Mercurial > hg > minc-tools
changeset 41:7fc86a297827
*** empty log message ***
| author | david <david> |
|---|---|
| date | Mon, 07 Dec 1992 15:37:41 +0000 |
| parents | 96e209b00691 |
| children | bc733e762cde |
| files | volume_io/Testing/test_graphics.c |
| diffstat | 1 files changed, 80 insertions(+), 47 deletions(-) [+] |
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--- a/volume_io/Testing/test_graphics.c +++ b/volume_io/Testing/test_graphics.c @@ -1,7 +1,10 @@ #include <def_graphics.h> -#define LIGHT_INDEX 0 +#define LIGHT_INDEX 0 + +#define UPDATE_INTERVAL 0.1 +#define MIN_TIME_BETWEEN_EVENT_PROCESSING 0.01 main() { @@ -29,6 +32,10 @@ int current_mouse_x, current_mouse_y; int x_position, y_position, x_size, y_size; Real x, y; + Real time_since_last_events; + Real current_time, end_event_processing, previous_event_time; + Real current_realtime_seconds(); + void sleep_program(); status = G_create_window( "Test Window", -1, -1, -1, -1, &window ); @@ -37,6 +44,7 @@ fill_Point( point, 10.0, 10.0, 0.0 ); status = initialize_text( &text, &point, make_Colour(255,0,255), SIZED_FONT, 14.0 ); + text.string[0] = (char) 0; /* ------------ define line to be drawn ------------- */ @@ -89,66 +97,93 @@ (void) printf( "Hit middle mouse button to exit\n" ); + previous_event_time = -1000.0; + do { - event_type = G_get_event( &event_window, &key_pressed, - &mouse_x, &mouse_y ); + /* to avoid using cpu time to do a busy wait, go to sleep before + processing events */ + + current_time = current_realtime_seconds(); + time_since_last_events = current_time - previous_event_time; - if( event_type != NO_EVENT && event_window == window ) + if( time_since_last_events < MIN_TIME_BETWEEN_EVENT_PROCESSING ) { - switch( event_type ) + sleep_program( MIN_TIME_BETWEEN_EVENT_PROCESSING - + time_since_last_events ); + } + + /* process events for up to UPDATE_INTERVAL seconds */ + + end_event_processing = current_time + UPDATE_INTERVAL; + + do + { + event_type = G_get_event( &event_window, &key_pressed, + &mouse_x, &mouse_y ); + + if( event_window == window ) { - case KEYBOARD_EVENT: - (void) printf( "Key pressed: \"%c\"\n", key_pressed ); - break; - - case LEFT_MOUSE_DOWN_EVENT: - (void) printf( "Left mouse DOWN\n" ); - break; - - case LEFT_MOUSE_UP_EVENT: - (void) printf( "Left mouse UP\n" ); - break; + switch( event_type ) + { + case KEYBOARD_EVENT: + (void) printf( "Key pressed: \"%c\"\n", key_pressed ); + break; - case RIGHT_MOUSE_DOWN_EVENT: - (void) printf( "Right mouse DOWN\n" ); - break; + case LEFT_MOUSE_DOWN_EVENT: + (void) printf( "Left mouse DOWN\n" ); + break; - case RIGHT_MOUSE_UP_EVENT: - (void) printf( "Right mouse UP\n" ); - break; + case LEFT_MOUSE_UP_EVENT: + (void) printf( "Left mouse UP\n" ); + break; + + case RIGHT_MOUSE_DOWN_EVENT: + (void) printf( "Right mouse DOWN\n" ); + break; - case MIDDLE_MOUSE_DOWN_EVENT: - (void) printf( "Middle mouse DOWN\n" ); - done = TRUE; - break; + case RIGHT_MOUSE_UP_EVENT: + (void) printf( "Right mouse UP\n" ); + break; + + case MIDDLE_MOUSE_DOWN_EVENT: + (void) printf( "Middle mouse DOWN\n" ); + done = TRUE; + break; - case MIDDLE_MOUSE_UP_EVENT: - (void) printf( "Middle mouse UP\n" ); - break; + case MIDDLE_MOUSE_UP_EVENT: + (void) printf( "Middle mouse UP\n" ); + break; - case MOUSE_MOVEMENT_EVENT: - current_mouse_x = mouse_x; - current_mouse_y = mouse_y; - G_convert_mouse_pixels_to_0_1( window, + case MOUSE_MOVEMENT_EVENT: + current_mouse_x = mouse_x; + current_mouse_y = mouse_y; + G_convert_mouse_pixels_to_0_1( window, current_mouse_x, current_mouse_y, &x, &y ); - (void) sprintf( text.string, + (void) sprintf( text.string, "Mouse: %4d,%4d pixels %4.2f,%4.2f window", current_mouse_x, current_mouse_y, x, y ); - update_required = TRUE; - break; + update_required = TRUE; + break; - case WINDOW_RESIZE_EVENT: - G_get_window_position( window, &x_position, &y_position ); - G_get_window_size( window, &x_size, &y_size ); - (void) printf( "Window resized, moved, or popped." ); - (void) printf( " New position: %d %d New size: %d %d\n", - x_position, y_position, x_size, y_size ); - update_required = TRUE; - break; + case WINDOW_RESIZE_EVENT: + G_get_window_position( window, &x_position, &y_position ); + G_get_window_size( window, &x_size, &y_size ); + (void) printf( "Window resized, moved, or popped." ); + (void) printf( " New position: %d %d New size: %d %d\n", + x_position, y_position, x_size, y_size ); + update_required = TRUE; + break; + } } } + while( event_type != NO_EVENT && + current_realtime_seconds() < end_event_processing ); + + previous_event_time = current_realtime_seconds(); + + /* if one or more events caused an update, redraw the screen */ if( update_required ) { @@ -167,9 +202,7 @@ } while( !done ); - G_draw_lines( window, &lines ); - G_draw_polygons( window, &polygons ); - G_update_window( window ); + /* delete drawing objects and window (text does not need to be deleted */ status = delete_lines( &lines );