Inconsistent formals for `StatIdentity$compute_layer`

[coolbutuseless]

The formals for compute_layer in the majority of the Stats in ggplot2 are c(self, data, params, layout)

Two Stats are different from the others: StatBindot and StatIdentity.

Is there a reason for the different formals for these 2 stats? Is this just a leftover from earlier version?

I'm certain the StatIdentity$compute_layer and StatBindot$compute_layer argument names don't matter (either passed through or ignored) but it may be worth fixing for consistency

# formals for `compute_layer` across all Stats
Stat                [1] "self"   "data"   "params" "layout"
StatBin             [1] "self"   "data"   "params" "layout"
StatBin2d           [1] "self"   "data"   "params" "layout"
StatBindot          [1] "self"   "data"   "params" "panels"
StatBinhex          [1] "self"   "data"   "params" "layout"
StatBoxplot         [1] "self"   "data"   "params" "layout"
StatContour         [1] "self"   "data"   "params" "layout"
StatCount           [1] "self"   "data"   "params" "layout"
StatDensity         [1] "self"   "data"   "params" "layout"
StatDensity2d       [1] "self"   "data"   "params" "layout"
StatEcdf            [1] "self"   "data"   "params" "layout"
StatEllipse         [1] "self"   "data"   "params" "layout"
StatFunction        [1] "self"   "data"   "params" "layout"
StatIdentity        [1] "data"   "scales" "params"
StatQq              [1] "self"   "data"   "params" "layout"
StatQqLine          [1] "self"   "data"   "params" "layout"
StatQuantile        [1] "self"   "data"   "params" "layout"
StatSf              [1] "self"   "data"   "params" "layout"
StatSfCoordinates   [1] "self"   "data"   "params" "layout"
StatSmooth          [1] "self"   "data"   "params" "layout"
StatSum             [1] "self"   "data"   "params" "layout"
StatSummary         [1] "self"   "data"   "params" "layout"
StatSummary2d       [1] "self"   "data"   "params" "layout"
StatSummaryBin      [1] "self"   "data"   "params" "layout"
StatSummaryHex      [1] "self"   "data"   "params" "layout"
StatUnique          [1] "self"   "data"   "params" "layout"
StatYdensity        [1] "self"   "data"   "params" "layout"

[yutannihilation]

Thanks. I quickly checked the code.

• StatIdentity seems safe to fix because only data is used.
• StatBindot might needs some care, but it seems no CRAN packages use this (c.f. https://github.com/search?q=org%3Acran+%28StatBindot+OR+bindot%29+-repo%3Acran%2Fggplot2&type=Code). So I think this is also OK to fix.

Let me see if there are some historical reasons.

[yutannihilation]

• StatIdentity$compute_layer() was added by this commit: 66b9df7
• StatBindot$compute_layer() was added by this commit: 09faf05

I found no special reason to keep them as is. It seems just because the common set of formals was data, scales, ... at that time (c.f. 8af983b#diff-2b0d9305b6b639cd9de20829bd3e66b2R63). So, probably we can fix them.

BTW,

Two Stats are different from the others

this is correct, but actually ggplot2 has only three compute_layer() methods.

$ git grep "compute_layer = "
R/position-.r:  compute_layer = function(self, data, params, layout) {
R/position-identity.r:  compute_layer = function(data, params, scales) {
R/position-jitter.r:  compute_layer = function(data, params, panel) {
R/position-nudge.R:  compute_layer = function(data, params, panel) {
R/stat-.r:  compute_layer = function(self, data, params, layout) {
R/stat-bindot.r:  compute_layer = function(self, data, params, panels) {
R/stat-identity.r:  compute_layer = function(data, scales, params) {

Oh, and positions might be good to fix as well.

[thomasp85]

@yutannihilation can you make a PR for this?

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