1 00:00:00,330 --> 00:00:01,200 In the last lesson, 2 00:00:01,260 --> 00:00:05,640 we figured out how to detect when our turtle reaches the other side of the 3 00:00:05,640 --> 00:00:08,340 screen. And when this happens, 4 00:00:08,370 --> 00:00:12,480 we return the turtle player to its original position 5 00:00:12,990 --> 00:00:17,990 and we also increase the speed of the cars by the move increment that we 6 00:00:18,690 --> 00:00:22,500 defined as a constant. So in this lesson, 7 00:00:22,560 --> 00:00:24,720 what we're going to do is the final step, 8 00:00:24,750 --> 00:00:29,750 which is to create a scoreboard that keeps track of which level the turtle 9 00:00:30,690 --> 00:00:35,190 player is on, and also when the turtle hits one of the 10 00:00:35,190 --> 00:00:36,720 cars to display 11 00:00:36,750 --> 00:00:40,680 the words game over in the center of the screen. To do that, 12 00:00:40,710 --> 00:00:45,210 we're of course going to go inside our scoreboard class and again 13 00:00:45,240 --> 00:00:48,240 we're going to need the help of the turtle class. 14 00:00:48,660 --> 00:00:53,660 So let's import that from the turtle module and I'm going to make my scoreboard 15 00:00:54,210 --> 00:00:57,300 a subclass of the turtle class. 16 00:00:57,600 --> 00:01:00,270 So it's now inheriting from the turtle class. 17 00:01:00,720 --> 00:01:04,950 And once we've defined our init and managed to get it 18 00:01:04,950 --> 00:01:07,470 to inherit everything from the superclass, 19 00:01:07,860 --> 00:01:12,720 then our scoreboard is now able to do everything a turtle class can do. 20 00:01:13,710 --> 00:01:15,510 What do we want it to do? Well, 21 00:01:15,570 --> 00:01:19,950 we have to initialize it with a couple of things first. For example, 22 00:01:19,950 --> 00:01:22,650 we probably want to start out by hiding the turtle, 23 00:01:22,680 --> 00:01:27,000 we just want to use it as a pen to draw. And in addition, 24 00:01:27,030 --> 00:01:31,590 we don't want it to move and draw. So we're going to pull the pen up. 25 00:01:32,040 --> 00:01:35,250 We're going to be using the write method instead. 26 00:01:35,880 --> 00:01:38,940 And what we want to write is the level, right? 27 00:01:39,300 --> 00:01:43,620 So the current level that the player is on. In order to do that, 28 00:01:43,620 --> 00:01:46,230 we also have to keep track of the level. 29 00:01:46,650 --> 00:01:49,440 So let's go ahead and create a new attribute 30 00:01:49,710 --> 00:01:52,980 which I'll call level and let's start at level 1. 31 00:01:53,700 --> 00:01:58,320 So then we can insert this right here with self.level 32 00:01:59,010 --> 00:02:01,710 and in addition to writing this text, 33 00:02:01,950 --> 00:02:04,950 we can define what we want the alignment to be. 34 00:02:05,370 --> 00:02:10,370 So I want this to be on the left and also what the font to be. 35 00:02:10,919 --> 00:02:15,920 So I'm going to use this font that was declared up here as a constant. Now, 36 00:02:17,070 --> 00:02:22,070 inside our main.py next to where we've defined our player and our car_ 37 00:02:22,070 --> 00:02:22,903 manager 38 00:02:22,920 --> 00:02:27,920 I'm going to create this new scoreboard object and that's going to be created 39 00:02:29,040 --> 00:02:33,870 from the scoreboard class. Now notice when I run the code as it is, 40 00:02:34,230 --> 00:02:37,890 you can see that our level is left-aligned, 41 00:02:38,280 --> 00:02:42,300 it's got the font that we defined and it's writing the text that we want, 42 00:02:42,630 --> 00:02:46,800 but it's not in the right position. To define the position 43 00:02:46,830 --> 00:02:51,750 we have to do that right before we tell the scoreboard to write, 44 00:02:52,110 --> 00:02:55,950 so right here, but after where we've got our penup. 45 00:02:56,580 --> 00:02:59,830 So this way we don't draw a path to where we're going to. 46 00:03:00,400 --> 00:03:03,220 So now we're going to define self.goto, 47 00:03:03,730 --> 00:03:07,870 and I'm just going to get it to go to probably the top left corner. 48 00:03:08,200 --> 00:03:13,200 So that's going to be probably -280 and then it's going to be 49 00:03:14,560 --> 00:03:18,640 +280 on the Y. Now, if we just check the positioning, 50 00:03:18,910 --> 00:03:22,630 you can see that it's a little bit too far up on the Y-axis. 51 00:03:22,990 --> 00:03:27,940 So it lets move it down a little bit and you can tweak these things until you 52 00:03:27,940 --> 00:03:30,670 get to the point where you're happy with its positioning. 53 00:03:31,300 --> 00:03:34,900 So I think this looks pretty good. Now, 54 00:03:34,930 --> 00:03:37,540 in addition to writing the level, 55 00:03:37,570 --> 00:03:41,710 we actually have to update it every time the player levels up, right? 56 00:03:42,220 --> 00:03:45,340 And they do that when there's a successful crossing. 57 00:03:45,850 --> 00:03:47,500 So at some point here, 58 00:03:47,500 --> 00:03:51,550 we should be able to call scoreboard and we should be able to get the scoreboard 59 00:03:51,610 --> 00:03:53,830 to increase the level. 