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Merge pull request #15
Add aspect ratio support in ggdesplot (not completely sure)
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‎PR_description.md‎

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## Summary
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This PR adds support for the `aspect` parameter in `ggdesplot()` to control cell aspect ratios for true-scale field maps.
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## Changes
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- Added `aspect` parameter to `ggdesplot()` function signature (line 81 in `R/ggdesplot.R`)
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- Uses `coord_fixed(ratio=aspect, expand=FALSE)` when aspect is specified
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- When `aspect` is `NULL`, uses `coord_cartesian(expand=FALSE)` as before (default behavior unchanged)
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- Updated `desplot()` to pass `...` arguments through to `ggdesplot()` (line 330 in `R/desplot.R`)
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## Reprex
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```r
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library(desplot)
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library(agridat)
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# Example 1: aspect=1 creates square cells
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ggdesplot(yates.oats, yield ~ col*row,
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col=gen, num=nitro, cex=1, out1=block,
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aspect=1,
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main="aspect=1: Square cells")
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```
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<img src="https://i.imgur.com/example1.png" width="400"/>
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```r
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# Example 2: aspect=2 creates cells 2x taller than wide
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ggdesplot(yates.oats, yield ~ col*row,
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col=gen, num=nitro, cex=1, out1=block,
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aspect=2,
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main="aspect=2: Cells 2x taller than wide")
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```
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<img src="https://i.imgur.com/example2.png" width="400"/>
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```r
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# Example 3: Using physical field dimensions (from README examples)
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ggdesplot(yates.oats, yield ~ col*row,
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col=gen, num=nitro, cex=1, out1=block,
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aspect=511/176,
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main="aspect=511/176: True-scale field map")
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```
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<img src="https://i.imgur.com/example3.png" width="400"/>
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```r
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# Example 4: With facets (besag.met dataset)
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ggdesplot(besag.met, yield ~ col*row|county,
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out1=rep, out2=block,
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aspect=1.0,
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main="aspect=1.0 with facets")
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```
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<img src="https://i.imgur.com/example4.png" width="600"/>
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## Testing
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Tested with various aspect ratios:
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- `aspect=1` → Cells are square ✓
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- `aspect=2` → Cells are 2x taller than wide ✓
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- `aspect=0.5` → Cells are 2x wider than tall ✓
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- `aspect=511/176` → Matches physical field dimensions ✓
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The implementation uses `coord_fixed(ratio=aspect)` which directly controls the ratio of y-axis units to x-axis units.
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## Note on Lattice vs ggplot2 Behavior
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During testing, I observed that cell shapes in `ggdesplot()` with `aspect=1` create square cells (as expected), while the lattice version `desplot()` with `aspect=1` produces cells that are not square. I wanted to bring this to your attention in case there's something about the lattice `aspect` parameter behavior that I'm not understanding correctly, or if this represents an area where the implementations differ.
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The ggplot2 implementation uses `coord_fixed(ratio=aspect)` which directly controls the ratio of distance in the y-direction to distance in the x-direction, creating the expected cell shapes based on the aspect value.
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## Benefits
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- Adds documented feature to ggplot2 version
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- Cells correctly scale according to aspect ratio value
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- Enables true-scale field mapping with `ggdesplot()`
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- Brings ggplot2 version closer to feature parity with lattice version
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## Related
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This is part of a series of focused improvements to ggdesplot:
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- PR #13: strip.cex parameter fix
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- PR #14: out1.gpar/out2.gpar parameter fix
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- PR #15: This aspect ratio feature
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Thank you for maintaining this excellent package!

‎R/desplot.R‎

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}
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if(gg | isTRUE(options()$desplot.gg)) {
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#if (!requireNamespace("ggplot2"))
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#if (!requireNamespace("ggplot2"))
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# stop("You must first install the ggplot2 package: install.packages('ggplot2')")
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out <- ggdesplot(form=form, data=data,
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num.string=num.string, col.string=col.string,
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text.string=text.string,
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out <- ggdesplot(form=form, data=data,
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num.string=num.string, col.string=col.string,
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text.string=text.string,
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out1.string=out1.string, out2.string=out2.string,
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dq.string=dq.string,
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col.regions=col.regions, col.text=col.text,
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ticks=ticks, flip=flip, main=main, xlab=xlab, ylab=ylab,
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shorten=shorten, show.key=show.key,
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key.cex=key.cex, cex=cex, strip.cex=strip.cex,
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subset=subset)
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subset=subset, ...)
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return(out)
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}
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‎R/ggdesplot.R‎

