i am very new to the greenfoot i want some to teach me and help me in this if possible can show me his or her scenario just for references .......thanks in advance
asiftahir wrote ...
2013/8/20
need refrences
If you want to learn something about references you should read this greenfoot tutorial or have a look at this scenario.
When you download Greenfoot, you also get several sample scenarios you can look at. Also, any scenario on this site that has a large green 'Open in Greenfoot' button to the upper-right of its window can be downloaded and the code looked at.
i dont want move continuously...i want that only when i press the key it moves what can be the codes for it......????
public void move()
{
//movement using the wasd keys
if (Greenfoot.isKeyDown("a"))
{
moveLeft();
}
if (Greenfoot.isKeyDown("d"))
{
moveRight();
}
if (Greenfoot.isKeyDown("w"))
{
moveUp();
}
if (Greenfoot.isKeyDown("s"))
{
moveDown();
}
}
i wrote all this and called the move() in the public void act()...... but the error is coming that cannot find the symbol...method moveleft().........
The problem is that you try to call the method moveLeft but this method doesn't exist.
You need to declare it:
If you add this methods to your class it should work.
public void moveLeft() {
setLocation(getX() - 1, getY());
}
public void moveRight() {
setLocation(getX() + 1, getY());
}
public void moveUp() {
setLocation(getX() , getY() - 1);
}
public void moveDown() {
setLocation(getX(), getY() + 1);
}thanks bro.....i have one more question if i want tht moveLeft to work how i make make it work and declare ,,,,,,,,,,,,,, and ur code is working fine thanks for tht codes....
You can also alter Tod's code so you can select what speed you want it to move at, like so:
and to use the code use:
public void moveLeft(int left) {
setLocation(getX() - left, getY());
}
public void moveRight(int right) {
setLocation(getX() + right, getY());
}
public void moveUp(int up) {
setLocation(getX() , getY() - up);
}
public void moveDown(int down) {
setLocation(getX(), getY() + down);
}public void move()
{
//movement using the wasd keys
if (Greenfoot.isKeyDown("a"))
{
moveLeft(2);//change number to whatever you like
}
if (Greenfoot.isKeyDown("d"))
{
moveRight(2);//change number to whatever you like
}
if (Greenfoot.isKeyDown("w"))
{
moveUp(2);//change number to whatever you like
}
if (Greenfoot.isKeyDown("s"))
{
moveDown(2);//change number to whatever you like
}
}I prefer determining the direction to move before moving:
The above will allow four-way movement only.
To allow eight-way movement (allowing diagonal motion), do the following:
You can continue the code in the method to perform intersection checking as follows:
public void move()
{
int dx = 0, dy = 0;
if (Greenfoot.isKeyDown("right")) dx++;
if (Greenfoot.isKeyDown("left")) dx--;
if (Greenfoot.isKeyDown("down")) dy++;
if (Greenfoot.isKeyDown("up")) dy--;
if (dx*dy == 0 && dx+dy != 0) setLocation(getX()+dx, getY()+dy);
}// change the last line to if (dx !=0 || dy != 0) setLocation(getX()+dx, getY()+dy);
if (!getIntersectingObjects(null).isEmpty()) setLocation(getX()-dx, getY()-dy);
// or
if (!getIntersectingObjects(Some.class).isEmpty() ||
!getIntersectingObjects(Another.class).isEmpty() ||
!getIntersectingObjects(Etc.class).isEmpty())
setLocation(getX()-dx, getY()-dy);If you are using the code 8bitcarrotjuice gave you you can expand this code with some variables for the speed and incrase them after a while:
This will make your actor move faster every 1000 acts.
private int movingSpeed = 1;
private int actCounter = 0;
public void act() {
if (Greenfoot.isKeyDown("up")) {
moveUp(movingSpeed);
}
//...
actCounter++;
if (actCounter >= 1000) {
actCounter = 0;
movingSpeed++;
}
}And you can also update Tod's code further by merging all the mehods into one, like so:
or you can use Dan's 'move()' method!
Not sure how to initilize an exception... Help?
private int movingSpeed=1;
private int actCounter=0;
public void Move(int speed,String direction) {
if(direction=="up")
setLocation(getX(), getY()-speed);
else if(direction=="down")
setLocation(getX(), getY()+speed);
else if(direction=="left")
setLocation(getX()-speed, getY());
else if(direction=="right")
setLocation(getX()+speed, getY());
else
//throw new Exception("Incorrect Direction Entered.");
}
public void act()
{
if (Greenfoot.isKeyDown("a"))
Move(movingSpeed,left);
if (Greenfoot.isKeyDown("d"))
Move(movingSpeed,right);
if (Greenfoot.isKeyDown("w"))
Move(movingSpeed,up);
if (Greenfoot.isKeyDown("s"))
Move(movingSpeed,down);
actCounter++;
if(actCounter>=1000) {
actCounter=0;
movingSpeed++;
}
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