Field Component.x is not visible!

Programming Questions

giseth

Field Component.x is not visible!

in Programming Questions • 1 year ago

Im trying to make a simple ellipse move from A to B, but keep getting this error ..

void setup() {
size(800, 600);
x = width / 2;
y = height / 2;
fill (#4060FF);
strokeWeight(2);
stroke(0);
smooth();
}
void draw() {
x += velX;
y += velY;
if (x+r >= width || x-r <= 0) {
velX = -velX;
}
if (y+r >= height || y-r <= 0) {
velY = -velY;
}
background(255);
ellipse(x, y, d, d);
}

Replies(1)

PhiLho

Re: Field Component.x is not visible!

1 year ago

If that's all your code, you miss some essential thing: you need to declare all your variables!
x and y must be declared at the global level, since they are used by both setup() and draw(), the other variables can be declared inside draw().

If you come from an interpreted language, it can be surprising, they often create variables the first time they are used, but in Java / Processing, you must declare them, indicating their type (int, String, etc.).

Top Reply