Drawing ellipses with random function in array

Programming Questions

joepheijn..

Drawing ellipses with random function in array

in Programming Questions • 1 year ago

Hey guys,

I am a newbie in processing:)

I have tried a week to figure it out, but i can't find the solution.

The problem is: I need to draw ellipses on different locations with the function random.

But everytime i try to draw the ellipses with the function for and array, the ellipses are drawn on the same position.

My code:

int windowBreedte = 600;

int windowHoogte = 600;

float ellipseXRandom = random(windowBreedte / 20, windowBreedte - windowBreedte / 20 * 2);

float ellipseYRandom = random(windowHoogte / 20, windowHoogte - windowHoogte / 20 * 2);

int ellipseX = round(ellipseXRandom);

int ellipseY = round(ellipseYRandom);

int index = 6;

int [] balletjesX = new int [index];

int [] balletjesY = new int [index];

void setup() {

size(windowBreedte, windowHoogte);

smooth();

}

void draw() {

background(255);

fill(#71E507);

rect(width / 20, height / 20, width - width / 20 * 2, height - height / 20 * 2 );

balletjesX[0] = ellipseX;

balletjesX[1] = ellipseX;

balletjesY[0] = ellipseY;

balletjesY[1] = ellipseY;

for (int i = 0; i < index; i++) {

ellipse(balletjesX[i], balletjesY[i], 20, 20);

}

Thanks

Replies(1)

PhiLho

Re: Drawing ellipses with random function in array

1 year ago

The code you put before setup() (limited to declarations and initializations) is run only once, before setup() is run (once too).
If you want random positions, you need to initialize them in setup(), drawing a random number each time you need it.

int index = 6;
int[] balletjesX = new int[index];
int[] balletjesY = new int[index];
void setup() {
size(600, 600);
smooth();
for (int i = 0; i < index; i++) {
// Use width and height instead of custom variables doing the same thing
balletjesX[i] = int(random(width / 20, height - height / 20 * 2));
balletjesY[i] = int(random(width / 20, height - height / 20 * 2));
}
}
void draw() {
background(255);
fill(#71E507);
rect(width / 20, height / 20, width - width / 20 * 2, height - height / 20 * 2 );
for (int i = 0; i < index; i++) {
ellipse(balletjesX[i], balletjesY[i], 20, 20);
}
}