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Topic: accessing variables in classes (Read 261 times) |
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magigale
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accessing variables in classes
« on: May 28th, 2004, 1:42pm » |
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How do you access a variable, that's in a class further down the page?
Here's the code i'm working on
/*
by matt gale
www.room106.co.uk/gale
*/
void loop()
{
background(0); // background
noStroke();
smooth();
rotateX(TWO_PI/360*30);
translate(100,0);
if (txt==1)
{
fill(255);
textMode(ALIGN_CENTER);
text("use arrow keys to control ship",100,130);
text("'e' key to transfer fuel from energy",100,150);
text("touch me to continue",100,190);
grav=40;
fuel=100;
energy=100;
time=0;
}
fill(255);
text(timeD,170,20);
time=time+0.03;
if (time>1 && energy>0)
{
timeD=timeD+1;
time=0;
}
for (int i=0;i<10;i++)
{
myBalls[i].run();
}
for (int i=0;i<fb;i++)
{
myFuel[i].run();
}
fill(100,100,200);
rect(4,4,7,102);
fill(0,255,0); // fuel, if fuel is full
if (fuel<50) // fuel, if fuel is less than 50
{
fill(255,255,0);
}
if (fuel<25) // fuel, if fuel is less than 25
{
fill(255,0,0);
}
rect(5,5,5,fuel); //fuel
fill(100,100,200);
rect(189,4,7,102);
fill(0,255,0);
if (energy<50)
{
fill(255,255,0);
}
if (energy<25)
{
fill(255,0,0);
}
rect(190,5,5,energy); // energy
translate(xPos,grav,0); // position of triangle
for (int i=0;i<fb;i++)
{
if(xPos > hitX/*this is where the problem is*/ -10 && xPos < hitX +10 && grav > hitY +10 && grav < hitY -10 )
{
fuel=fuel+50;
}
}
fill(100,100,200);
if (keyPressed == false && energy>0)
{
drawShip();
xT=0;
}
if (keyPressed)
{
if (key == DOWN && energy>0)
{
drawShip();
}
}
if (keyPressed) // thrust
{
if (key == DOWN && energy>0)
{
if (fuel>0)
{
drawShip();
xT=2;
fuel=fuel-0.5;
drawFlames();
}
}
else
{
xT=0;
}
}
if (keyPressed) // left key
{
if (key == LEFT && energy>0)
{
xPos=xPos-1;
rotateY(TWO_PI/360*315);
drawShip();
}
}
if (keyPressed) // right key
{
if (key == RIGHT && energy>0)
{
xPos=xPos+1;
rotateY(TWO_PI/360*45);
drawShip();
}
}
if(xPos==0) // limit left direction
{
xPos=1;
}
if(xPos==200) // limit right direction
{
xPos=199;
}
if (grav==160 && energy==0) // limit hight (down)
{
grav=159;
}
if (grav==160)
{
grav=159;
energy=energy-0.5; // takes off energy if your at bottom of screen
}
else
{
grav=grav+1-xT;
}
if (grav<0) // limit hight (up)
{
grav=1;
}
if (keyPressed) // energy button
{
if (key == 'e' && energy>0 || key == 'E' && energy>0)
{
drawShip();
energy=energy-1;
fuel++;
}
}
if (energy<0) // stops energy becoming less than 0
{
energy = 0;
}
if (fuel>100) // stops fuel going over 100
{
fuel = 100;
}
if (energy==0) // if there is no energy, then 'game over' is displayed
{
fill(255);
text("game over",100-xPos,-5);
text(timeD,100-xPos,10);
}
}
class Ball
{
float x;
float y;
void run()
{
drawStar();
y=y+1;
if (y>200)
{
y=0;
x=random(-100,300);
}
}
void drawStar()
{
ellipseMode(CENTER_RADIUS);
fill(255,255,255,200);
ellipse(x,y,2,2);
}
}
class FuelCell
{
float hitX;
float hitY;
void run()
{
drawStar();
hitY++;
if (hitY>200)
{
hitY=0;
hitX=random(10,190);
}
}
void drawStar()
{
ellipseMode(CENTER_RADIUS);
fill(50,50,200,200);
ellipse(hitX,hitY,4,4);
}
}
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TomC
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Re: accessing variables in classes
« Reply #1 on: May 28th, 2004, 1:49pm » |
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Can you try posting a shorter example, so we know what it is you're stuck on.
In general, Java won't mind *where* in your program something is specified, or declared, so long as it is in scope.
So I can do:
Code:
void setup() {
obj.doSomething();
println(obj.value);
}
Obj obj = new Obj();
class Obj {
int value = 10;
void doSomething() {
println("it worked!");
}
}
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Is that what you meant?
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