Discussions

Please refer to the GreenfootImage API documentation for the methods available for image editing.

The way azazeel gave will work. It is always best to check these type values (scores, lives, health, etc) immediately after their values are changed. If not done immediately, the comparison may remain true for multiple act cycles and you will be doing the action required unnecessarily multiple times. If doing things like working with images or adding new actors into the world, you could end up with your project lagging, or even worse, crashing.

thanks danpost, its very help my project.

YES! That's it! Thank you soo much for the help, and sorry for taking up so much of your time!

Remove the division sign, "/", in the middle of line 6 of the 'atWorldEdge' method (in the 'return' statement).

What yedefei said about the statement not working is true. There is another point to consider about the statement, however. If the object was not yet in the world, then 'w', which is assigned the value returned by 'getWorld' will be 'null'. It is rare, and should be avoided, to have an actor add itself into a world. For one thing, it would need to know what world object to add itself into. For another, it would need to know where in that world to add itself. These parameters should come from outside sources -- like the world, or an actor in that world.

for example ，if you want to press “up” key to trigger moving 10 steps ，you can write ： <Code Omitted>

Since you used an nominated objects "new Wrong1()" when adding object ，the compiler couldn't find the reference of the object of Wrong1 ，so Line 10 “getWorld().removeObject(Wrong1);” can't work 。You may adjust the code like this： <Code Omitted>or you could just change the code in Line 8 to： <Code Omitted>One more thing ， you‘d better not to define the same identifier of object as the class。

Greenfoot.setWorld(new Circuit1()); if your class name is Circuit1

ups, in Asteroid in act() should "setLocation(getX(), getY()+m);"

Oh okay. Thanks to both of you for the help. It works well now.

Is it you want the enemies to shoot at you when they 'see' you? Do you have any code for enemies at the moment.

Please answer the questions I provided above. I am not familiar with android games.

<Code Omitted> Like this? Every positive even number except 2 is dividable into two parts of even numbers. (2 isn't possible, because 1 and 1 is the only solution, assuming 0 isn't a positive weight.)