From 4286d1111e9fb1819d0b0d7a259340300440435f Mon Sep 17 00:00:00 2001
From: schochastics <david@schochastics.net>
Date: Tue, 24 Jun 2025 11:14:23 +0200
Subject: [PATCH 01/18] adjust loop size for multi loops

---
 R/plot.R | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/R/plot.R b/R/plot.R
index 43c75141150..db1b4f88cec 100644
--- a/R/plot.R
+++ b/R/plot.R
@@ -539,6 +539,14 @@ plot.igraph <- function(
 
     xx0 <- layout[loops.v, 1] + cos(la) * vs
     yy0 <- layout[loops.v, 2] - sin(la) * vs
+
+    loop_table <- table(loops.v)
+    loop_idx <- ave(seq_along(loops.v), loops.v, FUN = seq_along)
+    base_loop_size <- loop.size
+    loop_increment <- 0.5
+
+    adjusted_loop_size <- base_loop_size + (loop_idx - 1) * loop_increment
+
     mapply(
       loop,
       xx0,
@@ -556,7 +564,8 @@ plot.igraph <- function(
       arrow.size = asize,
       arr.w = arrow.width,
       lab.x = loop.labx,
-      lab.y = loop.laby
+      lab.y = loop.laby,
+      loopSize = adjusted_loop_size
     )
   }
 

From 69dee27cc0b1f7d5404813009f92e112688a2d5a Mon Sep 17 00:00:00 2001
From: schochastics <david@schochastics.net>
Date: Tue, 24 Jun 2025 21:12:55 +0200
Subject: [PATCH 02/18] decreased loop increment size

---
 R/plot.R | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/R/plot.R b/R/plot.R
index db1b4f88cec..972b5df0a9a 100644
--- a/R/plot.R
+++ b/R/plot.R
@@ -543,7 +543,7 @@ plot.igraph <- function(
     loop_table <- table(loops.v)
     loop_idx <- ave(seq_along(loops.v), loops.v, FUN = seq_along)
     base_loop_size <- loop.size
-    loop_increment <- 0.5
+    loop_increment <- 0.25
 
     adjusted_loop_size <- base_loop_size + (loop_idx - 1) * loop_increment
 

From 738b484464e96db57f5b81d21f5dc10210b7d08d Mon Sep 17 00:00:00 2001
From: schochastics <david@schochastics.net>
Date: Tue, 24 Jun 2025 22:04:50 +0200
Subject: [PATCH 03/18] put loops in largest empty gap

---
 R/plot.R | 62 +++++++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 50 insertions(+), 12 deletions(-)

diff --git a/R/plot.R b/R/plot.R
index 972b5df0a9a..1bbfd97ec79 100644
--- a/R/plot.R
+++ b/R/plot.R
@@ -439,13 +439,17 @@ plot.igraph <- function(
         ncol = 2,
         byrow = TRUE
       )
-      phi <- atan2(cp[, 2] - center[2], cp[, 1] - center[1])
-      r <- sqrt((cp[, 1] - center[1])**2 + (cp[, 2] - center[2])**2)
+      # Translate to local coordinates
+      cp_centered <- cp -
+        matrix(rep(center, each = nrow(cp)), ncol = 2, byrow = FALSE)
 
-      phi <- phi + rad
+      # Rotate all control points around the center
+      rotation_matrix <- matrix(c(cos(rad), -sin(rad), sin(rad), cos(rad)), ncol = 2)
+      cp_rotated <- t(rotation_matrix %*% t(cp_centered))
 
-      cp[, 1] <- cx + r * cos(phi)
-      cp[, 2] <- cy + r * sin(phi)
+      # Translate back to global coordinates
+      cp <- cp_rotated +
+        matrix(rep(center, each = nrow(cp_rotated)), ncol = 2, byrow = FALSE)
 
       if (is.na(width)) {
         width <- 1
@@ -504,10 +508,10 @@ plot.igraph <- function(
     if (length(edge.width) > 1) {
       ew <- ew[loops.e]
     }
-    la <- loop.angle
-    if (length(loop.angle) > 1) {
-      la <- la[loops.e]
-    }
+    # la <- loop.angle
+    # if (length(loop.angle) > 1) {
+    #   la <- la[loops.e]
+    # }
     lty <- edge.lty
     if (length(edge.lty) > 1) {
       lty <- lty[loops.e]
@@ -537,9 +541,6 @@ plot.igraph <- function(
       lcex <- lcex[loops.e]
     }
 
-    xx0 <- layout[loops.v, 1] + cos(la) * vs
-    yy0 <- layout[loops.v, 2] - sin(la) * vs
-
     loop_table <- table(loops.v)
     loop_idx <- ave(seq_along(loops.v), loops.v, FUN = seq_along)
     base_loop_size <- loop.size
@@ -547,6 +548,43 @@ plot.igraph <- function(
 
