c_std/turtle at main · KaisenAmin/c_std

Name	Name	Last commit message	Last commit date
parent directory ..
CMakeLists.txt	CMakeLists.txt
README.md	README.md
turtle.c	turtle.c
turtle.h	turtle.h

Turtle Graphics Library in C

Author: Amin Tahmasebi
Release Date: 2024
License: ISC License

Overview

The Turtle Graphics library in C provides functions for drawing shapes and lines using a "turtle" that moves around the screen. Inspired by the Python turtle module, this library allows C developers to easily create graphics and animations.

Key Features

Turtle Movement: Functions to move the turtle forward and turn it to different angles.
Drawing Control: Functions to lift and lower the pen, control the drawing color, and set the turtle's speed.
Window Management: Functions to initialize the drawing window, set the frame rate, and clear the background.
User-Defined Drawing Functions: Support for user-defined drawing functions to be executed within the main drawing loop.
Documentation: Fully documented with Doxygen format for easy integration and usage.

Installation and Compilation

Installing Dependencies

To use this library, you need to have the raylib library installed. Follow the instructions below for your operating system:

Linux

Clone the raylib repository and build it from source:

git clone https://github.com/raysan5/raylib.git
cd raylib/src
make PLATFORM=PLATFORM_DESKTOP
sudo make install

Install additional required packages:

sudo apt-get install libx11-dev libxcursor-dev libxrandr-dev libxinerama-dev libxi-dev libgl1-mesa-dev

Rebuild raylib with -fPIC:

To ensure raylib is compiled with position-independent code, follow these steps:

mkdir build
cd ~/Desktop/raylib/build
make clean
cmake .. -DCMAKE_C_FLAGS="-fPIC" -DCMAKE_BUILD_TYPE=Release
make
sudo make install

Windows

For Windows, it is recommended to use MSYS2 to install raylib. First, download and install MSYS2 from msys2.org. Then, open the MSYS2 terminal and run the following commands:

pacman -Syu
pacman -S mingw-w64-x86_64-raylib

Compiling the Turtle Graphics Library

To use this library, include turtle.h in your project and compile the source files with your C compiler. For GCC, the following command can be used:

gcc -std=c17 -O3 -march=native -flto -funroll-loops -Wall -Wextra -pedantic -s -o main ./main.c ./turtle/turtle.c -lraylib -lm

Rebuilding the Project

After raylib has been successfully recompiled and installed, go back to your c_std project directory and clean the build files:

cd ~/Desktop/c_std/build
rm -rf CMakeCache.txt CMakeFiles/ build/
cmake -G "Unix Makefiles" -DCMAKE_C_COMPILER=gcc -DCMAKE_CXX_COMPILER=g++ ..
cmake --build .

Documentation

The documentation includes detailed descriptions of all the functions provided by the library, along with usage examples. It covers basic operations like moving the turtle and drawing shapes.

Function Descriptions

void turtle_create(void): Initializes the turtle's position, heading, color, and other settings.
void turtle_close_window(void): Closes the drawing window.
void turtle_init_window(int width, int height, const char* title): Initializes the drawing window with the specified width, height, and title.
void turtle_set_fps(int fps): Sets the frame rate for the drawing window.
void turtle_set_speed(float speed): Sets the speed of the turtle's movement.
void turtle_forward(float distance): Moves the turtle forward by the specified distance.
void turtle_position(float *x, float *y): Retrieves the current position of the turtle.
void turtle_turn(float angle): Turns the turtle by the specified angle.
void turtle_right(float angle): Turns the turtle to the right by the specified angle.
void turtle_left(float angle): Turns the turtle to the left by the specified angle.
void turtle_pen_up(void): Lifts the pen, so moving the turtle will not draw.
void turtle_pen_down(void): Lowers the pen, so moving the turtle will draw.
void turtle_set_color(unsigned char r, unsigned char g, unsigned char b, unsigned char a): Sets the color for drawing.
void turtle_draw(void): Draws the lines and shapes created by the turtle.
void turtle_begin_drawing(void): Begins the drawing process.
void turtle_clear_background(Color color): Clears the background with the specified color.
void turtle_end_drawing(void): Ends the drawing process.
void turtle_done(TurtleDrawFunc user_draw): Runs the main drawing loop, calling the user-defined drawing function, and keeps the turtle window open until it is manually closed.
void turtle_setposition(float x, float y): Moves the turtle to the specified position.
void turtle_set_x(float x): Sets the turtle's first coordinate to x, leaving the second coordinate unchanged.
void turtle_set_y(float y): Sets the turtle's second coordinate to y, leaving the first coordinate unchanged.
void turtle_set_heading(float angle): Sets the orientation of the turtle to the specified angle in degrees, allowing the turtle to face a specific direction.
void turtle_home(void): Moves the turtle to the origin (coordinates 0,0) and resets its heading to the initial orientation (0 degrees).
void turtle_circle(float radius, float extent, int steps): Draws a circle or an arc with a specified radius and extent, where the extent is the angle of the arc in degrees.
void turtle_dot(float size, unsigned char r, unsigned char g, unsigned char b, unsigned char a): Draws a dot at the turtle's current position with the specified size and color.
void turtle_clear_stamp(int stamp_id): Removes a previously made stamp identified by the provided stamp_id.
int turtle_stamp(void): Creates a stamp at the turtle's current position and returns a unique stamp_id.

