tomprogers / so-67453408

Minimally viable reproduction repo for question 67453408

Why is my Phaser3 sprite rendering in the wrong location?

This repo is a minimal reproducible example of bad rendering behavior of Phaser within Electron. It has been created to supplement this question on StackOverflow.

Note: I have only tested this on MacOS.

To run it

yarn && yarn start

After dependencies are installed and the app builds, a new application window will open. Within that window, you'll see:

• the page has a white background
• there is a black <canvas> rectangle in the top-left, with dimensions 400px by 200px; there is nothing else on the page
• in the top-left corner of the <canvas>, you'll see a red square that's 100px on a side, with a 1px green border that's visible on all four sides of the square

What's wrong?

Open src/scene.js and look at line 23: the sprite is being placed at coordinates (200,100) even though it displays in the top-left corner.

To the best of my knowledge, the correct coordinates for that position should be (0,0).

Notably, (200,100) is half the canvas dimensions. If you increase the canvas size to e.g. 600px by 300px, to achieve the same position, you must place the sprite at (300,150), which is also not how it's supposed to work.

There's nothing else going on in this repo.

To make edits

Note that this repo does not do hot-reloading, because this is supposed to be a minimal example. If you want to see your changes, you must kill the Electron app and then re-run yarn start.