How to refer to different parts of the API while scripting - Help

I apologize for the imprecise nature of this question, but I can’t deny that I don’t understand the PlayCanvas API in any meaningful way. I can look up functions, commands, etc in the API with ease, but I don’t know how to apply this information practically. As an example, in my ETA project, I want tiles to turn a different color and for their position to be saved to a variable if the ruler button has been selected. However,the ruler button doesn’t seem to have any appreciable effect on tile se

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