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Aquaplane - help me understanding waves creation

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Can you guys that read book "Interphase 1" help me understanding how one can determine that emitter will generate particles in V format (in really a symbol like an "<") that give us the impression of waves behind the boat.

I read and re-read that part of code but I failed to figure it out.

Thank you all.

Note: I don't publish the source code of the game so anyone could answer because I don't think I am allowed to.

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The cause of the < shape is because of these 3 lines:

        this.emitter.gravity = 0;
        this.emitter.setXSpeed(-100, -250);
        this.emitter.setYSpeed(-100, 100);

Gravity 0 stops the particles from falling.

X speed is basically "move left (because the values are negative) at a random speed between 100 and 250". If you remove the minus signs they'll move to the right instead.

Y speed is similar - basically "have a Y velocity between -100 (up) and 100 (down)". The limit on those values, combined with the X speed, is what causes it to emit in a fan shape. Try changing the Y values from +-100 to +-50 and notice the effect - a much narrower fan. Or try +-200 for a wider one. Or try -100, -50, and they'll only move up.

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Soon, I promise. I've been literally snowed under with other tasks, and it took a bit of a back seat. But I've been cranking out the chapters again recently, so am happy with how it's shaping up. Subscribe to the Phaser World newsletter (if you don't already) as I'll announce updates in there.

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