1. click any point as the starting point.
2. click on the point connected to the starting point and connect the two points even once.
3. continue to use the current click point as a starting point to connect to the next point.
4. until all the lines are passed, even if they pass through
5. each line can only pass once.
2. click on the point connected to the starting point and connect the two points even once.
3. continue to use the current click point as a starting point to connect to the next point.
4. until all the lines are passed, even if they pass through
5. each line can only pass once.
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