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- /***********************************************************/
- /* */
- /* Amiga C Encyclopedia (ACE) V3.0 Amiga C Club (ACC) */
- /* ------------------------------- ------------------ */
- /* */
- /* Book: ACM Graphics Amiga C Club */
- /* Chapter: LowLevelGraphics Tulevagen 22 */
- /* File: Example4.c 181 41 LIDINGO */
- /* Author: Anders Bjerin SWEDEN */
- /* Date: 92-04-28 */
- /* Version: 1.00 */
- /* */
- /* Copyright 1992, Anders Bjerin - Amiga C Club (ACC) */
- /* */
- /* Registered members may use this program freely in their */
- /* own commercial/noncommercial programs/articles. */
- /* */
- /***********************************************************/
-
- /* This example demonstrates how to open two different ViewPorts on the */
- /* same display. The first ViewPort is in low resolution and use 32 */
- /* colours, while the second ViewPort is in high resolution and only */
- /* use 2 colours. */
-
-
- #include <intuition/intuition.h>
- #include <graphics/gfxbase.h>
-
-
- /* ViewPort 1 */
- #define WIDTH1 320 /* 320 pixels wide. */
- #define HEIGHT1 150 /* 150 lines high. */
- #define DEPTH1 5 /* 5 BitPlanes should be used, gives 32 colours. */
- #define COLOURS1 32 /* 2^5 = 32 */
-
- /* ViewPort 2 */
- #define WIDTH2 640 /* 640 pixels wide. */
- #define HEIGHT2 45 /* 45 lines high. */
- #define DEPTH2 1 /* 1 BitPlanes should be used, gives 2 colours. */
- #define COLOURS2 2 /* 2^1 = 2 */
-
-
- struct IntuitionBase *IntuitionBase;
- struct GfxBase *GfxBase;
-
-
- struct View my_view;
- struct View *my_old_view;
-
-
- /* ViewPort 1 */
- struct ViewPort view_port1;
- struct RasInfo ras_info1;
- struct BitMap bit_map1;
- struct RastPort rast_port1;
- UWORD color_table1[] =
- {
- 0x000, 0xFFF, 0xDDD, 0xBBB, 0x999, 0x777, 0x555, 0x333,
- 0xF00, 0xD00, 0xB00, 0x900, 0x700, 0x500, 0x300, 0x100,
- 0x0F0, 0x0D0, 0x0B0, 0x090, 0x070, 0x050, 0x030, 0x010,
- 0x00F, 0x00D, 0x00B, 0x009, 0x007, 0x005, 0x003, 0x001
- };
-
-
- /* ViewPort 2 */
- struct ViewPort view_port2;
- struct RasInfo ras_info2;
- struct BitMap bit_map2;
- struct RastPort rast_port2;
- UWORD color_table2[] = { 0x000, 0xFFF };
-
-
- void clean_up();
- void main();
-
-
- void main()
- {
- UWORD *pointer;
- int loop;
-
-
-
- /* Open the Intuition library: */
- IntuitionBase = (struct IntuitionBase *)
- OpenLibrary( "intuition.library", 0 );
- if( !IntuitionBase )
- clean_up( "Could NOT open the Intuition library!" );
-
- /* Open the Graphics library: */
- GfxBase = (struct GfxBase *)
- OpenLibrary( "graphics.library", 0 );
- if( !GfxBase )
- clean_up( "Could NOT open the Graphics library!" );
-
-
-
- /* Save the current View, so we can restore it later: */
- my_old_view = GfxBase->ActiView;
-
-
-
- /* 1. Prepare the View structure, and give it a pointer to */
- /* the first ViewPort: */
- InitView( &my_view );
- my_view.ViewPort = &view_port1;
-
-
-
- /* 2. Prepare the ViewPort structures, and set some important values: */
-
- /* ViewPort 1 */
