can anyone post different varietals on how i could remove an object after adding it to the world?
Hiimachicken wrote ...
2013/12/16
how do i remove an object
thanks for anyone that can help
The only way is to use the World class method 'removeObject(Actor)' or 'removeObjects(Class)'. The latter will remove all objects of the class given in the parameter; the first will remove that specific object given in the parameter.
i have a code so when i hit an object it adds an object in the world how would i remove that when i go and hit another block somewhere else in the world?
You would need a field in the class of the actor that is hitting the block to hold the last object added. If the field does not contain an object (is 'null'), set it to the object added to the world. If the field contains an object, remove that object and set the field back to 'null'.
Where it says "]]] " thats where i want the remove code?
can you edit the code so that it deletes the wall and re-post it back here?
Thank you so much danpost for the help
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 | import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)public class Yellowplayer2 extends Char{ private int fallSpeed = 0; private int acceleration = 1; boolean isJumping=false; public void act() { move(); //manage the motion horizontally drop(); //manage the motion vertically start();}private void start(){ Actor first = getOneObjectAtOffset(0,0,End.class); if(first!=null) { Second h = new Second(); Greenfoot.setWorld(h);}Actor change = getOneObjectAtOffset(0,0,Change.class); if(change!=null) { Wall wall = new Wall(); getWorld().addObject(wall,29,215); getWorld().addObject(new Wallup(),61,240); getWorld().addObject(new Wallup(),301,242); getWorld().addObject(new Wall(),490,333); getWorld().addObject(new Change2(),484,309); }Actor Firstc = getOneObjectAtOffset(0,0,Firstc.class); if(Firstc!=null) { }Actor change2 = getOneObjectAtOffset(0,0,Change2.class); if(change2!=null) { [[[[[[HELPHERE]]]]] }Actor exit = getOneObjectAtOffset(0,0,Exit1.class); if(exit!=null) { // setImage("smallblock.png");// Third a = new Third();// Greenfoot.setWorld(a); }} public void drop(){ if(isJumping==true) jump(); else if(onGround()==false) { fall(); } else standOn(); } public boolean onGround(){ Object t1=(Object)getOneObjectAtOffset(-getImage().getWidth()/2+5, getImage().getHeight()/2 , Object.class); Object t2=(Object)getOneObjectAtOffset(getImage().getWidth()/2-5, getImage().getHeight()/2 , Object.class); if(t1!=null||t2!=null) return true; else return false; } public void standOn(){ Object t1=(Object)getOneObjectAtOffset(-getImage().getWidth()/2+5, getImage().getHeight()/2 , Object.class); Object t2=(Object)getOneObjectAtOffset(getImage().getWidth()/2-5, getImage().getHeight()/2 , Object.class); if(t1!=null) setLocation ( getX(), t1.getY()-t1.getImage().getHeight()/2-getImage().getHeight()/2+2); else if(t2!=null) setLocation ( getX(), t2.getY()-t2.getImage().getHeight()/2-getImage().getHeight()/2+2); fallSpeed=0; if (Greenfoot.isKeyDown("up")){ fallSpeed = -12; isJumping=true; } } public void fall(){ setLocation(getX(),getY() + fallSpeed); fallSpeed = fallSpeed + acceleration; } public void jump(){ setLocation(getX(),getY() + fallSpeed); fallSpeed = fallSpeed + acceleration; if(fallSpeed>=0) isJumping=false; Object t1=(Object)getOneObjectAtOffset(-getImage().getWidth()/2+5 ,-getImage().getHeight()/2, Object.class); Object t2=(Object)getOneObjectAtOffset(getImage().getWidth()/2-5 ,-getImage().getHeight()/2, Object.class); if (t1!=null) { setLocation ( getX(), t1.getY() + t1.getImage().getHeight()/2+getImage().getHeight()/2+1); fallSpeed=0; } else if(t2!=null){ setLocation ( getX(), t2.getY() + t2.getImage().getHeight()/2+getImage().getHeight()/2+1); fallSpeed=0; } } public void move(){ if (Greenfoot.isKeyDown("left")){ setLocation(getX()-7, getY()); } Object t=(Object)getOneObjectAtOffset(-getImage().getWidth()/2 ,0, Object.class); if (t!=null) setLocation ( t.getX()+t.getImage().getWidth()/2+getImage().getWidth()/2, getY() ); if (Greenfoot.isKeyDown("right")){ setLocation(getX()+7, getY()); } t=(Object)getOneObjectAtOffset(getImage().getWidth()/2 ,0, Object.class); if (t!=null) setLocation ( t.getX()-t.getImage().getWidth()/2-getImage().getWidth()/2, getY() ); } } |
Do you want all the objects that are added when the Change object is encountered to be removed when a Change2 object is encountered?
or a specific one or more?
1 2 3 4 5 6 | Wall wall = new Wall(); getWorld().addObject(wall,29,215); getWorld().addObject(new Wallup(),61,240); getWorld().addObject(new Wallup(),301,242); getWorld().addObject(new Wall(),490,333); getWorld().addObject(new Change2(),484,309); |
Just the one object please
?
Which one? One of the Wall objects, one of the Wallup objects, or the Change2 object?
Not the chnage2 because i want the remove code inside the change2
so when i hit chnage2 it deltes and object form "chnage" and the Wallup object
Do you know how to do this dan?
You should be able to use:
This will remove ALL Wallup and Change objects.
1 2 | getWorld().removeObjects(Wallup.class);getWorld().removeObjects(Change.class); |
i only wanted to remove one but i know how to now
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