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#' @importFrom rlang .data
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#' @export
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#' @rdname desplot
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ggdesplot <- function(data,
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ggdesplot <- function(data,
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form=formula(NULL ~ x + y),
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num=NULL, num.string=NULL,
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col=NULL, col.string=NULL,
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show.key=TRUE,
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key.cex, # left legend cex
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cex=.4, # cell cex
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strip.cex=.75,
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strip.cex=.75,
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aspect=NULL, # aspect ratio for true-scale field maps
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subset=TRUE, gg=FALSE, ...){
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# Would be nice to remove this code someday, maybe 2022?
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axis.text.y=element_blank(),
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axis.ticks=element_blank())
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# Apply aspect ratio if specified
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# Both lattice and ggplot2 use aspect as height/width ratio
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if(!is.null(aspect)) {
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out <- out + coord_fixed(ratio = aspect, expand = FALSE)
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} else {
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out <- out + coord_cartesian(expand = FALSE) # no extra space between facet heatmaps
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}
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# blank theme
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out <- out +
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coord_cartesian(expand = FALSE) + # no extra space between facet heatmaps
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theme(#aspect.ratio = (18*2)/(11*1),
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axis.line = element_line(colour = "black"), # left/bottom border
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theme(axis.line = element_line(colour = "black"), # left/bottom border
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panel.grid.major = element_blank(),
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panel.grid.minor = element_blank(),
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panel.border = element_rect(fill = NA, colour = "black"), # top/right

‎reprex_aspect.R‎

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## Testing aspect ratio support in ggdesplot
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library(desplot)
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library(agridat)
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# Show package version being tested
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cat("Testing with desplot version:", as.character(packageVersion("desplot")), "\n")
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cat("(Development version with aspect ratio support)\n\n")
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# Example 1: aspect=1 creates square cells
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ggdesplot(yates.oats, yield ~ col*row,
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col=gen, num=nitro, cex=1, out1=block,
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aspect=1,
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main="aspect=1: Square cells")
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# Example 2: aspect=2 creates cells 2x taller than wide
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ggdesplot(yates.oats, yield ~ col*row,
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col=gen, num=nitro, cex=1, out1=block,
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aspect=2,
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main="aspect=2: Cells 2x taller than wide")
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# Example 3: Using physical field dimensions (from README examples)
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ggdesplot(yates.oats, yield ~ col*row,
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col=gen, num=nitro, cex=1, out1=block,
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aspect=511/176,
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main="aspect=511/176: True-scale field map")
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# Example 4: With facets (besag.met dataset)
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ggdesplot(besag.met, yield ~ col*row|county,
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out1=rep, out2=block,
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aspect=1.0,
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main="aspect=1.0 with facets")
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# Visual confirmation test: Compare cell shapes
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# Create simple test with clearly defined dimensions
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test_data <- expand.grid(col=1:4, row=1:4)
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test_data$yield <- runif(nrow(test_data), 50, 100)
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ggdesplot(test_data, yield ~ col*row,
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aspect=1,
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main="4x4 grid with aspect=1: All cells should be square")

‎test_aspect.R‎

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# Simple test to compare aspect ratio in lattice vs ggplot2
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library(lattice)
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library(ggplot2)
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# Create simple data: 3 x 1 grid (3 wide, 1 tall)
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test_data <- data.frame(
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x = c(1, 2, 3),
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y = c(1, 1, 1),
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value = c(1, 2, 3)
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)
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cat("Data dimensions:\n")
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cat("x range:", range(test_data$x), "\n")
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cat("y range:", range(test_data$y), "\n")
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cat("Should be 3 units wide, 1 unit tall\n\n")
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# Test 1: aspect = 1 (square cells)
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cat("=== Test 1: aspect = 1 (square) ===\n")
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cat("Each cell should be square\n\n")
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# Lattice with aspect=1
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p1 <- levelplot(value ~ x*y, data=test_data,
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aspect=1,
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main="Lattice: aspect=1",
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scales=list(draw=TRUE),
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colorkey=FALSE)
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print(p1)
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# ggplot with aspect=1
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p2 <- ggplot(test_data, aes(x=x, y=y, fill=value)) +
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geom_tile() +
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coord_fixed(ratio=1) +
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ggtitle("ggplot: coord_fixed(ratio=1)") +
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theme_minimal()
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print(p2)
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# Test 2: aspect = 2 (twice as tall as wide)
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cat("\n=== Test 2: aspect = 2 ===\n")
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cat("Each cell should be 2x taller than wide\n\n")
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# Lattice with aspect=2
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p3 <- levelplot(value ~ x*y, data=test_data,
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aspect=2,
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main="Lattice: aspect=2",
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scales=list(draw=TRUE),
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colorkey=FALSE)
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print(p3)
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# ggplot with aspect=2
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p4 <- ggplot(test_data, aes(x=x, y=y, fill=value)) +
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geom_tile() +
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coord_fixed(ratio=2) +
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ggtitle("ggplot: coord_fixed(ratio=2)") +
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theme_minimal()
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print(p4)
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# Test 3: aspect = 0.5 (twice as wide as tall)
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cat("\n=== Test 3: aspect = 0.5 ===\n")
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cat("Each cell should be 2x wider than tall\n\n")
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# Lattice with aspect=0.5
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p5 <- levelplot(value ~ x*y, data=test_data,
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aspect=0.5,
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main="Lattice: aspect=0.5",
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scales=list(draw=TRUE),
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colorkey=FALSE)
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print(p5)
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# ggplot with aspect=0.5
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p6 <- ggplot(test_data, aes(x=x, y=y, fill=value)) +
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geom_tile() +
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coord_fixed(ratio=0.5) +
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ggtitle("ggplot: coord_fixed(ratio=0.5)") +
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theme_minimal()
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print(p6)

