draw my random array shape only once, it keeps looping

Programming Questions

tru27rooe

draw my random array shape only once, it keeps looping

in Programming Questions • 1 year ago

Hello I asked this question earlier but I think I put it on the wrong post so my apologies if I am repeating the same question, I will delete the other post:)

Anyway I have an array with random shapes I call via class I created my problem is when I choose to draw the random shape I have choosen it keeps picking a random shape then drawing it over and over again. I know the draw method is a loop, but I just cant figure out how to make it draw just one shape once instead of looping any help please

int numshapes = 3;
Shape[] shapes = new Shape[numshapes];
void setup()
{
shapes[0] = new Rectangle();
shapes[1] = new Circle();
shapes[2] = new Lined();
size(800,800);
}
void draw()
{
shapes[int(random(0, shapes.length))].draw();
}
interface Shape
{
void draw();
}
class Rectangle implements Shape
{

void draw()
{
rect(25,25,25,25);
}
}
class Circle implements Shape
{
void draw()
{
ellipse(25,25,25,25);
}
}
class Lined implements Shape
{
void draw()
{

line(90,90,90,90);
}
}

Replies(5)

tru27rooe

Re: draw my random array shape only once, it keeps looping

1 year ago

any help please would be appreciated

calsign

Re: draw my random array shape only once, it keeps looping

1 year ago

I'm not sure that I quite understand your problem...
Do you want noLoop()?
Or, perhaps, does calling background(255); help?

tru27rooe

Re: draw my random array shape only once, it keeps looping

1 year ago

yeah I want a no loop, if I type cast noLoop() in set up that will work, however was there another way?

I have my array containing 3 shapes, and in the draw method I use

shapes[int(random(0, shapes.length))].draw();

to pick one random shape and draw it, however it keeps picking a random shape and drawing it over and over again

so for example: the circle is drawn, next frame square, then circle again it just keeps repeating it. I cant figure out how to pick one random shape from my array without the array looping

I know its probably something so simple but I cant figure it out

sorry for the confusing question

tfguy44

Re: draw my random array shape only once, it keeps looping

1 year ago

You don't want to be drawing a random shape each frame.
You want to pick one of the three random shapes just one time, and then draw that shape every frame.
To do this, you need to move where the random index for your shapes array is being generated.

You should define a new global variable:

int randIndex;

You should assign it a random value in setup() (remember, setup() only runs once!):

randIndex = int(random(0, shapes.length));

And then you should use that variable to determine which shape to draw:

void draw()
{
shapes[randIndex].draw();
}

tru27rooe

Re: draw my random array shape only once, it keeps looping

1 year ago

Ahhhhh I get it, that makes perfect sense...It works perfect....Thank you so much for your help it is greatly appreciated. I was trying to figure that out all day so you saved me! Thanks again man much appreciated!