Initial commit

Python/donut.py

@@ -0,0 +1,73 @@
+import os
+from math import sin, cos
+
+def main():
+    a=0
+    b=0
+
+    height=24
+    width=80
+    #height=int(input("Enter Screen Height : "))
+    #width=int(input("Enter Screen Width : "))
+    
+	# for clearing console (windows and unix systems)
+    clear = "cls"
+    if os.name == "posix":
+        clear = "clear"
+
+    os.system(clear)
+    while True:
+        z = [0 for _ in range(4*height*width)]
+        screen = [' ' for _ in range(height*width)]
+
+        j=0
+        while j<6.28:
+            j+=0.07
+            i=0
+            while i<6.28:
+                i+=0.02
+
+                sinA=sin(a)
+                cosA=cos(a)
+                cosB=cos(b)
+                sinB=sin(b)
+
+                sini=sin(i)
+                cosi=cos(i)
+                cosj=cos(j)
+                sinj=sin(j)
+
+                cosj2=cosj+2
+                mess=1/(sini*cosj2*sinA+sinj*cosA+5)
+                t=sini*cosj2*cosA-sinj* sinA
+
+                # 40 is the left screen shift
+                x = int(40+30*mess*(cosi*cosj2*cosB-t*sinB))
+                # 12 is the down screen shift
+                y = int(11+15*mess*(cosi*cosj2*sinB +t*cosB))
+                # all are casted to int, ie floored
+                o = int(x+width*y)
+				# multiplying by 8 to bring in range 0-11 as 8*(sqrt(2))=11
+				# because we have 11 luminance characters
+                N = int(8*((sinj*sinA-sini*cosj*cosA)*cosB-sini*cosj*sinA-sinj*cosA-cosi *cosj*sinB))
+				# if x,y inside screen and previous z-buffer is < mess 
+				# i.e. when z[o] is 0 or the prev point is behind the new point
+				# so we change it to the point nearer to the eye/ above prev point 
+                if 0<y<height and 0<x<width and z[o] < mess:
+                    z[o]=mess
+                    screen[o]=".,-~:;=!*#$@"[N if N>0 else 0]
+
+        # prints
+        os.system(clear)
+        for index, char in enumerate(screen):
+            if index % width == 0:
+                print()
+            else:
+                print(char, end='')
+
+        # increments
+        a+=0.04
+        b+=0.02
+
+if __name__ == "__main__":
+    main()