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Turtle graphics bug: move(), turn() overrides

By sandtreader, with 5 replies.
Last reply by sandtreader, over 13 years ago:

I think move(double) is possibly good if you're doing precision work; I just provided move(int) and turn(int) in Turtle as 'nccb' suggested. Fixed version with some pretty fractal trees & snowflakes at Fractal turtles scenario I must say this is a very fun environment to play in for someone who is used to emacs & make! Kind regards Paul

How to create a persistent global object reference?

By ez4u2c, with 5 replies.
Last reply by davmac, over 13 years ago:

The signature for your addedToWorld method is wrong. You have: <Code Omitted> Whereas it should be: <Code Omitted> (I missed the typecast earlier - it is necessary of course because you are assigning a World expression to a WombatWorld variable). Because the method is not defined correctly, it doesn't override the method from the Actor class.

Internal factors at the Greenfoot site

By colorfulteen, with 18 replies.
Last reply by danpost, over 13 years ago:

davmac, your post has been recieved -- thank you.

new greenfoot broke scenario?

By ImFerocious, with 8 replies.
Last reply by jbrucker, over 13 years ago:

Greenfoot 2.1.2 does fix the problem. Thanks. I liked the old installer for windows better, though. the msi forced me to uninstall greenfoot 2.1.0 before installing 2.1.2. The old greenfoot and bluej installer would cleanly overwrite a previous version in same install dir.

Run Greenfoot with -ea

By Evmorov, with 1 reply.
Replied to by davmac, over 13 years ago:

You can edit the greenfoot.defs file (part of the Greenfoot installation) and change the "bluej.vm.args" property (add "-ea" at the end).

GreenfootSound should pause when pause the scenario?

By bourne, with 2 replies.
Last reply by bourne, over 13 years ago:

That makes sense. And okay cool! Thanks again

Paint Order - Order of detection bug

By bourne, with 8 replies.
Last reply by bourne, over 13 years ago:

Okay thanks davmac =)

Failing at scoring

By rvevea, with 5 replies.
Last reply by danpost, over 13 years ago:

Struggling with objects - (typecasting?)

By ez4u2c, with 9 replies.
Last reply by davmac, over 13 years ago:

An example of futile typecasting as a descendant class (extensions are lost):

Ok, you're correct that in this case the cast is pointless. (It is still not completely meaningless - the cast will be checked at runtime, and an exception will be thrown getWorld() returns something that is not a Space; but this usage is uncommon).

And an example of the default (no typecast) returning the ancestor (World),:

The "getWorld()" method call results in an expression of type World, because that is what it is declared to return. This particular example you have given w

"checkKeypress" Help!

By Stekpannadeath, with 4 replies.
Last reply by kiarocks, over 13 years ago:

your welcome, the semi colons at the end of if statements signal the end of the statement, and the other code is run without any keys pressed.

Sound intensity

By K_O_P, with 2 replies.
Last reply by K_O_P, over 13 years ago:

Thank you very much! I'll try it! :)

If Statement Multiple Conditions

By LastingLuck, with 5 replies.
Last reply by LastingLuck, over 13 years ago:

I changed it to what you said, and it worked perfectly. I'm still very new to programming so thanks a lot for the help.

Changing a Background

By rvevea, with 2 replies.
Last reply by rvevea, over 13 years ago:

Extremely helpful! Thank you! just for reference: Created a global boolean <Code Omitted> then had the if statements check the boolean value like so: <Code Omitted>

OMG what's wrong with Greenfoot this time :(

By Herman, with 6 replies.
Last reply by davmac, over 13 years ago:

Follow the link to the other discussion (in my previous post) - it has a link to instructions on how to clear the cache.

Tile positions.

By actinium, with 2 replies.
Last reply by actinium, over 13 years ago:

Thanks for your reply. I know that the coordinates are 0,0 top left. Wait a minute, if i addObject at 0,0 its actually the centre of the image, while a tile at 0,0 is at the top left. Lol, i need an offset of 12.5 for x and y coords in addObject, got it thanks.

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