🚀 go-pugleaf

I've solved this problem now thanks!
Jeremy

Jeremy Dickson wrote:

> 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.
>