     adjusted_loop_size <- base_loop_size + (loop_idx - 1) * loop_increment
 
+    la <- sapply(loops.v, function(v) {
+      # Get all incident non-loop edges
+      incident_edges <- incident(graph, v, mode = "all")
+      incident_edges <- incident_edges[!which_loop(graph)[incident_edges]]
+
+      if (length(incident_edges) == 0) {
+        return(0)
+      }
+
+      # Compute angles to the *other* node of each edge
+      angles <- sapply(incident_edges, function(e) {
+        ends_e <- ends(graph, e)
+        other <- if (as.numeric(ends_e[1]) == v) {
+          as.numeric(ends_e[2])
+        } else {
+          as.numeric(ends_e[1])
+        }
+        dx <- layout[other, 1] - layout[v, 1]
+        dy <- layout[other, 2] - layout[v, 2]
+        atan2(dy, dx)
+      })
+
+      # Normalize and sort
+      angles <- (angles + 2 * pi) %% (2 * pi)
+      angles <- sort(angles)
+
+      if (length(angles) == 0) {
+        return(0) # Default angle if isolated node
+      } else {
+        gaps <- diff(c(angles, angles[1] + 2 * pi)) # wrap around
+        max_gap_index <- which.max(gaps)
+        (angles[max_gap_index] + gaps[max_gap_index] / 2) %% (2 * pi)
+      }
+    })
+    xx0 <- layout[loops.v, 1] + cos(la) * vs
+    yy0 <- layout[loops.v, 2] + sin(la) * vs
+    ### CHANGED/ADDED: Dynamically calculate loop.angle based on largest gap
     mapply(
       loop,
       xx0,

From 5ab009f9335bdd9553d4ebdb53fc87db0cfa2be0 Mon Sep 17 00:00:00 2001
From: schochastics <david@schochastics.net>
Date: Tue, 24 Jun 2025 22:06:53 +0200
Subject: [PATCH 04/18] removed debug comments

---
 R/plot.R | 2 --
 1 file changed, 2 deletions(-)

diff --git a/R/plot.R b/R/plot.R
index 1bbfd97ec79..9ca46484a00 100644
--- a/R/plot.R
+++ b/R/plot.R
@@ -549,7 +549,6 @@ plot.igraph <- function(
     adjusted_loop_size <- base_loop_size + (loop_idx - 1) * loop_increment
 
     la <- sapply(loops.v, function(v) {
-      # Get all incident non-loop edges
       incident_edges <- incident(graph, v, mode = "all")
       incident_edges <- incident_edges[!which_loop(graph)[incident_edges]]
 
@@ -557,7 +556,6 @@ plot.igraph <- function(
         return(0)
       }
 
-      # Compute angles to the *other* node of each edge
       angles <- sapply(incident_edges, function(e) {
         ends_e <- ends(graph, e)
         other <- if (as.numeric(ends_e[1]) == v) {

From 3585a0c85bb3c53cdc4b25ae3871e4a2e3641d3e Mon Sep 17 00:00:00 2001
From: schochastics <david@schochastics.net>
Date: Wed, 25 Jun 2025 09:11:06 +0200
Subject: [PATCH 05/18] make edge.loop.angle work with dynamic angles

---
 R/plot.R        | 21 +++++++++++++--------
 R/plot.common.R |  4 ++--
 2 files changed, 15 insertions(+), 10 deletions(-)

diff --git a/R/plot.R b/R/plot.R
index 9ca46484a00..0f6131915e5 100644
--- a/R/plot.R
+++ b/R/plot.R
@@ -508,10 +508,10 @@ plot.igraph <- function(
     if (length(edge.width) > 1) {
       ew <- ew[loops.e]
     }
-    # la <- loop.angle
-    # if (length(loop.angle) > 1) {
-    #   la <- la[loops.e]
-    # }
+    la <- loop.angle
+    if (length(loop.angle) > 1) {
+      la <- la[loops.e]
+    }
     lty <- edge.lty
     if (length(edge.lty) > 1) {
       lty <- lty[loops.e]
@@ -541,6 +541,7 @@ plot.igraph <- function(
       lcex <- lcex[loops.e]
     }
 
+    # Get the number of loops per vertex to optimally align them
     loop_table <- table(loops.v)
     loop_idx <- ave(seq_along(loops.v), loops.v, FUN = seq_along)
     base_loop_size <- loop.size
@@ -548,7 +549,8 @@ plot.igraph <- function(
 
     adjusted_loop_size <- base_loop_size + (loop_idx - 1) * loop_increment
 
-    la <- sapply(loops.v, function(v) {
+    # Calculate the angles for the loops to fit in the largest gap
+    la_dyn <- sapply(loops.v, function(v) {
       incident_edges <- incident(graph, v, mode = "all")
       incident_edges <- incident_edges[!which_loop(graph)[incident_edges]]
 
@@ -568,21 +570,24 @@ plot.igraph <- function(
         atan2(dy, dx)
       })
 
-      # Normalize and sort
       angles <- (angles + 2 * pi) %% (2 * pi)
       angles <- sort(angles)
 
       if (length(angles) == 0) {
         return(0) # Default angle if isolated node
       } else {
-        gaps <- diff(c(angles, angles[1] + 2 * pi)) # wrap around
+        gaps <- diff(c(angles, angles[1] + 2 * pi))
         max_gap_index <- which.max(gaps)
         (angles[max_gap_index] + gaps[max_gap_index] / 2) %% (2 * pi)
       }
     })
+    if (length(la) == 1) {
+      la <- rep(la, length(loops.v))
+    }
+    la[is.na(la)] <- la_dyn[is.na(la)]
     xx0 <- layout[loops.v, 1] + cos(la) * vs
     yy0 <- layout[loops.v, 2] + sin(la) * vs
-    ### CHANGED/ADDED: Dynamically calculate loop.angle based on largest gap
+
     mapply(
       loop,
       xx0,
diff --git a/R/plot.common.R b/R/plot.common.R
index 06a3327b9b9..81b0c3c6d61 100644
--- a/R/plot.common.R
+++ b/R/plot.common.R
@@ -355,7 +355,7 @@
 #'   Gives the angle in radians for plotting loop edges.
 #'   See the `label.dist` vertex parameter to see how this is interpreted.
 #'
-#'   The default value is 0.
+#'   The default value is NA. This means that the loop edges will be drawn in the largest gap possible.
 #' }
 #' \item{loop.angle2}{
 #'   Gives the second angle in radians for plotting loop edges.
@@ -4886,7 +4886,7 @@ i.edge.default <- list(
   label = i.get.edge.labels,
   lty = 1,
   width = 1,
-  loop.angle = 0,
+  loop.angle = NA,
   loop.angle2 = 0,
   label.family = "serif",
   label.font = 1,

