Drawing in a canvas

[Jimmanuel]

In my limited time as a Java developer (the last 15 minutes) it sounds like extending the Canvas class in order to draw things on it is it's intended usage. If the IDE has defined a new class for you that extends from it then shouldn't it be as simple as overriding it's paint method?

:Badger:

[fly904]

What I normally do is to override the default paint method in the Canvas class. Have a look at this[^]. The SweepCanvas class is the basic principle, just remove the threading obviously.

My failometer is detecting vast quantities of FAIL! "Its SQL - hardly programming..." (Caslen)

[rareseu]

[quote]If the IDE has defined a new class for you that extends from it then shouldn't it be as simple as overriding it's paint method? [/quote] the IDE creates an instance of the class Canvas, the class that extends Canvas part was in the sun example

[Jimmanuel]

I found in Netbeans in the "Inspector" you can select a GUI element, right click on it and go to "Customize Code". That allows you to change the variable from a standard Canvas to your custom type that extends from Canvas that does the drawing.

[rareseu]

That's an awesome tip Jimmanuel thanks :)

[rareseu]

[quote]What I normally do is to override the default paint method in the Canvas class. Have a look at this[^]. The SweepCanvas class is the basic principle, just remove the threading obviously. [/quote] good tip :) thank you, what i don't understand is where the run method gets invoked ( and as a consequence the repaint method), If anyone could explain this i think i could get the hang of how this class works. I see that the trick to making this work is calling the paint method using repaint() which saves you from making a Graphics instance( not the most obvious solution but i cant afford to be picky right now).

[fly904]

I'm not great at explaining things, but have a look at this[^] and this[^].

My failometer is detecting vast quantities of FAIL! "Its SQL - hardly programming..." (Caslen)

[rareseu]

Aaah i see now , but if i don't implement the class with threading(which i'm trying to avoid just because it would add more complexity ), what would be a good mechanism to call the repaint method ? btw thanks for your patience, and sorry for all the noobie questions but my deadline is closing in fast and i haven't even gone into the difficult part of the project

[fly904]

If you don't want to use threading then simple use canasVariableName.repaint();. I think that's what you mean but I'm not sure. If you do want to use threading then this method is the simplest way.

My failometer is detecting vast quantities of FAIL! "Its SQL - hardly programming..." (Caslen)

[rareseu]

Thank you soo much, you're a life saver :D