/usr/lib/open-axiom/src/algebra/plottool.spad is in open-axiom-source 1.4.1+svn~2626-2ubuntu2.
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)abbrev package PLOTTOOL PlotTools
++ Author:
++ Date Created:
++ Date Last Updated:
++ Keywords:
++ Examples:
++ References:
++ Description:
++ This package exports plotting tools
PlotTools(): Exports == Implementation where
L ==> List
-- Pt ==> TwoDimensionalPoint
SEG ==> Segment
SF ==> DoubleFloat
Pt ==> Point(SF)
PLOT ==> Plot
DROP ==> DrawOption
S ==> String
VIEW2D ==> TwoDimensionalViewport
Exports ==> with
calcRanges: L L Pt -> L SEG SF
++ calcRanges(l) \undocumented
Implementation ==> add
import GraphicsDefaults
import PLOT
import TwoDimensionalPlotClipping
import DrawOptionFunctions0
import ViewportPackage
import POINT
import PointPackage(SF)
--%Local functions
xRange0: L Pt -> SEG SF
xRange: L L Pt -> SEG SF
yRange0: L Pt -> SEG SF
yRange: L L Pt -> SEG SF
drawToScaleRanges: (SEG SF,SEG SF) -> L SEG SF
drawToScaleRanges(xVals,yVals) ==
xDiff := (xHi := hi xVals) - (xLo := lo xVals)
yDiff := (yHi := hi yVals) - (yLo := lo yVals)
pad := abs(yDiff - xDiff)/2
yDiff > xDiff => [segment(xLo - pad,xHi + pad),yVals]
[xVals,segment(yLo - pad,yHi + pad)]
select : (L Pt,Pt -> SF,(SF,SF) -> SF) -> SF
select(l,f,g) ==
m := f first l
for p in rest l repeat m := g(m,f p)
m
xRange0(list:L Pt) == select(list,xCoord,min) .. select(list,xCoord,max)
yRange0(list:L Pt) == select(list,yCoord,min) .. select(list,yCoord,max)
select2: (L L Pt,L Pt -> SF,(SF,SF) -> SF) -> SF
select2(l,f,g) ==
m := f first l
for p in rest l repeat m := g(m,f p)
m
xRange(list:L L Pt) ==
select2(list,lo(xRange0(#1)),min) .. select2(list,hi(xRange0(#1)),max)
yRange(list:L L Pt) ==
select2(list,lo(yRange0(#1)),min) .. select2(list,hi(yRange0(#1)),max)
--%Exported Functions
calcRanges(llp) ==
drawToScale() => drawToScaleRanges(xRange llp, yRange llp)
[xRange llp, yRange llp]
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