From c585b93bae6f8a75d8455514c5d90c4b65aa7f96 Mon Sep 17 00:00:00 2001
From: schochastics <david@schochastics.net>
Date: Wed, 25 Jun 2025 09:54:17 +0200
Subject: [PATCH 06/18] place loops next to each other rather than on top

---
 R/plot.R | 91 +++++++++++++++++++++++++++++++++++---------------------
 1 file changed, 57 insertions(+), 34 deletions(-)

diff --git a/R/plot.R b/R/plot.R
index 0f6131915e5..f209406d72f 100644
--- a/R/plot.R
+++ b/R/plot.R
@@ -421,7 +421,8 @@ plot.igraph <- function(
       arr.w = arr.w,
       lab.x,
       lab.y,
-      loopSize = loop.size
+      loopSize = loop.size,
+      narrowing = 1
     ) {
       rad <- angle
       center <- c(cx, cy)
@@ -430,9 +431,9 @@ plot.igraph <- function(
           x0,
           y0,
           x0 + .4 * loopSize,
-          y0 + .2 * loopSize,
+          y0 + narrowing * .2 * loopSize,
           x0 + .4 * loopSize,
-          y0 - .2 * loopSize,
+          y0 - narrowing * .2 * loopSize,
           x0,
           y0
         ),
@@ -442,7 +443,7 @@ plot.igraph <- function(
       # Translate to local coordinates
       cp_centered <- cp -
         matrix(rep(center, each = nrow(cp)), ncol = 2, byrow = FALSE)
-
+      print(cp_centered)
       # Rotate all control points around the center
       rotation_matrix <- matrix(c(cos(rad), -sin(rad), sin(rad), cos(rad)), ncol = 2)
       cp_rotated <- t(rotation_matrix %*% t(cp_centered))
@@ -541,53 +542,74 @@ plot.igraph <- function(
       lcex <- lcex[loops.e]
     }
 
-    # Get the number of loops per vertex to optimally align them
+    # For each loop, assign unique angle within largest gap (flower petal style)
+    la_dyn <- numeric(length(loops.v)) # one angle per loop
+
     loop_table <- table(loops.v)
     loop_idx <- ave(seq_along(loops.v), loops.v, FUN = seq_along)
-    base_loop_size <- loop.size
-    loop_increment <- 0.25
+    loop_count <- loop_table[as.character(loops.v)]
+    narrowing <- pmax(0.3, 1 - (loop_count - 1) * 0.15)
 
-    adjusted_loop_size <- base_loop_size + (loop_idx - 1) * loop_increment
+    for (v in unique(loops.v)) {
+      idx <- which(loops.v == v)
 
-    # Calculate the angles for the loops to fit in the largest gap
-    la_dyn <- sapply(loops.v, function(v) {
+      # Find largest angular gap for this vertex
       incident_edges <- incident(graph, v, mode = "all")
       incident_edges <- incident_edges[!which_loop(graph)[incident_edges]]
 
       if (length(incident_edges) == 0) {
-        return(0)
-      }
-
-      angles <- sapply(incident_edges, function(e) {
-        ends_e <- ends(graph, e)
-        other <- if (as.numeric(ends_e[1]) == v) {
-          as.numeric(ends_e[2])
-        } else {
-          as.numeric(ends_e[1])
-        }
-        dx <- layout[other, 1] - layout[v, 1]
-        dy <- layout[other, 2] - layout[v, 2]
-        atan2(dy, dx)
-      })
-
-      angles <- (angles + 2 * pi) %% (2 * pi)
-      angles <- sort(angles)
-
-      if (length(angles) == 0) {
-        return(0) # Default angle if isolated node
+        # No neighbors, spread loops in full circle
+        loop_angles <- seq(0, 2 * pi, length.out = length(idx) + 1)[-1]
       } else {
+        angles <- sapply(incident_edges, function(e) {
+          ends_e <- ends(graph, e)
+          other <- if (as.numeric(ends_e[1]) == v) {
+            as.numeric(ends_e[2])
+          } else {
+            as.numeric(ends_e[1])
+          }
+          dx <- layout[other, 1] - layout[v, 1]
+          dy <- layout[other, 2] - layout[v, 2]
+          atan2(dy, dx)
+        })
+
+        angles <- (angles + 2 * pi) %% (2 * pi)
+        angles <- sort(angles)
         gaps <- diff(c(angles, angles[1] + 2 * pi))
         max_gap_index <- which.max(gaps)
-        (angles[max_gap_index] + gaps[max_gap_index] / 2) %% (2 * pi)
+
+        gap_start <- angles[max_gap_index]
+        gap_end <- (gap_start + gaps[max_gap_index]) %% (2 * pi)
+
+        # Generate equally spaced angles inside the gap
+        if (gap_end > gap_start) {
+          loop_angles <- seq(gap_start, gap_end, length.out = length(idx) + 2)[
+            -c(1, length(idx) + 2)
+          ]
+        } else {
+          # wrapped gap
+          gap_end <- gap_end + 2 * pi
+          loop_angles <- seq(gap_start, gap_end, length.out = length(idx) + 2)[
+            -c(1, length(idx) + 2)
+          ] %%
+            (2 * pi)
+        }
       }
-    })
+
+      la_dyn[idx] <- loop_angles
+    }
     if (length(la) == 1) {
       la <- rep(la, length(loops.v))
     }
     la[is.na(la)] <- la_dyn[is.na(la)]
+    # === BEGIN: improved loop size/placement ===
+    # All loops same size, but different directions like flower petals
+    adjusted_loop_size <- rep(loop.size, length(loops.v))
+
+    # Position loop attachment points using per-loop angles
     xx0 <- layout[loops.v, 1] + cos(la) * vs
     yy0 <- layout[loops.v, 2] + sin(la) * vs
-
+    # === END: loop placement ===
     mapply(
       loop,
       xx0,
@@ -606,7 +628,8 @@ plot.igraph <- function(
       arr.w = arrow.width,
       lab.x = loop.labx,
       lab.y = loop.laby,
-      loopSize = adjusted_loop_size
+      loopSize = adjusted_loop_size,
+      narrowing = narrowing
     )
   }
 

