DIRECTORY
Convert USING [RopeFromReal],
Graph USING [BackgroundIndex, BWLineState, CaretIndex, CaretSpec, ColorMode, Entity, EntityColor, EntityList, FontIndex, Fonts, GraphHandle, JustifX, JustifY, LastEntityColor, LineStateRec, Mark, MaxStep, NullVec, OutputType, PaintInfo, ROPE, SegmentData, SegmentDataList, StepCount, Text, Texts, UnitLineWidth, ValueList, XY],
GraphCarets USING [Resume, Suspend],
GraphConvert USING [CharRopeFromMark, RopeOfPlace, RopeOfSlope],
GraphPrivate USING [systemColor],
GraphUtil USING [Almost, BackgroundColor, BlinkMsg, DataBounds, FontHeight, ForegroundColor, FullName, NotANan, NotANumber, RealToScreen, RealToScreenI, RealVecToScreenVec, RopeSize],
Imager USING [Box, ClipRectangle, Color, Context, DoSaveAll, MaskRectangle, MaskStroke, MaskVector, PathProc, Rectangle, RotateT, SetColor, SetFont, SetStrokeEnd, SetStrokeJoint, SetStrokeWidth, SetXY, ShowRope, TranslateT, VEC],
ImagerBackdoor USING [GetBounds],
ImagerFont USING [Extents, Font, RopeBoundingBox],
Real USING [FixI, RoundI, RoundLI],
RealFns USING [Log, Power, SqRt], 
Rope USING [Cat, Concat, IsEmpty];

GraphDraw: CEDAR PROGRAM
IMPORTS Convert, Imager, ImagerBackdoor, ImagerFont, GraphCarets, GraphConvert, GraphPrivate, GraphUtil, Real, RealFns, Rope
EXPORTS GraphPrivate = {

OPEN Graph, GraphPrivate, GraphUtil;

TextHeightFudge: REAL = 8.0;
TextWidthFudge: REAL = 8.0;
shortLegendW: REAL = 200;

bwLineState: BWLineState _ NEW[LineStateRec _ []];

DrawProc: TYPE = PROC [context: Imager.Context _ NIL, handle: GraphHandle _ NIL];

Draw: PUBLIC PROC [context: Imager.Context _ NIL, handle: GraphHandle _ NIL] = {
IF context # NIL AND handle # NIL THEN IF handle.paintInfo # NIL THEN { OPEN handle;
autoRepaint: BOOL _ paintInfo.item = all AND (NOT paintInfo.clear) AND chart.dirty; 
GraphCarets.Suspend[];
SELECT handle.paintInfo.item FROM
all => DrawGraph[context, handle];
allCurves => DrawMajorPart[context, handle];
graphEntity => DrawEntity[context, handle];
graphText => DrawText[context, handle];
tails => DrawTails[context, handle];
rectangle => DrawGraph[context, handle];
target => DrawTargets[context, handle];
grid => DrawTicks[context, handle, handle.paintInfo.xy, FALSE]; -- false: no label.
legend => DrawLegend[context, handle];
ENDCASE;
GraphCarets.Resume[];
};
}; -- Draw

DrawGraph: DrawProc = { OPEN handle;
info: PaintInfo _ paintInfo;
rect: Imager.Rectangle _ IF info.output = interpress THEN [0.0, -518.16, 670.56, 518.16]
ELSE ImagerBackdoor.GetBounds[context];

axesRectSave: Imager.Rectangle;
scaleSave: ARRAY XY OF REAL;
dlSave: BOOL;
IF info.output = interpress THEN {axesRectSave _ axesRect; scaleSave _ scale; dlSave _ normalLegend;}
ELSE IF info.clear THEN { -- happens in screen painting only.
clearProc: PROC = {
context.SetColor[BackgroundColor[backgroundIndex, screen]]; 
context.MaskRectangle[rect];
};
context.DoSaveAll[clearProc];
FOR i: CaretIndex IN CaretIndex DO
chart.caretState[i].visible _ FALSE;
ENDLOOP;
};

normalLegend _ (info.output = interpress) OR rect.h >= 450;
{ -- setting axesRect
margin1: REAL = MIN[rect.h * 0.05, 10.0];
margin2: REAL = MIN[rect.w * 0.05, 20.0];
xLabelH: REAL = FontHeight[imagerFonts[paintInfo.output][0]];
legendH: REAL = FontHeight[imagerFonts[paintInfo.output][1]]; -- for legend, footnote
topTextsH: REAL = MIN[rect.h * 0.17, 50.0]; -- don't calculate anything else to save time.
leftTextsW: REAL = MIN[rect.h * 0.25, 70.0];
rightTextsW: REAL = MIN[rect.w * 0.35, IF normalLegend THEN leftTextsW ELSE shortLegendW];
bottomTextsH: REAL _ MIN[rect.h*0.35, xLabelH + TextHeightFudge + (IF normalLegend THEN legendH*7.0 + TextHeightFudge + TextHeightFudge ELSE 0.0)];
axesRect _ [
x: rect.x + margin1 + leftTextsW,
y: rect.y + margin1 + bottomTextsH,
w: rect.w - margin2 - leftTextsW - rightTextsW,
h: rect.h - margin2 - topTextsH - bottomTextsH
];
}; -- setting axesRect