- InitVPort( &view_port1 );
- view_port1.DWidth = WIDTH1; /* Set the width. */
- view_port1.DHeight = HEIGHT1; /* Set the height. */
- view_port1.DxOffset = 0; /* X position. */
- view_port1.DyOffset = 0; /* Y position. */
- view_port1.RasInfo = &ras_info1; /* Give it a pointer to RasInfo. */
- view_port1.Modes = NULL; /* Low resolution. */
- view_port1.Next = &view_port2; /* Pointer to next ViewPort. */
-
- /* ViewPort 2 */
- InitVPort( &view_port2 );
- view_port2.DWidth = WIDTH2; /* Set the width. */
- view_port2.DHeight = HEIGHT2; /* Set the height. */
- view_port2.DxOffset = 0; /* X position. */
- view_port2.DyOffset = HEIGHT1+5; /* Y position (5 lines under). */
- view_port2.RasInfo = &ras_info2; /* Give it a pointer to RasInfo. */
- view_port2.Modes = HIRES; /* High resolution. */
- view_port2.Next = NULL; /* Last ViewPort in the list. */
-
-
-
- /* 3. Get a colour map, link it to the ViewPort, and prepare it: */
-
- /* ViewPort 1 */
- view_port1.ColorMap = (struct ColorMap *) GetColorMap( COLOURS1 );
- if( view_port1.ColorMap == NULL )
- clean_up( "Could NOT get a ColorMap!" );
- /* Get a pointer to the colour map: */
- pointer = (UWORD *) view_port1.ColorMap->ColorTable;
- /* Set the colours: */
- for( loop = 0; loop < COLOURS1; loop++ )
- *pointer++ = color_table1[ loop ];
-
- /* ViewPort 2 */
- view_port2.ColorMap = (struct ColorMap *) GetColorMap( COLOURS2 );
- if( view_port2.ColorMap == NULL )
- clean_up( "Could NOT get a ColorMap!" );
- /* Get a pointer to the colour map: */
- pointer = (UWORD *) view_port2.ColorMap->ColorTable;
- /* Set the colours: */
- for( loop = 0; loop < COLOURS2; loop++ )
- *pointer++ = color_table2[ loop ];
-
-
-
- /* 4. Prepare the BitMap: */
-
- /* ViewPort 1 */
- InitBitMap( &bit_map1, DEPTH1, WIDTH1, HEIGHT1 );
- /* Allocate memory for the Raster: */
- for( loop = 0; loop < DEPTH1; loop++ )
- {
- bit_map1.Planes[ loop ] = (PLANEPTR) AllocRaster( WIDTH1, HEIGHT1 );
- if( bit_map1.Planes[ loop ] == NULL )
- clean_up( "Could NOT allocate enough memory for the raster!" );
- /* Clear the display memory with help of the Blitter: */
- BltClear( bit_map1.Planes[ loop ], RASSIZE( WIDTH1, HEIGHT1 ), 0 );
- }
-
- /* ViewPort 2 */
- InitBitMap( &bit_map2, DEPTH2, WIDTH2, HEIGHT2 );
- /* Allocate memory for the Raster: */
- for( loop = 0; loop < DEPTH2; loop++ )
- {
- bit_map2.Planes[ loop ] = (PLANEPTR) AllocRaster( WIDTH2, HEIGHT2 );
- if( bit_map2.Planes[ loop ] == NULL )
- clean_up( "Could NOT allocate enough memory for the raster!" );
- /* Clear the display memory with help of the Blitter: */
- BltClear( bit_map2.Planes[ loop ], RASSIZE( WIDTH2, HEIGHT2 ), 0 );
- }
-
-
-
- /* 5. Prepare the RasInfo structure: */
-
- /* ViewPort 1 */
- ras_info1.BitMap = &bit_map1; /* Pointer to the BitMap structure. */
- ras_info1.RxOffset = 0; /* The top left corner of the Raster */
- ras_info1.RyOffset = 0; /* should be at the top left corner */
- /* of the display. */
- ras_info1.Next = NULL; /* Single playfield - only one */
