first commit

Author: abdullahau

Diff for: .gitignore

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+/.vscode
+/helsinki_env
+/programming-24-Course-Data
+/rage programming-23 main data.zip
+/rage programming-24 main data.zip
+/test-pending.py
+/test.md
+/test_pygame.py
+/__pycache__

Diff for: 0 - Master Notes.md

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+# Sorting Algorithms
+# A sorting algorithm is a method or a process used to rearrange elements in a list or an array in a 
+# certain order, whether it be ascending, decending, or even based on some complex rules.
+
+# Bubble Sort
+# Bubble sort is a simple sorting algorithm that repeatedly steps through the array, element by element
+# comparing the current element with the one after it, swapping their values if the former is larger than the latter.
+arr = [12, 20, 15, 29, 10, 14]
+
+def bubbleSort(arr):
+    n = len(arr)
+    for i in range(n-1):
+        swapped = False
+        for j in range(n-i-1):
+            if arr[j] > arr[j+1]:
+                arr[j], arr[j+1] = arr[j+1], arr[j]
+                swapped = True
+        if not swapped:
+            break
+
+bubbleSort(arr)
+print(arr)
+
+# Insertion Sort
+# Insertion sort is a simple sorting algorithm that builds the final sorted array one element at a time
+arr = [13, 20, 7, 28, 3, 8]
+
+def insertionSort(arr):
+    for i in range(1, len(arr)):
+        key = arr[i]
+        j = i - 1
+        while j >= 0 and arr[j] > key:
+            arr[j + 1] = arr[j]
+            j -= 1
+        arr[j + 1] = key
+
+insertionSort(arr)
+print(arr)
+
+# Merge Sort
+# Merge sort is an efficient, stable, and comparison-based Divide and Conquer sorting algorithm, and its recursive.
+# It divides the input array into two halves, calls itself for the halves, sorting them and then merges the two sorted halves.
+arr = [39, 45, 45, 29, 50, 48, 41, 18, 14, 22, 27]
+
+def merge_sort(arr):
+    if len(arr) > 1:
+        mid = len(arr) // 2
+        L = arr[:mid]
+        R = arr[mid:]
+        
+        merge_sort(L)
+        merge_sort(R)
+        
+        merge(arr, L, R)
+
+def merge(arr, L, R):
+    i = j = k = 0
+    
+    # Merging the temporary arrays
+    # back into arr[]
+    while i < len(L) and j < len(R):
+        if L[i] < R[j]:
+            arr[k] = L[i]
+            i += 1
+        else:
+            arr[k] = R[j]
+            j += 1
+        k += 1
+    
+    # Copy the remaining elements
+    # of L[], if there are any
+    while i < len(L):
+        arr[k] = L[i]
+        i += 1
+        k += 1
+        
+    # Copy the remaining elements 
+    # of R[], if there are any
+    while j < len(R):
+        arr[k] = R[j]
+        j += 1
+        k += 1
+        
+merge_sort(arr)
+print(arr)
+
+# Other sorting alcorithms:
+# Selection, Shell, Heap, Quick and Quick3
+
+
+# Searching Algorithms
+# A searching algorithm is a method or process used to find or retrieve an element from a data structure.
+# The goal is to find whether an item exists in the data set, and oftentimes to determine its location.
+
+# Linear Search
+# Each element is checked in sequence until you find what you're looking for or the list ends.
+# If the current element equals what we're looking for (x), return it. 
+
+arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]
+
+def linear_search(arr, x):
+    for i in range(len(arr)):
+        if arr[i] == x:
+            return i
+    return -1
+
+print(linear_search(arr, 8))
+arr[linear_search(arr, 8)]
+
+# Binary Search
+# Binary Search works by repeatedly dividing in half the portion of the list that could contain the item, 
+# until you've narrowed down the possible location to just one.
+
+arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]
+
+def binary_search(arr, x):
+    l = 0
+    r = len(arr) - 1
+    while l <= r:
+        mid = l + (r - l) // 2
+        if arr[mid] == x:
+            return mid
+        elif arr[mid] < x:
+            l = mid + 1
+        else:
+            r = mid - 1
+    return -1
+
+print(linear_search(arr, 8))
+arr[linear_search(arr, 8)]
+
+# Binary Search - 2
+
+def binary_search(target: list, item: int, left : int, right : int):
+    """ The function returns True if the item is contained in the target list, False otherwise """
+    # If the search area is empty, item was not found
+    if left > right:
+        return False
+
+    # Calculate the centre of the search area, integer result
+    centre = (left+right)//2
+
+    # If the item is found at the centre, return
+    if target[centre] == item:
+        return True
+
+    # If the item is greater, search the greater half
+    if target[centre] < item:
+        return binary_search(target, item, centre+1, right)
+    # Else the item is smaller, search the smaller half
+    else:
+        return binary_search(target, item, left, centre-1)
+
+target = [1, 2, 4, 5, 7, 8, 11, 13, 14, 18]
+print(binary_search(target, 2, 0, len(target)-1))
+print(binary_search(target, 13, 0, len(target)-1))
+print(binary_search(target, 6, 0, len(target)-1))
+print(binary_search(target, 15, 0, len(target)-1))

