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Strange NullPointerException Error, Please Help! (Read 599 times)
BLARGiAMdEAD
Strange NullPointerException Error, Please Help!
Apr 21st, 2009, 4:10am  
This is my first program in Processing, BTW.
Code:
//Fish by Jonah C.

//Initialize fish and rocks
Fish fish1;
Fish fish2;
Fish fish3;
Fish biggie;
Rock rock1;
Rock rock2;
Rock small1;
Rock small2;
Rock small3;
Rock big1;
Chomp[] bites=new Chomp[1];
int chompCount;

  
void setup() {
//set size and background
  size(1000,400);
  background(255);
//set chomp-array counter to 1
  chompCount=1;
//create local variables used in initialization
  float fishStart=50;
  float rockstartx;
  float rockstarty;
//create random fish
  fish1=new Fish(fishStart,fishStart,int(random(70,100)),int(random(70,100)),1);
  fishStart=950;
  fish2=new Fish(fishStart,fishStart-900,int(random(70,100)),int(random(70,100)),2);
  fishStart=350;
  fish3=new Fish(fishStart-300,fishStart,int(random(70,100)),int(random(70,100)),3);
  fishStart=500;
  biggie=new Fish(fishStart,fishStart-300,int(random(95,120)),int(random(80,110)),4);
//create random rocks
  rockstartx=int(random(800));
  rockstarty=int(random(400));
  rock1=new Rock(int(rockstartx),int(rockstarty),int(random(30,50)),int(random(30,50)));
  rockstartx=int(random(800));
  rockstarty=int(random(400));
  rock2=new Rock(int(rockstartx),int(rockstarty),int(random(30,50)),int(random(30,50)));
  rockstartx=int(random(800));
  rockstarty=int(random(400));
  big1=new Rock(int(rockstartx),int(rockstarty),int(random(95,120)),int(random(95,120)));
  rockstartx=int(random(800));
  rockstarty=int(random(400));
  small1=new Rock(int(rockstartx),int(rockstarty),int(random(10,30)),int(random(10,30)));
rockstartx=int(random(800));
  rockstarty=int(random(400));
  small2=new Rock(int(rockstartx),int(rockstarty),int(random(10,30)),int(random(10,30)));
rockstartx=int(random(800));
  rockstarty=int(random(400));
  small3=new Rock(int(rockstartx),int(rockstarty),int(random(10,30)),int(random(10,30)));
}

//animation loop
void draw() {
//clear screen
  background(255);
//move and refresh fish
  fish1.move();
  fish1.display();
  fish2.move();
  fish2.display();
  fish3.move();
  fish3.display();
  biggie.move();
  biggie.display();
//re-draw rocks
  rock1.display();
  rock2.display();
  big1.display();
  small1.display();
  small2.display();
  small3.display();
}

class Fish {
//initialize fish parameters
  int ident;
  float x;
  float y;
  int count=0;
  float xmov=0;
  float ymov=0;
  PShape f;
  int rota;
  float rad;
  int sizex;
  int sizey;
  int origsizex;
  int origsizey;
  boolean v;
//create fish based on input
  Fish(float tempX, float tempY,int tempsix,int tempsiy,int tempid)  {
    ident=tempid;
    x = tempX;   
    y = tempY;
    sizex=tempsix;
    sizey=tempsiy;
    origsizex=sizex;
    origsizey=sizey;
    v=false;
//load starting sprite
    f=loadShape("fishthing.svg");
    smooth();
  }
  void move() {
    float chase;
//change the directions once every 30 frames, 1st, 31st, etc.
    if (count==0) {
	xmov=random(-2.5,2.5);
	ymov=random(-2.5,2.5);
	v=false;
    }
    count=count+1;
    if (count==30) {
	count=0;
    }
//grow the fish if it is a baby
    if(sizex<origsizex) {
	sizex=sizex+1;
    }
    if(sizey<origsizey) {
	sizey=sizey+1;
    }
//move the fish's location
    x=x+xmov;
    y=y+ymov;
//check for collision against rocks
    if(x+sizex<=rock1.sizex+rock1.x || x>=rock1.x && y+sizey<=rock1.sizey+rock1.y || y>=rock1.y) {
	xmov=-1*xmov;
	ymov=-1*ymov;
    }
    if(x+sizex<=rock2.sizex+rock2.x || x>=rock2.x && y+sizey<=rock2.sizey+rock2.y || y>=rock2.y) {
	xmov=-1*xmov;
	ymov=-1*ymov;
    }
    if(x+sizex<=small1.sizex+small1.x || x>=small1.x && y+sizey<=small1.sizey+small1.y || y>=small1.y) {
	xmov=-1*xmov;
	ymov=-1*ymov;
    }
    if(x+sizex<=small2.sizex+small2.x || x>=small2.x && y+sizey<=small2.sizey+small2.y || y>=small2.y) {
	xmov=-1*xmov;
	ymov=-1*ymov;
    }
    if(x+sizex<=small3.sizex+small3.x || x>=small3.x && y+sizey<=small3.sizey+small3.y || y>=small3.y) {
	xmov=-1*xmov;
	ymov=-1*ymov;
    }
    if(x+sizex<=big1.sizex+big1.x || x>=big1.x && y+sizey<=big1.sizey+big1.y || y>=big1.y) {
	xmov=-1*xmov;
	ymov=-1*ymov;
    }
//check for fish within an area, and chase/run away
    if(ident!=1) {
	if(x+sizex<=fish1.sizex+fish1.x+25 || x>=fish1.x-25 && y+sizey<=fish1.sizey+fish1.y+25 || y>=fish1.y-25) {
	  if(sizex*sizey>fish1.sizex*fish1.sizey+30) {
	    chase=random(.5,1.5);
	    xmov=chase*fish1.xmov;
	    ymov=chase*fish1.xmov;
	    
