By Jonathan Penn, Josh Smith
Strength up your internal online game developer and begin construction fabulous video games with Sprite package. This publication will educate you every thing you must find out about Apple's second online game engine. in case you have a few programming adventure yet you are new to video game improvement, you are going to hit the floor working, no complicated instruments required—just the Sprite package SDK. you will commence quickly through development a single-finger limitless runner video game, the place the target is to stick alive so long as attainable and rack up issues. you are going to discover the Sprite equipment template, activities, and particle editor and watch your video game take form with an armed participant send, asteroids and enemy ships, explosions, power-ups, and variable hassle. Then you will sew the sport including cutscenes, menus, and scoring.
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Extra resources for Build iOS Games with Sprite Kit: Unleash Your Imagination in Two Dimensions
We have single-finger game control, projectiles, enemies to avoid, and power-ups to collect. But a game’s mechanics aren’t the only things that make it fun. Many 2D games today add flair and polish in the form of particle effects. We, too, can give players a delightful experience with these special effects to catch their eye and stimulate their palate. Sprite Kit makes it easy to implement many kinds of particle effects. We’ll explore two different techniques based on the kind of feel we want to evoke in our game.
Using our own private update loop will work better. Note that because we need to call a method on self from inside the block, we must to create a weak reference to it. This is what we’re doing with the weakSelf variable. info report erratum • discuss Generating a Parallax Field of Stars • 39 a strong reference to the action. If the block held a strong reference to self (the node in this case), then the action, the block, and the node would form a retain cycle and never get deallocated. This weak-self setup is Apple’s way of protecting against that cycle and stopping memory leaks.
Info report erratum • discuss Chapter 3. Explosions and Particle Effects • 40 a random alpha to vary the transparency. 1 to make sure it shows up. Little tweaks like this help add to the effect of deep space. Feel free to play with the values to adjust to taste. At the end of the method, we create the move-and-remove action sequence that makes the star travel down the screen and leave the scene when done. By using a random duration value for the move action, we get stars with different speeds. This gives the illusion of parallax, where things that are closer appear to pass by more quickly than things that are farther away, as you can see in the following figure.
Build iOS Games with Sprite Kit: Unleash Your Imagination in Two Dimensions by Jonathan Penn, Josh Smith