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This script draws a linear interpolation between two shapes. First you need to input the number of points you want your shapes to have, then you draw them using arrow keys and OK, and finally you change the value of the interpolation with left and right keys. Have fun!

#Shape Morpher - by Squarepoint
#Credits to Scratch user Dinosu for heavy inspiration
from ion import *
from kandinsky import *
from time import sleep
x1=[]
y1=[]
x2=[]
y2=[]
lintx=[]
linty=[]
x=159
y=100
t=0
res=int(input("Write max number of points(re\ncommended: 50)\n"))
def move(x,y):
  fill_rect(x,y,2,2,color(200,200,200))
  if keydown(KEY_LEFT)and x>0: x-=3
  elif keydown(KEY_RIGHT)and x<318: x+=3
  if keydown(KEY_UP)and y>20: y-=3
  elif keydown(KEY_DOWN)and y<220: y+=3
  return x,y
def drawshape(x,y):
  if len(x)==1:
    fill_rect(x[0],y[0],2,2,color(0,0,0))
  else:
    for i in range(len(x)-1):
      draw_line(x[i],y[i],x[i+1],y[i+1],color(0,0,0))
def linearly_interpolate(a,b,t):
  return int((b-a)*t+a)
def draw_line(x1,y1,x2,y2,c):
  for i in range(10):
    fill_rect(linearly_interpolate(x1,x2,i/10),linearly_interpolate(y1,y2,i/10),2,2,color(0,0,0))
fill_rect(0,18,320,204,color(200,200,200))
while True:
  draw_string("Draw first shape. Space left:"+str(res-len(x1))+"  ",0,0)
  x,y=move(x,y)
  drawshape(x1,y1)
  fill_rect(x,y,2,2,color(255,0,0))
  sleep(0.02)
  if len(x1)==res:
    break
  if keydown(KEY_OK):
      x1.append(x)
      y1.append(y)
      sleep(0.1)
fill_rect(0,18,320,204,color(200,200,200))
while True:
  draw_string("Draw second shape.Space left:"+str(res-len(x2))+"  ",0,0)
  x,y=move(x,y)
  drawshape(x2,y2)
  fill_rect(x,y,2,2,color(255,0,0))
  sleep(0.02)
  if len(x2)==res:
    break
  if keydown(KEY_OK):
      x2.append(x)
      y2.append(y)
      sleep(0.1)
draw_string("Now press left/right for magic!",0,0)
fill_rect(0,18,320,204,color(200,200,200))
lintx=[]
linty=[]
for i in range(res):
  lintx.append(linearly_interpolate(x1[i],x2[i],t))
  linty.append(linearly_interpolate(y1[i],y2[i],t))
drawshape(lintx,linty)
while True:
  if keydown(KEY_LEFT) and t>0:
    fill_rect(0,18,320,204,color(200,200,200))
    t-=0.05
    lintx=[]
    linty=[]
    for i in range(res):
      lintx.append(linearly_interpolate(x1[i],x2[i],t))
      linty.append(linearly_interpolate(y1[i],y2[i],t))
    drawshape(lintx,linty)
  elif keydown(KEY_RIGHT)and t<1:
    fill_rect(0,18,320,204,color(200,200,200))
    t+=0.05
    lintx=[]
    linty=[]
    for i in range(res):
      lintx.append(linearly_interpolate(x1[i],x2[i],t))
      linty.append(linearly_interpolate(y1[i],y2[i],t))
    drawshape(lintx,linty)
  sleep(0.05)