapIndex: index+100,
red: Real.InlineRoundC[rgb.R*255],
green: Real.InlineRoundC[rgb.G*255],
blue: Real.InlineRoundC[rgb.B*255]
];
ImagerColorMap.LoadEntries[
vt: Terminal.Current[],
mapEntries: LIST[entry],
shared: FALSE];
RETURN[ImagerDitheredDevice.ColorFromSpecialRGB[specialPixel: [index+100, null], rgb: rgb]];
RETURN[ImagerDitherContext.MakeSpecialColor[ordinaryColor: ImagerColor.ColorFromRGB[rgb], specialPixel: [index+100, null]]];
}; -- SetColor
UseDefaultColors: PUBLIC PROC[handle: GraphHandle ← NIL] = {
GetColor: PUBLIC PROC [num: ColorIndex] RETURNS [ImagerColor.RGB] = {
get color spec from user profile, or return default
ColorSpec: TYPE = LIST OF ROPE;
list: ColorSpec ← UserProfile.ListOfTokens[
key: IO.PutFR["Graph.Color%g", IO.int[num]],
default: NIL
];
c: ARRAY[1..3] OF REAL ← [
defaultColors[num].R, defaultColors[num].G, defaultColors[num].B];
i: CARDINAL ← 1;
FOR lr: ColorSpec ← list, list.rest UNTIL list = NIL OR i > 3 DO
c[i] ← Convert.RealFromRope[list.first ! Convert.Error => EXIT];
c[i] ← MAX[0, MIN[1.0, c[i]]];
i ← i + 1;
ENDLOOP;
RETURN[[R: c[1], G: c[2], B: c[3]]];
}; -- GetColor
FOR i: ColorIndex IN ColorIndex DO
c: ImagerColor.RGB ← GetColor[i];
systemColor[i] ← SetColor[i, c];
IF handle # NIL THEN IF handle.graph # NIL THEN handle.graph.color[i] ← c;
ENDLOOP;
}; -- UseDefaultColors
UseCedarColors: PUBLIC PROC[] = {
virtual: Terminal.Virtual = Terminal.Current[];
ImagerColorMap.SetStandardColorMap[virtual];
WindowManager.RestoreCursor[];
IF Terminal.GetColorCursorPresentation[virtual] # onesAreBlack THEN
[] ← Terminal.SetColorCursorPresentation[virtual, onesAreBlack];
}; -- UseCedarColors
SetCursorForBackgroundIndex: PUBLIC PROC [bkgnd: BackgroundIndex ← white] = {
bkGndColor: Imager.ConstantColor ← SELECT bkgnd FROM
gray => systemColor[GraphOps.Gray],
darkGray => systemColor[GraphOps.DarkGray],
black => systemColor[GraphOps.Black],
ENDCASE => systemColor[GraphOps.White];
cursorType: Terminal.ColorCursorPresentation ←
IF ImagerColor.GrayFromColor[bkGndColor] > 0.5 THEN onesAreWhite ELSE onesAreBlack;
cursorType: Terminal.ColorCursorPresentation ←
SELECT bkgnd FROM
black => onesAreWhite,
darkGray => onesAreWhite,
gray => onesAreBlack,
ENDCASE => onesAreBlack;
virtual: Terminal.Virtual ← Terminal.Current[];
IF cursorType # Terminal.GetColorCursorPresentation[virtual] THEN
[] ← Terminal.SetColorCursorPresentation[virtual, cursorType];
}; -- SetCursorForBackgroundIndex
UseDefaultFonts: PUBLIC PROC [handle: GraphHandle] = {
handle must not be nil !!
GetFont: PUBLIC PROC [num: FontIndex] RETURNS [gf: GraphFont] = {
get font spec from user profile, or return default
FontSpec: TYPE = LIST OF ROPE;
keyRope: ROPE ← Rope.Concat["Graph.Font", Convert.RopeFromInt[num]];
list: FontSpec ← UserProfile.ListOfTokens[key: keyRope, default: NIL];
i: CARDINAL ← 1;
gf ← defaultFonts[num];
FOR lr: FontSpec ← list, list.rest UNTIL list = NIL OR i > 3 DO
SELECT i FROM
1 => gf.family ← list.first;
2 => gf.bold ← Convert.BoolFromRope[list.first ! Convert.Error => {gf.bold ← FALSE; CONTINUE}];
3 => gf.italic ← Convert.BoolFromRope[list.first ! Convert.Error => {gf.italic ← FALSE; CONTINUE}];
4 => gf.vFontSize ← Convert.IntFromRope[list.first ! Convert.Error => {gf.vFontSize ← 8; CONTINUE}];
5 => gf.pFontScale ← Convert.RealFromRope[list.first ! Convert.Error => {gf.pFontScale ← 9.0; CONTINUE}];
ENDCASE => BlinkMsg[Rope.Cat[
"more than five values found in profile after '", keyRope, "'."]];
i ← i + 1;
ENDLOOP;
}; -- GetFont
FOR i: FontIndex IN FontIndex DO
handle.graph.font[i] ← GetFont[i];
ENDLOOP;
UseMyFonts[handle];
}; -- UseDefaultFonts
UseMyFonts: PUBLIC PROC [handle: GraphHandle] = { OPEN handle;
handle can not be nil !! for vfonts only, but display is not altered.
press fonts are initialized when user wants to print the plot or when font is updated through control-panel.