Diff for: 1 - Pygame.md

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+"""
+Angles in Pygame
+A demonstration by Max Goldstein, Tufts University '14
+
+In pygame, +y is down. Python's arctangent functions expect +y to be up.
+This wreaks havoc with the unit circle if you want to find the angle between
+two points (for, say, collision detection or aiming a gun). You can avoid the
+problem entirely by calling atan2(-y, x) and adding 2*pi to the result if it's
+negative.
+
+Note that math.atan2(numerator, denominator) does the division for you.
+
+Controls: move the mouse near the axes.
+
+"""
+
+import pygame, sys, os
+from pygame.locals import *
+from math import atan2, degrees, pi
+
+def quit():
+    pygame.quit()
+    sys.exit()
+
+pygame.init()
+screenDimensions = (400, 540)
+window = pygame.display.set_mode(screenDimensions)
+pygame.display.set_caption('Angles in Pygame')
+screen = pygame.display.get_surface() 
+
+clock = pygame.time.Clock()
+FPS = 50
+time_passed = 0
+
+pos = (200, 200)
+origin = (200, 200)
+
+white = (255, 255, 255)
+black = (0, 0, 0)
+red   = (255, 0, 0)
+blue  = (0, 0, 255)
+purple= (200, 0, 200)
+green = (0, 200, 0)
+
+font = pygame.font.Font(None, 30)
+
+arcRect = pygame.Rect(180, 180, 40, 40)
+
+#Game loop
+while True:
+    time_passed = clock.tick(FPS)
+
+    #Handle events
+    for event in pygame.event.get():
+        if event.type == pygame.QUIT:
+            quit()
+        elif event.type == KEYDOWN:
+            if event.key == K_ESCAPE:
+                quit()
+        elif event.type == MOUSEMOTION:
+            if 0 < event.pos[0] < 400 and 0 < event.pos[1] < 400:
+                pos = event.pos
+
+    #Angle logic
+    dx = pos[0] - origin[0]
+    dy = pos[1] - origin[1]
+    rads = atan2(-dy,dx)
+    rads %= 2*pi
+    degs = degrees(rads)
+
+    screen.fill(white)
+
+    #Draw coordinate axes and labels
+    pygame.draw.circle(screen, black, origin, 5)
+    pygame.draw.line(screen, black, (0, 440), (440, 440), 3)
+    pygame.draw.line(screen, black, (200, 15), (200, 380))
+    screen.blit(font.render( "pi/2", True, black), (178, 10))
+    screen.blit(font.render("3pi/2", True, black), (175, 380))
+    pygame.draw.line(screen, black, (28, 200), (355, 200))
+    screen.blit(font.render("pi", True, black), (8,  190))
+    screen.blit(font.render("0", True, black), (360, 190))
+
+    #Draw lines to cursor
+    pygame.draw.line(screen, blue, origin, (pos[0], origin[1]), 2)
+    pygame.draw.line(screen, red, (pos[0], origin[1]), (pos[0], pos[1]), 2)
+    pygame.draw.line(screen, purple, origin, pos, 2)
+    pygame.draw.arc(screen, green, arcRect, 0, rads, 4)
+    #Note that the function expects angles in radians
+
+    #Draw numeric readings
+    screen.blit(font.render(str(dx)+" x", True, blue), (10, 450))
+    screen.blit(font.render(str(dy)+" y", True, red), (100, 450))
+    screen.blit(font.render(str((dx**2 + dy**2)**.5)+" d", True, purple), (10, 480))
+    screen.blit(font.render(str(degs)+" degrees", True, green), (10, 510))
+
+    pygame.display.flip()