Game Maker Platformer Physics

Howdy everyone!

Today I wanted to post a simple snippet that will solve all your physics needs in Game Maker Studio’s GML language.  Sure, Game Maker will do physics for you, but for a platformer, where physics is one of the most important aspects of the game design, why not write your own so that it feels exactly right!  Anyway, just pack this bad boy into a script and enjoy!  If you get adventurous, feel free to start tweaking it to make it your own!

Also, some of you may notice that this could be done more simply or compactly. Generally I like for my code to be readable, especially for a small, side scrolling game that’s not very taxing.

var grav_speed = argument0;
var vspeed_max = argument1;

// if jumping
if vspeed < 0 {
	// if nothing above
	if place_free(x, y+vspeed-1) {
		gravity = grav_speed;
	}
	// if something above
	else {
		move_contact_solid(90, abs(vspeed)+1);
		vspeed = 0;
	}
}

// if at top of jump
else if vspeed == 0 {
	// if nothing is below
	if place_free(x, y+1) {
		gravity = grav_speed;
	}
	// if something is below
	else {
		gravity = 0;
		vspeed = 0;
	}
}

// if falling
else {
	// if nothing is below
	if place_free(x, y+vspeed+1) {
		gravity = grav_speed;
	}
	// if something is below
	else {
		gravity = 0;
		move_contact_solid(-90, vspeed+1);
		vspeed = 0;
	}
}


// limit vspeed
if vspeed &gt; vspeed_max {
	vspeed = vspeed_max;
}
Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s