Examples

Example 1: Drawing a Star

#include "turtle/turtle.h"

void draw_star(Turtle *state) {
    static bool initialized = false;
    if (!initialized) {
        turtle_right(state, 75);
        turtle_forward(state, 100);

        for (int i = 0; i < 4; i++) {
            turtle_right(state, 144);
            turtle_forward(state, 100);
        }
        initialized = true;
    }
}

int main(void) {
    const int screenWidth = 800;
    const int screenHeight = 600;

    Turtle *state = turtle_create();
    turtle_init_window(screenWidth, screenHeight, "C Turtle Graphics with raylib");
    turtle_set_fps(90);
    turtle_set_speed(state, 5.0f);

    turtle_done(state, draw_star);

    turtle_deallocate(state);
    turtle_close_window();

    return 0;
}

Result:

A star shape is drawn on the screen.

Example 2: Moving the Turtle

#include "turtle/turtle.h"

void draw_movement(Turtle *state) {
    static bool drawn = false; // static variable to ensure drawing happens once

    if (!drawn) {
        turtle_forward(state, 50);
        turtle_right(state, 90);
        turtle_forward(state, 50);
        turtle_right(state, 90);
        turtle_forward(state, 50);
        turtle_right(state, 90);
        turtle_forward(state, 50);
        drawn = true;
    }
}

int main(void) {
    const int screenWidth = 800;
    const int screenHeight = 600;

    Turtle *state = turtle_create();
    turtle_init_window(screenWidth, screenHeight, "Turtle Movement Example");
    turtle_set_fps(60);
    turtle_set_speed(state, 3.0f);

    turtle_done(state, draw_movement);

    turtle_deallocate(state);
    turtle_close_window();

    return 0;
}

Result:

The turtle moves in a square pattern on the screen.

Example 3: Changing the Drawing Color

#include "turtle/turtle.h"

// draw always
void draw_colored_line(Turtle *state) {
    turtle_set_color(state, 255, 0, 0, 255); // Red color
    turtle_forward(state, 100);
    turtle_right(state, 90);
    turtle_set_color(state, 0, 255, 0, 255); // Green color
    turtle_forward(state, 100);
    turtle_right(state, 90);
    turtle_set_color(state, 0, 0, 255, 255); // Blue color
    turtle_forward(state, 100);
    turtle_right(state, 90);
    turtle_set_color(state, 255, 255, 0, 255); // Yellow color
    turtle_forward(state, 100);
}

void draw_colored_line_once(Turtle *state) {
    static bool drawn = false;

    if (!drawn) {
        turtle_set_color(state, 255, 0, 0, 255); // Red color
        turtle_forward(state, 100);
        turtle_right(state, 90);
        turtle_set_color(state, 0, 255, 0, 255); // Green color
        turtle_forward(state, 100);
        turtle_right(state, 90);
        turtle_set_color(state, 0, 0, 255, 255); // Blue color
        turtle_forward(state, 100);
        turtle_right(state, 90);
        turtle_set_color(state, 255, 255, 0, 255); // Yellow color
        turtle_forward(state, 100);
        drawn = true;
    }
}

int main(void) {
    const int screenWidth = 800;
    const int screenHeight = 600;

    Turtle *state = turtle_create();
    turtle_init_window(screenWidth, screenHeight, "Turtle Color Example");
    turtle_set_fps(60);
    turtle_set_speed(state, 2.0f);

    turtle_done(state, draw_colored_line_once);

    turtle_deallocate(state);
    turtle_close_window();

    return 0;
}

Result:

The turtle draws lines in different colors on the screen.

