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example1.c
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1995-02-27
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4KB
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109 lines
/***********************************************************/
/* */
/* Amiga C Encyclopedia (ACE) V3.0 Amiga C Club (ACC) */
/* ------------------------------- ------------------ */
/* */
/* Book: ACM Intuition Amiga C Club */
/* Chapter: Screens Tulevagen 22 */
/* File: Example1.c 181 41 LIDINGO */
/* Author: Anders Bjerin SWEDEN */
/* Date: 92-05-01 */
/* Version: 1.10 */
/* */
/* Copyright 1992, Anders Bjerin - Amiga C Club (ACC) */
/* */
/* Registered members may use this program freely in their */
/* own commercial/noncommercial programs/articles. */
/* */
/***********************************************************/
/* This program will open a low-resolution, non-Interlaced, eight colour */
/* Custom Screen. It will display it for 30 secondes, and then close it. */
/* If your program is using Intuition you should include intuition.h: */
#include <intuition/intuition.h>
struct IntuitionBase *IntuitionBase;
/* Declare a pointer to a Screen structure: */
struct Screen *my_screen;
/* Declare and initialize your NewScreen structure: */
struct NewScreen my_new_screen=
{
0, /* LeftEdge Should always be 0. */
0, /* TopEdge Top of the display.*/
320, /* Width We are using a low-resolution screen. */
200, /* Height Non-Interlaced NTSC (American) display. */
3, /* Depth 8 colours. */
0, /* DetailPen Text should be drawn with colour reg. 0 */
1, /* BlockPen Blocks should be drawn with colour reg. 1 */
NULL, /* ViewModes No special modes. (Low-res, Non-Interlaced) */
CUSTOMSCREEN, /* Type Your own customized screen. */
NULL, /* Font Default font. */
"MY SCREEN", /* Title The screen' title. */
NULL, /* Gadget Must for the moment be NULL. */
NULL /* BitMap No special CustomBitMap. */
};
main()
{
/* Before we can use the functions in the Intuition Library we need */
/* to open it. (See chapter 0 INTRODUCTION for more information.) */
IntuitionBase = (struct IntuitionBase *)
OpenLibrary( "intuition.library", 0 );
if( IntuitionBase == NULL )
exit(); /* Could NOT open the Intuition Library! */
/* We will now try to open the screen: */
my_screen = (struct Screen *) OpenScreen( &my_new_screen );
/* The "(struct Screen *)" is not necessary but it tells the compiler */
/* that the function OpenScreen() returns a pointer to a Screen */
/* structure. (See chapter 0 INTRODUCTION for more information about */
/* casting.) */
/* Have we opened the screen succesfully? */
if(my_screen == NULL)
{
/* Could NOT open the Screen! */
/* Close the Intuition Library since we have opened it: */
CloseLibrary( IntuitionBase );
exit();
}
/* We have opened the screen, and everything seems to be OK. */
/* Wait for 30 seconds: */
Delay( 50 * 30);
/* Delay(time) is a function which stops the process for a while. */
/* "time" is the number of ticks it should wait. (50 ticks per second) */
/* We should always close the screens we have opened before we leave: */
CloseScreen( my_screen );
/* Close the Intuition Library since we have opened it: */
CloseLibrary( IntuitionBase );
/* THE END */
}