From a78bc5a08e869bce177dcece6c46a093ddf33470 Mon Sep 17 00:00:00 2001
From: schochastics <david@schochastics.net>
Date: Wed, 25 Jun 2025 09:55:57 +0200
Subject: [PATCH 07/18] removed debug comments

---
 R/plot.R | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/R/plot.R b/R/plot.R
index f209406d72f..566d229afe3 100644
--- a/R/plot.R
+++ b/R/plot.R
@@ -440,15 +440,12 @@ plot.igraph <- function(
         ncol = 2,
         byrow = TRUE
       )
-      # Translate to local coordinates
       cp_centered <- cp -
         matrix(rep(center, each = nrow(cp)), ncol = 2, byrow = FALSE)
-      print(cp_centered)
-      # Rotate all control points around the center
+
       rotation_matrix <- matrix(c(cos(rad), -sin(rad), sin(rad), cos(rad)), ncol = 2)
       cp_rotated <- t(rotation_matrix %*% t(cp_centered))
 
-      # Translate back to global coordinates
       cp <- cp_rotated +
         matrix(rep(center, each = nrow(cp_rotated)), ncol = 2, byrow = FALSE)
 
@@ -543,7 +540,7 @@ plot.igraph <- function(
     }
 
     # For each loop, assign unique angle within largest gap (flower petal style)
-    la_dyn <- numeric(length(loops.v)) # one angle per loop
+    la_dyn <- numeric(length(loops.v))
 
     loop_table <- table(loops.v)
     loop_idx <- ave(seq_along(loops.v), loops.v, FUN = seq_along)
@@ -553,7 +550,6 @@ plot.igraph <- function(
     for (v in unique(loops.v)) {
       idx <- which(loops.v == v)
 
-      # Find largest angular gap for this vertex
       incident_edges <- incident(graph, v, mode = "all")
       incident_edges <- incident_edges[!which_loop(graph)[incident_edges]]
 
@@ -602,14 +598,12 @@ plot.igraph <- function(
       la <- rep(la, length(loops.v))
     }
     la[is.na(la)] <- la_dyn[is.na(la)]
-    # === BEGIN: improved loop size/placement ===
     # All loops same size, but different directions like flower petals
     adjusted_loop_size <- rep(loop.size, length(loops.v))
 
-    # Position loop attachment points using per-loop angles
     xx0 <- layout[loops.v, 1] + cos(la) * vs
     yy0 <- layout[loops.v, 2] + sin(la) * vs
-    # === END: loop placement ===
+
     mapply(
       loop,
       xx0,

From 180c54c71e6a1da51ff82f388d541baa1a28e905 Mon Sep 17 00:00:00 2001
From: schochastics <david@schochastics.net>
Date: Wed, 25 Jun 2025 11:06:59 +0200
Subject: [PATCH 08/18] fixed label placement and added tests

---
 R/plot.R                                      | 15 ++---
 .../_snaps/plot/basic-graph-layout-1.svg      |  2 +-
 .../_snaps/plot/basic-graph-layout-2.svg      |  2 +-
 .../_snaps/plot/basic-graph-spheres.svg       |  2 +-
 tests/testthat/_snaps/plot/loop-graph.svg     | 24 ++++----
 .../testthat/_snaps/plot/multi-loops-many.svg | 56 +++++++++++++++++++
 .../_snaps/plot/multi-loops-triangle.svg      | 44 +++++++++++++++
 tests/testthat/test-plot.R                    | 29 +++++++++-
 8 files changed, 149 insertions(+), 25 deletions(-)
 create mode 100644 tests/testthat/_snaps/plot/multi-loops-many.svg
 create mode 100644 tests/testthat/_snaps/plot/multi-loops-triangle.svg

diff --git a/R/plot.R b/R/plot.R
index 566d229afe3..2552c7cc11e 100644
--- a/R/plot.R
+++ b/R/plot.R
@@ -465,16 +465,13 @@ plot.igraph <- function(
       )
 
       if (is.language(label) || !is.na(label)) {
-        lx <- x0 + .3
-        ly <- y0
-        phi <- atan2(ly - center[2], lx - center[1])
-        r <- sqrt((lx - center[1])**2 + (ly - center[2])**2)
-
-        phi <- phi + rad
-
-        lx <- cx + r * cos(phi)
-        ly <- cy + r * sin(phi)
+        # Get midpoint of the Bezier curve for label placement
+        p <- compute.bezier(cp, 50)
+        mid_index <- floor(ncol(p) / 2)
+        lx <- p[1, mid_index]
+        ly <- p[2, mid_index]
 