Example 4: Using Pen Up and Pen Down

#include "turtle/turtle.h"

void draw_with_pen_control(Turtle *state) {
    static bool drawn = false;

    if (!drawn) {
        turtle_forward(state, 50);
        turtle_pen_up(state);
        turtle_forward(state, 50);
        turtle_pen_down(state);
        turtle_forward(state, 50);
        drawn = true; 
    }
}

int main(void) {
    const int screenWidth = 800;
    const int screenHeight = 600;

    Turtle *state = turtle_create();
    turtle_init_window(screenWidth, screenHeight, "Turtle Pen Control Example");
    turtle_set_fps(60);
    turtle_set_speed(state, 2.0f);

    turtle_done(state, draw_with_pen_control);

    turtle_deallocate(state);
    turtle_close_window();

    return 0;
}

Result:

The turtle draws two separate lines with a gap in between where the pen is lifted.

Example 5 : Setting the turtle position with `turtle_set_position`

#include "turtle/turtle.h"

void draw_set_position(Turtle *state) {
    static bool drawn = false; // Static variable to ensure drawing happens once

    if (!drawn) {
        turtle_set_position(state, 200, 200);
        turtle_forward(state, 100);
        turtle_set_position(state, 400, 400);
        turtle_forward(state, 100);
        drawn = true; // Mark as drawn
    }
}

int main(void) {
    const int screenWidth = 800;
    const int screenHeight = 600;

    Turtle *state = turtle_create();
    turtle_init_window(screenWidth, screenHeight, "Turtle Set Position Example");
    turtle_set_fps(60);
    turtle_set_speed(state, 2.0f);

    turtle_done(state, draw_set_position);

    turtle_deallocate(state);
    turtle_close_window();

    return 0;
}

Result:

The turtle moves to specified positions and draws lines from those points.

Example 6: turning the turtle left

#include "turtle/turtle.h"

void draw_left_turn(Turtle *state) {
    turtle_forward(state, 100);
    turtle_left(state, 90);
    turtle_forward(state, 100);
    turtle_left(state, 90);
    turtle_forward(state, 100);
    turtle_left(state, 90);
    turtle_forward(state, 100);
}

int main(void) {
    const int screenWidth = 800;
    const int screenHeight = 600;

    Turtle *state = turtle_create();
    turtle_init_window(screenWidth, screenHeight, "Turtle Left Turn Example");
    turtle_set_fps(60);
    turtle_set_speed(state, 2.0f);

    turtle_done(state, draw_left_turn);

    turtle_deallocate(state);
    turtle_close_window();

    return 0;
}

Example 7 : set x and y with `turtle_set_x | turtle_set_y`

#include "turtle/turtle.h"

void draw_set_position(Turtle *state) {
    static bool drawn = false; 

    if (!drawn) {
        turtle_set_x(state, 200);
        turtle_forward(state, 100);
        turtle_set_y(state, 400);
        turtle_forward(state, 100);
        drawn = true; 
    }
}

int main(void) {
    const int screenWidth = 800;
    const int screenHeight = 600;

    Turtle *state = turtle_create();
    
    turtle_init_window(screenWidth, screenHeight, "Turtle Set Position Example");
    turtle_set_fps(60);
    turtle_set_speed(state, 2.0f);

    turtle_done(state, draw_set_position);

    turtle_deallocate(state);
    turtle_close_window();

    return 0;
}

Example 8 : set heading with `turtle_set_heading`

#include "turtle/turtle.h"

void draw_set_heading(Turtle *state) {
    static bool drawn = false; 

    if (!drawn) {
        turtle_set_heading(state, 90);
        turtle_forward(state, 100);
        turtle_set_heading(state, 180);
        turtle_forward(state, 100);
        drawn = true; 
    }
}

int main(void) {
    const int screenWidth = 800;
    const int screenHeight = 600;

