title
Coding Challenge #10.1: Maze Generator with p5.js - Part 1
description
Choo choo! In this multi-part coding challenge, I create a maze generator using a depth-first search algorithm with recursive backtracking. The idea is to walk through a grid of cells, removing walls as we go to build a maze. Code: https://thecodingtrain.com/challenges/10-dfs-maze-generator
đšī¸ p5.js Web Editor Sketch: https://editor.p5js.org/codingtrain/sketches/EBkm4txSA
Other Parts of this Challenge:
đē Part 2: Visiting Neighboring Cells: https://youtu.be/D8UgRyRnvXU
đē Part 3: Removing Walls: https://youtu.be/8Ju_uxJ9v44
đē Part 4: Backtracking: https://youtu.be/_p5IH0L63wo
đĨ Previous video: https://youtu.be/FGAwi7wpU8c?list=PLRqwX-V7Uu6ZiZxtDDRCi6uhfTH4FilpH
đĨ Next video: https://youtu.be/IKB1hWWedMk?list=PLRqwX-V7Uu6ZiZxtDDRCi6uhfTH4FilpH
đĨ All videos: https://www.youtube.com/playlist?list=PLRqwX-V7Uu6ZiZxtDDRCi6uhfTH4FilpH
References:
đ Maze Generation Algorithm: https://en.wikipedia.org/wiki/Maze_generation_algorithm#Randomized_depth-first_search
Videos:
đ´ Live Stream Archive: https://youtu.be/nF7DVmovWr0?t=4796s
Related Coding Challenges:
đ #51 A* Pathfinding Algorithm: https://youtu.be/aKYlikFAV4k
đ #76 10Print: https://youtu.be/bEyTZ5ZZxZs
đ #171 Wave Function Collapse: https://youtu.be/rI_y2GAlQFM
Timestamps:
00:00 Introduction
01:15 What are we Building?
03:18 Create a Grid of Cells
08:10 Draw the 4 Walls Separately
11:03 The Anal Retentive Coder
12:30 Store the State of Walls for each Cell
15:07 Recap, See You in Part 2!
Editing by Mathieu Blanchette
Animations by Jason Heglund
Music from Epidemic Sound
đ Website: http://thecodingtrain.com/
đž Share Your Creation! https://thecodingtrain.com/guides/passenger-showcase-guide
đŠ Suggest Topics: https://github.com/CodingTrain/Suggestion-Box
đĄ GitHub: https://github.com/CodingTrain
đŦ Discord: https://discord.gg/hPuGy2g
đ Membership: http://youtube.com/thecodingtrain/join
đ Store: https://standard.tv/codingtrain
đī¸ Twitter: https://twitter.com/thecodingtrain
đ¸ Instagram: https://www.instagram.com/the.coding.train/
đĨ Coding Challenges: https://www.youtube.com/playlist?list=PLRqwX-V7Uu6ZiZxtDDRCi6uhfTH4FilpH
đĨ Intro to Programming: https://www.youtube.com/playlist?list=PLRqwX-V7Uu6Zy51Q-x9tMWIv9cueOFTFA
đ p5.js: https://p5js.org
đ p5.js Web Editor: https://editor.p5js.org/
đ Processing: https://processing.org
đ Code of Conduct: https://github.com/CodingTrain/Code-of-Conduct
This description was auto-generated. If you see a problem, please open an issue: https://github.com/CodingTrain/thecodingtrain.com/issues/new
#maze #recursion #backtracking #depthfirstsearch #p5js #javascript
detail
{'title': 'Coding Challenge #10.1: Maze Generator with p5.js - Part 1', 'heatmap': [{'end': 493.693, 'start': 455.58, 'weight': 1}], 'summary': 'Tutorial series covers building a maze generator using depth-first search and recursive backtracker, implementing the algorithm using html5 canvas and p5.js. it discusses creating cell objects for a grid, including their position and wall status, and the creation of 100 cell objects in a 10x10 grid using javascript, with a focus on constructor functions and nested loops. it also focuses on drawing individual lines to represent walls in cells, discussing the coordinates and the process of drawing the walls, with an emphasis on precision and alignment. additionally, it covers the significance of coding indentation and the creation of boolean variables for representing walls in a grid, along with the process of initializing and memorizing their values, demonstrating setting up a grid, a two-dimensional array with cells, and an array of booleans for the maze creation algorithm.', 'chapters': [{'end': 145.258, 'segs': [{'end': 29.215, 'src': 'embed', 'start': 1.192, 'weight': 1, 'content': [{'end': 4.174, 'text': 'Welcome to a new coding challenge, maze generation.', 'start': 1.192, 'duration': 2.982}, {'end': 6.857, 'text': "So I've got a maze generator running behind me.", 'start': 4.375, 