4.03 Gain points or lose lives
Now you’re going to add some dots that the player needs to collect.
Create a new sprite called ‘red’. This sprite should be a small red dot.
Add this script to your ‘red’ sprite to create a new clone of the sprite every few seconds:
If you click the green flag now, it looks like nothing is happening. This is because all of the cloned sprites are hidden, and they appear in the same place.
You are going to add code to make each new clone appear in one of the four corners of the Stage.
Create a new list called start positions, click the list’s (+) icon to add the values -180 and 180.
- Click on Make a List under Variables.
- Type in the name of your list. You can choose whether you would like your list to be available to all sprites, or to only a specific sprite. Click OK.
- Once you have created the list, it will be displayed on the stage, or you can untick the list in the Scripts tab to hide it.
- Click the
+at the bottom of the list to add items, and click the cross next to an item to delete it.
- New blocks will appear and allow you to use your new list in your project.
Then you can hide the list by unselecting this box:
Notice that the coordinate for each corner of the Stage is a combination of 180 and -180. This means you can use the list to pick a corner of the Stage at random.
Add this code to the ‘dot’ sprite to make each new sprite clone appear in a random corner and then slowly move towards the controller sprite.
This new code chooses either -180180
Test your project. You should see red dots appear in the corners of the Stage and move slowly towards the controller.
Create two new variables called lives and score.
Add code to your Stage to set the lives 3 and the score0 at the start of the game.
Add this code to the end of the Stage’s script to make the game end when the player loses the last of the lives:
The player should win points for catching dots, and should lose lives for failing to catch dots. A dot can only be caught by matching the colour of the controller to the colour of the dot.
Go back to the ‘red’ dot sprite’s Scripts area to add some code blocks to the end of the sprite’s when I start as a clone script.
First, make the dot clone move 5 steps so that it overlaps the controller.
Then add code to either add 1 to score if the colour of the dot clone matches the colour of the controller when they touch, or to take 1 away from lives if their colours don’t match.
- Select the sprite you want to add the sound to.
- Click the Sounds tab, and click Choose a Sound:
- Sounds are organised by category, and you can hover over the icon to hear a sound. Choose a suitable sound.
- You should then see that your sprite has your chosen sound.
Test your game to make sure that:
- You lose a life if you don’t match a dot with the correct colour
- You score a point if you match a dot correctly