======== Graphics ======== _FAST_ELLIPSE Description : Draws an ellipse using only fixed-point math. Calling format: _FAST_ELLIPSE[XC,YC,RX,RY,_FILLED] XC,YC - center of ellipse RX,RY - X and Y radii (for a circle, RX=RY) _FILLED - whether ellipse should be filled or not Return value : None. Special notes : Requires procedure _4WS (included in file). Author : Michael Sikorsky sikorsky@bode.ee.ualberta.ca _FAST_LINE Description : Draws a line using only fixed-point math. Calling format: _FAST_LINE[X1,Y1,X2,Y2] X1,Y1 - coordinates of the first point X2,Y2 - coordinates of the second point Return value : None. Author : Michael Sikorsky sikorsky@bode.ee.ualberta.ca ===== Icons ===== _MAKEMASK Description : Creates a mask for an icon, using a given colour as "transparent". Calling format: _MAKEMASK[_SCREEN,_COLOUR,TEMP1,TEMP2,X1,Y1,X2,Y2,_ICON] _SCREEN - Screen that icon is displayed on _COLOUR - Colour to make transparent TEMP1,TEMP2 - Two temporary (unused) screens (X1,Y1) - Upper-left corner of icon (X2,Y2) - Lower-right corner of icon _ICON - Icon number to create mask for Return value : None. Special notes : Can be changed to work with bobs instead of icons; just just change "Icon Base" to "Sprite Base". Assumes that the icon exists and has a mask. A typical calling sequence would be: Get Icon N,X1,Y1 To X2,Y2 Make Icon Mask N _MAKEMASK[Screen,_COLOUR,TEMP1,TEMP2,X1,Y1,X2,Y2,N] Author : Michael Sikorsky sikorsky@bode.ee.ualberta.ca ======= Screens ======= _PALETTE_TO_ANTIQUE Description : Converts palette to "antique photograph". Hard to describe; you'll have to see it yourself. Calling format: _PALETTE_TO_ANTIQUE[_SCREEN] _SCREEN - the screen number to affect. Return value : None. Author : Michael Sikorsky sikorsky@bode.ee.ualberta.ca _PALETTE_TO_BW Description : Converts palette to black and white. Calling format: _PALETTE_TO_BW[_SCREEN] _SCREEN - the screen number to affect. Return value : None. Author : Michael Sikorsky sikorsky@bode.ee.ualberta.ca _PALETTE_TO_NEGATIVE Description : Converts palette to "negative" colours (e.g. black<->white) Calling format: _PALETTE_TO_NEGATIVE[_SCREEN] _SCREEN - the screen number to affect. Return value : None. Author : Michael Sikorsky sikorsky@bode.ee.ualberta.ca _SEPARATE_RGB Description : Filters colours in picture. Calling format: _SEPARATE_RGB[_SCREEN,X] _SCREEN - the screen number to affect. X - the "filter" colour: 1 - Red 2 - Green 3 - Blue 4 - Magenta 5 - Yellow 6 - Purple Return value : None. Author : Michael Sikorsky sikorsky@bode.ee.ualberta.ca ====== System ====== _DOSERROR Description : Returns the AmigaDOS error message for an IoErr() error code. Calling format: _DOSERROR[ERR] ERR - IoErr() (Doscall(-132)) return value. Return value : String that contains the error text. Special notes : This procedure handles all errors for AmigaDOS 2.1. Use of the AmigaDOS 2.04 Fault() function is not yet implemented. Author : Andrew Church 95ACHURCH@vax.mbhs.edu ==== Text ==== OPENFONT Description : Opens/closes a font. Calling format: OPENFONT[NAME$,SIZE,_REM] NAME$ - Name of the font. ".font" extension is optional. SIZE - Font size. _REM - 0 to open the font, nonzero to close it. Return value : Font number (to be used with Set Font). Author : Andrew Church 95ACHURCH@vax.mbhs.edu _SHADOW_TXT Description : Writes shadowed text to the current screen. Calling format: _SHADOW_TXT[X,Y,_FG,_BG,_TXT$] X,Y - coordinates for text (like Text command) _FG - foreground colour _BG - background colour _TXT$ - text to write Return value : None. Author : Michael Sikorsky sikorsky@bode.ee.ualberta.ca ===== Other ===== _TO_NTSC Description : Switches display to NTSC mode. Calling format: _TO_PAL Return value : None. Special notes : Requires ECS or better chipset. Author : Michael Sikorsky sikorsky@bode.ee.ualberta.ca _TO_PAL Description : Switches display to PAL mode. Calling format: _TO_PAL Return value : None. Special notes : Requires ECS or better chipset. Author : Michael Sikorsky sikorsky@bode.ee.ualberta.ca