'duration': 2.482}, {'end': 11.66, 'text': "It's using something called a depth first search and a recursive backtracker.", 'start': 7.257, 'duration': 4.403}, {'end': 13.842, 'text': 'Those are all very fancy sounding names.', 'start': 11.721, 'duration': 2.121}, {'end': 16.805, 'text': "And what I'm going to do in this challenge probably in multiple parts,", 'start': 13.902, 'duration': 2.903}, {'end': 22.249, 'text': "so it'll be two or three videos you can follow along in sequence is build this simulation entirely from scratch.", 'start': 16.805, 'duration': 5.444}, {'end': 29.215, 'text': 'And it will cover a lot of concepts in object-oriented programming, thinking about arrays, thinking about something called a stack.', 'start': 22.529, 'duration': 6.686}], 'summary': 'Creating a maze generator using depth first search and recursive backtracker, covering object-oriented programming and stack concepts.', 'duration': 28.023, 'max_score': 1.192, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/HyK_Q5rrcr4/pics/HyK_Q5rrcr41192.jpg'}, {'end': 68.703, 'src': 'embed', 'start': 37.801, 'weight': 2, 'content': [{'end': 39.502, 'text': 'Ah, no, actually, there is some ado here.', 'start': 37.801, 'duration': 1.701}, {'end': 45.167, 'text': 'So this is a version of it running that I built a while ago, meaning earlier this morning.', 'start': 39.963, 'duration': 5.204}, {'end': 47.028, 'text': 'And I just want to show you where this comes from.', 'start': 45.547, 'duration': 1.481}, {'end': 49.33, 'text': 'All this will be linked to the source code for this.', 'start': 47.368, 'duration': 1.962}, {'end': 52.172, 'text': 'And this Wikipedia page will be linked to in the description.', 'start': 49.67, 'duration': 2.502}, {'end': 54.673, 'text': 'This is a Wikipedia page on maze generation.', 'start': 52.692, 'duration': 1.981}, {'end': 56.074, 'text': "There's a lot of different algorithms.", 'start': 54.693, 'duration': 1.381}, {'end': 59.356, 'text': "If I were to just keep scrolling, I'm implementing this depth-first search.", 'start': 56.134, 'duration': 3.222}, {'end': 65.801, 'text': "And I'm actually going to implement exactly this pseudocode, which is written right here under a recursive backtracker.", 'start': 59.637, 'duration': 6.164}, {'end': 68.703, 'text': "But if you keep scrolling down, you'll see there's various other algorithms.", 'start': 65.841, 'duration': 2.862}], 'summary': 'The transcript discusses a version of a maze generation algorithm, with a focus on implementing depth-first search and recursive backtracker.', 'duration': 30.902, 'max_score': 37.801, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/HyK_Q5rrcr4/pics/HyK_Q5rrcr437801.jpg'}, {'end': 124.072, 'src': 'embed', 'start': 92.798, 'weight': 0, 'content': [{'end': 96.221, 'text': "And I'm also using Atom as my text editor, some tools that I'm using here.", 'start': 92.798, 'duration': 3.423}, {'end': 103.766, 'text': 'But what I ultimately need is I need to think of this canvas as a grid.', 'start': 96.881, 'duration': 6.885}, {'end': 109.295, 'text': 'And each spot on that grid is a cell object.', 'start': 104.611, 'duration': 4.684}, {'end': 121.792, 'text': "And essentially, what the program is going to do is it's going to figure out what walls should be removed to make a nice maze pattern.", 'start': 109.735, 'duration': 12.057}, {'end': 124.072, 'text': "And you can sort of see what I'm doing here.", 'start': 121.872, 'duration': 2.2}], 'summary': 'Using atom as text editor, creating maze pattern by removing walls on a grid.', 'duration': 31.274, 'max_score': 92.798, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/HyK_Q5rrcr4/pics/HyK_Q5rrcr492798.jpg'}], 'start': 1.192, 'title': 'Maze generation challenge', 'summary': 'Covers building a maze generator using depth-first search and recursive backtracker, focusing on object-oriented programming, arrays, stacks, and recursion. it plans to implement the algorithm using html5 canvas and p5.js.', 'chapters': [{'end': 