027 : Collide with platform
Balthazar:
You already added a collide() function when you added the goal. You can re-use that function if you make one small change to how you've implemented platforms.
Balthazar:
The collide() function expects each object being checked to have an origin_x and origin_y. You don't want to change the origin for the platforms, so these values can both be set to 0.
function create_platform(x, y, width, height) {
var p = {};
p.x = x;
p.y = y;
p.width = width;
p.height = height;
p.origin_x = 0;
p.origin_y = 0;
return p;
}
p.origin_x = 0;
p.origin_y = 0;
return p;
}
Balthazar:
With that change in place, you can now add your platform collision checks.
function check_collisions() {
check_platform_collisions();
check_goal_collisions();
}
function check_platform_collisions() {
if (collide(_game.platform, _player)) {
_player.y = _game.platform.y;
_player.velocity_y = 0;
}
}
function check_goal_collisions() {
...
}
check_platform_collisions();
check_goal_collisions();
}
function check_platform_collisions() {
if (collide(_game.platform, _player)) {
_player.y = _game.platform.y;
_player.velocity_y = 0;
}
}
function check_goal_collisions() {
...
}
RUN your code in a browser and verify that it loads without errors.