I was showing a grandson patterns drawn with Python's Turtle module, and he asked to see concentric circles. I thought it would be faster to use the turtle's circle() to draw them than to write my own code for generating a circle. Ha! I am stuck. I see that the circle produced begins its circumference at the turtle's current location and its direction of drawing depends on turtle's current direction of motion, but I can't figure out what I need to do to get concentric circles. I am not at this point interested in an efficient way of producing concentric circles: I want to see what I have to do to get this way to work: def turtle_pos(art,posxy,lift): if lift: art.penup() art.setposition(posxy) art.pendown() def drawit(tshape,tcolor,pen_color,pen_thick,scolor,radius,mv): window=turtle.Screen() #Request a screen window.bgcolor(scolor) #Set its color #...code that defines the turtle trl for j in range(1,11): turtle_pos(trl,[trl.xcor()+mv,trl.ycor()-mv],1) trl.circle(j*radius) drawit("turtle","purple","green",4,"black",20,30) Continue reading...
