how get the distance between two points

[LucaSirri]

hello,

I have a problem...

I get a point by muose click, and I need to know if this point is near a chart point (dataset point), see the image :



I have a point and a dataset, there is a way to know the dataset point nearest ?

[david.gilbert]

Only by iterating through all the data items in the dataset and computing the "distance" for each one. And distance could be defined in Java2D space OR in data-space (if the axis scales are different, which is the normal case).