Enemy rotate to player

[IAsep-TrixI]

does anyone know how to make a drawn picture (aka an enemy) rotate to the player?

kind of like this

[raidho36]

In enemies code, put computation of an angle towards the player (math.atan2) and use obtained angle for drawing operation.

[IAsep-TrixI]

In enemies code, put computation of an angle towards the player (math.atan2) and use obtained angle for drawing operation.

Code: Select all

enemies.r = math.atan2((enemies.y - player.y), (enemies.x - player.x))

alright, I set math.atan and appended the enemies.r variable into enemies.draw

Code: Select all

love.graphics.draw(enemies.pic,(v.x - 15),v.y,0,enemies.scaleX,enemies.scaleY)

but its rotating somewhere else instead of rotating to the player's direction

[raidho36]

It rotates in opposite direction, starting at 0 degrees (dead right). This is because math.atan2 operates in generic math coordinate grid where Y axis facing up, whereas LÖVE uses computer-graphics-style Y axis that points down. Either use negative of Y argument (just swap player and enemy coordinates), or use negative of function result.

[IAsep-TrixI]

It rotates in opposite direction, starting at 0 degrees (dead right). This is because math.atan2 operates in generic math coordinate grid where Y axis facing up, whereas LÖVE uses computer-graphics-style Y axis that points down. Either use negative of Y argument (just swap player and enemy coordinates), or use negative of function result.

It still doesnt work for some reason.

[raidho36]

I just noticed that you said you used math.atan. You should use math.atan2, although the code snippet uses it. For some reason, drawing snippet doens't have any kind of reference to rotation and it's explicitly set to 0. I suggest you posting the real code you use.

[BlackBulletIV]

This is because math.atan2 operates in generic math coordinate grid where Y axis facing up, whereas LÖVE uses computer-graphics-style Y axis that points down.

Oh, so that's why angles move clockwise in LÖVE.

[IAsep-TrixI]

I just noticed that you said you used math.atan. You should use math.atan2,

Ah, it works now. Thanks raidho!