+        # Override if label position explicitly given
         if (!is.na(lab.x)) {
           lx <- lab.x
         }
diff --git a/tests/testthat/_snaps/plot/basic-graph-layout-1.svg b/tests/testthat/_snaps/plot/basic-graph-layout-1.svg
index d8d1dc241fa..089c3c6e71f 100644
--- a/tests/testthat/_snaps/plot/basic-graph-layout-1.svg
+++ b/tests/testthat/_snaps/plot/basic-graph-layout-1.svg
@@ -25,7 +25,7 @@
   </clipPath>
 </defs>
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+<circle cx='535.45' cy='441.85' r='12.08' style='stroke-width: 0.75; fill: #E69F00;' />
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+<g clip-path='url(#cpMC4wMHw3MjAuMDB8MC4wMHw1NzYuMDA=)'>
+<text x='213.35' y='445.97' text-anchor='middle' style='font-size: 12.00px; fill: #00008B; font-family: sans;' textLength='6.67px' lengthAdjust='spacingAndGlyphs'>1</text>
+<text x='374.40' y='123.94' text-anchor='middle' style='font-size: 12.00px; fill: #00008B; font-family: sans;' textLength='6.67px' lengthAdjust='spacingAndGlyphs'>2</text>
+<text x='535.45' y='445.98' text-anchor='middle' style='font-size: 12.00px; fill: #00008B; font-family: sans;' textLength='6.67px' lengthAdjust='spacingAndGlyphs'>3</text>
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diff --git a/tests/testthat/test-plot.R b/tests/testthat/test-plot.R
index d444050058f..7e50597d6ff 100644
--- a/tests/testthat/test-plot.R
+++ b/tests/testthat/test-plot.R
@@ -105,7 +105,13 @@ test_that("label colors are correct when loops are present", {
   vdiffr::expect_doppelganger(
     "loop graph",
     function() {
-      plot(g, edge.color = cols, edge.label.color = cols, edge.label = cols)
+      plot(
+        g,
+        edge.color = cols,
+        edge.label.color = cols,
+        edge.label = cols,
+        margin = 0.5
+      )
     }
   )
 })
@@ -131,3 +137,24 @@ test_that("Edges stop at outside of rectangle node", {
 
   vdiffr::expect_doppelganger("rectangle-edges", rectangle_edges)
 })
+
+test_that("Multi loops are arranged correctly", {
+  skip_if_not_installed("vdiffr")
+
+  multi_loops_triangle <- function() {
+    g <- make_graph(c(1,2,2,3,3,1,1,1,1,1,1,1,1,1),directed = FALSE)
+    V(g)$x <- c(1,1.5,2)
+    V(g)$y <- c(0,1,0)
+    plot(g, margin = 0.2, loop.size = 2)
+  }
+
+  vdiffr::expect_doppelganger("multi-loops-triangle", multi_loops_triangle)
+
+  multi_loops_many <- function() {
+    withr::local_seed(42)
+    g2 <- make_graph(c(1,2, 2,3, 3,1, 1,4, 4,5, 5,1, 3,4, 5,2, 1,1, 1,1, 1,1, 1,1, 1,1, 1,1, 1,1),directed = FALSE)
+    plot(g2, loop.size = 2)
+  }
+
+  vdiffr::expect_doppelganger("multi-loops-many", multi_loops_many)
+})

From 871cb688d7921726ff8b37d20fe813f1e5532a13 Mon Sep 17 00:00:00 2001
From: schochastics <david@schochastics.net>
Date: Wed, 25 Jun 2025 12:07:26 +0200
Subject: [PATCH 09/18] adjust width of loop based on available space too

---
 R/plot.R                                      | 35 ++++++++++++-------
 .../testthat/_snaps/plot/multi-loops-many.svg | 14 ++++----
 .../_snaps/plot/multi-loops-triangle.svg      |  8 ++---
 3 files changed, 34 insertions(+), 23 deletions(-)

diff --git a/R/plot.R b/R/plot.R
index 2552c7cc11e..31327f02da1 100644
--- a/R/plot.R
+++ b/R/plot.R
@@ -537,22 +537,24 @@ plot.igraph <- function(
     }
 
     # For each loop, assign unique angle within largest gap (flower petal style)
+    # depending on the number of loops and the available angular space
     la_dyn <- numeric(length(loops.v))
+    narrowing <- numeric(length(loops.v))
 
     loop_table <- table(loops.v)
     loop_idx <- ave(seq_along(loops.v), loops.v, FUN = seq_along)
-    loop_count <- loop_table[as.character(loops.v)]
-    narrowing <- pmax(0.3, 1 - (loop_count - 1) * 0.15)
 
     for (v in unique(loops.v)) {
       idx <- which(loops.v == v)
+      n_loops <- length(idx)
 
       incident_edges <- incident(graph, v, mode = "all")
       incident_edges <- incident_edges[!which_loop(graph)[incident_edges]]
 
       if (length(incident_edges) == 0) {
-        # No neighbors, spread loops in full circle
-        loop_angles <- seq(0, 2 * pi, length.out = length(idx) + 1)[-1]
+        # Full circle available if no edges
+        loop_angles <- seq(0, 2 * pi, length.out = n_loops + 1)[-1]
+        gap_span <- 2 * pi
       } else {
         angles <- sapply(incident_edges, function(e) {
           ends_e <- ends(graph, e)
@@ -572,30 +574,39 @@ plot.igraph <- function(
         max_gap_index <- which.max(gaps)
 
         gap_start <- angles[max_gap_index]
-        gap_end <- (gap_start + gaps[max_gap_index]) %% (2 * pi)
+        gap_span <- gaps[max_gap_index]
+        gap_end <- (gap_start + gap_span) %% (2 * pi)
 
