Routines
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BDDE: Print Sprites
Used by the routines at DrawFrame 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.
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 BDDE PUSH BC Stash BC, DE and HL on the stack.
BDDF PUSH DE
BDE0 PUSH HL
BDE1 CALL DrawObject_Sprite Call DrawObject_Sprite.
BDE4 POP HL Restore HL, DE and BC from the stack.
BDE5 POP DE
BDE6 POP BC
BDE7 LD A,(IX+$1A) Fetch the pixel x position of the object.
BDEA ADD A,E Add the step along the x axis.
BDEB LD (IX+$1A),A Set the pixel x position of the object.
BDEE LD A,(IX+$1B) Fetch the pixel y position of the object.
BDF1 ADD A,D Add the step along the y axis.
BDF2 LD (IX+$1B),A Set the pixel y position of the object.
BDF5 DJNZ PrintSprites Jump to PrintSprites until all of the sprites have been printed.
BDF7 RET Return.
View the equivalent code in;
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