FOR i: FontIndex IN FontIndex DO OPEN handle;
imagerFonts[screen][i] ← VFonts.EstablishFont[graph.font[i].family, graph.font[i].vFontSize, graph.font[i].bold, graph.font[i].italic];
ENDLOOP;
}; -- UseMyFonts
coordinates and coordinates transformation
InViewer: PUBLIC PROC [viewer: Viewer, x, y: INTEGER] RETURNS [BOOL] ~ {
IF viewer = NIL THEN RETURN[FALSE];
RETURN[x IN[0..viewer.cw) AND y IN[0..viewer.ch)]};
CrossSegment: PUBLIC PROC[xseg, yseg: SegmentDataList, at: REAL] RETURNS [ok: BOOL ← FALSE, v1, v2: Imager.VEC ← NullVec] = {
find the segment that crosses the vertical line, x = at.
IF xseg # NIL THEN IF xseg.rest # NIL THEN {
IF GraphUtil.NotANan[xseg.first.end] THEN IF xseg.first.end >= at THEN GOTO normal;
FOR xseg ← xseg, xseg.rest UNTIL xseg = NIL DO
IF xseg.rest = NIL THEN GOTO right;
v1 ← [xseg.first.end, yseg.first.end];
IF GraphUtil.NotANan[xseg.rest.first.end] THEN
IF xseg.rest.first.end > at THEN GOTO normal;
yseg ← yseg.rest;
ENDLOOP;
EXITS
right => {
IF GraphUtil.NotANan[v1.x] AND GraphUtil.NotANan[v1.y] AND
GraphUtil.NotANan[xseg.first.end] AND GraphUtil.NotANan[yseg.first.end] THEN {
ok ← TRUE;
v2 ← [xseg.first.end, yseg.first.end]; -- Note: that v1.x may still be = v2.x.
};
};
normal => {
IF GraphUtil.NotANan[xseg.first.end] AND GraphUtil.NotANan[yseg.first.end] AND
GraphUtil.NotANan[xseg.rest.first.end] AND GraphUtil.NotANan[yseg.rest.first.end] THEN {
ok ← TRUE;
v1 ← [xseg.first.end, yseg.first.end];
v2 ← [xseg.rest.first.end, yseg.rest.first.end];
};
};
};
}; -- CrossSegment
InterOrExtraPolate: PUBLIC PROC[v1, v2: Imager.VEC, x: REAL] RETURNS [REAL] = {
Client should make sure that x1 # x2, and their components are not NtNan.
IF v1.x = v2.x THEN RaiseError[$Other, "x1 = x2 in InterOrExtraPolate"]; -- for now.
RETURN[v1.y + (v2.y - v1.y)/(v2.x - v1.x)*(x - v1.x)]
}; -- InterOrExtraPolate
Crosssection: PUBLIC PROC[xseg, yseg: SegmentDataList, at: REAL] RETURNS [ok: BOOL ← FALSE, value: REAL] = {
v1, v2: Imager.VEC;
[ok, v1, v2] ← CrossSegment[xseg, yseg, at];
IF ok THEN { -- v1 and v2 don't have NtNan as component.
IF v1.x = v2.x THEN {value ← v1.y; ok ← FALSE}
ELSE value ← InterOrExtraPolate[v1, v2, at];
};
}; -- Crosssection
RealToScreen: PUBLIC PROC [handle: GraphHandle, r: REAL, xy: XY ← x] RETURNS [s: REAL ← 0] = {
IF HandleNotNil[handle] THEN { OPEN handle;
RETURN[IF xy = x THEN axesRect.x + (r - realRect.x)*scale[x] ELSE axesRect.y + (r - realRect.y)*scale[y]]};
}; -- RealToScreen
RealToScreenI: PUBLIC PROC [handle: GraphHandle, r: REAL, xy: XY ← x] RETURNS [s: INTEGER] = {
rs: REAL ← RealToScreen[handle, r, xy];
IF rs > LAST[INTEGER] OR rs < FIRST[INTEGER] THEN {
s ← IF rs > 0 THEN LAST[INTEGER] ELSE FIRST[INTEGER];
BlinkMsg["The place is too far off the screen."];
}
ELSE s ← Real.InlineRoundI[rs];
}; -- RealToScreenI
RealVecToScreenVec: PUBLIC PROC [handle: GraphHandle, vec: Imager.VEC] RETURNS [svec: Imager.VEC ← NullVec] = {
IF HandleNotNil[handle] THEN RETURN[
[RealToScreen[handle, vec.x, x], RealToScreen[handle, vec.y, y]]];
}; -- RealVecToScreenVec
RealToScreenRel: PUBLIC PROC [handle: GraphHandle, r: REAL, xy: XY ← x] RETURNS [s: REAL ← 0.0] = { -- relative to origin of the axes.
