How much of the board does the tree cover, and which setting controls that most? Branch color shifts with level, from the brown trunk to green at the outermost twigs.
Try this Set length-decay to 85 and press Reset. Branches now shrink more slowly, and the tree takes 64 ticks instead of 46 and paints 654 patches instead of 306. At 50 the segments fall below one patch after three forks, and the tree paints only 50 patches.
About this model Where it ends up
A recursive branching tree, the standard Logo exercise, in the family of the NetLogo Models Library's Tree Simple. Walk a segment, then fork into two shorter copies turned left and right. The branch angle and the length ratio between generations set the shape, and each branch repeats the whole at a smaller scale, down to the size of one patch.
One walker starts at the bottom center heading up, with a segment of trunk-length patches, and paints each patch it steps on with its branch level. When its segment is used up it hatches two walkers turned by −branch-angle and +branch-angle, with segments length-decay percent as long, and dies; the children spend one tick moving to the fork before they walk. No children are made past depth levels or once a segment would be shorter than one patch, so at the defaults a depth above 7 changes nothing. trunk-length and depth take effect on Reset; branch-angle and length-decay are read at each fork, so a mid-run change affects only branches still to grow. The run stops when the last walker dies.
