Question

Need help with drawing the Olympic Logo with C

Answer 1

The Olympic logo shown below consists of 5 colored rings. Mimic this logo by drawing circles with the turtle library. You can lift the pen up and down using turtle pen up and turtle pen down. To change the turtle’s pen color, use turtle set pen color. Turtle set pen color(0, 255, 0) makes the pen color entirely green, turtle set pen color(0, 0, 0) makes it black, and turtle set pen color(150, 123, 182 makes it lavender.

Answer 2

does the library have a draw circle routine ?

Answer 3

we tried to draw using the while loop

Answer 4

{
turtle_init(600,600);
int angle = 0;

while (angle < 360)
{
turtle_forward(1);
turtle_turn_left(1);
angle++;
}

Answer 5

ok. Have you learned how to write subroutines (or functions) ?
because you have to use that a few times.

Answer 6

Nope

Answer 7

Well what do you mean by "subroutines (or functions)"?

Answer 8

for example forward(200) is a function (that is in the library)
if would be convenient if we had a circle(radius, centerx, centery)
that drew a circle

Answer 9

I did not learn that :(

Answer 10

Is there any other way to do this?

Answer 11

btw, your circle code will make a very tiny circle. You will have to "debug" it

***Is there any other way to do this? ***

yes, you copy and paste the circle code (once for each circle)
but will different "start position", and line color

the program will get long, but it will work.

Answer 12

OK I think I am ready

Answer 13

what is your code for a circle? Have you tested it ?

Answer 14

Do you mean this:
{
turtle_init(600,600);
int angle = 0;

while (angle < 360)
{
turtle_forward(1);
turtle_turn_left(1);
angle++;
}

Answer 15

If yes, then I have tested this.

Answer 16

how big is the circle ?

Answer 17

The Olympic circle?

Answer 18

when you run your circle program, it draws a circle. How big is it?
we have to fit 3 across on the screen

Answer 19

It's something like this:

Answer 20

ok. can you draw a circle on each side of it ? (by changing the start position, and keeping the code the same)

maybe we can do it in a loop ?

Answer 21

I have only learned while loop.

Answer 22

And the if-then executions

Answer 23

you can make it count by doing:
ct=0
while ( ct++ < 3)
{
do stuff
}

Answer 24

I don't understand the command @phi

Answer 25

you want to draw more than 1 circle
you could do something like
x= 200;
y= 600;
ct= 0;
while (ct++ < 3)
{
turtle_init(x,y);
do the circle stuff
x+= 130; (this is a guess)
}

Answer 26

What does the x represent?

Answer 27

the start position for the circle. If you want different circles, we have to change it
each time "through the loop"

Answer 28

And the y?

Answer 29

you have turtle_init(600,600)

we want to be a able to change that (all the circles have to start at different places)
so I was thinking ahead... we will also want to change the y values for the bottom 2 circles

Answer 30

ok

Answer 31

try something.it might make more sense if you experiment.

Answer 32

i am testing it out right now

Answer 33

Is it going to be something like this:
#include "turtle.h"

{
int x=200;
int y=600;
int ct=0;
while(ct++ <3)
{
turtle_init(600,600)

int angle = 0;

while (angle < 360)
{
turtle_forward(1);
turtle_turn_left(1);
angle++;
}

Answer 34

I don't know what turtle_init does, but I'm thinking it erases everything on the screen and then "puts" the pen at the position you tell it.

so we can't use it to move to the next circle.

maybe we have to
draw the circle
lift the pen
move to the new start position
lower the pen

does that make sense ?

Answer 35

turtle_init I think just sets the greatest and shortest amount of pixels on the screen

Answer 36

it must also set the start position of the pen ?