IF HandleNotNil[handle] THEN { OPEN handle;
RETURN[IF xy = x THEN (r - realRect.x)*scale[x] ELSE (r - realRect.y)*scale[y]];
};
}; -- RealToScreenRel
ScreenToReal: PUBLIC PROC [handle: GraphHandle, s: REAL, xy: XY ← x] RETURNS [r: REAL ← 0.0] = {
IF HandleNotNil[handle] THEN { OPEN handle;
RETURN[IF xy = x THEN realRect.x + (s - axesRect.x)/scale[x] ELSE realRect.y + (s - axesRect.y)/scale[y]];
};
}; -- ScreenToReal
ScreenIToReal: PUBLIC PROC [handle: GraphHandle, s: INTEGER, xy: XY ← x] RETURNS [REAL] = {RETURN[ScreenToReal[handle, Real.Float[s], xy]]}; -- ScreenIToReal
ScreenIToRealVec: PUBLIC PROC [handle: GraphHandle, sx, sy: INTEGER] RETURNS [Imager.VEC ← NullVec] = {
RETURN[[ScreenToReal[handle, Real.Float[sx], x], ScreenToReal[handle, Real.Float[sy], y]]]}; -- ScreenIToRealVec
TextPosToChartPos: PUBLIC PROC[axesRect: Imager.Rectangle, textPos: Imager.VEC] RETURNS [x, y: INTEGER ← 0] = {
IF RectangleValid[axesRect] THEN {
x ← Real.InlineRoundI[axesRect.x + textPos.x*axesRect.w];
y ← Real.InlineRoundI[axesRect.y + textPos.y*axesRect.h];
};
}; -- TextPosToChartPos
ChartPosToTextPos: PUBLIC PROC[axesRect: Imager.Rectangle, chartPos: Imager.VEC] RETURNS [textPos: Imager.VEC ← NullVec] = {
IF RectangleValid[axesRect] THEN {
textPos.x ← (chartPos.x - axesRect.x)/axesRect.w;
textPos.y ← (chartPos.y - axesRect.y)/axesRect.h;
};
}; -- ChartPosToTextPos
TextRect: PUBLIC PROC[text: Text ← NIL, font: ImagerFont.Font ← NIL, axesRect: Imager.Rectangle ← NullRect] RETURNS [rect: Imager.Rectangle ← NullRect, hotPoint: Imager.VEC ← NullVec] = {
returns the rectangle and hotpoint of text on graph viewer.
IF text # NIL AND font # NIL THEN {
extents: ImagerFont.Extents ← ImagerFont.RopeBoundingBox[font, text.text];
rect.w ← extents.rightExtent - extents.leftExtent;
rect.h ← extents.descent + extents.ascent;
[hotPoint.x, hotPoint.y] ← TextPosToChartPos[axesRect, text.place];
rect.x ← hotPoint.x - extents.leftExtent - (SELECT text.justifX FROM
right => rect.w, center => rect.w*0.5, ENDCASE => 0.0);
rect.y ← hotPoint.y + extents.descent - (SELECT text.justifY FROM
top => rect.h, center => rect.h*0.5, ENDCASE => 0.0);
};
}; -- TextRect
panel fields
SetToggleColor: PUBLIC PROC[switch: Buttons.Button ← NIL, on: BOOL ← TRUE, paint: BOOL ← TRUE] RETURNS [BOOL] = {
IF ViewerNotNil[switch] THEN
Buttons.SetDisplayStyle[switch, IF on THEN $WhiteOnBlack ELSE $BlackOnWhite, paint];
RETURN[on];
}; -- SetToggleColor
SetIntField: PUBLIC PROC[field: Viewer ← NIL, value: INT ← 0] = {
IF ViewerNotNil[field] THEN
ViewerTools.SetContents[field, Convert.RopeFromInt[value]];
}; -- SetIntField
GetIntField: PUBLIC PROC[field: Viewer ← NIL, showMsg: BOOL ← TRUE] RETURNS [msg: ROPE ← NIL, int: INT ← 0] = {
IF ViewerNotNil[field] THEN
int ← Convert.IntFromRope[ViewerTools.GetContents[field] !
Convert.Error => {
msg ← SELECT reason FROM
empty => "field empty",
syntax => Rope.Cat["syntax error at location [", Convert.RopeFromInt[index], "]"],
overflow => "input string cannot be expressed as an INT",
ENDCASE => "error in convertion";
IF showMsg THEN BlinkMsg[msg.Cat[" in the ",
NARROW[ViewerOps.FetchProp[field, $Label]], " field."]];
int ← 0;
CONTINUE;
}
];
}; -- GetIntField
SetRealField: PUBLIC PROC[field: Viewer ← NIL, value: REAL ← 0.0] = {
IF ViewerNotNil[field] THEN
ViewerTools.SetContents[field, Convert.RopeFromReal[value]];
}; -- SetRealField
GetRealField: PUBLIC PROC[field: Viewer ← NIL, showMsg: BOOL ← TRUE] RETURNS [msg: ROPE ← NIL, real: REAL ← 0.0] = {
IF ViewerNotNil[field] THEN {
real ← Convert.RealFromRope[ViewerTools.GetContents[field] !
Convert.Error => {
msg ← SELECT reason FROM
empty => "field empty",
syntax => Rope.Cat["syntax error at location [", Convert.RopeFromInt[index], "]"],
ENDCASE => "convertion error";
IF showMsg THEN BlinkMsg[msg.Cat["in the ",
NARROW[ViewerOps.FetchProp[field, $Label]], " field."]];
real ← 0.0;
CONTINUE;
}
];
};
}; -- GetRealField
text and entity
FontHeight: PUBLIC PROC [font: ImagerFont.Font ← NIL] RETURNS [height: REAL ← 0] = {
IF font # NIL THEN {
extents: ImagerFont.Extents ← ImagerFont.FontBoundingBox[font];
height ← extents.descent+extents.ascent;
};
}; -- FontHeight
RopeSize: PUBLIC PROC [rope: ROPE ← NIL, font: ImagerFont.Font] RETURNS [width, height: REAL ← 0] = {
IF NOT rope.IsEmpty[] THEN {
extents: ImagerFont.Extents ← ImagerFont.RopeBoundingBox[font: font, rope: rope];
width ← extents.rightExtent - extents.leftExtent;
height ← extents.descent + extents.ascent;
};
}; -- RopeSize
FullName: PUBLIC PROC [entity: Entity ← NIL] RETURNS [fullName: ROPE ← NIL] = {
Returns the full name of the entity.