- /* RasInfo structure is necessary. */
-
- /* ViewPort 2 */
- ras_info2.BitMap = &bit_map2; /* Pointer to the BitMap structure. */
- ras_info2.RxOffset = 0; /* The top left corner of the Raster */
- ras_info2.RyOffset = 0; /* should be at the top left corner */
- /* of the display. */
- ras_info2.Next = NULL; /* Single playfield - only one */
- /* RasInfo structure is necessary. */
-
-
-
- /* 6. Create the display: */
- MakeVPort( &my_view, &view_port1 ); /* Prepare ViewPort 1 */
- MakeVPort( &my_view, &view_port2 ); /* Prepare ViewPort 2 */
- MrgCop( &my_view );
-
-
-
- /* 7. Prepare the RastPort, and give it a pointer to the BitMap. */
-
- /* ViewPort 1 */
- InitRastPort( &rast_port1 );
- rast_port1.BitMap = &bit_map1;
-
- /* ViewPort 2 */
- InitRastPort( &rast_port2 );
- rast_port2.BitMap = &bit_map2;
-
-
-
- /* 8. Show the new View: */
- LoadView( &my_view );
-
-
-
- /* Set the draw mode to JAM1. FgPen's colour will be used. */
- SetDrMd( &rast_port1, JAM1 );
- SetDrMd( &rast_port2, JAM1 );
-
- /* Set FgPen's colour to 1 (white). */
- SetAPen( &rast_port2, 1 );
- /* Draw some pixels in the second ViewPort: */
- for( loop = 0; loop < 500; loop++ )
- WritePixel( &rast_port2, rand() % WIDTH2, rand() % HEIGHT2 );
-
- /* Print some text into the second ViewPort: */
- Move( &rast_port2, 0, 10 );
- Text( &rast_port2, "This text is written on a single high resolution BitMap. The ViewPort above use ", 80 );
- Move( &rast_port2, 0, 20 );
- Text( &rast_port2, "a 32-colour low resolution BitMap. ", 80 );
-
- /* Draw 10000 pixels in seven different colours, randomly. */
- for( loop = 0; loop < 10000; loop++ )
- {
- /* Set FgPen's colour (1-31, 0 used for the the background). */
- SetAPen( &rast_port1, rand() % (COLOURS1-1) + 1 );
- /* Write a pixel somewere on the display: */
- WritePixel( &rast_port1, rand() % WIDTH1, rand() % HEIGHT1 );
- }
-
-
-
- /* 9. Restore the old View: */
- LoadView( my_old_view );
-
-
- /* Free all allocated resources and leave. */
- clean_up( "THE END" );
- }
-
-
- /* Returns all allocated resources: */
- void clean_up( message )
- STRPTR message;
- {
- int loop;
-
- /* Free automatically allocated display structures: */
- FreeVPortCopLists( &view_port1 );
- FreeVPortCopLists( &view_port2 );
- FreeCprList( my_view.LOFCprList );
-
- /* Deallocate the display memory, BitPlane for BitPlane: */
- for( loop = 0; loop < DEPTH1; loop++ )
- if( bit_map1.Planes[ loop ] )
- FreeRaster( bit_map1.Planes[ loop ], WIDTH1, HEIGHT1 );
- for( loop = 0; loop < DEPTH2; loop++ )
- if( bit_map2.Planes[ loop ] )
- FreeRaster( bit_map2.Planes[ loop ], WIDTH2, HEIGHT2 );
-
- /* Deallocate the ColorMap: */
- if( view_port1.ColorMap ) FreeColorMap( view_port1.ColorMap );
- if( view_port2.ColorMap ) FreeColorMap( view_port2.ColorMap );
-
- /* Close the Graphics library: */
- if( GfxBase ) CloseLibrary( GfxBase );
-
- /* Close the Intuition library: */
- if( IntuitionBase ) CloseLibrary( IntuitionBase );
-
- /* Print the message and leave: */
- printf( "%s\n", message );
- exit();
- }
-