-        # Generate equally spaced angles inside the gap
+        # Generate loop angles spaced inside the gap
         if (gap_end > gap_start) {
-          loop_angles <- seq(gap_start, gap_end, length.out = length(idx) + 2)[
-            -c(1, length(idx) + 2)
+          loop_angles <- seq(gap_start, gap_end, length.out = n_loops + 2)[
+            -c(1, n_loops + 2)
           ]
         } else {
-          # wrapped gap
+          # wrap around
           gap_end <- gap_end + 2 * pi
-          loop_angles <- seq(gap_start, gap_end, length.out = length(idx) + 2)[
-            -c(1, length(idx) + 2)
+          loop_angles <- seq(gap_start, gap_end, length.out = n_loops + 2)[
+            -c(1, n_loops + 2)
           ] %%
             (2 * pi)
         }
       }
 
       la_dyn[idx] <- loop_angles
+
+      # Compute narrowing factor based on angular space
+      angle_per_loop <- gap_span / n_loops
+      # Scale narrowing between 1 (wide) and ~0.3 (tight)
+      narrowing_factor <- pmin(1, pmax(0.2, angle_per_loop / (pi / 5))) # full width if ≥36°, compress below
+      print(narrowing_factor)
+      narrowing[idx] <- narrowing_factor
     }
     if (length(la) == 1) {
       la <- rep(la, length(loops.v))
     }
+
     la[is.na(la)] <- la_dyn[is.na(la)]
-    # All loops same size, but different directions like flower petals
+
     adjusted_loop_size <- rep(loop.size, length(loops.v))
 
     xx0 <- layout[loops.v, 1] + cos(la) * vs
diff --git a/tests/testthat/_snaps/plot/multi-loops-many.svg b/tests/testthat/_snaps/plot/multi-loops-many.svg
index a27b581d1b1..4541fe9af50 100644
--- a/tests/testthat/_snaps/plot/multi-loops-many.svg
+++ b/tests/testthat/_snaps/plot/multi-loops-many.svg
@@ -25,13 +25,13 @@
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 </defs>
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From c4c4b273e3848977e2199ce89fcd5e8f56b7b5b2 Mon Sep 17 00:00:00 2001
From: "github-actions[bot]"
 <41898282+github-actions[bot]@users.noreply.github.com>
Date: Wed, 25 Jun 2025 12:17:56 +0200
Subject: [PATCH 10/18] test: Snapshot updates for rcc-smoke (null) (#1885)

Co-authored-by: schochastics <17147355+schochastics@users.noreply.github.com>
---
 .../testthat/_snaps/plot/multi-loops-many.svg | 50 +++++++++----------
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index 4541fe9af50..69344a2cae4 100644
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From 3824f46ab09aa0390a785f79cfe14009f5f34a3e Mon Sep 17 00:00:00 2001
From: schochastics <schochastics@users.noreply.github.com>
Date: Wed, 25 Jun 2025 10:25:06 +0000
Subject: [PATCH 11/18] chore: Auto-update from GitHub Actions

Run: https://github.com/igraph/rigraph/actions/runs/15873713122
---
 man/plot.common.Rd | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/man/plot.common.Rd b/man/plot.common.Rd
index 99c01689b73..3c575cb1f7c 100644
--- a/man/plot.common.Rd
+++ b/man/plot.common.Rd
@@ -364,7 +364,7 @@ This is not very surprising, it is the expected behavior.
 Gives the angle in radians for plotting loop edges.
 See the \code{label.dist} vertex parameter to see how this is interpreted.
 
-The default value is 0.
+The default value is NA. This means that the loop edges will be drawn in the largest gap possible.
 }
 \item{loop.angle2}{
 Gives the second angle in radians for plotting loop edges.

From 6e40e7f8efe1d9f836b7392678043b135e102dfe Mon Sep 17 00:00:00 2001
From: schochastics <david@schochastics.net>
Date: Wed, 25 Jun 2025 12:34:02 +0200
Subject: [PATCH 12/18] make loops end in center of node instead of border

---
 R/plot.R                                      |  6 +--
 .../_snaps/plot/basic-graph-layout-1.svg      |  2 +-
 .../_snaps/plot/basic-graph-layout-2.svg      |  2 +-
 .../_snaps/plot/basic-graph-spheres.svg       | 18 +++----
 tests/testthat/_snaps/plot/loop-graph.svg     |  4 +-
 .../testthat/_snaps/plot/multi-loops-many.svg | 50 +++++++++----------
 .../_snaps/plot/multi-loops-triangle.svg      |  8 +--
 tests/testthat/test-plot.R                    |  2 +-
 8 files changed, 46 insertions(+), 46 deletions(-)

diff --git a/R/plot.R b/R/plot.R
index 31327f02da1..46fb2bb3366 100644
--- a/R/plot.R
+++ b/R/plot.R
@@ -598,7 +598,6 @@ plot.igraph <- function(
       angle_per_loop <- gap_span / n_loops
       # Scale narrowing between 1 (wide) and ~0.3 (tight)
       narrowing_factor <- pmin(1, pmax(0.2, angle_per_loop / (pi / 5))) # full width if ≥36°, compress below
-      print(narrowing_factor)
       narrowing[idx] <- narrowing_factor
     }
     if (length(la) == 1) {
@@ -609,8 +608,9 @@ plot.igraph <- function(
 
     adjusted_loop_size <- rep(loop.size, length(loops.v))
 