60 00:03:54,550 --> 00:03:59,440 So let's go into scoreboard and let's define that function, increase_ 61 00:04:01,000 --> 00:04:01,833 level. 62 00:04:02,410 --> 00:04:07,410 And the first thing to do when we're increasing the level is of course getting 63 00:04:07,420 --> 00:04:12,420 hold of this self.level and then adding one to it each time. 64 00:04:13,420 --> 00:04:17,529 In addition, we're going to need the level to be rewritten again. 65 00:04:17,980 --> 00:04:22,980 So let's cut this out of the init and let's instead define a custom method 66 00:04:23,260 --> 00:04:25,750 which we'll call update_scoreboard. 67 00:04:28,140 --> 00:04:28,410 Yeah. 68 00:04:28,410 --> 00:04:33,300 Inside this update_scoreboard, we can write the current level. 69 00:04:33,930 --> 00:04:35,460 So now inside the init 70 00:04:35,490 --> 00:04:39,180 we can call self.update_scoreboard 71 00:04:39,570 --> 00:04:41,820 and also when we increase the level, 72 00:04:41,850 --> 00:04:45,030 we can call self.update_scoreboard. 73 00:04:45,780 --> 00:04:47,790 Now at the moment, as it is, 74 00:04:47,940 --> 00:04:52,140 it's going to overwrite what used to be on the scoreboard. 75 00:04:52,620 --> 00:04:55,110 So at the moment it's on level 1, 76 00:04:56,130 --> 00:04:58,800 but once I make a successful crossing, 77 00:04:59,070 --> 00:05:03,240 you can see that level 2 is going to be overwritten over level 1. 78 00:05:03,870 --> 00:05:06,510 To prevent that when we update the scoreboard, 79 00:05:06,780 --> 00:05:09,600 we have to get the scoreboard to clear itself 80 00:05:09,840 --> 00:05:13,740 so that it deletes all the previous stuff that it wrote. This way 81 00:05:13,830 --> 00:05:15,690 when we actually run our code 82 00:05:15,720 --> 00:05:20,720 you can see that our scoreboard will refresh and clear the previous text and 83 00:05:22,890 --> 00:05:24,690 write the new text each time. 84 00:05:25,500 --> 00:05:30,500 So now the final thing to do is to write the words game over in the middle of 85 00:05:30,510 --> 00:05:35,430 the screen when the game ends. To do that, I'm going to create 86 00:05:35,440 --> 00:05:36,900 another method here 87 00:05:36,930 --> 00:05:41,460 which I'll call game_over. And inside this method, 88 00:05:41,790 --> 00:05:45,300 we're going to get our turtle to go to the center. 89 00:05:45,360 --> 00:05:50,360 So we're going to say self.goto and the center is, of course, at 90 00:05:51,120 --> 00:05:54,900 (0, 0), and then we're going to get it to write, 91 00:05:55,320 --> 00:06:00,140 but this time we're not going to write the level anymore. Instead, 92 00:06:00,170 --> 00:06:04,370 we're going to just write the words GAME OVER in all caps. 93 00:06:04,820 --> 00:06:09,820 And I want the alignment to be centered and I want the font to be the default 94 00:06:09,890 --> 00:06:14,690 font. Now, when we actually detect a collision, 95 00:06:14,780 --> 00:06:17,300 not only is game_is_on going to be false, 96 00:06:17,570 --> 00:06:21,950 but also we're going to get the scoreboard to show the game over sequence. 97 00:06:22,670 --> 00:06:27,670 So now we can run our code and you can see that when my turtle collides with a 98 00:06:28,730 --> 00:06:29,563 car, 99 00:06:31,010 --> 00:06:33,740 then it says game over in the center. 100 00:06:34,220 --> 00:06:39,050 And because when we wrote game over, we didn't clear any of the previous texts, 101 00:06:39,350 --> 00:06:42,650 the user can see at the highest level that they managed to reach. 102 00:06:43,730 --> 00:06:45,830 That's it. That's the entire game. 103 00:06:46,370 --> 00:06:50,870 Hopefully you've managed to build this entire game by yourself and you're just here 104 00:06:50,870 --> 00:06:55,610 to check a few niggling issues. But if you struggled with this code, 105 00:06:55,850 --> 00:07:00,290 then I really recommend to review the previous lessons where we created the 106 00:07:00,290 --> 00:07:03,110 snake game or when we created this turtle crossing game 107 00:07:03,440 --> 00:07:07,310 and try to see if you can create these two games from scratch by yourself 108 00:07:07,670 --> 00:07:11,870 by looking at how the game works. Because if you continue forward, 109 00:07:11,930 --> 00:07:14,120 things are only gonna get more complex. 110 00:07:14,420 --> 00:07:18,860 And I'm assuming that you're going to take the time to review and revise before 111 00:07:18,860 --> 00:07:19,693 you continue. 112 00:07:20,900 --> 00:07:24,590 So have fun playing with the turtle crossing game and be sure to let me know in 113 00:07:24,590 --> 00:07:29,590 the Q/A what your highest level is that you managed to reach and also 114 00:07:29,810 --> 00:07:32,780 remember to attach a picture or it didn't happen. 115 00:07:33,740 --> 00:07:36,590 And this is a great project for you to customize. 116 00:07:36,620 --> 00:07:39,110 So think about what you might want to change 117 00:07:39,140 --> 00:07:44,140 like the colors or the shapes and make the game really your own and then take a 118 00:07:44,780 --> 00:07:48,830 screenshot of it and share it with us in the Q/A so that we can all 119 00:07:48,830 --> 00:07:51,500 appreciate and congratulate you on your work.