IF axesRect.w > 0.0 AND axesRect.h > 0.0 THEN {
wholePicture: PROC = {
ScaleAxes[handle];
DrawAxes[context, handle];
DrawTicks[context, handle, x, TRUE];
DrawTicks[context, handle, y, TRUE];
DrawTexts[context, handle];
IF graph.entityList # NIL THEN {
info.entity _ graph.entityList.first;
info.onlyOne _ FALSE;
DrawLegend[context, handle];
};
IF info.output = interpress THEN PrintCaretsInfo[context, handle];
IF graph.target[x].on THEN {info.xy _ x; DrawTargets[context, handle]};
IF graph.target[y].on THEN {info.xy _ y; DrawTargets[context, handle]};
DrawEntities[context, handle];
};
context.DoSaveAll[wholePicture];
};

IF info.output = interpress THEN {axesRect _ axesRectSave; scale _ scaleSave; normalLegend _ dlSave};

FOR i: CaretIndex IN CaretIndex DO
chart.caretState[i].x _ RealToScreenI[handle, graph.caret[i].place.x, x];
chart.caretState[i].y _ RealToScreenI[handle, graph.caret[i].place.y, y];
ENDLOOP;
}; -- DrawGraph

DrawMajorPart: DrawProc = { OPEN handle;
IF axesRect.w > 0.0 AND axesRect.h > 0.0 THEN {
majorPart: PROC = {
IF paintInfo.clear THEN {
clearProc: PROC = {
context.SetColor[BackgroundColor[backgroundIndex, screen]]; 
context.MaskRectangle[axesRect];
};
context.DoSaveAll[clearProc];
FOR i: CaretIndex IN CaretIndex DO
chart.caretState[i].visible _ FALSE;
ENDLOOP;
};
context.ClipRectangle[axesRect];
DrawAxes[context, handle];
DrawTicks[context, handle, x, TRUE];
DrawTicks[context, handle, y, TRUE];
DrawTexts[context, handle];
IF graph.target[x].on THEN {paintInfo.xy _ x; DrawTargets[context, handle]};
IF graph.target[y].on THEN {paintInfo.xy _ y; DrawTargets[context, handle]};
DrawEntities[context, handle];
};
context.DoSaveAll[majorPart];
};
}; -- DrawMajorPart

DrawTargets: DrawProc = { OPEN handle;
targetProc: PROC = {
info: PaintInfo _ handle.paintInfo;
rect: Imager.Rectangle;
tcolor: Imager.Color _ IF info.action = erase THEN BackgroundColor[backgroundIndex, screen]
ELSE systemColor[graph.target[info.xy].colorIndex];

IF info.xy = x THEN { OPEN graph.target[x];
IF value < realRect.x OR value > realRect.x + realRect.w THEN RETURN; 
rect _ [x: RealToScreen[handle, value, x] - UnitLineWidth*width*0.5, y: axesRect.y+1.0,
w: UnitLineWidth*width, h: axesRect.h-2.0];
}
ELSE { OPEN graph.target[y];
IF value < realRect.y OR value > realRect.y + realRect.h THEN RETURN; 
rect _ [x: axesRect.x+1.0, y: RealToScreen[handle, value, y] - UnitLineWidth*width*0.5,
w: axesRect.w-2.0, h: UnitLineWidth*width];
};
context.SetColor[tcolor];
context.MaskRectangle[rect];
};
context.DoSaveAll[targetProc];
}; -- DrawTargets

DrawRope: PROC[context: Imager.Context, text: ROPE, x0, y0: REAL, justifX: JustifX, justifY: JustifY, color: Imager.Color, font: ImagerFont.Font, rotation: REAL] = {
IF ~text.IsEmpty[] THEN {
showTextProc: PROC = {
context.TranslateT[[x0, y0]];
context.RotateT[rotation];
context.SetXY[[xmin, ymin]];
context.SetColor[color];
context.SetFont[font];
context.ShowRope[text];
}; -- showTextProc
extents: ImagerFont.Extents;
xmin, ymin, width, height: REAL;
extents _ ImagerFont.RopeBoundingBox[font: font, rope: text];
width _ extents.rightExtent - extents.leftExtent;
height _ extents.descent + extents.ascent;
xmin_ SELECT justifX FROM
right => - width - extents.leftExtent,
center => - width/2.0 - extents.leftExtent,
ENDCASE => - extents.leftExtent;
ymin_ SELECT justifY FROM
top => - height + extents.descent,
center => - height/2.0 + extents.descent,
ENDCASE => extents.descent;
context.DoSaveAll[showTextProc];
};
}; -- DrawRope

DrawTexts: DrawProc = {
OPEN handle, handle.axesRect;
FOR tl: Texts _ graph.texts, tl.rest UNTIL tl = NIL DO
t: Text _ tl.first;
DrawRope[context, t.text, t.place.x * w + x, t.place.y * h + y, t.justifX, t.justifY,
systemColor[t.colorIndex], imagerFonts[paintInfo.output][t.fontIndex], t.rotation];
ENDLOOP;
}; -- DrawTexts