IF entity # NIL THEN {
fullName ← entity.name;
FOR gen: NestedEntities ← entity.parent, gen.parent UNTIL gen = NIL DO
fullName ← IF gen.parent = NIL AND gen.name = NIL THEN fullName
ELSE IF gen.name = NIL THEN Rope.Concat["/", fullName]
ELSE gen.name.Cat["/", fullName];
ENDLOOP;
};
}; -- FullName
TextFromId: PUBLIC PROC[texts: Texts ← NIL, id: INT ← 0] RETURNS [text: Text ← NIL] = {
FOR ts: Texts ← texts, ts.rest UNTIL ts = NIL DO
IF ts.first.id = id THEN text ← ts.first;
ENDLOOP;
}; -- TextFromId
EntityFromId: PUBLIC PROC[entityList: EntityList, id: INT] RETURNS [entity: Entity ← NIL] = { -- ref may be EntityList or EntityHash.
FOR el: EntityList ← entityList, el.rest UNTIL el = NIL DO
IF el.first.id = id THEN entity ← el.first;
ENDLOOP;
}; -- EntityFromId
SpecIndexedText: PUBLIC PROC [controller: Controller ← NIL, texts: Texts ← NIL] RETURNS [text: Text ← NIL] = {
get it from the id specified on spec.
IF ControllerNotNil[controller] THEN {
msg: ROPE; i: INT;
[msg, i] ← GetIntField[controller.textId];
IF msg = NIL THEN {
text ← TextFromId[texts, i];
IF text = NIL THEN BlinkMsg[Rope.Concat[
"There is no text with id = ", Convert.RopeFromInt[i]]];
};
};
}; -- SpecIndexedText
SpecIndexedEntity: PUBLIC PROC [controller: Controller ← NIL, ref: REF ANY ← NIL] RETURNS [entity: Entity ← NIL] = { -- ref may be an entityList or an entityHash.
IF ControllerNotNil[controller] THEN {
msg: ROPE; i: INT;
[msg, i] ← GetIntField[controller.entityId];
IF msg = NIL THEN {
entityList: EntityList;
entityList ← WITH ref SELECT FROM
h: EntityHash => h[i MOD EntityHashSize],
e: EntityList => e,
ENDCASE => NIL;
entity ← EntityFromId[entityList, i];
IF entity = NIL THEN BlinkMsg[Rope.Concat[
"There is no curve with id = ", Convert.RopeFromInt[i]]];
};
};
}; -- SpecIndexedEntity
ReverseTexts: PUBLIC PROC [old: Texts, killOld: BOOL ← TRUE] RETURNS [new: Texts] = { -- killOld only "partially" kills the old list.
new ← NIL;
FOR ts: Texts ← old, ts.rest UNTIL ts = NIL DO
new ← CONS[ts.first, new];
ENDLOOP;
IF killOld THEN old ← GraphCleanUp.CleanUpTexts[old, FALSE];
}; -- ReverseTexts
ReverseEntityList: PUBLIC PROC [old: EntityList, killOld: BOOL ← TRUE] RETURNS [new: EntityList] = { -- killOld only "partially" kills the old list.
new ← NIL;
FOR el: EntityList ← old, el.rest UNTIL el = NIL DO
new ← CONS[el.first, new];
ENDLOOP;
IF killOld THEN old ← GraphCleanUp.CleanUpEL[old, FALSE];
}; -- ReverseEntityList
ReverseValueList: PUBLIC PROC [old: ValueList ← NIL, killOld: BOOL ← TRUE] RETURNS [new, last: ValueList ← NIL] = {
FOR vl: ValueList ← old, vl.rest UNTIL vl = NIL DO
new ← CONS[vl.first, new];
IF vl = old THEN last ← new;
ENDLOOP;
IF killOld THEN old ← GraphCleanUp.CleanUpVL[old];
}; -- ReverseValueList
CopyValueList: PUBLIC PROC [old: ValueList ← NIL, killOld: BOOL ← TRUE] RETURNS [new, last: ValueList] = {
[new, ] ← ReverseValueList[old, killOld];
[new, last] ← ReverseValueList[new, TRUE];
}; -- CopyValueList
ReverseSDL: PUBLIC PROC [old: SegmentDataList ← NIL, killOld: BOOL ← TRUE] RETURNS [new, last: SegmentDataList ← NIL] = {
FOR sdl: SegmentDataList ← old, sdl.rest UNTIL sdl = NIL DO
new ← CONS[sdl.first, new];
IF sdl = old THEN last ← new;
ENDLOOP;
IF killOld THEN old ← GraphCleanUp.CleanUpSDL[old];
}; -- ReverseSDL
InitSegEnd: PUBLIC PROC [entity: Entity ← NIL] = {
sdl: SegmentDataList ← NIL;
entity.segments ← NIL;
FOR vl: ValueList ← entity.oldValues, vl.rest UNTIL vl = NIL DO
sdl ← CONS[NEW[SegmentDataRec ← [end: vl.first]], sdl];
ENDLOOP;
[entity.segments, entity.lastSegment] ← ReverseSDL[sdl];
}; -- InitSegEnd
SetSegment: PROC [seg: SegmentData, x1, x2, y2: REAL] = {
IF seg # NIL THEN {
ENABLE Real.RealException => {seg^ ← [ok: FALSE, end: seg.end]; CONTINUE};
a, b, factor: REAL;
IF GraphUtil.NotANan[x1] AND GraphUtil.NotANan[x2] AND GraphUtil.NotANan[seg.end] AND GraphUtil.NotANan[y2] THEN {
a ← y2 - seg.end;
b ← x1 - x2;
IF (factor ← RealFns.SqRt[a*a+b*b]) > 0.0 THEN {
factor ← 1.0/factor;
seg^ ← [ok: TRUE, end: seg.end,
nx: a*factor, ny: b*factor, d0: (x1*y2 - x2*seg.end)*factor];
};
};
};
}; -- SetSegment
SetSegments: PUBLIC PROC [entity: Entity] = {
assume entity.segments.end's and entity.group.x.segments have been set.