-    xx0 <- layout[loops.v, 1] + cos(la) * vs
-    yy0 <- layout[loops.v, 2] + sin(la) * vs
+    r_offset <- 0 # radius offset for loops if needed later
+    xx0 <- layout[loops.v, 1] + cos(la) * r_offset
+    yy0 <- layout[loops.v, 2] + sin(la) * r_offset
 
     mapply(
       loop,
diff --git a/tests/testthat/_snaps/plot/basic-graph-layout-1.svg b/tests/testthat/_snaps/plot/basic-graph-layout-1.svg
index 089c3c6e71f..447b8f3955e 100644
--- a/tests/testthat/_snaps/plot/basic-graph-layout-1.svg
+++ b/tests/testthat/_snaps/plot/basic-graph-layout-1.svg
@@ -25,7 +25,7 @@
   </clipPath>
 </defs>
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diff --git a/tests/testthat/test-plot.R b/tests/testthat/test-plot.R
index 7e50597d6ff..1c35043f50a 100644
--- a/tests/testthat/test-plot.R
+++ b/tests/testthat/test-plot.R
@@ -67,7 +67,7 @@ test_that("basic plot test, spheres", {
   vdiffr::expect_doppelganger(
     "Basic graph, spheres",
     function() {
-      plot(g, vertex.shape = "sphere", vertex.size = 100)
+      plot(g, vertex.shape = "sphere", vertex.size = 40)
     }
   )
 })

From c9a965c915364767c384318c5eed85aade04b242 Mon Sep 17 00:00:00 2001
From: "github-actions[bot]"
 <41898282+github-actions[bot]@users.noreply.github.com>
Date: Wed, 25 Jun 2025 12:40:19 +0200
Subject: [PATCH 13/18] test: Snapshot updates for rcc-smoke (null) (#1886)

Co-authored-by: schochastics <17147355+schochastics@users.noreply.github.com>
---
 .../testthat/_snaps/plot/multi-loops-many.svg | 50 +++++++++----------
 1 file changed, 25 insertions(+), 25 deletions(-)

diff --git a/tests/testthat/_snaps/plot/multi-loops-many.svg b/tests/testthat/_snaps/plot/multi-loops-many.svg
index f6239aaf584..e003ec2dee8 100644
--- a/tests/testthat/_snaps/plot/multi-loops-many.svg
+++ b/tests/testthat/_snaps/plot/multi-loops-many.svg
@@ -25,32 +25,32 @@
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From 778fd06f0a03f8e0043e1061f5003437b1eb5e4d Mon Sep 17 00:00:00 2001
From: schochastics <david@schochastics.net>
Date: Wed, 25 Jun 2025 12:48:59 +0200
Subject: [PATCH 14/18] slightly more narrow loops allowed

---
 R/plot.R                                      |  4 +-
 .../testthat/_snaps/plot/multi-loops-many.svg | 50 +++++++++----------
 2 files changed, 27 insertions(+), 27 deletions(-)

diff --git a/R/plot.R b/R/plot.R
index 46fb2bb3366..b96e51fb88b 100644
--- a/R/plot.R
+++ b/R/plot.R
@@ -596,8 +596,8 @@ plot.igraph <- function(
 
       # Compute narrowing factor based on angular space
       angle_per_loop <- gap_span / n_loops
-      # Scale narrowing between 1 (wide) and ~0.3 (tight)
-      narrowing_factor <- pmin(1, pmax(0.2, angle_per_loop / (pi / 5))) # full width if ≥36°, compress below
+      # Scale narrowing between 1 (wide) and ~0.2 (tight)
+      narrowing_factor <- pmin(1, pmax(0.2, angle_per_loop / (pi / 4))) # full width if ≥45°, compress below
       narrowing[idx] <- narrowing_factor
     }
     if (length(la) == 1) {
diff --git a/tests/testthat/_snaps/plot/multi-loops-many.svg b/tests/testthat/_snaps/plot/multi-loops-many.svg
index e003ec2dee8..8f564791995 100644
--- a/tests/testthat/_snaps/plot/multi-loops-many.svg
+++ b/tests/testthat/_snaps/plot/multi-loops-many.svg
@@ -25,32 +25,32 @@
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From 770f32f8f586bd5592d2855c9a7a13ad4413fd72 Mon Sep 17 00:00:00 2001
From: "github-actions[bot]"
 <41898282+github-actions[bot]@users.noreply.github.com>
Date: Wed, 25 Jun 2025 13:06:49 +0200
Subject: [PATCH 15/18] test: Snapshot updates for rcc-smoke (null) (#1887)

Co-authored-by: schochastics <17147355+schochastics@users.noreply.github.com>
---
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diff --git a/tests/testthat/_snaps/plot/multi-loops-many.svg b/tests/testthat/_snaps/plot/multi-loops-many.svg
index 8f564791995..4f554c09d97 100644
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From 25afb4d1949c6772ca4b74fcadcad85f59b13f04 Mon Sep 17 00:00:00 2001
From: schochastics <david@schochastics.net>
Date: Wed, 25 Jun 2025 13:10:56 +0200
Subject: [PATCH 16/18] fixed layout for test graph

