AMSTRAD cpc 6128 Uživatelský manuál stáhnout pdf (Strana 53)

The Amstrad CPC Firmware Guide

The Graphics VDU

&BBBA GRA INITIALISE

Action Initialises the graphics VDU to its default set-up (ie its set-up when the computer is switched on)

Entry No entry conditions

Exit AF, BC, DE and HL are corrupt, and all other registers are preserved

Notes

Sets the graphics indirections to their defaults, sets the graphic paper to text pen 0 and the graphic pen

to text pen 1, reset the graphics origin and move the graphics cursor to the bottom left of the screen,

reset the graphics window and write mode to their defaults

&BBBD GRA RESET

Action Resets the graphics VDU

Entry No entry conditions

Exit AF, BC, DE and HL are corrupt, and all others are preserved

Notes Resets the graphics indirections and the graphics write mode to their defaults

&BBC0 GRA MOVE ABSOLUTE

Action Moves the graphics cursor to an absolute screen position

Entry DE contains the user X-coordinate and HL holds the user Y-coordinate

Exit AF, BC, DE and HL are corrupt, and all other registers are preserved

&BBC3 GRA MOVE RELATIVE

Action Moves the graphics cursor to a point relative to its present screen position

Entry DE contains the X-distance to move and HL holds the Y-distance

Exit AF, BC, DE and HL are corrupt, and all others are preserved

&BBC6 GRA ASK CURSOR

Action Gets the graphics cursor's current position

Entry No entry conditions

Exit

DE holds the user X-coordirlate, HL holds the user Y-coordinate, AF is corrupt, and all others nre

preserved

&BBC9 GRA SET ORIGIN

Action Sets the graphics user origin's screen position

Entry DE contains the standard X-coordinate and HL holds the standard Y-coordinate

Exit AF, BC, DE and HL are corrupt, and all other registers are preserved

&BBCC GRA GET ORIGIN

Action Gets the graphics user origin's screen position

Entry No entry conditions

Exit

DE contains the standard X-coordinate and HL holds the standard Y-coordinate, and all others are

preserved

&BBCF GRA WIN WIDTH

Action Sets the left and right edges of the graphics window

Entry

DE contains the standard X-coordinate of one edge and HL holds the standard X-coordinate of the

other side

Exit AF, BC, DE and HL are corrupt, and all the other registers are preserved

Notes

The default window covers the entire screen and is restored to its default when the mode is changed;

used in conjunction with GRA WIN HEIGHT

&BBD2 GRA WIN HEIGHT

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