fibonacci_spiral

Fibonacci Spiral heart

Wish

I might have seen it on pinterest or instagram and thought to recreate it with Python (see output)

turtle.circle() method

• As you would have deduced correctly, this method will draw a circle. If you want to draw a semi-circle or a quadrant of a circle you can still use this very same method.
• turtle.circle takes two arguments --> turtle.circle(raidus, extent). Here extent can be defined as by how much degrees you want the arc to be drawn.
• So, if you want to draw a quadrant, turtle.circle(radius, 90) will do it. For a semi-circle, turtle.circle(raidus, 180) would suffice.
• Now there are two orientations of drawing a circle: clockwise and anti-clockwise. The second argument in turtle.circle method and turtle's heading angle governs the orientation and position (see turtle circle orientation).

turtle circle orientation

Here's what the code is doing

1. I created a function that draws a square. I named it draw_square
2. I am calling draw_square function in a for loop. Because draw_square leaves the turtle headed in East. I am calling:
   1. turtle.right(180) to head turtle in West (see turtle circle orientation for reasoning behind it).
   2. turtle.tilt(180) to flip it. tilt does not change orientation where the turtle is headed.
   3. turtle.circle(radius, -90) to draw quadrant of circle.
   4. Then again I am calling turtle.right(180) and turtle.tilt(180). The purpose is same as stated in Pt 2.1-2.3 (If you happen to try this code, try commenting out right and tilt methods to see how the code behaves. It is just silly me trying to make my code work :))
3. I have used if-else block to change the color. Red is for heart.

draw_square function

Notice that after the function is called to draw square, turtle is left headed in East.

Output

Future work

• I have hardcoded the fibonacci series, I can attempt to write a function that generates fibonacci series based on the number of elements taken as input from the user (it will certainly effect the orientation in which the heart will display in the output, it will then be at discretion of user's input).
• enumerate method can be used in for loop.