    Turtle *state = turtle_create();
    turtle_init_window(screenWidth, screenHeight, "Turtle Set Heading Example");
    turtle_set_fps(60);
    turtle_set_speed(state, 2.0f);

    turtle_done(state, draw_set_heading);

    turtle_deallocate(state);
    turtle_close_window();

    return 0;
}

Example 9 : how to send angle to home position with `turtle_home`

#include "turtle/turtle.h"

void draw_home(Turtle *state) {
    static bool drawn = false;

    if (!drawn) {
        turtle_forward(state, 100);
        turtle_set_heading(state, 90);
        turtle_forward(state, 100);
        turtle_home(state);
        drawn = true;
    }
}

int main(void) {
    const int screenWidth = 800;
    const int screenHeight = 600;

    Turtle *state = turtle_create();
    turtle_init_window(screenWidth, screenHeight, "Turtle Home Example");
    turtle_set_fps(60);
    turtle_set_speed(state, 2.0f);

    turtle_done(state, draw_home);

    turtle_deallocate(state);
    turtle_close_window();

    return 0;
}

Example 10 : how to draw a circle with `turtle_circle`

#include "turtle/turtle.h"

void draw_circle(Turtle *state) {
    static bool drawn = false;

    if (!drawn) {
        turtle_circle(state, 50, 360, 0);
        drawn = true;
    }
}

int main(void) {
    const int screenWidth = 800;
    const int screenHeight = 600;

    Turtle *state = turtle_create();
    turtle_init_window(screenWidth, screenHeight, "Turtle Circle Example");
    turtle_set_fps(60);
    turtle_set_speed(state, 2.0f);

    turtle_done(state, draw_circle);

    turtle_deallocate(state);
    turtle_close_window();

    return 0;
}

Example 11 : draw dot with `turtle_dot`

#include "turtle/turtle.h"

void draw_dot(Turtle *state) {
    static bool drawn = false;

    if (!drawn) {
        turtle_dot(state, 20, 255, 0, 0, 255);  // draw a red dot with size 20
        drawn = true;
    }
}

int main(void) {
    const int screenWidth = 800;
    const int screenHeight = 600;

    Turtle *state = turtle_create();
    turtle_init_window(screenWidth, screenHeight, "Turtle Dot Example");
    turtle_set_fps(60);
    turtle_set_speed(state, 2.0f);

    turtle_done(state, draw_dot);

    turtle_deallocate(state);
    turtle_close_window();

    return 0;
}

Example 12 : clear stamp

#include "turtle/turtle.h"

void draw_stamps(Turtle *state) {
    static bool drawn = false;
    static int stamp_id;

    if (!drawn) {
        turtle_set_color(state, 0, 0, 255, 255);  
        stamp_id = turtle_stamp(state);          // Stamp the turtle at the current position
        turtle_forward(state, 50);                
        turtle_clear_stamp(state, stamp_id);     // Clear the previously stamped turtle
        drawn = true; 
    }
}

int main(void) {
    const int screenWidth = 800;
    const int screenHeight = 600;

    Turtle *state = turtle_create();
    turtle_init_window(screenWidth, screenHeight, "Turtle Stamp Example");
    turtle_set_fps(60);
    turtle_set_speed(state, 2.0f);

    turtle_done(state, draw_stamps);

    turtle_deallocate(state);
    turtle_close_window();

    return 0;
}

Example 13 : calculate the distance with `turtle_distance | turtle_distance_turtle`

#include "turtle/turtle.h"
#include "fmt/fmt.h"

void draw_distance(Turtle *state) {
    static bool drawn = false;
    if (!drawn) {
        turtle_home(state);
        float dist = turtle_distance(state, 30, 40);
        fmt_printf("Distance to (30, 40): %f\n", dist);

        Tu other_turtle;
        other_turtle.position = (Vector2){400.0f, 300.0f};
        other_turtle.heading = 0.0f;
        other_turtle.pencolor = BLACK;
        other_turtle.penDown = true;
        other_turtle.speed = 1.0f;
        other_turtle.thickness = 1.0f;

        turtle_forward(state, 77);
        dist = turtle_distance_turtle(state, &other_turtle);
        fmt_printf("Distance to other turtle: %f\n", dist);

        drawn = true;
    }
}

int main(void) {
    const int screenWidth = 800;
    const int screenHeight = 600;