DrawText: DrawProc = {
OPEN handle, handle.axesRect;
t: Text _ paintInfo.text;
DrawRope[context, t.text, t.place.x * w + x, t.place.y * h + y, t.justifX, t.justifY,
GetTextColor[handle, t], imagerFonts[paintInfo.output][t.fontIndex], t.rotation];
}; -- DrawText

ScaleAxes: PROC[handle: GraphHandle] = { OPEN handle;
nDivX, nDivY: INT;
invalidDiv: BOOL _ graph.division[x] < 1 OR graph.division[y] < 1;
invalidBounds: BOOL _ (graph.bounds.xmin >= graph.bounds.xmax) OR
(graph.bounds.ymin >= graph.bounds.ymax);
ScaleAxis: PROC [minDataValue, maxDataValue, axisSize: REAL, nDiv: INT] RETURNS [min, range, step, factor: REAL] = {
max: REAL _ maxDataValue;
min _ minDataValue;
range _ max - min;
step _ range/nDiv;
IF graph.auto[bounds] THEN {
step _ FindStepSize[range, nDiv];
min _ AlignEnd[minDataValue, step, FALSE];
max _ AlignEnd[maxDataValue, step, TRUE];
range _ max - min;
IF NOT graph.auto[divisions] THEN step _ range/nDiv;
};
factor _ axisSize/range;
}; -- ScaleAxis
IF invalidBounds OR graph.auto[bounds] THEN {
graph.bounds _ DataBounds[graph.entityList, graph.bounds];
IF mergingBounds THEN {
graph.bounds _ [
xmin: MIN[boundsToMerge.xmin, graph.bounds.xmin],
ymin: MIN[boundsToMerge.ymin, graph.bounds.ymin],
xmax: MAX[boundsToMerge.xmax, graph.bounds.xmax],
ymax: MAX[boundsToMerge.ymax, graph.bounds.ymax]
];
};
IF NOT graph.auto[bounds] THEN BlinkMsg["Bounds invalid. (xmin >= xmax or ymin >= ymax.)"];
};

IF graph.auto[divisions] OR invalidDiv THEN { -- 5/8 = 0.625
labelFont: ImagerFont.Font _ imagerFonts[paintInfo.output][0];
maxX: ROPE _ Convert.RopeFromReal[graph.bounds.xmax];
minX: ROPE _ Convert.RopeFromReal[graph.bounds.xmin];
wMaxX, wMinX, width, height: REAL;
[wMaxX, height] _ RopeSize[maxX, labelFont];
[wMinX, ] _ RopeSize[minX, labelFont];
width _ MAX[wMaxX, wMinX];
nDivX _ MAX[1, MIN[10, Real.RoundLI[axesRect.w/width*0.625]]];
nDivY _ MAX[1, MIN[10, Real.RoundLI[axesRect.h/height*0.625]]];
IF NOT graph.auto[divisions] THEN BlinkMsg["Divisions must be >= 2"];
}
ELSE {
nDivX _ graph.division[x];
nDivY _ graph.division[y];
};

[realRect.x, realRect.w, step[x], scale[x]] _ ScaleAxis[
graph.bounds.xmin, graph.bounds.xmax, axesRect.w, nDivX];
[realRect.y, realRect.h, step[y], scale[y]] _ ScaleAxis[
graph.bounds.ymin, graph.bounds.ymax, axesRect.h, nDivY];

}; -- ScaleAxes

FindStepSize: PROC [range: REAL, nSteps: CARDINAL] RETURNS [step: REAL] = {
logRange:  REAL;
logMext, minStep:  REAL;
exp:  INTEGER;
steps:  ARRAY [0..6) OF REAL = [0.2, 0.5, 1.0, 2.0, 5.0, 10.0];

logRange _ RealFns.Log[10.0, range];
exp _ Real.FixI[logRange];
logMext _ logRange - exp;
IF logRange < 0.0 THEN {
exp _ exp - 1;
logMext _ logMext + 1.0};
minStep _ RealFns.Power[10.0, logMext]/nSteps;
FOR i: CARDINAL IN [0..5) DO
step _ steps[i];
IF step > minStep OR Almost[step, minStep] THEN EXIT
ENDLOOP;
IF exp >= 0 THEN THROUGH [1..exp] DO step _ step*10.0 ENDLOOP
ELSE THROUGH [1..-exp] DO step _ step/10.0 ENDLOOP;
step _ MAX[1.0, step];
}; -- FindStepSize

AlignEnd: PROC [e, step:  REAL, roundUp:  BOOL] RETURNS [ae:  REAL] = {
absE: REAL = ABS[e];
nSteps: INTEGER;
xend: REAL;

IF e = 0.0 THEN RETURN[0.0];
IF e < 0.0 THEN roundUp _ ~roundUp;
nSteps _ Real.RoundLI[absE/step];
xend _ step*nSteps;
IF Almost[nSteps, absE/step] THEN ae _ xend
ELSE IF roundUp
THEN {ae _ IF xend >= absE THEN xend ELSE step*(nSteps + 1)}
ELSE {ae _ IF xend <= absE THEN xend ELSE step*(nSteps - 1)};
IF e < 0.0 THEN ae _ -ae;
}; -- AlignEnd

