WEBVTT 00:00.450 --> 00:06.810 He saw last time that when we printed out tell the world that it printed out in the top left the screen 00:06.810 --> 00:18.000 much like cows outworks we even see the cursor as the outputs of your runs in the world and the cursor 00:18.000 --> 00:20.080 position here. 00:20.190 --> 00:28.920 So far nothing seems all that exciting but the most important part of curses output is that you can 00:28.920 --> 00:33.780 change the cursor position directly unlikes out. 00:33.840 --> 00:39.160 So close this and we say 00:41.560 --> 00:42.600 move 00:45.180 --> 00:50.220 Dean 10 k. 00:50.320 --> 00:56.420 So we move these moves change the cursor position position. 00:56.470 --> 01:03.320 So this changes cursor session. 01:03.470 --> 01:09.140 Initially the cursor position is at the top left of the screen. 01:09.440 --> 01:19.230 So in terms of coordinates the top left corner is at 0 0 and y goes down and X goes to the right. 01:19.580 --> 01:20.960 So we run this 01:26.670 --> 01:35.320 we see that we actually moved our Hello World string down 15. 01:35.370 --> 01:40.210 So this 15 here is actually the Y. 01:40.680 --> 01:49.810 And we moved it 10 over so 15 units down and 10 yards to the right. 01:49.880 --> 01:56.570 One thing to note about move is that the first argument is for the y direction and second argument is 01:56.570 --> 02:05.650 for the ruction love to keep that in mind since usually we think X first then why it's opposite here. 02:05.780 --> 02:15.980 Now whenever we draw we draw relative to the cursor position we just set K and see the new cursor position 02:15.980 --> 02:18.720 now is right here. 02:18.980 --> 02:27.450 So it went down and tend to write in however many characters this is over. 02:28.160 --> 02:32.180 So this makes trying very flexible. 02:32.990 --> 02:39.760 It's a little bit annoying to always call or move first and then call print w. 02:40.050 --> 02:49.280 So curses actually combine them into one nice shorthand function that we can use so instead of always 02:49.280 --> 03:06.110 calling move then branch we can instead do this say this is out you can say in the print you and just 03:06.110 --> 03:15.240 like before we can say 15 years change it 20 and 15 is a low 03:18.600 --> 03:21.420 that you're right and this 03:24.980 --> 03:29.340 C actually went down 20 and over 15. 03:29.930 --> 03:35.900 And so just like the move in print but in one call it makes it really nice. 03:36.340 --> 03:37.940 OK. 03:38.120 --> 03:45.830 So one thing to note about the strings that we're using are here is close this. 03:45.830 --> 03:50.870 So this string is actually not a C++ string. 03:50.870 --> 03:52.160 There are C strings. 03:52.240 --> 03:52.810 OK. 03:52.970 --> 03:57.190 So this is one of the reasons why I try to use the strings first. 03:57.260 --> 04:06.540 So if we're going to use our C++ string say this string is Cloudstreet here 04:09.460 --> 04:16.970 spring so if you want do you have a string. 04:17.510 --> 04:22.780 What do you call easy string variant. 04:23.020 --> 04:25.790 Hello string. 04:26.380 --> 04:29.560 Sorry stirrer. 04:29.790 --> 04:30.850 This. 04:32.590 --> 04:35.260 Nach gay 04:38.750 --> 04:39.270 like so 04:42.800 --> 04:55.040 that again say we wanted to draw in the direct middle of the screen and there are built in variables 04:55.040 --> 05:01.100 and curses that will tell us how many rows and how many columns the window it's OK. 05:01.170 --> 05:14.060 So if we want to directly draw this string in in the middle of the screen we could say this say lines 05:14.810 --> 05:26.940 which is the lines is number rows. 05:27.110 --> 05:30.810 Our day. 05:30.880 --> 05:35.930 And this is a built in variable that curses provides us. 05:35.940 --> 05:47.100 OK so that winds are two in this if you want to know how many columns we say columns this too. 05:47.120 --> 05:56.210 And if you want to be in the middle say hello string length or two 05:59.040 --> 06:01.610 ran this middle. 06:03.190 --> 06:04.170 It's pretty cool. 06:05.370 --> 06:16.940 And you should never set lines or columns directly because they are not really things we should be changing. 06:17.350 --> 06:22.240 So instead we should only ever read from them. 06:22.950 --> 06:30.520 And I want show you one more way we can actually get how many lines and columns window is or how big 06:30.520 --> 06:31.350 the window is. 06:31.350 --> 06:32.660 Right. 06:33.100 --> 06:38.170 And then through another cursus function call get Max x y. 06:38.260 --> 06:47.260 So we need two variables is a window next X is zero. 06:47.300 --> 06:55.140 Sarge window Max why is that zero. 06:56.260 --> 07:04.520 And we'll call a function so call get max y x. 07:05.320 --> 07:17.470 And we'll use this thing called standard screen and Stimme screen is provided to us by after we call 07:17.500 --> 07:18.160 and it's green. 07:18.160 --> 07:22.730 So that's one of the things the screen does is actually give us this kind of is. 07:23.080 --> 07:26.060 This is actually our window that we're drawing. 07:26.250 --> 07:33.370 And analysts say standard screen so we give it the window which is our default window that we're using 07:34.240 --> 07:35.870 and we see a window. 07:36.220 --> 08:01.810 Max why is it always y x x y we know x x K and then we can say window x y to an edge window x x. 08:02.640 --> 08:08.420 And this again c it's still in the middle of the screen. 08:10.210 --> 08:19.150 So there's one other kind of drawing function that we're going to need and that is to draw just a single 08:19.150 --> 08:30.310 character and we can do that by using a function called Ad character. 08:31.020 --> 08:39.730 And this just add a character acts like this or actions stop or. 08:39.860 --> 08:41.360 And if you're just 08:44.080 --> 08:48.350 see that it actually draws the character. 08:48.580 --> 09:00.950 And just like with the print W function there's also the kind of move variant or add character in do 09:00.950 --> 09:04.850 that by saying in the character 09:07.540 --> 09:21.300 15 in the y in tune x influence see that it moved down 15 and 10 to the right way. 09:24.790 --> 09:27.650 The most that still there is this cursor. 09:27.670 --> 09:34.720 It's kind of annoying to see especially if we want a game so you can actually get rid of it by saying 09:35.410 --> 09:47.030 curse and set you set that false actually makes the cursor invisible. 09:47.260 --> 09:49.190 OK so if you were on this 09:57.080 --> 10:02.210 this see that there's no more cursor. 10:02.840 --> 10:04.800 So it's really nice for games. 10:05.840 --> 10:10.350 Says close this and there's one other. 10:10.390 --> 10:19.930 One last thing we did one single need and that is if you remember that we had a clear screen function 10:19.930 --> 10:30.100 before all curses also has a clear spring function and it's called clear that and clear will actually 10:30.100 --> 10:32.530 clear the entire screen. 10:32.560 --> 10:36.840 So if we run this again we should see that 10:40.210 --> 10:46.440 see that nothing more ANCs cleared the actual character that we were drawn. 10:46.780 --> 10:52.230 So that's kind of it for output from you know in the next lecture. 10:52.240 --> 10:54.690 I want to go over some input.