Add Chapter 8 python files

thinkcspy/Chapter-8-Exercises/Python-files/Problem10.py

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+# Runestone.Academy thinkcspy course
+# Chapter 8
+# Problem 10
+
+import image
+
+
+img = image.Image("luther.jpg")
+win = image.ImageWin(img.getWidth(), img.getHeight())
+img.draw(win)
+img.setDelay(0)   # setDelay(0) turns off animation
+        
+
+for row in range(img.getHeight()):
+    for col in range(img.getWidth()):
+        p = img.getPixel(col, row)
+        
+        R = p.getRed()
+        G = p.getGreen()
+        B = p.getBlue()
+        
+        newred = (R * 0.393 + G * 0.769 + B * 0.189)
+        newgreen = (R * 0.349 + G * 0.686 + B * 0.168)
+        newblue = (R * 0.272 + G * 0.534 + B * 0.131)
+        
+        newpixel = image.Pixel(newred, newgreen, newblue)
+
+        img.setPixel(col, row, newpixel)
+
+img.draw(win)
+win.exitonclick()

thinkcspy/Chapter-8-Exercises/Python-files/Problem2.py

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+# Runestone.Academy thinkcspy course
+# Chapter 8
+# Problem 2
+
+def print_triangular_numbers(n):
+    # your code here
+    i = 1
+
+    while i <= n:
+        trinum = 0
+        bound = i
+        
+        while bound > 0:
+            trinum += bound
+            bound -= 1
+
+        print(i, "\t", trinum)
+        i += 1
+    
+print_triangular_numbers(5)

thinkcspy/Chapter-8-Exercises/Python-files/Problem3.py

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+# Runestone.Academy thinkcspy course
+# Chapter 8
+# Problem 3
+
+import math
+
+def is_prime(n):
+    # your code here
+    
+    x = 3
+  
+    if abs(n) > 2:
+        while x < math.sqrt(n):
+            if n % 2 == 0:
+                return False
+            elif n % x == 0:
+                return False
+            else:
+                x += 2
+        return True
+    else:
+        return True
+
+print(is_prime(4813))

thinkcspy/Chapter-8-Exercises/Python-files/Problem6.py

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+# Runestone.Academy thinkcspy course
+# Chapter 8
+# Problem 6
+
+import random
+import turtle
+import math
+
+def isInScreen(w, t, lBound, rBound, bBound, tBound):
+    turtleX = t.xcor()
+    turtleY = t.ycor()
+
+    stillIn = True
+    if turtleX > rBound or turtleX < lBound:
+        stillIn = False
+    if turtleY > tBound or turtleY < bBound:
+        stillIn = False
+
+    return stillIn
+
+
+def randGoto(t, num1, num2):
+    return random.randrange(num1, num2)
+
+
+def randPos(t, lBound, rBound, bBound, tBound):
+    xpos = randGoto(t, lBound, rBound)
+    ypos = randGoto(t, bBound, tBound)
+    t.up()
+    t.goto(xpos, ypos)
+    t.down()
+
+    
+def spaceBetween(num1, num2):
+    if math.sqrt(num1**2 + num2**2) < 5:
+        return True
+    else: 
+        return False
+    
+    
+def randMove(wn, t1, t2, lBound, rBound, bBound, tBound):
+    randPos(t1, lBound, rBound, bBound, tBound)
+    randPos(t2, lBound, rBound, bBound, tBound)
+    
+    while isInScreen(wn, t1, lBound, rBound, bBound, tBound) and isInScreen(wn, t2, lBound, rBound, bBound, tBound):
+        t1x = t1.xcor()
+        t1y = t1.ycor()
+        t2x = t2.xcor()
+        t2y = t2.ycor()
+        coin = random.randrange(0, 2)
+        
+        if spaceBetween(t1x, lBound) or spaceBetween(t1x, rBound) or spaceBetween(t1y, bBound) or  spaceBetween(t1y, tBound):
+            t1.right(170)
+        if spaceBetween(t2x, lBound) or spaceBetween(t2x, rBound) or spaceBetween(t2y, bBound) or  spaceBetween(t2y, tBound):
+            t2.right(170) 
+        if spaceBetween(t1x, t2x) or spaceBetween(t1y, t2y):
+            t1.left(170)
+            t2.right(170)
+            
+        if coin == 0:
+            t1.left(random.randrange(1,180))
+            t2.left(random.randrange(1,180))
+        else:
+            t1.right(random.randrange(1,180))
+            t2.right(random.randrange(1,180))
+
+        t1.forward(50)
+        t2.forward(50)        
+        
+        
+
+wn = turtle.Screen()
+wn.bgcolor("lightblue")
+
+x1 = -wn.window_width() / 2
+x2 = wn.window_width() / 2
+y1 = -wn.window_height() / 2
+y2 = wn.window_height() / 2
+
+ella = turtle.Turtle()
+ella.color("pink")
+ella.shape('turtle')
+
+micah = turtle.Turtle()
+micah.color("green")
+micah.shape('turtle')
+
+randMove(wn, ella, micah, x1, x2, y1, y2)
+
+
+wn.exitonclick()

thinkcspy/Chapter-8-Exercises/Python-files/Problem8.py

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+# Runestone.Academy thinkcspy course
+# Chapter 8
+# Problem 8
+
+import image
+
+def greyScale (red, blue, green):    
+    return (red + blue + green)/3
+
+img = image.Image("luther.jpg")
+win = image.ImageWin(img.getWidth(), img.getHeight())
+img.draw(win)
+img.setDelay(0)   # setDelay(0) turns off animation
+
+for row in range(img.getHeight()):
+    for col in range(img.getWidth()):
+        p = img.getPixel(col, row)
+        
+        pixelColor = greyScale(p.getRed(), p.getGreen(), p.getBlue())
+
+        newblue = newgreen = newred = pixelColor
+        
+        newpixel = image.Pixel(newred, newgreen, newblue)
+
+        img.setPixel(col, row, newpixel)
+
+img.draw(win)
+win.exitonclick()

thinkcspy/Chapter-8-Exercises/Python-files/Problem9.py

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+# Runestone.Academy thinkcspy course
+# Chapter 8
+# Problem 9
+
+import image
+
+def greyScale (red, blue, green):
+    return (red + blue + green)/3
+
+def blackWhite (color):
+    if color >= 255 / 2:
+        return 255
+    else:
+        return 0
+
+img = image.Image("luther.jpg")
+win = image.ImageWin(img.getWidth(), img.getHeight())
+img.draw(win)
+img.setDelay(0)   # setDelay(0) turns off animation
+
+for row in range(img.getHeight()):
+    for col in range(img.getWidth()):
+        p = img.getPixel(col, row)
+        
+        pixelColor = greyScale(p.getRed(), p.getGreen(), p.getBlue())
+        
+        newblue = newgreen = newred = blackWhite(pixelColor)
+        
+        newpixel = image.Pixel(newred, newgreen, newblue)
+
+        img.setPixel(col, row, newpixel)
+
+img.draw(win)
+win.exitonclick()