GameLearn006
REM GameLearn006
'Demonstartes creating image surfaces,loading graphics to those pages
'Create a game loop and shows the background
'Show hawk animation, create master hawk X and Y for screen placement
'Create a sub to move the hawk horizontally
'Create a sub to move the hawk vertically
DEFLNG A-Z 'any variable with a name starting with the letters a throught to z are LONG types
CONST True = -1, False = NOT (True) 'constants for logic
Video& = _NEWIMAGE(640, 480, 32) 'screen 12 size 32bit colors
SCREEN Video& 'make this the surface the user sees on monitor
Background& = _LOADIMAGE("Cliffinclouds.bmp") 'create the background page
Graphics& = _LOADIMAGE("Hawk_sprite.bmp") 'create the sprite sheet page
cycle = 0 'variable to indicate the frame of hawk graphic to use
hX = 100: hY = 100
hhdir = 1 'hhdir =hawk direction 1=east , -1=west
hvdir = 1 'hvdir =hawk direction 1=down , -1=up
DO
cycle = cycle + 1 'increment cycle variable
IF cycle >= 3 THEN cycle = 1 'cycle is 1 or 2 , used to indicate which frame of hawk to show
GOSUB MoveHawk
_LIMIT 30 '30 frames per second
_PUTIMAGE , Background&, Video& 'copy the background onto the video page clearing the screen
_CLEARCOLOR 0, Graphics& 'set clearcolor to black(background color on hawk sprite page)
SELECT CASE cycle 'logic branch based on what cycle is
CASE 1
_PUTIMAGE (hX, hY), Graphics&, Video&, (0, 0)-(87, 59) 'copy the hawks over the background
CASE 2
_PUTIMAGE (hX, hY), Graphics&, Video&, (88, 0)-(174, 59) 'copy the hawks over the background
END SELECT
LOCATE 20, 1: PRINT " Note the hawk DESTINATION co-ords are (hX, hY) and hhdir="; hhdir; "hvdir="; hvdir
PRINT "_putimage ("; hX; ","; hY; "),SourcePage,DestinationPage,(SOURCE co-ords)"
PRINT "The source co-ords change,Frame1=(0, 0)-(87, 59),Frame2=(88, 0)-(174, 59) "
_DISPLAY 'update the monitor
LOOP UNTIL _KEYDOWN(27) 'escape key to exit
SLEEP
SYSTEM
MoveHawk:
hX = hX + hhdir 'increment the X every cycle
IF hX >= 630 THEN hX = 630: hhdir = -1 'test collision with right side, toggle hhdir to minus
IF hX <= 10 THEN hX = 10: hhdir = 1 'test collision with left side, toggle hhdir to plus
hY = hY + hvdir
IF hY >= 470 THEN hY = 470: hvdir = -1
IF hY <= 10 THEN hY = 10: hvdir = 1
RETURN