Tutorial 1: Simple Turtle

For this tutorial you need a C project, which is ready for using this library.

In this tutorial we want to use the Simple Turtle and draw a square and a triangle. For working with the Simple Turtle you need the "simpleturtle.h" header file. The Simple Turtle has no structure so it is the same in C and C++. You will only have to use these functions: simpleturtle.h

So lets start and create the new file "tut1.c" in your project:

#include "grubc/turtle/simpleturtle.h"

int main(int argc, char *argv[]) {
   int i = 0;

   /* First initialize the Simple Turtle with the
   path and name of the library jar file, the window name
   and the width and height of the window. */
   initSimpleTurtle("./grubc.jar", "Tutorial 1", 500, 300);

   /* Move away from top left. */
   penUp(); /* Switch drawing off. */
   right(45); /* Turn 45 degrees right. */
   forward(100); /* Move 100 forward. */
   left(45); /* Turn 45 degrees back. */
   penDown(); /* Switch drawing on. */

   setColor(BLUE); /* Set drawing color to blue. */

   /* Draw a square with side length 100. */
   for (i = 0; i <= 3; i++) {
      forward(100); /* Move 100 forward. */
      right(90); /* Turn 90 degrees right. */
   }

   penUp(); /* Switch drawing off. */
   forward(200);/* Move 200 forward. */
   penDown(); /* Switch drawing on. */

   setColor(RED); /* Set drawing color to red. */

   /* Draw an equilateral triangle with side length 100. */
   for (i = 0; i <= 2; i++) {
      forward(100); /* Move 100 forward. */
      right(120); /* Turn 120 degrees right. */
   }

   /* Wait until the user closes the frame. */
   waitForClosingFrame();

   return 0;
}

When you execute this program you will get a window which looks like this:

The Simple Turtle provides more functions. Have look at the documentation simpleturtle.h and test these functions.

---