145.258, 'start': 1.192, 'title': 'Maze generation challenge', 'summary': 'Covers the process of building a maze generator using depth-first search and recursive backtracker, focusing on object-oriented programming, arrays, stacks, and recursion, and plans to implement the algorithm using html5 canvas and p5.js.', 'duration': 144.066, 'highlights': ['The challenge involves building a maze generator using depth-first search and recursive backtracker, covering various concepts in object-oriented programming, arrays, stacks, and recursion. The challenge involves building a maze generator using depth-first search and recursive backtracker, covering various concepts in object-oriented programming, arrays, stacks, and recursion.', 'The maze generator will be implemented using HTML5 canvas and p5.js, with a focus on creating a grid of cell objects and determining which walls to remove to form a continuous maze pattern. The maze generator will be implemented using HTML5 canvas and p5.js, with a focus on creating a grid of cell objects and determining which walls to remove to form a continuous maze pattern.', 'The source code for the maze generator will be linked, along with a Wikipedia page on maze generation and various algorithms, including the depth-first search and recursive backtracker. The source code for the maze generator will be linked, along with a Wikipedia page on maze generation and various algorithms, including the depth-first search and recursive backtracker.']}], 'duration': 144.066, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/HyK_Q5rrcr4/pics/HyK_Q5rrcr41192.jpg', 'highlights': ['The maze generator will be implemented using HTML5 canvas and p5.js, with a focus on creating a grid of cell objects and determining which walls to remove to form a continuous maze pattern.', 'The challenge involves building a maze generator using depth-first search and recursive backtracker, covering various concepts in object-oriented programming, arrays, stacks, and recursion.', 'The source code for the maze generator will be linked, along with a Wikipedia page on maze generation and various algorithms, including the depth-first search and recursive backtracker.']}, {'end': 387.545, 'segs': [{'end': 173.479, 'src': 'embed', 'start': 145.658, 'weight': 1, 'content': [{'end': 148.04, 'text': 'So what I need is a cell object.', 'start': 145.658, 'duration': 2.382}, {'end': 151.203, 'text': 'The cell object should know where it is in this grid.', 'start': 148.3, 'duration': 2.903}, {'end': 154.065, 'text': "It should know what column it's in and what row it's in.", 'start': 151.223, 'duration': 2.842}, {'end': 161.651, 'text': 'So every one of these spots has a column number, 0, 1, 2, 3, or 4, and a row number, 0, 1, 2, or 3.', 'start': 154.345, 'duration': 7.306}, {'end': 163.133, 'text': 'So the cell needs to know where it is.', 'start': 161.651, 'duration': 1.482}, {'end': 166.616, 'text': "And it also needs to know what's the deal with its walls.", 'start': 163.153, 'duration': 3.463}, {'end': 169.097, 'text': 'Does it have?', 'start': 167.796, 'duration': 1.301}, {'end': 171.738, 'text': 'is the wall to the right open or closed??', 'start': 169.097, 'duration': 2.641}, {'end': 173.479, 'text': 'Is the wall to the top open or closed??', 'start': 171.858, 'duration': 1.621}], 'summary': 'Create a cell object with grid position and wall status.', 'duration': 27.821, 'max_score': 145.658, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/HyK_Q5rrcr4/pics/HyK_Q5rrcr4145658.jpg'}, {'end': 377.277, 'src': 'embed', 'start': 353.809, 'weight': 0, 'content': [{'end': 361.374, 'text': "That's going to make 100 cell objects right, 10 by 10 grid, Every for every out call of every row.", 'start': 353.809, 'duration': 7.565}, {'end': 362.554, 'text': 'make 100 cell objects.', 'start': 361.374, 'duration': 1.18}, {'end': 364.436, 'text': 'make that each know where they are.', 'start': 362.554, 'duration': 1.882}, {'end': 365.797, 'text': 'now, Where do I put