xseg: SegmentDataList ← entity.group.x.segments;
FOR yseg: SegmentDataList ← entity.segments, yseg.rest UNTIL yseg.rest = NIL DO
SetSegment[yseg.first, xseg.first.end, xseg.rest.first.end, yseg.rest.first.end];
xseg ← xseg.rest;
ENDLOOP;
}; -- SetSegments
InitSegAll: PUBLIC PROC [entity: Entity ← NIL] = {
InitSegEnd[entity];
SetSegments[entity];
}; -- InitSegAll
UpdateSegEnd: PUBLIC PROC [entity: Entity, values: ValueList] = {
should check that values and entity.segments have the same length before calling this proc.
oldSDL: SegmentDataList ← entity.segments;
vl: ValueList ← values;
entity.segments ← NIL;
IF values # NIL THEN
FOR sdl: SegmentDataList ← oldSDL, sdl.rest UNTIL sdl = NIL DO
sdl.first.end ← vl.first;
vl ← vl.rest;
ENDLOOP;
entity.segments ← oldSDL;
}; -- UpdateSegEnd
UpdateSegAll: PUBLIC PROC [entity: Entity, values: ValueList] = {
IF values # NIL THEN {
UpdateSegEnd[entity, values];
SetSegments[entity];
};
}; -- UpdateSegAll
LengthOfVL: PUBLIC PROC [valueList: ValueList ← NIL] RETURNS [INT] = {
length: INT ← 0;
FOR vl: ValueList ← valueList, vl.rest UNTIL vl = NIL DO
length ← length + 1;
ENDLOOP;
RETURN[length];
}; -- LengthOfVL
LengthOfEL: PUBLIC PROC [entityList: EntityList ← NIL, group: EntityGroup ← NIL] RETURNS [INT] = {
length: INT ← 0;
FOR el: EntityList ← entityList, el.rest UNTIL el = NIL DO
IF group = NIL THEN length ← length + 1
ELSE IF el.first.group.id = group.id THEN length ← length + 1;
ENDLOOP;
RETURN[length];
}; -- LengthOfEL
LengthOfSDL: PUBLIC PROC [segmentDataList: SegmentDataList ← NIL] RETURNS [INT] = {
length: INT ← 0;
FOR sdl: SegmentDataList ← segmentDataList, sdl.rest UNTIL sdl = NIL DO
length ← length + 1;
ENDLOOP;
RETURN[length];
}; -- LengthOfSDL
AppendX: PUBLIC PROC [xEntity: Entity, newx: REAL] RETURNS [oldx: REAL ← 0.0] = {
Note that segments will always be appended. cf. AppendY.
vl: Graph.ValueList ← CONS[newx, NIL];
sdl: Graph.SegmentDataList ← CONS[NEW[Graph.SegmentDataRec ← [end: newx]], NIL];
IF xEntity.lastValue = NIL THEN {
xEntity.oldValues ← xEntity.lastValue ← vl;
xEntity.segments ← xEntity.lastSegment ← sdl;
}
ELSE {
xEntity.lastValue.rest ← vl;
xEntity.lastValue ← vl;
oldx ← xEntity.lastSegment.first.end;
xEntity.lastSegment.rest ← sdl;
xEntity.lastSegment ← sdl;
};
}; -- AppendX
AppendY: PUBLIC PROC [entity: Entity, y, x1, x2: REAL ← 0.0] RETURNS [oldy: REAL ← 0.0] = {
Note that segments will be appended for first value (iff lastValue = nil).
But if lastValue # nil, segments won't be appended if segments is nil. (When user has removed it from plot.)
vl: Graph.ValueList ← CONS[y, NIL];
sdl: Graph.SegmentDataList ← CONS[NEW[Graph.SegmentDataRec ← [end: y]], NIL];
IF entity.lastValue = NIL THEN {
entity.oldValues ← entity.lastValue ← vl;
entity.segments ← entity.lastSegment ← sdl;
}
ELSE {
entity.lastValue.rest ← vl;
entity.lastValue ← vl;
IF entity.segments # NIL THEN {
oldy ← entity.lastSegment.first.end;
SetSegment[entity.lastSegment.first, x1, x2, y];
entity.lastSegment.rest ← sdl;
entity.lastSegment ← sdl;
};
};
}; -- AppendY
AppendX: PUBLIC PROC [entity: Entity, newx: REAL] RETURNS [first: BOOL ← FALSE, oldx: REAL] = { -- so far called by GraphOps.AddCrossSection only.
Append new value on x entity.