---
 .../testthat/_snaps/plot/multi-loops-many.svg | 50 +++++++++----------
 tests/testthat/test-plot.R                    |  3 +-
 2 files changed, 27 insertions(+), 26 deletions(-)

diff --git a/tests/testthat/_snaps/plot/multi-loops-many.svg b/tests/testthat/_snaps/plot/multi-loops-many.svg
index 4f554c09d97..c99ed95be4b 100644
--- a/tests/testthat/_snaps/plot/multi-loops-many.svg
+++ b/tests/testthat/_snaps/plot/multi-loops-many.svg
@@ -25,32 +25,32 @@
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diff --git a/tests/testthat/test-plot.R b/tests/testthat/test-plot.R
index 1c35043f50a..bca9bdb7d74 100644
--- a/tests/testthat/test-plot.R
+++ b/tests/testthat/test-plot.R
@@ -151,8 +151,9 @@ test_that("Multi loops are arranged correctly", {
   vdiffr::expect_doppelganger("multi-loops-triangle", multi_loops_triangle)
 
   multi_loops_many <- function() {
-    withr::local_seed(42)
     g2 <- make_graph(c(1,2, 2,3, 3,1, 1,4, 4,5, 5,1, 3,4, 5,2, 1,1, 1,1, 1,1, 1,1, 1,1, 1,1, 1,1),directed = FALSE)
+    V(g2)$x <- c(1,2,2,0,0)
+    V(g2)$y <- c(1,0,2,2,0)
     plot(g2, loop.size = 2)
   }
 

From 903069bd413c1971ab271ad43e109605b931bda8 Mon Sep 17 00:00:00 2001
From: schochastics <david@schochastics.net>
Date: Wed, 25 Jun 2025 16:04:46 +0200
Subject: [PATCH 17/18] dont use names

---
 R/plot.R | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/R/plot.R b/R/plot.R
index b96e51fb88b..e6095c27ccc 100644
--- a/R/plot.R
+++ b/R/plot.R
@@ -557,7 +557,7 @@ plot.igraph <- function(
         gap_span <- 2 * pi
       } else {
         angles <- sapply(incident_edges, function(e) {
-          ends_e <- ends(graph, e)
+          ends_e <- ends(graph, e, names = FALSE)
           other <- if (as.numeric(ends_e[1]) == v) {
             as.numeric(ends_e[2])
           } else {

From 9436497783512d78691f8d6bddb1eaff348b40ee Mon Sep 17 00:00:00 2001
From: schochastics <david@schochastics.net>
Date: Thu, 3 Jul 2025 12:14:15 +0200
Subject: [PATCH 18/18] changed NA to NULL

---
 R/plot.R           | 6 +++---
 R/plot.common.R    | 4 ++--
 man/plot.common.Rd | 2 +-
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/R/plot.R b/R/plot.R
index 24f2c13ee8d..518c17c581a 100644
--- a/R/plot.R
+++ b/R/plot.R
@@ -610,15 +610,15 @@ plot.igraph <- function(
       narrowing_factor <- pmin(1, pmax(0.2, angle_per_loop / (pi / 4))) # full width if ≥45°, compress below
       narrowing[idx] <- narrowing_factor
     }
-    if (length(la) == 1) {
-      la <- rep(la, length(loops.v))
+    if (is.null(la)) {
+      la <- rep(NA, length(loops.v))
     }
 
     la[is.na(la)] <- la_dyn[is.na(la)]
 
     adjusted_loop_size <- rep(loop.size, length(loops.v))
 
-    r_offset <- 0 # radius offset for loops if needed later
+    r_offset <- 0
     xx0 <- layout[loops.v, 1] + cos(la) * r_offset
     yy0 <- layout[loops.v, 2] + sin(la) * r_offset
 
diff --git a/R/plot.common.R b/R/plot.common.R
index baa97238a7f..72b07c6d1e6 100644
--- a/R/plot.common.R
+++ b/R/plot.common.R
@@ -348,7 +348,7 @@
 #'   Gives the angle in radians for plotting loop edges.
 #'   See the `label.dist` vertex parameter to see how this is interpreted.
 #'
-#'   The default value is NA. This means that the loop edges will be drawn in the largest gap possible.
+#'   The default value is NULL. This means that the loop edges will be drawn automatically in the largest gap possible.
 #' }
 #' \item{loop.angle2}{
 #'   Gives the second angle in radians for plotting loop edges.
@@ -4881,7 +4881,7 @@ i.edge.default <- list(
   label = i.get.edge.labels,
   lty = 1,
   width = 1,
-  loop.angle = NA,
+  loop.angle = NULL,
   loop.angle2 = 0,
   label.family = "serif",
   label.font = 1,
diff --git a/man/plot.common.Rd b/man/plot.common.Rd
index a24e5018a00..09b4ddb6cee 100644
--- a/man/plot.common.Rd
+++ b/man/plot.common.Rd
@@ -356,7 +356,7 @@ This is not very surprising, it is the expected behavior.
 Gives the angle in radians for plotting loop edges.
 See the \code{label.dist} vertex parameter to see how this is interpreted.
 
-The default value is NA. This means that the loop edges will be drawn in the largest gap possible.
+The default value is NULL. This means that the loop edges will be drawn automatically in the largest gap possible.
 }
 \item{loop.angle2}{
 Gives the second angle in radians for plotting loop edges.