#Game maker studio 2 platformer engine how to
#Game maker studio 2 platformer engine code

State_is_new = _state_current != state_current

Finally we run the move_and_collide script which will take those manipulated xvel and yvel speeds and move the player accordingly while managing collisions.Apply some arbitrary speed to the xvel and flip the sprite accordingly (or stop the player from moving if no input is detected).In the step event of the player we do 4 things In the create event we setup some variables for movement (and a very basic state machine which weвЂ™ll expand in later posts). Because of this distinction, weвЂ™re able to let objects go a little bit вЂњinsideвЂќ slopes. ItвЂ™s important to note that weвЂ™re targeting oWall with bounding box collision checks (a collision_line would have provided the same result but I read somewhere itвЂ™s slower than a collision_rectangle) while weвЂ™re targeting oSlope with a collision_point, centered in the origin (still using the bounding box for vertical point positioning though, just in case you use different bounding box sizes). Return collision_point(x, bbox_bottom + 1, oSlope, true, true) Return collision_rectangle(bbox_left, bbox_bottom + 1, bbox_right, bbox_bottom + 1, oWall, false, true) return the colliding slope instance or noone if none return instance_id of the colliding instance or noone if none found In the future, it will signal us even when the player is standing on a jump-though platform. It relies on two other scripts to return the colliding instance below (or noone if none found). ItвЂ™s a simple script but you can already tell itвЂ™s doing a lot of things for us. return instance_id of the colliding ground object or noone if not colliding

#Game maker studio 2 platformer engine code

For this reason we code a on_ground script like this one. Because of that, we need a way to tell if an object is on the ground be it on an oWall or a oSlope.

#Game maker studio 2 platformer engine how to

You need to know how to behave based on the answer to this question so itвЂ™s essential to get this script right. This question needs answering in a lot of different contexts. Coding the Engine Is the object on the ground? This new system lets the objects go a little вЂњinsideвЂќ the slopes and it doesnвЂ™t look that weird anymore.