Chapter 1 examples.

chp1_vectors/NOC_1_10_motion101_acceleration/NOC_1_10_motion101_acceleration.pyde

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+# The Nature of Code
+# Daniel Shiffman
+# http://natureofcode.com
+
+from mover import Mover
+
+
+def setup():
+    size(640, 360)
+    global mover
+    mover = Mover()
+
+
+def draw():
+    background(255)
+
+    # Update the location
+    mover.update()
+    # Display the Mover
+    mover.display()
+

chp1_vectors/NOC_1_10_motion101_acceleration/mover.py

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+# The Nature of Code
+# Daniel Shiffman
+# http://natureofcode.com
+# A Mover object
+
+
+class Mover(object):
+
+    def __init__(self):
+        # The Mover tracks location, velocity, and acceleration
+        # Start in the center
+        self.location = PVector(width / 2, height / 2)
+        self.velocity = PVector(0, 0)
+        # The Mover's maximum speed
+        self.topspeed = 5
+
+    def update(self):
+        # Compute a vector that points from location to mouse
+        mouse = PVector(mouseX, mouseY)
+        acceleration = PVector.sub(mouse, self.location)
+        # Set magnitude of acceleration
+        acceleration.setMag(0.2)
+
+        # Velocity changes according to acceleration
+        self.velocity.add(acceleration)
+        # Limit the velocity by topspeed
+        self.velocity.limit(self.topspeed)
+        # Location changes by velocity
+        self.location.add(self.velocity)
+
+    def display(self):
+        stroke(0)
+        strokeWeight(2)
+        fill(127)
+        ellipse(self.location.x, self.location.y, 48, 48)
+

chp1_vectors/NOC_1_11_motion101_acceleration_array/NOC_1_11_motion101_acceleration_array.pyde

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+# The Nature of Code
+# Daniel Shiffman
+# http://natureofcode.com
+# Demonstration of the basics of motion with vector.
+# A "Mover" object stores location, velocity, and acceleration as vectors
+# The motion is controlled by affecting the acceleration (in this case
+# towards the mouse)
+
+from mover import Mover
+
+moverCount = 20
+movers = []
+
+
+def setup():
+    size(640, 360)
+    for i in range(moverCount):
+        movers.append(Mover())
+
+
+def draw():
+    background(255)
+    for mover in movers:
+        mover.update()
+        mover.display()
+

chp1_vectors/NOC_1_11_motion101_acceleration_array/mover.py

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+# The Nature of Code
+# Daniel Shiffman
+# http://natureofcode.com
+
+
+class Mover(object):
+
+    def __init__(self):
+        # The Mover tracks location, velocity, and acceleration
+        # Start in the center
+        self.location = PVector(random(width), random(height))
+        self.velocity = PVector(0, 0)
+        # The Mover's maximum speed
+        self.topspeed = 5
+
+    def update(self):
+        # Compute a vector that points from location to mouse
+        mouse = PVector(mouseX, mouseY)
+        acceleration = PVector.sub(mouse, self.location)
+        # Set magnitude of acceleration
+        # acceleration.setMag(0.2)
+        acceleration.normalize()
+        acceleration.mult(0.2)
+
+        # Velocity changes according to acceleration
+        self.velocity.add(acceleration)
+        # Limit the velocity by topspeed
+        self.velocity.limit(self.topspeed)
+        # Location changes by velocity
+        self.location.add(self.velocity)
+
+    def display(self):
+        stroke(0)
+        strokeWeight(2)
+        fill(127, 200)
+        ellipse(self.location.x, self.location.y, 48, 48)
+

chp1_vectors/NOC_1_1_bouncingball_novectors/NOC_1_1_bouncingball_novectors.pyde

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+# The Nature of Code
+# Daniel Shiffman
+# http://natureofcode.com
+# Example 1-1: Bouncing Ball, no vectors
+
+x = 100
+y = 100
+xspeed = 2.5
+yspeed = 2
+
+
+def setup():
+    size(800, 200)
+    smooth()
+
+
+def draw():
+    background(255)
+    # Add the current speed to the location.
+    global x, y, xspeed, yspeed
+    x = x + xspeed
+    y = y + yspeed
+    if (x > width) or (x < 0):
+        xspeed = xspeed * -1
+    if (y > height) or (y < 0):
+        yspeed = yspeed * -1
+    # Display circle at x location
+    stroke(0)
+    strokeWeight(2)
+    fill(127)
+    ellipse(x, y, 48, 48)
+

chp1_vectors/NOC_1_2_bouncingball_vectors/NOC_1_2_bouncingball_vectors.pyde

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+# The Nature of Code
+# Daniel Shiffman
+# http://natureofcode.com
+# Example 1-2: Bouncing Ball, with PVector!
+
+
+def setup():
+    size(200, 200)
+    background(255)
+    global location, velocity
+    location = PVector(100, 100)
+    velocity = PVector(2.5, 5)
+
+
+def draw():
+    noStroke()
+    fill(255, 10)
+    rect(0, 0, width, height)
+
+    # Add the current speed to the location.
+    global location, velocity
+    location.add(velocity)
+    if (location.x > width) or (location.x < 0):
+        velocity.x = velocity.x * -1
+    if (location.y > height) or (location.y < 0):
+        velocity.y = velocity.y * -1
+    # Display circle at x location
+    stroke(0)
+    fill(175)
+    ellipse(location.x, location.y, 16, 16)
+