those?', 'start': 364.436, 'duration': 1.361}, {'end': 367.958, 'text': 'what I want, what I need, is an array.', 'start': 365.797, 'duration': 2.161}, {'end': 372.513, 'text': 'So I need an array And I could use a two-dimensional array.', 'start': 367.958, 'duration': 4.555}, {'end': 377.277, 'text': "And two-dimensional arrays in JavaScript, first of all, there's not really any such thing as a two-dimensional array.", 'start': 372.593, 'duration': 4.684}], 'summary': 'Creating 100 cell objects in a 10x10 grid using a two-dimensional array in javascript.', 'duration': 23.468, 'max_score': 353.809, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/HyK_Q5rrcr4/pics/HyK_Q5rrcr4353809.jpg'}], 'start': 145.658, 'title': 'Creating cell objects and grid in javascript', 'summary': 'Discusses creating cell objects for a grid, including their position and wall status, and the creation of 100 cell objects in a 10x10 grid using javascript, with a focus on constructor functions and nested loops.', 'chapters': [{'end': 216.331, 'start': 145.658, 'title': 'Creating cell object for grid', 'summary': 'Discusses the creation of a cell object that is aware of its position in a grid, including column and row numbers, and the status of its surrounding walls, with a focus on building a constructor function for the cell object.', 'duration': 70.673, 'highlights': ['The cell object needs to know its position in the grid, including column number (0-4) and row number (0-3).', 'The cell object also needs to be aware of the status of its surrounding walls, including whether the walls to the right, top, left, and bottom are open or closed.', 'The focus of the chapter is on building a constructor function for the cell object to fulfill the specified requirements.']}, {'end': 387.545, 'start': 216.571, 'title': 'Creating cell objects and array in javascript', 'summary': 'Discusses creating a cell object with i and j representing column and row numbers, defining global variables for columns, rows, and size, and using a nested loop to create 100 cell objects in a 10x10 grid.', 'duration': 170.974, 'highlights': ['The chapter discusses creating a cell object with i and j representing column and row numbers, defining global variables for columns, rows, and size, and using a nested loop to create 100 cell objects in a 10x10 grid.', 'The width and height of each square are 40, resulting in 10 columns and 10 rows in a 400x400 canvas.', 'The chapter explains the use of a nested loop to create 100 cell objects, each representing a square in a 10x10 grid.', 'The chapter discusses the use of a one-dimensional array to store the 100 cell objects.']}], 'duration': 241.887, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/HyK_Q5rrcr4/pics/HyK_Q5rrcr4145658.jpg', 'highlights': ['The chapter discusses the use of a nested loop to create 100 cell objects, each representing a square in a 10x10 grid.', 'The cell object needs to know its position in the grid, including column number (0-4) and row number (0-3).', 'The cell object also needs to be aware of the status of its surrounding walls, including whether the walls to the right, top, left, and bottom are open or closed.', 'The chapter explains the use of a nested loop to create 100 cell objects in a 10x10 grid.']}, {'end': 737.874, 'segs': [{'end': 419.339, 'src': 'embed', 'start': 387.605, 'weight': 0, 'content': [{'end': 390.528, 'text': "And we'll talk about why and see some pieces of that as I keep going.", 'start': 387.605, 'duration': 2.923}, {'end': 392.349, 'text': 'So I have a one-dimensional array.', 'start': 391.128, 'duration': 1.221}, {'end': 394.852, 'text': 'This list is going to store all the cell objects.', 'start': 392.49, 'duration': 2.362}, {'end': 397.915, 'text': "And I'm going to say grid.push cell.", 'start': 395.552, 'duration': 2.363}, {'end': 403.982, 'text': "So all I'm doing here is I'm saying make all of these cell objects and put them into this big array.", 'start': 398.395, 'duration': 5.587}, {'end': 415.596, 