What is a Group?

In p5play a Group is a collection of and blueprint for sprites with similar traits and behaviors. For example the dots in Pac-Man!

The group.length property can be used to check how many sprites are in a group. In this example the while loop condition is true as long as the dots group has less than 24 sprites.

In the code example, new dots.Sprite creates a sprite that inherits the dots group's color, y position, and diameter. Each dot is assigned a unique x position.

I call this "soft inheritance" because a group acts as a blueprint for new group sprites.

dots
let dots;
function setup() {
new Canvas(500, 50);
dots = new Group();
dots.color = 'yellow';
dots.y = 25;
dots.diameter = 10;
while (dots.length < 24) {
let dot = new dots.Sprite();
dot.x = dots.length * 20;
}
}
 
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You can access a sprite in a group by index because groups are arrays. You can use any of the standard JavaScript array methods on a group.

green dot
dots[5].color = 'green';
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Setting a group's property to a different value will affect all the sprites in the group! I call this "dynamic inheritance".

green dots
dots.color = 'green';
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Using movement functions like moveTowards on a group, will cause all the sprites in a group to move.

moving dots
dots.moveTowards(mouse);
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