A table containing the piano keys coordinates. Each piano key is centered at the midi note value it represents.
Format
A data frame with 127 rows and 6 variables:
- midi
integer from 0 - 127 containing the midi pitches
- layer
integer 1 or 2 depending on whether key is white (1) or black (2)
- xmin
xmin coordinate of the key
- ymin
ymin coordinate of the key
- xmax
xmax coordinate of the key
- ymax
ymax coordinate of the key
Examples
library(ggplot2)
# Print dataframe:
piano_keys_coordinates
#> # A tibble: 128 × 6
#> midi layer xmin ymin xmax ymax
#> <int> <dbl> <dbl> <dbl> <dbl> <dbl>
#> 1 0 1 -0.5 0 1.21 1
#> 2 1 2 0.568 0.333 1.57 1
#> 3 2 1 1.21 0 2.93 1
#> 4 3 2 2.61 0.333 3.61 1
#> 5 4 1 2.93 0 4.64 1
#> 6 5 1 4.64 0 6.36 1
#> 7 6 2 5.63 0.333 6.63 1
#> 8 7 1 6.36 0 8.07 1
#> 9 8 2 7.57 0.333 8.57 1
#> 10 9 1 8.07 0 9.79 1
#> # ℹ 118 more rows
# Plot the keyboard:
piano_keys_coordinates %>%
# plot white keys first that they don't cover half of the black keys:
dplyr::arrange(layer) %>%
ggplot(aes(ymin = ymin, ymax = ymax, xmin = xmin, xmax = xmax, fill = factor(layer))) +
geom_rect(color = "black", show.legend = FALSE) +
scale_fill_manual(values = c("#ffffdd", "#113300")) +
coord_fixed(ratio = 10)