    Turtle *state = turtle_create();
    turtle_init_window(screenWidth, screenHeight, "Turtle Distance Example");
    turtle_set_fps(60);
    turtle_set_speed(state, 2.0f);

    turtle_done(state, draw_distance);

    turtle_deallocate(state);
    turtle_close_window();

    return 0;
}

Example 14 : change size of pen also check pen is down or up `turtle_pen_size | turtle_get_pen_size | turtle_is_down`

#include "turtle/turtle.h"
#include "fmt/fmt.h"

void draw_pen(Turtle *state) {
    static bool drawn = false;
    if (!drawn) {
        fmt_printf("current pen size: %f\n", turtle_get_pen_size(state));
        turtle_pen_size(state, 10);
        fmt_printf("new pen size: %f\n", turtle_get_pen_size(state));

        turtle_pen_down(state);
        fmt_printf("is pen down? %s\n", turtle_is_down(state) ? "Yes" : "No");

        turtle_forward(state, 100);
        turtle_right(state, 90);
        turtle_forward(state, 100);

        turtle_pen_up(state);
        fmt_printf("is pen down? %s\n", turtle_is_down(state) ? "Yes" : "No");

        drawn = true;
    }
}

int main(void) {
    const int screenWidth = 800;
    const int screenHeight = 600;

    Turtle *state = turtle_create();
    turtle_init_window(screenWidth, screenHeight, "Turtle Pen Size Example");
    turtle_set_fps(60);
    turtle_set_speed(state, 2.0f);

    turtle_done(state, draw_pen);

    turtle_deallocate(state);
    turtle_close_window();

    return 0;
}

Example 15 : star shape

#include "turtle/turtle.h"
#include "fmt/fmt.h"

void draw_spiral(Turtle *state) {
    static bool drawn = false;

    if (!drawn) {
        float a = 0;
        float b = 0;

        turtle_set_color(state, 255, 0, 0, 255);  
        turtle_pen_up(state);
        turtle_set_position(state, 400, 400);    
        turtle_pen_down(state);

        while (true) {
            turtle_forward(state, a);
            turtle_right(state, b);
        
            a += 3;
            b += 1;
            if (b >= 210) {
                break;
            }
        }

        turtle_pen_up(state);  // Hide the turtle
        drawn = true;
    }
}

int main(void) {
    const int screenWidth = 800;
    const int screenHeight = 600;

    Turtle *state = turtle_create();
    turtle_init_window(screenWidth, screenHeight, "Turtle Spiral Example");
    turtle_set_fps(60);
    turtle_set_speed(state, 2.0f);
    turtle_set_background_color(state, 0, 0, 0, 255);  // black

    turtle_done(state, draw_spiral);

    turtle_deallocate(state);
    turtle_close_window();

    return 0;
}

Example 16 : create colorize shape `Circle spiro graph`

#include "turtle/turtle.h"

void draw_circles(Turtle *state) {
    Color colors[] = {
        {255, 0, 0, 255},      // red
        {0, 0, 255, 255},      // blue
        {255, 0, 255, 255},    // magenta
        {0, 255, 0, 255},      // green
        {255, 255, 0, 255},    // yellow
        {255, 255, 255, 255}   // white
    };

    const int num_colors = sizeof(colors) / sizeof(colors[0]);

    static bool drawn = false;
    if (!drawn) {
        for (int i = 0; i < 6; i++) {
            for (int j = 0; j < num_colors; j++) {
                turtle_set_color(state, colors[j].r, colors[j].g, colors[j].b, colors[j].a);
                turtle_circle(state, 100, 360, 36);
                turtle_left(state, 10);
            }
        }
        drawn = true;
    }
}

int main(void) {
    const int screenWidth = 800;
    const int screenHeight = 600;

    Turtle *state = turtle_create();
    turtle_init_window(screenWidth, screenHeight, "Turtle Circles Example");
    turtle_set_fps(60);
    turtle_set_speed(state, 10.f);
    turtle_set_background_color(state, 0, 0, 0, 255); // black

    turtle_done(state, draw_circles);

    turtle_deallocate(state);
    turtle_close_window();

    return 0;
}

Example 17 : circle

#include "turtle/turtle.h"

void draw_circle(Turtle *state) {
    static bool drawn = false; 
    int n = 10;

    if (!drawn) {
        while (n <= 60) {
            turtle_circle(state, n, 360, 36);  
            n += 10;
        }
        drawn = true; 
    }
}

int main(void) {
    const int screenWidth = 800;
    const int screenHeight = 600;

