The problem with using the isGround method in Egg is because there is a problem in WorldLoader. The problem is that you're doing "Color ez = bgmask.getColorAt(x,y);" but the variable bgmask wasn't defined so it's equal to null.
DuckGod wrote ...
2017/3/1
How exactly does this work?
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but it becomes defined here though.
public void testLvl()
{
background= new GreenfootImage("MaskTest.png");
setBackground(background);
bgmask = new GreenfootImage("MaskTest.png");
startx= 100;
starty=500;
addObject(new Egg(), startx,starty);
}
But you have to call that method for it to be defined. Try moving lines 3 - 5 (or copying them) to the constructor method of this class (as line 37 - 39).
I don't see any code that's supposed to make that happen.
I can't stick around all night so I gotta go.
in the player code if you look at physics
the int y means the player's y coords and same for x and on the ground code
it changes yspeed and adds to or subtracts from the y coords like when he runs into a wall it kinda pushes him back or lands on a platform he stops moving down.
public void physics()
{
x+=xspeed;// when moving left or right
y+=yspeed;// fall speed
xspeed *=0.91;//used to slow down but will never reach 0 cuz science!
}private void Grounds()
{
if (world.isGround(getX(), getY()+16))
{ yspeed = 0;
canjump = true; }// to check if standing on the color black
if (world.isGround(getX(), getY()+14) )
{ y -= 1;}//
if (world.isGround(getX(), getY()-14) )
{ y += 1;
if (yspeed < 0){yspeed = 0;}
}//to check if under color black
if (world.isGround(getX()+14, getY()) )
{ x -= 1;
if (xspeed > 0) {xspeed = 0;}
}// to check if trying to run into color black from the right side
if (world.isGround(getX()-14, getY()) )
{ x += 1;
if (xspeed < 0) {xspeed = 0;}
}// to check if trying to run into color black from left side
}Did you uncomment line 141 - the call to the Grounds method? (now "//Grounds();", should be "Grounds();".)
What was the problem in the end?
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