	  }
	}
	if(sizex*sizey<fish1.sizex*fish1.sizey-30) {
	  if(x>fish1.x && xmov<0 || x<fish1.x && xmov>0) {
	    xmov=-1.2*xmov;
	    ymov=-1.2*ymov;
	  } else {
	    xmov=xmov*1.2;
	    ymov=ymov*1.2;
	  }
	}
    }
    if(ident!=2) {
	if(x+sizex<=fish2.sizex+fish2.x+25 || x>=fish2.x-25 && y+sizey<=fish2.sizey+fish2.y+25 || y>=fish2.y-25) {
	  if(sizex*sizey>fish2.sizex*fish2.sizey+30) {
	    chase=random(.5,1.5);
	    xmov=chase*fish2.xmov;
	    ymov=chase*fish2.xmov;
	  }
	  if(sizex*sizey<fish2.sizex*fish2.sizey-30) {
	    if(x>fish2.x && xmov<0 || x<fish2.x && xmov>0) {
		xmov=-1.2*xmov;
		ymov=-1.2*ymov;
	    } else {
		xmov=xmov*1.2;
		ymov=ymov*1.2;
	    }
	  }
	}
    }
    if(ident!=3) {
	if(x+sizex<=fish3.sizex+fish3.x+25 || x>=fish3.x-25 && y+sizey<=fish3.sizey+fish3.y+25 || y>=fish3.y-25) {
	  if(sizex*sizey>fish3.sizex*fish3.sizey+30) {
	    chase=random(.5,1.5);
	    xmov=chase*fish3.xmov;
	    ymov=chase*fish3.xmov;
	  }
	  if(sizex*sizey<fish3.sizex*fish3.sizey-30) {
	    if(x>fish3.x && xmov<0 || x<fish3.x && xmov>0) {
		xmov=-1.2*xmov;
		ymov=-1.2*ymov;
	    } else {
		xmov=xmov*1.2;
		ymov=ymov*1.2;
	    }
	  }
	}
    }
    if(ident!=2) {
	if(x+sizex<=biggie.sizex+biggie.x+25 || x>=biggie.x-25 && y+sizey<=biggie.sizey+biggie.y+25 |
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BLARGiAMdEAD
Re: Strange NullPointerException Error, Please Help!
Reply #1 - Apr 21st, 2009, 4:12am  
Code:
//Fish by Jonah C., Part II

| y>=biggie.y-75) {
	  if(sizex*sizey>biggie.sizex*biggie.sizey+30) {
	    biggie.v=true;
	    biggie.x=random(1000);
	    biggie.y=random(400);
	    biggie.sizex=10;
	    biggie.sizey=10;
	    expand(bites,bites.length+1);
	    bites[chompCount]=new Chomp(int(x),int(y));
	  }
	}
    }
//reset the fish at the opposite edge if it goes offscreen
    if (x>width) {
	x=0;
    }
    if (y>height) {
	y=0;
    }
    if (x<0) {
	x=width;
    }
    if (y<0) {
	y=height;
    }
//change sprite for direction
	if(xmov>=0) {
	  f=loadShape("fishthing2.svg");
	}
	if(xmov<0) {
	  f=loadShape("fishthing.svg");
	}
  }
  
  void display() {
//display the fish sprite
    shape(f,x,y,sizex,sizey);
  }
}

class Rock {
//initialize rock variables
  int x;
  int y;
  int sizex;
  int sizey;
  PShape r;
  Rock(int tempx, int tempy, int tsizex, int tsizey)  {
//create rocks with given parameters
    x=tempx;
    y=tempy;
    sizex=tsizex;
    sizey=tsizey;
//load the rock sprite
    r=loadShape("rock.svg");
    smooth();
  }
  void display() {
//display the rock sprite
    shape(r,x,y,sizex,sizey);
  }
}

class Chomp {
//initialize Chomp variables
  int x;
  int y;
  PShape p;
  int count;
  Chomp(int tx,int ty) {
//initialize variables 
    x=tx;
    y=ty;
    ******p=loadShape("chomp.svg");
    smooth();
  }
//displays for 30 cycles
  void display() {
    if(count<31) {
	shape(p,x,y,20,10);
	count=count+1;
    }
  }
}


It gets the error at the line with all the asterisks.
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PhiLho 
Re: Strange NullPointerException Error, Please Help!
Reply #2 - Apr 21st, 2009, 5:48am  
Is "chomp.svg" file in the data folder of the sketch?
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WWW  
BLARGiAMdEAD
Re: Strange NullPointerException Error, Please Help!
Reply #3 - Apr 21st, 2009, 2:24pm  
Oh, wait, the name is "CHOMP.svg"!

thanks!
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