DrawAxes: DrawProc = {
axesProc: PROC = { OPEN handle;
color: Imager.Color _ ForegroundColor[backgroundIndex, paintInfo.output];
rect: Imager.Rectangle _ axesRect;
border: Imager.PathProc = { OPEN rect;
xmax: REAL = x + w;
ymax: REAL = y + h;
moveTo[[x, y]];
lineTo[[x, ymax]];
lineTo[[xmax, ymax]];
lineTo[[xmax, y]];
};
context.SetColor[color];
context.SetStrokeEnd[square];
context.SetStrokeJoint[round];
context.SetStrokeWidth[UnitLineWidth*2.0];
context.MaskStroke[path: border, closed: TRUE];
};
context.DoSaveAll[axesProc];
}; -- DrawAxes

DrawTicks: PROC[context: Imager.Context, handle: GraphHandle, xyChoice: XY _ x, drawLabel: BOOL _ FALSE] = { OPEN handle;
ticksProc: PROC = {
tickCount: CARDINAL; -- max tick count, starting from 0.
tickLen, textPlace, tick: REAL;
gridsOn: BOOL _ graph.grids[xyChoice];
stdColor: Imager.Color _ GetStandardColor[handle];
stdFont: ImagerFont.Font _ imagerFonts[paintInfo.output][0];
context.SetColor[stdColor];
context.SetStrokeEnd[butt];
context.SetStrokeWidth[UnitLineWidth];

IF xyChoice = x THEN { -- x ticks (on horizontal axis)
tickLen _ IF gridsOn THEN axesRect.h ELSE axesRect.h/50.0;
tickCount _ Real.RoundI[realRect.w/step[x]];
textPlace _ axesRect.y - TextHeightFudge;
FOR i: CARDINAL IN [0..tickCount] DO
tick _ step[x]*scale[x]*i;
IF drawLabel THEN DrawRope[context, Convert.RopeFromReal[step[x]*i + realRect.x],
axesRect.x + tick, textPlace, center, top, stdColor, stdFont, 0.0];
IF i # 0 AND i # tickCount THEN {
xPos: REAL = axesRect.x + tick;
yStart: REAL _ axesRect.y;
yEnd: REAL _ axesRect.y + tickLen;
Tick: Imager.PathProc = {moveTo[[xPos, yStart]]; lineTo[[xPos, yEnd]]};
context.MaskStroke[path: Tick, closed: FALSE];
IF NOT gridsOn THEN {
yStart _ axesRect.y + axesRect.h; yEnd _ yStart - tickLen; 
context.MaskStroke[path: Tick, closed: FALSE];
};
};
ENDLOOP;
}
ELSE {
tickLen _ IF gridsOn THEN axesRect.w ELSE axesRect.w/50.0;
tickCount _ Real.RoundI[realRect.h/step[y]];
textPlace _ axesRect.x - TextWidthFudge;

FOR i: CARDINAL IN [0..tickCount] DO
tick _ step[y]*scale[y]*i;
IF drawLabel THEN DrawRope[context, Convert.RopeFromReal[step[y]*i + realRect.y],
textPlace, axesRect.y + tick, right, center, stdColor, stdFont, 0.0];
IF i # 0 AND i # tickCount THEN {
yPos: REAL = axesRect.y + tick;
xStart: REAL _ axesRect.x;
xEnd: REAL _ axesRect.x + tickLen;
Tick: Imager.PathProc = {moveTo[[xStart, yPos]]; lineTo[[xEnd, yPos]]};
context.MaskStroke[path: Tick, closed: FALSE];
IF NOT gridsOn THEN {
xStart _ axesRect.x + axesRect.w; xEnd _ xStart - tickLen; 
context.MaskStroke[path: Tick, closed: FALSE];
};
};
ENDLOOP;
};
};
context.DoSaveAll[ticksProc];
}; -- DrawTicks

DrawLegend: DrawProc = { OPEN handle;
MaxEntries: INT = 12;
MaxEntriesPerColumn: INT = MaxEntries/2;
notYet: BOOL _ paintInfo.entity # NIL;
irow, icol: INT _ 0;
AdvanceRC: PROC [] RETURNS [ok: BOOL _ TRUE]= {
IF irow = MaxEntries THEN ok _ FALSE
ELSE IF icol = 2 AND irow = MaxEntriesPerColumn THEN ok _ FALSE
ELSE IF icol = 0 THEN {irow _ 1; icol _ IF normalLegend THEN 1 ELSE 3}
ELSE {
IF normalLegend AND (irow = MaxEntriesPerColumn) THEN {icol _ icol + 1; irow _ 1}
ELSE irow _ irow + 1;
};
}; -- AdvanceRC

