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Author: anserwaseem

ex9_3SheepVaryingLifeSpan.pyde

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+from random import choice
+
+WHITE = color(255)
+BROWN = color(102,51,0)
+RED = color(255,0,0)
+GREEN = color(0,102,0)
+YELLOW = color(255,255,0)
+PURPLE = color(102,0,204)
+
+class Sheep:
+    def __init__(self,x,y,col):
+        self.x = x #x-position
+        self.y = y #y-position
+        self.sz = 10 #size
+        self.energy = 30 #energy level
+        self.eaten = False
+        self.col = col
+        self.age = 0 #age of sheep
+
+    def update(self):
+        #make sheep walk randomly
+        move = 5 #the maximum it can move in any direction
+        self.energy -= 1 #walking costs energy
+        self.age += 0.1 #sheep loses a small part of its age as it walks
+        if self.energy <= 0 or self.age >= 10: #remove a Sheep if energy is finished or its time is finished.
+            sheepList.remove(self)
+        if self.energy >= 50:
+            self.energy -= 30 #giving birth takes energy
+            #add another sheep to the list
+            sheepList.append(Sheep(self.x,self.y,self.col))
+        self.x += random(-move, move)
+        self.y += random(-move, move)
+        #"wrap" the world Asteroids-style
+        if self.x > width:
+            self.x %= width
+        if self.y > height:
+            self.y %= height
+        if self.x < 0:
+            self.x += width
+        if self.y < 0:
+            self.y += height
+        #find the patch of grass you're on in the grassList:
+        xscl = int(self.x / patchSize)
+        yscl = int(self.y / patchSize)
+        grass = grassList[xscl * rows_of_grass + yscl]
+        if not grass.eaten:
+            self.energy += grass.energy
+            grass.eaten = True
+        fill(self.col) #its own color
+        self.sz = 0.75*self.energy
+        ellipse(self.x,self.y,self.sz,self.sz)
+
+class Grass:
+    def __init__(self,x,y,sz):
+        self.x = x #x-position
+        self.y = y #y-position
+        self.energy = 10 #energy from eating this patch
+        self.eaten = False #hasn't been eaten yet
+        self.sz = sz
+
+    def update(self):
+        if self.eaten:
+            if random(100) < 5:
+                self.eaten = False
+            else:
+                fill(BROWN)
+        else:
+            fill(GREEN)
+        rect(self.x,self.y,self.sz,self.sz)
+    
+sheepList = [] #list to store sheep
+grassList = [] #list to store grass“def setup():
+patchSize = 10 #size of each patch of grass
+colorList = [WHITE,RED,YELLOW,PURPLE]
+
+def setup():
+    global patchSize, rows_of_grass
+    size(600,600)
+    rows_of_grass = height/patchSize
+    noStroke()
+    #create the sheep
+    for i in range(20):
+        sheepList.append(Sheep(random(width),random(height),choice(colorList)))
+    #create the grass:
+    for x in range(0,width,patchSize):
+        for y in range(0,height,patchSize):
+            grassList.append(Grass(x,y,patchSize))
+            
+def draw():
+    background(255)
+    #update the grass first
+    for grass in grassList:
+        grass.update()
+    #then the sheep
+    for sheep in sheepList:
+        sheep.update()