    Turtle *state = turtle_create();
    turtle_init_window(screenWidth, screenHeight, "Turtle Circle Example");
    turtle_set_fps(60);
    turtle_set_speed(state, 2.0f);

    turtle_done(state, draw_circle);

    turtle_deallocate(state);
    turtle_close_window();

    return 0;
}

Example 18 : Drawing a Spiral Pattern

#include "turtle/turtle.h"
#include <math.h>


void draw_spiral(Turtle *state) {
    static bool drawn = false;

    if (!drawn) {
        for (int i = 0; i < 360; i++) {
            // Set the color based on the angle to create a gradient effect
            int red = (int)(127 * (1 + cos(DEG2RAD * i)));
            int green = (int)(127 * (1 + sin(DEG2RAD * i)));
            int blue = 255 - red;

            turtle_set_color(state, red, green, blue, 255);
            turtle_forward(state, i * 0.5);
            turtle_right(state, 59); 
        }
        drawn = true;
    }
}

int main(void) {
    const int screenWidth = 800;
    const int screenHeight = 600;

    Turtle *state = turtle_create();
    turtle_init_window(screenWidth, screenHeight, "Turtle Spiral Pattern Example");
    turtle_set_fps(60);
    turtle_set_speed(state, 5.0f);

    turtle_done(state, draw_spiral);

    turtle_deallocate(state);
    turtle_close_window();

    return 0;
}

Example 19 : Drawing a flower Pattern

#include "turtle/turtle.h"
#include <math.h>

void draw_petal(Turtle *state, float radius, float angle) {
    for (int i = 0; i < 2; i++) {
        turtle_circle(state, radius, angle, 50);
        turtle_right(state, 180 - angle);
    }
}

void draw_flower(Turtle *state) {
    static bool drawn = false;
    if (!drawn) {
        for (int i = 0; i < 36; i++) {
            // Set the color based on the angle to create a gradient effect
            int red = (int)(127 * (1 + cos(DEG2RAD * i * 10)));
            int green = (int)(127 * (1 + sin(DEG2RAD * i * 10)));
            int blue = 255 - red;

            turtle_set_color(state, red, green, blue, 255);
            draw_petal(state, 50, 60);
            turtle_right(state, 10);
        }
        drawn = true;
    }
}

int main(void) {
    const int screenWidth = 800;
    const int screenHeight = 600;

    Turtle *state = turtle_create();
    turtle_init_window(screenWidth, screenHeight, "Turtle Flower Pattern Example");
    turtle_set_fps(60);
    turtle_set_speed(state, 5.0f);

    turtle_done(state, draw_flower);

    turtle_deallocate(state);
    turtle_close_window();

    return 0;
}

Example 20 : Drawing a hexagonal Spiral

#include "turtle/turtle.h"
#include <math.h>

void draw_hexagonal_spiral(Turtle *state) {
    static bool drawn = false;
    if (!drawn) {
        float length = 10.0f;
        for (int i = 0; i < 100; i++) {
            
            int red = (int)(127 * (1 + cos(DEG2RAD * i * 3.6)));
            int green = (int)(127 * (1 + sin(DEG2RAD * i * 3.6)));
            int blue = 255 - red;

            turtle_set_color(state, red, green, blue, 255);
            turtle_forward(state, length);
            turtle_right(state, 60); 
            length += 2.0f; 
        }
        drawn = true;
    }
}

int main(void) {
    const int screenWidth = 800;
    const int screenHeight = 600;

    Turtle *state = turtle_create();
    turtle_init_window(screenWidth, screenHeight, "Turtle Hexagonal Spiral Example");
    turtle_set_fps(60);
    turtle_set_speed(state, 5.0f);

    turtle_done(state, draw_hexagonal_spiral);

    turtle_deallocate(state);
    turtle_close_window();

    return 0;
}

Example 21 : draw a heart

#include "turtle/turtle.h"
#include <math.h>

void curve(Turtle *state) {
    for (int i = 0; i < 200; i++) {
        turtle_left(state, 1);
        turtle_forward(state, 1);
    }
}

void draw_heart(Turtle *state) {
    static bool drawn = false;
    if (!drawn) {
        turtle_set_speed(state, 3.0f);
        
        turtle_set_color(state, 255, 0, 0, 255);
        turtle_pen_size(state, 5);
        
        turtle_color(state, "#FF0000", "#FFFFFF");
        turtle_begin_fill(state);

        turtle_right(state, 140); 
        turtle_forward(state, 111.65);
        curve(state);
        turtle_right(state, 120);
        curve(state);
        turtle_forward(state, 111.65);
        
        turtle_end_fill(state);
        
        drawn = true;
    }
}

int main(void) {
    const int screenWidth = 800;
    const int screenHeight = 600;

