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How to check the colour of a pixel in an image, then change it?

By K_wow, with 2 replies.
Last reply by K_wow, about 13 years ago:

davmac wrote...

Line 14 uses reference equality (the == operator) to compare the oldColour object with the colour object returned by getColorAt(). Even if the two objects specify the same colour, there's no guarantee that they'll be the same object. You should use .equals(...) for this check rather than the == operator. if (image.getColorAt(currentPixel, y).equals(oldColour)) ...

Thankyou, it works perfectly!

PDF format Book For GREENfoot

By doughauf, with 2 replies.
Last reply by dangjavageek, about 13 years ago:

Safari Books Online appears to carry the Greenfoot Book (http://greenfoot.org/book) and if you have a public library account, some libraries appear to have a relationship with Safari Books Online so that you can use that as a way to read / reference the book as needed. There's also an option to buy the e-book.

Can we display timer in a game?

By Kaiwalya, with 15 replies.
Last reply by danpost, about 13 years ago:

I came up with the following for the CountDown class:

Greenfoot character moves through walls only horizontally?

By brandondamante, with 1 reply.
Replied to by danpost, about 13 years ago:

If you save in a local field (or fields) the original direction of movement, then check for intersecting object, then when intersection found, move back in the opposite direction to move back off the object. Also, using this way you do not needs all those checks.

special attack types

By darkmist002, with 4 replies.
Last reply by darkmist002, about 13 years ago:

thanks, was hesitant about using loops b/c of what i had read. glad i asked you guys about it, otherwise i won't have even tried loops.

getting hp to scale with waves

By darkmist002, with 11 replies.
Last reply by darkmist002, about 13 years ago:

that works, thanks. can't believe i didn't think of something that simple. guess i got so caught up by using modulus division i forgot about regular lol.

8bitorangejuice

Changing colour of a fillRect(x1,y1,x2,y2)

By 8bitorangejuice, with 8 replies.
Last reply by 8bitorangejuice, about 13 years ago:

Oh and as for the question: I am using a static int :)

main menu + keeping the score. help!

By Icecold, with 7 replies.
Last reply by Skylander85, about 13 years ago:

i need help uploading my scenario

By JayWood860, with 15 replies.
Last reply by davmac, about 13 years ago:

How did you fix it? If others have the same problem it will be useful for them to know.

How to erase previous drawn images?

By AceticAcid, with 5 replies.
Last reply by Zamoht, about 13 years ago:

Oh I didn't get that the whole thing was made in one GreenfootImage.

Methods with optional values?

By Entity1037, with 3 replies.
Last reply by Zamoht, about 13 years ago:

Sorry for my late answer. I guess you already found out but yes it is possible and it will work.

FlyingRabidUnicornPig

CHALLENGE 3 | June 2013

By FlyingRabidUnicornPig, with 59 replies.
Last reply by steved, about 13 years ago:

Getting one object of certain class via coordinates

By Segara, with 3 replies.
Last reply by danpost, about 13 years ago:

Segara wrote...

Well, as you saw in the code, I do create objects of A class, but don't save them anywhere.

I matters not whether you have saved them or not, or even whether you create and add them to the world or not. If the method does not find any objects of the given class whose image overlaps the location given, then the method will return null. It is the location that is important. If you place a Back object at location (8, 8), then using getX() (or getY()) in the back class will return 8 for that Back object. If you use 'getOneObjectAtOffset(4, 4, null)' for that Back objec

.JAR file in Java

By doughauf, with 3 replies.
Last reply by davmac, about 13 years ago:

If you install Greenfoot you will find various jar files in the installation. At least the main one, greenfoot.jar, will be necessary for building scenarios externally. You will not easily be able to run your scenarios from outside Greenfoot. That's about as much information as I can give you, as building scenarios outside of Greenfoot isn't something we really support. Someone else may be able to offer help.

How to upload a scenario??

By Kaiwalya, with 2 replies.
Last reply by danpost, about 13 years ago:

The 'Share' button near the top-right corner of the Greenfoot application frame initiates a dialog where the 'Publish' tab (at the top) is used to upload your scenario on the Greenfoot site. Just fill in the information, check the appropriate boxes and click on the 'Share' button.

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