FOR el: EntityList _ graph.entityList, el.rest UNTIL el = NIL DO
IF AdvanceRC[] THEN {
IF notYet AND paintInfo.entity # NIL THEN
IF el.first = paintInfo.entity THEN notYet _ FALSE;
IF NOT notYet THEN {
IF el.first.colorIndex = 0 THEN -- auto color selection for white curves.
lastEntityColor _ el.first.colorIndex _ IF lastEntityColor = LastEntityColor THEN 1
ELSE lastEntityColor + 1;
DrawLegendEntry[context, handle, el.first, icol, irow];
IF paintInfo.onlyOne THEN EXIT;
};
}
ELSE EXIT;
ENDLOOP;
IF AdvanceRC[] AND NOT paintInfo.onlyOne THEN
DrawLegendEntry[context, handle, NIL, icol, irow]; -- blank
}; -- DrawLegend

DrawLegendEntry: PROC [context: Imager.Context, handle: GraphHandle, entity: Entity, icol, irow: INT] = { OPEN handle;
legendProc: PROC = {
lFont: ImagerFont.Font _ imagerFonts[paintInfo.output][1];
legendH: REAL _ FontHeight[lFont];
labelH: REAL _ FontHeight[imagerFonts[paintInfo.output][0]];
legendW: REAL _ IF normalLegend THEN axesRect.w*0.5 ELSE shortLegendW;
lx1: REAL _ SELECT icol FROM
1 => axesRect.x, 2 => axesRect.x + legendW,
ENDCASE => axesRect.x + axesRect.w + 2;
ty: REAL _ axesRect.y - legendH*irow + (SELECT icol FROM
1, 2 => - (labelH + TextHeightFudge + TextHeightFudge),
ENDCASE => axesRect.h);

IF paintInfo.output = screen THEN { -- clear
context.SetColor[BackgroundColor[backgroundIndex, paintInfo.output]];
context.MaskRectangle[[lx1, ty, legendW, legendH]];
};
context.ClipRectangle[[lx1, ty, legendW, legendH]];
IF paintInfo.action = paint AND entity # NIL THEN {
lColor: Imager.Color _ GetEntityColor[handle, entity];
lineLength: REAL _ IF entity.colorIndex IN [8..9] THEN 31.0 ELSE 34.0;
lx2: REAL _ IF normalLegend THEN lx1 + 34.0 ELSE lx1;
tx: REAL _ lx2 + TextWidthFudge;
ly: REAL _ ty + legendH*0.5;
IF normalLegend THEN {
context.SetStrokeEnd[butt];
context.SetStrokeWidth[UnitLineWidth*entity.width];
context.SetColor[lColor];
IF colorMode = color THEN context.MaskVector[[lx1, ly], [lx2, ly]]
ELSE {
bwLineState^ _ [];
MaskLineSeg[context, [tx, ly], [lx1+lineLength, ly], entity.colorIndex, bwLineState]
};
};
DrawRope[context, FullName[entity], tx, ty, left, bottom, lColor, lFont, 0.0];
};
}; -- proc
context.DoSaveAll[legendProc];
}; -- DrawLegendEntry

DrawEntities: DrawProc = { OPEN handle;
IF graph.entityList # NIL THEN {
entitiesProc: PROC = {
context.ClipRectangle[axesRect];
FOR el: EntityList _ graph.entityList, el.rest UNTIL el = NIL DO
entity: Entity _ el.first;
IF entity = NIL THEN LOOP; -- error ?!
IF entity.colorIndex = 0 THEN -- auto color selection for white curves.
lastEntityColor _ entity.colorIndex _ IF lastEntityColor = LastEntityColor THEN 1
ELSE lastEntityColor + 1;
IF handle.colorMode = bw THEN DrawBWEntity[context, handle, entity]
ELSE DrawColorEntity[context, handle, entity];
ENDLOOP;
}; -- entitiesProc
context.DoSaveAll[entitiesProc];
};
}; -- DrawEntities

DrawBWEntity: PROC [context: Imager.Context, handle: GraphHandle, entity: Entity] = { OPEN handle;
oneCurve: PROC = {
first, prevOk, currOk: BOOL _ TRUE;
lastVec, newVec: Imager.VEC; -- places on screen.
xseg: SegmentDataList _ entity.group.x.segments;
eColor: Imager.Color _ GetEntityColor[handle, entity];
bwLineState^ _ [];
context.SetColor[eColor];
context.TranslateT[[axesRect.x, axesRect.y]];
context.SetStrokeJoint[mitered];
context.SetStrokeEnd[butt];
context.SetStrokeWidth[UnitLineWidth*entity.width];
FOR yseg: SegmentDataList _ entity.segments, yseg.rest UNTIL yseg = NIL DO
IF xseg = NIL THEN EXIT;
currOk _ NotANan[xseg.first.end] AND NotANan[yseg.first.end];
IF currOk THEN newVec _
[(xseg.first.end-realRect.x)*scale[x], (yseg.first.end-realRect.y)*scale[y]];
IF first THEN first _ FALSE
ELSE IF currOk AND prevOk THEN MaskLineSeg[context, lastVec, newVec, entity.colorIndex, bwLineState];
IF entity.mark # none AND currOk THEN {
eFont: ImagerFont.Font _ imagerFonts[paintInfo.output][IF entity.mark > cross THEN 0 ELSE LAST[FontIndex]];
DrawRope[context, GraphConvert.CharRopeFromMark[entity.mark],
newVec.x, newVec.y, center, center, eColor, eFont, 0.0];
};
lastVec _ newVec;
prevOk _ currOk;
xseg _ xseg.rest;
ENDLOOP;
};
context.DoSaveAll[oneCurve];
}; -- DrawBWEntity

