From the course: Advanced iOS App Development: Core Animation

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Customizing emitter cells

Customizing emitter cells - iOS Tutorial

From the course: Advanced iOS App Development: Core Animation

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Customizing emitter cells

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- [Instructor] To actually give these fireworks some movement, we're gonna add acceleration to the X and Y direction of the cell. I wanna give this a pretty big boost up in the Y direction, so I'm gonna say fireworkCell.yAcceleration equals 100. But I also want it to sort of veer off to the side and eventually create an arc. So I'm also going to set the X acceleration to 15, so it's very slight. With acceleration added, we need to specify a velocity, which will get the fireworks firing just a bit faster when they're created. So I'm gonna say fireworkCell.velocity. And as the base, I'm gonna give it a value of 50. Let's save the app and run. And we should see our fireworks going up and arcing to the right a bit, and then falling and disappearing once their lifetime ends. Alright, so that's a good start. Next, we're gonna set the emission longitude of the cell, so that it has a defined orientation or direction when it's created. So let's say fireworkCell.emissionLongitude. And this is…

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