Resource centre for ZX Spectrum games
using Manic Miner and Jet Set Willy game engines
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Message: 6007
Author: equin0x80
Date: 29/12/2006
Subject: "Speed" of horizontal guardians
Description:
Uploaded by:
File:
The JSW Tech Page doesn't mention any flag in the "horizontal
guardian" block indicating the guardian's speed (i.e. movement "step
size" in pixels per cycle).
When originally testing, I used a four-pixel offset, i.e.
x += movingLeft ? -4 : 4;
but that was just an arbitrary value that looked almost right (though
it made the Abbey monks do a hypnotic jerky dance).
I also noticed that the Bathroom dumbbells were sailing along
constantly instead of rolling on the spot and *then* falling forward,
so I changed my four-pixels-per-frame to 16-pixels-per-animation-loop
(i.e. animate fully on the spot and then move), which still didn't
look right.
JSW Tech Page mentions offset 2 is "reserved" and 4 "not used" in the
horizontal guardian flags, so I tried using either of those as a step
size, but then the guardians just animated on the spot, so those
values always seem to be zero.
Where should I be looking for this horizontal movement value? I
basically want the equivalent of offset 4 in a vertical guardian
block.
Eq.
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