Death

Death is simple, if the bird hits something, restart the game. Previously we would have used a collision event, but as a continuation of the relearning process I’m going to show you how to handle collisions in code within the step event

Collision

Add an object name oPipe and assign the corresponding sprite. Then we can add the following code to the bird step event

// oBird Step Event

//// DEATH
{
    colliding_with_pipe = place_meeting(x, y, oPipe);
    if(colliding_with_pipe){
        game_restart();
    }
}

//// GRAVITY
...

//// APPLY MOVEMENT
...

place_meeting: By calling this function with values x, y, and oPipe, we’re asking the question “If I’m at position x, y will I be colliding with an instance of oPipe?”, and then it returns a boolean depending on the answer.

colliding_with_pipe: We then store that boolean in colliding_with_pipe to represent whether or not we’re currently colliding with a pipe. And since it’s a boolean, we can use that as our condition of the if statement. From there we’ll restart the game if the condition is true

Room placement shortcuts

Now we’re going to place the pipelines into the rooms, but there’s some tricks we can use to make this easier on ourselves

Mirroring: We want both upside down sprites, as well as normal ones. Instead of using a new sprite we can mirror it by resizing the pipe. This is the same as giving it a negative image_yscale

Duplication: We can use some keyboard shortcuts to make duplciation easier, in particular here are the ones I used

ctrl + left click: Left clicking usually selects an individual instance, but if you’re holding control, then you can select multiple shift + left drag: If you want to select a bunch over a region, then you can use this to create a rectangle and select all in that region ctrl + c: As usual, you can use this to copy whatever you have selected ctrl + v: Then you can use this to paste

I use these shortcuts to select pairs of pairs and duplicate them

Adding a floor: I also want the bird to die when it’s outside the room. I could use the outside room event for this, but I already have the logic setup for the pipes, so may as well have a big pipe placed below the room

Then when we test the game, we should see it restart whenever the bird hits a wall