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CGraphics

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(C) Graphics

Beginners Guide Graphics in C

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This tutorial is for those who need to work with graphics in C or are interested in graphics.

C itself does not support any graphics library. The only chance people have to use graphichs in C are escape charcters.

You can use escape characters within formatted strings.

/* clearing the screen for graphics output */

printf("\033[2J"); 

The above code works because of the ASCII/ANSI control characters for the terminals. control code to clear the screen is ESC[2J. ESC is having octal value 33 in ASCII Table. so the code to clear the screen will be \033[2J

Example programs

Now i will show some sample program to demonstrate how you can use escape characters.

/* A program to change the video mode from "normal" to "invers" */

int main(int argc, char* argv[])
{
 /* display help text for user */
  if(argc != 2)
   {
      printf("\nUsage: normal,invers");
      exit(1);
   }
 /* set video mode to normal */
  if(strcmp(argv[1],"normal"))
   {
     printf("\033[0m");
     printf("\033[2J");
   }
  /* set video mode to invers */
  else if(strcmp(argv[1],"invers"))
    {
      printf("\033[7m");
      printf("\033[2J");
    }
}

This sample program is straightforward. It checks the argument the user has passed and sets the video mode accordingly.

'Graphics' links

• general
• C++
• C++ Builder
• C++ CLX
• C++ VCL
• Pascal CLX
• Pascal VCL

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