Greenfoot

2021/6/10

#

Hello!, so i have made a brick breaker game that i saw on YouTube and I want when i click play before the ball starts moving, to have an image(of a character) appear and next to it a text that will disappear after a few seconds. Can anyone please help me? i currently have made in a separate world to test it this:

import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)

/**
 * Write a description of class cannot here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class cannot extends Actor
{
    /**
     * Act - do whatever the cannot wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    
    public void act() 
{
    setImage(new GreenfootImage("You cannot defeat me...!", 30, Color.WHITE, new Color(0,0,0,0)));
    Greenfoot.playSound("cannot.mp3");
    Greenfoot.delay(100);
    Greenfoot.stop();
    
}
       
}

and it just put the image and the text there and then they just stay there.

danpost

2021/6/10

#

Change line 16 to;

protected void addedToWorld(World world)

and then line 21 to:

world.removeObject(this);

BoondockSaint

2021/6/10

#

thank you! but now they don't appear, should i add a sentence with coordinates?

danpost

2021/6/10

#

BoondockSaint wrote...

thank you! but now they don't appear, should i add a sentence with coordinates?

What does not disappear? Shoe revised code.

BoondockSaint

2021/6/10

#

i mean that now i have the opposite problem. whereas before the image and the text wouldn't disappear after a while now they don't show up at all. the code is that now. that's the code for the text:

import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)

/**
 * Write a description of class cannot here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class cannot extends Actor
{
    /**
     * Act - do whatever the cannot wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    
    public void addedToWorld(World world) 
{
    setImage(new GreenfootImage("You cannot defeat me...!", 30, Color.WHITE, new Color(0,0,0,0)));
    Greenfoot.playSound("cannot.mp3");
    Greenfoot.delay(100);
    world.removeObject(this);
    
}
       
}

that's the code for the image(the robot):

import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)

/**
 * Write a description of class robot here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class robot extends Actor
{
    /**
     * Act - do whatever the robot wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void addedToWorld(World world)
    {
        GreenfootImage image = getImage();
        image.scale(image.getWidth() -320, image.getHeight() -320);
        setImage(image);
        world.removeObject(this);
    }
    public void act() 
    {
        // Add your action code here.
    }    
}

and lastly that's the code of the world:

import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)

/**
 * Write a description of class MyWorld here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class MyWorld extends World
{

    /**
     * Constructor for objects of class MyWorld.
     * 
     */
    public MyWorld()
    {    
        // Create a new world with 600x400 cells with a cell size of 1x1 pixels.
        super(900, 600, 1); 
        prepare();
    }
    
    public void prepare()
    {
        getBackground().setColor(Color.BLACK);
        getBackground().fill();
        
        robot robot = new robot();
        addObject(robot,549,201);
        robot.setLocation(236,316);
        robot.setLocation(172,340);
        
        cannot cannot = new cannot();
        addObject(cannot,390,302);
    }
}

danpost

2021/6/10

#

BoondockSaint wrote...

i mean that now i have the opposite problem. whereas before the image and the text wouldn't disappear after a while now they don't show up at all. the code is that now.

Remove line 20 from robot class. Place at line 22 in cannot class the following line:

world.removeObjects(world.getObjects(robot.class));

BoondockSaint

2021/6/14

#

still nothing just the black background. here some screenshots. my laptop cant screen record for some reason

Gabe1098

2021/6/15

#

you can make a text like this

showImage(new GreenfootImage("Text", 24, Color.BLACK, Color.WHITE));

danpost

2021/6/16

#

BoondockSaint wrote...

still nothing just the black background.

I think the problem was that you were trying to use delay before the scenario starts running. Try this in your world:

public void started()
{
    if (getObjects(cannot.class).size() !- 0)
    {
        Greenfoot.playSound("cannot.mp3");
        Greenfoot.delay(120);
    }
}

Then move the removal lines to the act methods in robot and cannot.

BoondockSaint

2021/7/1

#

it gives me an error at the ! symbol saying "not a statement" and after the ) "needs an ;" also by removal lines you mean the "remove.object"?

BoondockSaint

2021/7/1

#

Gabe1098 wrote...

you can make a text like this

showImage(new GreenfootImage("Text", 24, Color.BLACK, Color.WHITE));

Also thank you. I will try that as well if i still have problems with what I'm doing horribly right know.

danpost

2021/7/1

#

BoondockSaint wrote...

it gives me an error at the ! symbol saying "not a statement" and after the ) "needs an ;"

Yeah, I miss-typed a "-" where a "=" should be on line 3.

by removal lines you mean the "remove.object"?

Correct -- using "getWorld()" instead of "world". As far as the line provided by Gabe1098, there is no known method called showImage.

BoondockSaint

2021/7/3

#

I am a little confused about the removal lines. What exactly should i write?

danpost

2021/7/3

#

BoondockSaint wrote...

I am a little confused about the removal lines. What exactly should i write?

This should work for robot class:

import greenfoot.*;

public class robot extends Actor
{
    public robot()
    {
        GreenfootImage image = getImage();
        image.scale(image.getWidth() -320, image.getHeight() -320);
        setImage(image);
    }
    
    public void act() 
    {
        getWorld().removeObject(this);
    }    
}

Use something similar for cannot class.

Gabe1098

2021/7/3

#

BoondockSaint wrote...

Gabe1098 wrote...

you can make a text like this

showImage(new GreenfootImage("Text", 24, Color.BLACK, Color.WHITE));

Also thank you. I will try that as well if i still have problems with what I'm doing horribly right know.

oops I'm sorry I should have put setImage instead of showImage

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Adding text and image and then make it disappear.