Rectangle Rotate Function

Phaser 3
1

Hi,

Just wondering why there isn’t a rotate function for rectangles e.g. Phaser.Geom.Triangle.Rotate. I’m trying to emulate this steering tutorial I found, but I can’t seem to find a rotate for rectangles.

I’m not the best at math, so bare with me.

2

I might be missing the point of the question but… Arcade physics doesn’t have rotation. Matter JS (and I believe Impact) do. You can set .rotation (radians), or .angle (degrees)

3

Apart from what quasipickle said, Rectangle shapes are axis-aligned, which means they can’t be rotated. How you’d rotate a rectangle depends on how your code uses it.

As a side note, I don’t think Impact can rotate bodies. Only MatterJS supports complex collision.

4

Hi,

I wasn’t thinking of using a rectangle for collisions/overlays per se, but I guess thinking about your replies that’s what it is. I was just thinking of a rectangle that is projected in front of my enemy ship and can rotate along with it. Kind of like the example below, but with a rectangle.

I’m trying to model some ideas from http://opensteer.sourceforge.net/ where each ship has a long rectangular box that helps it steer away from obstacles and other ships.

I’ll check into Impact and Matter JS, but I’ve been working on this game for a long time and would like to release it.

Thanks for the help,
DaSoup

5

Think I’ll try two triangles and see how it works.

6

Some other ideas if two triangles does not work for you and you don’t want to use matter/impact.

1: Perhaps create a rectangle using the factory? This will make a gameobject that is like the geom rectangle but can be rotated. this.add.rectangle(…) to create it and then move/rotate it with relation to the ship gameobject and set visible false if the rectangle is not meant to be seen.

2: You can get the points of a Phaser.Geom.Rectangle (or change to Phaser.Geom.Polygon) and then loop through them to update their position using Phaser.Math.RotateAround(…) again using the ship gameobject as a point to rotate around/with.

1 Like
7

I’ll look into those. Thanks. Seems like every door I open in Phaser leads to like five more.

I appreciate the help.