Routines
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BC56: Print Sprites
Used by the routines at DrawPanel and PrintBorder.
Prints the sprite of an object a number of times, moving the pixel position of the object by a step each time, so that it makes a row of sprites. BC, DE and HL are preserved while each sprite is printed.
Input
B Number of times
D Step along the y axis in pixels
E Step along the x axis in pixels
IX The address of the object
Print one sprite and step the position.
PrintSprites BC56 PUSH BC Stash BC, DE and HL on the stack.
BC57 PUSH DE
BC58 PUSH HL
BC59 CALL PrintSprite Call PrintSprite.
BC5C POP HL Restore HL, DE and BC from the stack.
BC5D POP DE
BC5E POP BC
BC5F LD A,(IX+$1A) Fetch the pixel x position of the object.
BC62 ADD A,E Add the step along the x axis.
BC63 LD (IX+$1A),A Set the pixel x position of the object.
BC66 LD A,(IX+$1B) Fetch the pixel y position of the object.
BC69 ADD A,D Add the step along the y axis.
BC6A LD (IX+$1B),A Set the pixel y position of the object.
BC6D DJNZ PrintSprites Jump to PrintSprites until all of the sprites have been printed.
BC6F RET Return.
View the equivalent code in;
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