IF entity.lastValue # NIL THEN {
entity.lastValue.rest ← CONS[newx, NIL];
entity.lastValue ← entity.lastValue.rest;
}
ELSE {
IF entity.oldValues = NIL THEN {
first ← TRUE;
entity.lastValue ← entity.oldValues ← CONS[newx, NIL];
}
ELSE {
entity.lastValue ← entity.oldValues;
UNTIL entity.lastValue.rest = NIL DO
entity.lastValue ← entity.lastValue.rest;
ENDLOOP;
entity.lastValue.rest ← CONS[newx, NIL];
entity.lastValue ← entity.lastValue.rest;
};
};
IF entity.lastSegment = NIL AND entity.segments = NIL THEN {
InitSegEnd[entity];
entity.lastSegment ← entity.segments;
UNTIL entity.lastSegment.rest = NIL DO
IF entity.lastSegment.rest.rest = NIL THEN oldx ← entity.lastSegment.first.end;
entity.lastSegment ← entity.lastSegment.rest;
ENDLOOP;
}
ELSE {
IF entity.lastSegment = NIL THEN {
entity.lastSegment ← entity.segments;
UNTIL entity.lastSegment.rest = NIL DO
entity.lastSegment ← entity.lastSegment.rest;
ENDLOOP;
};
oldx ← entity.lastSegment.first.end;
entity.lastSegment.rest ← CONS[NEW[SegmentDataRec ← [end: newx]], NIL];
entity.lastSegment ← entity.lastSegment.rest;
};
}; -- AppendX
AppendY: PUBLIC PROC [entity: Entity, x1, x2, y: REAL] RETURNS [first: BOOL ← FALSE, oldy: REAL] = { -- so far called by GraphOps.AddCrossSection only.
AppendX must have been called.
IF entity.lastValue # NIL THEN {
oldy ← entity.lastValue.first;
entity.lastValue.rest ← CONS[y, NIL];
entity.lastValue ← entity.lastValue.rest;
}
ELSE {
IF entity.oldValues = NIL THEN {
entity.lastValue ← entity.oldValues ← CONS[y, NIL];
first ← TRUE;
}
ELSE {
entity.lastValue ← entity.oldValues;
UNTIL entity.lastValue.rest = NIL DO
entity.lastValue ← entity.lastValue.rest;
ENDLOOP;
oldy ← entity.lastValue.first;
entity.lastValue.rest ← CONS[y, NIL];
entity.lastValue ← entity.lastValue.rest;
};
};
IF entity.lastSegment = NIL AND entity.segments = NIL THEN {
InitSegAll[entity];
entity.lastSegment ← entity.segments;
UNTIL entity.lastSegment.rest = NIL DO
entity.lastSegment ← entity.lastSegment.rest;
ENDLOOP;
}
ELSE {
either lastSegment # nil or segments # nil. but if segments = nil then lastSegment must be nil. so segments # nil for sure. So we only have to make sure lastSegment # nil here.
IF entity.lastSegment = NIL THEN {
entity.lastSegment ← entity.segments;
UNTIL entity.lastSegment.rest = NIL DO
entity.lastSegment ← entity.lastSegment.rest;
ENDLOOP;
};
If y is the first value on entity, then it must have been taken care of above. (segments = lastsegment = nil.)
IF first THEN RaiseError[$Other,
"unexpected condition in GraphOpsImpl.AppendValueAndSegment."]
ELSE {
a: REAL ← y - oldy;
b: REAL ← x1 - x2;
factor: REAL ← 1.0/RealFns.SqRt[a*a+b*b];
entity.lastSegment.first^ ← [end: oldy, nx: a*factor, ny: b*factor, d0: (x1*y - x2*oldy)*factor];
entity.lastSegment.rest ← CONS[NEW[SegmentDataRec ← [end: y]], NIL];
entity.lastSegment ← entity.lastSegment.rest;
};
};
}; -- AppendY
AppendTexts: PUBLIC PROC [first, second: Texts ← NIL] RETURNS [new: Texts] = {
order: old texts followed by new texts.
IF first = NIL THEN new ← second
ELSE {
FOR txs: Texts ← first, txs.rest UNTIL txs = NIL DO
IF txs.rest = NIL THEN {txs.rest ← second; EXIT};
ENDLOOP;
new ← first;
};
}; -- AppendTexts
AppendEntityList: PUBLIC PROC [first, second: EntityList ← NIL] RETURNS [new: EntityList] = {
order: old texts followed by new texts.
IF first = NIL THEN new ← second
ELSE {
FOR txs: EntityList ← first, txs.rest UNTIL txs = NIL DO
IF txs.rest = NIL THEN {txs.rest ← second; EXIT};
ENDLOOP;
new ← first;
};
}; -- AppendEntityList
AppendEGL: PUBLIC PROC [first, second: EntityGroupList ← NIL] RETURNS [new: EntityGroupList] = {
order: old texts followed by new texts.