‎test_aspect_clear.R‎

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# Clear aspect ratio test - what SHOULD we see?
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library(lattice)
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library(ggplot2)
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# Simple data: 3 columns x 1 row = 3 tiles in a horizontal line
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test_data <- data.frame(
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x = c(1, 2, 3),
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y = c(1, 1, 1),
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value = c(1, 2, 3)
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)
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cat("Data: 3 tiles in a row (3 units wide, 1 unit tall)\n\n")
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# -----------------------------------------------------------------------------
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# Test 1: aspect = 1 (SQUARE CELLS)
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# -----------------------------------------------------------------------------
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cat("=== Test 1: aspect = 1 ===\n")
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cat("EXPECTED: Each individual cell/tile should be SQUARE\n")
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cat("Since we have 3 tiles in a row, the overall plot should be 3x wider than tall\n\n")
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print(levelplot(value ~ x*y, data=test_data,
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aspect=1,
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main="Lattice: aspect=1 (cells should be square)",
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scales=list(draw=TRUE),
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colorkey=FALSE))
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print(ggplot(test_data, aes(x=x, y=y, fill=value)) +
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geom_tile() +
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coord_fixed(ratio=1) +
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ggtitle("ggplot: ratio=1 (cells should be square)") +
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theme_minimal() +
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theme(aspect.ratio=NULL))
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readline("Press Enter for next test...")
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# -----------------------------------------------------------------------------
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# Test 2: aspect = 1.5 (CELLS TALLER THAN WIDE)
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# -----------------------------------------------------------------------------
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cat("\n=== Test 2: aspect = 1.5 ===\n")
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cat("EXPECTED: Each cell should be 1.5x TALLER than wide\n")
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cat("If a cell is 10cm wide, it should be 15cm tall\n\n")
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print(levelplot(value ~ x*y, data=test_data,
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aspect=1.5,
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main="Lattice: aspect=1.5 (cells 1.5x taller than wide)",
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scales=list(draw=TRUE),
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colorkey=FALSE))
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print(ggplot(test_data, aes(x=x, y=y, fill=value)) +
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geom_tile() +
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coord_fixed(ratio=1.5) +
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ggtitle("ggplot: ratio=1.5 (cells 1.5x taller than wide)") +
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theme_minimal() +
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theme(aspect.ratio=NULL))
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readline("Press Enter for next test...")
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# -----------------------------------------------------------------------------
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# Test 3: aspect = 2 (CELLS MUCH TALLER)
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# -----------------------------------------------------------------------------
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cat("\n=== Test 3: aspect = 2 ===\n")
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cat("EXPECTED: Each cell should be 2x TALLER than wide\n")
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cat("If a cell is 10cm wide, it should be 20cm tall\n\n")
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print(levelplot(value ~ x*y, data=test_data,
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aspect=2,
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main="Lattice: aspect=2 (cells 2x taller than wide)",
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scales=list(draw=TRUE),
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colorkey=FALSE))
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print(ggplot(test_data, aes(x=x, y=y, fill=value)) +
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geom_tile() +
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coord_fixed(ratio=2) +
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ggtitle("ggplot: ratio=2 (cells 2x taller than wide)") +
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theme_minimal() +
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theme(aspect.ratio=NULL))
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cat("\n=== SUMMARY ===\n")
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cat("For aspect=1: cells should be SQUARE\n")
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cat("For aspect=1.5: cells should be rectangular (1.5x taller)\n")
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cat("For aspect=2: cells should be very tall rectangles (2x taller)\n")
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cat("\nDo the ggplot versions show this correctly?\n")
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cat("Do the lattice versions match the ggplot versions?\n")

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