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Update layout and description text for ggplot2 comparison vignette #980

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Dec 7, 2024
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Update layout and description text for ggplot2 comparison vignette #980

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16 changes: 13 additions & 3 deletions vignettes/03_versus_ggplot2.Rmd
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Expand Up @@ -50,8 +50,11 @@ data(World, metro, rivers, land)
#tmap_design_mode()
```

## Choropleth Map comparision

## Choropleth
An example of how the default output of `tmap` compares with `ggplot2`.

This is the default output of `ggplot2`:

```{r}
library(ggplot2)
Expand All @@ -65,6 +68,8 @@ ggplot(World) +
```


This is the default output of `tmap`:

```{r}
tm_shape(World, crs = "+proj=eqearth") +
tm_polygons(fill = "HPI",
Expand All @@ -73,12 +78,17 @@ tm_shape(World, crs = "+proj=eqearth") +
fill.scale = tm_scale_continuous(values = "pu_gn", midpoint = 35))
```

Note the different line width values. The unit of a line width is different. tmap follows the lwd parameter (see [graphics::par]) whereas in ggplot2 `linewidth = 1` equals roughly 0.75 [due to a historical error](https://ggplot2.tidyverse.org/articles/ggplot2-specs.html#linewidth)
Note the different line width values:

- `linewidth = .4` in `ggplot2`
- `lwd = 1` in `tmap`

The unit of a line width is different. `tmap` follows the `lwd` parameter (see [`graphics::par`](https://www.rdocumentation.org/packages/graphics/versions/3.6.2/topics/par)) whereas in `ggplot2` `linewidth = 1` equals roughly 0.75 [due to a historical error](https://ggplot2.tidyverse.org/articles/ggplot2-specs.html#linewidth).


## Mimicking ggplot2 layout

Using tmap to match the style of ggplot2:
We can use `tmap` to match the style of `ggplot2`:

```{r}
tm_shape(World, crs = "+proj=eqearth") +
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