Find the angle of a segment from (x1, y1) -> (x2, y2).
The difference between this method and Phaser.Math.Angle.Between is that this assumes the y coordinate travels down the screen.
| name | type | description |
|---|---|---|
| x1 | number |
The x coordinate of the first point. |
| y1 | number |
The y coordinate of the first point. |
| x2 | number |
The x coordinate of the second point. |
| y2 | number |
The y coordinate of the second point. |
The angle in radians.