Plot 33

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### Inquiries: email 2to32minus1@gmail.com

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### Globals

fontScale = 1.2 # Global font size variable

lf = 1.2 # Enlarge font of plot labels

verbose = FALSE # Verbose printing

lw = 2 # Line width

xMargin = 1 # X-axis margin for plots

yMargin = 1 # Y-axis margin for plots

de = 0.01 # Small constant for estimating derivatives numerically

smlPts = 1 # Small data point/circle

medPts = 1.5 # Medium data point/circle

lrgPts = 2.0 # Large data point/circle

### Run this function to generate this plot

runFunc = function() {

dw = 1000

dh = 750

path = "D:/Code/R/LeastSquaresPlay/PlotsAndAssocCode/Plot33/"

savePngVerbose( paste(path, "Plot33.png", sep=""), lensFocusMockup, w=900, h=600, un="px" )

}

# Mockup lens parabolic auto-focus parameter estimation

lensFocusMockup = function() {

x = c( 2, 4, 6, 8, 10, 12 )

y = c( 10, 6, 5, 4.8, 6.25, 10.3 )

plotTitle = "Lens Auto-Focus Parabolic Estimation Mockup"

plot( x, y, ylim=c(0, max(y)+2), main=plotTitle, ylab="Edge Width (px)", xlab="Focus Motor Position", cex.main=1.3, cex.axis=1.3, cex.lab=1.3, cex=2.0, lwd=2 )

lmFit = lm( y ~ x + I(x^2) )

coeff = lmFit$coefficients

xPred = seq( x[1] - 1, x[length(x)] + 1, length=100 )

yPred = evalPoly( xPred, coeff )

lines( xPred, yPred, col="blue", lwd=lw )

a = coeff[3]; b = coeff[2]; c = coeff[1]

focusPointX = -b/(2*a)

focusPointY = a * focusPointX^2 + b * focusPointX + c

minY = gpl()$yLim[1]

arrows( focusPointX, minY, focusPointX, focusPointY, col="magenta", lwd=lw, angle=15, length = 0.3 )

}

### Compute f(x) for a polynomial and a vector of x-coordinates

evalPoly = function( x, coeff ) {

if ( length( coeff ) < 1 ) return( c(0) )

termSum = 0

for ( i in 1:length(coeff) ) {

termSum = termSum + coeff[i] * x^(i-1)

}

return( termSum )

}

### Get Plot Limits : gpl()$xLim[1] --> left x-coord

gpl = function() {

u = par( "usr" )

return( list( xLim=u[1:2], yLim=u[3:4] ) )

}

### Save to PNG file, specify width and height

savePngVerbose = function( path, plotFunc, w=512, h=512, un="px", doCopyright=TRUE, ... ) {

png( filename = path, type="cairo", units=un, width=w, height=h, pointsize=12, res=96 )

plotFunc( ... )

if ( doCopyright )

addCopyright()

dev.off()

}

### Add copyright notice to plot via text()

addCopyright = function() {

mtext( "Email: 2to32minus1@gmail.com", side=4, line=1, adj=0, cex=1.1 )

}

runFunc()