🚀 go-pugleaf

Hi,

I have a bit of a problem in drawing some components on to a Canvas.

I am writing a genetic map viewer that parses and processes a lot of
information- to simplify it, it draw lots of lines, strings and boxes on
screen in different colours. You are able to streach out the map out so
that it is theoretically very long. The problem is that if I paint all
these to screen I get a huge image that does not scroll in the
ScrollPane very well and crashes the program!

I tried setting the clip area in Graphics thinking that anything outside
of this area simply would not get drawn on the bitmap but alas, it still
makes the huge bitmap and only shows the bit you specified in the clip
area! Is this not a short-coming of the Graphics class?

Anyway, what I'm looking for is the simplest and most efficient way of
rendering this image so that all that is drawn in a call of the paint
method is what you can see on the screen. It gets really complicated
when you have lines that go off the viewable area as you have to start
applying the equation of a line and all that! What I'd like is a
solution similar to the way I thought the clip area setting worked!

Many thanks,

Jeremy Dickson.