'text': 'Once I have that, in draw, I could actually then loop through all of them.', 'start': 404.563, 'duration': 11.033}, {'end': 419.339, 'text': 'and display them.', 'start': 418.559, 'duration': 0.78}], 'summary': 'Creating a one-dimensional array to store cell objects and display them in draw.', 'duration': 31.734, 'max_score': 387.605, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/HyK_Q5rrcr4/pics/HyK_Q5rrcr4387605.jpg'}, {'end': 514.667, 'src': 'heatmap', 'start': 455.58, 'weight': 2, 'content': [{'end': 468.93, 'text': 'X is this.j times w and then so I could just draw a rectangle at x, y, at that size, and I could say stroke 255, no fill.', 'start': 455.58, 'duration': 13.35}, {'end': 472.652, 'text': 'and now, if I run this, we should see ah, okay, so what did I miss?', 'start': 468.93, 'duration': 3.722}, {'end': 474.974, 'text': 'Cells is not defined.', 'start': 473.233, 'duration': 1.741}, {'end': 478.516, 'text': 'sketch.js line 25..', 'start': 474.974, 'duration': 3.542}, {'end': 481.562, 'text': 'Okay, so the array, I called it grid, not cells.', 'start': 478.516, 'duration': 3.046}, {'end': 486.131, 'text': 'Whoops, I wonder why grid is, oh, and this should be grid also.', 'start': 482.263, 'duration': 3.868}, {'end': 489.898, 'text': 'Okay, so that should fix that.', 'start': 486.151, 'duration': 3.747}, {'end': 493.693, 'text': 'Great, so you can see now I have that grid there.', 'start': 491.291, 'duration': 2.402}, {'end': 502.178, 'text': 'Now, we should dig a little bit deeper here because the whole point of doing this was not to draw rectangles here, but each cell has walls.', 'start': 494.033, 'duration': 8.145}, {'end': 506.381, 'text': 'It has four walls, a top, a right, a bottom, and a left.', 'start': 502.298, 'duration': 4.083}, {'end': 510.984, 'text': "So I should be either drawing, the wall should either be there or they shouldn't be there.", 'start': 506.701, 'duration': 4.283}, {'end': 512.825, 'text': 'So I need to draw them as individual lines.', 'start': 511.024, 'duration': 1.801}, {'end': 514.667, 'text': "So let's figure out how I would do that.", 'start': 513.126, 'duration': 1.541}], 'summary': "Rectangles drawn at x, y with stroke 255. fixed 'cells' error. now drawing individual lines for walls.", 'duration': 45.737, 'max_score': 455.58, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/HyK_Q5rrcr4/pics/HyK_Q5rrcr4455580.jpg'}, {'end': 699.043, 'src': 'embed', 'start': 671.029, 'weight': 4, 'content': [{'end': 678.411, 'text': 'where the garbage goes in the Ziploc bag and then the Ziploc bag goes in the paper bag and the paper bag gets folded and gets taped?', 'start': 671.029, 'duration': 7.382}, {'end': 680.472, 'text': 'Well, I am the anal retentive coder.', 'start': 678.811, 'duration': 1.661}, {'end': 687.495, 'text': 'And what I want to do is just align all of this so I can see this more easily.', 'start': 680.772, 'duration': 6.723}, {'end': 689.716, 'text': "What's going on?", 'start': 688.895, 'duration': 0.821}, {'end': 693.419, 'text': 'And this is bothering me because I want spaces here.', 'start': 691.137, 'duration': 2.282}, {'end': 699.043, 'text': "So you should, you should now turn this video to two times speed while I'm doing this and then go back.", 'start': 693.419, 'duration': 5.624}], 'summary': 'Anal retentive coder wants to align items for better visibility.', 'duration': 28.014, 'max_score': 671.029, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/HyK_Q5rrcr4/pics/HyK_Q5rrcr4671029.jpg'}], 'start': 387.605, 'title': 'Creating and displaying a grid of cells and drawing walls in cells', 'summary': 'Discusses creating a one-dimensional array to store cell objects, looping through the array to display the cells, and rectifying a programming error in the grid creation process. it also focuses on drawing individual lines to represent walls in cells, discussing the coordinates and the process of drawing the walls, with an emphasis on precision and alignment.', 'chapters': [{'end': 