ggtb(): size_zoomin and size_basis Parameters for Geometry Scaling

size_zoomin parameter

The size_zoomin parameter accepts an integer value:

• 0 — zoom in disabled (default)
• -1 — unlimited zoom in
• Any other positive number — maximum zoom-in limit. For example, 2 means the geometry can be scaled up to 2×.

size_basis parameter

The size_basis parameter accepts a string value: x, y, min, or max (default: max). It defines which axis is used to calculate the scaling factor.

• x and y specify the corresponding axis.
• min uses the smaller scaling factor.
• max uses the larger scaling factor.

from lets_plot import *
import pandas as pd
LetsPlot.setup_html()

Enable 'Unlimited' Zoom

ggplot() + geom_point(x=0, y=0, size=10) + ggtb(
    size_zoomin=-1                             # <-- Point size can grow without limits.
)

Limit Maximum Zoom to 3× Original Size

mpg = pd.read_csv('https://raw.githubusercontent.com/JetBrains/lets-plot-docs/master/data/mpg2.csv')

p = (
  ggplot(mpg, 
         aes('engine horsepower', 'miles per gallon', 
             color=as_discrete('origin of car',order=-1)))  
  + theme_grey() + ggtitle('Efficiency vs Engine Horsepower')
)

p + geom_jitter(seed=42) + ggtb(
    size_zoomin=3                 # <-- Point size can grow to 3x of the original size max.
)