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expo-phaser

Build awesome 2D games with Phaser.js and Expo

授权协议 MIT License

开发语言 Java

所属分类手机/移动开发、手机游戏

软件类型开源软件

地区不详

投递者徐鸿文

操作系统 Android

开源组织无

适用人群未知

软件概览

expo-phaser

Tools for using Phaser-ce to build native 2D games in Expo ��

Installation

yarn add expo-phaser

Usage

Import the library into your JavaScript file:

import ExpoPhaser from "expo-phaser";

Functions

`ExpoPhaser.game({ context: WebGLRenderingContext, ...extras })`

Given a context from anExpo.GLView, return aPhaser.Gamethat draws into it.

Props

Property	Type	Description	Default Value
context	WebGLRenderingContext	Required: context that the `Phaser.Game` will render to	`null`
width	number?	Optional: height of the `Phaser.Game`	`context.drawingBufferWidth`
height	number?	Optional: width of the `Phaser.Game`	`context.drawingBufferHeight`
title	string?	Optional: title of the `Phaser.Game`	`"expo-phaser-game"`
preventLoop	boolean?	Optional: Prevents the app from calling `context.endFrameEXP()` every frame	`false`

Returns

Property	Type	Description
game	`Phaser.Game`	The Phaser-ce game used for rendering game logic

Example

const game = ExpoPhaser.game({ context });

What does it do?

Under the hood, ExpoPhaser is maintaining global instances of a few libraries.

window.PIXI = require("phaser-ce/build/custom/pixi");
window.p2 = require("phaser-ce/build/custom/p2");
window.Phaser = require("phaser-ce/build/phaser");

Other libs can be included but are not required. For instance you can import the custom Creature lib the same way.We also override the PIXI.WebGLRenderer.updateTexture to make it compatible with Expo.

Finally when a new instance of Expo.Game is created, we set the document.readyState to 'complete' and save the global instance of context

global.__context = context;
global.document.readyState = "complete";

Then we create a standard render loop and call context.endFrameEXP() to flush the frame queue and render our context through EXGL.

const render = () => {
  requestAnimationFrame(render);
  context.endFrameEXP();
};

Example

It's important to note that you must preload all of your assets before starting the app, as the Phaser.State.preload method cannot be asynchronous.Creating a game in Expo is very simple with ExpoPhaser, we preload our assets, create a view, initialize our game, then add our assets.

We create an Expo.GLView to render our game to.

return (
  <Expo.GLView
    style={{ flex: 1 }}
    onContextCreate={context => startGame({ context })}
  />
);

Then we create our Phaser.Game instance and assign it a playable state. We can then choose to start said state.

function startGame({ context }) {
  const game = ExpoPhaser.game({ context });

  game.state.add("Playable", {
    preload: function() {
      /// This function cannot be async, preload all assets before getting here.
      game.load.image(
        "man",
        Expo.Asset.fromModule(Assets["man.json"]).localUri
      );
    },
    create: function() {},
    update: function() {}
  });

  game.state.start("Playable");
}

Preloading

In React Native all assets must be static resources, because of this we must create a reference to all the assets we may use, then download them and get their local URI.Expo has a convenient way of saving reference. We preload an Expo.Asset then if we create the same instance later we can simple call asset.localUri.

In a standard Phaser app we would load an asset like this:

game.load.image("man", "./assets/man.png");

In expo we would load it like this:

const preloadedExpoAsset = Expo.Asset.fromModule(require('./assets/man.png'))
await preloadedExpoAsset.downloadAsync();

...

game.load.image('man', preloadedExpoAsset.localUri);

All together

This example shows how to load an animated texture atlas and apply arcade physics to it.

import React from "react";
import Expo from "expo";
import ExpoPhaser from "expo-phaser";

const Assets = {
  "man.png": require("./assets/man.png"),
  "man.json": require("./assets/man.json")
};

export default class App extends React.Component {
  state = { loading: true };
  async componentWillMount() {
    const downloads = [];
    for (let key of Object.keys(Assets)) {
      const asset = Expo.Asset.fromModule(Assets[key]);
      downloads.push(asset.downloadAsync());
    }
    await Promise.all(downloads);
    this.setState({ loading: false });
  }
  render() {
    if (this.state.loading) {
      return <Expo.AppLoading />;
    }

    return (
      <Expo.GLView
        style={{ flex: 1 }}
        onContextCreate={context => startGame({ context })}
      />
    );
  }
}

function startGame({ context }) {
  const game = ExpoPhaser.game({ context });

  game.state.add("Playable", {
    preload: function() {
      const atlas = Expo.Asset.fromModule(Assets["man.json"]).localUri;
      const texture = Expo.Asset.fromModule(Assets["man.png"]).localUri;
      game.load.atlasJSONHash("man", texture, atlas);
    },
    create: function() {
      game.stage.backgroundColor = "#4488AA";

      game.physics.startSystem(Phaser.Physics.ARCADE);

      //  Set the world (global) gravity
      game.physics.arcade.gravity.y = 100;

      const man = game.add.sprite(200, 200, "man");
      game.physics.enable([man], Phaser.Physics.ARCADE);

      //  Here we add a new animation called 'run'
      //  We haven't specified any frames because it's using every frame in the texture atlas

      man.animations.add("run");
      man.body.collideWorldBounds = true;
      man.body.bounce.y = 0.8;
      man.body.gravity.y = 200;

      //  And this starts the animation playing by using its key ("run")
      //  15 is the frame rate (15fps)
      //  true means it will loop when it finishes
      man.animations.play("run", 15, true);
    },
    update: function() {}
  });

  game.state.start("Playable");
}

note: When working with .json asset inclusion, be sure to update the app.json file to handle .json appropriately.

"packagerOpts": {
  "assetExts": [
    "json"
  ]
},

Demo

Within this repo is an examples/basic demo.

使用案例

Phaser3之Tweens

NumberTweenBuilderConfig Phaser.Tweens.Tween Phaser.Math.DegToRad(deg) // 将给定的角度从度数转换为以弧度为单位的等效角度。 var tween = this.tweens.add(...); // 添加动画 tween.stop(); // 停止动画 tween.resume(); // 恢复之前暂停的 Tween 的播放。

expo-phaser

expo-phaser

Installation

Usage

Functions

`ExpoPhaser.game({ context: WebGLRenderingContext, ...extras })`

Props

Returns

Example

What does it do?

Example

All together

Demo

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