493.693, 'start': 387.605, 'title': 'Creating and displaying a grid of cells', 'summary': 'Discusses creating a one-dimensional array to store cell objects, looping through the array to display the cells, and rectifying a programming error in the grid creation process.', 'duration': 106.088, 'highlights': ["The chapter emphasizes the process of creating a one-dimensional array to store all the cell objects by using the 'grid.push cell' method.", "It explains the significance of looping through the array in the 'draw' function to display the cell objects.", "It highlights the identification and correction of a programming error where the array 'grid' was mistakenly referred to as 'cells', showcasing the process of debugging and problem-solving in programming."]}, {'end': 737.874, 'start': 494.033, 'title': 'Drawing walls in cells', 'summary': 'Focuses on drawing individual lines to represent walls in cells, discussing the coordinates and the process of drawing the walls, with an emphasis on the need for precision and alignment.', 'duration': 243.841, 'highlights': ['Drawing individual lines to represent walls in cells by using coordinates like x, y, x + w, y, x + w, y + w, and x, y + w, to create top, right, bottom, and left walls respectively. The process involves using specific coordinates to draw individual lines to represent the top, right, bottom, and left walls of each cell.', "Emphasizing the need for precision and alignment in the coding process, comparing the approach to the behavior of an 'anal retentive coder' and expressing a desire for neatly aligned code. The speaker emphasizes the need for precision and alignment in the coding process, comparing their approach to that of an 'anal retentive coder' and expressing a strong desire for neatly aligned code.", 'Expressing the intention to periodically review and align the code for better understanding and visibility, suggesting that the process is useful to provide clarity in the coding. The speaker expresses the intention to periodically review and align the code for better understanding and visibility, suggesting that the process is useful to provide clarity in the coding.']}], 'duration': 350.269, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/HyK_Q5rrcr4/pics/HyK_Q5rrcr4387605.jpg', 'highlights': ["The chapter emphasizes the process of creating a one-dimensional array to store all the cell objects by using the 'grid.push cell' method.", "It explains the significance of looping through the array in the 'draw' function to display the cell objects.", "It highlights the identification and correction of a programming error where the array 'grid' was mistakenly referred to as 'cells', showcasing the process of debugging and problem-solving in programming.", 'Drawing individual lines to represent walls in cells by using coordinates like x, y, x + w, y, x + w, y + w, and x, y + w, to create top, right, bottom, and left walls respectively.', "Emphasizing the need for precision and alignment in the coding process, comparing the approach to the behavior of an 'anal retentive coder' and expressing a desire for neatly aligned code.", 'Expressing the intention to periodically review and align the code for better understanding and visibility, suggesting that the process is useful to provide clarity in the coding.']}, {'end': 963.682, 'segs': [{'end': 776.808, 'src': 'embed', 'start': 737.894, 'weight': 0, 'content': [{'end': 741.816, 'text': 'You know, indentation is important, but at some point in your life, you just need to like write your code.', 'start': 737.894, 'duration': 3.922}, {'end': 748.139, 'text': 'Anyway, the reason why I did this is I want to see like, okay, I want to see clearly like this is the x coordinate, this is the y, this is the x.', 'start': 741.896, 'duration': 6.243}, {'end': 749.44, 'text': 'I wanted everything to line up nicely.', 'start': 748.139, 'duration': 1.301}, {'end': 754.923, 'text': 'Okay, now, how am I going to figure out a way, I need something else