DrawColorEntity: PROC[context: Imager.Context, handle: GraphHandle, entity: Entity] = { OPEN handle;
oneCurve: PROC = {
xseg: SegmentDataList;
curve: Imager.PathProc = {
first, currOk: BOOL _ TRUE;
prevOk: BOOL _ FALSE;
xseg _ entity.group.x.segments;
FOR yseg: SegmentDataList _ entity.segments, yseg.rest UNTIL yseg = NIL DO
vec: Imager.VEC;
IF xseg = NIL THEN EXIT;
currOk _ NotANan[xseg.first.end] AND NotANan[yseg.first.end];
IF currOk THEN {
vec _ [(xseg.first.end-realRect.x)*scale[x], (yseg.first.end-realRect.y)*scale[y]];
IF prevOk THEN lineTo[vec] ELSE moveTo[vec];
};
prevOk _ currOk;
xseg _ xseg.rest;
ENDLOOP;
};
eColor: Imager.Color _ GetEntityColor[handle, entity];
context.SetColor[eColor];
context.SetStrokeJoint[mitered];
context.SetStrokeEnd[butt];
context.SetStrokeWidth[entity.width];
context.TranslateT[[axesRect.x, axesRect.y]];
context.SetXY[[axesRect.x, axesRect.y]];
context.MaskStroke[path: curve, closed: FALSE];

IF entity.mark # none THEN {
xseg _ entity.group.x.segments;
FOR yseg: SegmentDataList _ entity.segments, yseg.rest UNTIL yseg = NIL DO
vec: Imager.VEC;
IF NotANan[xseg.first.end] AND NotANan[yseg.first.end] THEN {
eFont: ImagerFont.Font _ imagerFonts[paintInfo.output][IF entity.mark > cross THEN 0 ELSE LAST[FontIndex]];
vec _ [(xseg.first.end-realRect.x)*scale[x], (yseg.first.end-realRect.y)*scale[y]];
DrawRope[context, GraphConvert.CharRopeFromMark[entity.mark],
vec.x, vec.y, center, center, eColor, eFont, 0.0];
};
xseg _ xseg.rest;
ENDLOOP;
};
};
context.DoSaveAll[oneCurve];
}; -- DrawColorEntity

LineShape: TYPE = {solid, dot, dash, longDash};
StepSize: ARRAY LineShape[dot..longDash] OF REAL = [3.0, 6.0, 9.0];
LineLimit: ARRAY LineShape[dot..longDash] OF REAL = [1.0, 4.0, 7.0]; -- beyond which is space.

shape: ARRAY EntityColor OF ARRAY StepCount OF LineShape = [
[solid, solid, solid, solid, solid, solid], -- solid, useless
[dot, dot, dot, dot, dot, dot], -- dot
[dash, dash, dash, dash, dash, dash], -- dash
[longDash, longDash, longDash, longDash, longDash, longDash], -- longDash
[dot, dash, dot, dash, dot, dash], -- dot-dash
[dot, longDash, dot, longDash, dot, longDash], -- dot-longDash
[dot, dot, dash, dot, dot, dash], -- dot-dot-dash
[dot, dot, longDash, dot, dot, longDash], -- dot-dot-longDash
[dot, dash, dash, dot, dash, dash], -- dot-dash-dash
[dot, longDash, longDash, dot, longDash, longDash], -- dot-longDash-longDash
[dash, longDash, dash, longDash, dash, longDash], -- dash-longDash
[dot, dash, longDash, dot, dash, longDash] -- dot-dash-longDash
];

MaskLineSeg: PROC[context: Imager.Context,
v0, v1: Imager.VEC _ [0.0, 0.0], style: EntityColor _ 1, state: BWLineState _ NIL] = {
IF Almost[v0.x, v1.x] AND Almost[v0.y, v1.y] THEN RETURN;
IF state = NIL THEN {bwLineState^ _ []; state _ bwLineState};
IF style = 1 THEN context.MaskVector[v0, v1]
ELSE { -- Note that normally state.step and state.progress will be updated.
dx: REAL = v1.x - v0.x;
dy: REAL = v1.y - v0.y;
lengthToGo: REAL _ RealFns.SqRt[dx*dx + dy*dy];
cosine: REAL _ dx/lengthToGo;
sine: REAL _ dy/lengthToGo;
newVec, oldVec: Imager.VEC _ v0;
stepSize, lineLimit, increment: REAL;
drawIt: BOOL;
UNTIL Almost[lengthToGo, 0.0] DO
stepSize_ StepSize[shape[style][state.step]];
lineLimit_ LineLimit[shape[style][state.step]];
IF state.progress < lineLimit THEN {
drawIt _ TRUE;
increment _ MIN[lengthToGo, lineLimit - state.progress];
}
ELSE {
drawIt _ FALSE;
increment _ MIN[lengthToGo, stepSize - state.progress];
};
lengthToGo _ lengthToGo - increment;
state.progress _ state.progress + increment;
newVec _ [oldVec.x + cosine*increment, oldVec.y + sine*increment];
IF drawIt THEN context.MaskVector[oldVec, newVec]
ELSE IF Almost[state.progress, stepSize] THEN {
state.step _ (state.step + 1) MOD MaxStep;
state.progress _ 0.0;
};
oldVec _ newVec;
ENDLOOP;
};
}; -- MaskLineSeg

