SVG and Canvas example of nodes with zoom and add new nodes features static.laszlokorte.de/graph/
also check Laszlo implementation of Bret Victor's talk "Drawing Dynamic Visualizations" github.com/laszlokorte/reform-swift
interactive math expressions visualizer thetamath.com/
implementation of your mockup codepen.io/xgundam05/pen/KjqJn
another implementation that looks good github.com/sketchpunk/NEditorJS
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SVG and Canvas example of nodes with zoom and add new nodes features
static.laszlokorte.de/graph/
also check Laszlo implementation of Bret Victor's talk "Drawing Dynamic Visualizations"
github.com/laszlokorte/reform-swift
interactive math expressions visualizer
thetamath.com/
implementation of your mockup
codepen.io/xgundam05/pen/KjqJn
another implementation that looks good
github.com/sketchpunk/NEditorJS