Refer white dot objects as reference angle with action 'set angle towards position'. You will likely pick dot object ahead purple box each time the box reach a dot on it's way. As the consequence at least "counter" variable required.
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i can't understand counter variable where to set
It needs proper picking condition based on dot UID or IID. If you trying to create drawing route, there is already tutorial for that. Please check following page:
construct.net/en/tutorials/writing-game-959