DrawEntity: DrawProc = {
OPEN handle;
entity: Entity _ handle.paintInfo.entity;
IF entity # NIL THEN {
entityProc: PROC = {
IF entity.colorIndex = 0 THEN -- auto color selection for white curves.
lastEntityColor _ entity.colorIndex _ IF lastEntityColor = LastEntityColor THEN 1
ELSE lastEntityColor + 1;
context.ClipRectangle[axesRect];
IF colorMode = bw THEN DrawBWEntity[context, handle, entity]
ELSE DrawColorEntity[context, handle, entity];
};
context.DoSaveAll[entityProc];
};
}; -- DrawEntity


DrawTails: DrawProc = {
OPEN handle;
info: PaintInfo _ handle.paintInfo;
drawTails: PROC = {
v1: ValueList _ info.v1;
v2: ValueList _ info.v2;
entity: Entity;
vec1, vec2: Imager.VEC;

oneSegment: PROC = {
context.SetStrokeWidth[UnitLineWidth*entity.width];
context.SetColor[GetEntityColor[handle, entity]];
IF colorMode = bw THEN {
bwLineState^ _ [];
MaskLineSeg[context, vec1, vec2, entity.colorIndex, bwLineState];
}
ELSE context.MaskVector[vec1, vec2];
}; -- oneSegment

context.SetStrokeEnd[square];
context.ClipRectangle[axesRect];
context.TranslateT[[axesRect.x, axesRect.y]];
IF NotANumber[info.x1] THEN RETURN ELSE vec1.x _ (info.x1 - realRect.x)*scale[x];
IF NotANumber[info.x2] THEN RETURN ELSE vec2.x _ (info.x2 - realRect.x)*scale[x];
FOR el: EntityList _ graph.entityList, el.rest UNTIL el = NIL DO
ysOk: BOOL _ TRUE;
entity _ el.first;
IF NotANumber[v1.first] THEN ysOk _ FALSE
ELSE vec1.y _ (v1.first - realRect.y)*scale[y];
IF ysOk THEN
IF NotANumber[v2.first] THEN ysOk _ FALSE
ELSE vec2.y _ (v2.first - realRect.y)*scale[y];
IF entity.colorIndex = 0 THEN -- auto color selection for white curves.
lastEntityColor _ entity.colorIndex _ IF lastEntityColor = LastEntityColor THEN 1
ELSE lastEntityColor + 1;
IF ysOk THEN context.DoSaveAll[oneSegment];
IF (v1 _ v1.rest) = NIL OR (v2 _ v2.rest) = NIL THEN EXIT;
ENDLOOP;
}; -- drawTails

context.DoSaveAll[drawTails];
}; -- DrawTails

GetEntityColor: PROC [handle: GraphHandle, entity: Entity] RETURNS [Imager.Color] = {
OPEN handle;
RETURN[
IF paintInfo.action = erase THEN BackgroundColor[backgroundIndex, paintInfo.output]
ELSE IF colorMode = bw THEN ForegroundColor[backgroundIndex, paintInfo.output]
ELSE systemColor[entity.colorIndex]
];
}; -- GetEntityColor

GetTextColor: PROC [handle: GraphHandle, text: Text] RETURNS [Imager.Color] = {
OPEN handle;
RETURN[
IF paintInfo.action = erase THEN BackgroundColor[backgroundIndex, paintInfo.output]
ELSE systemColor[text.colorIndex]
];
}; -- GetTextColor

GetStandardColor: PROC [handle: GraphHandle] RETURNS [Imager.Color] = {
OPEN handle;
RETURN[
IF paintInfo.action = paint THEN ForegroundColor[handle.backgroundIndex, paintInfo.output]
ELSE BackgroundColor[handle.backgroundIndex, paintInfo.output]
];
}; -- GetStandardColor