for these cells.', 'start': 749.9, 'duration': 5.023}, {'end': 763.387, 'text': "I need to figure out a way to know, does it have a wall on any of these sides? So what I'm going to do, this is going to be a little bit strange.", 'start': 755.863, 'duration': 7.524}, {'end': 766.269, 'text': 'I think a way of doing this is to create Boolean variables.', 'start': 763.407, 'duration': 2.862}, {'end': 769.351, 'text': 'So I have a Boolean variable for the top.', 'start': 766.629, 'duration': 2.722}, {'end': 774.447, 'text': 'for the right, for the bottom, and for the left.', 'start': 770.285, 'duration': 4.162}, {'end': 776.808, 'text': 'Top right, bottom left.', 'start': 775.147, 'duration': 1.661}], 'summary': 'The speaker discusses the importance of code structure and creating boolean variables for cell walls.', 'duration': 38.914, 'max_score': 737.894, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/HyK_Q5rrcr4/pics/HyK_Q5rrcr4737894.jpg'}, {'end': 925.651, 'src': 'embed', 'start': 898.876, 'weight': 3, 'content': [{'end': 904.979, 'text': "so you can see, at some point I'm going to be able to change these Boolean variables from true or false, to add and remove walls,", 'start': 898.876, 'duration': 6.103}, {'end': 907.08, 'text': 'based on how that labyrinth should look.', 'start': 904.979, 'duration': 2.101}, {'end': 916.225, 'text': "okay?. So I think I've actually, this concludes this first video, where essentially all I've done is set up a grid, a two-dimensional array.", 'start': 907.08, 'duration': 9.145}, {'end': 925.651, 'text': "It's a one-dimensional array and it has a bunch of cells that live on a grid, each with an I and a J.", 'start': 917.625, 'duration': 8.026}], 'summary': 'The transcript discusses changing boolean variables to manipulate a two-dimensional array grid for creating a labyrinth.', 'duration': 26.775, 'max_score': 898.876, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/HyK_Q5rrcr4/pics/HyK_Q5rrcr4898876.jpg'}], 'start': 737.894, 'title': 'Coding indentation and maze creation algorithm', 'summary': 'Covers the significance of coding indentation and the creation of boolean variables for representing walls in a grid, along with the process of initializing and memorizing their values. it also demonstrates setting up a grid, a two-dimensional array with cells, and an array of booleans for the maze creation algorithm.', 'chapters': [{'end': 825.738, 'start': 737.894, 'title': 'Coding indentation and boolean variables', 'summary': 'Discusses the importance of coding indentation, the creation of boolean variables to represent walls in a grid, and the process of initializing and memorizing the values for these variables in a coding example.', 'duration': 87.844, 'highlights': ['The importance of coding indentation is emphasized in the chapter, highlighting the need to write code despite the focus on indentation.', 'The creation of Boolean variables to represent walls in a grid is described, with a focus on assigning true values to each wall (top, right, bottom, left) and the significance of memorizing the order of these walls.', 'The process of initializing and memorizing the values for Boolean variables representing walls is detailed, focusing on the specific order (top, right, bottom, left) and the importance of memorization for future reference.']}, {'end': 963.682, 'start': 825.958, 'title': 'Maze creation algorithm', 'summary': 'Demonstrates setting up a grid, a two-dimensional array with cells, and an array of booleans to determine the presence of surrounding lines, preparing for the maze creation algorithm.', 'duration': 137.724, 'highlights': ['The chapter demonstrates setting up a grid, a two-dimensional array with cells, and an array of booleans to determine the presence of surrounding lines, preparing for the maze creation algorithm.', 'The speaker explains the process of drawing lines based on the existence of walls, demonstrating the use of boolean variables to add and remove walls to create the labyrinth.', 'The speaker discusses using boolean variables to dynamically add and remove walls, providing a visual demonstration by changing the variables from true to false and observing the impact on the displayed lines.']