    Turtle *state = turtle_create();
    turtle_init_window(screenWidth, screenHeight, "Turtle Heart Shape Example");
    turtle_set_fps(60);

    turtle_set_background_color(state, 0, 0, 0, 255);
    turtle_done(state, draw_heart);

    turtle_deallocate(state);
    turtle_close_window();

    return 0;
}

Conclusion

This Turtle Graphics library simplifies the process of drawing graphics in C projects, providing an intuitive interface for moving the turtle and drawing shapes and lines. The provided examples illustrate how to use the library for common graphics tasks.

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README.md

Turtle Graphics Library in C

Overview

Key Features

Installation and Compilation

Installing Dependencies

Linux

Windows

Compiling the Turtle Graphics Library

Rebuilding the Project

Documentation

Function Descriptions

Examples

Example 1: Drawing a Star

Example 2: Moving the Turtle

Example 3: Changing the Drawing Color

Example 4: Using Pen Up and Pen Down

Example 5 : Setting the turtle position with `turtle_set_position`

Example 6: turning the turtle left

Example 7 : set x and y with `turtle_set_x | turtle_set_y`

Example 8 : set heading with `turtle_set_heading`

Example 9 : how to send angle to home position with `turtle_home`

Example 10 : how to draw a circle with `turtle_circle`

Example 11 : draw dot with `turtle_dot`

Example 12 : clear stamp

Example 13 : calculate the distance with `turtle_distance | turtle_distance_turtle`

Example 14 : change size of pen also check pen is down or up `turtle_pen_size | turtle_get_pen_size | turtle_is_down`

Example 15 : star shape

Example 16 : create colorize shape `Circle spiro graph`

Example 17 : circle

Example 18 : Drawing a Spiral Pattern

Example 19 : Drawing a flower Pattern

Example 20 : Drawing a hexagonal Spiral

Example 21 : draw a heart

Conclusion

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parent directory

README.md

Turtle Graphics Library in C

Overview

Key Features

Installation and Compilation

Installing Dependencies

Linux

Windows

Compiling the Turtle Graphics Library

Rebuilding the Project

Documentation

Function Descriptions

Examples

Example 1: Drawing a Star

Example 2: Moving the Turtle

Example 3: Changing the Drawing Color

Example 4: Using Pen Up and Pen Down

Example 5 : Setting the turtle position with turtle_set_position

Example 6: turning the turtle left

Example 7 : set x and y with turtle_set_x | turtle_set_y

Example 8 : set heading with turtle_set_heading

Example 9 : how to send angle to home position with turtle_home

Example 10 : how to draw a circle with turtle_circle

Example 11 : draw dot with turtle_dot

Example 12 : clear stamp

Example 13 : calculate the distance with turtle_distance | turtle_distance_turtle

Example 14 : change size of pen also check pen is down or up turtle_pen_size | turtle_get_pen_size | turtle_is_down

Example 15 : star shape

Example 16 : create colorize shape Circle spiro graph

Example 17 : circle

Example 18 : Drawing a Spiral Pattern

Example 19 : Drawing a flower Pattern

Example 20 : Drawing a hexagonal Spiral

Example 21 : draw a heart

Conclusion

Example 5 : Setting the turtle position with `turtle_set_position`

Example 7 : set x and y with `turtle_set_x | turtle_set_y`

Example 8 : set heading with `turtle_set_heading`

Example 9 : how to send angle to home position with `turtle_home`

Example 10 : how to draw a circle with `turtle_circle`

Example 11 : draw dot with `turtle_dot`

Example 13 : calculate the distance with `turtle_distance | turtle_distance_turtle`

Example 14 : change size of pen also check pen is down or up `turtle_pen_size | turtle_get_pen_size | turtle_is_down`

Example 16 : create colorize shape `Circle spiro graph`