IF first = NIL THEN new ← second
ELSE {
FOR txs: EntityGroupList ← first, txs.rest UNTIL txs = NIL DO
IF txs.rest = NIL THEN {txs.rest ← second; EXIT};
ENDLOOP;
new ← first;
};
}; -- AppendEntityList
NewTextId: PUBLIC PROC [handle: GraphHandle, tryId: INT] RETURNS [newId: INT ← -1] = {
IF HandleNotNil[handle] THEN { OPEN handle;
IF tryId <= lastTextId THEN {
IF TextFromId[allTexts, tryId] = NIL THEN RETURN[tryId]
ELSE BlinkMsg[IO.PutFR["Warning: Text id %g already used.", IO.int[tryId]]];
};
RETURN[lastTextId ← lastTextId + 1];
};
}; -- NewTextId
NewEntityId: PUBLIC PROC [handle: GraphHandle, tryId: INT] RETURNS [newId: INT ← -1] = {
IF HandleNotNil[handle] THEN { OPEN handle;
IF tryId < 0 THEN tryId ← 0;
IF tryId <= lastEntityId THEN {
IF EntityFromId[entityHash[tryId MOD EntityHashSize], tryId] = NIL THEN RETURN[tryId]
ELSE BlinkMsg[IO.PutFR["Warning: Entity id %g already used.", IO.int[tryId]]];
};
RETURN[lastEntityId ← lastEntityId + 1];
};
}; -- NewEntityId
NewGroupId: PUBLIC PROC [handle: GraphHandle, tryId: INT] RETURNS [newId: INT ← -1] = {
IF HandleNotNil[handle] THEN { OPEN handle;
lastId: INT ← -1;
used: BOOL ← FALSE;
FOR egl: EntityGroupList ← entityGroupList, egl.rest UNTIL egl = NIL DO
IF tryId = egl.first.id THEN used ← FALSE;
lastId ← MAX[lastId, egl.first.id];
ENDLOOP;
IF used THEN BlinkMsg[IO.PutFR["Warning: Group id %g already used.", IO.int[tryId]]];
RETURN[IF used THEN lastId + 1 ELSE tryId];
};
}; -- NewGroupId
graphs and entity groups
CopyEntityGroupList: PUBLIC PROC[entityGroupList: EntityGroupList ← NIL, max: INT ← 0]
RETURNS [new: EntityGroupList ← NIL, incomplete: BOOL ← FALSE] = {
copy at most max elements on a to b and preserve the order.
if there are more than max elements on a then set incomplete to TRUE.
n: INT ← 0;
FOR eg: EntityGroup ← entityGroupList.first, eg.rest UNTIL eg = NIL OR n >= max DO
eg: EntityGroup; m: INT;
[eg, m, incomplete] ← CopyEntityGroup[eg, max - n];
new ← CONS[t, new];
n ← n + m;
ENDLOOP;
}; -- CopyEntityGroupList
CopyEntityGroup: PUBLIC PROC[entityGroup: EntityGroup ← NIL, max: INT ← 0] RETURNS [
new: EntityGroup ← NIL, m: INT ← 0, incomplete: BOOL ← FALSE] = {
n: INT ← 0;
FOR ne: NestedEntities ← entityGroup.y, ne.child UNTIL ne = NIL OR n >= max DO
el: EntityList; m: INT;
[el, m, incomplete] ← CopyEntities[ne, max - n];
new ← CONS[t, new];
n ← n + m;
ENDLOOP;
}; -- CopyEntityGroup
MergeGraph: PUBLIC PROC[handle: GraphHandle ← NIL, graph: GRAPH ← NIL, paint: BOOL ← TRUE] = {
}; -- MergeGraph
ReplaceGraph: PUBLIC PROC[handle: GraphHandle ← NIL, graph: GRAPH ← NIL, paint: BOOL ← TRUE] = {
}; -- ReplaceGraph
VanilaGraph: PUBLIC PROC[] RETURNS [graph: GRAPH] = {
graph ← NEW[GraphRec ← []];
FOR i: CaretIndex IN CaretIndex DO
graph.caret[i] ← NEW[CaretSpecRec ← []];
ENDLOOP;
FOR xy: XY IN XY DO
graph.target[xy] ← NEW[TargetSpecRec ← []];
ENDLOOP;
}; -- VanilaGraph
strings
FileFromSelection: PUBLIC PROC[wDir: ROPE ← NIL] RETURNS [file, msg: ROPE ← NIL] = {
file ← ViewerTools.GetSelectionContents[];
IF file.IsEmpty[] THEN msg ← "Please select a file name."
ELSE [file, ] ← FS.ExpandName[file, wDir!
FS.Error => {msg ← error.explanation; CONTINUE}];
}; -- FileFromSelection
ReplaceFileExt: PUBLIC PROC[file: ROPE, extension: ROPE ← NIL] RETURNS [new: ROPE ← NIL] = {
cp: FS.ComponentPositions;
fullName, msg: ROPE;
ok: BOOL ← TRUE;
IF file.IsEmpty[] THEN {msg ← "File name is empty. "; file ← "Graph"};
IF extension.IsEmpty[] THEN {
msg ← msg.Concat["Extension is empty. "]; extension ← "graph"};
IF msg = NIL THEN [fullName, cp, ] ← FS.ExpandName[file !
FS.Error => {msg ← error.explanation; CONTINUE}];
IF msg = NIL THEN new ← Rope.Cat[fullName.Substr[0, cp.base.start + cp.base.length], ".", extension]
ELSE {
new ← file.Cat[".", extension];
BlinkMsg[msg.Cat[new, " ok?"]];
};
}; -- ReplaceFileExt
WDirOfViewer: PUBLIC PROC [viewer: Viewer] RETURNS [wDir: ROPE] = {
viewer is assumed to be a graph viewer, but it may also work for some other viewers.
