/// platform physics

var rkey = keyboard_check(vk_right);
var lkey = keyboard_check(vk_left);
var jkey = keyboard_check_pressed(vk_up);

// Check for ground
if (place_meeting(x, y+1, obj_solid)) {
    airjump = 1;
    vspd = 0;

    // Jumping
    if (jkey) {
        vspd = -jspd;
    }
} else {
    //Gravity
    if (vspd < 10){
        vspd += grav;
        }

        if(keyboard_check_released(vk_up) && vspd <-4) {
            vspd = -4;
        }

        //Check for airjump
        if (airjump > 0){
            if (jkey) {
            vspd = -jspd;
            airjump -= 1;
            }
        }
}


// Moving right
if (rkey) {
    hspd = spd
}

// Moving left
if (lkey) {
    hspd = -spd;
}

// Check for not moving
if ((!lkey && !rkey) || (rkey && lkey)) {
    hspd = 0;
}

// Horizontal collisions
if (place_meeting(x+hspd, y, obj_solid)) {
    while (!place_meeting(x+sign(hspd), y, obj_solid)) {
    x += sign(hspd);
    }
    hspd = 0;
}

//Move horizontally
x += hspd;

// Verical collisions
if (place_meeting(x, y+vspd, obj_solid)) {
    while (!place_meeting(x, y+sign(vspd), obj_solid)) {
    y += sign(vspd);
    }
    vspd = 0;
}
// Move vertically
y += vspd;