}], 'duration': 225.788, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/HyK_Q5rrcr4/pics/HyK_Q5rrcr4737894.jpg', 'highlights': ['The process of initializing and memorizing the values for Boolean variables representing walls is detailed, focusing on the specific order (top, right, bottom, left) and the importance of memorization for future reference.', 'The creation of Boolean variables to represent walls in a grid is described, with a focus on assigning true values to each wall (top, right, bottom, left) and the significance of memorizing the order of these walls.', 'The importance of coding indentation is emphasized in the chapter, highlighting the need to write code despite the focus on indentation.', 'The chapter demonstrates setting up a grid, a two-dimensional array with cells, and an array of booleans to determine the presence of surrounding lines, preparing for the maze creation algorithm.']}], 'highlights': ['The maze generator will be implemented using HTML5 canvas and p5.js, with a focus on creating a grid of cell objects and determining which walls to remove to form a continuous maze pattern.', 'The challenge involves building a maze generator using depth-first search and recursive backtracker, covering various concepts in object-oriented programming, arrays, stacks, and recursion.', 'The source code for the maze generator will be linked, along with a Wikipedia page on maze generation and various algorithms, including the depth-first search and recursive backtracker.', 'The chapter discusses the use of a nested loop to create 100 cell objects, each representing a square in a 10x10 grid.', 'The cell object needs to know its position in the grid, including column number (0-4) and row number (0-3).', 'The cell object also needs to be aware of the status of its surrounding walls, including whether the walls to the right, top, left, and bottom are open or closed.', 'The chapter explains the use of a nested loop to create 100 cell objects in a 10x10 grid.', "The chapter emphasizes the process of creating a one-dimensional array to store all the cell objects by using the 'grid.push cell' method.", "It explains the significance of looping through the array in the 'draw' function to display the cell objects.", "It highlights the identification and correction of a programming error where the array 'grid' was mistakenly referred to as 'cells', showcasing the process of debugging and problem-solving in programming.", 'Drawing individual lines to represent walls in cells by using coordinates like x, y, x + w, y, x + w, y + w, and x, y + w, to create top, right, bottom, and left walls respectively.', "Emphasizing the need for precision and alignment in the coding process, comparing the approach to the behavior of an 'anal retentive coder' and expressing a desire for neatly aligned code.", 'Expressing the intention to periodically review and align the code for better understanding and visibility, suggesting that the process is useful to provide clarity in the coding.', 'The process of initializing and memorizing the values for Boolean variables representing walls is detailed, focusing on the specific order (top, right, bottom, left) and the importance of memorization for future reference.', 'The creation of Boolean variables to represent walls in a grid is described, with a focus on assigning true values to each wall (top, right, bottom, left) and the significance of memorizing the order of these walls.', 'The importance of coding indentation is emphasized in the chapter, highlighting the need to write code despite the focus on indentation.', 'The chapter demonstrates setting up a grid, a two-dimensional array with cells, and an array of booleans to determine the presence of surrounding lines, preparing for the maze creation algorithm.']}