Reactive Programming with RxJS (for Embach Mark) by Sergi Mansilla

Author:Sergi Mansilla
Language: eng
Format: epub
Tags: Pragmatic Bookshelf
ISBN: 978-1-68050-129-2
Publisher: The Pragmatic Bookshelf, LLC (573151)

​ y: HERO_Y

​ });

Notice that I used startWith(). This sets the first value in the Observable, and I set it to a position in the middle of the screen. Without startWith our Observable would start emitting only when the player moves the mouse.

Let’s render our hero on the screen. In this game all the characters are triangles (my graphic-design skills are not very impressive), so we’ll define a helper function to render triangles on the canvas, given the coordinates, size, and color, and the direction they’re facing:

spaceship_reactive/hero_1.js

​ ​function​ drawTriangle(x, y, width, color, direction) {

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