wDir ← "[]<>";
IF viewer # NIL THEN {
cp: FS.ComponentPositions;
viewerName: ROPE ← NIL;
[viewerName, cp, ] ← FS.ExpandName[viewer.name
! FS.Error => {viewerName ← NIL}];
IF NOT viewerName.IsEmpty[] THEN wDir ← viewerName.Substr[0, cp.base.start];
};
}; -- WDirOfChartViewer
waitProgramMsg: PUBLIC ROPE = "Graph is currently controlled by a program. Please wait till it finishes to do this.";
viewer, handle, properties
HandleFromViewer: PUBLIC PROC[viewer: Viewer ← NIL] RETURNS [GraphHandle] = {
RETURN[
IF IsGraphViewer[viewer] THEN NARROW[viewer.data]
ELSE IF IsController[viewer] THEN NARROW[
ViewerOps.FetchProp[viewer, $GraphController]]
ELSE NIL
];
}; -- HandleFromViewer
VanillaHandle: PUBLIC PROC [] RETURNS [handle: GraphHandle ← NIL] = {
handle ← NEW[GraphHandleRec ← []];
{ OPEN handle;
chart ← VanillaChart[];
graph ← VanillaGraph[];
entityHash ← NEW[EntityHashArray ← ALL[NIL]];
imagerFonts ← [NEW[FontArray ← ALL[NIL]], NEW[FontArray ← ALL[NIL]]];
paintInfo ← NEW[PaintInfoRec ← []];
TRUSTED {Process.SetTimeout[@unlocked, Process.MsecToTicks[500]]};
};
}; -- VanillaHandle
VanillaChart: PROC [] RETURNS [chart: Chart ← NIL] = {
chart ← NEW[ChartRec ← []];
FOR i: CaretIndex IN CaretIndex DO
chart.caretState[i] ← NEW[CaretStateRec ← []]; ENDLOOP;
}; -- VanillaChart
VanillaGraph: PROC [] RETURNS [graph: GRAPH ← NIL] = {
graph ← NEW[GraphRec ← []];
FOR i: CaretIndex IN CaretIndex DO
graph.caret[i] ← NEW[CaretSpecRec ← []]; ENDLOOP;
FOR i: XY IN XY DO
graph.target[i] ← NEW[TargetSpecRec ← []]; ENDLOOP;
graph.color ← NEW[GraphColorsArray ← defaultColors^];
graph.font ← NEW[GraphFontsArray ← defaultFonts^];
}; -- VanillaGraph
AddProp: PUBLIC PROC [object: REF ANY, prop: ATOM, val: REF ANY] = {
WITH object SELECT FROM
c: Entity => ATOM.PutPropOnList[c.props, prop, val];
cs: EntityList => ATOM.PutPropOnList[cs.props, prop, val];
t: Text => ATOM.PutPropOnList[t.props, prop, val];
ENDCASE => RaiseError[$UnknowObject, "in AddProp"];
}; -- AddProp
FetchProp: PUBLIC PROC [object: REF ANY, prop: ATOM] RETURNS [val: REF ANY] = {
WITH object SELECT FROM
c: Entity => val ← ATOM.GetPropFromList[c.props, prop];
cs: EntityList => val ← ATOM.GetPropFromList[cs.props, prop];
t: Text => val ← ATOM.GetPropFromList[t.props, prop];
ENDCASE => RaiseError[$UnknowObject, "in FetchProp"];
}; -- FetchProp
misc
Almost: PUBLIC PROC [p, q: REAL] RETURNS [a: BOOL ← TRUE] = {
IF GraphUtil.NotANumber[p] THEN RETURN[GraphUtil.NotANumber[q]]
ELSE IF GraphUtil.NotANumber[q] THEN RETURN[FALSE]
ELSE {
max: REAL ← MAX[ABS[p], ABS[q]];
IF max # 0.0 THEN a ← (ABS[p - q]/max) < 0.00001;
};
}; -- Almost
DataBounds: PUBLIC PROC[entityList: EntityList, old: Imager.Box] RETURNS [Imager.Box] = {
ValidateMax: PROC [min, max: REAL] RETURNS [REAL] = {
RETURN[IF min = 0.0 AND max = 0.0 THEN 1.0
ELSE IF min >= max THEN min + (ABS[min] + ABS[max])/2.0
ELSE max];
};
xmin, ymin, xmax, ymax: REAL;
IF entityList = NIL THEN {
IF BoundsValid[old] THEN RETURN[old]
ELSE [xmin, ymin, xmax, ymax] ← old;
}
ELSE { -- entityList # nil
prevX: Entity ← NIL;
xmin ← ymin ← Real.LargestNumber;
xmax ← ymax ← -xmin;
FOR el: EntityList ← entityList, el.rest UNTIL el = NIL DO
currX: Entity ← el.first.group.x;
x bounds
IF currX # prevX THEN {
FOR sdl: SegmentDataList ← currX.segments, sdl.rest UNTIL sdl = NIL DO
rx: REAL ← sdl.first.end;
IF GraphUtil.NotANan[rx] THEN {xmin ← MIN[rx, xmin]; xmax ← MAX[rx, xmax]};
ENDLOOP;
prevX ← currX;
};
y bounds
FOR sdl: SegmentDataList ← el.first.segments, sdl.rest UNTIL sdl = NIL DO
ry: REAL ← sdl.first.end;
IF GraphUtil.NotANan[ry] THEN {ymin ← MIN[ry, ymin]; ymax ← MAX[ry, ymax]};
ENDLOOP;
ENDLOOP;
};
RETURN[[xmin, ymin, ValidateMax[xmin, xmax], ValidateMax[ymin, ymax]]];
}; -- DataBounds
}.
LOG.
SChen, October 9, 1985 8:59:32 pm PDT, created.