2dtree (graphviz + gnuplot)

2dtree.dot

digraph {
  node [ shape = record, height=.1];
  node0[label = "<f0> lower |<f1> pt: [0.5 0.5] |<f2> higher"];
  node1[label = "<f0> lower |<f1> pt: [0.6 0.3] |<f2> higher"];
  node2[label = "<f0> lower |<f1> pt: [0.7 0.8] |<f2> higher"];
  node3[label = "<f0> lower |<f1> pt: [0.4 0.8] |<f2> higher"];
  node4[label = "<f0> lower |<f1> pt: [0.4 0.6] |<f2> higher"];

  "node0":f2 -> "node1":f1;
  node1:f2 -> node2:f1;
  node0:f0 -> node3:f1;
  node3:f0 -> node4:f1;

}

2dtree.gp

reset
unset key;
set title "2d Tree Visualization";
set label '[0.5 0.5]' at 0.5,0.5 left offset char 1,1;
set label '[0.6 0.3]' at 0.6,0.3 left offset char 1,-1;
set label '[0.7 0.8]' at 0.7,0.8 left offset char 1;
set label '[0.4 0.8]' at 0.4,0.8 left offset char -1,1;
set label '[0.4 0.6]' at 0.4,0.6 right offset char -0.5,1;

set xrange [0:1];
set yrange [0:1];

set style line 1 lc rgb 'black' pt 7;
plot '-' with points ls 1, \
     '-' with lines ls 1
# Points data
0.5 0.5
0.6 0.3
0.7 0.8
0.4 0.8
0.4 0.6
e
# Lines data
0.5 0.0
0.5 1

0.5 0.3
1 0.3

0.7 0.3
0.7 1

0.0 0.8
0.5 0.8

0.4 0
0.4 0.8
e

See pictures here: https://fredrikmeyer.net/2024/04/02/2d-tree.html