chp1_vectors/NOC_1_3_vector_subtraction/NOC_1_3_vector_subtraction.pyde

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+# The Nature of Code
+# Daniel Shiffman
+# http://natureofcode.com
+# Example 1-3: Vector subtraction
+
+
+def setup():
+    size(640, 360)
+
+
+def draw():
+    background(255)
+
+    mouse = PVector(mouseX, mouseY)
+    center = PVector(width / 2, height / 2)
+    mouse.sub(center)
+
+    translate(width / 2, height / 2)
+    strokeWeight(2)
+    stroke(0)
+    line(0, 0, mouse.x, mouse.y)
+

chp1_vectors/NOC_1_4_vector_multiplication/NOC_1_4_vector_multiplication.pyde

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+# The Nature of Code
+# Daniel Shiffman
+# http://natureofcode.com
+# Example 1-4: Vector multiplication
+
+
+def setup():
+    size(640, 360)
+    smooth()
+
+
+def draw():
+    background(255)
+
+    mouse = PVector(mouseX, mouseY)
+    center = PVector(width / 2, height / 2)
+    mouse.sub(center)
+
+    # Multiplying a vector! The vector is now half its original size
+    # (multiplied by 0.5).
+    mouse.mult(0.5)
+
+    translate(width / 2, height / 2)
+    strokeWeight(2)
+    stroke(0)
+    line(0, 0, mouse.x, mouse.y)
+

chp1_vectors/NOC_1_5_vector_magnitude/NOC_1_5_vector_magnitude.pyde

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+# The Nature of Code
+# Daniel Shiffman
+# http://natureofcode.com
+# Example 1-5: Vector magnitude
+
+
+def setup():
+    size(640, 360)
+
+
+def draw():
+    background(255)
+
+    mouse = PVector(mouseX, mouseY)
+    center = PVector(width / 2, height / 2)
+    mouse.sub(center)
+    m = mouse.mag()
+    fill(0)
+    noStroke()
+    rect(0, 0, m, 10)
+
+    translate(width / 2, height / 2)
+    stroke(0)
+    strokeWeight(2)
+    line(0, 0, mouse.x, mouse.y)
+

chp1_vectors/NOC_1_6_vector_normalize/NOC_1_6_vector_normalize.pyde

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+# The Nature of Code
+# Daniel Shiffman
+# http://natureofcode.com
+# Demonstration of normalizing a vector.
+# Normalizing a vector sets its length to 1.
+
+
+def setup():
+    size(640, 360)
+
+
+def draw():
+    background(255)
+
+    # A vector that points to the mouse location
+    mouse = PVector(mouseX, mouseY)
+    # A vector that points to the center of the window
+    center = PVector(width / 2, height / 2)
+    # Subtract center from mouse which results in a vector that points from
+    # center to mouse
+    mouse.sub(center)
+
+    # Normalize the vector
+    mouse.normalize()
+
+    # Multiply its length by 50
+    mouse.mult(150)
+
+    translate(width / 2, height / 2)
+    # Draw the resulting vector
+    stroke(0)
+    strokeWeight(2)
+    line(0, 0, mouse.x, mouse.y)
+

chp1_vectors/NOC_1_7_motion101/NOC_1_7_motion101.pyde

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+# The Nature of Code
+# Daniel Shiffman
+# http://natureofcode.com
+
+from mover import Mover
+
+
+def setup():
+    size(640, 360)
+    global mover
+    mover = Mover()
+
+
+def draw():
+    background(255)
+
+    mover.update()
+    mover.checkEdges()
+    mover.display()
+

chp1_vectors/NOC_1_7_motion101/mover.py

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+# The Nature of Code
+# Daniel Shiffman
+# http://natureofcode.com
+
+
+class Mover(object):
+
+    def __init__(self):
+        self.location = PVector(random(width), random(height))
+        self.velocity = PVector(random(-2, 2), random(-2, 2))
+
+    def update(self):
+        self.location.add(self.velocity)
+
+    def display(self):
+        stroke(0)
+        strokeWeight(2)
+        fill(127)
+        ellipse(self.location.x, self.location.y, 48, 48)
+
+    def checkEdges(self):
+        if self.location.x > width:
+            self.location.x = 0
+        elif self.location.x < 0:
+            self.location.x = width
+
+        if self.location.y > height:
+            self.location.y = 0
+        elif self.location.y < 0:
+            self.location.y = height
+

chp1_vectors/NOC_1_8_motion101_acceleration/NOC_1_8_motion101_acceleration.pyde

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+# The Nature of Code
+# Daniel Shiffman
+# http://natureofcode.com
+
+from mover import Mover
+
+
+def setup():
+    size(640, 360)
+    global mover
+    mover = Mover()
+
+
+def draw():
+    background(255)
+
+    mover.update()
+    mover.checkEdges()
+    mover.display()
+