PrintCaretsInfo: DrawProc = { OPEN handle;
caretsProc: PROC = {
xh1: CaretSpec _ graph.caret[primary];
xh2: CaretSpec _ graph.caret[secondary];
xh3: CaretSpec _ graph.caret[text];
cvec: Imager.VEC;
cColor: Imager.Color _ ForegroundColor[backgroundIndex, interpress];
context.SetColor[cColor];
context.SetStrokeWidth[UnitLineWidth];
context.SetStrokeEnd[butt];
IF xh1.on THEN {
cvec _ RealVecToScreenVec[handle, xh1.place];
context.MaskVector[[cvec.x - 17.0, cvec.y], [cvec.x + 17.0, cvec.y]];
context.MaskVector[[cvec.x, cvec.y - 17.0], [cvec.x, cvec.y + 17.0]];
};
IF xh2.on THEN {
cvec _ RealVecToScreenVec[handle, xh2.place];
bwLineState^ _ [];
MaskLineSeg[context, [cvec.x - 17.0, cvec.y], [cvec.x + 17.0, cvec.y], 2, bwLineState];
bwLineState^ _ [];
MaskLineSeg[context, [cvec.x, cvec.y - 17.0], [cvec.x, cvec.y + 17.0], 2, bwLineState];
};
IF xh3.on THEN {
cvec _ RealVecToScreenVec[handle, xh3.place];
context.MaskVector[[cvec.x - 17.0, cvec.y], [cvec.x + 17.0, cvec.y]];
context.MaskVector[[cvec.x - 12.0, cvec.y + 12.0], [cvec.x + 12.0, cvec.y - 12.0]];
context.MaskVector[[cvec.x - 12.0, cvec.y - 12.0], [cvec.x + 12.0, cvec.y + 12.0]];
};
IF xh1.on OR xh2.on THEN {
bothOn: BOOL _ xh1.on AND xh2.on;
rope: ROPE _ Rope.Concat["Crosshair", IF bothOn THEN "s: " ELSE ": "];
IF xh1.on THEN rope _ rope.Concat[GraphConvert.RopeOfPlace[xh1.place]];
IF bothOn THEN rope _ rope.Concat[", "];
IF xh2.on THEN rope _ rope.Concat[GraphConvert.RopeOfPlace[xh2.place]];
IF bothOn THEN rope _ rope.Cat["; slope: ",
GraphConvert.RopeOfSlope[xh1.place, xh2.place]];
DrawRope[context, rope, axesRect.x, axesRect.y + axesRect.h, left, bottom,
cColor, imagerFonts[paintInfo.output][0], 0.0];
}; 
};
context.DoSaveAll[caretsProc];
}; -- PrintCaretsInfo
}.

CHANGE LOG.
SChen, created at October 9, 1985 6:13:12 pm PDT.
dGraphDraw.mesa, Copyright c 1985 by Xerox Corporation.  All rights reserved.
Last Edited by:
Sweetsun Chen, November 21, 1985 10:55:01 pm PST

constants
global vars
type:
procs
IF NOT autoRepaint THEN GraphCarets.Suspend[];
x: PaintXsegInfo => DrawCrossSegments[context, handle, c];
x: PaintPlaceInfo => DrawXhairPlaces[context, handle, x];
IF NOT autoRepaint THEN GraphCarets.Resume[];
All drawing procs below are called by Draw above, which gurantees context, handle, and handle.paintInfo not nil.
IF info.output = screen, the following vars on handle are updated: axesRec, realRec, scale, step.
useful values
vars to save some output device dependent values before making interpress master.
resume altered values after making interpress master.
update carets places on graph viewer.
draw x target or y target depending on info.xy.
erasing action can happen only in screen painting
font and color should be set before calling this proc. x0 and y0 are in screen coordinates.
IF text.IsEmpty[] THEN RETURN[[x0, y0]];
RETURN[IF output = interpress THEN [x0 + width, y0 + height] ELSE ImagerBackdoor.GetCP[context]];
vars on handle referenced: graph.bounds, axesRect.w, axesRect.h, graph.division, graph.auto;
updates vars on handle: realRect, scale, step.
IF Almost[min, max] THEN {max _ max + 50.0; min _ min - 50.0}; -- won't happen, see below.

bounds checking
divisions
scaling
graph.bounds _ [realRect.x, realRect.y, realRect.x + realRect.w, realRect.y + realRect.h];
graph.division _ [Real.RoundLI[realRect.w/step[x]], Real.RoundLI[realRect.h/step[y]]];
IF Almost[range, 0.0] THEN range _ 100.0;
vars on handle referenced: backgroundIndex, paintInfo.output, axesRect.
must be painting instead of erasing.
global const/vars refrenced: UnitLineWidth, TextHeightFudge.
vars on handle referenced: graph.grids[xyChoice], backgroundIndex, paintInfo.output, imagerFont[paintInfo.output][0], axesRect, realRect, scale, step, fgColor, stdFont.

vertical axis
If normalLegend {icol = 1..2, irow = 1..6} otherwise {icol = 3, irow = 1..12}.
DrawRope[context, entity.name, tx, ty, left, bottom, lColor, lFont];
color is the foreground color for use when colormode = black-and-white.
this proc is called by DrawGraph only, when paint action = paint instead of erase.
Remember to clip any rectangles before calling this proc.
Remember to clip any rectangles before calling this proc.
Remember to clip any rectangles, set the color and width before calling this proc.
DrawLegend[context, handle, entity];
DrawCrossSegments: PROC[context: Imager.Context, handle: GraphHandle _ NIL, info: PaintXsegInfo _ NIL] = { OPEN handle;
FOR el: EntityList _ graph.entityList, el.rest UNTIL el = NIL DO
entity: Entity _ el.first;
vx: ValueList _ entity.group.x;
vy: ValueList _ entity.newValues;
v1, v2: Imager.VEC;
[v1, v2] _ CrossSegment[vx, vy, 
ENDLOOP;
}; -- DrawCrossSegments
caller must make sure that info.v1 and info.v2 are of the same length as graph.entityList.
choose the right color for painting entity and legend.
choose the right color for painting entity and legend.
choose the drawing color for axes, ticks, grids, targets, and labels on axes, whether painting or erasing.
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