Newbie question with animation

Programming Questions

simonewes..

Newbie question with animation

in Programming Questions • 1 year ago

Hello,

I have just started yesterday with processing and want to try to make a smiley with a changing smile.

The problem is, that I can't find the mistake. Either the animation is too fast or the programm dont count.

I don't want a solution - only a hint.

Thanks

Simone

void setup()

{

size(400,400);

background(255);

strokeWeight(5);

smooth();

}

void draw()

{

fill (255,255,0);

ellipse(200,200,350,350);

fill (255,255,255);

ellipse (150,150,50,70);

ellipse (250,150,50,70);

strokeCap(ROUND);

line (200,170,200,210);

smile();

}

void smile()

{

int i=1;

//stroke(255,255,0);

//fill(255,255,0);

//rect(150,250,100,40);

stroke(0,0,0);

arc(200,250,100,(0+i),0,PI);

if (i<=40) i=i+1;

}

Replies(1)

tfguy44

Re: Newbie question with animation

1 year ago

Your problem is one of variable scope. You define the variable i to have the value 1 each time smile() is called. This variable, i, only exists within this function. Once smile() has ended, the variable i no longer exists... until smile() is called again when the next frame is drawn, at which time it is, once again, given the value of 1.

What you need to do is make i a global variable, so that it exists outside of any function. Like so:

int i;
void setup()
{
size(400, 400);
background(255);
strokeWeight(5);
strokeCap(ROUND);
smooth();
i = 1;
}
void draw()
{
fill (255, 255, 0);
ellipse(200, 200, 350, 350);
fill (255, 255, 255);
ellipse (150, 150, 50, 70);
ellipse (250, 150, 50, 70);
line (200, 170, 200, 210);
stroke(0, 0, 0);
arc(200, 250, 100, i, 0, PI);
if (i<=40) {
i++;
}
}

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